Hepatic lipidosis and other test findings in two captive adult porcupines (Erethizon dorsatum) dying from a "sudden death syndrome".     

Robert Barigye  Ev Schamber  Teresa K Newell  Neil W Dyer 《Journal of veterinary diagnostic investigation》2007,19(6):712-716

Routine postmortem examination and histologic evaluation of tissue sections demonstrated hepatic lipidosis (HL) in 2 adult captive porcupines with a history of sudden death. The male porcupine had a markedly enlarged pale liver that microscopically showed large unilocular vacuoles within hepatocellular cytoplasm. The periparturient female had similar but less marked hepatic lesions and an incidental pulmonary mycosis. These findings suggest HL as an important differential of spontaneous death in captive porcupines. It is hypothesized that in addition to the widely documented causes, HL in captive porcupines may be specifically associated with nutritional imbalances caused by the feeding of unsuitable commercial diets. The possible association of the condition with dietary and other factors in captive porcupines needs to be thoroughly investigated.  相似文献   

Marine Planation of Tropical Limestone Islands     

Newell ND 《Science (New York, N.Y.)》1960,132(3420):144-145

Geological studies in the western Atlantic indicate that sea level is now near its highest position since the Pleistocene, and that intertidal erosion at this level has been negligible. The evidence conflicts with the idea that many coral reefs were recently planed down from a higher stand of the sea.  相似文献   

Space Science: The future holds exciting possibilities for scientific research by man in space     

Newell HE 《Science (New York, N.Y.)》1963,139(3554):464-471

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Comparison of the radius of curvature of the ulnar trochlear notch of Rottweilers and Greyhounds     

Collins KE  Cross AR  Lewis DD  Zapata JL  Goett SD  Newell SM  Rapoff AJ 《American journal of veterinary research》2001,62(6):968-973

OBJECTIVE: To compare radius of curvature along the ulnar trochlear notch of Rottweilers and Greyhounds to determine whether morphologic differences exist that may contribute to the cause and pathogenesis of fragmented coronoid process in Rottweilers. SAMPLE POPULATION: Paired elbow joints from 13 Rottweilers and 14 Greyhounds. PROCEDURE: Elbow joints were radiographically scored on the basis of severity of osteoarthritic lesions. The articular contour of each ulnar trochlear notch was digitized. The radius of curvature at defined points along the ulnar trochlear notch was compared between breeds. RESULTS: Radius of curvature of the ulnar trochlear notch was not a constant function of arc length in either breed but had a consistent characteristic appearance in both breeds. Radius of curvature was greatest at each end of the ulnar trochlear notch and had 2 peaks in the midportion of the notch in both breeds. These peaks occurred farther distally in the notch and were larger in Rottweiler ulnae than Greyhound ulnae. A significant difference in mean radius of curvature was detected between breeds at these peaks. Greyhounds had significantly greater mean radius of curvature at the end of the medial coronoid process, compared with Rottweilers. CONCLUSIONS AND CLINICAL RELEVANCE: Radius of curvature of the ulnar trochlear notch is a complex function of arc length in Rottweilers and Greyhounds. The waveform has a consistent characteristic appearance in both breeds. Although significant differences were identified between breeds, associations between these differences and cause or pathogenesis of fragmented coronoid process in Rottweilers were not apparent.  相似文献   

Theriogenology question of the month. Pyometra, hydrometra, or mucometra     

von Reitzenstein M  Archbald LF  Newell SM 《Journal of the American Veterinary Medical Association》2000,216(8):1221-1223

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LETTERS     

Nola Lester  BVMS  Greg Roberts  DVM  Susan Newell  DVM  John Graham  MVB 《Veterinary radiology & ultrasound》2000,41(4):381-387

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Inter-regional comparison of patterns and trends in surface water acidification across the United States     

Avis D. Newell 《Water, air, and soil pollution》1993,67(3-4):257-280

Temporal trends in acid-base chemistry are reported for surface waters in 6 regions of the United States. The lakes and streams are low ANC, dilute systems, selected to represent acid-sensitive aquatic resources in the 6 regions. The predominant trends observed were decreases in lake and stream SO₄ ^2? concentrations in sites east of the Mississippi River, and increases in NO₃ ^? in the Adirondack lake and Catskill stream sites (both located in eastern New York State). Correlations of trend results from all sites with other factors indicated that trends in precipitation volume were highly correlated with the observed trend patterns. From the surface water trend results, three distinct clusters were identified that corresponded to three trend patterns: ‘dilution,’ ‘recovery,’ and ‘acidification.’ These were distributed across the LTM regions, with no particular geographic patterns.  相似文献   

Acidification Trends in Surface Waters in the International Program on Acidification of Rivers and Lakes     

Newell  Avis D.  Skjelkvåle  Brit Lisa 《Water, air, and soil pollution》1997,93(1-4):27-57

We applied trend analyses to data from the International Cooperative Programme forAcidification of Rivers and Lakes in an attempt to discover regional patterns of long-term changesin surface water chemistry both in Europe and North America, and to relate these changes totrends in deposition. Decreases in surface water SO ₃ ^- concentrations predominated at European sites in theFederal Republic of Germany, The Netherlands, and in Norway, and at the North American sitesin Ontario, Canada, the Adirondacks and Catskill Mountains of New York, U.S.A. Otherpredominating trends in the European sites were decreasing Ca²⁺ concentrations at many of thesites in The Netherlands, Norway, and Sweden. Increases in NO ₃ ^- were observed at several sites in southern Norway, and in theAdirondack and Catskill regions of eastern New York. This, combined with an increasedoccurrence of declining base cation concentrations may well be responsible for the lack ofdocumented surface water recovery from acidification. Despite region-wide trends in severalvariables of importance in acidification, no correlations between surface water trends and changesin deposition were found using these data.  相似文献   

Interaction between two decomposer basidiomycetes and a collembolan under Sitka spruce: Grazing and its potential effects on fungal distribution and litter decomposition     

Kathryn Newell 《Soil biology & biochemistry》1984,16(3):235-239

The hypothesis that selective grazing by Onychiurus latus Gisin altered the outcome of competition between two basidiomycetes, Mycena galopus (Pers. ex Fr.) Kummer and Marasmius androsaceus (L. ex Fr.) Fr. on Sitka spruce litter was tested. Without grazing M. androsaceus had the higher colonizing ability of litter in the laboratory whereas with grazing the position was reversed. Field exclusion experiments also suggested that higher densities of O. latus resulted in a reduction in the activity of M. androsaceus and an increase in that of M. galopus and vice versa. It is suggested that selective grazing may be an important factor determining the field distribution of these fungi, since M. androsaceus, the preferred food source, was restricted to the L litter horizon where the density of O. latus was not high enough to alter the outcome of competition whereas M. galopus predominated in the F₁ horizon. The rate of decomposition of Sitka spruce litter in the laboratory caused by M. androsaceus (17% dry weight loss over 6 months at 11°C) increased by 4–14% in the presence of grazing by O. latus whereas that of M. galopus (11.5%) decreased by 12–16%.  相似文献   

Trace element discharges from coal combustion for power production     

David H. Klein  Anders W. Andren  Newell E. Bolton 《Water, air, and soil pollution》1975,5(1):71-77

Partition factors have been calculated to describe the distribution of 38 elements between slag, total fly ash, atmospherically emitted fly ash, and vapors for a coal fired steamplant. These factors have been generalized to other types of boilers, to calculate the annual U.S. discharge of trace elements due to coal combustion for power production. The magnitude of trace element mobilization by coal combustion is compared with industrial consumption of trace elements, and with estimates of their natural mobilization by weathering. Elemental flows due to coal consumption are never less than 1.5% of their weathering mobilization, and coal combustion introduces As, Co, Cu, Fe, Hg, Mo, Ni, Pb, Sc, Se, U, V, and Zn into the environment at rates comparable to their rates of introduction by weathering.  相似文献