White matter network damage mediates association between cerebrovascular disease and cognition

To determine whether white matter network disruption mediates the association between MRI markers of cerebrovascular disease (CeVD) and cognitive impairment. Participants (n = 253, aged ≥60 years) from the Epidemiology of Dementia in Singapore study underwent neuropsychological assessments and MRI. CeVD markers were defined as lacunes, white matter hyperintensities (WMH), microbleeds, cortical microinfarcts, cortical infarcts and intracranial stenosis (ICS). White matter microstructure damage was measured as fractional anisotropy and mean diffusivity by tract based spatial statistics from diffusion tensor imaging. Cognitive function was summarized as domain-specific Z-scores.Lacunar counts, WMH volume and ICS were associated with worse performance in executive function, attention, language, verbal and visual memory. These three CeVD markers were also associated with white matter microstructural damage in the projection, commissural, association, and limbic fibers. Path analyses showed that lacunar counts, higher WMH volume and ICS were associated with executive and verbal memory impairment via white matter disruption in commissural fibers whereas impairment in the attention, visual memory and language were mediated through projection fibers.Our study shows that the abnormalities in white matter connectivity may underlie the relationship between CeVD and cognition. Further longitudinal studies are needed to understand the cause-effect relationship between CeVD, white matter damage and cognition.     

溃结Ⅰ号的制备与稳定性考察

目的提高医院临时处方溃结Ⅰ号保留灌肠剂的稳定性,并对其中的主要成分含量进行控制。方法制备时加入助悬剂,用沉降容积比和再分散性选择适宜的助悬剂及其最佳助悬浓度,并用紫外分光光度法对主要成分柳氮磺吡啶的含量进行测定。结果在制剂中加入卡波母作为助悬剂0.15%就可以达到良好的助悬效果,而且制备的制剂再分散性好。结论加入卡波母作为助悬剂制备的制剂稳定,再分散性好,便于使用和保存。     

石南藤、山蒟活性成分的分离和结构鉴定

已报道自山蒟及石南藤中分得海风藤酮(Ⅰ),denudatin B(Ⅱ),N-isobutyl-deca-trans-2-trans-4-dienamide(Ⅲ),本文继续报道自山蒟中分得一新木脂素,命名为山蒟素D(Ⅳ),X-衍射晶体结构测定为外消旋光学异构体。自石南藤分得Ⅳ的同系物,为新结构、命名为南藤素(Ⅴ),以及山蒟素C(Ⅵ),galgravin(Ⅶ),二氢毕拨明宁碱(Ⅷ)及巴豆环氧素(Ⅸ)。以上化合物皆首次自山蒟及石南藤中分得。以血小板活化因子(PAF)引起的血小板凝集实验测定活性,除Ⅲ,Ⅳ,Ⅶ,Ⅸ外皆有抑制活性。     

争光霉素A6和它在争光霉素复合物的地位

争光霉素A₅已鉴别为Bleomycin A₆,在争光霉素复合物中所占比例一般在10%左右,在某些批样中可高达15%以上。文献报告Bleomycin A₆在天然产的Bleomyein复合物中只有痕量。通过向发酵培养基中加入特定组分的末端胺可大大提高其特定组分在复合物中的含量比而其它组分的产生则不同程度地被抑制。但Bleomyein A₆例外,即使向培养基中加入其末端胺精胺(0.3mg/ml),在所产生的复合物中大大增多的组分是Bleomyein A₆,而Bleomycin A₆仍只有痕量。这表明争光霉素产生菌有和Bleomycin产生菌明显不同的特点。     

高效液相色谱法测定血浆中醋氯芬酸及其在犬体内药代动力学

建立了HPLC法同时测定家犬血浆中的醋氯芬酸及其主要代谢物的浓度。此法简便易行,精密度好,方法回收率91.3%～96.9%,日内、日间RSD为3.69%～8.13%,血药浓度在0.050～51.2μg·mL^-1范围内呈线性关系,相关系数0.9998,当S/N≥3时,最小检测浓度为10ng·mL^-1。此法可同时测定醋氯芬酸及其在体内的主要代谢物。醋氯芬酸po吸收迅速,给药后约12min即达血药浓度峰值,其药—时曲线符合二室模型,T_1/2α仅为2.5min左右,T_1/2β约为137min,代谢物约在110min达到血药浓度峰值,峰浓度为3.20μg·mL^-1,T_1/2β约为140min。     

大丁草中抗菌活性成分的研究Ⅳ

从秋季采收的菊科植物大丁草Gerbera anandria(L.)Sch Bip.全草中共分出十三种成分。本文报道其中三个新化合物的结构鉴定.它们分别是3,8-dihydroxy-4-methoxy-coumarin(ⅪⅩ),3,8-dihydroxy-4-methoxy-2-oxo-2 H-1-benzopyran-5-carboxylic acid(ⅩⅦ),和5,8-dihydroxy-7-(4-hydroxy-5-methyl-coumarin-3-)-coumarin(ⅩⅪ)。     

北野菊黄酮类成分研究

从北野菊(Dendranthema lavandulifolium)全草中分得四个黄酮类化合物。经光谱(UV,IR,氢谱,碳谱,质谱等)方法鉴定其结构,分别为木樨草素(I),洋芹素(I),金合欢素-7-O-α-L-鼠李糖基(1→6)-β-D-葡萄糖甙(II)和金合欢素-7-O-α-L-鼠李糖基(1→6)-[2-O-乙酰基-β-D-葡萄糖基(1→2)]-β-D-葡萄糖甙(IV)。其中,I和I为首次从该植物中得到,IV为一个新化合物。     

胃复安引起过敏性荨麻疹1例

1　病例报告　男 ,2 4岁 ,因晨起饮冷开水后 ,阵发性上腹痛伴恶心 1h,呕吐 1次来就诊 ,其间无腹泻 .既往无眩晕及肝肾疾病史 .查体 :T36 .8℃ ,HR79次· min- 1 ,BP14.1/10 .2 k Pa,一般状况可 ,咽、扁桃体不充血 ,心肺未见异常 ,腹部平坦 ,未见明显肠型及蠕波 ,左上腹深压痛 ,无肌卫及反跳收稿日期 :2 0 0 0 -0 7-2 1;　修回日期 :2 0 0 0 -0 8-2 3作者简介 :丁向清 (196 8-) ,男 (汉族 ) ,湖北省应城市人 .主治医师 .Tel.(0 431) 79710 16 Ext. 6 6 5 12痛 ,肝脾未及 ,肠鸣音略亢进无气过水声 ,肾区无叩痛 ,胸腹透未见异常 ,WBC 5 .3…     

Height, health and growth hormone

The principal objective of this paper is to provide health practitioners with information on the positive aspects of shorter stature for use in counseling short children with poor self-images. Another objective is to provide information on the physical capabilities, health potential and psychosocial characteristics of shorter stature as a baseline for deciding whether a healthy short child should receive growth hormone therapy. The information presented here was obtained from review of publications covering medical and nutritional research, gerontological studies, athletic performance and environmental, biological and engineering aspects of the human body. It was found that the popular belief in the superiority of tall stature is based primarily on social bias rather than on a scientific foundation. Studies indicating that taller people are healthier or more productive than shorter ones have ignored a wide range of evidence that shorter people are highly creative, productive, long-lived, athletic and better for the environment. The authors urge medical and scientific professionals to consider the many advantages of shorter stature in terms of health, social and environmental benefits.