This document discusses cement, including its history, composition, manufacturing process, classifications, strength over time, applications, and forensic analysis. Cement is a binder made from calcareous, siliceous, and other materials that sets and hardens. There are two main manufacturing processes - dry and wet. Cement is classified based on properties like setting time and composition. It is widely used in construction for buildings, transport infrastructure, and water projects. Forensically, cement and other building materials can be analyzed to help reconstruct crimes and trace evidence.
This document discusses paint as forensic evidence. It describes the typical components of paint, including binders, pigments, and solvents. It outlines different types of paints like household and automotive paints. The document then discusses various forensic analysis techniques that can be used to analyze paint evidence like microscopy, spectroscopy, micro-chemical tests, and pyrolysis gas chromatography-mass spectroscopy. It provides an example case study of how paint evidence was used to identify a vehicle involved in a hit and run accident. In conclusion, paint is described as trace evidence that contains information about its components that can be examined using various technical approaches.
Gunshot residue is composed of burnt and unburnt particles from the firearm's primer, propellant, bullet, cartridge case, and firearm. There are three types of gunpowder burning - degressive, neutral, and progressive. Gunshot residue can be detected through analytical methods like neutron activation analysis and atomic absorption spectrophotometry, and qualitatively identified with scanning electron microscopy and atomic force microscopy. Gunshot residue is collected using carbon-coated adhesive stubs or alcohol swabs, with stubs having fewer false negatives. Firing distance can be determined using tests like the Greiss test, which can help identify homicide versus suicide or entrance versus exit wounds. Each gunshot residue case must be individually evaluated as test results alone do
This document discusses the physical examination of tyre marks in forensic investigations. It describes the different types of tyre marks including yaw marks, scrub marks, and skid marks. It outlines the characteristics and identification process for tyre marks, including width, tread pattern, and circumstances. The document explains that tyre marks can be photographed, casted, or examined at a crime scene and provides their forensic significance in helping to identify vehicles and tracing criminal activity.
1) The document discusses sample collection and preservation for forensic toxicology testing. It outlines the types of samples that may be required including blood, urine, stomach contents, and viscera.
2) Guidelines are provided for collecting and preserving samples depending on if the patient is alive or deceased. Proper labeling and containers are emphasized to avoid contamination.
3) Special circumstances that require additional samples are mentioned, such as alcohol poisoning, drug abuse, heavy metals, and criminal abortions. The document provides detailed instructions for collecting, preserving, and transporting different sample types.
Footwear marks provide important evidence at crime scenes. Three types of marks can be left - visible, semi-visible, and latent. Characteristics include class traits from the manufacturing process and individual traits unique to a shoe. Marks are recorded through photography and casting of impressions. Comparison of questioned marks to known shoes examines class and individual traits like tread pattern, wear, and accidental marks. Computer systems can also match images of marks and shoe patterns to aid identification.
The document provides a detailed history of fingerprinting from ancient China and Japan to modern uses by law enforcement. Some key points include:
- Fingerprints have been used for identification in China since at least 300 BC and in Japan by 702 AD.
- Sir William Herschel is credited with beginning the scientific study of fingerprints in India in 1877 and advocating for their use in identification.
- One of the earliest uses of fingerprint evidence to solve a crime was in Argentina in 1892.
- The Henry fingerprint classification system was developed in 1894 and became the standard used by law enforcement.
- In the early 1900s, fingerprint evidence began being admitted in courts and used to solve numerous crimes in
This document discusses cement, including its history, composition, manufacturing process, classifications, strength over time, applications, and forensic analysis. Cement is a binder made from calcareous, siliceous, and other materials that sets and hardens. There are two main manufacturing processes - dry and wet. Cement is classified based on properties like setting time and composition. It is widely used in construction for buildings, transport infrastructure, and water projects. Forensically, cement and other building materials can be analyzed to help reconstruct crimes and trace evidence.
This document discusses paint as forensic evidence. It describes the typical components of paint, including binders, pigments, and solvents. It outlines different types of paints like household and automotive paints. The document then discusses various forensic analysis techniques that can be used to analyze paint evidence like microscopy, spectroscopy, micro-chemical tests, and pyrolysis gas chromatography-mass spectroscopy. It provides an example case study of how paint evidence was used to identify a vehicle involved in a hit and run accident. In conclusion, paint is described as trace evidence that contains information about its components that can be examined using various technical approaches.
Gunshot residue is composed of burnt and unburnt particles from the firearm's primer, propellant, bullet, cartridge case, and firearm. There are three types of gunpowder burning - degressive, neutral, and progressive. Gunshot residue can be detected through analytical methods like neutron activation analysis and atomic absorption spectrophotometry, and qualitatively identified with scanning electron microscopy and atomic force microscopy. Gunshot residue is collected using carbon-coated adhesive stubs or alcohol swabs, with stubs having fewer false negatives. Firing distance can be determined using tests like the Greiss test, which can help identify homicide versus suicide or entrance versus exit wounds. Each gunshot residue case must be individually evaluated as test results alone do
This document discusses the physical examination of tyre marks in forensic investigations. It describes the different types of tyre marks including yaw marks, scrub marks, and skid marks. It outlines the characteristics and identification process for tyre marks, including width, tread pattern, and circumstances. The document explains that tyre marks can be photographed, casted, or examined at a crime scene and provides their forensic significance in helping to identify vehicles and tracing criminal activity.
1) The document discusses sample collection and preservation for forensic toxicology testing. It outlines the types of samples that may be required including blood, urine, stomach contents, and viscera.
2) Guidelines are provided for collecting and preserving samples depending on if the patient is alive or deceased. Proper labeling and containers are emphasized to avoid contamination.
3) Special circumstances that require additional samples are mentioned, such as alcohol poisoning, drug abuse, heavy metals, and criminal abortions. The document provides detailed instructions for collecting, preserving, and transporting different sample types.
Footwear marks provide important evidence at crime scenes. Three types of marks can be left - visible, semi-visible, and latent. Characteristics include class traits from the manufacturing process and individual traits unique to a shoe. Marks are recorded through photography and casting of impressions. Comparison of questioned marks to known shoes examines class and individual traits like tread pattern, wear, and accidental marks. Computer systems can also match images of marks and shoe patterns to aid identification.
The document provides a detailed history of fingerprinting from ancient China and Japan to modern uses by law enforcement. Some key points include:
- Fingerprints have been used for identification in China since at least 300 BC and in Japan by 702 AD.
- Sir William Herschel is credited with beginning the scientific study of fingerprints in India in 1877 and advocating for their use in identification.
- One of the earliest uses of fingerprint evidence to solve a crime was in Argentina in 1892.
- The Henry fingerprint classification system was developed in 1894 and became the standard used by law enforcement.
- In the early 1900s, fingerprint evidence began being admitted in courts and used to solve numerous crimes in
This document provides information on the history and development of fingerprint identification. Some key points:
- Fingerprints first began being used for identification in the late 19th century in India and Argentina. Sir Francis Galton established their individuality and permanence in 1892.
- The Henry Classification System, developed in India in 1897, became the standard fingerprint classification system used in English-speaking countries.
- Fingerprint use began being adopted for criminal identification in the early 20th century, first in England and Wales in 1901 and then in the US starting in the 1900s and growing rapidly in the following decades.
- The FBI began centralizing US fingerprint records and identification efforts in the 1920s, growing their database to
This document discusses the analysis of paint evidence in forensic investigations. It describes the procedures for collection, documentation, and various examination techniques used to analyze and compare paint samples, including visual examination under stereomicroscopes, physical matching of edges, and instrumental methods like Fourier transform infrared spectroscopy, gas chromatography, scanning electron microscopy, and Raman spectroscopy. The analysis of paint evidence can help investigators match a paint chip from a crime scene to a specific vehicle make and model in a hit-and-run case.
Tool marks are impressions left on a softer surface by a tool due to forcible contact. They can be individually unique due to wear and tear on tools. There are four main types of tool marks: compression, striated, combination, and repetitive/multi-stroke marks. Tool marks are examined based on their class, sub-class, and individual characteristics. Proper collection involves photography, tracing, and lifting impressions. A variety of chemical reagents can be used to restore obliterated tool marks on different material surfaces like metals, wood, leather, and rubber.
Distillation is a process used to separate mixtures by heating and cooling. Fractional distillation of crude oil separates it into fractions with different boiling points. This produces useful products like gasoline, kerosene, diesel and lubricating oils. The process involves heating crude oil in a distillation column, where vapors condense at different heights based on boiling point. This separates the mixture into purified fractions.
This document discusses the examination of blood in forensic science. It outlines the key components of blood, including erythrocytes, leukocytes, and platelets. It also describes several preliminary tests that can identify the presence of blood, such as the Kastlemeyer test, LMG test, and luminol test. Two confirmatory tests are also discussed: the Takayama test and Tiechmann's test. The forensic significance of blood evidence is explained, noting how blood can link a victim to a suspect, reveal bloodstain patterns, and allow individualization through DNA profiling.
Confirmatory Test for Semen identificationParth Chuahan
Seminal fluid is a complex mixture of secretions from at least four male urogenital glands. The seminal vesicle gland contributes approximately 60% to this mixture, the prostate gland contributes approximately 30%, and the combined contribution of the epididymis and bulbourethral glands account for the remaining 10%
Confirmatory Tests for semen:
1- The Christmas Tree Stain: The most reliable confirmation for the presence of semen is the positive visual identification of sperm cells (or spermatozoa) using the Christmas tree stain.
This document discusses soil as forensic evidence. It begins by introducing soil as commonly found evidence at crime scenes and transferred between locations. It then describes the components and formation of soil, as well as factors like climate, topography, and organisms that influence soil composition over thousands of years. The document outlines how soil can be collected and examined, such as through microscopic analysis and density gradient tests, to potentially link suspects or objects to crime scenes. Proper collection and preservation of soil samples is also emphasized for successful forensic analysis and investigations.
VSC VIDEO SPECTRAL COMPARATAOR FORENSIC APPLICATIONS BY SHAILESH CHAUBEY STUDENT OF FORENSIC SCIENCE & CRIMINOLOGY FROM BUNDELKHAND UNIVERSITY JHANSI UTTAR PRADESH INDIA . THIS PPT SHOWS ABOUT THE FEATURES, APPLICATIONS , CASE LAWS & NEED OF VSC IN FORENSIC ASPECTS FOR DOCUMENT EXAMINATION & HANDWRITING . THIS PRESENTATION WILL HELP TO GET MORE INFORMATION ABOUT VSC BY VARIOUS SLIDES.
This document discusses the principles and characteristics of handwriting analysis. It explains that while no two people write exactly alike, an individual also has natural variations in their own writing. Class characteristics are similarities seen in groups taught the same writing system, while individual characteristics make each person's handwriting unique. Forensic analysis considers 12 characteristics like line quality, spacing, size consistency, and letter connections to determine if questioned handwriting matches a known sample. The document provides details on each of the 12 characteristics analyzed in handwriting comparison.
Hairs and fibers are important forms of trace evidence that can provide clues in forensic investigations. Hair has a cuticle, cortex, and sometimes a medulla, and characteristics like these can be used to identify a sample's origin. Fiber analysis examines properties such as the fiber's structure, color, and chemical composition to determine its type (natural or synthetic) and match it to a potential source. Due to their tendency to shed easily, fibers are commonly found as trace evidence and can link a suspect to a crime scene or victim.
This document discusses tyre and skid marks which are important evidence in criminal investigations. It describes how tyre impressions and tread patterns can help identify vehicles involved in crimes. Skid marks created when brakes are applied provide information about a vehicle's speed. The length of skid marks depends on factors like vehicle weight, road conditions, tyre condition and braking efficiency. Careful measurement and analysis of tyre and skid marks is important for determining vehicle details and reconstructing criminal events.
This document discusses the history and evolution of standards for the admissibility of expert testimony in U.S. courts. It begins with the 1923 Frye case, which established that expert testimony must be generally accepted in the relevant scientific community. Subsequent cases, including Daubert (1993) and Kumho (1999) refined and expanded the standards, establishing a framework for judges to assess relevance and reliability. Current rules focus on whether the testimony is based on sufficient facts/data and reliable principles/methods.
Soham Bhattacharya's document discusses hair evidence in forensic investigations. It provides background on the history of using hair analysis dating back to the late 1800s. Hair is considered class evidence that cannot identify a specific individual unless the follicle is present for DNA analysis. Hair can persist for long periods on surfaces and clothes due to its tough outer coating and resist decomposition. The recovery of hair evidence can occur at the crime scene or in laboratories.
This document provides information about the analysis of charred documents in 3 sections. It describes the characteristics of charred documents, the methodology for handling, stabilizing, separating, and preserving charred documents. It also discusses photographic and visual decipherment methods to analyze and extract information from charred documents.
This document discusses fingerprints and their identification and analysis in forensic investigations. It provides details on:
- The ridge patterns that make each fingerprint unique and how they are classified into loops, whorls, and arches.
- How latent fingerprints are formed and can be detected using dusting or chemical processing like super glue fuming.
- Basic ridge characteristics like endings, bifurcations, and dots that are used in fingerprint analysis.
- An example of how fingerprints were used to identify students who set up a surprise party through super glue fuming and analysis of their ridge patterns and classifications.
1) Alphonse Bertillon was a French police officer and biometrics researcher born in 1853 who developed the mug shot identification system.
2) As an assistant clerk in the Paris police department in 1879, he realized their criminal records filing system was disorganized and arrestee descriptions were too vague.
3) He proposed classifying criminal records by body measurements like head circumference and height instead of names, which led to his discovery of using mug shots - front and side photographs of arrested individuals - for police identification.
This document discusses forensic ballistics and ammunition. It begins by defining forensic ballistics as the branch of science dealing with shooting incidents for legal purposes. It then discusses different types of ammunition such as rimfire, centerfire, caseless, and blank ammunition. It describes the components of ammunition including primers, propellants, and bullets. Various bullet types are outlined like full metal jacket, hollow point, ballistic tip, open tip, dum-dum, wire patched, rubber, and incendiary bullets. Improvised ammunition is also briefly discussed.
Forensic toxicologists identify and analyze poisons, drugs, and chemicals found in the body to help determine causes of death. They use various tests like chromatography, mass spectrometry, and spectrophotometry to separate and identify unknown chemical compounds in blood and tissue samples. Crime scene technicians can also use field tests to detect chemical residues like accelerants, explosives, drugs, and metals that can provide evidence found at crime scenes or on clothing.
This document provides an overview of fingerprint development and composition. It discusses the different types of fingerprints, including latent prints invisible to the eye, visible prints made with colored substances, and plastic prints made in soft materials. It also outlines the major components of sweat, including water, inorganic ions, proteins, lipids, and amino acids. Fingerprint residue is described as a complex three-dimensional matrix made up of these compounds that can change over time. The document provides background information on fingerprint science concepts for a forensic dermatoglyphics course.
forensic questioned document examinationkiran malik
Power point presentation basically related to document examination in forensic science laboratories, related various facilities and was related to expert evidences.
Forensic trichology uses hair analysis to provide crucial evidence in criminal investigations. Examining the structure, composition, and characteristics of hair can reveal information about a person's identity, drug use, health, and connection to crime scenes. New techniques like DNA testing and microscopic analysis have revolutionized the field by allowing investigators to identify suspects, determine crime details, and strengthen cases. Continued technological advancements both enhance hair examination and present new challenges for forensic trichologists.
This document provides information on the history and development of fingerprint identification. Some key points:
- Fingerprints first began being used for identification in the late 19th century in India and Argentina. Sir Francis Galton established their individuality and permanence in 1892.
- The Henry Classification System, developed in India in 1897, became the standard fingerprint classification system used in English-speaking countries.
- Fingerprint use began being adopted for criminal identification in the early 20th century, first in England and Wales in 1901 and then in the US starting in the 1900s and growing rapidly in the following decades.
- The FBI began centralizing US fingerprint records and identification efforts in the 1920s, growing their database to
This document discusses the analysis of paint evidence in forensic investigations. It describes the procedures for collection, documentation, and various examination techniques used to analyze and compare paint samples, including visual examination under stereomicroscopes, physical matching of edges, and instrumental methods like Fourier transform infrared spectroscopy, gas chromatography, scanning electron microscopy, and Raman spectroscopy. The analysis of paint evidence can help investigators match a paint chip from a crime scene to a specific vehicle make and model in a hit-and-run case.
Tool marks are impressions left on a softer surface by a tool due to forcible contact. They can be individually unique due to wear and tear on tools. There are four main types of tool marks: compression, striated, combination, and repetitive/multi-stroke marks. Tool marks are examined based on their class, sub-class, and individual characteristics. Proper collection involves photography, tracing, and lifting impressions. A variety of chemical reagents can be used to restore obliterated tool marks on different material surfaces like metals, wood, leather, and rubber.
Distillation is a process used to separate mixtures by heating and cooling. Fractional distillation of crude oil separates it into fractions with different boiling points. This produces useful products like gasoline, kerosene, diesel and lubricating oils. The process involves heating crude oil in a distillation column, where vapors condense at different heights based on boiling point. This separates the mixture into purified fractions.
This document discusses the examination of blood in forensic science. It outlines the key components of blood, including erythrocytes, leukocytes, and platelets. It also describes several preliminary tests that can identify the presence of blood, such as the Kastlemeyer test, LMG test, and luminol test. Two confirmatory tests are also discussed: the Takayama test and Tiechmann's test. The forensic significance of blood evidence is explained, noting how blood can link a victim to a suspect, reveal bloodstain patterns, and allow individualization through DNA profiling.
Confirmatory Test for Semen identificationParth Chuahan
Seminal fluid is a complex mixture of secretions from at least four male urogenital glands. The seminal vesicle gland contributes approximately 60% to this mixture, the prostate gland contributes approximately 30%, and the combined contribution of the epididymis and bulbourethral glands account for the remaining 10%
Confirmatory Tests for semen:
1- The Christmas Tree Stain: The most reliable confirmation for the presence of semen is the positive visual identification of sperm cells (or spermatozoa) using the Christmas tree stain.
This document discusses soil as forensic evidence. It begins by introducing soil as commonly found evidence at crime scenes and transferred between locations. It then describes the components and formation of soil, as well as factors like climate, topography, and organisms that influence soil composition over thousands of years. The document outlines how soil can be collected and examined, such as through microscopic analysis and density gradient tests, to potentially link suspects or objects to crime scenes. Proper collection and preservation of soil samples is also emphasized for successful forensic analysis and investigations.
VSC VIDEO SPECTRAL COMPARATAOR FORENSIC APPLICATIONS BY SHAILESH CHAUBEY STUDENT OF FORENSIC SCIENCE & CRIMINOLOGY FROM BUNDELKHAND UNIVERSITY JHANSI UTTAR PRADESH INDIA . THIS PPT SHOWS ABOUT THE FEATURES, APPLICATIONS , CASE LAWS & NEED OF VSC IN FORENSIC ASPECTS FOR DOCUMENT EXAMINATION & HANDWRITING . THIS PRESENTATION WILL HELP TO GET MORE INFORMATION ABOUT VSC BY VARIOUS SLIDES.
This document discusses the principles and characteristics of handwriting analysis. It explains that while no two people write exactly alike, an individual also has natural variations in their own writing. Class characteristics are similarities seen in groups taught the same writing system, while individual characteristics make each person's handwriting unique. Forensic analysis considers 12 characteristics like line quality, spacing, size consistency, and letter connections to determine if questioned handwriting matches a known sample. The document provides details on each of the 12 characteristics analyzed in handwriting comparison.
Hairs and fibers are important forms of trace evidence that can provide clues in forensic investigations. Hair has a cuticle, cortex, and sometimes a medulla, and characteristics like these can be used to identify a sample's origin. Fiber analysis examines properties such as the fiber's structure, color, and chemical composition to determine its type (natural or synthetic) and match it to a potential source. Due to their tendency to shed easily, fibers are commonly found as trace evidence and can link a suspect to a crime scene or victim.
This document discusses tyre and skid marks which are important evidence in criminal investigations. It describes how tyre impressions and tread patterns can help identify vehicles involved in crimes. Skid marks created when brakes are applied provide information about a vehicle's speed. The length of skid marks depends on factors like vehicle weight, road conditions, tyre condition and braking efficiency. Careful measurement and analysis of tyre and skid marks is important for determining vehicle details and reconstructing criminal events.
This document discusses the history and evolution of standards for the admissibility of expert testimony in U.S. courts. It begins with the 1923 Frye case, which established that expert testimony must be generally accepted in the relevant scientific community. Subsequent cases, including Daubert (1993) and Kumho (1999) refined and expanded the standards, establishing a framework for judges to assess relevance and reliability. Current rules focus on whether the testimony is based on sufficient facts/data and reliable principles/methods.
Soham Bhattacharya's document discusses hair evidence in forensic investigations. It provides background on the history of using hair analysis dating back to the late 1800s. Hair is considered class evidence that cannot identify a specific individual unless the follicle is present for DNA analysis. Hair can persist for long periods on surfaces and clothes due to its tough outer coating and resist decomposition. The recovery of hair evidence can occur at the crime scene or in laboratories.
This document provides information about the analysis of charred documents in 3 sections. It describes the characteristics of charred documents, the methodology for handling, stabilizing, separating, and preserving charred documents. It also discusses photographic and visual decipherment methods to analyze and extract information from charred documents.
This document discusses fingerprints and their identification and analysis in forensic investigations. It provides details on:
- The ridge patterns that make each fingerprint unique and how they are classified into loops, whorls, and arches.
- How latent fingerprints are formed and can be detected using dusting or chemical processing like super glue fuming.
- Basic ridge characteristics like endings, bifurcations, and dots that are used in fingerprint analysis.
- An example of how fingerprints were used to identify students who set up a surprise party through super glue fuming and analysis of their ridge patterns and classifications.
1) Alphonse Bertillon was a French police officer and biometrics researcher born in 1853 who developed the mug shot identification system.
2) As an assistant clerk in the Paris police department in 1879, he realized their criminal records filing system was disorganized and arrestee descriptions were too vague.
3) He proposed classifying criminal records by body measurements like head circumference and height instead of names, which led to his discovery of using mug shots - front and side photographs of arrested individuals - for police identification.
This document discusses forensic ballistics and ammunition. It begins by defining forensic ballistics as the branch of science dealing with shooting incidents for legal purposes. It then discusses different types of ammunition such as rimfire, centerfire, caseless, and blank ammunition. It describes the components of ammunition including primers, propellants, and bullets. Various bullet types are outlined like full metal jacket, hollow point, ballistic tip, open tip, dum-dum, wire patched, rubber, and incendiary bullets. Improvised ammunition is also briefly discussed.
Forensic toxicologists identify and analyze poisons, drugs, and chemicals found in the body to help determine causes of death. They use various tests like chromatography, mass spectrometry, and spectrophotometry to separate and identify unknown chemical compounds in blood and tissue samples. Crime scene technicians can also use field tests to detect chemical residues like accelerants, explosives, drugs, and metals that can provide evidence found at crime scenes or on clothing.
This document provides an overview of fingerprint development and composition. It discusses the different types of fingerprints, including latent prints invisible to the eye, visible prints made with colored substances, and plastic prints made in soft materials. It also outlines the major components of sweat, including water, inorganic ions, proteins, lipids, and amino acids. Fingerprint residue is described as a complex three-dimensional matrix made up of these compounds that can change over time. The document provides background information on fingerprint science concepts for a forensic dermatoglyphics course.
forensic questioned document examinationkiran malik
Power point presentation basically related to document examination in forensic science laboratories, related various facilities and was related to expert evidences.
Forensic trichology uses hair analysis to provide crucial evidence in criminal investigations. Examining the structure, composition, and characteristics of hair can reveal information about a person's identity, drug use, health, and connection to crime scenes. New techniques like DNA testing and microscopic analysis have revolutionized the field by allowing investigators to identify suspects, determine crime details, and strengthen cases. Continued technological advancements both enhance hair examination and present new challenges for forensic trichologists.
Gender Discrimination based on the Thermal Signature of the Face and the Exte...sipij
Simple features extracted from the thermal infrared images of the persons' face are proposed for gender
discrimination. Two different types of thermal features are used. The first type is actually based on the
mean value of the pixels of specific locations on the face. All cases of persons from the used database,
males and females, are correctly distinguished based on this feature. Classification results are verified
using two conventional approaches, namely: a. the simplest possible neural network so that generalization
is achieved along with successful discrimination between all persons and b. the leave-one-out approach to
demonstrate the classification performance on unknown persons using the simplest classifiers possible. The
second type takes advantage of the temperature distribution on the ear of the persons. It is found that for
the men the cooler region on the ear is larger as percentage compared to that of the women.
GENDER DISCRIMINATION BASED ON THE THERMAL SIGNATURE OF THE FACE AND THE EXTE...sipij
Simple features extracted from the thermal infrared images of the persons' face are proposed for gender discrimination. Two different types of thermal features are used. The first type is actually based on the mean value of the pixels of specific locations on the face. All cases of persons from the used database, males and females, are correctly distinguished based on this feature. Classification results are verified using two conventional approaches, namely: a. the simplest possible neural network so that generalization is achieved along with successful discrimination between all persons and b. the leave-one-out approach to demonstrate the classification performance on unknown persons using the simplest classifiers possible. The
second type takes advantage of the temperature distribution on the ear of the persons. It is found that for the men the cooler region on the ear is larger as percentage compared to that of the women.
Hair and fibers are common types of trace evidence that can be analyzed forensically. Hair morphology such as color, diameter, cuticle scale pattern, and medulla characteristics can be compared microscopically between known samples and unknown samples. DNA analysis from the hair root or follicle tag can now individualize a human hair. Fibers can be identified as natural, man-made, or synthetic based on their composition and compared through microscopic analysis of features such as color, diameter, surface patterns, and dye. Both hair and fiber evidence require careful collection and preservation for later analysis.
1) The document examines using infrared spectroscopy for rapid intra-operative analysis of human brain tumor tissue to help delineate tumor borders during neurosurgery. Spectra were obtained from excised tissue within minutes after removal and matched with histopathological diagnoses.
2) Preliminary results found differences between tumor and non-tumor tissues may arise from higher RNA levels in freshly excised tumor tissue, which degrades quickly. Additional infrared studies were done on tumor cell lines, mouse brain tissue, and yeast RNA to help interpret the spectral differences.
3) The work highlights the need to acquire infrared spectra within ten minutes of removal and demonstrates the potential of infrared spectroscopy for fast, chemically-based analysis to help guide surgery.
Proteomics is the analysis of the entire protein complement of a cell or organism under defined conditions. It relies on fractionating protein mixtures, mass spectrometry to identify proteins, and bioinformatics. Forensic science applies science to criminal law by analyzing scientific evidence. Proteomics can analyze proteins from samples like hair and teeth to deduce DNA sequences and identify individuals or determine their sex, even from degraded samples where DNA is limited. It has applications in human identification, species identification, and doping analysis from various tissues and biofluids.
Nematodes are elongate, cylindrical, unsegmented worms. In elongate-cylindrical species the
anterior end is usually bluntly rounded with the oral aperture (mouth opening) terminal. The
posterior end may be bluntly rounded or pointed; sometimes it is tapered to a point or it may be long and filiform. Nematode identification is needed for the purposes of understanding nematode diversity, designing efficient management strategies, avoiding spreading of exotic nematodes in quarantine materials. So many methods of nematode identification has been generated over decades. Most of them are based on morphology which is also comes under classical identification techniques, but with the up-gradation of science several methods has been evolved. Among them different techniques has been mentioned here which are mainly based on the molecular tools for identification of the nematodes in a molecular level.
The document summarizes information about analyzing hair and fiber evidence for forensic science investigations. It describes how hair can be identified as human or animal and then compared under microscopes. Key characteristics like cuticle, cortex, medulla and pigmentation are examined. Fiber evidence is also discussed, noting how fiber type, length and fabric construction are analyzed. Both hair and fiber evidence can provide clues but cannot on their own prove the identity of a person.
This study analyzed the differential white blood cell counts and morphometric characteristics of white blood cells and red blood cells from black rats (Rattus rattus) and white rats (Rattus norvegicus). Blood samples were taken from male and female rats of each species. The length and width of white blood cells and their nuclei were measured microscopically. Significant differences were found between species and sexes in the percentages of lymphocyte, monocyte and neutrophil cells, and in the size measurements of various blood cells and nuclei. The results provide data on normal blood cell morphology in these rat species.
This document discusses female hair loss and an evidence-based approach to its diagnosis and management. It outlines four key steps: 1) Make an accurate diagnosis using history, exam findings including smartphone microscopy, and targeted labs; 2) Establish baselines using smartphone photos and hair mass measurement; 3) Choose an appropriate treatment; and 4) Manage treatment using measurable feedback like hair mass index. The diagnosis is usually thinning, shedding or breakage, determined by examining hair diameter, density and breakage patterns. Hair mass measurement provides an objective baseline and tool to monitor progress.
Reseña publicada en la revista de divulgación científica Optics & Photonics Focus en el año 2010, titulada "Forensic Optics: transforming a hair into a travel log".
This document provides a review of topics covered in a forensic science final exam, including:
- Human identification techniques like fingerprints, forensic anthropology, and DNA analysis.
- Trace evidence analysis of hairs, fibers, paint, soil and other materials.
- Tools used by forensic scientists like microscopes, gas chromatographs, mass spectrometers.
- Advanced crime scene topics such as bloodstain pattern analysis and estimating time of death using insect evidence.
- Firearms identification using toolmarks and striations left on bullets and cartridge casings.
It reviews key concepts, terms, techniques, examples and relationships that would be important to understand for the exam.
The Advanced Serology Course is a comprehensive and specialized program designed for professionals in the fields of clinical diagnostics, immunology, and laboratory medicine who seek an in-depth understanding of advanced serological techniques and methodologies. This advanced-level course builds upon foundational knowledge in serology and delves into sophisticated concepts and cutting-edge technologies.
This document provides an overview of bioinformatics and highlights several key points:
- Bioinformatics has emerged as a field to help analyze the vast amounts of biological data being generated through high-throughput technologies. It integrates biology, computer science, and information technology.
- The size of the human genome and rate of data generation has grown exponentially, necessitating computational approaches. International efforts like the Human Genome Project helped sequence the entire human genome.
- Bioinformatics tools and databases are used to study genomics, transcriptomics, proteomics and more to better understand living systems at the molecular level and enable applications in medicine, agriculture, forensics and more. This work also raises ethical, legal and social considerations.
Polymerase Chain Reaction (PCR)-Based Sex Determination Using Unembalmed Huma...IOSR Journals
The strategy developed for sex determination in skeletal remains is to amplify the highly degraded DNA, by use of primers that span short DNA fragments. To determine sex of unembalmed human cadaveric skeletal fragments from Sokoto, North-western Nigeria, using Polymerase Chain Reaction (PCR). A single blind study of Polymerase Chain Reaction (PCR)-based sex determination using amelogenin gene and alphoid repeats primers on unembalmed human cadaveric skeletal fragments from Sokoto, North-western Nigeria, was undertaken. With amelogenin gene, genetic sex identification was achieved in four samples only. PCR Sensitivity = 40%, Specificity = 100%, Predictive value of positive test = 100%, Predictive value of negative test = 25%, False positive rate = 0%, False negative rate = 150%, Efficiency of test = 50%. Fisher’s exact probability test P = 1. Z-test: z-value = -1.0955, p>0.05; not statistically significant. With alphoid repeats primers, correct genetic sex identification was achieved in all the samples. PCR Sensitivity = 100%, Specificity = 0%, Predictive value of positive test = 100%, Predictive value of negative test = 0%, False positive rate = 0%, False negative rate = 0%, Efficiency of test = 100%. Fisher’s exact probability test P = 1. Z-test: z- and p values were invalid. The study, has demonstrated the applicability of PCR method of sex determination in unembalmed human skeletal fragments from Sokoto, Northwestern Nigeria. With amelogenin gene primers, correct genetic sex identification was achieved in four samples only. With alphoid repeats primers, correct genetic sex identification was achieved in all the samples. Therefore, alphoid repeats is more efficient and more reliable than amelogenin gene, in sex determination from unembalmed human skeletal fragments. This is the first known study determining the sex of unembalmed human skeletal fragments by means of PCR in Nigeria. There is need for further studies in Nigeria to complement the findings of this study.
Picturing Science: An overview of Imaging TechnologiesDr. Sima Salahshor
In the past decades imaging technologies are increasingly used to model the dynamics and structure of biological systems. Biomedical imaging is now an integral part of biological and medical sciences and is used in both clinical practice and research. In this session some of the latest imaging technologies were reviewed.
1. Hair shape, texture, and color are influenced by genetics and can be affected by nutrition and treatments. Hair is composed mainly of the protein keratin.
2. Hair grows from follicles, which are fully developed before birth. The body area a hair came from can be determined by its physical characteristics under microscopic examination. Nuclear or mitochondrial DNA from the hair root can be used for analysis.
3. Hairs have three main parts - the cuticle, cortex, and medulla. Differences in these structures can help distinguish between species or potentially identify an individual. Fiber evidence can also provide clues if fibers are transferred between victim and suspect during a crime.
Este estudio sostiene que existen al menos doce genes implicados en el color del pelo y que éstos presentan un total de 45 variaciones diferentes (polimorfismos de un solo nucleótido, SNP por sus siglas en inglés). Otros trabajos han confirmado que algunos genes controlan los diferentes matices, algunos le dan el color, otros el brillo, otros la tonalidad, otros lo hacen más oscuro o más claro, etc.
The document summarizes the structure of hair and the hair growth cycle. It discusses the two main parts of hair structure - the hair root and hair shaft. The hair root contains the hair follicle, bulb, dermal papilla and other structures. The hair shaft has three layers - cuticle, cortex and medulla. It then explains the four phases of the hair growth cycle - anagen, catagen, telogen and exogen. The anagen phase is the growth phase that can last 2-7 years. This is followed by the transitional catagen phase and resting telogen phase, before the old hair sheds in exogen phase. The document also summarizes three research articles on related topics.
Candidate young stellar objects in the S-cluster: Kinematic analysis of a sub...Sérgio Sacani
Context. The observation of several L-band emission sources in the S cluster has led to a rich discussion of their nature. However, a definitive answer to the classification of the dusty objects requires an explanation for the detection of compact Doppler-shifted Brγ emission. The ionized hydrogen in combination with the observation of mid-infrared L-band continuum emission suggests that most of these sources are embedded in a dusty envelope. These embedded sources are part of the S-cluster, and their relationship to the S-stars is still under debate. To date, the question of the origin of these two populations has been vague, although all explanations favor migration processes for the individual cluster members. Aims. This work revisits the S-cluster and its dusty members orbiting the supermassive black hole SgrA* on bound Keplerian orbits from a kinematic perspective. The aim is to explore the Keplerian parameters for patterns that might imply a nonrandom distribution of the sample. Additionally, various analytical aspects are considered to address the nature of the dusty sources. Methods. Based on the photometric analysis, we estimated the individual H−K and K−L colors for the source sample and compared the results to known cluster members. The classification revealed a noticeable contrast between the S-stars and the dusty sources. To fit the flux-density distribution, we utilized the radiative transfer code HYPERION and implemented a young stellar object Class I model. We obtained the position angle from the Keplerian fit results; additionally, we analyzed the distribution of the inclinations and the longitudes of the ascending node. Results. The colors of the dusty sources suggest a stellar nature consistent with the spectral energy distribution in the near and midinfrared domains. Furthermore, the evaporation timescales of dusty and gaseous clumps in the vicinity of SgrA* are much shorter ( 2yr) than the epochs covered by the observations (≈15yr). In addition to the strong evidence for the stellar classification of the D-sources, we also find a clear disk-like pattern following the arrangements of S-stars proposed in the literature. Furthermore, we find a global intrinsic inclination for all dusty sources of 60 ± 20◦, implying a common formation process. Conclusions. The pattern of the dusty sources manifested in the distribution of the position angles, inclinations, and longitudes of the ascending node strongly suggests two different scenarios: the main-sequence stars and the dusty stellar S-cluster sources share a common formation history or migrated with a similar formation channel in the vicinity of SgrA*. Alternatively, the gravitational influence of SgrA* in combination with a massive perturber, such as a putative intermediate mass black hole in the IRS 13 cluster, forces the dusty objects and S-stars to follow a particular orbital arrangement. Key words. stars: black holes– stars: formation– Galaxy: center– galaxies: star formation
Mechanics:- Simple and Compound PendulumPravinHudge1
a compound pendulum is a physical system with a more complex structure than a simple pendulum, incorporating its mass distribution and dimensions into its oscillatory motion around a fixed axis. Understanding its dynamics involves principles of rotational mechanics and the interplay between gravitational potential energy and kinetic energy. Compound pendulums are used in various scientific and engineering applications, such as seismology for measuring earthquakes, in clocks to maintain accurate timekeeping, and in mechanical systems to study oscillatory motion dynamics.
Compositions of iron-meteorite parent bodies constrainthe structure of the pr...Sérgio Sacani
Magmatic iron-meteorite parent bodies are the earliest planetesimals in the Solar System,and they preserve information about conditions and planet-forming processes in thesolar nebula. In this study, we include comprehensive elemental compositions andfractional-crystallization modeling for iron meteorites from the cores of five differenti-ated asteroids from the inner Solar System. Together with previous results of metalliccores from the outer Solar System, we conclude that asteroidal cores from the outerSolar System have smaller sizes, elevated siderophile-element abundances, and simplercrystallization processes than those from the inner Solar System. These differences arerelated to the formation locations of the parent asteroids because the solar protoplane-tary disk varied in redox conditions, elemental distributions, and dynamics at differentheliocentric distances. Using highly siderophile-element data from iron meteorites, wereconstruct the distribution of calcium-aluminum-rich inclusions (CAIs) across theprotoplanetary disk within the first million years of Solar-System history. CAIs, the firstsolids to condense in the Solar System, formed close to the Sun. They were, however,concentrated within the outer disk and depleted within the inner disk. Future modelsof the structure and evolution of the protoplanetary disk should account for this dis-tribution pattern of CAIs.
This presentation offers a general idea of the structure of seed, seed production, management of seeds and its allied technologies. It also offers the concept of gene erosion and the practices used to control it. Nursery and gardening have been widely explored along with their importance in the related domain.
JAMES WEBB STUDY THE MASSIVE BLACK HOLE SEEDSSérgio Sacani
The pathway(s) to seeding the massive black holes (MBHs) that exist at the heart of galaxies in the present and distant Universe remains an unsolved problem. Here we categorise, describe and quantitatively discuss the formation pathways of both light and heavy seeds. We emphasise that the most recent computational models suggest that rather than a bimodal-like mass spectrum between light and heavy seeds with light at one end and heavy at the other that instead a continuum exists. Light seeds being more ubiquitous and the heavier seeds becoming less and less abundant due the rarer environmental conditions required for their formation. We therefore examine the different mechanisms that give rise to different seed mass spectrums. We show how and why the mechanisms that produce the heaviest seeds are also among the rarest events in the Universe and are hence extremely unlikely to be the seeds for the vast majority of the MBH population. We quantify, within the limits of the current large uncertainties in the seeding processes, the expected number densities of the seed mass spectrum. We argue that light seeds must be at least 103 to 105 times more numerous than heavy seeds to explain the MBH population as a whole. Based on our current understanding of the seed population this makes heavy seeds (Mseed > 103 M⊙) a significantly more likely pathway given that heavy seeds have an abundance pattern than is close to and likely in excess of 10−4 compared to light seeds. Finally, we examine the current state-of-the-art in numerical calculations and recent observations and plot a path forward for near-future advances in both domains.
SDSS1335+0728: The awakening of a ∼ 106M⊙ black hole⋆Sérgio Sacani
Context. The early-type galaxy SDSS J133519.91+072807.4 (hereafter SDSS1335+0728), which had exhibited no prior optical variations during the preceding two decades, began showing significant nuclear variability in the Zwicky Transient Facility (ZTF) alert stream from December 2019 (as ZTF19acnskyy). This variability behaviour, coupled with the host-galaxy properties, suggests that SDSS1335+0728 hosts a ∼ 106M⊙ black hole (BH) that is currently in the process of ‘turning on’. Aims. We present a multi-wavelength photometric analysis and spectroscopic follow-up performed with the aim of better understanding the origin of the nuclear variations detected in SDSS1335+0728. Methods. We used archival photometry (from WISE, 2MASS, SDSS, GALEX, eROSITA) and spectroscopic data (from SDSS and LAMOST) to study the state of SDSS1335+0728 prior to December 2019, and new observations from Swift, SOAR/Goodman, VLT/X-shooter, and Keck/LRIS taken after its turn-on to characterise its current state. We analysed the variability of SDSS1335+0728 in the X-ray/UV/optical/mid-infrared range, modelled its spectral energy distribution prior to and after December 2019, and studied the evolution of its UV/optical spectra. Results. From our multi-wavelength photometric analysis, we find that: (a) since 2021, the UV flux (from Swift/UVOT observations) is four times brighter than the flux reported by GALEX in 2004; (b) since June 2022, the mid-infrared flux has risen more than two times, and the W1−W2 WISE colour has become redder; and (c) since February 2024, the source has begun showing X-ray emission. From our spectroscopic follow-up, we see that (i) the narrow emission line ratios are now consistent with a more energetic ionising continuum; (ii) broad emission lines are not detected; and (iii) the [OIII] line increased its flux ∼ 3.6 years after the first ZTF alert, which implies a relatively compact narrow-line-emitting region. Conclusions. We conclude that the variations observed in SDSS1335+0728 could be either explained by a ∼ 106M⊙ AGN that is just turning on or by an exotic tidal disruption event (TDE). If the former is true, SDSS1335+0728 is one of the strongest cases of an AGNobserved in the process of activating. If the latter were found to be the case, it would correspond to the longest and faintest TDE ever observed (or another class of still unknown nuclear transient). Future observations of SDSS1335+0728 are crucial to further understand its behaviour. Key words. galaxies: active– accretion, accretion discs– galaxies: individual: SDSS J133519.91+072807.4
Order : Trombidiformes (Acarina) Class : Arachnida
Mites normally feed on the undersurface of the leaves but the symptoms are more easily seen on the uppersurface.
Tetranychids produce blotching (Spots) on the leaf-surface.
Tarsonemids and Eriophyids produce distortion (twist), puckering (Folds) or stunting (Short) of leaves.
Eriophyids produce distinct galls or blisters (fluid-filled sac in the outer layer)
Sexuality - Issues, Attitude and Behaviour - Applied Social Psychology - Psyc...PsychoTech Services
A proprietary approach developed by bringing together the best of learning theories from Psychology, design principles from the world of visualization, and pedagogical methods from over a decade of training experience, that enables you to: Learn better, faster!
TOPIC OF DISCUSSION: CENTRIFUGATION SLIDESHARE.pptxshubhijain836
Centrifugation is a powerful technique used in laboratories to separate components of a heterogeneous mixture based on their density. This process utilizes centrifugal force to rapidly spin samples, causing denser particles to migrate outward more quickly than lighter ones. As a result, distinct layers form within the sample tube, allowing for easy isolation and purification of target substances.
Anti-Universe And Emergent Gravity and the Dark UniverseSérgio Sacani
Recent theoretical progress indicates that spacetime and gravity emerge together from the entanglement structure of an underlying microscopic theory. These ideas are best understood in Anti-de Sitter space, where they rely on the area law for entanglement entropy. The extension to de Sitter space requires taking into account the entropy and temperature associated with the cosmological horizon. Using insights from string theory, black hole physics and quantum information theory we argue that the positive dark energy leads to a thermal volume law contribution to the entropy that overtakes the area law precisely at the cosmological horizon. Due to the competition between area and volume law entanglement the microscopic de Sitter states do not thermalise at sub-Hubble scales: they exhibit memory effects in the form of an entropy displacement caused by matter. The emergent laws of gravity contain an additional ‘dark’ gravitational force describing the ‘elastic’ response due to the entropy displacement. We derive an estimate of the strength of this extra force in terms of the baryonic mass, Newton’s constant and the Hubble acceleration scale a0 = cH0, and provide evidence for the fact that this additional ‘dark gravity force’ explains the observed phenomena in galaxies and clusters currently attributed to dark matter.
1. PRESENT
APPROACHES
ON
HAIR EXAMINATION
Presented By : Soham Thakur
B.Sc. 4th Sem.
Y151400034
Department of Criminology and Forensic Science
Dr. Hari Singh Gour University,
Sagar (M.P.)
Guided by : Mr. Mrinal Kashyap Sir
Research Scholar
(NET-JRF)
2. OVERVIEW
The presentation will revolve around the following keynotes:
Definition and vitality of hair as evidence,
Headway development in extracting information from
physical , biological & toxicological analysis,
Evolution of instrumentation and techniques in Indian
context.
3. DEFINITION & VITALITY
One of the fine, keratinized filamentous
epidermal growths arising from the
skin of the body of mammals except
the palms, soles, and flexor surfaces of the
joints; the full length and texture of hair
varies markedly in different bodysites.
It is the microscopic and trace evidence.
Hair
Analysis
Reconstruction
of Crime Scene
Age,Sex & Race
determination
Occupational
idea about an
individual
DNA extraction
Fig. Venn Diagram showing relation
between information extracted and hair
analysis.
4. PHYSICAL EXAMINATIONS
Valuable Informations Extracted:
Hair Identification(Age,Sex,Race)
Determination of body area from where it is originated,
Determination of fact that whether hair is forcibly extracted or not
Optical properties of hair
Determination of some disorders or
syndromes.
Fig: Microscopic view of a hair
5. PHYSICAL EXAMINATIONS contd.
INSTRUMENT ADVANTAGES IMAGES OF HAIR
1. Comparison Microscope Comparison of shape, size, colour,
component distribution,
morphological determination
2. Scanning Electron Microscope Analysis of the surface profile of hair,
determination of scale height in
keratin fibres
3. Stereo Microscope Produce 3D images and helps in
determining body area from where
hair is originated
4. Polarized Microscope Pigmentation distribution, cellular
structure of medulla, determination of
disorders, determination of optical
properties
6. BIOLOGICAL EXAMINATIONS
Analysis are done to extract DNA out of hair:
1. With root
2. Without root(from cuticle)
Fig: Automated System for DNA extraction
Vitality:
Determination of paternity
Determination of few genetic
disorders
Fig: Manual Technique for DNA extraction
7. TOXICOLOGICAL EXAMINATIONS
Valuable Information Extracted:
Determinaton of recent past drug use
Examination of long-term drug history through segmental
analysis (i.e. identification and quantification of drugs
along the length of the hair shaft from scalp hair)
Can have reliable information of BMI(Body Mass index)
by analysing the concentration of ethyl glucuronide (EtG)
concentrations in hair
Evaluating risks of acquired clinical vulnerability among
subjects exposed to E-waste.
8. TOXICOLOGICAL EXAMINATIONS contd.
INSTRUMENTS SIGNIFICANCE IMAGES
Liquid Chromatography–
Tandem Mass Spectrometry
Segmental hair analysis
High-Performance Liquid
Chromatography and Capillary
Electrophoresis
Chronic exposure to heroin,
cocaine and/or ecstasy
Time-of-Flight Mass
Spectrometry
determination of drugs of abuse
(morphine, codeine,etc.) and
their metabolites in hair.
9. EVOLUTION IN INDIAN CONTEXT
PHYSICAL EXAMINATION:
Comprison
Microscope
Stereo
Microscope
Electron
Microscope
Optical
Microscope
Fluorescence
Microscopy
Aacoustic
Microscope
TOXICOLOGICAL EXAMINATION:
Liquid Chromatograph–
Mass Spectrometers
Gas
Chromatograph–
Quadrupole Mass
Spectrometer
Magnetic Sector
MS and GC–
Combustion
Isotope MS
Time-of-Flight
Mass
Spectrometers
Fourier Transform
Ion Cyclotron
Resonance Mass
Spectrometers
Fig: Flourescent
Microscope
Fig: FTMS