Avtor/Urednik		Kogej, Tina
Naslov		Fiziološke prilagoditve halofilne črne kvasovke Hortae werneckii na rast v slanem okolju na ravni celične stene in kopičenja kompatibilnih topljencev
Prevedeni naslov		Physiological adaptations of halophilic black yeast Hortaea werneckii to growth at saline conditions on the levels of cell wall and accumulation of compatible solutes
Tip		monografija
Kraj izdaje		Ljubljana
Založnik		Univerza v Ljubljani, Medicinska fakulteta
Leto izdaje		2006
Obseg		str. 196
Jezik		slo
Abstrakt		Hypersaline waters of solar salterns represent an extreme environment, where microorganisms of all three kingdoms - Archaea, Bacteria and Eukaryotes - live despite the high osmotic pressure. Their common characteristic is the capability of physiological adaptation to different concentrations of osmotically active substances in their aquatic environment. It has been known since 1997 that halophilic and halotolerant fungi are among the rare eukaryotes living in this extreme environment. The halophilic black yeast Hortaea werneckii with its natural ecological niche in hypersaline waters is a model organism for studies of eukaryotic adaptations to saline environment. The particular characteristic of H. werneckii in comparison to halophilic bacteria is its capability of growth without NaCI as well as within a wide range of salinity, which includes all concentrations up to almost saturated solution of NaCI (30% w/v). Since only a few eukaryotic halophilic microorganisms were known until now, H. werneckii is very suitable for the research of different adaptations. Among the most important physiological adaptations to life in saline environment are the appropriate modifications in the cell wall and membrane, and the regulation of osmotic potentials between the exterior environment and interior of the cell. This is achieved either through accumulation of cations (K+), or through synthesis and accumulation of small organic molecules in the cytoplasm, which act as osmolytes. These are the so-called compatible solutes, which do not interfere with metabolism even when present in high concentration. It has already been discovered that the cells of H. werneckii accumulate glycerol in accordance with the increase of salinity, but only until the salinity reaches 10%, at which point the intracellular concentration of glycerol ceases to increase. (Abstract truncated at 2000 characters)
Deskriptorji		YEASTS SODIUM CHLORIDE ECOSYSTEM ADAPTATION, PHYSIOLOGICAL GLYCERIN SODIUM POTASSIUM OSMOTIC PRESSURE MELANINS CHROMATOGRAPHY, HIGH PRESSURE LIQUID SPECTROPHOTOMETRY, ATOMIC ABSORPTION