Science Progress articles from March 2003

Science Progress archives from March 2003

Temperature effects on biological systems: Introduction.
March 22, 2003... This issue begins with an excellent and comprehensive article on cold-shock responses by Weber and Marahiel (1). These authors review in detail the changes which occur on transfer of bacteria to low temperatures, with major sections on...

Bacterial cold shock responses.
March 22, 2003... As a measure for molecular motion, temperature is one of the most important environmental factors for life as it directly influences structural and hence functional properties of cellular components. After a sudden increase in ambient...

Water or ice? -- the challenge for invertebrate cold survival.
March 22, 2003... The ecophysiology of cold tolerance in many terrestrial invertebrate animals is based on water and its activity at low temperatures, affecting cell, tissue and whole organ ism functions. The normal body water content of invertebrates varies...

Morphological changes to Escherichia coli O157:H7, commensal E. coli and Salmonella spp in response to marginal growth conditions, with special reference to mildly stressing temperatures.
March 22, 2003... Certain rod-shaped bacteria have been reported to from elongated filamentous cells when exposed to marginal growth conditions, including refrigeration temperatures. To expand upon these observations, the filamentation of commensal Escherichia...

Lethal effects of heat on bacterial physiology and structure.
March 22, 2003... High temperatures have profound effects on the structural and physiological properties of sporulating and non-sporulating bacteria, with membranes, RNA, DNA, ribosomes, protein and enzymes all affected. Nevertheless, it is apparent that no one...

Extracellular proteins as enterobacterial thermometers.
March 22, 2003... Biological thermometers are cellular components or structures which sense increasing temperatures, interaction of the thermometer and the thermal stress bringing about the switching-on of inducible responses, with gradually enhanced levels of...