Cytochrome P-450 (P-450)-catalyzed oxidation of 2,6-dimethyl-4-phenyl-3,5-pyridinedicarboxylic acid diethyl ester gives rise to 2,6-dimethyl-4-phenyl-3,5-pyridinedicarboxylic acid monoethyl ester and to 2-hydroxymethyl-6-methyl-4-phenyl-3,5-pyridinedicarboxylic acid diethyl ester, identified in this work. A pyridine hydroxymethyl diester of the sort of the latter compound is novel; under acidic...

Two modified methods for assaying sodium diclofenac were developed by GC and HPLC. Diclofenac was converted into methyl ester derivative by methyl iodide in acetone. The ester was extract and subjected to GLC with flame ionization detector. %5 SE-30/chrom W-HP (80-100 mesh) was used as a column in GC. For reversed phase HPLC, the mobile phase was methanol and water (55-45). The separation was p...

We have isolated glutamic acid 5-methyl ester from an Escherichia coli protein that is involved in chemotaxis. The bacteria were first incubated with [methyl-3H]methionine under conditions which are known to result in methylation of the protein. The protein, isolated by gel electrophoresis, was then digested by successive treatment with three proteolytic enzymes. One of the products was [methyl...

In recent years the growing concern about environmental changes and how we are using the natural resources have triggered a search for natural products as alternatives to synthetic pesticides. The stink bugs produce a wide variety of chemical compounds (semiochemicals) that show potential to manage these insects. The stink bugs Chinavia impicticornis (Stål), C. ubica (Rolston), Dichelops melaca...

The objective of this research was to evaluate the efficacy of various pre-emergence (PRE) and post-emergence (POST) herbicides for the control of volunteer adzuki bean (Vigna angularis (Willd.) Ohwi & Ohashi) in soybean (Glycine max L.). Trials were conducted at two locations in 2005, 2006, 2007, and 2009. Experiments were arranged in a randomized complete block design with either five PRE or ...

Male antennae of Phyllophaga tristis (Fabricius) (Coleoptera: Scarabaeidae: Melolonthinae) were tested using a coupled gas chromatograph-electroantennogram detector (GC-EAD) system for electrophysiological responses to five sex pheromones identified from other Phyllophaga species including L-valine methyl ester, L-isoleucine methyl ester, L-leucine methyl ester, methyl 2(methylthio)benzoate and...

In this study, we conducted an efficient microwave-assisted transesterification process combining homogeneous and heterogeneous catalytic phases to produce biodiesel from waste soybean oil. A cylindrical quartz reactor packed with nanoparticles of Fe3O4 as a co-catalyst was applied improve the reaction. The carried out methanol-to-oil molar ratio 6:1, power 560 W, residence time 30 s. specifica...

The effect of orally administered prostaglandin E(2) and its synthetic 15-methyl analogues on gastric secretion in man was studied. The parent E(2) compound did not inhibit basal secretion, whereas both the 15 (S) 15-methyl-E(2) methyl ester and its isomer, 15 (R) 15-methyl-E(2) methyl ester inhibited basal acid secretion. This action is likely to be a direct one on the parietal cell, and it co...

The reaction of [4-g1utamic acidjdeamlnc-l-carba-oxytocin (lb) with diazoalkanes yielded the corresponding methyl ester Ie and ethyl ester ld. Alternatively, the methyl ester was prepared by means of carbodiimide or thionyl chloride, or by treating the caesium salt of compound Ib with methyl iodide. [2-0~Methyltyrosine, 4-glutamic acid methyl esterjdeamino-f-carba-oxytccin (liz) was also synthe...