Microbial physiology and ecology of slow growth

Article Abstract:

Cells have evolved uptake capabilities that allow growth when nutrient concentrations outside the cell are at very low levels. The cell may not be able to metabolize substrate rapidly though concentrations are high, so the cell has to control its uptake capabilities. The impact of varying substrate levels can be studied using a computer simulation. Too much nutrient can lead to cell death for different reasons, while too little nutrient can lead to attempts to set up molecular syntheses that the cell cannot finish.

Cells (Biology), Growth, Cells

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Signal transduction and transcriptional and posttranscriptional control of iron-regulated genes in bacteria

Article Abstract:

Most living cells need iron, and they have to be able to scavenge iron when it is scarce. Expression of genes regulated by iron is controlled in more complex ways than was initially realized. A number of bacteria can be studied to examine iron scavenging, such as Escherichia coli, and Vibrio cholerae. An examination of these different species can provide a unifying picture of how scavenging mechanisms work and the relevance they have to bacteria occupying specific ecological niches.

Research, Escherichia coli, Vibrio cholerae

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Biogenesis of respiratory cytochromes in bacteria

Article Abstract:

Postranslational processes are needed for the assembly of heme, apoprotein and other cofactors so that they become mature enzyme complexes. This is known as biogenesis of respiratory cytochromes. A number of biochemical reactions occur when maturation is taking place, and they include proteolytic processing, and translocation of heme. Heme covalent attachment seems to use enzymes as catalysts. Cytochrome c is the case of maturation that has been studied the most.

Cytochemistry

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