Nutritional and environmental conditions were characterized for a batch culture of the marine dinoflagellate Alexandrium tamarense HK9301 isolated from the South China Sea for its growth (cells ml ), cellular toxin content (Qt in fmol cell ) and toxin composition (mol%). Under a nutrient replete condition, Qt increased with cell growth and peaked at the late stationary phase. Toxin content incr...

Glutamine synthetase, purified from rat liver, is homogeneous on acrylamide gel electrophoresis and on ultracentrifugation (~20,~) 15.0 S). The enzyme, which consists of eight subunits (subunit molecular weight, 44,000), resembles ovine brain glutamine synthetase in its physical properties, amino acid composition, and substrate specificity. Complete inhibition of the liver enzyme by methionine ...

Abstract The article presents various methods of heat-resistant materials synthesis on the basis aluminosilicate wastes expanded clay production. Researches have shown that application physical and chemical in course studying claydite dust composition, structure properties makes it possible to define reason thermal parameters increase binders prepared its composition. investigates influence ref...

A one-pot, fully water-based synthesis of blue- and red-emitting C-dots is presented. To this concern, [ZrO]2+[F6P]2− [Eu(OH)]2+[F6P]2− precursor nanoparticles (F6P: D-fructose-6-phosphate) are prepared in water converted to C-dot@[ZrO]2+[HPO4]2− C-dot@[Eu(OH)]2+[HPO4]2− composite boiling (100 °C) via microwave heating. Composition, structure, fluorescence the validated by different analytical ...

This study tests the hypothesis that surface composition influences microbial community structure and growth of biofilms. We used laboratory biofilm reactors (inoculated with a diverse subsurface community) to explore the phylogenetic and taxonomic variability in microbial communities as a function of surface type (carbonate, silicate, aluminosilicate), media pH, and carbon and phosphate availa...

Calcium phosphate cements (CPCs) were prepared using mixtures of tetracalcium phosphate (TTCP) and dicalcium phosphate anhydrous (DCPA), with TTCP/DCPA molar ratios of 1/1, 1/2, or 1/3, with the powder and water as the liquid. Diametral tensile strength (DTS), porosity, and phase composition (powder x-ray diffraction) were determined after the set specimens have been immersed in a physiological...

There is potential for Raman spectroscopy (RS) to complement tools for bone diagnosis due to its ability to assess compositional and organizational characteristics of both collagen and mineral. To aid this potential, the present study assessed specificity of RS peaks to the composition of bone, a birefringent material, for different degrees of instrument polarization. Specifically, relative cha...