Methods for the deprotection of pinanediol and pinacol esters of various boronic acids via fluoroborane intermediates were evaluated. Treatment of the boronate esters with potassium hydrogen difluoride normally gives trifluoroborate salts; in the case of alpha-amido alkyl or o-amido phenyl boronate esters, aqueous workup gives difluoroboranes. Procedures for transformation of both trifluorobora...

Sir, We read with great interest the recently published Teaching Point ‘The tell-tale urinary chloride’ w1x. While differential diagnosis of this intriguing case was properly managed, focusing on urinary chloride concentration and the coexisting metabolic alkalosis, the teaching points reported are not clearly stated. Concerning the first point: we should note that gastric losses were unlikely ...

We have previously shown that vanadium bromoperoxidase from Ascophyllum nodosum mediates production of the (R)-enantiomer of methyl phenyl sulfoxide with 91% enantiomeric excess. Investigation of the intrinsic selectivity of vanadium bromoperoxidase reveals that the enzyme catalyzes the sulfoxidation of methyl phenyl sulfide in a purely enantioselective manner. The K(m) of the enzyme for methyl...

An experiment was carried out SKUAST –K in two consecutive years (2016 and 2017) to study the effect of zinc boron their interaction on nutrient uptake onion soil properties onion. In it observed that sole levels, Z3 (7.500 kg Zn ha-1) B3 (1.500 B application proved superior enhancing all nutrients but exhibited lowest value case phosphorus uptake. It further applications increasing nutrients. ...

Sartorius muscles of R. pipiens may be enriched in sodium and depleted of potassium by prolonged soaking in the cold in K-free or low K Ringer's solution. Such K-depleted muscles take up potassium and extrude sodium when exposed to Ringer's solution containing 10 mM K at ordinary room temperature (ca. 20 degrees C), with no dependence on external Na ion concentration in either phase within fair...

As a first example of opening a secondary aziridine with a tertiary carbanion, the title amines (3a-c, aryl = phenyl, 4-tert-butylphenyl,2-naphthyl) were synthesized by opening N-(diphenylphosphinoyl)-7-azabicyclo[4.1.0]heptane, aziridine 1, with the corresponding alpha-potassium isopropylarenes, followed by a hydrolysis of the resulting phosphinamides 2a-c.

Boron toxicity is a world-wide problem for crops, yet we have limited understanding of the genetic responses and adaptive mechanisms to this stress in plants. We employed cross-species comparison between boron stress-sensitive Arabidopsis thaliana its stress-tolerant extremophyte relative Schrenkiella parvula, multi-omics approach integrating genomics, transcriptomics, metabolomics ionomics ass...

introduction: boron (b) is an essential plant micronutrient whose soil availability is influenced by many soil factors.understanding the processes controling activity of boron (b) in the soil solution is important for soil fertility management. the reaction of adsorption and desorption of boron in soil determines the amount of boron that is available to plants. adsorption–desorption processes p...

In the course of a comparative study of several methods for the determination of sugar in blood, the results of which will be recorded elsewhere, it became desirable to investigate the reaction betsveen copper sulfate and potassium iodide which is concerned in a number of methods for sugar determination (Bang (l), Maclean (2), Scales (3), Lehmann (4), Riegler (4), Peters (4), Kendall (5)). In c...