Technique combining ideas of isoelectric points and electric fields. It gives good separation with a high resolution compared to any other method. Proteins are separated in a pH gradient according to their isoelectric points, with proteins migrating towards the cathode or anode depending on whether their pI is below or above the pH at that point in the gradient. Applications include separation and identification of serum proteins in clinical settings and separation of proteins, enzymes, and other biomolecules in research.
Isoelectric focusing electrophoresis- Principle , procedure and applicationsJaskiranKaur72
IEF separates amphoteric compounds, such as proteins, with increased resolution in a medium possessing a stable pH gradient. The protein becomes “focused” at a point on the gel as it migrates to a zone where the pH of the gel matches the protein's pI. At this point, the charge of the protein becomes zero and its migration ceases.
Gel electrophoresis native, denaturing&reducingLovnish Thakur
Electrophoresis is a technique used to separate and sometimes purify macromolecules - especially proteins and nucleic acids - that differ in size, charge or conformation.
Isoelectric focusing electrophoresis- Principle , procedure and applicationsJaskiranKaur72
IEF separates amphoteric compounds, such as proteins, with increased resolution in a medium possessing a stable pH gradient. The protein becomes “focused” at a point on the gel as it migrates to a zone where the pH of the gel matches the protein's pI. At this point, the charge of the protein becomes zero and its migration ceases.
Gel electrophoresis native, denaturing&reducingLovnish Thakur
Electrophoresis is a technique used to separate and sometimes purify macromolecules - especially proteins and nucleic acids - that differ in size, charge or conformation.
Introduction, Principle, Instrumentation and Applications of SDS-PAGEMohammed Mubeen
The following presentation contains helpful information regarding SDS-PAGE, including the history, introduction, principle, instrumentation, advantages and applications of SDS-PAGE.
It is an important tool in biochemical research. Which through rapid spinning imposes high centrifugal forces on suspended particles, or even molecules in solution, and causes separations of such matter on the basis of differences in weight.
It is a subtype of the gel electrophoresis whereby the normal gel is replaced with polyacrylamide gels used as support media.
Gels are made by free radical-induced polymerization of acrylamide and N,N’-Methylenebisacrylamide.
It is the most widely used technique of electrophoresis.
Introduction, Principle, Instrumentation and Applications of SDS-PAGEMohammed Mubeen
The following presentation contains helpful information regarding SDS-PAGE, including the history, introduction, principle, instrumentation, advantages and applications of SDS-PAGE.
It is an important tool in biochemical research. Which through rapid spinning imposes high centrifugal forces on suspended particles, or even molecules in solution, and causes separations of such matter on the basis of differences in weight.
It is a subtype of the gel electrophoresis whereby the normal gel is replaced with polyacrylamide gels used as support media.
Gels are made by free radical-induced polymerization of acrylamide and N,N’-Methylenebisacrylamide.
It is the most widely used technique of electrophoresis.
Gel Electrophoresis:
Definition:
Gel electrophoresis is a laboratory technique used to separate and analyze macromolecules such as DNA, RNA, and proteins based on their size and charge. It is a fundamental tool in molecular biology and biochemistry research.
Principle:
The basic principle involves applying an electric field to a gel matrix, typically made of agarose or polyacrylamide. When a current is applied, charged molecules migrate through the gel at rates determined by their size and charge. Smaller molecules move more quickly through the gel, while larger ones move more slowly.
Applications:
Gel electrophoresis is widely used in various applications, including:
-DNA fingerprinting
-Analysis of PCR products
-Checking the purity of nucleic
acid samples
-Protein analysis and
characterization
Electrophoresis is an electrokinetic process which separates charged particles in a fluid using a field of electrical charge. It is most often used in life sciences to separate protein molecules or DNA and can be achieved through several different procedures depending on the type and size of the molecules. The procedures differ in some ways but all need a source for the electrical charge, a support medium and a buffer solution. Electrophoresis is used in laboratories for the separation of molecules based on size, density and purity.An electric field is applied to molecules and as they are electrically charged themselves it results in a force acting upon them. The greater the charge of the molecule the greater the force applied by the electrical field and therefore the further through the support medium the molecule will move relative to its mass.
Some example applications of electrophoresis include DNA and RNA analysis as well as protein electrophoresis which is a medical procedure used to analyse and separate the molecules found in a fluid sample (most commonly blood and urine samples).Different types of gels are usually used as the support medium for electrophoresis and this may be in slab or tube form depending on which is more beneficial. Gel slabs enable many samples to be run simultaneously and so are frequently used in laboratories. However, tube gels give a better resolution of the results so are often chosen for protein electrophoresis.
Agarose gel is commonly used for electrophoresis of DNA. It has a large pore structure allowing larger molecules to move easily but it is not suitable for sequencing smaller molecules.
Polyacrylamide gel electrophoresis (PAGE) has a clearer resolution than agarose gel making it more suitable for quantitative analysis. This makes it possible to identify how proteins bind to DNA. It can also be used to develop an understanding of how bacteria is becoming resistant to antibiotics through plasmid analysis.
Isoelectric focusing is a technique used in biochemistry and molecular biology to separate and analyze proteins based on their isoelectric points (pI). It involves the use of an electric field to separate proteins in a gel matrix based on their pI values. Proteins migrate towards an electrode until they reach a pH region that corresponds to their pI, where they become electrically neutral and stop migrating. The technique is commonly used in protein purification and characterization, as well as in clinical diagnosis and research.
i am HAFIZ M WASEEM from mailsi vehari
BSc in science college Multan Pakistan
MSC university of education Lahore Pakistan
I love Pakistan and my teachers
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Dr. Vinod Kumar Kanvaria
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at Integral University, Lucknow, 06.06.2024
By Dr. Vinod Kumar Kanvaria
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
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Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
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3. INTRODUCTION
• Isoelectric focusing (IEF), is a technique for separating different molecules by
based on their isoelectric point.
• It is also known as electro focusing.
• IEF is performed in a ph gradient.
Basic principle involved is electrophoresis
• IEF is well established as an excellent technique for the analysis of proteins,
such as enzymes, hormones or other biologically active proteins.
4. ISOELECTRIC POINT
• The ph. at which net charge on protein becomes zero.
• Proteins are separated in a pH gradient according to their isoelectric points.
• Proteins are amphoteric molecules with acidic and basic buffering groups (side
chain).
• Proteins are positively charged in solutions at pH values below pI and
migrate towards cathode.
• Proteins are negatively charged in solutions at pH values above pI and
migrate towards anode.
5.
6. PRINCIPLE
• Separates proteins by their isoelectric points.
• Each protein has own pl=ph at which the protein has equal amount of positive and negative
charges i.e the net charge is zero.
7. AMPHOLYTE
• Ampholytes are low molecular weight molecules that help in creating a stable
pH gradient.
• They are isomers of polycarboxylic acids.
PROPERTIES:
• It should be soluble in water.
• It should have low absorption spectra.
• It should offer conductance.
8. Synthetic carrier ampholyte:
High buffering capacity and solubility at the pI.
Good and regular electric conductivity at the pI.
Absence of biological effects.
Low molecular weight.
Natural occurring ampholyte:
Amino acids or peptides
Lack the properties above
Can not be used in IEF.
9. What is a gel ?
Gel is a cross linked polymer whose composition and porosity is chosen based
on the specific weight and porosity of the target molecules.
Types of Gel:
• Agarose gel.
• Polyacrylamide gel.
10. AGAROSE GEL
• A highly purified uncharged polysaccharide derived from agar.
• Used to separate macromolecules such as nucleic acids, large proteins and protein
complexes.
• It is prepared by dissolving 0.5% agarose in boiling water and allowing it to cool to 40°C.
• It is fragile because of the formation of weak hydrogen bonds and hydrophobic bonds.
• Nontoxic gel medium
• Good for separating large DNA molecules and poor for separating small DNA molecules.
11. POLYACRYLAMIDE GEL
• Used to separate most proteins and small oligonucleotides because of
the presence of small pores.
• Polyacrylamide gels are tougher than agarose gels.
• Polyacrylamide gels are composed of chains of polymerized
acrylamide.
• Sharp bands.
12.
13.
14. PREPARATION AND SAMPLING
• ACRYLAMIDE, AMMONIUM PERSULPHATE(APS), TEMED, CARRIER AMPHOLYTE, UREA,
WATER.
• An electrophoresis chamber and power supply
• Gel casting trays, which are available in a variety of sizes and composed of UV transparent plastic. The
open ends of the trays are closed with tape while the gel is being cast, then removed prior to electrophoresis.
• Sample combs, around which molten medium is poured to form sample wells in the gel.
• Electrophoresis buffer, usually Tris-acetate-EDTA (TAE) or Tris-borate-EDTA (TBE).
• Loading buffer, which contains something dense (e.g. glycerol) to allow the sample to "fall" into the
sample wells, and one or two tracking dyes, which migrate in the gel and allow visual monitoring or how far
the electrophoresis has proceeded.
15. • Staining: DNA molecules are easily visualized under an ultraviolet lamp
when electrophoresed in the presence of the extrinsic Fluor ethidium
bromide.
• Ethidium bromide is a known mutagen or carcinogenic and should be
handled as a hazardous chemical - wear gloves while handling
• To prepare gel, agarose powder is mixed with electrophoresis buffer to the
desired concentration, and heated in a microwave oven to melt it. Ethidium
bromide is added to the gel (final concentration 0.5 ug/ml) to facilitate
visualization of DNA after electrophoresis.
16. • After cooling the solution to about 60℃ it is poured into a casting tray containing a
sample comb and allowed to solidify at room temperature.
• Samples containing DNA mixed with loading buffer are then pipetted into the
sample wells, the lid and power leads are placed on the apparatus and a current is
applied run the gel for 30-45 mins at 100-150V. The current flow can be confirmed
by observing bubbles coming off the electrodes
• DNA will migrate towards the positive electrode, which is usually colored red, in
view of its negative charge and separated based on their isoelectric points.
17. Technique combining ideas of isoelectric points and electric fields. It
gives good separation with a high resolution compared to any other
method
18. CALCULATING pH
• After the time period of electrophoresis, the power is turned off and the gel is blot dried.
• The band containing protein sample is cut into pieces and the distance of the band from any
one of the electrode is calculated.
• The band is then incubated in a solution of Potassium chloride, by doing this pH of the band
is obtained.
• A graph is plotted taking pH of the band on X-Axis and distance of band on Y-Axis.
• A standard curve is obtained and pI value is calculated.
19. APPLICATIONS
• Widely used for separation and identification of serum proteins.
• Used in food and agricultural industries, forensic and human genetics laboratories.
• Used in enzymology, immunology and membrane biochemistry.
• 2D Gel electrophoresis is an application of IEF.
• Protein is first separated based on pI and then based on molecular weight using SDS-
PAGE.