This document provides an overview of blotting techniques, including transfer methods, membranes used, and applications of Southern blotting, Northern blotting, and Western blotting. It discusses how blotting involves transferring proteins, DNA, or RNA from a gel onto a membrane. It describes the capillary, electro-blotting, and vacuum blot transfer processes and membranes like nitrocellulose, nylon, and PVDF. It then explains the specific methods and applications of Southern blotting for detecting DNA, Northern blotting for detecting RNA, and Western blotting for detecting proteins.
The document discusses various blotting techniques used to transfer and detect DNA, RNA, and proteins, including Southern blotting, Northern blotting, and Western blotting. Southern blotting was developed by Edwin Southern in 1975 to detect specific DNA sequences and involves transferring DNA from a gel to a membrane. Northern blotting, developed in 1979, detects specific RNA sequences and involves transferring RNA. Western blotting, developed in 1981, detects specific proteins and involves separating proteins by gel electrophoresis, transferring them to a membrane, and using antibodies to detect proteins of interest. These techniques are widely used analytical tools.
The document discusses various blotting techniques used to transfer and detect DNA, RNA, and proteins, including Southern blotting for DNA, Northern blotting for RNA, and Western blotting for proteins. Southern blotting involves separating DNA fragments via gel electrophoresis, transferring them to a membrane, and using a probe to detect specific sequences. It allows researchers to identify genes, map genomes, and study evolution and disease.
This document discusses various blotting techniques used to detect DNA, RNA, and proteins, including Southern blotting, Northern blotting, and Western blotting. It provides detailed descriptions of the procedures for each technique, including separating biomolecules by electrophoresis, transferring them to a membrane, hybridizing probes, and detecting bound probes. The techniques allow visualization and analysis of specific biomolecules within complex samples.
This document discusses various blotting techniques used to detect specific DNA, RNA, and protein molecules. It describes Southern blotting for detecting DNA, Northern blotting for detecting RNA, and Western blotting for detecting proteins. Southern blotting involves separating DNA fragments by gel electrophoresis, transferring them to a membrane, and using a labeled probe for detection. Northern blotting is similar but used for detecting specific RNA sequences. Western blotting uses SDS-PAGE gel electrophoresis to separate proteins, transfers them to a membrane, and detects them using primary and secondary antibodies. These techniques allow detection of specific biomolecules among many contaminants and have various applications in research and diagnostics.
Southern, Northern, and Western blotting techniques allow for the detection of specific DNA, RNA, and protein fragments, respectively. Southern blotting involves separating DNA fragments via gel electrophoresis, transferring them to a membrane, then using a labeled probe for detection via hybridization. Northern blotting is similar but detects RNA. Western blotting separates proteins via gel electrophoresis, transfers them to a membrane, then uses primary and secondary antibodies for detection. These techniques are used for applications like gene mapping and the study of gene expression.
This document describes three types of blotting techniques - Southern blotting, Northern blotting, and Western blotting. Southern blotting is used to detect DNA fragments separated by agarose gel electrophoresis. Northern blotting detects specific RNA sequences separated by gel electrophoresis. Western blotting identifies proteins separated by SDS-PAGE gel using an antibody probe. The document provides detailed procedures and applications for each type of blotting.
This document provides an overview of blotting techniques, including transfer methods, membranes used, and applications of Southern blotting, Northern blotting, and Western blotting. It discusses how blotting involves transferring proteins, DNA, or RNA from a gel onto a membrane. It describes the capillary, electro-blotting, and vacuum blot transfer processes and membranes like nitrocellulose, nylon, and PVDF. It then explains the specific methods and applications of Southern blotting for detecting DNA, Northern blotting for detecting RNA, and Western blotting for detecting proteins.
The document discusses various blotting techniques used to transfer and detect DNA, RNA, and proteins, including Southern blotting, Northern blotting, and Western blotting. Southern blotting was developed by Edwin Southern in 1975 to detect specific DNA sequences and involves transferring DNA from a gel to a membrane. Northern blotting, developed in 1979, detects specific RNA sequences and involves transferring RNA. Western blotting, developed in 1981, detects specific proteins and involves separating proteins by gel electrophoresis, transferring them to a membrane, and using antibodies to detect proteins of interest. These techniques are widely used analytical tools.
The document discusses various blotting techniques used to transfer and detect DNA, RNA, and proteins, including Southern blotting for DNA, Northern blotting for RNA, and Western blotting for proteins. Southern blotting involves separating DNA fragments via gel electrophoresis, transferring them to a membrane, and using a probe to detect specific sequences. It allows researchers to identify genes, map genomes, and study evolution and disease.
This document discusses various blotting techniques used to detect DNA, RNA, and proteins, including Southern blotting, Northern blotting, and Western blotting. It provides detailed descriptions of the procedures for each technique, including separating biomolecules by electrophoresis, transferring them to a membrane, hybridizing probes, and detecting bound probes. The techniques allow visualization and analysis of specific biomolecules within complex samples.
This document discusses various blotting techniques used to detect specific DNA, RNA, and protein molecules. It describes Southern blotting for detecting DNA, Northern blotting for detecting RNA, and Western blotting for detecting proteins. Southern blotting involves separating DNA fragments by gel electrophoresis, transferring them to a membrane, and using a labeled probe for detection. Northern blotting is similar but used for detecting specific RNA sequences. Western blotting uses SDS-PAGE gel electrophoresis to separate proteins, transfers them to a membrane, and detects them using primary and secondary antibodies. These techniques allow detection of specific biomolecules among many contaminants and have various applications in research and diagnostics.
Southern, Northern, and Western blotting techniques allow for the detection of specific DNA, RNA, and protein fragments, respectively. Southern blotting involves separating DNA fragments via gel electrophoresis, transferring them to a membrane, then using a labeled probe for detection via hybridization. Northern blotting is similar but detects RNA. Western blotting separates proteins via gel electrophoresis, transfers them to a membrane, then uses primary and secondary antibodies for detection. These techniques are used for applications like gene mapping and the study of gene expression.
This document describes three types of blotting techniques - Southern blotting, Northern blotting, and Western blotting. Southern blotting is used to detect DNA fragments separated by agarose gel electrophoresis. Northern blotting detects specific RNA sequences separated by gel electrophoresis. Western blotting identifies proteins separated by SDS-PAGE gel using an antibody probe. The document provides detailed procedures and applications for each type of blotting.
The document describes various blotting techniques used to detect DNA, RNA, and proteins. It discusses Southern blotting, which is used to detect specific DNA sequences through separation, transfer, and hybridization. The overall steps involve DNA fragmentation, gel electrophoresis, transfer to a membrane, hybridization with a probe, washing, and detection. Northern blotting is similar but detects RNA and uses formaldehyde during gel electrophoresis. Western blotting detects specific proteins by separating proteins by size on a gel, transferring them to a membrane, labeling with antibodies, washing, and detecting the bound antibodies. These techniques allow for detection of specific biomolecules.
Blotting
A blot, in molecular biology and genetics, is a method of transferring proteins, DNA or RNA, onto a carrier.
The term "blotting" refers to the transfer of biological samples from a gel to a membrane and their subsequent detection on the surface of the membrane.
Types of blotting techniques
Southern Blotting
Northern Blotting
Western Blotting
A Southern blot is a method used
in molecular biology for detection of a specific DNA sequence in DNA samples.
Southern blotting combines transfer of electrophoresis -separated DNA fragments to a filter membrane and subsequent fragment detection by probe hybridization.
The method is named after its inventor, the British biologist Edwin Mellor Southern.
- Methods in Southern blotting
- Advantages and disadvantages
Southern, northern, and western blot protocols are similar, and begin with electrophoretic separation of protein and nucleic acid fragments on a gel, which are then transferred to a membrane (nitrocellulose membrane, polyvinylidene difluoride (PVDF) membrane, etc.) where they are immobilized.
Blotting techniques such as Southern blots, Northern blots, and Western blots can be used to visualize specific DNA, RNA, or proteins separated by electrophoresis. Southern blots involve digesting DNA with restriction enzymes, separating fragments by size via gel electrophoresis, transferring DNA to a membrane, and using probes to detect specific DNA sequences. Northern blots similarly separate RNA before transfer and probing. Western blots separate proteins and use antibodies to detect specific proteins. These techniques allow detection of gene copy numbers as well as deletions, insertions or rearrangements in genes.
Blotting southern,northern, western techniquesveeralxmi
This document describes various blotting techniques used to detect specific nucleic acids or proteins in samples, including Southern blotting, Northern blotting, and Western blotting. It provides an overview of the basic principles and steps involved in each technique, such as separating biomolecules by size, transferring them to a membrane, hybridizing probes, washing unbound probes, and detecting bound probes. The techniques allow researchers to analyze gene expression, detect mutations, and study proteins.
Southern blotting is a hybridization technique for identification of particular size of DNA from the mixture of other similar molecules. This technique is based on the principle of separation of DNA fragments by gel electrophoresis and identified by labelled probe hybridization.
Sequencing genes and genomes in biology. The most important technique available to the molecular biologist is DNA sequencing, by which the precise order of nucleotides in a piece of DNA can be determined
Southern, Northern and Western Blotting methods in genetic EngineeringRavi Raj
This document discusses various blotting techniques including Southern blotting, Northern blotting, and Western blotting. Southern blotting is used to detect DNA, involving digesting genomic DNA, separating fragments by electrophoresis, transferring to a membrane, and detecting with probes. Northern blotting detects RNA, using formaldehyde treatment and RNA probes. Western blotting detects proteins by separating by electrophoresis, transferring to a membrane, and detecting with antibodies. These techniques allow characterization of specific biomolecules in complex mixtures.
Northern blotting is a technique used to detect RNA in a sample. It involves isolating RNA from cells, separating RNA fragments by size using gel electrophoresis, transferring the RNA fragments to a membrane, then using a labeled probe to detect specific RNA sequences through hybridization and visualization. The northern blot allows researchers to study gene expression at the mRNA level and determine which genes are expressed under different conditions or in different tissues.
Nucleic acid hybridization is a technique used to identify specific DNA sequences. It involves denaturing DNA or RNA samples and probes, followed by annealing of the probes to complementary sequences. There are two main types: Southern blotting separates DNA fragments by gel electrophoresis before hybridization with probes, while Northern blotting separates RNA this way. Both techniques allow detection of specific sequences through the use of labeled probes.
Southern blotting and Northern blotting are techniques used to detect specific DNA and RNA sequences. Southern blotting involves transferring DNA fragments separated by gel electrophoresis to a membrane, then using a labeled probe to identify fragments by hybridization. Northern blotting follows similar steps but detects RNA, requiring formaldehyde treatment to denature RNA. Both techniques allow identification of specific molecules in complex mixtures.
Concept: reannealing nucleic acids to identify sequence of interest.
Separates DNA/RNA in an agarose gel, then detects specific bands using probe and hybridization.
Hybridization takes advantage of the ability of a single stranded DNA or RNA molecule to find its complement, even in the presence of large amounts of unrelated DNA.
Allows detection of specific bands (DNA fragments or RNA molecules) that have complementary sequence to the probe.
Size bands and quantify abundance of molecule.
1. Blotting techniques like Southern, Northern, and Western blotting are used to transfer and detect DNA, RNA, and proteins separated by gel electrophoresis.
2. Southern blotting involves transferring DNA fragments to a membrane, then using labeled probes to detect specific DNA sequences through hybridization and autoradiography. It is useful for mapping genes.
3. Northern and Western blotting follow similar procedures to detect RNA and proteins, respectively.
GEL ELECTROPHORESIS WITH BLOT TECHNIQUES.pptxDheeraj Saini
This document provides an overview of gel electrophoresis and blotting techniques. It describes how gel electrophoresis uses a gel matrix to separate macromolecules like DNA, RNA, and proteins based on size and charge when an electric current is applied. The document then discusses different types of gel electrophoresis including agarose gel electrophoresis, polyacrylamide gel electrophoresis, and starch gel electrophoresis. It also summarizes common blotting techniques like Southern blotting for detecting DNA, Northern blotting for detecting RNA, and Western blotting for detecting proteins. The document provides details on the basic principles and procedures for each technique.
Southern blotting is a technique used to detect specific DNA sequences. It involves separating DNA fragments by electrophoresis in an agarose gel, transferring the fragments to a nitrocellulose membrane, and using a radioactive DNA probe to hybridize to complementary DNA sequences on the membrane. The probe-hybridized DNA can then be visualized using autoradiography. Key steps include cleaving DNA with restriction enzymes, gel electrophoresis, transferring DNA from the gel to nitrocellulose via capillary action, fixing the DNA to the membrane by baking, hybridizing with a radioactive probe, and detecting hybridized fragments using autoradiography.
1. Blotting techniques such as Southern, Northern, and Western blotting allow for the transfer of DNA, RNA, and proteins from a gel to a membrane for detection.
2. The Southern blot detects DNA using hybridization with a labeled probe. The Northern blot detects RNA and the Western blot detects proteins using antibodies.
3. These techniques separate biomolecules by size then transfer and detect them on a membrane using probes or antibodies, allowing analysis of complex samples.
Northern blotting is a technique used to detect specific RNA sequences in a sample. It involves separating RNA samples by size through gel electrophoresis, transferring them to a nylon membrane, and using a labeled probe to detect the target RNA sequence through hybridization. The target RNA will be visible as a band on the membrane where the probe has bound. This allows researchers to observe gene expression levels under different conditions like development or disease.
Southern Blotting and Related DNA Detection Techniques MD ASIQUR RAHMAN
The document describes Southern blotting, a technique developed by Edwin Southern in 1975. It involves transferring DNA fragments separated by electrophoresis onto a membrane, where they can be detected through hybridization with labeled probes. Specifically, DNA is extracted, digested with restriction enzymes, separated on a gel, and transferred to a membrane via capillary action. The membrane-bound DNA can then be probed to detect specific fragments through hybridization and visualized. The Southern blot technique allows detection of a targeted DNA fragment against a complex background and has various applications in research, forensics, and medicine.
This document summarizes different blotting techniques used to identify proteins and nucleic acids, including Southern blotting, Northern blotting, and Western blotting. Southern blotting is used to analyze DNA fragments and involves transferring DNA from a gel to a membrane and using a labeled probe. Northern blotting analyzes gene expression by separating RNA, transferring it to a membrane, and using a probe. Western blotting identifies specific proteins by separating proteins via electrophoresis, transferring them to a membrane, and using antibodies to detect the target protein. These techniques are important tools in molecular biology and clinical research.
The document describes various blotting techniques used to detect DNA, RNA, and proteins. It discusses Southern blotting, which is used to detect specific DNA sequences through separation, transfer, and hybridization. The overall steps involve DNA fragmentation, gel electrophoresis, transfer to a membrane, hybridization with a probe, washing, and detection. Northern blotting is similar but detects RNA and uses formaldehyde during gel electrophoresis. Western blotting detects specific proteins by separating proteins by size on a gel, transferring them to a membrane, labeling with antibodies, washing, and detecting the bound antibodies. These techniques allow for detection of specific biomolecules.
Blotting
A blot, in molecular biology and genetics, is a method of transferring proteins, DNA or RNA, onto a carrier.
The term "blotting" refers to the transfer of biological samples from a gel to a membrane and their subsequent detection on the surface of the membrane.
Types of blotting techniques
Southern Blotting
Northern Blotting
Western Blotting
A Southern blot is a method used
in molecular biology for detection of a specific DNA sequence in DNA samples.
Southern blotting combines transfer of electrophoresis -separated DNA fragments to a filter membrane and subsequent fragment detection by probe hybridization.
The method is named after its inventor, the British biologist Edwin Mellor Southern.
- Methods in Southern blotting
- Advantages and disadvantages
Southern, northern, and western blot protocols are similar, and begin with electrophoretic separation of protein and nucleic acid fragments on a gel, which are then transferred to a membrane (nitrocellulose membrane, polyvinylidene difluoride (PVDF) membrane, etc.) where they are immobilized.
Blotting techniques such as Southern blots, Northern blots, and Western blots can be used to visualize specific DNA, RNA, or proteins separated by electrophoresis. Southern blots involve digesting DNA with restriction enzymes, separating fragments by size via gel electrophoresis, transferring DNA to a membrane, and using probes to detect specific DNA sequences. Northern blots similarly separate RNA before transfer and probing. Western blots separate proteins and use antibodies to detect specific proteins. These techniques allow detection of gene copy numbers as well as deletions, insertions or rearrangements in genes.
Blotting southern,northern, western techniquesveeralxmi
This document describes various blotting techniques used to detect specific nucleic acids or proteins in samples, including Southern blotting, Northern blotting, and Western blotting. It provides an overview of the basic principles and steps involved in each technique, such as separating biomolecules by size, transferring them to a membrane, hybridizing probes, washing unbound probes, and detecting bound probes. The techniques allow researchers to analyze gene expression, detect mutations, and study proteins.
Southern blotting is a hybridization technique for identification of particular size of DNA from the mixture of other similar molecules. This technique is based on the principle of separation of DNA fragments by gel electrophoresis and identified by labelled probe hybridization.
Sequencing genes and genomes in biology. The most important technique available to the molecular biologist is DNA sequencing, by which the precise order of nucleotides in a piece of DNA can be determined
Southern, Northern and Western Blotting methods in genetic EngineeringRavi Raj
This document discusses various blotting techniques including Southern blotting, Northern blotting, and Western blotting. Southern blotting is used to detect DNA, involving digesting genomic DNA, separating fragments by electrophoresis, transferring to a membrane, and detecting with probes. Northern blotting detects RNA, using formaldehyde treatment and RNA probes. Western blotting detects proteins by separating by electrophoresis, transferring to a membrane, and detecting with antibodies. These techniques allow characterization of specific biomolecules in complex mixtures.
Northern blotting is a technique used to detect RNA in a sample. It involves isolating RNA from cells, separating RNA fragments by size using gel electrophoresis, transferring the RNA fragments to a membrane, then using a labeled probe to detect specific RNA sequences through hybridization and visualization. The northern blot allows researchers to study gene expression at the mRNA level and determine which genes are expressed under different conditions or in different tissues.
Nucleic acid hybridization is a technique used to identify specific DNA sequences. It involves denaturing DNA or RNA samples and probes, followed by annealing of the probes to complementary sequences. There are two main types: Southern blotting separates DNA fragments by gel electrophoresis before hybridization with probes, while Northern blotting separates RNA this way. Both techniques allow detection of specific sequences through the use of labeled probes.
Southern blotting and Northern blotting are techniques used to detect specific DNA and RNA sequences. Southern blotting involves transferring DNA fragments separated by gel electrophoresis to a membrane, then using a labeled probe to identify fragments by hybridization. Northern blotting follows similar steps but detects RNA, requiring formaldehyde treatment to denature RNA. Both techniques allow identification of specific molecules in complex mixtures.
Concept: reannealing nucleic acids to identify sequence of interest.
Separates DNA/RNA in an agarose gel, then detects specific bands using probe and hybridization.
Hybridization takes advantage of the ability of a single stranded DNA or RNA molecule to find its complement, even in the presence of large amounts of unrelated DNA.
Allows detection of specific bands (DNA fragments or RNA molecules) that have complementary sequence to the probe.
Size bands and quantify abundance of molecule.
1. Blotting techniques like Southern, Northern, and Western blotting are used to transfer and detect DNA, RNA, and proteins separated by gel electrophoresis.
2. Southern blotting involves transferring DNA fragments to a membrane, then using labeled probes to detect specific DNA sequences through hybridization and autoradiography. It is useful for mapping genes.
3. Northern and Western blotting follow similar procedures to detect RNA and proteins, respectively.
GEL ELECTROPHORESIS WITH BLOT TECHNIQUES.pptxDheeraj Saini
This document provides an overview of gel electrophoresis and blotting techniques. It describes how gel electrophoresis uses a gel matrix to separate macromolecules like DNA, RNA, and proteins based on size and charge when an electric current is applied. The document then discusses different types of gel electrophoresis including agarose gel electrophoresis, polyacrylamide gel electrophoresis, and starch gel electrophoresis. It also summarizes common blotting techniques like Southern blotting for detecting DNA, Northern blotting for detecting RNA, and Western blotting for detecting proteins. The document provides details on the basic principles and procedures for each technique.
Southern blotting is a technique used to detect specific DNA sequences. It involves separating DNA fragments by electrophoresis in an agarose gel, transferring the fragments to a nitrocellulose membrane, and using a radioactive DNA probe to hybridize to complementary DNA sequences on the membrane. The probe-hybridized DNA can then be visualized using autoradiography. Key steps include cleaving DNA with restriction enzymes, gel electrophoresis, transferring DNA from the gel to nitrocellulose via capillary action, fixing the DNA to the membrane by baking, hybridizing with a radioactive probe, and detecting hybridized fragments using autoradiography.
1. Blotting techniques such as Southern, Northern, and Western blotting allow for the transfer of DNA, RNA, and proteins from a gel to a membrane for detection.
2. The Southern blot detects DNA using hybridization with a labeled probe. The Northern blot detects RNA and the Western blot detects proteins using antibodies.
3. These techniques separate biomolecules by size then transfer and detect them on a membrane using probes or antibodies, allowing analysis of complex samples.
Northern blotting is a technique used to detect specific RNA sequences in a sample. It involves separating RNA samples by size through gel electrophoresis, transferring them to a nylon membrane, and using a labeled probe to detect the target RNA sequence through hybridization. The target RNA will be visible as a band on the membrane where the probe has bound. This allows researchers to observe gene expression levels under different conditions like development or disease.
Southern Blotting and Related DNA Detection Techniques MD ASIQUR RAHMAN
The document describes Southern blotting, a technique developed by Edwin Southern in 1975. It involves transferring DNA fragments separated by electrophoresis onto a membrane, where they can be detected through hybridization with labeled probes. Specifically, DNA is extracted, digested with restriction enzymes, separated on a gel, and transferred to a membrane via capillary action. The membrane-bound DNA can then be probed to detect specific fragments through hybridization and visualized. The Southern blot technique allows detection of a targeted DNA fragment against a complex background and has various applications in research, forensics, and medicine.
This document summarizes different blotting techniques used to identify proteins and nucleic acids, including Southern blotting, Northern blotting, and Western blotting. Southern blotting is used to analyze DNA fragments and involves transferring DNA from a gel to a membrane and using a labeled probe. Northern blotting analyzes gene expression by separating RNA, transferring it to a membrane, and using a probe. Western blotting identifies specific proteins by separating proteins via electrophoresis, transferring them to a membrane, and using antibodies to detect the target protein. These techniques are important tools in molecular biology and clinical research.
Similar to lec 7 - blotting + multiplex pcr biochemistry..pptx (20)
CLASS 12th CHEMISTRY SOLID STATE ppt (Animated)eitps1506
Description:
Dive into the fascinating realm of solid-state physics with our meticulously crafted online PowerPoint presentation. This immersive educational resource offers a comprehensive exploration of the fundamental concepts, theories, and applications within the realm of solid-state physics.
From crystalline structures to semiconductor devices, this presentation delves into the intricate principles governing the behavior of solids, providing clear explanations and illustrative examples to enhance understanding. Whether you're a student delving into the subject for the first time or a seasoned researcher seeking to deepen your knowledge, our presentation offers valuable insights and in-depth analyses to cater to various levels of expertise.
Key topics covered include:
Crystal Structures: Unravel the mysteries of crystalline arrangements and their significance in determining material properties.
Band Theory: Explore the electronic band structure of solids and understand how it influences their conductive properties.
Semiconductor Physics: Delve into the behavior of semiconductors, including doping, carrier transport, and device applications.
Magnetic Properties: Investigate the magnetic behavior of solids, including ferromagnetism, antiferromagnetism, and ferrimagnetism.
Optical Properties: Examine the interaction of light with solids, including absorption, reflection, and transmission phenomena.
With visually engaging slides, informative content, and interactive elements, our online PowerPoint presentation serves as a valuable resource for students, educators, and enthusiasts alike, facilitating a deeper understanding of the captivating world of solid-state physics. Explore the intricacies of solid-state materials and unlock the secrets behind their remarkable properties with our comprehensive presentation.
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.
Microbial interaction
Microorganisms interacts with each other and can be physically associated with another organisms in a variety of ways.
One organism can be located on the surface of another organism as an ectobiont or located within another organism as endobiont.
Microbial interaction may be positive such as mutualism, proto-cooperation, commensalism or may be negative such as parasitism, predation or competition
Types of microbial interaction
Positive interaction: mutualism, proto-cooperation, commensalism
Negative interaction: Ammensalism (antagonism), parasitism, predation, competition
I. Mutualism:
It is defined as the relationship in which each organism in interaction gets benefits from association. It is an obligatory relationship in which mutualist and host are metabolically dependent on each other.
Mutualistic relationship is very specific where one member of association cannot be replaced by another species.
Mutualism require close physical contact between interacting organisms.
Relationship of mutualism allows organisms to exist in habitat that could not occupied by either species alone.
Mutualistic relationship between organisms allows them to act as a single organism.
Examples of mutualism:
i. Lichens:
Lichens are excellent example of mutualism.
They are the association of specific fungi and certain genus of algae. In lichen, fungal partner is called mycobiont and algal partner is called
II. Syntrophism:
It is an association in which the growth of one organism either depends on or improved by the substrate provided by another organism.
In syntrophism both organism in association gets benefits.
Compound A
Utilized by population 1
Compound B
Utilized by population 2
Compound C
utilized by both Population 1+2
Products
In this theoretical example of syntrophism, population 1 is able to utilize and metabolize compound A, forming compound B but cannot metabolize beyond compound B without co-operation of population 2. Population 2is unable to utilize compound A but it can metabolize compound B forming compound C. Then both population 1 and 2 are able to carry out metabolic reaction which leads to formation of end product that neither population could produce alone.
Examples of syntrophism:
i. Methanogenic ecosystem in sludge digester
Methane produced by methanogenic bacteria depends upon interspecies hydrogen transfer by other fermentative bacteria.
Anaerobic fermentative bacteria generate CO2 and H2 utilizing carbohydrates which is then utilized by methanogenic bacteria (Methanobacter) to produce methane.
ii. Lactobacillus arobinosus and Enterococcus faecalis:
In the minimal media, Lactobacillus arobinosus and Enterococcus faecalis are able to grow together but not alone.
The synergistic relationship between E. faecalis and L. arobinosus occurs in which E. faecalis require folic acid
Travis Hills of MN is Making Clean Water Accessible to All Through High Flux ...Travis Hills MN
By harnessing the power of High Flux Vacuum Membrane Distillation, Travis Hills from MN envisions a future where clean and safe drinking water is accessible to all, regardless of geographical location or economic status.
Authoring a personal GPT for your research and practice: How we created the Q...Leonel Morgado
Thematic analysis in qualitative research is a time-consuming and systematic task, typically done using teams. Team members must ground their activities on common understandings of the major concepts underlying the thematic analysis, and define criteria for its development. However, conceptual misunderstandings, equivocations, and lack of adherence to criteria are challenges to the quality and speed of this process. Given the distributed and uncertain nature of this process, we wondered if the tasks in thematic analysis could be supported by readily available artificial intelligence chatbots. Our early efforts point to potential benefits: not just saving time in the coding process but better adherence to criteria and grounding, by increasing triangulation between humans and artificial intelligence. This tutorial will provide a description and demonstration of the process we followed, as two academic researchers, to develop a custom ChatGPT to assist with qualitative coding in the thematic data analysis process of immersive learning accounts in a survey of the academic literature: QUAL-E Immersive Learning Thematic Analysis Helper. In the hands-on time, participants will try out QUAL-E and develop their ideas for their own qualitative coding ChatGPT. Participants that have the paid ChatGPT Plus subscription can create a draft of their assistants. The organizers will provide course materials and slide deck that participants will be able to utilize to continue development of their custom GPT. The paid subscription to ChatGPT Plus is not required to participate in this workshop, just for trying out personal GPTs during it.
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!
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...Sérgio Sacani
Context. With a mass exceeding several 104 M⊙ and a rich and dense population of massive stars, supermassive young star clusters
represent the most massive star-forming environment that is dominated by the feedback from massive stars and gravitational interactions
among stars.
Aims. In this paper we present the Extended Westerlund 1 and 2 Open Clusters Survey (EWOCS) project, which aims to investigate
the influence of the starburst environment on the formation of stars and planets, and on the evolution of both low and high mass stars.
The primary targets of this project are Westerlund 1 and 2, the closest supermassive star clusters to the Sun.
Methods. The project is based primarily on recent observations conducted with the Chandra and JWST observatories. Specifically,
the Chandra survey of Westerlund 1 consists of 36 new ACIS-I observations, nearly co-pointed, for a total exposure time of 1 Msec.
Additionally, we included 8 archival Chandra/ACIS-S observations. This paper presents the resulting catalog of X-ray sources within
and around Westerlund 1. Sources were detected by combining various existing methods, and photon extraction and source validation
were carried out using the ACIS-Extract software.
Results. The EWOCS X-ray catalog comprises 5963 validated sources out of the 9420 initially provided to ACIS-Extract, reaching a
photon flux threshold of approximately 2 × 10−8 photons cm−2
s
−1
. The X-ray sources exhibit a highly concentrated spatial distribution,
with 1075 sources located within the central 1 arcmin. We have successfully detected X-ray emissions from 126 out of the 166 known
massive stars of the cluster, and we have collected over 71 000 photons from the magnetar CXO J164710.20-455217.
PPT on Direct Seeded Rice presented at the three-day 'Training and Validation Workshop on Modules of Climate Smart Agriculture (CSA) Technologies in South Asia' workshop on April 22, 2024.
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
When I was asked to give a companion lecture in support of ‘The Philosophy of Science’ (https://shorturl.at/4pUXz) I decided not to walk through the detail of the many methodologies in order of use. Instead, I chose to employ a long standing, and ongoing, scientific development as an exemplar. And so, I chose the ever evolving story of Thermodynamics as a scientific investigation at its best.
Conducted over a period of >200 years, Thermodynamics R&D, and application, benefitted from the highest levels of professionalism, collaboration, and technical thoroughness. New layers of application, methodology, and practice were made possible by the progressive advance of technology. In turn, this has seen measurement and modelling accuracy continually improved at a micro and macro level.
Perhaps most importantly, Thermodynamics rapidly became a primary tool in the advance of applied science/engineering/technology, spanning micro-tech, to aerospace and cosmology. I can think of no better a story to illustrate the breadth of scientific methodologies and applications at their best.
Evidence of Jet Activity from the Secondary Black Hole in the OJ 287 Binary S...Sérgio Sacani
Wereport the study of a huge optical intraday flare on 2021 November 12 at 2 a.m. UT in the blazar OJ287. In the binary black hole model, it is associated with an impact of the secondary black hole on the accretion disk of the primary. Our multifrequency observing campaign was set up to search for such a signature of the impact based on a prediction made 8 yr earlier. The first I-band results of the flare have already been reported by Kishore et al. (2024). Here we combine these data with our monitoring in the R-band. There is a big change in the R–I spectral index by 1.0 ±0.1 between the normal background and the flare, suggesting a new component of radiation. The polarization variation during the rise of the flare suggests the same. The limits on the source size place it most reasonably in the jet of the secondary BH. We then ask why we have not seen this phenomenon before. We show that OJ287 was never before observed with sufficient sensitivity on the night when the flare should have happened according to the binary model. We also study the probability that this flare is just an oversized example of intraday variability using the Krakow data set of intense monitoring between 2015 and 2023. We find that the occurrence of a flare of this size and rapidity is unlikely. In machine-readable Tables 1 and 2, we give the full orbit-linked historical light curve of OJ287 as well as the dense monitoring sample of Krakow.
2. Advantages:
• This technique has the potential to produce
considerable savings in time and effort within the
laboratory
Disadvantages:
• Optimization is difficult; since many sets of
forward and reverse primers are to be designed
for use.
• Increases cost.
• Presence of multiple primer may lead to cross
hybridization with each other and the possibility
of mis-priming with other templates.
3.
4. Annealing temperatures for each of the primer
sets must be optimized to work correctly within a
single reaction, and amplicon sizes, i.e., their base
pair length, should be different enough to form
distinct bands when visualized by gel
electrophoresis. Alternatively, if amplicon sizes
overlap, the different amplicons may be
differentiated and visualised using primers that
have been dyed with different colour fluorescent
dyes.
10. Nitrocellulose membranes are a popular
matrix used in protein blotting because of
their high protein-binding affinity,
compatibility with a variety of detection
methods (chemiluminescence, chromogenic,
and fluorescence), and the ability to
immobilize proteins, glycoproteins, or nucleic
acids.
15. Method
- Restriction endonucleases are used to cut high-
molecular-weight DNA strands into smaller
fragments.
- The DNA fragments are then electrophoresed on
an agarose gel to separate them by size.
- The DNA gel is placed into an alkaline solution
(typically containing sodium hydroxide) to denature
the double-stranded DNA. The denaturation in an
alkaline environment may improve binding of the
negatively charged thymine residues of DNA to a
positively charged amino groups of membrane,
separating it into single DNA strands for
later hybridization to the probe, and destroys any
residual RNA that may still be present in the DNA.
16. - A sheet of nitrocellulose (or,
alternatively, nylon) membrane is placed on top of
the gel. Pressure is applied evenly to the gel by
placing a stack of paper towels and a weight on top of
the membrane and gel, to ensure good and even
contact between gel and membrane. Buffer transfer
by capillary action from a region of high water
potential to a region of low water potential (usually
filter paper and paper tissues) is then used to move
the DNA from the gel onto the membrane. the DNA
binds to the membrane due to the negative charge of
the DNA and positive charge of the membrane.
- The membrane is then baked in a vacuum or regular
oven at 80 °C for 2 hours (standard conditions;
nitrocellulose or nylon membrane) to permanently
attach the transferred DNA to the membrane.
17. - The membrane is then exposed to a hybridization
probe—a single DNA fragment with a specific
sequence. The probe DNA is labelled so that it can
be detected, usually by
incorporating radioactivity or tagging the
molecule with a fluorescent dye.
- After hybridization, excess probe is washed from
the membrane, and the pattern of hybridization is
visualized on X-ray film by autoradiography in the
case of a radioactive or fluorescent probe.
21. Western blotting or immunoblotting
A technique in which proteins are separated by
gel electrophoresis and transferred to a
membrane sheet. A specific protein is then
identified through its reaction with a labeled
antibody.
22. PROCEDURE
- The proteins of the sample are separated using gel
electrophoresis (PAGE, Poly Acrylamide Gel
Electrophoresis) and are then transferred onto nitro
cellulose to which they bind.
- Then radiolabelled specific antibody is added on such
membrane and it binds only to specific complementary
protein.
- The antibody is labelled with iodine-125 and the
signal is detected again with autoradiography.
-If radio active label is not used, bound antibody may
be detected by a second antibody tagged with an
enzyme, which allows to visualize the protein-Ab1-
Ab2 complex.