This document provides information on sterilization methods used in agricultural sciences. It discusses both physical and chemical sterilization techniques. The physical methods covered are dry heat sterilization using hot air ovens, moist heat sterilization using autoclaves, and radiation sterilization using UV light or gamma rays. The chemical methods discussed are sodium hypochlorite, ethanol, mercuric chloride, formaldehyde, and hydrogen peroxide. Autoclaving at 121°C for 30-60 minutes is described as the most common moist heat sterilization technique. Both physical and chemical sterilization methods aim to denature proteins, damage cell membranes, or disrupt DNA/RNA to kill microorganisms.
Aseptic technique, culturing and preservation by Likhith KLIKHITHK1
Aseptic technique is a method of compete elimination of microorganism, used in laboratories or clinical setting to prevent the contamination or growth of unwanted microorganism.
Pure cultures are important in microbiology for the following reasons:
Once purified, the isolated species can then be cultivated with the knowledge that only the desired microorganism is being grown.
A pure culture can be correctly identified for accurate studying and testing and diagnosis in a clinical environment.
Testing/experimenting with a pure culture ensures that the same results can be achieved regardless of how many time the test is repeated.
Pure culture spontaneous mutation rate is low
Pure culture clone is 99.999% identical
To maintain pure culture for extended periods in a viable conditions, without any genetic change is referred as Preservation. The aim of preservation is to stop the cell division at a particular stage i.e. to stop microbial growth or at least lower the growth rate. Due to this toxic chemicals are not accumulated and hence viability of microorganisms is not affected.
Aseptic technique, culturing and preservation by Likhith KLIKHITHK1
Aseptic technique is a method of compete elimination of microorganism, used in laboratories or clinical setting to prevent the contamination or growth of unwanted microorganism.
Pure cultures are important in microbiology for the following reasons:
Once purified, the isolated species can then be cultivated with the knowledge that only the desired microorganism is being grown.
A pure culture can be correctly identified for accurate studying and testing and diagnosis in a clinical environment.
Testing/experimenting with a pure culture ensures that the same results can be achieved regardless of how many time the test is repeated.
Pure culture spontaneous mutation rate is low
Pure culture clone is 99.999% identical
To maintain pure culture for extended periods in a viable conditions, without any genetic change is referred as Preservation. The aim of preservation is to stop the cell division at a particular stage i.e. to stop microbial growth or at least lower the growth rate. Due to this toxic chemicals are not accumulated and hence viability of microorganisms is not affected.
The above PPT includes different methods of sterilization- Dry heat, Moist heat, Radiation and Chemical methods. It also includes the basic knowledge on sterilization and tests for sterility.
The above PPT includes different methods of sterilization- Dry heat, Moist heat, Radiation and Chemical methods. It also includes the basic knowledge on sterilization and tests for sterility.
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Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
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Safalta Digital marketing institute in Noida, provide complete applications that encompass a huge range of virtual advertising and marketing additives, which includes search engine optimization, virtual communication advertising, pay-per-click on marketing, content material advertising, internet analytics, and greater. These university courses are designed for students who possess a comprehensive understanding of virtual marketing strategies and attributes.Safalta Digital Marketing Institute in Noida is a first choice for young individuals or students who are looking to start their careers in the field of digital advertising. The institute gives specialized courses designed and certification.
for beginners, providing thorough training in areas such as SEO, digital communication marketing, and PPC training in Noida. After finishing the program, students receive the certifications recognised by top different universitie, setting a strong foundation for a successful career in digital marketing.
Acetabularia Information For Class 9 .docxvaibhavrinwa19
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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.
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pgs sterilization (2).pptx
1. UNIVERSITY OF AGRICULTURAL SCIENCES BANGALORE
DEPARTMENT OF PROCESSING AND FOOD ENGINEERING
Submitted to:-
Er. BABU R M ROY
ASSISTANT PROFESSOR
COLLEGE OF AGRICULTURAL
ENGINEERING,GKVK
Presented By:
ABHISHEK J
ID No. : PAMB1374
Snr.M Tech[PFE]
Course title: Basic Concepts In Laboratory
Techniques. PGS 504 (0+1)
1
3. Sterilization (Latin sterilis meaning barren) is the complete removal or
inhibition of all live forms (living cell, spores, virus, etc.) from any object
INTRODUCTION
4. METHODS OF STERILIZATION
1. PHYSICAL METHOD:
Involves processes by the use of physical means
Utilisation of heat, moisture, radiation or membrane filtration methods.
A) DRY HEAT STERILIZATION
Heat is the most reliable and rapid method of sterilization
5. 1. Sunlight and drying:
Action primarily due to UV rays
2. Heat:
Most reliable method of sterilization and most preferred method.
Eg: Inoculating wire, needles, forceps, etc
3. Flaming:
Passed over flame without allowing utensils and other equipments to
become red hot.
Eg: Culture tube, glass slides, needles, cover slips, etc.
6. 4. HOT AIR OVEN
Hot air ovens are electrical devices used in
sterilization.
The oven uses dry heat to sterilize articles.
Generally, they can be operated from 50 to
300 C (122 to 572 F) .
There is a thermostat controlling the
temperature.
This is the most widely used method of
sterilization by dry heat.
7. B) MOIST HEAT STERILIZATION
Killing of microorganisms with hot water or steam
Mechanism: Denaturation and coagulation of proteins
Divided into three forms in based of temperature:
1. Temperature below 100°C (Pasteurization method)
2. Temperature at 100°C (Tyndallization method)
3. Temperature above 100°C (Autoclaving method)
8. Autoclaves are used to sterilize equipment and supplies by subjecting them to
pressurized saturated steam at 121 °C (250 °F) for around 30-60 minutes at a pressure
of 15 pa
Uses of Autoclaves:
Useful for materials which can not withstand high temperature.
To sterilize culture media, heat stable liquids, saline solutions,
instruments, glasswares, syringes, rubber material, gowns, surgical
dressings, gloves etc.
11. C) RADIATION
Two types of radiation: Ionising radiation & Non-ionising radiation
1. Non-ionizing radiation(HOT STERILIZATION)
Infrared- Used for rapid mass sterilization of pre-packed items such as Syringe.
UV
Used for disinfecting enclosed area such as entryways, operation theatres and
labs.
2. Ionising radiation(Cold sterilization)
Gamma rays: X-rays: Used for sterilising plastics, syringes, swabs, animal feeds,
cardboard, oils, greases, fabric and metal foils.
12. MECHANISM
1. Non-ionizing radiations(UV light) : Induce the production of abnormal
nucleotides such as thymine in the bacterial cell.
2.Ionizing radiation(X-rays, gamma rays ,cathode rays) : causes ionization
resulting in the death of cell.
13. CHEMICAL METHODS OF STERILIZATION
Action of chemical agents Mechanism:
Protein coagulation
Disruption of cell membrane resulting in exposure, damage/loss of contents
Substrate competition.
14. Commonly used chemicals
SODIUM HYPOCHLORITE
Sodium hypochlorite (NaOCl), an oxidizing agent, is used for surface sterilization of plant
parts at a concentration of 0.5%–5%.
NaOCl acts in three ways: saponification, neutralization, and chloramination. It produces
hypochlorous acid (HOCI) and hypochlorite ions (–OCl) that degrade amino acids, suppress
critical enzyme function, damage cell membrane and DNA, and may even hamper
membrane transport
ETHANOL
The ethanol is an amphiphilic compound that affects cell membrane, denatures proteins,
and dissolves lipids in the cell sap. This results in leakage of cell sap and melting of
essential organelles, ultimately leading to cell death. Ethanol acts as lipid solvent. It is
commonly used at a concentration of 60%–85% as a surface sterilant
15. MERCURIC CHLORIDE
Mercuric chloride (HgCl2) is a surface disinfectant and combines with the –SH group
It kills a wide range of microbial targets. The chloride ions generated from HgCl2 are
electronegative that oxidize the peptide linkages and cause protein denaturation . The
HgCl2 at a concentration of 0.01%–0.1% was found effective for surface sterilization of
plant tissues.
FORMALDEHYDE
Formaldehyde is used in both liquid and gaseous states.
It is an alkylating agent that denatures protein and fixes most cellular debris of
microbial flora
Formaldehyde acts on DNA and RNA by alkylating ring nitrogen atoms of purine bases,
and in proteins, it alkylates amino (–NH2) and sulfhydryl (–SH) groups
It is available as 37% (wt/vol) formaldehyde called formalin
16. HYDROGEN PEROXIDE
Hydrogen peroxide is known for broad-spectrum antimicrobial activity against
viruses, yeast, bacteria, and resistant bacterial spores. It is used in various
concentrations ranging from 3% to 90% for surface sterilization. A higher
concentration of hydrogen peroxide (10%–30%) and larger incubation time is
necessary to perform sporicidal function.