The Leopard's Tale: Revealing the Mysteries of Çatalhöyük

The Leopard's Tale: Revealing the Mysteries of Çatalhöyük . Ian Hodder. New York: Thames and Hudson, 2006. 288 pp.     

Inhibitory and lethal effects of chlorhexidine and a polymeric biguanide on some strains of Providencia stuartii

The effects of chlorhexidine diacetate and vantocil IB on the viability of Providencia stuartii strains are described. Exposure of Prov. stuartii strains to different concentrations of chlorhexidine in broth culture resulted in a decrease in viability over the first 6 h, followed by regrowth. During incubation, bacteria adhered to the surface of the culture vessel and multiplied despite the presence of a bactericidal concentration of the drug in the medium. It is concluded that the phenomenon of 'regrowth' results from adhesion to glass containers and the subsequent dispersal of some of these cells into the culture medium.     

Recurrent response patterns of a zooplankton community to whole-lake fish manipulation

1. In a series of whole-lake manipulations conducted from 1984 to 1991, planktivorous fishes were alternately removed and restocked in a small mesotrophic lake, resulting in dramatic changes in the zooplankton community. 2. Response patterns in the zooplankton community, which include species and size structure, and within-year community variability, were examined. Variation in the zooplankton community in unmanipulated years was much lower than that in manipulated years, regardless of direction of the manipulation (i.e. decreasing or increasing planktivory). 3. The succession of zooplankton species abundance was repeated in the second removal of planktivorous fishes. The community shifted from small-bodied cladocerans, copepods and rotifers, through an intermediate state with high abundance of Holopedium, to an assemblage dominated by large-bodied daphnids.     

血管活性肠多肽结合核苷酸性质的研究

采用光亲和技术检测了血管活性肠多肽(VIP)与核苷酸之间的相互作用,发现VIP可以特异性结合同位素标记的GTP,还发现未标记的GTP以及其它三磷酸核苷抑制这种结合,这意味着VIP与上述三磷酸核苷之间的结合是一种典型的可逆性的结合反应.发现低浓度的GDP,GMP不但不抑制VIP与同位素标记GTP的结合反应,反而增强这种结合.联系到其它研究者关于GTP影响VIP与其受体结合反应的结果,可认为VIP能可逆性地连接一种三磷酸核苷,这种连接受反应系统中不同核苷酸比例影响,通过这种连接来调节VIP与其受体之间的反应.