New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

Chapter 4 of Microbiology

by: Lauren Dennis

Chapter 4 of Microbiology 2300

Marketplace > Georgia State University > Microbiology > 2300 > Chapter 4 of Microbiology
Lauren Dennis

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

These notes describe microbial growth, and how to observe growth levels
Microbiology 2300
Dr. Fuhua Lu
Class Notes
Microbes, factors, growth
25 ?




Popular in Microbiology 2300

Popular in Microbiology

This 4 page Class Notes was uploaded by Lauren Dennis on Thursday September 8, 2016. The Class Notes belongs to 2300 at Georgia State University taught by Dr. Fuhua Lu in Fall 2016. Since its upload, it has received 16 views. For similar materials see Microbiology 2300 in Microbiology at Georgia State University.


Reviews for Chapter 4 of Microbiology


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 09/08/16
Chapter 4: Microbial growth  Energy Source: o Photoautotroph:sunlight o Photoheterotroph: sunlight o Chemolithoautotroph: Inorganic o Chemoorganoheterotroph: Organic  Carbon Source:  -CO2  Organic Compounds  CO2  Organic Compounds  Nutritional Factors o Required elements: C, O, H, N, S, K, Magnesium, Calcium, Iron o Organisms based on carbon use:  Heterotrophs: organic carbon  Autotrophs: inorganic carbon (CO2) o Trace Elements: small amounts the organism needs  Cobalt, Zinc, Copper, molybdenum, mangnesium  Growth Factors o Some cannot synthesize cell constituents  The elements have to be added to the organism o Can display wide variety of factor requirements Element Function C, O, and H Component of amino acid, lipids, nucleic acids, and sugars N Component of amino acids and nucleic acids Sulfur Component of some nucleic acids Phosphorous Component of nucleic acids, membrane lipids, and ATP Potassium, Magnesium, and Required for the function of Calcium certain enzymes  Bacterial Growth in Lab o “Closed” Batch System: no input of nutrients  population grows in a predictable, steady growth o Growth Curve  Lag phase: no real growth  Log or exponential phase: huge growth of the organism  Produce metabolites that enhance survival  Static phase:  Death phase:  Prolonged decline:  N t N xo2 n  Prokaryotes divide by binary fission  Colony growth on a solid medium  Cells compete for resources o They grow exponentially and then compete for nutrients  Position in the colony determine the resource availability o On the edge: have little competition/ high oxygen stores o In the middle: high population density  Increased competition/ low oxygen stores  Continuous Culture:  Exponential growth can be sustained by the use of chemostat o Continually drips nutrients into the colony o Release of equal waste  Growth in Nature o Biofilm begins when planktonic bacteria attach to surfaces,  Others: attach and grow on the initial layer  Contains open channels for movement of nutrients and waste  Cells within cause disease o Resist immune response and antimicrobials o Treatment becomes difficult  Bioremediation is beneficial use of biofilm o Degradation of organic waste that cannot be removed o Interactions of mixed microbial communities  Prokaryotes live in mixed communities  Many interactions are cooperative o Waste of one is beneficial for another  Cells compete for nutrients o Synthesize toxic substances to inhibit growth of the competition  Environmental Factors: o Temperature  Psychrophite: -5C to 15C  Artic environments  Psychotroph: 20C to 30C  Food spoilage  Mesophile: 25C to 45C  Disease causing  Thermophile: 45C to 70C  Hot Springs  Hyperthermophiles: 70C to 110C  Archaea or Hydrothermal vents o pH  bacteria can survive in various pH’s  Neutrophiles  pH of 5 to 8  optimum near neutral  Acidophiles  pH below 5.5  neutral internal pH, pumps out protons  Alkalophiles  pH above 8.5  maintains by sodium ion exchange o external ion sodium for external protons o Water  Dissolved salts, sugar makes water unavailable to cell  Used to preserve food from bacteria growth  Some can withstand high concentrations of salt  Halotolerant: withstand up to 10%  Halophiles: require high salt concentrations  Marine bacteria


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."

Janice Dongeun University of Washington

"I used the money I made selling my notes & study guides to pay for spring break in Olympia, Washington...which was Sweet!"

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Parker Thompson 500 Startups

"It's a great way for students to improve their educational experience and it seemed like a product that everybody wants, so all the people participating are winning."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.