The Schooling Experience of Adolescent Boys with AD/HD: An Australian Case Study

This study explored the experience of schooling of six adolescent boys diagnosed with AD/HD from the perspectives of the boys, their mothers and their teachers. The study utilised social constructionism as the theoretical orientation and the Dynamic Developmental Theory (DDT) of AD/HD as the explanatory framework. Utilising a multiple, instrumental case-study, data were collected by means of semi-structured individual and focus group interviews as well as a review of school reports across a two year period. Findings of the study suggest that taking medication as prescribed together with supporting the students to make and manage friendships, utilising classroom strategies that support learning, and providing an engaging classroom environment are important considerations to promote a positive schooling experience for adolescents with AD/HD.     

FDP对罗非鱼吸收、降解DDT的影响

罗非鱼能较快的吸收水体中的DDT并在6h达到积累高峰，DDT在各器官的分布是不均匀的，按24h放射性活度的高低排列是：肝胰脏、胆囊、肠、脑、鳃和肌肉．肝胰脏在24h的浓集系数为48477，是肌肉的57倍．纯中药鱼病保护剂──FDP能促进罗非鱼对DDT的吸收和降解．罗非鱼经FDP浸泡后，在暴露于14C－DDT6h内，能普遍的提高各器官对DDT的吸收能力．肝胰脏积累DDT的能力加强，达对照组的1．69倍．24h经FDP处理的罗非鱼肝胰脏的总放射性活度明显下降，极性降解产物比例增加．说明FDP对罗非鱼的肝胰脏的解毒功能有促进作用．     

岩溶地下河水体中有机氯农药研究

通过气相色谱对青木关地下河水体中有机氯农药(OCPs)进行检测。检测结果显示,总有机氯含量范围为0.61～46.97 ng.L-1,且已测的15种有机氯农药组分均有不同程度地检出。地下河进口附近的农田是影响该地下河污染的主要来源。与国内外其他河流比较得出,地下河污染水平处于中游,但不容乐观。     

连二亚硫酸钠对淹水土壤中p,p'-DDT 脱氯过程的影响及机理研究

在淹水培养条件下(土/水=2 g/40 mL),研究连二亚硫酸钠(200 mmol/L Na₂S₂O₄)对p,p'-DDT在自然土和Na₂S₂O₄还原土壤中降解历程的影响及机理. 在自然土和还原土中添加Na₂S₂O₄促进p,p'-DDT降解,2 d降解率分别为73%和79%,随后降解缓慢. p,p'-DDT在土壤中降解为p,p'-DDD和p,p'-DDE. p,p'-DDT主要被Na₂S₂O₄降解,Na₂S₂O₄还原土壤产生的Fe²⁺也有贡献. Na₂S₂O₄与Fe²⁺体系对修复DDTs污染土壤有应用前景.     

气相色谱法测定土壤中有机氯杀虫剂

建立了利用加速溶剂萃取和GC-ECD联用技术,对土壤中六六六、滴滴涕、艾氏剂、狄氏剂、硫丹、硫丹、硫丹硫酸盐内氯甲桥奈、内氯甲桥奈醋醛、七氯、环氧七氯17有机农药进行了分析,通过对回收率、重现性及精密度的测定,其实验具有操作简便,时间短,应用范围广的优点。     

贵州湄潭茶产区土壤中残留六六六、滴滴涕的检测研究

采用气相色谱法对贵州省遵义市湄潭县6个茶园产区土壤中有机氯农药六六六、滴滴涕的残留进行了分析。其结果表明,茶园产区一、二、四、五、六的土壤样品均未检测出六六六和滴滴涕的存在,而在茶园产区三土壤样品检测出六六六,残留量小于0.05mg/kg。分析结果表明6个产区的土壤品质较好,能保证茶叶质量的可靠性。