用中子活化分析法测定江西荼叶中的微量元素

用中子活化分析法测定江西荼叶中的微量元素马永焕，陶秉莹，丘相国，谢明勇（南昌大学食品学院，南昌３３００２９）ＴｈｅＤｅｔｅｒｍｉｎａｔｉｏｎｏｆＴｒａｃｅＥｌｅｍｅｎｔｓｉｎＪｉａｎｇｘｉＴｅａｂｙＮｅｕｔｒｏｎＡｃｔｉｖａｔｉｏｎＡｎａｌｙｓｉｓＭ...     

Analysis of differentially expressed genes in fetal skin of scarless and scar-forming periods of gestational rats

Objective: To study the differences of gene expression between earlier gestational skin and later gestational skin of rats with the aids of single primer amplification (SPA) and high-density oligonucleotide DNA array to understand the molecular mechanism of scarless healing. Methods: Total RNAs were isolated from fetal rat skin of the scarless (E15) and scar-forming (E18) periods of gestation (term =21.5 days). The RNAs from earlier gestational skin (EGS) and later gestational skin (LGS) were both reversely transcribed to cDNAs, then labeled with the incorporation of fluorescent dCTP for preparing the hybridization probes by SPA method. The mixed probes were then hybridized to the oligonucleotide DNA arrays which contained 5 705 probes representing 5 705 rat genes. After highly stringent washing, these DNA arrays were scanned for fluorescent signals to display the differentially expressed genes between the 2 groups of skin. Results: Among 5 705 rat genes, there were 53 genes (0.93%) with differentially expressed levels between EGS and LGS groups, 27 genes, including fibroblast growth factor 2 ( FGF2 ) and follistatin were up-regulated (0.47%) and 26 genes were down-regulated (0.46%) in fetal skin during scarless period versus scar-forming period. Higher expressions of FGF2 and follistatin in EGS than those in LGS were also revealed by RT-PCR method. Conclusions: High-density oligonucleotide DNA array provided a powerful tool for investigating differential gene expression in earlier and later gestational fetal skins. This technology validates that the mechanism of fetal scarless healing is very complicate and the change of many gene expressions is associated with fetal scarless healing.     

异基因骨髓移植后供者干细胞输注与供者淋巴细胞输注抗白血病作用的比较

异基因骨髓移植后白血病复发是一个重要的问题,其发生率达10%～36%.在疾病晚期和采用去T细胞移植的患者中复发率可高达70%以上[1],对于此类患者联合化疗效果差,而二次移植则只在晚期复发的患者中效果较好[2,3].一些研究者曾采用供者免疫活性细胞输注或使用人重组白细胞介素2来刺激供者造血或增强移植物抗白血病作用(graft-versus-leukemia,GVL)[4-6].我们报告了20例异基因骨髓移植后复发的白血病患者,对他们分别进行了无粒细胞集落刺激因子(G-CSF)动员的供者淋巴细胞(donor-derived lymphocyte,DDL)输注或G-CSF刺激后采集的供者干细胞(peripheral blood progenitor cell,PBPC)输注.     

16种抗生素在两种培养基上抑菌效果观察

细菌学纸片扩散法药物敏感试验的标准为Kirby-Bauer法，该法指定选用Mueller－Hinton琼脂（MHA）作为实验用培养基。为了解抗生素在普通营养琼脂（NA）和MHA培养基上抑菌效果的差异，我们选择了16种常用抗生素，对照观察了各种抗生素对某一菌株在这两种培养基上抑菌圈直径的差别。回材料和方法1．1材料氨于西林、校等西林、听拉西林、头抱哩琳、头抱拉定、头抱磷脂、头抱曲松、头抱响酮、头抱他定、庆大霉素、受市霉素、链霉素、阿米卡星、诺氟沙星、环丙沙星和氧氟沙星共16种。NA、MHA和药敏纸片，均采用杭州康壮生物工程公司产品。…     

亲电性对醌二甲烷与富电子烯烃的电荷转移聚合

概述了亲电性对醌二甲烷与富电子烯烃电荷转移聚合的最新进展，着重介绍聚合的一般特征、引发机理、链增长机理，以及单体结构、溶剂对聚合反应的影响。     

治痹一例

张××,女,55岁,农民。1984年5月8日诊。素患痹证。一月前因下田栽秧,次日即出现全身关节肌肉酸痛,逐渐加重,左膝红肿疼痛,不能屈伸,头晕,心悸,口渴,便结尿黄,形体消瘦。体温39.5℃,舌质黯,苔黄微腻,脉滑数。此乃体内素有蕴热,复感寒湿,蕴郁日久,化热化火,壅滞气血,变生关节不利诸证。治宜清热泻火,宣痹通络,兼祛风湿。处     

左旋精氨酸与维生素B6对低密度脂蛋白抑制兔胸主动脉内皮舒张功能的影响

目的观察正常人的低密度脂蛋白(native low density lipoprotein,nLDL),人工氧化的低密度脂蛋白(oxidized lowdensity lipoprotein,ox-LDL)及非胰岛素依赖型糖尿病(Non-insulin dependent diabetes mellitus,MDDM)患者的低密度脂蛋白(diabetic low density lipoprotein,dLDL)对兔胸主动脉环内皮的损伤作用及左旋精氨酸(L-arginine,L-Arg),维生素B6(pyridoxine,VB6)的拮抗效应.方法采用离体动脉环灌流的方法,观察兔胸主动脉环对乙酰胆碱(acetycholine,Ach),钙离子载体A23187的舒张反应.结果3种LDL均抑制动脉环对Ach及A23187的舒张,损伤强度为ox-LDL＞dLDL＞nLDL,并具有浓度依赖性;L-Arg、VB6能明显拮抗LDL的抑制作用,但并不能完全逆转.以SOD作为保护药对照,250 U/ml的浓度能够显著抑制dLDL对内皮的损伤.结论3种低密度脂蛋白主要可能通过降低NO生物活性损伤内皮,L-Arg、VB6具有内皮保护作用.     

25K型空调客车空气质量测定报告

为了解国产25K型空调客车在运营过程中车厢内空气质量，为今后新型空调客车的改进提供卫生学依据，我们选择了对空气质量评价较具有代表性的“一氧化碳、二氧化碳、细菌总数”3个指标，于2001年7月—2002年12月对25K型空调客车空气质量进行了测定，结果显示，25K型全列空调客车空气中的上述指标在同等条件下较高于256型全列空调客车，结论为25K型客车车厢的空气质量较256型差。     

X线摄影体位激光角度测量仪的研制及临床应用

X线的影像是平面的，肢体是立体的。避免某些部位在摄影中发生影像重叠，一般采用三维空间内被照体的固定倾斜及X线射入方向相结合的方法。肢体倾斜角度的测量，一般需三角板作为常用测量工具。其缺点是准确率低我们在实践工作中研制了摄影体位激光角度测量仪，简易实用。现介绍如下：