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chemostat

An apparatus allowing the continuous cultivation of bacterial populations in a constant, competitive environment. Bacteria compete for a limiting nutrient in the medium. The medium is ...

chemostat

chemostat   Quick reference

A Dictionary of Genetics (8 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
113 words

... an apparatus allowing the continuous cultivation of bacterial populations in a constant, competitive environment. Bacteria compete for a limiting nutrient in the medium. The medium is slowly added to the culture, and used medium plus bacteria are siphoned off at the same rate. The concentration of the limiting nutrient in the fresh medium determines the density of the steady-state population, and the rate at which the medium is pumped into the chemostat determines the bacterial growth rate. In chemostat experiments, environmental variables can be...

chemostat

chemostat   Quick reference

A Dictionary of Biomedicine (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...chemostat An apparatus in which a bacterial population can be maintained in the exponential phase of growth by regulating the input of a rate-limiting nutrient and the removal of exhausted medium and cells....

chemostat

chemostat   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
86 words

... a device for the continuous culture of bacterial (and other) cells. Growth occurs in an aerated fermenter vessel and its rate is controlled by the rate of addition of fresh nutrient from a reservoir (i.e. the dilution rate); this in turn controls the rate of removal of cells (and culture medium). In a chemostat, as opposed to an auxostat , the dilution rate is constant. At equilibrium, the rate of production of new cells by multiplication is equal to the rate of removal of grown...

chemostat

chemostat noun   Quick reference

New Oxford American Dictionary (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
41 words
chemostat

chemostat noun   Quick reference

Oxford Dictionary of English (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
41 words
chemostat

chemostat noun   Reference library

Australian Oxford Dictionary (2 ed.)

Reference type:
English Dictionary
Current Version:
2004
Subject:
English Dictionaries and Thesauri
Length:
31 words
chemostat

chemostat  

An apparatus allowing the continuous cultivation of bacterial populations in a constant, competitive environment. Bacteria compete for a limiting nutrient in the medium. The medium is slowly added to ...
auxostat

auxostat  

In industrial fermentation, a chemostat in which the dilution rate can be varied, normally in response to some parameter such as growth rate or pH, so that growth rate is more readily maximized.[...]
dilution rate

dilution rate  

symbol: D; the rate, F, at which existing medium is replaced with fresh medium in a continuous culture, divided by the volume, V, of the culture: D = F/V. Under ...
continuous culture

continuous culture  

A technique used to grow microorganisms or cells continually in a particular phase of growth. For example, if a constant supply of cells is required, a cell culture maintained in the log phase is ...
continuous culture

continuous culture   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
23 words

...culture any cell culture in which the cells are in the growth phase over a prolonged period of time. See also chemostat...

auxostat

auxostat   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
34 words

...in industrial fermentation, a chemostat in which the dilution rate can be varied, normally in response to some parameter such as growth rate or pH, so that growth rate is more readily...

dilution rate

dilution rate   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
50 words

... F , at which existing medium is replaced with fresh medium in a continuous culture , divided by the volume, V , of the culture: D = F / V . Under steady‐state conditions the dilution rate numerically equals the specific growth rate of the culture. See also auxostat , chemostat...

continuous cultivation

continuous cultivation   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014

...growth of the microorganisms within the bioreactor. The volume of the bioreactor can be kept constant by an overflow weir arrangement. The dilution rate is used to characterize the operation which is defined as the ratio of the flow of feed to the volume of the bioreactor. Chemostat cultivation involves the continuous feed of substrate in which at least one nutrient is limiting. Turbidostat cultivation involves maintaining a constant biomass concentration by varying the dilution rate. ...

bioreactor

bioreactor   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014

...within the bioreactor may be in the form of a suspension of cells or immobilized, and depending on the living organism, operated aerobically or anaerobically. The mode of operation is batch, fed batch, or continuous. An example of a continuously operated bioreactor is the chemostat . Constant agitation within a bioreactor can be maintained with an appropriate stirrer which also aids oxygen transfer in aerobic processes. Low-speed impellers or the use of sparged air up draft tubes are typically used to aid mixing. Since all bioprocesses are exothermic, cooling...

Szilard, Leo

Szilard, Leo   Quick reference

A Dictionary of Scientists

Reference type:
Subject Reference
Current Version:
2003
Subject:
Science and technology
Length:
484 words

...on his work in physics he moved, after the war, into molecular biology. Szilard took his new subject seriously, attending classes at the Cold Spring Harbor laboratories in 1946 . He was soon to develop a high degree of competence, designing an important new instrument, the chemostat, formulating new theories on the aging process, and stimulating Jacques Monod in his work on the operon and the...

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