Bacterial Growth and Multiplication-Microbiology|ICDS supervisor Exam Kerala PSC

Bacterial Growth and Multiplication-Microbiology|ICDS supervisor Exam Kerala PSC

Bacterial Growth and Multiplication 

Bacterial Growth and Multiplication 

Bacterial growth refers to the increase in the no. of individual cell.

 Normally bacteria reproduce by Binary Fission. 

Asexual reproduction is a separation of a body into two new bodies in the process of a binary fission. 

Organisms duplicates its genetic material and then divides into two parts with each new organism receiving one copy of DNA .

A few bacterial species also reproduce by Budding. 

Budding is formation of small initial outgrowth which is called Bud then it enlarges until its size approaches to the parent cell and then it separate. 

Generation Time

The time required for a cell to divide (and its population to double) is called the generation time.

 E. coli under favorable conditions double in 20 minutes and Mycobacterium in 24hours.

 Logarithmic Representation of Bacterial Populations 

Phases of Growth When a few bacteria are inoculated into a liquid growth medium and the population is counted at intervals, it is possible to plot a bacterial growth curve that shows the growth of cells over time. 

There are four basic phases of growth: 

The lag, log, stationary, and death phases. 

1.The Lag Phase 

This period of little or no cell division is called the lag phase, and it can last for 1 hour or several days depending upon the species of bacteria. 

The microbial population is undergoing a period of intense metabolic activity involving, in particular, synthesis of enzymes and various molecules.

2. The Log Phase

 In this phase the cells begin to divide and enter a period of growth, or logarithmic increase, called the log phase, or exponential growth phase. 

Cellular reproduction is most active during this period, and generation time reaches a constant minimum. 

Because the generation time is constant, a logarithmic plot of growth during the log phase is a straight line. 

The log phase is the time when cells are most active metabolically and is preferred for industrial purposes where, for example, a product needs to be produced efficiently. 

3.  The Stationary Phase

 If exponential growth continued unchecked, startlingly large numbers of cells could arise but in reality this does not happen. 

In this phase the growth rate slow down the number of microbial deaths balances the number of new cells, and the population stabilizes. 

The metabolic activity of individual cell serving also slows down at this stage. 

4. The Death Phase

The number of deaths eventually exceeds the number of new cells formed, and the population enters the death phase, or logarithmic decline phase. 

This phase continues until the population is diminished to a tiny fraction of the number of cells as compared to the previous phase or until the population dies out entirely.

 Many bacterial cells often undergoes involution during this phase meaning that their morphology changes dramatically & make them difficult to identify.

Also Read;

Morphology of Bacteria

Anatomy of Bacteria

Vaccination -Types


This topic is important for the ICDS Supervisor Exam.Click  HERE.

You can Go to more posts Regarding ICDS Supervisor Kerala PSC Here.

More ICDS Supervisor Kerala PSCSociology Notes Here


ICDS Supervisor Kerala PSC Homescience Notes Here

Microbiology Notes


ICDS Supervisor Kerala PSC Food ,Nutrition and Health Notes Here 

To Join Telegram, Click Here

Check These also

Read Also: 

ICDS Supervisor Questions and Answers

Common Health Problems in India & Different Levels of Health care in India

1. Meal Planning for the Infant

2. Spplementary foods for Infants

3. Importance of Breast Milk

4. How to Feed Infant? Meal Plan for Infants

5. Meal Planning for the Prechoolers

Topic wise Notes for ICDS Supervisor Exam

 

1.      Home Science, 

2.      Food and Nutrition, 

3.      Psychology

4.       Physiology

5.       Microbiology

6.       Sociology 

7.      Nutrition and Health 

 

MCQ Questions & Answers for ICDS Supervisor

 

1.      ICDS Supervisor NOTES

2.      Previous Questions MCQ|ICDS Supervisor Exam|ICDS Supervisor Kerala PSC (1-20)

3.      Previous Questions MCQ|ICDS Supervisor Exam|ICDS Supervisor Kerala PSC (21-30)

4.      ICDS Supervisor MCQ-1

5.      ICDS Supervisor MCQ set 1

6.      ICDS Supervisor MCQ set 2

7.      ICDS Supervisor MCQ set 3

8.      ICDS Supervisor MCQ set 4

9.      Nutrition & Health MCQ 1

10.  Nutrition & Health MCQ 2

11.  Nutrition & Health MCQ 3

12.  Nutrition & Health MCQ 4

13.  ICDS Supervisor Previous Questions Set 1

14.  ICDS Supervisor Previous Questions Set 2

15.  ICDS Supervisor Previous Questions Set 3

16.  ICDS Supervisor Previous Questions Set 4

17.  ICDS Supervisor Previous Questions Set 5

18.  ICDS Supervisor Previous Questions Set 6

19.  ICDS Supervisor Previous Questions Set 7

20.  ICDS Supervisor Previous Questions Set 8

21.  ICDS Supervisor Previous Questions Set 1

22.  Elementary Care & Education MCQ

23.  Solved Previous Question Paper ICDS Supervisor

24.  Women & Child ICDS Supervisor Exam

25.  Extension Education Notes for ICDS Supervisor

26.  Complete NOTES Child Psychology

 

 

Nutrition Notes

 

5 Food Groups

Nutrition MCQ 1

Nutrition MCQ 2

 

More Topic wise Notes can be got from the Website https://www.previousquestions.in

 

 To Join Telegram, Click Here

Check These also

Job News

Latest Job Notifications Check HERE

Gulf Job News Check Here

Exam Preparation

Best Books for Competitive Exams

Download the Syllabus for all exams

SCERT Textbooks Kerala Download

Malayalam GK Notes

previous Question Papers

Download printable  OMR Sheet PDF for practice

Study Tips          

Click the Below topic Links to get The notes

Complete NOTES Child Psychology

മന:ശാസ്ത്ര പഠനരീതികള്‍ (methods of psychological studies)

വ്യത്യസ്ത മന:ശാസ്ത്ര ശാഖകള്‍ Different Branches of Psychology

വ്യത്യസ്ത മന:ശാസ്ത്രസിദ്ധാന്തങ്ങള്‍

നിരീക്ഷണ പഠന സിദ്ധാന്തം

വിലയിരുത്തല്‍ Assessment

 
 
സ്വയം വിലയിരുത്തലും പരസ്പര വിലയിരുത്തലും (peer assessment)

 
121/2017 Pre Primary teacher Previous Question paper with solutions

 
ബുദ്ധി (INTELLIGENCE)

 
ഹവാര്‍ഡ് ഗാര്‍ഡ്നര്‍- ഒമ്പതുതരം ബുദ്ധി

പഠനം 5 വാദങ്ങൾ

ബിഹേവിയറിസം

ഗസ്റ്റാള്‍ട്ടിസം Gestaltism Learning methods

ജ്ഞാതൃവ്യവഹാരവാദം ( Cognitive behaviorism)

 
മാനവികതാവാദം (Humanism)

ജ്ഞാതൃവാദം (Cognitivism)


നാഡീമന:ശാസ്ത്രം (neuropsychology)|പഠനത്തെ സ്വാധീനിക്കുന്ന ഘടകങ്ങള്‍

 
കോള്‍ബര്‍ഗിന്റെ സന്മാര്‍ഗവികാസഘട്ടങ്ങള്‍

വ്യക്തിത്വം Personality

 
ഉള്‍പ്പെടുത്തിയുളള വിദ്യാഭ്യാസം Inclusive education

PART 2 ഉള്‍പ്പെടുത്തിയുളള വിദ്യാഭ്യാസം  Inclusive education

ദിനാചരണങ്ങള്‍ Important dates based on themes

 
 
 

READ More :

 

ICDS SUPERVISOR Malayalam Notes

Child Psychology Notes

Anganwadi Worker Notes

 Pedagogy  Malayalam Notes

LPSA Study Notes

KTET Notes

UPSA Study Notes

Complete NOTES Child Psychology