Influence of vitamin D mushroom powder supplementation on exercise-induced muscle damage in vitamin D insufficient high school athletes

Abstract

Incidence of vitamin D deficiency is increasing worldwide. The purpose of this study was to determine if supplementation with vitamin D₂ from Portobello mushroom powder would enhance skeletal muscle function and attenuate exercise-induced muscle damage in low vitamin D status high school athletes. Participants were randomised to Portobello mushroom powder (600 IU/d vitamin D₂) or placebo for 6 weeks. Participants then completed a 1.5-h exercise session designed to induce skeletal muscle damage. Blood samples and measures of skeletal muscle function were taken pre-supplementation, post-supplementation/pre-exercise and post-exercise. Six weeks supplementation with vitamin D₂ increased serum 25(OH)D₂ by 9.9-fold and decreased serum 25(OH)D₃ by 28%. Changes in skeletal muscle function and circulating markers of skeletal muscle damage did not differ between groups. In conclusion, 600 IU/d vitamin D₂ increased 25(OH)D₂ with a concomitant decrease in 25(OD)D₃, with no effect on muscular function or exercise-induced muscle damage in high school athletes.     

Science Letters:Volatile constituents in the flowers of Elsholtzia argyi and their varia-tion:a possible utilization of plant resources after phytoremediation

Phytoremediation effectiveness and remediation costs are driving factors of this project. Full utilization of plant resources after their being used for phytoremediation is an unsolved problem. GC/MS technique was used to investigate the volatiles of the flowers from Elsholtzia argyi (PFE1: Purple Flower Elsholtzia) and their variation     

Relative bioavailability and pharmacokinetic comparison of two different enteric formulations of omeprazole

In order to comply with the requirements for a drug listed in China, the study was developed to compare the pharmacokinetics and relative bioavailability of two different enteric formulations of omeprazole (OPZ) in healthy Chinese subjects. A total of 32 volunteers participated in the study. Plasma concentrations were analyzed by nonstereospecific liquid chromatography/tandem mass spectrometric (LC-MS/MS) method. After administration of a single 40-mg dose of the two OPZ formulations, the comparative bioavailability was assessed by calculating individual AUC_0−t (the area under the concentration-time curve from time zero to the last measurable concentration), AUC_0−∞ (the area under the concentration-time curve extrapolated to infinity), C _max (the maximum observed concentration), and T _peak (the time to C _max) values of OPZ, 5-hydroxyomeprazole (OH-OPZ), and omeprazole sulfone (OPZ-SFN), respectively. The 90% confidence intervals (CIs) of AUC_0−t , AUC_0−∞, and C _max were 85.4%–99.0%/88.8%–98.6%/87.6%–99.4%, 85.5%–99.2%/89.0%–98.6%/88.5%–101.3%, and 72.3%–87.6%/79.6%–91.1%/88.4%–99.1% for OPZ/OH-OPZ/OPZ-SFN, respectively, and T _peak values did not differ significantly. In this study, the test formulation of OPZ in fasting healthy Chinese male volunteers met the Chinese bioequivalance standard to the reference formulation based on AUC, C _max, and T _peak.     

The materials and techniques used in the paintings of Francis Bacon (1909–1992)

Abstract

Materials from 38 paintings by Francis Bacon (1909–1992), including 21 complete works and 17 partially destroyed canvases are investigated. Observations are made of the artist's technique and details are compiled of the supports used. Samples of paint and priming were taken for analysis using polarized light microscopy, Fourier transform infrared spectroscopy (FTIR), gas chromatography–mass spectrometry (GC–MS), pyrolysis–GC–MS (Py–GC–MS), and scanning electron microscopy coupled with energy dispersive X-ray analysis (SEM–EDX). Analysis of priming layers appears to show that the priming composition correlates well with particular ranges of dates. A fairly limited range of materials are found, with many of the same pigments found in works spanning Bacon's career, though other pigments were introduced at different stages in his career. Oil paints were used consistently for the painting of figures, but household paints were increasingly used in backgrounds from the 1960s onwards. A variety of different synthetic media are found in later works, including household acrylic paints and spray paints. Increased knowledge of Bacon’s materials is expected to be of great value to conservators caring for the work of this highly significant artist, and is already helping in the authentication of works attributed to him.     

国家创新系统中的图书馆

应用国家创新系统理论,分析图书馆在国家创新系统中的战略机会和战略发展问题。     

新西兰腊梅挥发性成分分析

采用水蒸气蒸馏法对云南从新西兰引种栽培的花卉植物腊梅（Chamelacium uncinatum）新鲜枝叶挥发油进行提取，应用GC／MS技术对腊梅挥发油成分和组成进行了分离鉴定，分离得到71个色谱峰,通过NIST98-L and wiley 7n．1标准谱库检索和文献比较鉴定其中67个化学成分，其质量占挥发油总质量的97．29％，主要成分为α-蒎烯（31．77％），α-松油醇（5．89％），醋酸香叶酯（4．58％），顺-罗勒烯（4．76％）和（-）-异长叶薄荷醇     

食用香椿香味成分分析

应用GC／MS技术对云南产食用香椿（Toona sinensis）挥发性成分和组成进行分析鉴定，从其中分离到57个色谱峰；通过NIST98．Land Wiley7n．1标准谱库检索和文献比较鉴定了其中50个化学成分，这些化学成分的质量占挥发油总质量的92．58％．     

微量元素及天然有机质对甜叶菊试管苗增殖和生长的影响

以甜叶菊试管苗为外植体,研究了MS培养基中微量元素对甜叶菊试管苗增殖、生根、生长及移栽等影响;同时也探讨了培养基中添加马铃薯汁、椰子汁、香蕉泥和水解乳蛋白等对试管苗增殖、生根、生长及移栽的影响。结果表明,微量元素对试管苗生长、增殖、生根产生重要作用,其中硼、锌、铜、铁的影响较为明显,尤其是锌元素是培养基中不可或缺的元素,它不仅影响试管苗的生长,而且对试管苗的移栽也产生较大影响,增加MS培养基中的锌元素的浓度,可促进试管苗的增殖、改善试管苗的质量;培养基中添加马铃薯汁、椰子汁、香蕉泥对试管苗的增殖具有一定的促进作用,其中香蕉泥能明显改进试管苗的质量,试管苗茎杆粗壮、生长旺盛,但添加水解乳蛋白却抑制试管苗的增殖和生长;在试管苗生根阶段,添加有机质作用不明显。     

二苯胺在抗爆剂TKC组分1,2-二氯乙烷中电子转移性质的研究

采用气相色谱／质谱联用技术(GC／MS)分析抗爆剂TKC辅助剂的成分．以抗爆剂的常用调合组分1，2-二氯乙烷做溶剂利用循环伏安法研究二苯胺的电子转移性质．结果表明：二苯胺类正离子自由基发生“尾-尾”偶合为联苯胺类化合物．     

甜菜中4种除草剂残留的超高效液相色谱—串联质谱检测方法研究

建立了超高效液相色谱—串联质谱(UPLC-MS/MS)同时测定甜菜中4种不同类型长效除草剂(氯嘧磺隆、嗪草酮、莠去津、咪唑乙烟酸)残留量的分析方法。样品经过甲醇提取,C18前处理小柱净化处理,以BEH C18(50mm×2.1mm i.d.,1.7μm)为色谱柱,0.1%(v/v)甲酸水溶液-0.1%(v/v)甲酸乙腈溶液为流动相梯度洗脱,电喷雾电离,在多反应监测(MRM)模式下测定。该方法标准曲线的线性良好,R值均大于0.99。在添加水平在0.01mg/kg和0.1mg/kg条件下,4种除草剂回收率为72.1%～98.1%,相对标准偏差均小于10%,说明检测方法可靠。