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https://www.readbyqxmd.com/read/28812893/%C3%AE-sulfinyl-benzoates-as-precursors-to-li-and-mg-carbenoids-for-the-stereoselective-iterative-homologation-of-boronic-esters
#1
Giorgia Casoni, Murat Kucukdisli, James M Fordham, Matthew Burns, Eddie L Myers, Varinder K Aggarwal
The stereoselective reagent-controlled homologation of boronic esters is one of a small number of iteratable synthetic transformations that if automated could form the basis of a veritable molecule-making machine. Recently, α-stannyl triisopropylbenzoates and α-sulfinyl chlorides have emerged as useful building blocks for the iterative homologation of boronic esters. However, α-stannyl benzoates need to be prepared using stoichiometric amounts of the (+)- or (-)-enantiomer of the scarcely available and expensive diamine sparteine; also, these building blocks, together with the byproducts that are generated during homologation, are perceived as being toxic...
August 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28812578/throw-caution-to-the-wind-is-refeeding-syndrome-really-a-cause-of-death-in-acute-care
#2
K L Matthews, S M Capra, M A Palmer
BACKGROUND/OBJECTIVES: Refeeding syndrome (RFS), a life-threatening medical condition, is commonly associated with acute or chronic starvation. While the prevalence of patients at risk of RFS in hospital reportedly ranges from 0 to 80%, the prevalence and types of patients who die as a result of RFS is unknown. We aimed to measure the prevalence rate and examine the case histories of patients who passed away with RFS listed as a cause of death. SUBJECTS/METHODS: Patients were eligible for inclusion provided their death occurred within a Queensland hospital...
August 16, 2017: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28811866/preliminary-data-on-the-interaction-between-some-biometals-and-oxidative-stress-status-in-mild-cognitive-impairment-and-alzheimer-s-disease-patients
#3
Ioana-Miruna Balmuș, Stefan-Adrian Strungaru, Alin Ciobica, Mircea-Nicusor Nicoara, Romeo Dobrin, Gabriel Plavan, Cristinel Ștefănescu
Increased interest regarding the biometal mechanisms of action and the pathways in which they have regulatory roles was lately observed. Particularly, it was shown that biometal homeostasis dysregulation may lead to neurodegeneration including Alzheimer's disease, Parkinson disease, or prion protein disease, since important molecular signaling mechanisms in brain functions implicate both oxidative stress and redox active biometals. Oxidative stress could be a result of a breakdown in metal-ion homeostasis which leads to abnormal metal protein chelation...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28811523/strong-ductile-and-thermally-stable-bcc-mg-nanolaminates
#4
Siddhartha Pathak, Nenad Velisavljevic, J Kevin Baldwin, Manish Jain, Shijian Zheng, Nathan A Mara, Irene J Beyerlein
Magnesium has attracted attention worldwide because it is the lightest structural metal. However, a high strength-to-weight ratio remains its only attribute, since an intrinsic lack of strength, ductility and low melting temperature severely restricts practical applications of Mg. Through interface strains, the crystal structure of Mg can be transformed and stabilized from a simple hexagonal (hexagonal close packed hcp) to body center cubic (bcc) crystal structure at ambient pressures. We demonstrate that when introduced into a nanocomposite bcc Mg is far more ductile, 50% stronger, and retains its strength after extended exposure to 200 C, which is 0...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28810912/inhibition-of-trpm7-suppresses-cell-proliferation-of-colon-adenocarcinoma-in-vitro-and-induces-hypomagnesemia-in-vivo-without-affecting-azoxymethane-induced-early-colon-cancer-in-mice
#5
Junhao Huang, Hideki Furuya, Malika Faouzi, Zheng Zhang, Mahealani Monteilh-Zoller, F Kelly Galbraith Kawabata, David Horgen, Toshihiko Kawamori, Reinhold Penner, Andrea Fleig
BACKGROUND: Magnesium (Mg(2+)) is an essential cation implicated in carcinogenesis, solid tumor progression and metastatic potential. The Transient Receptor Potential Melastatin Member 7 (TRPM7) is a divalent ion channel involved in cellular and systemic Mg(2+) homeostasis. Abnormal expression of TRPM7 is found in numerous cancers, including colon, implicating TRPM7 in this process. METHODS: To establish a possible link between systemic magnesium (Mg(2+)) status, the Mg(2+) conducting channel TRPM7 in colon epithelial cells, and colon carcinogenesis, in vitro whole-cell patch clamp electrophysiology, qPCR, and pharmacological tools were used probing human colorectal adenocarcinoma HT-29 as well as normal primary mouse colon epithelial cells...
August 15, 2017: Cell Communication and Signaling: CCS
https://www.readbyqxmd.com/read/28806179/interpreting-magnesium-status-to-enhance-clinical-care-key-indicators
#6
Rebecca B Costello, Forrest Nielsen
PURPOSE OF REVIEW: To update advances in identifying factors affecting magnesium (Mg) status that assist in providing improved evidence-based clinical decision-making for assessing Mg status. RECENT FINDINGS: Findings from recent cohort studies, small randomized control trials, and multiple meta-analyses reinforce earlier work that serum Mg concentrations, urinary Mg excretion, and Mg dietary intakes are inversely associated with cardiovascular disease, chronic kidney disease, and diabetes...
August 12, 2017: Current Opinion in Clinical Nutrition and Metabolic Care
https://www.readbyqxmd.com/read/28806048/electrolytes-calcium-disorders
#7
Craig Barstow
A normal serum calcium level is 8 to 10 mg/dL. The diagnosis of hypercalcemia (ie, levels 10.5 mg/dL or greater) should be confirmed with an albumin-adjusted or ionized calcium level. The two most common causes of hypercalcemia are hyperparathyroidism and malignancy. Drugs, notably lithium and thiazide diuretics, also can cause hypercalcemia. Patients with severe or symptomatic hypercalcemia should be treated initially with hydration to decrease calcium levels. The evaluation should include a parathyroid hormone (PTH) level...
August 2017: FP Essentials
https://www.readbyqxmd.com/read/28803343/sediment-lipid-biomarkers-record-phytoplankton-dynamics-of-lake-heihai-yunnan-province-sw-china-driven-by-climate-warming-since-the-1980s
#8
Yongdong Zhang, Yaling Su, Zhengwen Liu, Jinlei Yu, Miao Jin
Increased phosphorus (P) export from sediments to the overlying water column is a significant factor driving the variation of phytoplankton in productivity and community structure in lakes. However, the lack of long-term instrumental data often impeded analyses attempting to associate dynamics of phytoplankton with variation of internal P loading. Here, elements and lipid biomarkers were analyzed in a sediment core from Lake Heihai, a small, deep, and ultraoligotrophic alpine lake in Haba Mountain, Yunnan Province, SW China...
August 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28803191/enhancing-recovery-of-magnesium-as-struvite-from-landfill-leachate-by-pretreatment-of-calcium-with-simultaneous-reduction-of-liquid-volume-via-forward-osmosis
#9
Simiao Wu, Shiqiang Zou, Guannan Liang, Guangren Qian, Zhen He
Landfill leachate contains substances that can be potentially recovered as valuable resources. In this study, magnesium in a landfill leachate was recovered as struvite with calcium pretreatment; meanwhile, the leachate volume was reduced by using a submerged forward osmosis (FO) process, thereby enabling significant reduction of further treatment footprint and cost. Without pretreatment, calcium exhibited strong competition for phosphate with magnesium. The pretreatment with a Ca(2+): CO3(2-) molar ratio of 1:1...
August 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28801773/growth-performance-mineral-digestibility-and-blood-characteristics-of-ostriches-receiving-drinking-water-supplemented-with-varying-levels-of-chelated-trace-mineral-complex
#10
Hossein Seyfori, Hossein Ali Ghasemi, Iman Hajkhodadadi, Mohammad Hassan Nazaran, Maryam Hafizi
The effects of water supplementation of chelated trace minerals (CTM, which is named Bonzaplex designed with chelate compounds technology) on growth performance, apparent total tract digestibility (ATTD) of minerals, and some blood metabolites, TM, and antioxidant enzyme values in African ostriches were investigated from 8 to 12 months of age. A total of 20 8-month-old ostriches (five birds in five replicate pens) was randomly allocated into one of the following four treatments: (1) control (basal diet + tap water), (2) low CTM (basal diet +100 mg/bird/day CTM powder in tap water), (3) medium CTM (basal diet +1 g/bird/day CTM powder in tap water), and (4) high CTM (basal diet +2 g/bird/day CTM powder in tap water)...
August 11, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28799803/nutrition-inflammation-and-liver-spleen-axis
#11
Luigi Barrea, Carolina Di Somma, Giovanna Muscogiuri, Giovanni Tarantino, Gian Carlo Tenore, Francesco Orio, Annamaria Colao, Silvia Savastano
Chronic low-grade systemic inflammation represents a mechanism common to many diseases linked to atherosclerosis-related pathways. There is a growing body of evidence indicating that the combination of food quantity and quality along with genetic susceptibility are able to induce the aberrant activation of innate immune signalling, which initially contributes to chronic low-grade inflammation. Liver represents the central player to inflammatory response. Dietary/metabolic factors contribute to the pathogenesis of Non-alcoholic Fatty Liver Disease (NAFLD), the main causes of liver disease in the Western world...
August 11, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28797062/why-organic-resources-and-current-fertilizer-formulations-in-southern-africa-cannot-sustain-maize-productivity-evidence-from-a-long-term-experiment-in-zimbabwe
#12
Tongai J Mtangadura, Florence Mtambanengwe, Hatirarami Nezomba, Jairos Rurinda, Paul Mapfumo
Sustainability of maize-based cropping systems is a major challenge for southern Africa, yet the demand for maize as staple food and animal feed in the region continues to increase. A study was conducted on a sandy clay loam (220 g clay kg-1 soil) at Domboshawa in Zimbabwe to investigate the long-term effects of organic resource quality and application rate, and nitrogen (N) fertilization on soil chemical properties and maize (Zea mays L.) productivity. Crotalaria juncea (high quality), Calliandra calothyrsus (medium quality), cattle manure (variable quality), maize stover and Pinus patula sawdust (both low quality) were incorporated into soil at 4...
2017: PloS One
https://www.readbyqxmd.com/read/28795378/a-novel-treatment-processes-of-struvite-with-pretreated-magnesite-as-a-source-of-low-cost-magnesium
#13
Rongtai Yu, Hongqiang Ren, Jichun Wu, Xuxiang Zhang
By crystallization process, phosphorus can be recycled from wastewater. However, the reagent cost limits the application of struvite precipitation. Magnesite, as a low-cost magnesium source, can result in a cost savings, while the poor dissolution offset of low-cost reagent. In this study, most of the pyrolysate of magnesite was dissolved by changing the process of reagent addition; the solubility of the pyrolysate was increased at acid wastewater. The removal rate of phosphate by the pyrolysate was higher than that of magnesite, the phosphate removal rate was from 70...
August 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28792210/electrolyte-based-on-easy-synthesized-and-low-price-triphenolate-borohydride-salt-for-performant-mg-tfsi-2-glyme-rechargeable-magnesium-batteries
#14
Seydou Hebié, Hoang Phuong Khanh Ngo, Jean-Claude Leprêtre, Cristina Iojoiu, Laure Cointeaux, Romain Berthelot, Fannie Alloin
A new class of electrolyte based on TFSI- and triphenolate borohydride anions was designed and produced which fulfills all requirements of easy synthesis, high ionic conductivity, wide potential window and non-corrosion of Al current collector. The electrolyte composed of magnesium triphenolate borohydride and Mg(TFSI)2 in glyme displays simultaneously high conductivity with 5.5 mS cm-1 at 25°C and a reversible Mg plating/stripping with high current density and coulombic efficiency at room temperature. By addition of a slight amount of MgCl2 to this electrolyte, a coulombic efficiency of 90% in SS/Mg cell, a stable cycling performance, and wide anodic potential of 3...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28782934/h2v3o8-nanowires-as-high-capacity-cathode-materials-for-magnesium-based-battery
#15
Han Tang, Nuo Xu, Cunyuan Pei, Fangyu Xiong, Shuangshuang Tan, Wen Luo, Qinyou An, Liqiang Mai
Magnesium-based batteries have received much attention as promising candidates to next-generation batteries because of high volumetric capacity, low price, and dendrite-free property of Mg metal. Herein, we reported H2V3O8 nanowire cathode with excellent electrochemical property in magnesium-based batteries. First, it shows a satisfactory magnesium storage ability with 304.2 mA h g(-1) capacity at 50 mA g(-1). Second, it possesses a high-voltage platform of ∼2.0 V vs Mg/Mg(2+). Furthermore, when evaluated as a cathode material for magnesium-based hybrid Mg(2+)/Li(+) battery, it exhibits a high specific capacity of 305...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28779986/gas-adsorption-on-commercial-magnesium-stearate-effects-of-degassing-conditions-on-nitrogen-bet-surface-area-and-isotherm-characteristics
#16
Darren P Lapham, Julie L Lapham
Commercial grades of magnesium stearate have been analysed by nitrogen adsorption having been pre-treated at temperatures between 30°C and 110°C and in the as-received state. Characteristics of nitrogen adsorption/desorption isotherms are assessed through the linearity of low relative pressure isotherm data and the BET transform plot together with the extent of isotherm hysteresis. Comparison is made between thermal gravimetric analysis and mass loss on drying. Features of gas adsorption isotherms considered atypical are identified and possible causes presented...
August 2, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28776973/reduced-graphene-oxide-coating-with-anticorrosion-and-electrochemical-property-enhancing-effects-applied-in-hydrogen-storage-system
#17
Yi Du, Na Li, Tong-Ling Zhang, Qing-Ping Feng, Qian Du, Xing-Hua Wu, Gui-Wen Huang
Low-capacity retention is the most prominent problem of the magnesium nickel alloy (Mg2Ni), which prevents it from being commercially applied. Here, we propose a practical method for enhancing the cycle stability of the Mg2Ni alloy. Reduced graphene oxide (rGO) possesses a graphene-based structure, which could provide high-quality barriers that block the hydroxyl in the aqueous electrolyte; it also possesses good hydrophilicity. rGO has been successfully coated on the amorphous-structured Mg2Ni alloy via electrostatic assembly to form the rGO-encapsulated Mg2Ni alloy composite (rGO/Mg2Ni)...
August 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28773944/wire-arc-additive-manufacturing-of-az31-magnesium-alloy-grain-refinement-by-adjusting-pulse-frequency
#18
Jing Guo, Yong Zhou, Changmeng Liu, Qianru Wu, Xianping Chen, Jiping Lu
Wire arc additive manufacturing (WAAM) offers a potential approach to fabricate large-scale magnesium alloy components with low cost and high efficiency, although this topic is yet to be reported in literature. In this study, WAAM is preliminarily applied to fabricate AZ31 magnesium. Fully dense AZ31 magnesium alloy components are successfully obtained. Meanwhile, to refine grains and obtain good mechanical properties, the effects of pulse frequency (1, 2, 5, 10, 100, and 500 Hz) on the macrostructure, microstructure and tensile properties are investigated...
October 9, 2016: Materials
https://www.readbyqxmd.com/read/28773933/%C3%A2%C2%B5xrf-elemental-mapping-of-bioresorbable-magnesium-based-implants-in-bone
#19
Anna Turyanskaya, Mirjam Rauwolf, Tilman A Grünewald, Martin Meischel, Stefanie Stanzl-Tschegg, Jörg F Löffler, Peter Wobrauschek, Annelie M Weinberg, Helga C Lichtenegger, Christina Streli
This study investigated the distribution of the elemental constituents of Mg-based implants at various stages of the degradation process in surrounding bone tissue, with a focus on magnesium (Mg), as the main component of the alloy, and yttrium (Y), due to its potential adverse health effects. The measurements were performed on the implant-bearing thin sections of rat bone in a time series of implant degradation between one and 18 months. Micro X-ray fluorescence analysis (μXRF) with a special spectrometer meeting the requirements for the measurements of low-Z elements was used...
September 30, 2016: Materials
https://www.readbyqxmd.com/read/28773049/a-fatigue-life-prediction-method-based-on-strain-intensity-factor
#20
Wei Zhang, Huili Liu, Qiang Wang, Jingjing He
In this paper, a strain-intensity-factor-based method is proposed to calculate the fatigue crack growth under the fully reversed loading condition. A theoretical analysis is conducted in detail to demonstrate that the strain intensity factor is likely to be a better driving parameter correlated with the fatigue crack growth rate than the stress intensity factor (SIF), especially for some metallic materials (such as 316 austenitic stainless steel) in the low cycle fatigue region with negative stress ratios R (typically R = -1)...
June 22, 2017: Materials
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