热刺激在植物体内的传递效应

以高粱(Sorghum bicolor)和大豆(U.S.Soybean)幼苗为材料研究了仅植物很部受到热刺激时,其未直接受到温度影响的叶组织细胞的反应。当13天龄的高粱幼苗根部经受45℃4小时热处理时,发现其未直接受到热刺激的叶细胞内合成了一些异常的蛋白质,估测的分子量分别为80kD、70kD、33kD和17kD。最明显的两条蛋白质谱带是70kD和17kD。6天龄的大豆幼苗,当其根部经受40℃3小时热处理时,在其叶细胞内也检测到两条较为明显的蛋白质谱带,其分子量分别为60kD和17kD。观测到的这些异常蛋白质命名为‘热应激效应蛋白’,并与热应激蛋白在分子量大小分布上进行了比较。另外,还报道了利用蛋白质合成抑制剂,亚胺环己酮(cyclohexlmide)探讨了热应激蛋白与植物热耐性方面的可能关联。     

Complete reversion of the abo phenotype in D. melanogaster occurs only when the blood transposon is lost from region 32E.

Summary The abnormal oocyte phenotype is characterized by instability, as shown by the loss and reappearance of the abo maternal effect under specific genetic conditions. Our previous finding that a correlation exists between the abo phenotype and the presence of a blood transposon in region 32E, led us to perform an extensive genetic and molecular analysis of the most significant aspects of the abo phenotype in different genetic backgrounds. The results of these experiments can be summarized as follows: Complete reversion occurs only when the blood transposon is lost, thus definitively demonstrating that the insertion of the blood transposon in region 32E is the molecular event that causes the pleiotropic abo phenotype. Partial reversion can also occur without loss of the transposon, indicating that different molecular pathways may be involved in the loss of the abo phenotype. Reappearance of the full abo phenotype can occur only in heterozygous lines constructed from partially revertant abo homozygous lines that have not lost the blood transposon.     

Hemoglobin Dallas (α97(G4)Asn→Lys):functional characterization of a high oxygen affinity natural mutant

Hemoglobin Dallas, an α-chain variant with a substitution of lysine for asparagine at position 97(G4), was found to have increased oxygen affinity ($\text{p}{}_{\mathrm{<mtext>1</mtext><mtext>2</mtext>}}\text{= 1}\text{mmHg at pH}\text{7.3}\text{and}\text{20°C), diminished cooperativity (0n,}\text{the Hill coefficient}\text{= 1.7}$) and reduced Bohr effect (about 50%). Addition of allosteric effectors (such as 2,3-diphosphoglycerate, inositol hexakisphosphate and bezafibrate) led to a decrease in oxygen affinity and increase in cooperative energy. Kinetic studies at pH 7.0 and 20°C revealed that (i), the overall rate of oxygen dissociation is 1.4-fold slower than that for HbA and (ii), the carbon monoxide dissociation rate is unaffected. The abnormal properties of this hemoglobin variant can be atttributed to a more ‘relaxed’ T-state.     

我国西北地区49例Hb G Coushatta的分布——东北亚古代游牧民族的遗传标志

本文报道49例Hb G Coushatta在我国西北部的分布情况。新疆和甘肃的发生率为0.57‰和0.43‰,高于陕西的发生率0.07‰。维吾尔、哈萨克、柯尔克孜和回族的发生率为0.66‰—1.74‰,高于汉族的发生率0.45‰。Hb G Coushatta基因流呈由北向南和向西漂移和特点,结合国内外有关资料进行分析,这种变异体起源于东北亚地区,为古代游牧民族的遗传标志。     

子宫异常出血与细菌L型感染的关系

通常认为,子宫异常出血由内分泌紊乱、内膜肿瘤和子宫内膜炎引起。通过对471例子宫异常出血内膜组织的细菌学及免疫组化等研究,我们发现绝大多数(85.7％)出血者原因不明,其中376例子宫内膜查见L型菌。本组细菌L型感染率为93.8％。提示子宫异常出血(包括绝经后出血)与细菌L型感染关系也很密切。并认为,子宫内膜细菌L型感染是导致子宫异常出血的重要原因之一。选择作用于细菌胞膜的药物治疗细菌L型感染效果最好。     

Microbiological Identification and Analysis of Swine Lungs Collected from Carcasses in Swine Farms, China

The primary objective of this 3 years study was to determine the prevalence of porcine pathogens of the lungs of swine in swine farms in southern China. A total of 5,420 samples were collected from 200 swine farms. The bacterium that was most commonly isolated was Streptococcus suis, with 10.24 % of the samples being positive, 114 lungs (2.1 %) were positive for pseudorabies virus and 263 (4.85 %) were positive for classical swine fever virus; much lower than positive for PRRSV (15.1 %, p = 0.023) and PCV2 (13.8 %, p = 0.038). lungs that were positive for PRRSV and/or PCV-2 have significantly increased odds of being positive for any of the S. suis (9.79 vs. 0.44 %, p = 0.003).     

孕激素及人绒毛促性腺激素与药物流产后异常子宫出血的关系

目的:分析孕激素和人绒毛膜促性腺激素(h CG)与药物流产后异常子宫出血的关系。方法:选择2017年1月至2017年12月我院妇产科收治的药物终止妊娠的妇女150例,患者口服米非司酮配伍米索前列醇药物终止早期妊娠。将药物流产后子宫出血时间≤14 d作为对照组(n=75),14d作为异常组(n=75)。比较两组患者在药物流产后10 d、14 d、18 d、22 d血清中孕激素和h CG含量,分析两组患者孕激素和h CG含量相关性。结果:两组患者在年龄、月经周期、孕次、受孕天数、体重等方面比较无统计学差异(P0.05)。异常组在药物流产后10 d、14 d、18 d、22 d血清孕激素和h CG含量均高于对照组(P0.05)。两组患者在药物流产后10 d、14 d、18 d、22 d孕激素含量呈先降低再升高的趋势(P0.05)。对照组患者在药物流产后10 d、14 d、18 d、22 d血清hCG含量逐渐降低(P0.05);异常组在药物流产后10 d、14 d血清h CG含量比较无统计学差异(P0.05),在药物流产后18 d、22 d血清hCG含量低于药物流产后10 d、14 d,且药物流产后22 d低于药物流产后18 d(P0.05)。对全部样本的全部时点数据合并进行Pearson相关检验分析,孕激素和h CG含量呈正相关关系(P0.05)。结论:药物流产后异常子宫出血妇女血清的孕激素、hCG含量较高,两者呈正相关关系。药物流产后10 d、14 d监测血清HCG值无明显下降提示有异常子宫出血的可能,联合监测孕激素、hCG含量有利于药物流产后异常子宫出血的预测和治疗。     

慢阻肺患者运动负荷气道反应性与T细胞亚群的关系

摘要 目的：探讨与分析慢性阻塞性肺疾病（COPD）患者运动负荷气道反应性与T细胞亚群的关系。方法：2020年1月到2022年4月选择在本院诊治的慢阻肺患者88例作为慢阻肺组,同期选择在本院进行健康体检者88例作为健康组,检测两组T细胞亚群含量,判定两组的运动负荷气道反应性情况并进行相关性分析。结果：慢阻肺组的CD8⁺T淋巴细胞比例明显高于健康组,CD3⁺T淋巴细胞、CD4⁺T淋巴细胞比例明显低于健康组（P<0.05）。慢阻肺组的运动负荷气道反应性发生率为20.9 %,明显高于健康组的1.2 %（P<0.05）。在慢阻肺中,Spearsman分析显示运动负荷气道反应性发生率与CD3+T淋巴细胞、CD4⁺T淋巴细胞、CD8⁺T淋巴细胞比例存在相关性（P<0.05）。logistic回归分析显示CD3⁺T淋巴细胞、CD4⁺T淋巴细胞、CD8⁺T淋巴细胞比例都为影响运动负荷气道反应性发生的重要危险因素（P<0.05）。结论：慢阻肺患者多伴随有T细胞亚群异常,也多伴随有运动负荷气道反应性,运动负荷气道反应性与T细胞亚群存在相关性,也表明T细胞亚群紊乱是导致运动负荷气道反应性发生的重要因素。     

Statistical quality control of variety trial data

I propose detection criteria for identifying an abnormal or erroneous data vector provided by a single variety trial in a longer series of variety trials. The test criteria are based on the linear effects estimated separately for each studied trial using global variance components estimated from the whole series of variety trials. The criteria comprise three mutually independent test statistics. The first one is a quadratic form in the estimated fixed effects, the second one is a quadratic form in the estimated realized linear random effects not including the residual effects, and the third one is a quadratic form in the estimated realized residual effects. Under the null hypothesis defining a valid data vector, the three quadratics have independent chi2 distributions. Under natural alternative hypotheses, they have noncentral chi2 distributions. Decomposing the total variation of the data vector studied into quadratic forms due to different types of the realized linear effects intuitively justifies the resulting test criteria. The decomposition may also be used to show that the resulting tests are likelihood ratio tests. I further present computational procedures that allow us to dispense with the need for prior estimation of the linear effects.     

Abnormal growth of polyamine-deficient Escherichia coli mutant is partially caused by oxidative stress-induced damage

Polyamines participate in numerous cellular processes and are required for normal cell growth in Escherichia coli. In this study, we constructed a new polyamine-deficient E. coli mutant and investigated the physiological function of polyamines during normal aerobic growth conditions. We showed that the requirement for sulfur-containing, branched chain, and aromatic amino acids, which was exhibited in the sodA sodB double mutant faced with severe oxidative stress, was also true of the polyamine-deficient mutant during normal aerobic cell growth. Sorbitol, sucrose, mannose, 1,2-dihydroxybenzene-3,5-disulfonic acid (Tiron), an antioxidant that functions as an oxygen radical scavenger including z.rad;O(2)(-), and thiamine partially relieved the cell growth defect caused by polyamine depletion in a dose-dependent manner. As was the case for the cells treated with paraquat, the mutant had an elongated shape compared with the polyamine-proficient wild type. Decreased aeration also relieved the cell growth defect of the polyamine-deficient mutant. Finally, we confirmed that chloromethyl-2('),7(')-dichlorofluorescin diacetate (DCFH-DA), which is oxidized in a fluorescent product in the presence of various oxidants, also fluoresce in the polyamine-deficient cells. These results showed that abnormal growth of the polyamine-deficient E. coli mutant results partially from oxidative stress-induced damage and the mutant thus exhibits the requirement for antioxidant or specific nutritional amino acid during normal aerobic growth.