{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Microbial_growth

Microbial_growth - M icrobialGrowth I Growthforbacteria A...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Microbial Growth  I. Growth for bacteria A. Prokaryotic Binary fission (Fig. 4.1) 1. One cell divides into two daughter cells. Must replicate its chromosome during division. 2. Generation or doubling time- the time it takes for a cell to reproduce under optimal conditions. 3. Results in exponential growth. B. Growth Curve (Figure 4.6) 1. In experimental conditions with nutrient broth cultures where nutrients aren’t added or waste products removed. a. Lag phase       – when the bacteria is trying to establish itself – maybe after being in a freezer or something of the sort b. Log phase       – also called the exponential phase – when the bacteria feeds and grows once it has established itself –  the primary metabolites are made here c. Stationary phase       – when food runs out – basically they are adjusting to try to survive with little food – the  organisms are growing and dying at the same rate. During this phase, secondary metabolites start growing and  killing the primary metabolites.  Secondary metabolites make antibiotics d. Death phase       – When the average organisms start dying. The population decreases e. Prolonged decline (Fig. 4.8)      –  contain the toughest organisms that have learned how to survive 2. Cells synthesize primary metabolites during log phase that allows them to grow more rapidly, such as amino acids,  peptidoglycan and nucleic acids. Cells synthesize secondary metabolites that allow them to become better competitors  during stationary phase. (Fig. 4.7).
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern