نتایج جستجو برای: boron toxicity

تعداد نتایج: 135738  

Journal: :Science 2015
Andrew J Mannix Xiang-Feng Zhou Brian Kiraly Joshua D Wood Diego Alducin Benjamin D Myers Xiaolong Liu Brandon L Fisher Ulises Santiago Jeffrey R Guest Miguel Jose Yacaman Arturo Ponce Artem R Oganov Mark C Hersam Nathan P Guisinger

At the atomic-cluster scale, pure boron is markedly similar to carbon, forming simple planar molecules and cage-like fullerenes. Theoretical studies predict that two-dimensional (2D) boron sheets will adopt an atomic configuration similar to that of boron atomic clusters. We synthesized atomically thin, crystalline 2D boron sheets (i.e., borophene) on silver surfaces under ultrahigh-vacuum cond...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1387

boron nitride semiconducting zigzag swcnt, $b_{cb}$$n_{cn}$$c_{1-cb-cn}$, as a potential candidate for making nanoelectronic devices was examined. in contrast to the previous dft calculations, wherein just one boron and nitrogen doping configuration have been considered, here for the average over all possible configurations, density of states (dos) was calculated in terms of boron and nitrogen ...

Journal: :Anticancer research 2003
Yasushi Shibata Akira Matsumura Tetsuya Yamamoto Hiroyoshi Akutsu Susumu Yasuda Kei Nakai Tadao Nose Kazuyoshi Yamamoto Hiroaki Kumada Naohiko Hori Shinichi Ohtake

BACKGROUND In boron neutron capture therapy, blood boron concentration is the key factor to calculate radiation dose, however, blood sampling is difficult during neutron irradiation. MATERIALS AND METHODS The prediction of blood boron concentrations for BNCT treatment planning has been prospectively investigated using patient data obtained at first craniotomy after the infusion of a low dose ...

2015
M. Cusack N. A. Kamenos C. Rollion-Bard G. Tricot

Reconstructing pH from biogenic carbonates using boron isotopic compositions relies on the assumption that only borate, and no boric acid, is present. Red coralline algae are frequently used in palaeoenvironmental reconstruction due to their widespread distribution and regular banding frequency. Prior to undertaking pH reconstructions using red coralline algae we tested the boron composition of...

2017
Kha L. Tu Allan R. Chivas Long D. Nghiem

Boron rejection by nanofiltration (NF) and reverse osmosis (RO) membranes in the presence of glycerol, mannitol and sorbitol was investigated as a function of feed solution pH and boron:polyol molar ratio. In the presence of polyols, significant boron rejection improvement was obtained and the extent of the impact was directly related to the stability constant of the boron-polyol complex. Polyo...

2008
Margaret C. Gentz J. Kenneth Grace Mark E. Mankowski

The goal of the present study was to determine whether Coptotermes formosanus Shiraki workers exposed to boron-treated wood were capable of transferring quantifiable amounts of boron to non-exposed nestmates. This effect is called horizontal transfer. Borates are not repellent to termites, nor do they cause rapid mortality, making them excellent candidates for the study of horizontal transfer. ...

Journal: :Environmental Health Perspectives 1994
F H Nielsen

Boron deprivation experiments with humans have yielded some persuasive findings for the hypothesis that boron is an essential nutrient. In the first nutritional study with humans involving boron, 12 postmenopausal women first were fed a diet that provided 0.25 mg boron/2000 kcal for 119 days, and then were fed the same diet with a boron supplement of 3 mg boron/day for 48 days. The boron supple...

Journal: :Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements 2009
Forrest Harold Nielsen

Two experiments were conducted with weanling Sprague-Dawley rats to determine whether changes in S-adenosylmethionine utilization or metabolism contribute to the diverse responses to boron deprivation. In both experiments, four treatment groups of 15 male rats were fed ground corn-casein based diets that contained an average of 0.05 mg (experiment 1) or 0.15 mg (experiment 2) boron/kg. In exper...

2012
Jiling L Li Tao He Guowei Yang

More recently, motivated by extensively technical applications of carbon nanostructures, there is a growing interest in exploring novel non-carbon nanostructures. As the nearest neighbor of carbon in the periodic table, boron has exceptional properties of low volatility and high melting point and is stronger than steel, harder than corundum, and lighter than aluminum. Boron nanostructures thus ...

Background & Aims: Drugs are highly active due to their many functional groups and can be easily destroyed by stomach acid and excreted before reaching target tissue. Thus, by encapsulating, a sheath is placed around drug to reduce reactivity of the drug due to stereo electronic resonance with nanotube and consequently drug stays longer in body. As a result, you can consume a smaller dose of dr...

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