Oceanic dissolved organic matter (DOM) is an assemblage of reduced carbon compounds, which results from biotic and abiotic processes. The biotic processes consist in either release or uptake of specific molecules by marine organisms. Heterotrophic bacteria have been mostly considered to influence the DOM composition by preferential uptake of certain compounds. However, they also secrete a varie...

A mutant of Escherichia coli K-12 defective in 1-acyl-sn-glycerol-3-phosphate acyltransferase has been isolated. At the permissive temperature for growth, 30 degrees C, 20% of the total cellular glycerophospholipids is 1-acyl-sn-glycerol-3-phosphate, as identified by mass spectral analysis and proton NMR. This percentage of 1-acyl-sn-glycerol-3-phosphate rises to about 30% when the temperature ...

The possible involvement of mutarotases in glucose metabolism has been studied by examining the anomeric specificities of a number of glycolytic enzymes. Hexokinases from yeast or Ehrlich ascites tumor cells showed only a marginal preference for the cx anomer of glucose. (All configurations, unless otherwise specified, refer to the D configuration of glucose and its derivatives.) The K, values ...

phosphorus (p) is one of the most vital elements for all living organisms which acts as aconstituent of essential biomolecules such as nucleic acids, phospholipids, and phosphosugars,and as a major contributor to almost all metabolic reactions including photosynthesis,respiration, and energy delivery. it is one of the most needed nutrients for plant growth anddevelopment. despite high levels of...

In this paper, we report the preparation of nickel phosphate in aqueous solution and its use as inorganic pigment. Because cerium phosphate is insoluble in acidic and basic solution, the addition of cerium was tried to improve the acid and base resistance of nickel phosphate pigment. The cerium substituted nickel phosphates were prepared from phosphoric acid, nickel nitrate, and ammonium cerium...

Recent experimental evidence suggests that octacalcium phosphate (OCP) is a necessary precursor to hydroxyapaptite in the amorphous-crystalline transformation that occurs after the spon..: taneous precipitation of calcium phosphate in the pH range 7.00-9.25. The transformation appears to occur by heterogeneous nucleation of OCP by the initially formed amorphous calcium phosphate (ACP) phase. AC...