超痕量锌测定过程中的污染来源及其消除方法

本文探讨了测定超痕量锌时的污染来源和消除方法。建立了一个不必予先富集,可以避免环境和试剂污染,直接测定水中1μg/1锌的石墨炉原子吸收分析方法。并成功地用于美国环境保护局(EPA)标准水样中锌的测定。本方法可以将锌的空白值控制在0.3μg/1左右,检出限达到0.11μg/1,1μg/1锌的相对标准偏差为5.6％,回收率在110—92％之间。

裂解气相色谱法讲座Ⅰ——裂解气相色谱法概述

裂解气相色谱法(Pyrolysis Gas Chromatography,简称PGC)是在热裂解和气相色谱两种技术的基础上发展起来的。自1954年W.H.T.Davison等人首先对高聚物的裂解产物进行气相色谱分离记出谱图而加以鉴别以来,经过S.B.Martin,R.S.Lehrle等人把高聚物的裂解技术直接同气相色谱仪连结在一起,由此建立了裂解气相色谱法。三十多年来,通过对裂解装置的不断改进和完善,以及采用毛细管分离、程序升温和微处理机系统,这一方法不仅广泛应用于高分子领域,并且也在微生物、生物、医学、药物、司法检验、地质、矿物燃料等方面得到了日益增长的应用。而方法本身,也从一种经验式的技术,发展为一门相对独立的分枝学科,成为同红外光谱法和核磁共振法相辅相成的分析和研究高分子及非挥发性有机化合物的不可缺少的有效的方法。

GENETIC MAPPING OF THE LAMINARIA JAPONICA (LAMINARALES, PHAEOPHYTA) USING AMPLIFIED FRAGMENT LENGTH POLYMORPHISM MARKERS

To establish a molecular-marker-assisted system of breeding and genetic study for Laminaria japonica Aresch., amplified fragment length polymorphism (AFLP) was used to construct a genetic linkage map of L. japonica featuring 230 progeny of F-2 cross population. Eighteen primer combinations produced 370 polymorphic loci and 215 polymorphic loci segregated in a 3:1 Mendelian segregation ratio (P <= 0.05). Of the 215 segregated loci, 142 were ordered into 27 linkage groups. The length of the linkage groups ranged from 6.7 to 90.3 centimorgans (cM) with an average length of 49.6 cM, and the total length was 1,085.8 cM, which covered 68.4% of the estimated 1,586.9 cM genome. The number of mapped markers on each linkage group ranged from 2 to 12, averaging 5.3 markers per group. The average density of the markers was 1 per 9.4 cM. Based on the marker density and the resolution of the map, the constructed linkage map can satisfy the need for quantitative trait locus (QTL) location and molecular-marker-assisted breeding for Laminaria.