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Basic biochemical tests for identification of most common bacteria along with their principles and methods to perform and quality control for UG & PG Students.
Biochemical tests for bacterial identificationSuprakash Das
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New rapid method for detection of salmonella in meat and poultry using actero tmSandra Rogoza
Poster Presentation by Dr. Sergiy Olishevskyy, Bsc, PhD of FoodChek Laboratories at IFT 2016.
Despite control and prevention efforts, Salmonella infections arising from contaminated meat and poultry continue to be a significant problem, with millions of cases occurring each year. Conventional methods for the detection of Salmonella can require up to seven days for a positive result and are not appropriate for routine testing of large numbers of samples. Thus, the development and implementation of rapid detection methods of Salmonella are among the most important food safety tasks.
The objective of this study was to develop a sensitive and rapid method for Salmonella detection in meat and poultry, including raw ground beef, raw ground chicken and chicken carcass rinses. This study included validation of a new protocol based on single-step enrichment with Actero™ Salmonella Enrichment Media followed by detection using the DuPont™ BAX® System Real-Time PCR Assay for Salmonella .
Microbial S.L. is a biotechnological company devoted to the design and production of products for the rapid detection of pathogen microorganisms in environmental and food samples.
INDOLE TEST
UREASE TEST
CITRATE TEST
METHYL RED(MR) TEST
VOGES – PROSKAUER(VP) TEST
TRIPLE SUGAR IRON(TSI) TEST
OXIDASE TEST
CATALASE TEST
CATALASE TEST-Principle:-
This test demonstrates presence of catalase enzyme. This enzyme catalyses the release of O2 from H2O2.
catalase
2H2O2 H2O + increase O2
Reagents:- 1) 3% H2O2.
2) 24 hrs cultured organisms
Procedure:-
With sterile wooden stick transfer culture organisms to test tube containing 3% H2O2 and observe for production of effervescence.
It can also be tested directly on growth plate.
Positive Control: Staphylococci.
Negative Control: Streptococci.
False positive reactions:
If culture medium contains catalase enzyme e.g., blood agar, chocolate agar.
If iron wire loop is used
Each of the letters in “IMViC” stands for one of these tests. “I” is for indole; “M” is for methyl red; “V” is for Voges-Proskauer, and “C” is for citrate, lowercase “i” is added for the ease of pronunciation. IMViC is an acronym that stands for four different tests
Indole test
Methyl red test
Voges-Proskauer test
Citrate utilization test
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recent microbial techniques & advancement in identifying, cultivating,& handl...Karunanidhan3
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Discussion on the types of culture media. Definitions and terminologies that should be noted in the discussion of the topic. Notes provided by the microbiology professor.
Macroeconomics- Movie Location
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Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
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http://sandymillin.wordpress.com/iateflwebinar2024
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.
2. Tests To Know
Case Study Tests
Indole
Methyl Red/Voges Proskauer
Citrate
H2S production in SIM
Urea hydrolysis
Motility
Lactose fermentation
Sucrose fermentation
Glucose fermentation & gas production
Staphylococcus identification tests
BAP
MSA
Mstaph broth
Coagulase
3. Indole Test
How to Perform Test: Inoculate Tryptone broth with inoculating loop.
Property it tests for: This test is performed to help differentiate species
of the family Enterobacteriaceae. It tests for the bacteria species’ ability to
produce indole. Bacteria use an enzyme, tryptophanase to break down the
amino acid, tryptophan, which makes by-products, of which, indole is one.
Media and Reagents Used: Tryptone broth contains tryptophan.
Kovac’s reagent—contains hydrochloric acid, dimethylaminobenzaldehyde,
and amyl alcohol—yellow in color.
Reading Results: Kovac’s reagent reacts with indole and creates a red
color at the top part of the test tube.
5. Methyl Red/Voges Proskauer
(MR/VP)
How to Perform Tests: Inoculate 2 glucose broths with
inoculating loop. After 48 hours of incubation, add a few drops of
MR to one tube, and VP reagents to the other tube.
Properties they test for: Both tests are used to help
differentiate species of the family Enterobacteriaceae.
MR—tests for acid end products from glucose fermentation.
VP—tests for acetoin production from glucose fermentation.
Media and Reagents Used:
Glucose Broth
Methyl Red indicator for acid
Voges Proskauer reagents—A: 5% Alpha-Naphthol, & ethanol, B:
Potassium Hydroxide, & Deionized Water.
6. MR/VP continued
Reading Results:
MR— a + result is red (indicating pH below 6) and a – result is yellow (indicating
no acid production)
VP—A + result is red after VP reagents are added (indicating the presence of
acetoin) and a – result is no color change.
Methyl Red: left – and right + VP: left + and right –
7. Citrate
How to Perform Test: Inoculate slant with inoculating loop.
Property it tests for: This test is used to help differentiate species of the
family Enterobacteriaceae. It is selective for bacteria that has the ability to
consume citrate as its sole source of carbon and ammonium as sole nitrogen
source.
Media and Reagents Used: Simmon’s Citrate Agar contains sodium
citrate (carbon source), ammonium ion (nitrogen source), & pH indicator—
bromthymol blue.
Reading Results:
A + result is blue (meaning the bacteria metabolised citrate and produced an acid
end product) and a – result remains green
9. H2S Production in SIM
How to Perform Test: Stab SIM media with inoculating needle.
Property it tests for: This test is used to help differentiate species of the
family Enterobacteriaceae. This test is used to determine the ability to reduce
sulfur into H2S.
Media and Reagents Used: SIM media contains the sulfur containing
amino acid, cysteine, sodium thiosulfate, & peptonized iron or ferrous sulfate.
Reading Results: H2S will react with the iron or ferrous sulfate and
produce a black precipitate. A positive result has a black precipitate present
and a negative result has no black precipitate.
10. Urea Hydrolysis
How to Perform Test: Inoculate Urea broth with
inoculating loop.
Property it tests for: This test is done to determine a
bacteria’s ability to hydrolyze urea to make ammonia using the
enzyme urease.
Media and Reagents Used: Urea broth contains a
yeast extract, monopotassium phosphate, disodium
phosphate, urea, and phenol red indicator.
Reading Results: Urea broth is a yellow-orange color.
The enzyme urease will be used to hydrolyze urea to make
ammonia. If ammonia is made, the broth turns a bright pink
color, and is positive. If test is negative, broth has no color
change and no ammonia is made.
11. Motility Test
How to Perform Test: Stab motility media with inoculating
needle.
Property it tests for: This test is done to help differentiate
species of bacteria that are motile.
Media and Reagents Used: Motility media contains
tryptose, sodium chloride, agar, and a color indicator.
Reading Results: If bacteria is motile, there will be growth
going out away from the stab line, and test is positive. If bacteria
is not motile, there will only be growth along the stab line. A
colored indicator can be used to make the results easier to see.
13. Lactose Fermentation
How to Perform Test: Inoculate lactose broth with inoculating loop.
Property it tests for: This tests for the bacteria’s ability to ferment
lactose.
Media and Reagents Used: Lactose broth contains beef extract, gelatin
peptone, and lactose. A phenol red indicator is added to indicate acid
production from fermentation.
Results
A positive result is yellow after indicator is added (indicating lactose
fermentation)
A negative result will have no color change or will be redish.
14. Sucrose Fermentation
How to Perform Test: Inoculate sucrose broth with inoculating loop.
Property it tests for: This test is done to help differentiate species of the
family Enterobacteriaceae. This tests for the bacteria’s ability to ferment
sucrose and production of acid end-product
Media and Reagents Used: Sucrose broth contains beef extract,
gelatin peptone, and sucrose. Phenol red indicator is added to indicate an
acid end-product.
Results
A positive result is yellow after indicator is added (indicating sucrose
fermentation)
A negative result has no color change or is reddish.
15. Glucose Fermentation & Gas
Production
How to Perform Test: Inoculate broth with inoculating loop.
Property it tests for: This test is done to help differnetiate species of the
family Enterobacteriaceae. This tests for the bacteria’s ability to ferment
glucose and produce gas and/or an acid end-product..
Media and Reagents Used: Glucose broth contains beef extract,
gelatine peptone, and glucose. A phenol red indicator is added to indicate an
acid enproduct. A Durham tube is added to indicate gas production.
Results
A positive result for acid is yellow after indicator is added (indicating
glucose fermentation)
A positive result for gas is a bubble in the Durham tube.
A completely negative result has no color change or reddish color and no
bubble.
16. Sugar Fermentation Tests
Tube 1: Negative acid /Negative gas
Tube 2A: Must incubate longer (ambiguous result)
Tube 2B: Positive acid /Negative gas
Tube 3A: Positive acid/ Positive gas
17. BAP with Novobiocin Test
How to Perform Test: Inoculate a BAP plate using streak plate
method and incubate 24-48 hours. Place a novovbiocin disk in the first
quadrant of the streak.
Property it tests for: This test is used to determine two things:
It determines if the organism is resistant or sensitive to Novobiocin
It also determines if the organism can lyse red blood cells (hemolysis)
Media and Reagents: Media contains nutrient agar with 5%
sheep's blood added. A Novobiocin antibiotic disk is added
after inoculation.
18. BAP with Novobiocin
Possible test results:
Hemolysis
– Hemolysis occurs if the media surrounding the colonies turns translucent or green
in color
Novobiocin resistance
– Measure the zone of clearing around the disk. If the zone of clearing is smaller
than the manufacturers recommendations for sensitivity (see package instructions)
then the organism is resistant.
No hemolysis; Top streak is R for
NB and bottom is S Hemolytic bacteria
Non-hemolytic bacteria
19. Mannitol Salt Agar (MSA)
How to Perform Test: Inoculate an MSA plate using streak plate
method and incubate 24-48 hours.
Property it tests for: This tests for the bacteria’s ability to
tolerate 7% salt concentration and ferment mannitol. The media
is selective because it selects for salt tolerant bacteria. The
media is also differential because it differentiates the salt tolerant
organisms on their ability to ferment mannitol.
Media and Reagents: MSA media contains nutrient agar,
mannitol, 7% sodium chloride and phenol red indicator.
20. MSA Results
Reading Results:
If the organism is tolerant to salt it will grow.
If the organism is not tolerant to salt it will not grow.
If the salt tolerant organism can ferment mannitol then there will be yellow zones
around the colonies.
If the salt tolerant organism cannot ferment mannitol then the media will remain pink.
Growth with no mannitol fermentation.
Growth with + mannitol fermentation.
21. Mstaph broth
How to Perform Test: Inoculate broth and incubate for
24-48 hours.
Property it tests for: This tests for the bacteria’s
ability to tolerate 7% salt concentration and ferment
mannitol. The media is selective because it selects for
salt tolerant Staphylococcus.
Media and Reagents: This media contains
nutrients appropriate for growing Staphylococcus and
7% salt.
22. M-STAPH Results
Reading Results:
If the organism is tolerant to salt it will grow.
If the organism is not tolerant to salt it will not grow.
Tolerates Salt.
Does not tolerate salt.
23. Coagulase
How to Perform Test: Inoculate rabbit plasma with one
single colony. Break up colony and stir until blended in plasma.
Incubate at 37 degrees C for 24 hours.
Property it tests for: This tests for the bacteria’s
ability to clot blood plasma using the enzyme
coagulase. If the organism has coagulase it will clump
rabbit plasma.
Media and Reagents: This media contains rabbit
plasma dissolved in buffer.
24. Coagulase Results
Reading Results:
If the organism is has coagulase it will clump the plasma.
If the organism does not have coagulase it will not clump the plasma.