Cultivation of Bacteria Flashcards

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1
Q

what effects bacterial growth?

A

nutritional factors
environmental factors

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2
Q

what are abiotic environmental factors that affect bacterial growth?

A

temperature, pH, oxygen, CO, water availability/osmotic pressure

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3
Q

what are most bacteria - pick on the chart

A

mesophiles

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4
Q

what is the transport media and cultures media usual pH? why is this important

A

7 - has buffers to keep at this value
optimal pH for most bacteria 6.5-7.5

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5
Q

label the aerobic capacity of the bacteria? ex. obligate aerobe, obligate anerobe

A
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6
Q

what do anerobic bacteria require to grow?

A

anaerobic transport media
reducing culture media
anaerobic jar

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7
Q

what is a capnophile?

A

bacteria requiring 5-10% CO2 for optimal growth

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8
Q

what are most capnopiles aerobic descriptor?

A

microerophilic

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9
Q

what type of bacteria do not require NaCl but can grow under saline?

A

Halotolerant bacteria

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10
Q

how does transport media help prevent desiccation?

A

provide moisture until sample can be cultured

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11
Q

what is a chemoheterotroph?

A

use organic compounds for energy and carbon

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12
Q

what is a fastidious bacteria?

A

requiring additional organic compounds in their culture media

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13
Q

Are most bacteria chemoheterotrophic or fastidious?

A

chemoheterotrophic

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14
Q

which require more growth factors - chemoheterotrophic or fastidious?

A

fastidious

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15
Q

match the term to the description - liquid media, solid media, semi-solid agars

  1. used for isolation of pure cultures, estimating the number of viable bacteria
  2. ideal for growing large numbers of bacteria
  3. used for determining motility, growing microaerophiles
A

1 - solid media
2 - liquid media
3 - semi-solid agars

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16
Q

what are growth factors

A

things that bacteria need for growth and the organism cannot synthesize

17
Q

Is agar a solidifying agent or nutrient?

A

solidifying agent

18
Q

what is a colony?

A

population of cells arising from a single cell or spore, or from a group of cells of the same species or strain

19
Q

what is the function of basal media?

A

sustain growth of less fastidious bacteria

20
Q

what is the function of enriched media?

A

basal media + additional nutrients, used to cultivate fastidious organisms

21
Q

what is the function of selective media?

A

reagents added that inhibit the growth of unwanted bacteria while allowing the growth of others

22
Q

what is the function of differential (indicator) media?

A

contain components that allow the differentiation of closely related taxa based on appearance of colony or surrounding media

23
Q

what is the function of transport media?

A

for transport of clinical specimens to the lab, preserve microbial viability and help maintain the original ratio of microbes in the sample

24
Q

what is a pure culture?

A

contains only 1 species of microbe

25
Q

what are the goals of a preserved pure culture?

A

viability, purity, and genetic stability

26
Q

how can you preserve bacterial cultures?

A

subculture of growing cells, snap-freeze cells in broth w/ cryopreservative, freeze-dry cells suspended in lyophilization media

27
Q

how do bacteria grow? (mitosis, meiosis, binary fission, etc.)

A

binary fission

28
Q

what is generation time?

A

time required for population to double

29
Q

Label the growth phases

A
30
Q

describe lag phase

A

no cell division, preparing for growth

31
Q

describe log (exponential) phase

A

exponential growth

32
Q

describe stationary phase

A

zero population growth

33
Q

describe death/decline phase

A

exponential death

34
Q

After decline phase what can some viable bacteria enter?

A

long-term stationary phase

35
Q

define colony

A

population arising from a single cell or spore, or from a group of cells of the same species or strain

36
Q

what is the difference between a batch culture and continuous culture?

A

batch culture - grow in closed system, exponential growth cannot be maintained
continuous culture - growth in chemostat, fresh medium continuously added, exponential growth can be maintained