Virus Occurrence and Transport in a School Septic System and Unconfined Aquifer   总被引：5，自引：0，他引：5  

Dan C. DeBorde  William W. Woessner  Bruce Lauerman  Patrick N. Ball 《Ground water》1998,36(5):825-834

  相似文献   

Baseline levels of benzo(a)pyrene in southern California mussels     

Bruce P. Dunn  David R. Young   《Marine pollution bulletin》1976,7(12):231-234

Marine mussels accumulate the carcinogen benzo(a)pyrene from contaminated environments. Baseline studies in California indicate that levels of the carcinogen in mussels are at or near zero, except in areas of human activity. This finding runs counter to previous suggestions that benzo(a)pyrene is widely distributed in marine organisms.  相似文献   

Earthquake Prediction,Developments in Solid Earth Geophysics, 9: Tsuneji Rikitake. Elsevier Scientific Publishing Co., Amsterdam-Oxford-New York,N.Y., 1976, 357 pp., 138 illus., 24 tables,Dfl. 95.00/US $39.75     

Bruce A. Bolt 《Physics of the Earth and Planetary Interiors》1976,12(1):87-89

  相似文献   

An inverse method for earthquake source mechanisms     

Bruce R. Julian 《Tectonophysics》1978,49(3-4)

  相似文献   

Direct counts of bacteria in the sediments of a North Carolina salt marsh     

Parke Rublee  Bruce E. Dornseif 《Estuaries and Coasts》1978,1(3):188-191

The number of bacteria in sediments of a North Carolina salt marsh was determined by direct counts with epifluorescent illumination and acridine orange stain. Cell number decreased from 8.36–10.90×10⁹ cells/cm³ of sediment at the surface to 2.19–2.58×10⁹ cells/cm³ of sediment at a depth of 20 cm. No significant difference was found among four stations located on a transect which crossed the marsh and spanned subtidal to intertidal sediments.  相似文献   

Magmatic and hydrothermal inclusions in carbonatite of the Magnet Cove Complex,Arkansas   总被引：1，自引：0，他引：1  

Bruce E. Nesbitt  William C. Kelly 《Contributions to Mineralogy and Petrology》1977,63(3):271-294

The carbonatite at Magnet Cove, Arkansas, USA contains a great variety and abundance of magmatic and hydrothermal inclusions that provide an informative, though fragmentary, record of the original carbonatite melt and of late hydrothermal solutions which permeated the complex in postmagmatic time. These inclusions were studied by optical and scanning electron microscopy. Primary magmatic inclusions in monticellite indicate that the original carbonatite melt contained approximately 49.7 wt% CaO, 16.7% CO₂, 15.7% SiO₂, 11.4% H₂O, 4.4% FeO+Fe₂O₃, 1.1% P₂O₅ and 1.0% MgO. The melt was richer in SiO₂ and iron oxides than the carbonatite as now exposed; this is attributed to crystal settling and relative enrichment of calcite at shallower levels. The density of the carbonatite melt as revealed by the magmatic inclusions was approximately 2.2–2.3 g/cc. Such a light melt should separate rapidly from any denser parent material and could be driven forcibly into overlying crustal rocks by buoyant forces alone. Fluid inclusions in apatite suggest that a separate (immiscible) phase composed of supercritical CO₂ fluid of low density coexisted with the carbonatite magma, but the inclusion record in this mineral is inconclusive with respect to the nature of any other coexisting fluids. Maximum total pressure during CO₂ entrapment was about 450 bars, suggesting depths of 1.5 km or less for apatite crystallization and supporting earlier proposals of a shallow, subvolcanic setting for the complex. Numerous secondary inclusions in the Magnet Cove calcite contain an intriguing variety of daughter minerals including some 19 alkali, alkaline earth and rare earth carbonates, sulfates and chlorides few of which are known as macroscopic phases in the complex. The exotic fluids from which the daughter minerals formed are inferred to have cooled and diluted through time by progressive mixing with local groundwaters. These fluids may be responsible for certain late veins and elemental enrichments associated with the complex.  相似文献   

The entropy and Gibbs free energy of formation of the aluminum ion     

Bruce S. Hemingway  Richard A. Robie 《Geochimica et cosmochimica acta》1977,41(9):1402-1404

A reevaluation of the entropy and Gibbs free energy of formation of Al³⁺_(aq) yields ?308 ± 15 J/K·mol and 489.4 ± 1.4kj/mol for S⁰₂₉₈ and $\text{ΔG}{}^0{}_{\mathrm{?,298}}$ respectively. The standard electrode potential for aluminum is 1.691 ± 0.005 volts.  相似文献   

Chemistry in the environment: Readings from Scientific American: Introductions by Carole L. Hamilton.W. E. Freeman & Co., 1973. 361 pp., $12.00 cloth; $5.95 paper     

Bruce B. Hanshaw 《Geochimica et cosmochimica acta》1974,38(5):805

  相似文献   

Reply     

Bruce Marsh 《Contributions to Mineralogy and Petrology》2015,169(2):1-9

  相似文献   

Fine‐scale diet of the Australian sea lion (Neophoca cinerea) using DNA‐based analysis of faeces          下载免费PDF全文

Kristian J. Peters  Kathy Ophelkeller  Nathan J. Bott  Bruce E. Deagle  Simon N. Jarman  Simon D. Goldsworthy 《Marine Ecology》2015,36(3):347-367

We applied DNA‐based faecal analysis to determine the diet of female Australian sea lions (n = 12) from two breeding colonies in South Australia. DNA dietary components of fish and cephalopods were amplified using the polymerase chain reaction and mitochondrial DNA primers targeting the short (~100 base pair) section of the 16S gene region. Prey diversity was determined by sequencing ~50 amplicons generated from clone libraries developed for each individual. Faecal DNA was also combined and cloned from multiple individuals at each colony and fish diversity determined. Diets varied between individuals and sites. Overall, DNA analysis identified a broad diversity of prey comprising 23 fish and five cephalopod taxa, including many species not previously described as prey of the Australian sea lion. Labridae (wrasse), Monacanthidae (leatherjackets) and Mullidae (goat fish) were important fish prey taxa. Commonly identified cephalopods were Octopodidae (octopus), Loliginidae (calamary squid) and Sepiidae (cuttlefish). Comparisons of fish prey diversity determined by pooling faecal DNA from several samples provided a reasonable but incomplete resemblance (55–71%) to the total fish diversity identified across individual diets at each site. Interpretation of diet based on the recovery of prey hard‐parts identified one cephalopod beak (Octopus sp.) and one fish otolith (Parapriacanthus elongatus). The present study highlights the value of DNA‐based analyses and their capabilities to enhance information of trophic interactions.  相似文献