A practical synthesis of 1-bromo-2-amino-3-butene derivatives from homoallylic trichloroacetimidates was reported. Simply heating the mixture of substrates and N-bromoacetamide in DMF at 90 °C would give the desired products in moderate to excellent yields. The reaction may proceed through a domino bromo-cyclization and elimination pathway. The synthesis of 4,5-dihydrooxazoles from 1-bromo-2-am...

We evaluated the inducibility of nitrate-dependent Fe(II)-EDTA oxidation (NDFO) in non-growth, chloramphenicol-amended, resting-cell suspensions of Dechloromonas sp. strain UWNR4 and Acidovorax sp. strain 2AN. Cells previously incubated with Fe(II)-EDTA oxidized ca. 6-fold more Fe(II)-EDTA than cells previously incubated with Fe(III)-EDTA. This is the first report of induction of NDFO by Fe(II).

The study was conducted to investigate the effects of ethylenediaminetetraacetic acid (EDTA) on seedling emergence, morphological characteristics, and photosynthetic pigments of Chenopodium album (L.) in lead (Pb) contaminated soil. The Pb contaminated soils were taken from Hirmand River. The soil samples mixed with 0.71 g Li-1 Pb (PbNO3)2 to increase the Pb concentration. EDTA was added to the...

When perfused internally through crayfish giant axons, pronase removed sodium inactivation more than three times as fast at -100 mV as compared with -30 mV. N-bromoacetamide, applied internally, removed sodium inactivation twice as fast at -100 mV as at -30 mV, and the relative rate of removal declined with membrane depolarization in proportion to steady-state sodium inactivation. We conclude t...

We have trapped elongation factor G (EF-G) from Escherichia coli in six, functionally defined states, representing intermediates in its unidirectional catalytic cycle, which couples GTP hydrolysis to tRNA-mRNA translocation in the ribosome. By probing EF-G with trypsin in each state, we identified a substantial conformational change involving its conserved switch I (sw1) element, which contacts...

Festuca ovina L. is a hyperaccumulating plant which has aroused considerableinterest with respect to its possible use for phytoremediation of contaminated soils. Thisstudy has been conducted to evaluate the potentials of F. ovina L. to serve as aphytoremediation plant in the cleaning up of Cu in the polluted soils and to identifyextraction efficiency of Ethylene Diamine Tetraacetic Acid (EDTA) ...

OBJECTIVE The objective of this study was to evaluate the effect of 8% and 17% ethylenediaminetetraacetic acid (EDTA) exposure for 1 min and 10 min on the fracture resistance of endodontically treated roots. METHODOLOGY Sixty human single-rooted teeth were decoronated and divided into six groups (n = 10). Canal preparation was carried out except in negative control group, using the ProTaper r...

Abstract Ethylenediaminetetraacetic acid disodium (EDTA) can form stable complexes with many metals. To improve the leaching rate of gold and consumption thiosulfate, EDTA ammonia were combined copper ions to a copper-EDTA-ammonia-thiosulfate system. Electrochemical methods used study effect ion, EDTA, polarization voltage. The results showed that increasing concentrations ions, promoted dissol...

festuca ovina l. is a hyperaccumulating plant which has aroused considerableinterest with respect to its possible use for phytoremediation of contaminated soils. thisstudy has been conducted to evaluate the potentials of f. ovina l. to serve as aphytoremediation plant in the cleaning up of cu in the polluted soils and to identifyextraction efficiency of ethylene diamine tetraacetic acid (edta) ...