Treatment of spinach chloroplasts with 4% Triton X-100 yields fragments which are separable by centrifugation. In the medium used (which is 4% in Triton X-100 and 0.5 M in sucrose) for the initial incubation particles sedimented by centrifugation at 144,000 X g for 1, 3, and 8 hours are relatively inactive in the partial photoreactions representative of photosynthesis. These particles contain a...

The natural food color gardenia red is manufactured through the hydrolysis of the methyl ester of iridoid glucoside. Gardenia blue is also made from iridoid glucoside. Therefore, there is a possibility that the commercial products contain methanol. To determine methanol in gardenia red and gardenia blue, a headspace GC method with standard addition was developed. In the case of gardenia blue wi...

The far ultraviolet rays are harmful to human health, particularly for their mutagenic effects; it can cause skin cancer, cataracts, photochemical pollution. In the future, chemists plan use as weapons destruction of objects. Therefore, we should meet this future challenge by scientific means in order snuff out its far-ultraviolet rays. paper, we’ve intend carry a deep spectral study on series ...

conclusions the study results demonstrated that undergraduate prosthodontics students in their last two years of study had an average knowledge of working with methyl methacrylate. therefore, health education should focus more on working with dentistry substances, in order to enhance the knowledge level of the targeted students. results the mean level of individuals’ knowledge in regard to work...

The oxygenated derivatives of fatty acids, known as oxylipins, are pivotal signaling molecules in animals and terrestrial plants. In animal systems, eicosanoids regulate cell differentiation, immune responses, and homeostasis. In contrast, terrestrial plants use derivatives of C18 and C16 fatty acids as developmental or defense hormones. Marine algae have emerged early in the evolution of eukar...

The aim of this study was investigation of prevention of thermal degradation of the red currant juice anthocyanins by addition of different phenolic compounds (catechol, 4-methyl catechol, catechin, chlorogenic acid and gallic acid). Phenolic compounds were added in 50:1 and 100:1 copigment:pigment molar ratio. Red currant juice samples were heated at 30, 50, 70 and 90 °C for 1 hour. Thermal de...

nano-cus powders were synthesized with chemical solution method. xrd and sem and spectrophotometry were used for characterization of the cus powders. xrd analysis indicated that tetragonal cus was the main phase with particle size of 16.2nm and little cu2s phase was present. scanning electron microscopy (sem) analysis revealed that powder was plate like and had very little aspect ratio in morph...

A novel method capable of differentiating and concentrating small molecules in bulk solution termed "electrophoretic exclusion" is described and experimentally investigated. In this technique, the hydrodynamic flow of the system is countered by the electrophoretic velocity to prevent a species from entering into the channel. The separation can be controlled by changing the flow rate or applied ...

The methyl&ion of histones was studied in mature and immature red cells of the duck. Histone Fractions I, II, III-IV, and V were prepared from cells which had been incubated in the presence of L-methionine-(methyl-3H). The histones were hydrolyzed in acid and the digests were chromatographed on an amino acid analyzer under conditions which have been shown to resolve the methyl derivatives of ly...

The development of a new intrinsic optical probe of protein structure and dynamics, Nl-methyl-7azatryptophan (1M7AT), is reported. The utility of this nonnatural amino acid derivative lies in its singleexponential, long-lived fluorescence decay (21.7 f 0.4 ns) and in its high fluorescence quantum yield (0.53 f 0.07). Its absorption and emission maxima are red-shifted 10 and 65 nm, respectively,...