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Summary Actinomycin D causes a marked increase of alkaline phosphatase activity in the zona subcorticalis of the developing rat kidney. The effect is more pronounced in female than in male animals. Acid phosphatase activity increases in males only. 相似文献
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Ch. Pilgrim 《Cellular and molecular life sciences : CMLS》1967,23(11):943-943
Summary In hypothalamic neurosecretory nuclei of rats subject to water withdrawl for 1–14 days, a marked increase in the activities of histochemically detected acid phosphatase, thiamine pyrophosphatase and glucose-6-phosphate dehydrogenase is observed. LDH and SDH activities do not change. Two different cell types can be distinguished by means of the acid phosphatase and TPPase reactions. 相似文献
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Effectiveness of the global protected area network in representing species diversity 总被引:7,自引:0,他引:7
Rodrigues AS Andelman SJ Bakarr MI Boitani L Brooks TM Cowling RM Fishpool LD Da Fonseca GA Gaston KJ Hoffmann M Long JS Marquet PA Pilgrim JD Pressey RL Schipper J Sechrest W Stuart SN Underhill LG Waller RW Watts ME Yan X 《Nature》2004,428(6983):640-643
The Fifth World Parks Congress in Durban, South Africa, announced in September 2003 that the global network of protected areas now covers 11.5% of the planet's land surface. This surpasses the 10% target proposed a decade earlier, at the Caracas Congress, for 9 out of 14 major terrestrial biomes. Such uniform targets based on percentage of area have become deeply embedded into national and international conservation planning. Although politically expedient, the scientific basis and conservation value of these targets have been questioned. In practice, however, little is known of how to set appropriate targets, or of the extent to which the current global protected area network fulfils its goal of protecting biodiversity. Here, we combine five global data sets on the distribution of species and protected areas to provide the first global gap analysis assessing the effectiveness of protected areas in representing species diversity. We show that the global network is far from complete, and demonstrate the inadequacy of uniform--that is, 'one size fits all'--conservation targets. 相似文献
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