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.
Alteration is defined as any change to a document which gives it a different effect from
that it originally possessed. If change is made after execution of a document and without
the consent of the other party or concerned person, then such change is called fraudulent
alteration. Document examiners must be able to identify documents that were altered to change the conditions of a contract or other legal entity.
Alterations can take the form of erasures and replacement and/or insertion of material into a document.
Forensic semen analysis plays a vital role in identification of suspected person in rape cases. this slide consist of all the recquiried info. about semen and its analysis in forensic laboratories.
Alteration is defined as any change to a document which gives it a different effect from
that it originally possessed. If change is made after execution of a document and without
the consent of the other party or concerned person, then such change is called fraudulent
alteration. Document examiners must be able to identify documents that were altered to change the conditions of a contract or other legal entity.
Alterations can take the form of erasures and replacement and/or insertion of material into a document.
Forensic semen analysis plays a vital role in identification of suspected person in rape cases. this slide consist of all the recquiried info. about semen and its analysis in forensic laboratories.
This is a ppt on speech recognition system or automated speech recognition system. I hope that it would be helpful for all the people searching for a presentation on this technology
AbstractMammalian hair is structured into various components. T.docxaryan532920
Abstract
Mammalian hair is structured into various components. This paper aims to establish the structural characteristics of mammalian hair. The most basic structure is the medulla, the cortex, and the cuticle. The paper also explores the other substructures of hair among the three main structures. The research paper also includes pictures describing the various structures of hair that have been highlighted herein. The differences in structure between different types of hair has also been captured and real examples of species with those structural variations in morphology provided. The findings of this paper were arrived from the poster project based on the color and thickness of head hair of a Turkish mail and through performing academic research in credible sources of information such as journals. Informative internet websites were also included in the research. Research results from our own group experiment related to biological imaging and other experiments related to mammalian hair observations have also been used in establishing the facts of the paper. Different types of mammalian hair from different species was observed under a microscope and the observations recorded. The paper establishes the structural microscopic differences in the structure human hair from different species of animals such as difference in the medulla and the cuticle. These differences are useful in telling species apart by using microscopic characteristics of hair.
Keywords
Hair shaft, Hair structure, Cortex, Cuticle, Curl pattern, Imbricate scales, coronal scales.
ACKNOWLEDGEMENT
I would like to acknowledge the work of all authors in the various journal articles used for this research. I also acknowledge the Turkish male whose hair was used either directly or indirectly to contribute towards this paper.
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INTRODUCTION
Hair is the slender outgrowth from the skin of most mammals through the skin follicle. A growing hair originates from the papilla and is made up of dead, cornified cells. Basically, hair is made up of a protein called keratin and a black pigment known as melanin which gives color to the skin. It is not uncommon to find trace elements of metals in hair and melanin. Such elements of metals are usually deposited in the hair at the time of growth or they can be absorbed into the hair from external pollutants. Once hair is grown, it goes into telophase or resting stage after which the hair is shed. Mammalian hair from different parts of the body has different structures. This makes it necessary to compare mammalian hair structure from the same place of the body. For example, in an experiment to examine the structure of a mammalian hair, the following procedure can be used;
MATERIALS AND METHODS
Materials
grains of mammalian hair.
Methods
· Place the sample of human hair under a microscope.
· Using a Zeiss Discovery V12 microscope
· Starting with an objective lens of 63x*13.8x observe the specimen then move to 63x*79x
· Record the obse.
Analysis of hair and fiber , differentiating it between human and animals. analysis in identification cases of male and female and different places of body origin. Examination in sexual assault cases and extraction of DNA from hair from DNA fingerprinting.
Essays On Cancer. Cancer essays - Reliable Essay Writers That Deserve Your TrustKimberly Jabbour
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Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
This presentation explores a brief idea about the structural and functional attributes of nucleotides, the structure and function of genetic materials along with the impact of UV rays and pH upon them.
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...University of Maribor
Slides from:
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Track: Artificial Intelligence
https://www.etran.rs/2024/en/home-english/
A brief information about the SCOP protein database used in bioinformatics.
The Structural Classification of Proteins (SCOP) database is a comprehensive and authoritative resource for the structural and evolutionary relationships of proteins. It provides a detailed and curated classification of protein structures, grouping them into families, superfamilies, and folds based on their structural and sequence similarities.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
2. Hair shape (round or oval) and texture (curly or straight) is influenced heavily by
genes. The physical appearance of hair can be affected by nutritional status and
intentional alteration (heat curling, perms, straightening, etc.).
Sources: http://library.thinkquest.org/04oct/00206/lesson.htm#t_hair & http://www.fbi.gov/hq/lab/fsc/backissu/july2000/deedric1.htm#Index%20(Hairs)
Hair is composed of the protein keratin, which is also the primary component of
finger and toe nails.
Hair is produced from a structure called the hair follicle. Humans develop hair
follicles during fetal development, and no new follicles are produced after birth.
Hair color is mostly the result of pigments, which are chemical compounds that
reflect certain wavelengths of visible light.
The body area (head, arm, leg, back, etc.) from which a hair originated can be
determined by the sample’s length, shape, size, color, and other physical
characteristics.
Biology of Hair
In order to test hair evidence for nuclear DNA, the root must be present. The hair
may also be tested using mitochondrial DNA whether or not the root is present.
3. Hair Structure
Hair is composed of three principal parts:
The structure of hair has been compared to that of a pencil with the
medulla being the lead, the cortex being the wood and the cuticle
being the paint on the outside.
http://library.thinkquest.org/04oct/00206/lesson.htm#t_hai
Cuticle – outer coating composed of overlapping scales
Cortex – protein-rich structure around
the medulla that contains pigment
Medulla – central core
(may be absent)
4. Characteristics of the cuticle may be important in distinguishing
between hairs of different species but are often not useful in
distinguishing between different people.
Info: http://library.thinkquest.org/04oct/00206/lesson.htm#t_hair Image: http://www.hairdressersus.com/micro/Image5b.jpg
Hair Structure
Cuticle
The cuticle varies in:
• Its scales,
How many there are per centimeter,
How much they overlap,
Their overall shape, and
How much they protrude from the surface
• Its thickness, and
• Whether or not it contains pigment.
5. Cortex
The cortex varies in:
• Thickness
• Texture
• Color
• Distribution of the cortex is perhaps the most important component
in determining from which individual a human hair may have come.
• Microscopic examination can also reveal the condition and shape of
the root and tip.
Info: http://library.thinkquest.org/04oct/00206/lesson.htm#t_hair Image: http://www.extrapersonality.com/hair.html
Hair Structure
6. Medulla
The medulla may vary in:
• Thickness
• Continuity - one continuous structure
or broken into pieces
• Opacity - how much light is able to
pass through it
• It may also be absent in some species.
http://library.thinkquest.org/04oct/00206/lesson.htm#t_hair
Like the cuticle, the medulla can be important for
distinguishing between hairs of different species, but often
does not lend much important information to the
differentiation between hairs from different people.
Hair Structure
http://www.bfro.net/images/whatis/figures/Fig.%203%20with%20caption.jpg
7. Fiber Evidence
A fiber is the smallest unit of a textile material that has a length many times
greater than its diameter. A fiber can be spun with other fibers to form a yarn that
can be woven or knitted to form a fabric.
The type and length of fiber used, the type of spinning method, and the type of
fabric construction all affect the transfer of fibers and the significance of fiber
associations. This becomes very important when there is a possibility of fiber
transfer between a suspect and a victim during the commission of a crime.
http://www.fbi.gov/hq/lab/fsc/backissu/july2000/deedric3.htm#Fiber%20Evidence
Matching unique fibers on the clothing of a victim to fibers on a suspect’s clothing
can be very helpful to an investigation, whereas the matching of common fibers
such as white cotton or blue denim fibers would be less helpful.
The discovery of cross transfers and multiple fiber transfers between the suspect's
clothing and the victim's clothing dramatically increases the likelihood that these
two individuals had physical contact.
8. Many different natural fibers that come from plants and animals are used in the
production of fabric.
http://www.fireflydiapers.com/articles/diaperarticle_naturalfibersabsorb.htm
Cotton fibers are the plant fibers most commonly used
in textile materials
The animal fiber most frequently used in the
production of textile materials is wool, and the most
common wool fibers originate from sheep.
Natural Fibers
10. It’s time to examine
some hairs and fibers!
http://micro.magnet.fsu.edu/primer/techniques/polarized/gallery/images/humansmall.jpg
11. Directions:
Your team will need to use a microscope
to document all the hairs and fibers in
your set.
Write the name of the hair or fiber on the
line and then draw what you see under
medium or high power. Be sure to
indicate the power of magnification!
Add a description that highlights the
unique characteristics of each hair and
fiber sample.
Pay attention to details to help you
identify samples during the Hair & Fiber
Challenge activity.
Hair & Fiber Identification Lab
12. Can you identify the animal hairs shown?
Think About It …
(1)In which samples are we viewing the cuticle? How do they compare?
(2) In which samples are we viewing the medulla? How do they compare?
(3) What characteristics can be used to identify hair samples?
13. Can you identify the types of fibers shown?
Think About It …
(1)Which samples are natural fibers?
(2) Which samples are synthetic fibers?
(3) What characteristics can be used to identify fiber samples?
15. Types of Animal Hairs - Key
A B C D
E F
G
IH
Cat Horse Pig Human
Deer Dog RatRabbit Human
16. Types of Fibers - Key
Acrylic Yarn Cotton Yarn Nylon Rope
Polyester Yarn Rayon Rope Wool Yarn
Editor's Notes
Teacher Note: I challenge students to identify each hair sample pictured on this slide as they examine the sets of animal hairs I have prepared for them. An observation worksheet is available on my website which requires students to draw an image of what they see and add a description that highlights unique characteristics of each specimen. A key for the animal hairs is available on the next to last slide of this presentation!
Teacher Note: I challenge students to identify each fiber sample pictured on this slide as they examine the sets of fibers I have prepared for them. An observation worksheet is available on my website which requires students to draw an image of what they see and add a description that highlights unique characteristics. A key for the fibers is available on the last slide of this presentation!