WILLIAM MCMURTBIE     

Hart E 《Science (New York, N.Y.)》1913,38(971):185-187

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Testosterone regulation of sexual reflexes in spinal male rats   总被引：1，自引：0，他引：1  

B L Hart 《Science (New York, N.Y.)》1967,155(767):1283-1284

Castrated male rats with complete midthoracic spinal transections were maintained on exogenous testosterone; they showed intermittent clusters of genital responses consisting of erections, quick flips, and long flips of the penis when gentle pressure was con stantly applied to its base. The number of these genital responses per 30-minute test was markedly influenced by withdrawal or administration of testosterone.  相似文献   

El chichon: composition of plume gases and particles     

Kotra JP  Finnegan DL  Zoller WH  Hart MA  Moyers JL 《Science (New York, N.Y.)》1983,222(4627):1018-1021

Aircraft measurements were made of trace gases, atmospheric particles, and condensed acid volatiles in the plume of El Chichón volcano, Chiapas, Mexico, in November 1982. Hydrogen sulfide was the primary gaseous sulfur species in the plume at the time of collection. Concentrations of 28 elements were determined by neutron activation analysis of particulate material from the plume. Rates of trace element emission to the atmosphere for each species were estimated by normlization to the simultaneously determined total sulfur emission rate. The volatile elements sulfur, chlorine, arsenic, selenium, bromine, antimony, iodine, tungsten, and mercury were enriched relative to bulk pyroclastic material by factors of 60 to 20,000. Arsenic, antimony, and selenium were associated predominantly with small (>/= 3 micrometer) particles. Calcium and sodium were present almost exclusively on larger particles and aluminum and manganese were bimodally distributed. Ashladen particulate material injected into the stratosphere during the early violent eruptions was enriched by factors of 10 to 30 relative to ash in some of the same elements observed in the quiescent plume.  相似文献   

Radiation Chemistry: Aqueous Media     

Hart EJ 《Science (New York, N.Y.)》1963,141(3576):195-199

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Conversions     

Hart PJ 《Science (New York, N.Y.)》1960,132(3421):256

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Electron microscopy of unstained biological material: the polytropic montage   总被引：3，自引：0，他引：3  

R G Hart 《Science (New York, N.Y.)》1968,159(3822):1464-1467

With use of an electronic picture-scanning device and a digital computer, electron micrographs taken of a specimen along several different directions can be superimposed to form a montage that is more informative than the component images. Preliminary results indicate that one may thus study unstained, unshadowed biological material at high resolution.  相似文献   

Genetic Variation in Enzyme Phenotypes among Yugoslav Wheat Cultivars     

L. Vapa  G. E. Hart 《Plant Breeding》1987,98(4):273-280

The zymogram phenotypes of 14 enzymes were determined for 80 Yugoslav wheat cultivars in order to identify probable allelic variants at structural gene loci. Enzyme phenotypes that differ from the one produced by Triticum aestivum cv.‘Chinese Spring’ were detected for six enzymes, namely, aromatic alcohol dehydrogenase-1, aconitase-1, amino peptidase-l, lipoxygenase-1, NADH dehydrogenase-1 and endopeptidase-1, and one or more probable allelic variants at the Aadb-B1, Aco-A1, Aca-B1, Amp-Al, Amp-B1, Ep-A1, Ep-B1, Lpx-A1, Lpx-B1 or Lpx-D1, and Ndh-B1 loci were identified.  相似文献   

The Behavior and Ecology of Pacific Salmon and Trout     

Paul J. B. Hart 《Fish and Fisheries》2006,7(1):75-76

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Inland Fisheries: Ecology and Management     

Paul J. B. Hart 《Fish and Fisheries》2002,3(2):139-140

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Interpreting the spatio-temporal patterns of sea turtle strandings: Going with the flow     

Kristen M. Hart  Peter Mooreside  Larry B. Crowder 《Biological conservation》2006,129(2):283-290

Knowledge of the spatial and temporal distribution of specific mortality sources is crucial for management of species that are vulnerable to human interactions. Beachcast carcasses represent an unknown fraction of at-sea mortalities. While a variety of physical (e.g., water temperature) and biological (e.g., decomposition) factors as well as the distribution of animals and their mortality sources likely affect the probability of carcass stranding, physical oceanography plays a major role in where and when carcasses strand. Here, we evaluate the influence of nearshore physical oceanographic and wind regimes on sea turtle strandings to decipher seasonal trends and make qualitative predictions about stranding patterns along oceanfront beaches. We use results from oceanic drift-bottle experiments to check our predictions and provide an upper limit on stranding proportions. We compare predicted current regimes from a 3D physical oceanographic model to spatial and temporal locations of both sea turtle carcass strandings and drift bottle landfalls. Drift bottle return rates suggest an upper limit for the proportion of sea turtle carcasses that strand (about 20%). In the South Atlantic Bight, seasonal development of along-shelf flow coincides with increased numbers of strandings of both turtles and drift bottles in late spring and early summer. The model also predicts net offshore flow of surface waters during winter - the season with the fewest relative strandings. The drift bottle data provide a reasonable upper bound on how likely carcasses are to reach land from points offshore and bound the general timeframe for stranding post-mortem (< two weeks). Our findings suggest that marine turtle strandings follow a seasonal regime predictable from physical oceanography and mimicked by drift bottle experiments. Managers can use these findings to reevaluate incidental strandings limits and fishery takes for both nearshore and offshore mortality sources.  相似文献