应用醋酸锌治疗犬的铜中毒

醋酸锌用来治疗两种犬的铜中毒。每种犬有２只治疗２年，另一只治疗一年。每天２００ｍｇ锌能达到治疗铜中毒的目的，使血浆锌浓度升高一倍，达到２００μｇ／ｄｌ并抑制口服铜的吸收。每天剂量后来降到５０－１００ｍｇ，以防止血浆锌浓度过分升高。初步临床效果良好。３只犬在给锌开始时有轻度的中度的肝病，肝铜浓度也高，２年后肝活组织检查，发现肝炎减轻，肝铜浓度降低。另一只没有活动性肝炎的犬，在两年时间肝铜浓度也降低了     

When biotas meet: understanding biotic interchange

When the barrier between biotas with long separate histories breaks down, species invade from one biota to the other. Studies of episodes of marine and terrestrial biotic interchange that have occurred during the last 20 million years show that large-scale extinction of species before the onset of interchange renders biotas especially prone to invasion. As environments and species are being exploited and eliminated on an ever increasing scale in the human-dominated biosphere, the geographical expansion of species from biotas in which evolution of high competitive, defensive, and reproductive abilities has proceeded the furthest will become more frequent. Historical events and interactions are essential ingredients for understanding the current and future structure and composition of the world's biota.     

A three-band hand-held radiometer for field use

A self-contained, hand-held radiometer designed for field use has been constructed and tested. The 4.5-kilogram device, consisting of a strap-supported electronics module and a hand-held probe containing three sensors, is powered by flashlight and transistor radio batteries, uses two silicon and one lead sulfide detector, has three liquid-crystal displays, features sample-and-hold radiometric sampling, and is spectrally configured to Landsat-D's thematic mapper bands TM3 (0.63 to 0.69 micrometer), TM4 (0.76 to 0.90 micrometer), and TM5 (1.55 to 1.75 micrometers). The device was designed to collect ground-truth data for the thematic mapper and to facilitate ground-based, remote-sensing studies of natural materials in situ. Prototype instruments were extensively tested under laboratory and field conditions, with satisfactory results.