The effect of nitric oxide on the growth of marine phytoplankton

The incubation experiments of Skeletonema costatum, Dicrateria zhanjiangensis nov. sp., and Platymonas sub-cordiformis, and those of Emiliania huxleyi were carried out in the Marine Physical Chemistry Laboratory in Ocean University of China and in the Marine Organic Geochemistry Laboratory in the University of Georgia respectively. Nitric oxide was added into the media when these marine microalgae were growing. We found the growth of these four microalgae were promoted or inhibited when nitric oxide of different concentrations was added one or two times each day during the cultivation process. The results are consistent with the influence of nitric oxide on the growth of high plants. The results show that nitric oxide may be a new factor of regulation and control for the phytoplankton growth in seawater.     

冰碛物建造型相及天秦运动的讨论

以往对冰碛物的研究，只重视其沉积特征及古地理的恢复。未讨论其建造型相，笔者通过对其沉积特征、产出构造环境的讨论，认为山麓冰碛物是造山期后的产物，属于磨拉石建造，大陆冰碛代表寒冷地区风化壳产物，可作底砾岩看待；冰蚀面可当作沉积间断面或寒冷地区的风化壳，并认为我国新元古代末期罗圈组及其相当层位的冰碛岩属磨拉石建造。由此推断在新元古代末期－早古生代初期存在一期未被认识的、在地史上具划时代意义的构造运动，命名为天秦运动，天秦运动是晋宁运动后的另一期构造运动，是新元古代与古生代的分界运动，时限在天秦运动。天秦运动是晋宁运动后的另一期构造运动，是新元古代与古生代的分界运动，时限在800Ma以后，700－540Ma是主构造期，前期以造山为主，后期以裂解为主，是Rodinia超大陆的裂解、古晋洲洋和古特提斯海形成期，扬子地块和塔里木地块先后从澳大利亚板块中裂解出来。     

Human-Environment Patterns of Metropolitan Spatial Restructuring:Atlanta,Georgia and Shanghai,PRC,1950-2000

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Weathering of an Arctic oil spill over 20 years: the BIOS experiment revisited. Baffin Island Oil Spill

A small experimental oil spill was conducted on the northern tip of Baffin Island Nunavut, Canada (72 degrees 31' N, 79 degrees 50' W) in August 1981, and the natural weathering of the oil has been followed by periodic visits. This paper reports on the chemical composition of oil collected in August 2001. The vast majority of the initial oil has gone, but small patches remain. Some samples remain essentially unaltered despite their 20 years of exposure to the elements, while others show that biodegradation and photooxidation can play important roles in removing the majority of the components of the oil. Using 17alpha(H)21beta(H)hopane as a conserved marker within the oil, we show that the most biodegraded sample has lost more than 87% of the hydrocarbons initially present, while another has lost a substantial proportion of its initial chrysene and alkylated congeners. Potential explanations for the different weathering patterns seen in samples collected from this small site are briefly discussed.     

天津蓟县东山隐爆角砾岩型金矿地质特征

天津蓟县东山金矿于1998年由天津地质二队与天津地质矿产研究所首次发现。该金矿的容矿围岩为超浅成次火山岩(斜长玢岩),与其紧密伴生的是超基性的隐爆角砾岩-橄辉云煌岩。该矿床属于与岩浆隐爆作用有关的具较大远景的金矿床,目前已确定1、2、4号矿脉具工业意义。其中4号矿脉经地表及硐探揭露,矿体连结成似筒状,延伸大于延长;矿石为微细粒浸染型,具中低品位(3×10-6～11×10-6),可见厚度5～10m,矿体地表厚度较大,具隐爆角砾岩型特征。     

油气生产中的人体健康风险评价

这篇报告叙述了油气生产基地的地面蓄水池对人身基本健康风险的调查和争议。风险评价表明，在将来的使用条件下，被污染的土壤不需铲除，也可以保护人类身体健康。依据这一结果，管理部门允许不铲除污染的土壤，从而节省先前准备改造工程的费用。研究结果表明：（１）好的基本健康风险评价能够挽救大量资源而不增加企业的责任；（２）在石油勘探和生产中采用基本健康风险评价确定改造和清除污染目标；（３）当健康风险评价计划受环境科学支持的时候，根据风险变化趋势批准不采取挖掘土壤的方法清除所有化学污染而终止了对基本计划的争议。     

亚洲夏季风期陆面影响：外部条件与内部反馈

本文通过对大气环流模式的平均气候模拟以及ＧＣＭ敏感性试验，比较外部条件和内部反馈的相对贡献，研究了海陆温差和亚洲夏季风强度的基本概念。