نتایج جستجو برای: aqueous conditions
تعداد نتایج: 922629 فیلتر نتایج به سال:
Abstract Organometallic allylic reagents are widely used in the construction of C−C bonds by Barbier‐type reactions. In this communication, we have described a photoredox Barbier allylation aldehydes mediated bismuth, absence other metals as co‐reductants. Mild reaction conditions, tolerance oxygen, and use aqueous solvent make methodology attractive for green sustainable synthesis homoallylic ...
an environmentally benign and clean synthesis of aryl-hydrazones by reacting variety of carbonyl compounds with thiosemicarbazide, semicarbazide, aminoguanidine, and phenyl hydrazine has been achieved using aqueous extract of acacia concinna pods as a natural surfactant type catalyst. we found that the aqueous extract of acacia concinna pods could be effectively used for the synthesis of aryl-h...
IF it is granted that the aqueous humour is formed by the active transfer of solutes and solvent from the plasma to the aqueous, it follows that the rates of transfer of the various solvent or solute species and the steady-state composition of the aqueous will depend upon the electrochemical potential difference (P.D.) across its boundaries with the plasma. Alterations of the electrochemical P....
Regioselective S-acylation of coenzyme A (CoA) is achieved under aqueous conditions using various aliphatic and aromatic carboxylic acids activated as their methyl acyl phosphate monoesters. Unlike many hydrophobic activating groups, the anionic methyl acyl phosphate mixed anhydride is more compatible with aqueous solvents, making it useful for conducting acylation reactions in an aqueous medium.
Standard partial molal thermodynamic parameters for the aqueous chlorinated-ethylene species, perchloroethylene (PCE), trichloroethylene (TCE), 1,1-dichloroethylene (1,1-DCE), cis-1,2-dichloroethylene (cis-1,2-DCE), trans-1,2-dichloroethylene (trans-1,2,-DCE), and vinyl chloride (VC) have been estimated by using experimental gas-solubility data and correlation algorithms. The provided thermodyn...
It has recently been shown that aqueous humor is able to obstruct flow through Nuclepore polycarbonate filters having flow dimensions similar to those found in the juxtacanalicular tissue (JCT). We undertook studies designed to identify the component(s) of aqueous humor responsible for this obstruction and to determine the mechanism of blockage. We conclude that aqueous humor contains two compo...
The penetration of rifampin into human aqueous humor was determined in 15 patients undergoing elective cataract surgery. Between 0.9 and 5.5 h after administration of a single 600-mg oral dose, concentrations ranged from 6.0 to 21.5 mg/liter in serum and from less than 0.2 to 1.3 mg/liter in aqueous humor.
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