生命曾处处留下痕迹——浅析马尔克斯短篇小说《有人弄乱了玫瑰花》

[经典文本] 有人弄乱了玫瑰花 [哥伦比亚]加西亚·马尔克斯 今天是星期天,雨停了,我想选几朵红色的和白色的玫瑰花带到我的墓地去,这些玫瑰花是她为祭坛做花环而种的.今年冬天沉闷得令人害怕,雨后的早晨充满了凄凉的情景,我不禁想起镇上埋死尸的那座山头.那是片光秃秃的坡地,看不见树木,一阵风过后,偶尔会飘来几朵树绒.雨停后,...     

Protective effect of oat bran extracts on human dermal fibroblast injury induced by hydrogen peroxide

Oat contains different components that possess antioxidant properties;no study to date has addressed the antioxidant effect of the extract of oat bran on the cellular level.Therefore,the present study focuses on the investigation of the protective effect of oat bran extract by enzymatic hydrolysates on human dermal fibroblast injury induced by hydrogen peroxide(H2O2).Kjeldahl determination,phenol-sulfuric acid method,and high-performance liquid chromatography(HPLC) analysis indicated that the enzymatic products of oat bran contain a protein amount of 71.93%,of which 97.43% are peptides with a molecular range from 438.56 to 1 301.01 Da.Assays for 1,1-diphenyl-2-picrylhydrazyl(DPPH) radical scavenging activity indicate that oat peptide-rich extract has a direct and concentration-dependent antioxidant activity.3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide(MTT) colorimetric assay and the TdT-mediated digoxigenin-dUTP nick-end labeling(TUNEL) assay for apoptosis showed that administration of H2O2 in human dermal fibroblasts caused cell damage and apoptosis.Pre-incubation of human dermal fibroblasts with the Oatp for 24 h markedly inhibited human dermal fibroblast injury induced by H2O2,but application oat peptides with H2O2 at same time did not.Pre-treatment of human dermal fibroblasts with Oatp significantly reversed the H2O2-induced decrease of superoxide dismutase(SOD) and the inhibition of malondialdehyde(MDA).The results demonstrate that oat peptides possess antioxidant activity and are effective against H2O2-induced human dermal fibroblast injury by the enhanced activity of SOD and decrease in MDA level.Our results suggest that oat bran will have the potential to be further explored as an antioxidant functional food in the prevention of aging-related skin injury.     

Identification of acetic-acid tolerance of Saccharomyces cerevisiae strains by microsatellite markers

The aim of this paper is to use the microsatellites to evaluate acid-tolerance in Saccharomyces(S.) cerevisiae. Microsatellites have been widely used as the molecular marker to classify and identify S. cerevisiae strains, analyze genetic relationships among strains, and reveal genetic diversity of S. cerevisiae populations. In this paper, 25 key microsatellites of S. cerevisiae from 44 industrial yeast strains are investigated in the medium withconcentration gradients of acetic acid. Based on the analysis of correlations between the key microsatellite loci repeat numbers and acid-tolerance of the strains, the allele size of 4P14 a and 10P13 is positively related to acid-tolerance(p ? 0.05), the allele size of AT-X, 4P1 a and 10P8 are significantly negatively related to acid-tolerance(p ? 0.01). The above results provide informations on the molecular biodiversity of S. cerevisiae strains and can be a theoretical guidance for molecular marker assisted selection.     

意拳的脚法训练

意拳的脚法训练要先压腿，分正蹬和侧踹两个角度。但光是压腿还不够，还要前后甩腿，把肌腱拉开。     

Synthesis, crystal structure and photoluminescence of N,N’-di-5H-pyrido-[3',2':4,5]cyclopenta[1,2-b]pyridin-5-ylidenebiphenyl-4,4'-diamine

The compound N,N'-di-5H-pyrido-[3',2':4,5]cyclopenta[1,2-b]pyridin-5-ylidenebiphenyl-4,4'-diamine,formulated as C34H20N6,was synthesized and structurally characterized by single crystal X-ray diffraction.It is a non-planar molecule and strong π-π stacking interactions are observed in the structure.The compound exhibits photoluminescence property.     

尊严

提起维克多·格林尼亚教授。人们自然就会联想到以他的名字命名的格氏试剂。无论哪一本有机化学课本和化学史都有关于格林尼亚的名字和格氏试剂的论述。但是，你可知道这位伟大的发明者曾走过一段曲折的道路吗？[第一段]