喹啉酸的电合成

喹啉经阳极氧化反应得到喹啉酸,研究结果表明电解温度在68℃,支持电解质为H2SO4（0.2mol/dm^3)和（NH4）2SO4（0.2mol/dm^3)混合溶液,电流密度为22.5mA/cm^2等条件下电解,产率为91.4%,电流效率为89.2%。     

Detecting homogeneous segments in DNA sequences by using hidden Markov models

In recent years there has been a rapid growth in the amount of DNA being sequenced and in its availability through genetic databases. Statistical techniques which identify structure within these sequences can be of considerable assistance to molecular biologists particularly when they incorporate the discrete nature of changes caused by evolutionary processes. This paper focuses on the detection of homogeneous segments within heterogeneous DNA sequences. In particular, we study an intron from the chimpanzee α-fetoprotein gene; this protein plays an important role in the embryonic development of mammals. We present a Bayesian solution to this segmentation problem using a hidden Markov model implemented by Markov chain Monte Carlo methods. We consider the important practical problem of specifying informative prior knowledge about sequences of this type. Two Gibbs sampling algorithms are contrasted and the sensitivity of the analysis to the prior specification is investigated. Model selection and possible ways to overcome the label switching problem are also addressed. Our analysis of intron 7 identifies three distinct homogeneous segment types, two of which occur in more than one region, and one of which is reversible.     

无机酸的结构与性能的关系

本文主要根据酸碱质子理论讨论了无机酸的结构与性能的关系，提出了比较无机酸强度的方法．     

脱乙酰甲壳素与谷氨酸菌体絮凝机理的探讨

本文采用脱乙酰甲壳素作絮凝剂对谷氨酸发酵液进行处理。研究了絮凝剂加入量及加入时混合方式等因素对谷氨酸菌体絮凝的影响。基于大量的实验材料及对絮粒的显微结构测定，探讨了谷氨酸菌体与脱乙酰甲壳素作用的絮凝机理，认为此机理为架桥机理。     

硫化铜精矿制备硫酸铜的试验研究

本文介绍了用内蒙古炭窑口硫铁矿的硫化铜精矿经硫酸化焙烧，硫酸浸出制备硫酸铜的工艺研究，着重阐述了酸浸过程中影响铜浸出率的多种因素。     

赛艇运动的生理生化研究综述

对近年国内公开发表的有关论文进行了综述，结果发现，对赛艇运动员生理生化方面的研究还主要集中在血色素、血乳酸方面，其他生理生化方面的研究还比较少，许多方面还需要进一步深入研究．     

核酸序列的亲─—疏水表示与相关分析

把核酸序列表示为单核苷酸──疏水标度序列并定义了相关函数．把核酸序列分为10大类，求出了每一类序列中外显子部分与内含子部分各阶相关函数的平均值．结果表明，相关函数平均值与生物进化有明显相关性．外显子部分有明显的3，6，9……阶正相关；内含子部分有明显的2，4……阶相关．     

Interval estimates for diatom-inferred lake pH histories

We investigate ordinary least-squares and Bayesian methods for constructing interval estimates for historical lake pH's inferred from diatom sediments. The Bayesian method explicitly models several forms of variability, including the sampling and classification variability of the diatom records, estimation variability, and measurement error in observed pH's. The two methods produce similar interval estimates, but the Bayesian model allows design recommendations to be made.     

pH计指示电位滴定法测定陈醋中的总酸及其不确定度评定

采用传统方法酿制的陈醋由于自身成分复杂,色泽黑紫,采用普通指示剂酸碱滴定法测定总酸,终点颜色变化易被其本色掩盖。文章采用pH计指示电位滴定法进行测定,具有设备简单、操作简便、精确度高等优点,减少了人为因素带来的影响。     

脑室注射γ-氨基丁酸对四种不同诱因胃溃疡发生的影响

本文观察了侧脑室注射不同浓度GABA(2、4、6μmol)对四种不同胃溃疡诱因(无水乙醇灌胃、消炎痛肌肉注射、冷束缚应激和0.2N盐酸灌胃)的影响。结果表明:GABA对乙醇诱导型及消炎痛诱导型胃溃疡有显著的加剧效应,并呈现明显的剂量—效应依赖关系;低剂量的GABA(2μmol)对冷束缚应激型胃溃疡有促进作用,而高剂量的GABA(4、6μmol)有抑制作用;GABA对盐酸诱导型胃溃疡有显著量—效依赖的抑制效应。这些结果提示:中枢GABA能机制既可加强也可抑制胃溃疡的形成,其最终效应可能取决于不同诱因的致溃疡机制、GABA对胃的作用及中枢其它神经内分泌机制的复杂关系。