Interaction of Œnococcus œni and oak wood compounds

The purpose of this work was to study the effect of wood extract on Œnococcus œni growth in synthetic media and its influence on the concentration of volatile compounds when lactic acid bacteria (LAB) are present. Analytical results and sensorial consequences are described when malolactic fermentation was performed in tank or barrels. Using gas chromatography-mass spectrometry, the modifications in oaklactone, eugenol, isoeugenol and vanillin levels were monitored in the presence of Œ. œni. These volatile compounds are known to have powerful characteristic odors (woody, spicy, smoky and vanillin) and to play a role in wine aroma. LAB cultures were performed in synthetic media supplemented with oak wood shavings or extracts. The bacterial growth rate was lower in the absence of heated shavings.This study shows that LAB, especially Œ. œni, are able to interact with wood and form volatile compounds. In laboratory medium, the heating of wood favored bacterial viability more than the simple addition of wood shavings. This is the first demonstration of the capacity of wine Œ. œni to enhance volatile compounds from wood.     

X射线诱导人外周血淋巴细胞GADD45和p21基因表达上调

应用实时荧光逆转录聚合酶链反应(RT-PCR)方法,定量分析不同剂量X射线体外照射对人外周血淋巴细胞GADD45和p21基因表达的影响,探讨了运用mRNA水平变化作为电离辐射生物剂量计的可能性。结果表明:经1、2、3、5Gy X射线照射后24h,GADD45和p21基因表达均明显上调。GADD45基因表达在1-5Gy照射剂量范围内呈指数相关。p21基因表达在1-3Gy照射剂量范围内呈线性剂量效应关系,但5.0Gy照射后,其表达不再继续增加。结果表明,X射线照射后人外周血淋巴细胞GADD45和p21基因的表达在一定剂量范围内呈剂量依赖性上调,GADD45更适合发展为核事故受照射人员的分子生物剂量计。     

Measurement of 153Sm-EDTMP bone uptake by whole-body scintigraphy and its application to individualized treatment dosimetry of bone metastasis

1 INTRODUCTIONSamarium-153 ethylenedialninetetramethylene phosphonic acid ("'Sin-EDTMP) iselective in the palation of painful bony metastases[1]. Pain relief is seen in 60%~90%of patients treated with "'Sin-EDTMP, and the onset Of pain relief generally beginswithin 1 week of administration. The critical organ in 153Sin-EDTMP therapy is thered bone marrow and myelotoalcity can be a significant side effect of the administrationof therapeutic activities of 153Sin-EDTMP[2]. There is…     

Carving the Active Site of CYP153A7 Monooxygenase for Improving Terminal Hydroxylation of Medium-Chain Fatty Acids

The P450-mediated terminal hydroxylation of non-activated C−H bonds is a chemically challenging reaction. CYP153A7 monooxygenase, discovered in Sphingomonas sp. HXN200, belongs to the CYP153A subfamily and shows a pronounced terminal selectivity. Herein, we report the significantly improved terminal hydroxylation activity of CYP153A7 by redesign of the substrate binding pocket based on molecular docking of CYP153A7−C_8:0 and sequence alignments. Some of the resultant single mutants were advantageous over the wild-type enzyme with higher reaction rates, achieving a complete conversion of n-octanoic acid (C_8:0, 1 mM) in a shorter time period. Especially, a single-mutation variant, D258E, showed 3.8-fold higher catalytic efficiency than the wild type toward the terminal hydroxylation of medium-chain fatty acid C_8:0 to the high value-added product 8-hydroxyoctanoic acid.     

唾液及血清c-erbB-2蛋白、CA153检测在乳腺癌诊断中的应用

目的探讨唾液及血清中c-erbB-2蛋白（P185）、CA153检测对乳腺癌的诊断价值。方法采集乳腺癌患者（n=35,乳腺癌组）、乳腺良性疾病患者（n=32,良性组）及健康女性（n=35,对照组）的静脉血及唾液。运用ELISA方法检测唾液及血清中P185水平,电化学发光免疫分析法检测唾液及血清中CA153水平,并计算各项指标的灵敏性、特异性、诊断准确性等。结果乳腺癌组唾液及血清P185、CA153水平均明显高于良性组及对照组,差异有统计学意义（P〈0.05）;良性组与对照组比较,差异无统计学意义（P〉0.05）。唾液标本2项肿瘤标志物检测诊断乳腺癌的敏感性均略低于血清标本,特异性均高于血清标本。唾液及血清标本2项联合检测与单项标志物比较,诊断的敏感性有明显的提高,而且保持了较高的特异性和诊断准确性。结论唾液及血清联合检测c-erbB-2蛋白、CA153均能提高乳腺癌的诊断率,检测唾液中的肿瘤标志物有望在乳腺癌的诊治中得到临床应用。     

153Sm,113,117Snm烷基膦酸配合物的表观脂水分配系数及与BSA的结合率

测定了NTMP(次氮三亚甲基膦酸),HEDTMP(N-(羟乙基)乙二胺基三亚甲基膦酸),DCTMP(1,2-环己二胺四亚甲基膦酸),EDTMP(乙基二胺基四亚甲基膦酸),DTPMP(二乙基三胺基五亚甲基膦酸)的^153Sm配合物以及HEDTMP,EDTMP,DTPMP的^113,117Sn^m配合物在正辛醇-水中的表观脂水分配系数和在0．5％牛血清白蛋白(BSA)水溶液中与BSA的结合率。结果表明,这些配合物在正辛醇一水中的相对表观脂水分配系数和在BSA水溶液中与BSA的相对结合率呈线性正相关。两者之间的线性关系为这类配合物脂水分配系数的预测提供了一种新方法,同时也表明,在金属配合物与BSA的结合过程中,疏水作用力起着重要作用。     

89Sr、153Sm内照射治疗骨转移癌引起骨痛的剂量研究

对^89Sr或^153Sm-EDTMP治疗的72例(74例次)骨转移癌病人的疗效、内照射靶器官的吸收剂量以及剂量响应关系进行了分析评价。结果表明,经^89Sr治疗的3l例(33例次)骨转移癌病人,治疗后骨痛反应属Ⅰ级者15例次,Ⅱ级者14例次,共29例次,占87．88％;Ⅲ级者4例次,占12．12％。未发现治疗后骨痛反应分级与^89Sr用量有明显关系;经^153Sm-EDTMP治疗的41例骨转移癌病人,治疗后骨痛反应属Ⅰ级者19例,Ⅱ级者18例,共37例,占90．24％;Ⅲ级者4例,占9．76％。未发现治疗后骨痛反应分级与^153Sm-EDTMP用量有明显关系。结果提示,亲骨性放射性药物^89Sr、^153Sm-EDTMP姑息治疗骨转移癌的骨痛效果显著。     

Average Neutron Capture Cross Sections of 151Eu and 153Eu from 3 to 100 keV

Neutron capture cross sections of europium isotopes ¹⁵¹Eu and ¹⁵³Eu were measured in the neutron energy range of 3~100keV. Experiments were carried out with the time-of-flight facility at the 52 m station of the JAERI Electron Linear Accelerator. Prompt capture γ-rays were detected by a large liquid scintillation detector and the neutron flux shape was determined with a ⁶Li glass scintillation detector. The average capture cross sections were examined in terms of energy independent strength functions for ¹⁵¹Eu and ¹⁵³Eu.