Dynamic response of chlorsulfuron herbicide to nitrogen mineralization and the ratio of microbial biomass nitrogen to nitrogen mineralization in the soil

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Fragile X demonstrated retrospectively in amniotic cells cultured in low folate medium

Chromosome analysis in a boy aged 10 months, with psychomotor retardation, revealed the fragile X-chromosome in lymphocytes and skin fibroblasts cultured in low folate medium (TC 199). Amniocentesis and chromosomal analysis had been carried out during pregnancy because of advanced maternal age. Review of the slides from amniotic fluid cells grown routinely in low folate medium showed the marker X in 10.6 per cent of the metaphases. Possible explanations for the appearance of the marker X in amniotic cell culture are discussed.     

Fouling and cleaning of membrane--a literature review

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Prenatal diagnosis of X-linked mental retardation with fragile (X) using fetoscopy and fetal blood sampling

Pure fetal blood, (uncontaminated with maternal blood), was obtained from two male fetuses at risk for X-linked mental retardation with fragile(X) at Xq27–28 by direct vision fetoscopy and fetal blood sampling. Both were shown to have this fragile site on the X chromosome while nine other fetal blood samples from pregnancies at risk for other X-linked diseases, or haemoglobinopathies did not show fragile sites at Xq27–28, and a blood sample from an abortus showed only 1 fragile site in 95 mitoses. Both pregnancies were terminated, cultures established from fetal tissues, and the diagnosis confirmed in each case. The problems of demonstrating the fragile site in tissues other than fetal blood in these pregnancies (such as amniotic fluid cells or fibroblasts from fetal tissues) are discussed.     

Decolorization and kinetics of photo oxidizing cationic blue X-GRL by UV/H2O2 system

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学校图书信息管理系统设计

图书管理系统是典型的信息管理系统（MIS），本文主要介绍后台数据库的建立、维护及前端应用程序开发两个方面．该系统采用BIS架构，将图书入库、查询、借阅、维护、用户信息等功能集成在一起，具有用户介面友好、操作简单、数据安全、功能强大、实用性强的特点．     

Prenatal diagnosis of 45,X/46,XY mosaicism in a fetus with asymmetric gonadal dysgenesis

An 18 week abortus had been prenatally diagnosed as a 45,X/46,XY mosaic. The fetus was a phenotypic male with glandular hypospadias, a horseshoe kidney and asymmetric gonadal dysgenesis. This case represents a rare instance of prenatally diagnosed 45,X/46,XY mosaicism with an abnormal phenotype.     

土壤环境中活性X-3B红染料的淋溶行为与淹水释放模拟研究

采用土柱模拟实验对土壤环境中活性X－3B红染料的淋溶行为及向下迁移能力进行研究，结果表明，活性X－3B红染料这一有机污染物在土壤中的淋溶及向下迁移是一指数函数可以表达的动态过程，其可淋失能力因土壤类型不同而有较大的差异，其顺序为：褐土＞棕壤＞红壤＞水稻土，究其原因，主要与土壤本身的各理化特性有关，即可淋失能力不仅与土壤粘粒和有机质含量存在显著负相关，与土壤pH值存在显著正相关，土壤阳离子交换量也对其可淋失能力具有一定的贡献，是土壤各理化特性的综合。此外，通过污染土壤淹水实验，初步确定土壤中活性X－3B红染料具有释放到地表水体中的较大环境风险。     

Early prenatal diagnosis of the fragile site AT Xq27.3 associated with Martin-Bell syndrome

Early prenatal diagnosis of the fragile X was attempted in 44 pregnancies, including one twin pregnancy at risk of Martin-Bell (MB) syndrome. The sex ratio was 24M:21F. The fragile site was reproducibly demonstrated in cultured chorionic villus (CV) cells in eight male and five female fetuses. Six of the male and three of the female fetuses were terminated. Simultaneous RFLP analysis provided confirmative data with flanking DNA markers in 3 of 13 analysed cases. Recombination and/or non-informativeness at available distal and/or proximal loci were found in nine cases. In one male fetus, discordance between the haplotype and cyto-genetics (fragile-X-negative) suggested the presence of a normal male transmitter, a double meiotic cross-over within the region, or a false-negative cytogenetic diagnosis. However, discordance between prenatal and post-termination/postnatal cytogenetic findings was not observed in this series. The use of excess thymidine for induction of the fragile X in cultured CV cells provided in the majority of cases a safe and rapid method for cytogenetic diagnosis, with options for early induced termination in fragile-X-positive pregnancies, for simultaneous RFLP analysis, and for subsequent second-trimester analysis of fetal blood in complicated cases.