… sites did not correlate well with geographic distance between them (R 2 = 0.2). … Rippka
R., Deruelles J., Waterbury J., Herdman M., Stanier R., Generic assignments, strain … Potrafka …

… correlated positively with the sand content of soils (R 2 … 3a), and negatively with the
percentage of silt (R 2 … showed a better correlation with total extracellular carbohydrates (R 2 …

Biological soil crusts (BSCs) are key components of ecosystem productivity in arid lands
and they cover a substantial fraction of the terrestrial surface. In particular, BSC N 2 -fixation …

… Ruth M Potrafka … Chen R: Measurements of absolute values in biochemical fluorescence
… Noiva R: Enzymatic catalysis of disulfide formation. Protein Expr Purif. 1994, 5 (1): 1…

A novel isolate, CP153-2 T , was obtained from topsoil biological crusts in the Colorado
Plateau (USA). Colonies were black in colour due to melanin-like pigments when grown on …

A drought- induced massive shrub death event was observed in a semi-arid region of the
Negev Desert, leaving bare soil mounds in place. Hypothesizing that the absence of shrubs …

… Values for R H , [H 2 ] M , and T R for each strain have been gathered in Table 2. … Isolation
of strains from desert and their 16s gene amplification was carried out by Ruth Potrafka. …