halophiles require salt in high concentrations for growth.
halophiles require salt in high concentrations for growth.
halophiles require what in high concentrations for growth?
salt
section::::classification.









































halophiles are categorized as slight, moderate, or extreme, by the extent of their halotolerance. slight halophiles prefer 0.3 to 0.8 m (1.7 to 4.8%—seawater is 0.6 m or 3.5%), moderate halophiles 0.8 to 3.4 m (4.7 to 20%), and extreme halophiles 3.4 to 5.1 m (20 to 30%) salt content. halophiles require sodium chloride (salt) for growth, in contrast to halotolerant organisms, which do not require salt but can grow under saline conditions.









































section::::lifestyle.
halophile
surveys of human exposure to chemicals do not usually integrate the number of chemical compounds detected per person and the concentration of each compound. this leaves untested relevant exposure situations; e.g., whether individuals with low concentrations of some compounds have high concentrations of the other compounds. analyses of the concentrations of a given compound usually show that most citizens have much lower concentrations than a certain minority. a study based on a representative sample of the population of catalonia (spain), which integrated the number of compounds detected per person and the concentration of each compound, found that more than half of the population had concentrations in the top quartile of 1 or more of the 19 persistent toxic substances (pts) (pesticides, pcbs) analyzed. significant subgroups of the population accumulated pts mixtures at high concentrations. for instance, 48% of women 60–74 years had concentrations of 6 or more pts in the top quartile; half of the entire population had levels of 1 to 5 pts above 500 ng/g, and less than 4% of citizens had all pts in the lowest quartile. thus, pts concentrations appear low in most of the population only when each individual compound is looked at separately. it is not accurate to state that most of the population has low concentrations of pts. the assessment of mixture effects must address the fact that most individuals are contaminated by pts mixtures made of compounds at both low and high concentrations.
biomonitoring