This document discusses methods for isolating and identifying bacteria from clinical specimens. It describes collecting specimens, transporting them to the laboratory, and performing microscopic examination. There are several methods for isolating bacteria, including culturing on solid and liquid media, as well as automated systems. Once isolated, bacteria can be identified through staining, biochemical tests, serology, phage typing, identification discs, semi-automated/automated systems, and molecular techniques. The goal is to accurately identify the bacteria causing infection to aid in diagnosis and treatment.
A micro - manipulator is a device which is used to physically interact with a sample under a microscope. It is usually used in conjuction with microscope. It is the method used in the isolation of pure culture technique.
this presentation involves a comprehensive outlines regarding the most common different methods used in diagnostic microbiology to stain bacteria and their structures
A micro - manipulator is a device which is used to physically interact with a sample under a microscope. It is usually used in conjuction with microscope. It is the method used in the isolation of pure culture technique.
this presentation involves a comprehensive outlines regarding the most common different methods used in diagnostic microbiology to stain bacteria and their structures
EMB Agar is a solidifying agent. Dipotassium phosphate is the buffer. Eosin Y and Methylene Blue are the indicators. Methylene blue is also a selective agent. The accompanying micro flora which hinders the isolation of medically important organisms is inhibited by the dyes of the medium, especially gram -positives.
https://www.tmmedia.in/content/emb-agar-0
The carbohydrate fermentation test is used to determine whether a bacterium can utilize a certain carbohydrate or not.
It tests for the presence of acid and/gas produced from the fermentation of a single carbohydrate.
EMB Agar is a solidifying agent. Dipotassium phosphate is the buffer. Eosin Y and Methylene Blue are the indicators. Methylene blue is also a selective agent. The accompanying micro flora which hinders the isolation of medically important organisms is inhibited by the dyes of the medium, especially gram -positives.
https://www.tmmedia.in/content/emb-agar-0
The carbohydrate fermentation test is used to determine whether a bacterium can utilize a certain carbohydrate or not.
It tests for the presence of acid and/gas produced from the fermentation of a single carbohydrate.
Doctors Data Inc A Revolution in the Evaluation of Gastrointestinal MicrofloraBonnieReynolds4
Recent research regarding the gastrointestinal microbiome has irrefutably confirmed the fact that the
microbial inhabitants of the gastrointestinal tract, and their astonishing scope of metabolic activities,
are at the very core of health and numerous disease processes. It is also clear that clinical microbiology
testing should be optimized to address the relative abundance of all bacterial species present in a stool
specimen.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
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Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
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.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
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.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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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
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
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This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
TESDA TM1 REVIEWER FOR NATIONAL ASSESSMENT WRITTEN AND ORAL QUESTIONS WITH A...
methods of isolation of bacteria
1. Mr. ISMAIL TAHASILDAR.(MSc.DMLT.DNHE)
Biochemistry Lecturer Page 1
www.ismailtahasildar.blogspot.com
www.youtube.com/SmileTalkparamedical
METHODS OF ISOLATION OF BACTERIA:
Isolation ofbacteria forms a very significant step in the diagnosis and management ofthe
illness.Isolationofbacteria involves various steps –
1. Specimen collection
2. Preservation and transportation ofspecimen
3. Microscopic examination ofsample
4. Various methods used for isolationofbacteria.
Specimen collection: Many different specimens are sent for microbiological examination
from patients with suspected bacterial infection. Common specimens include urine,
faeces, wound swabs, throat swabs,vaginal swabs,sputum, and blood.Less common,but
important specimens include cerebrospinalfluid,pleural fluid,joint aspirates,tissue, bone
and prostheticmaterial.
Specimens must be accuratelylabelled and accompanied by a properlycompleted
requisitionform, indicatingthe nature of the specimen, the date of sample collection,
relevant clinical information,the investigations required,and details ofantibiotictherapy,
if any.
Preservation and Transport of specimen: Most specimens are sent to the laboratoryin
sterile universal containers.Swabs are placed in a suitable transport medium (e g. charcoal
medium)otherwise it leads to false negative reporting.Specimens should be transported
as soon as possible to the laboratory.In case a delay is anticipatedthe specimen should be
stored at 4° C.
Microscopy: A Gram stain helps with the visualization ofbacteria,and gives an indication
of the type of bacteria present,based on the shape of the bacteria and the staining
properties. A Gram stain also helps to identifymixtures of bacteria,helps to determine the
appropriaterange of agar plates to be used for subsequent culture, and helps with the
interpretation ofculture results. Ziehl-Neelsen (ZN) stain is used to demonstrate the
presence of Mycobacteria.Mycobacteria can also be visualized usingthe fluorescent dye
aura mine and a fluorescence microscope.
2. Mr. ISMAIL TAHASILDAR.(MSc.DMLT.DNHE)
Biochemistry Lecturer Page 2
www.ismailtahasildar.blogspot.com
www.youtube.com/SmileTalkparamedical
Methods of isolation of bacteria can be broadly classified into
1. Culture methods
2. On Solid media
3. On Liquid media
4. Automated systems
5. Non-culture methods
Culture methods:
The specimens received in the laboratoryare plated on the culture media.The
appropriateculture media is selected dependingupon the bacteria suspected.The
followingprecautions need to be taken into considerationwhen the culture methods are
processed.
1. Optimal atmosphericconditions
2. Optimal temperature
3. Growth requirement ofthe bacteria.
1. CULTURE ON SOLID MEDIA:
The principal method forthe detection ofbacteria from clinical specimens is by culture on
solid culture media.Bacteria grow on the surface of culture media to produce distinct
colonies.
e.g. blood,peptone and sugars and other factors (e.g. buffers, salts and indicators).
2. Culture in liquid media:
Bacteria can also be grown in liquid media (broth).Like agar plates,broth cultures maybe
non-selectiveorselective. Bacterial growth is easy to detect as the clear liquid turns
turbid,usuallywithin 24–48hr, but incubationmayneed to be extended to 14 days or
more.
e.g. for detection of bacteria from CSF, or to detect small numbers of Salmonella in a stool
sample containingmanymillions ofother bacteria.
3. Mr. ISMAIL TAHASILDAR.(MSc.DMLT.DNHE)
Biochemistry Lecturer Page 3
www.ismailtahasildar.blogspot.com
www.youtube.com/SmileTalkparamedical
3. Automated system:
Automated blood culture systems eg. BACTEC,Bacte Alert utilizes liquid culture.Bacterial
growth may be detected by a varietyof methods
e.g. detection of bacterial CO2 production.
BACTERIAL IDENTIFICATION:
The isolated bacteria are further processed through one or few of the procedures
mentioned belowso as to identifythe bacteria.
1. Stainingof the isolated bacteria
2. Motilitytesting
3. Biochemical testing
4. Serological tests
5. Phage typing
6. Identificationdisctesting
7. Semiautomated and Automatedidentification systems
8. Moleculartechniques.
i) Staining of the isolatedbacteria:
Stainingofthe bacteria forms the foremost and the most important step in the
identification ofbacteria.The isolated bacteria are stained byvarious methods depending
upon the bacteria in focus. Various stainingtechniques are as follow:
1. Gram staining: differentiates bacteria into two types Gram positiveand Gram negative
bacteria Gram positivebacteria can be either cocci or bacilli or vibrios.Gram positive
pathogenicbacteria are staphylococci,streptococci,pneumococci,etc Gram negative
bacteria can be either cocci or bacilli.Gram negative pathogenicbacteria commonly
encountered are E.coli, Klebsiella,Salmonella spp,shigella,etc
2. Albert staining: is performed in case if one suspects a Corynebacterium spp.
3. Acid fast staining: is performed in cases suspected of Mycobacterial infection.Eg.
Tuberculosis,leprosy,etc.
4. Special stainingis necessary in case of spirochetes and other organisms.
(i) Motility testing:
Motilitytestingis performed by preparinga wet mount and is then observed under the
microscope.Motilityof bacteria can also be tested by inoculatingthe bacteria in the
semisolid motilitymedium.
4. Mr. ISMAIL TAHASILDAR.(MSc.DMLT.DNHE)
Biochemistry Lecturer Page 4
www.ismailtahasildar.blogspot.com
www.youtube.com/SmileTalkparamedical
(ii) Biochemical tests:
The stainingis followed by use of various biochemical reagents and tests to get closer to
the identification ofbacteria.There are many biochemical tests available forbacterial
identification.Few of them are required to be carried out dependingupon the bacteria.
The commonlyused biochemical tests are as mentioned below
(a) Catalase test
(b) Coagulase test
(c) Oxidase test
(d) Sugar fermentation test
(e) Indole test
(f) Citrate test
(g) Urease test
Serology:
It forms an important step in bacterial identification.It usuallyinvolves detectionof
antigens by enzyme or fluorescence immunoassays.Serologyis also used to confirm
identification obtainedbyother methods.
For example, salmonella species identified by biochemical tests is processed for
serotypingby slide agglutination.Another example beingVibrio cholera.
Phage typing:
Phage typing is a method used for detectingsingle strains ofbacteria.It is used to trace
the source of outbreaks ofinfections.The viruses that infect bacteria are called
bacteriophages (“phages”for short)and some of these can onlyinfect a single strain of
bacteria.These phages are used to identifydifferent strains ofbacteria within a single
species.
Identification discs:
Kirby Baur discdiffusion method is primarilyaimed to identifythe antibioticsusceptibility
of the bacteria.It is also helpful in identificationofsome bacteria for eg; Micrococci spp,
Streptococci spp,Morexalla spp,etc
Semiautomated and Automated identification systems:
The isolated colonies obtained,are processed by these system. The system identifies the
bacteria and also carries out the antibioticsusceptibilitytestingfor the same.
Molecular techniques:
Molecularmethods includes G+C % content,DNA-DNA hybridisation and DNA base
sequencing.These methods are not used routinelyused in hospitallaboratories.
Eg. Neisseria gonorrhoea,Leptospirosis, etc.