Effect of methyl mercury induced free radical stress on nucleic acids and protein: Implications on cognitive and motor functions

Mercury pollution and acute neurotoxicity of mercury is well known. The recent reports suggest the adverse effect of low dose mercury, though the available literature is still silent on its mechanism. This study was therefore undertaken to probe the effect of low dose methyl mercury induced heavy metal toxicity on free radical stress and its impact on behaviour of male albino rats. Male albino rats were exposed to 1 mg/kg body wt of methylmercury chloride for seven days, on day 8 they were tested for motor and memory functions. They were sacrificed later for biochemical estimations for rate of lipid peroxidation, nucleic acids, proteins in cerebrum, cerebellum and brain stem. There was an increase in the rate of lipid peroxidation showing methyl mercury induced free radical stress. The motor and memory functions demonstrated a clear decline, besides there was a lowering in the levels of nucleic acids and proteins as compared to controls. The results are important in view of recent reports that methyl mercury induced free radical stress results in early ageing and may serve as an initiating factor more specifically for neurodegenerative disorders like Alzeihemer's disease and dementias. The current findings support the notion that incorporating dietary antioxidants like curcumin, ascorbic acid and α-tocopherol in routine diet from early age may help combat the risk of developing such disorders in ensuing years.     

汞-头孢唑林钠体系中汞的分光光度法测定

研究了汞与头孢唑林钠的显色反应，在pH=3．8的HAc-NaAc缓冲溶液中，汞（Ⅱ）与头孢唑林钠形成1：1的配合物，其最大吸收波长位于530nm处，汞（Ⅱ）的浓度在0～20mg／L范围之间符合郎伯比耳定律。     

YYG-2A型冷原子荧光测汞仪测定痕量汞分析方法改进

章对冷原子荧光测汞仪在测量中的分析方法进行了改进，使分析方法的准确度和灵敏度都有了较好的提高。为准确测量环境中污染物汞探索出了最佳的工作条件。     

Unnatural Disasters: Two Calculus Projects for Instructors Teaching Mathematics for Social Justice

Abstract

We provide context and motivation for an instructor to use real-life examples in the calculus classroom. To this end we describe two specific project ideas, one related to the devastating impact of methylmercury fungicide in a grain seed supply and the other to a catastrophic methane leak. By using calculus in contexts that have social justice implications, we hope to empower students to reason for themselves, to use mathematics as a powerful tool to deepen their understanding of the world, and ultimately, to effectively confront the challenges society faces.     

除砷技术研究现状

介绍含砷废水对人类的危害，阐述除砷材料和含砷废水的处理方法的发展情况，以及各种除砷技术的优缺点．总结出在各种除砷方法中生物除砷将是最有发展前景的方法。     

微创颅内血肿清除术的观察与护理

本文目的是总结微创颅内血肿清除术的护理体会;方法是回顾分析我院附属医院2000年4月至今86例微创颅内血肿清除术的术前准备、手术配合、术后护理;结果是除13例极重症脑出血患者死亡外,其余人恢复满意。结论是良好的术前准备和手术配合,术后保持呼吸道通畅,严格控制血压,做好引流管护理、高热护理和预防压疮的护理,对成功抢救脑出血患者起了十分重要的作用。     

战后美国对日本战争赔偿政策的转换及其严重后果

二战后日美国家间战争赔偿经历了惩罚性的“拆迁赔偿”与象征性的“协议赔偿”两个阶段。战后初期，美国远东政策的战略目标是：彻底根除日本的战争潜能，使之不再成为美国的威胁，以“拆迁赔偿”的方式．强制日本把被指定的工业设备赔付给曾被日本占领和破坏的国家．重点是支持蒋介石国民政府，以遏制苏联对东亚的影响。但随着中国解放战争形势的变化和美、苏冷战的加剧，美国一改先前对日本打击的政策为利用和扶植日本，对日本的赔偿政策也转换为旧金山《对日和约》中规定的“协议赔偿”。美国对日战争赔偿政策的转换，严重损害了被日本侵略过的亚洲国家的利益，使原来战胜国对战败国之间的惩罚性赔偿变为日本和索赔国之间对等的象征性协议赔偿，致使赔偿性质和赔偿方式发生了根本变化，从而导致战后日本经济重新对外扩张、军国主义重新复活、拒不承认战争加害和战争责任、战争史观日益右翼化、亚太地区形势长期紧张等严重后果。     

凤尾菇菌丝体汞吸收特性研究

以市场常见凤尾菇为材料,在Pachlewski中培养2周后,菌丝体置于在2mg·kg-1Hg2 浓度的吸收液中,分别加入0.5mM的EDTA、CaH2PO4,并设置吸收液不同pH(3．8,8．5)。经一定的时间间隔(5、10、20、40、60、120、180min),连续测定吸收液中汞浓度的变化情况,研究凤尾菇菌丝体的汞吸收特性。结果表明,在加入CaH2PO4、EDTA以及不同环境pH下,吸收液中总汞浓度的呈指数下降规律,符合主动吸收的规律。180分钟时,经不同大小的菌丝体吸收后,相同处理吸收液中总汞的残留量非常一致,但不同处理有显著差异;不同单因子条件下汞残留浓度的差异,反映出处理因子对凤尾菇菌丝体汞吸收特性的影响。     

小球藻生物吸附废水中铜的研究

以小球藻作为生物吸附剂,去除水溶液中微量Cu~(2+),研究结果表明小球藻对Cu~(2+)的生物吸附主要经历了快速的吸附和缓慢的吸收两个步骤:pH值是影响Cu~(2+)生物吸附的一个重要影响因素,最佳pH值在6～8之间;离子强度对Cu~(2+)的吸附有一定的抑制作用;小球藻对Cu~(2+)的生物吸附符合Freundlich等温方程。     

甜樱桃增梢技术初探

甜樱桃芽苗定植后第一年到第二年夏季进行连续摘心,第二年冬季进行短剪,能有效地促使樱桃一年多次抽梢、增加枝量、扩大树冠、提早成形.