A receptor for fluid phase human complement (C) components C3 and C3b (1, 2) was found on the surface membranes of human lymphoblastoid cells. No other C proteins or serum factors were needed to mediate binding of C3 or C3b to this receptor. In studying its biological importance, we demonstrated that Raji cells cultured in medium containing fresh normal human serum (NHS) 1 and cobra venom facto...

A receptor for fluid phase human complement (C) components C3 and C3b (1, 2) was found on the surface membranes of human lymphoblastoid cells. No other C proteins or serum factors were needed to mediate binding of C3 or C3b to this receptor. In studying its biological importance, we demonstrated that Raji cells cultured in medium containing fresh normal human serum (NHS) 1 and cobra venom facto...

The expansion of soybean (Glycine max (L.) Merr) acreage, increasing yields, and recent nitrogen (N) fertilization recommendations could have a major effect on the contribution of biological N fixation (BNF) in soybeans to reactive nitrogen (Nr) in the environment. We used N natural abundance to separate fixed N into grain, aboveground vegetative biomass, and roots along a 9-point N-fertilizer ...

To investigate the input of combined nitrogen by cyanobacteria in mangrove ecosystems and the seasonal fluctuation of this biological process, in situ nitrogen fixation activity was measured in day and night experiments carried out at Maruhubi mangrove ecosystem adjacent to Zanzibar town. Sampling was done for 12 months at two stations: Station I covering sandy sediments and Station II muddy se...

The objectives of this study were to count and culture Azotobacter spp. in sampled soils, to determine the nitrogen (N) fixing capacity byAzotobacter spp. in pure culture and different soils, and to explore the relationships between N fixation capacity of Azotobacter spp. and microbiological properties of soils in Northern Anatolia, Turkey. Statistically significant relationships were found bet...

Abstract Biological nitrogen fixation (BNF) can help replenish available (N) in cropland and reduce the use of chemical N fertilizers, with diazotrophs playing an important role. However, response diazotroph community BNF activity biochar amendment soil, especially deep soil horizon, are poorly understood. In this study, samples were collected from topsoil (0–20 cm) subsoil (20–40 field experim...

The effects of pH, trypsin, and phospholipase C on the topographic distribution of acidic anionic residues on human erythrocytes was investigated using colloidal iron hydroxide labeling of mounted, fixed ghost membranes. After glutaraldehyde fixation at pH 6.5-7.5, the positively charged colloidal particles were bound to the membranes in small randomly distributed clusters. The clusters of anio...