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101.
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Peter A. Benn Mitchell Sugarman M. Alba Greco Gloria Harris George B. Deguire Lillian Y. F. Hsu 《黑龙江环境通报》1982,2(4):309-312
The first prenatally diagnosed case of 49,XXXYY is reported. The pathological findings of the fetus included bilateral clinodactyly, decreased carrying angles (OO), and hypertelorism, slightly low set ears and mildly prominent forehead. A minimum of two independent non- disjunctional events are postulated for this polysomy to arise. 相似文献
104.
For many years emission nebulae like the Great Nebula in Orion were considered essentially as ionized hydrogen clouds (HII regions) to be understood with the methods of plasma physics. Infrared observations at wavelengths between 1 and 20 μm from the ground, and in the far infrared (20 μm-1 mm) from above the atmosphere, have shown these regions to be strong infrared emitters. This radiation is due to thermal emission of dust mixed with the gas and heated by hot young stars. HII regions indicate recent star formation, and close to these regions many other signposts of early stellar development can be studied in the infrared. 相似文献
105.
Effects of engine speed and accessory load on idling emissions from heavy-duty diesel truck engines 总被引:1,自引:0,他引:1
Brodrick CJ Dwyer HA Farshchi M Harris DB King FG 《Journal of the Air & Waste Management Association (1995)》2002,52(9):1026-1031
A nontrivial portion of heavy-duty vehicle emissions of NOx and particulate matter (PM) occurs during idling. Regulators and the environmental community are interested in curtailing truck idling emissions, but current emissions models do not characterize them accurately, and little quantitative data exist to evaluate the relative effectiveness of various policies. The objectives of this study were to quantify the effect of accessory loading and engine speed on idling emissions from a properly functioning, modern, heavy-duty diesel truck and to compare these results with data from earlier model year vehicles. It was found that emissions during idling varied greatly as a function of engine model year, engine speed, and accessory load conditions. For the 1999 model year Class 8 truck tested, raising the engine speed from 600 to 1050 rpm and turning on the air conditioning resulted in a 2.5-fold increase in NOx emissions in grams per hour, a 2-fold increase in CO2 emissions, and a 5-fold increase in CO emissions while idling. On a grams per gallon fuel basis, NOx emissions while idling were approximately twice as high as those at 55 mph. The CO2 emissions at the two conditions were closer. The NOx emissions from the 1999 truck while idling with air conditioning running were slightly more than those of two 1990 model year trucks under equivalent conditions, and the hydrocarbon (HC) and CO emissions were significantly lower. It was found that the NOx emissions used in the California Air Resources Board's (CARB) EMFAC2000 and the U.S. Environmental Protection Agency's (EPA) MOBILE5b emissions inventory models were lower than those measured in all of the idling conditions tested on the 1999 truck. 相似文献
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Jennifer L. Harris Kevin MacIsaac Kent D. Gilkinson Ellen L. Kenchington 《Marine Biology》2009,156(9):1891-1902
Ophiura sarsii was collected in May/June from Banquereau Bank off Nova Scotia, Canada as part of the benthic fauna analyzed in a 2 year
clam dredging-impact experiment. In total, 529 O. sarsii specimens were analyzed; 174 (33%) had stomach contents while the rest were empty. Ophiura sarsii is a trophic generalist feeding on at least 31 taxa (52% identified to species) drawn from four phyla: Arthropoda (81.8%),
Annelida (13.2%), Mollusca (3%), and Cnidaria (1.5%). However, the diet was largely restricted to two amphipod families (Ampeliscidae
and Lysianassidae), accounting for 54–70% of stomach contents at any one sampling period. This diet provides indirect evidence
for carnivory. Limited spatial and temporal heterogeneity in the proportion of animals feeding showed no consistent pattern.
Where diet composition differed (ANOSIM) it was attributed to the proportion of lysianassid and ampeliscid amphipods consumed.
Dredging introduced new dietary items, although diet composition was not significantly altered. 相似文献
109.
Xinde Cao Lena Ma Aziz Shiralipour Willie Harris 《Environmental science and pollution research international》2010,17(3):586-594
Background, aim, and scope
Composting is being proposed as a pretreatment step before disposal of metal-rich biomass after phytoextraction process. This study determined the biomass reduction and arsenic transformation during composting As-rich biomass of hyperaccumulator Chinese brake fern (Pteris vittata L.). 相似文献110.
Particulate copper in soils and surface runoff from contaminated sandy soils under citrus production
Santanu Bakshi Zhenli L. He Willie G. Harris 《Environmental science and pollution research international》2013,20(12):8801-8812
Soil contamination by copper (Cu) is a worldwide concern. Laboratory incubation and soil Cu characterization were conducted to examine the effects of external Cu loading and liming on Cu speciation in both bulk soil and particulates of an Alfisol and Spodosol under citrus production. Also, drainage water from the sites was evaluated for dissolved and particulate forms of Cu. Soil available Cu estimated by CaCl2, NH4OAc, or Mehlich-3 extraction significantly increased with external Cu loads and decreased with soil pH. Most increases in soil Cu occurred in the exchangeable and oxide-bound fractions. Organically bound Cu was the dominant fraction in both bulk soil and particulates, but more in particulates than bulk soil (P?≤?0.001). Organically bound Cu was highly correlated with total recoverable Cu (P?≤?0.01), increased significantly with external Cu loads (P?≤?0.001), and decreased with soil pH (P?≤?0.05). Lime addition converted part of Cu from available pools to more stable forms. Organically bound Cu complexes were found to dominate in soil solution or surface runoff. These results indicate that most Cu accumulated in the contaminated soils is highly mobile, and thus may impact citrus production and the environment. 相似文献