心室晚电位的时间－频率表示法的进一步改进

在心室晚电位的研究中，我们引入了信号的时间一频率表示法，并根据晚电位的具体特性用Ｗｉｇｎｅｒ分布法（维格纳分布）把信号表示为在时间及频率空间中的能量分布。由于Ｗｉｇｎｅｒ分布的优异性质使我们有可能更准确表示出心室晚电位的存在。但当输入信号是两个信号的线性叠加时，Ｗｉｇｎｅｒ分布的结果会出现一个交叉项，相当于引入干扰。针对此不足，作者介绍改进方案，消除部分交叉项，收到较好的效果，并给出一些仿真及应用实例。     

葛根素对LPS诱导急性脑损伤小鼠的保护作用

目的:研究葛根素(Pur)对脂多糖(LPS)诱导的小鼠急性感染性脑损伤的保护作用及机制。方法:36只清洁级雄性ICR小鼠随机分为正常对照组(NS)、LPS感染组(LPS)和葛根素组(Pur+LPS)。LPS腹腔注射建立急性脑损伤模型,立即腹腔注射给予葛根素注射液治疗,6和24h后旷场。暗场实验检测各组小鼠的自发活动,WesternBlot检测脑组织白细胞分化抗原14(CD14)和环氧化酶2(C0X-2)蛋白表达量,Nisl染色观察神经元存活情况。结果:与NS组相比,LPS组6和24 h旷场实验自主活动距离和穿格次数显著减少,海马神经元的存活数目显著减少,脑组织CD14和C0X-2蛋白表达量显著升高(P<0.05);与LPS组比较,Pur+LPS组6和24 h时海马神经元的存活率明显提高,且CD14和C0X-2蛋白表达量明显下降(P<0.05)。结论:葛根素注射液对LPS所致小鼠急性感染性脑损伤具有一定保护作用,其作用机制可能与抑制脑组织CD14和C0X-2表达有关。     

No association between schizophrenia and homozygosity at the D3 dopamine receptor gene

The D₃ dopamine receptor gene is an important candidate gene for schizophrenia, since (because of its almost exclusive expression in the limbic system) it combines the dopamine receptor hypothesis with the limbic system hypothesis of schizophrenia. A BalI restriction fragment length polymorphism of the D₃ dopamine receptor gene has been typed in 107 schizophrenic patients and 98 normal controls from Sichuan (China). With regard to alleles or genotypes, no significant differences were obtained between controls from Europe and China, between patients and controls, and between patient subgroups and controls. These results indicate a lack of association between schizophrenia and the D₃ dopamine receptor gene in our sample. Our findings are at variance with reports of a significant excess of homozygosity at the D₃ dopamine receptor gene in schizophrenic patients from Wales (United Kingdom) and Alsace (France). In conclusion, further studies will be needed with larger samples of patients from Wales and Alsace as well as with samples of different racial groups to prove or disprove the initial positive association between schizophrenia and genotypes of the D₃ dopamine receptor gene. © 1993 Wiley-Liss, Inc.     

关于中医推拿手法摆动类法施力的频域分析

依据中医推拿手法测力分析仪ＦＺ－Ⅰ型上所测得的施力数据，对各向作用力进行频域分析，并对各频段成分在综合推拿效用中所起的作用以及与其它因素的相互关系作了比较与分析。     

SRBC膜提取物及其对猪PBMNC激活作用的研究

胰酶水解绵羊红细胞（ＳＲＢＣ）膜得到粗提物，经离子交换层析部分纯化后，获得组分ＴＲＦ－Ⅲ（Ｔｒｙｐｓｉｎ－ｒｅｌｅａｓｅｄｆｒａｃｔｉｏｎⅢ）具有明显抑制ＳＲＢＣ与猪外周血淋巴细胞形成Ｅ玫瑰花的活性，花环形成率与ＴＲＦ－Ⅲ含量有明显的函数关系，电泳测定其分子量为６６ｋＤ。ＴＲＦ－Ⅲ单独作用尽管对ＰＢＭＮＣ的增殖无作用，但可增强ＰＨＡ刺激ＰＢＭＮＣ的增殖作用，ＴＲＦ－Ⅲ单独作用于ＰＢＭＮＣ可显著增强     

Pleiotropic genomic variants at 17q21.31 associated with bone mineral density and body fat mass: a bivariate genome-wide association analysis

Osteoporosis and obesity are two severe complex diseases threatening public health worldwide. Both diseases are under strong genetic determinants as well as genetically correlated. Aiming to identify pleiotropic genes underlying obesity and osteoporosis, we performed a bivariate genome-wide association (GWA) meta-analysis of hip bone mineral density (BMD) and total body fat mass (TBFM) in 12,981 participants from seven samples, and followed by in silico replication in the UK biobank (UKB) cohort sample (N = 217,822). Combining the results from discovery meta-analysis and replication sample, we identified one novel locus, 17q21.31 (lead SNP rs12150327, {"type":"entrez-nucleotide","attrs":{"text":"NC_000017.11","term_id":"568815581"}}NC_000017.11:g.44956910G > A, discovery bivariate P = 4.83 × 10⁻⁹, replication P = 5.75 × 10⁻⁵) at the genome-wide significance level (ɑ = 5.0 × 10⁻⁸), which may have pleiotropic effects to both hip BMD and TBFM. Functional annotations highlighted several candidate genes, including KIF18B, C1QL1, and PRPF19 that may exert pleiotropic effects to the development of both body mass and bone mass. Our findings can improve our understanding of the etiology of osteoporosis and obesity, as well as shed light on potential new therapies.Subject terms: Genome-wide association studies, Gene expression profiling     

葡甘聚糖-胶原蛋白-壳聚糖共混膜(I)

用溶液共混法制备了葡甘聚糖-胶原蛋白-壳聚糖(KCCS)共混膜。并用FT-IR,X-RD,SEM及透光率表征了膜的结构,同时测试了膜的抗张强度、断裂伸长率、吸水率、透水汽性、渗透性和吸附性。结果表明:共混膜中葡甘聚糖、胶原蛋白及壳聚糖之间存在着强烈的相互作用和良好的相容性,三者共混明显改善了纯聚合物和二元膜的性能。以共混膜为载体培养内皮细胞,发现共混膜具有良好的细胞相容性,预示着共混膜可作为潜在的组织工程支架材料。     

Polymorphism of human leukocyte antigen-DRB1, -DQB1, and -DPB1 genes of Shandong Han population in China

In the present study, polymerase chain reaction-sequence-based typing (PCR-SBT) was used to analyze human leukocyte antigen (HLA)-DRB1, -DQB1, and -DPB1 alleles of 98 unrelated healthy Shandong Han individuals. A total of 60 alleles, in which 28 in DRB1, 15 in DQB1 and 17 in DPB1 were found. Among the 28 detected DRB1 alleles, DRB1*150101, DRB1*070101, DRB1*090102, DRB1*120201, and DRB1*080302 were commonly observed, with frequencies of 16.3%, 11.2%, 10.2%, 8.2%, and 5.6%, respectively. The most predominant DQB1 allele was DQB1*030101/0309 with the frequency of 20.4%, followed by DQB1*0201/0202 (14.8%), DQB1*0602 (14.3%), DQB1*030302 (12.2%), and DQB1*060101/060103 (10.7%). Of the 17 detected DPB1 alleles, DPB1*0501 was the most frequent allele with the frequency of 37.2%. DPB1*020102 (18.4%), DPB1*040101 (11.2%), DPB1*0402 (7.1%), and DPB1*1701 (6.6%) were also very frequent alleles. A total of 53 estimated DRB1-DQB1 two-locus haplotypes were observed in Shandong Han population, of which DRB1*150101-DQB1*0602 was the most predominant, followed by DRB1*090102-DQB1*030302, DRB1*070101-DQB1*0201/0202 DRB1*120201-DQB1*030101/0309, and DRB1*080302- DQB1*060101/060103. The distribution of the HLA class II alleles and haplotypes frequencies as well as the dendrogram showed that the Shandong Han population belongs to the northern group of Chinese. The data have implications for anthropological studies and disease associations.