美东地区罗德河流域地下水中铝形态分布的化学平衡模式计算

美东地区的罗德河流域遭受着严重的酸沉降侵蚀．在酸性条件下,铝从土壤中大量溶解并迁移到水环境中．地表水中升高的铝浓度对鱼类产生毒害,监测地表水和土壤水中的铝形态及浓度变化已成为问题的关键．本文报导了用化学平衡模式计算法分析美东地区罗德河流域地下水中的铝形态分布,获得了有价值的结论     

A massive phytoplankton bloom induced by an ecosystem-scale iron fertilization experiment in the equatorial Pacific Ocean

The seeding of an expanse of surface waters in the equatorial Pacific Ocean with low concentrations of dissolved iron triggered a massive phytoplankton bloom which consumed large quantities of carbon dioxide and nitrate that these microscopic plants cannot fully utilize under natural conditions. These and other observations provide unequivocal support for the hypothesis that phytoplankton growth in this oceanic region is limited by iron bioavailability.     

Anthropologist fired: Stanford plays its China card

The ethical obligations of Western anthropologists working in the People's Republic of China became an issue recently when Stanford University's anthropology department unanimously decided to dismiss doctoral candidate Steven Mosher because of his conduct while in an unnamed Chinese village. Mosher maintains that the dismissal was in retaliation for his publishing an article in a Taiwanese weekly about the practices of forced third trimester abortion and infanticide in the village. Neither Stanford nor Mosher has revealed the specific reasons for the dismissal.     

Expected change: U.S. recombinant DNA guidelines

Continuing the trend towards relaxing controls on recombinant DNA research, the National Institutes of Health published revised guidelines in the Federal Register of 21 April 1982. Although the existing system of mandatory controls and institutional biosafety committees is retained, no class of experiments will be totally prohibited, and the guidelines dealing with containment levels have been greatly simplified.