Clinical, haematological and biochemical findings in foals with neonatal Equine herpesvirus-1 infection compared with septic and premature foals.     

G Perkins  D M Ainsworth  H N Erb  F Del Piero  M Miller  P A Wilkins  J Palmer  M Frazer 《Equine veterinary journal》1999,31(5):422-426

A retrospective multicentre study comparing historical, clinical, haematological, acid-base and biochemical findings of foals with Equine herpesvirus-1 (EHV-1) infection, septicaemia or prematurity was performed to determine if early diagnosis of EHV-1 foals was possible. Fifty-three foals were studied and were assigned to one of 2 groups: herpes positive (n = 14) or herpes negative (n = 39). The latter group included 20 septic, 11 premature, and 8 premature and septic foals. The presence of herpes antigen was confirmed by immunoperoxidase histochemical staining of tissues from necropsied foals. A nonparametric statistical analysis followed by a backwards elimination logistic regression was performed to establish a model at a P value of <0.05. All herpes positive foals died, while 47% (9/19) of the septic foals survived. Based upon our analysis, herpes positive foals were more likely to have total white blood cell counts less than 3 x 10(9)/l and to be icteric as compared to the septic and premature foals. Despite profound hepatic necrosis in the herpes positive foals, liver enzymes were not elevated and were not significantly different from the controls.  相似文献   

Colossal Magnetoresistance Without Mn3+/Mn4+ Double Exchange in the Stoichiometric Pyrochlore Tl2Mn2O7     

MA Subramanian  BH Toby  AP Ramirez  WJ Marshall  AW Sleight  GH Kwei 《Science (New York, N.Y.)》1996,273(5271):81-84

Structural analysis from powder neutron and single-crystal x-ray diffraction data for a sample of the Tl2Mn2O7 pyrochlore, which exhibits colossal magnetoresistance (CMR), shows no deviations from ideal stoichiometry. This analysis gives an Mn-O distance of 1.90 angstroms, which is significantly shorter than the Mn-O distances (1.94 to 2.00 angstroms) observed in phases based on LaMnO3 perovskites that exhibit CMR. Both results in Tl2Mn2O7 indicate oxidation states very close to Tl23+Mn24+O7. Thus, Tl2Mn2O7 has neither mixed valence for a double-exchange magnetic interaction nor a Jahn-Teller cation such as Mn3+, both of which were thought to have an important function in CMR materials. An alternate mechanism for CMR in Tl2Mn2O7 based on magnetic ordering driven by superexchange and strong spin-fluctuation scattering above the Curie temperature is proposed here.  相似文献   

Rapid determination of the critical temperature in simulated annealing inversion   总被引：2，自引：0，他引：2  

Basu A  Frazer LN 《Science (New York, N.Y.)》1990,249(4975):1409-1412

Knowledge of the critical temperature, T(*), the temperature at which a phase change occurs, greatly improves the efficiency of simulated annealing when used for optimization or inversion. A numerical method of accurately determining T(*) in a relatively short computation time has been developed. This method is used to recover the seismic soundspeed profile from wavefield data, a problem in which cycle skipping causes many local minima of the energy function and the averaging of the medium by finite length waves results in many states with similar energies. Computations indicate that it is cost-effective to spend about 80 percent of the computing budget looking for T(*) instead of annealing, and that in the course of finding T(*) many states with energies near the global minimum will also be found. The a posteriori probability distribution of the solution has been constructed from trial solutions generated at T(*).  相似文献   

EFFECT OF COPPER SMELTING AIR POLLUTION ON THE MITES (ACARI) ASSOCIATED WITH YOUNG SCOTS PINE FORESTS POLLUTED BY A COPPER SMELTING WORKS AT GŁOGÓW,POLAND. II. SOIL MITES     

SENICZAK  STANISŁAW  KLIMEK  ANDRZEJ  GACKOWSKI  GRZEGORZ  KACZMAREK  SŁAWOMIR  ZALEWSKI  WOJCIECH 《Water, air, and soil pollution》1997,97(3-4):287-302

Water, Air, &; Soil Pollution - The soil mites were investigated in the areas covered with dead needles in young Scots pine forests (plant association Leucobryo-Pinetum), polluted by a copper...  相似文献   

Veterinarians and the conservation of biodiversity     

AW ENGLISH 《Australian veterinary journal》1997,75(8):567-567

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Histopathologic effects of dimethyl sulfoxide on equine endometrium     

G S Frazer  T J Rossol  W R Threlfall  S E Weisbrode 《American journal of veterinary research》1988,49(10):1774-1781

Endometrial fibrosis is a major cause of infertility in broodmares. Because of the proven anti-inflammatory effects of dimethyl sulfoxide (DMSO) and its influence on collagen, the effect of DMSO on the endometrium was investigated in mares. Solutions of DMSO (25%, 50%, or 75%) were infused into the uterus of clinically normal mares. Examination of serially obtained biopsy specimens revealed epithelial ulceration and stromal inflammation that were proportional to the DMSO concentration infused, but vasodilatation was not observed. In all mares, the endometrium had returned to normal by day 21 after DMSO infusion.  相似文献   

Gastrointestinal helminthosis in fallow deer (Dama dama) and their response to treatment with anthelmintics     

GE MYLREA  RC MULLEY  AW ENGLISH 《Australian veterinary journal》1991,68(2):74-75

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Past temperatures directly from the greenland ice sheet   总被引：3，自引：0，他引：3  

D Dahl-Jensen  K Mosegaard  N Gundestrup  GD Clow  SJ Johnsen  AW Hansen  N Balling 《Science (New York, N.Y.)》1998,282(5387):268-271

A Monte Carlo inverse method has been used on the temperature profiles measured down through the Greenland Ice Core Project (GRIP) borehole, at the summit of the Greenland Ice Sheet, and the Dye 3 borehole 865 kilometers farther south. The result is a 50, 000-year-long temperature history at GRIP and a 7000-year history at Dye 3. The Last Glacial Maximum, the Climatic Optimum, the Medieval Warmth, the Little Ice Age, and a warm period at 1930 A.D. are resolved from the GRIP reconstruction with the amplitudes -23 kelvin, +2.5 kelvin, +1 kelvin, -1 kelvin, and +0.5 kelvin, respectively. The Dye 3 temperature is similar to the GRIP history but has an amplitude 1.5 times larger, indicating higher climatic variability there. The calculated terrestrial heat flow density from the GRIP inversion is 51.3 milliwatts per square meter.  相似文献   

International geological congress at Berlin     

Frazer P 《Science (New York, N.Y.)》1885,6(150):540-541

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The relations of the International geological congress to geological workers     

Frazer P 《Science (New York, N.Y.)》1887,9(222):439-440

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