Large granular lymphoma in a mule     

Zimmerman B  Jones S  Rotstein DS 《The Veterinary record》2004,155(15):462-463

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Top-down vs. bottom-up effects in kelp forests     

Foster MS  Edwards MS  Reed DC  Schiel DR  Zimmerman RC 《Science (New York, N.Y.)》2006,313(5794):1737-9; author reply 1737-9

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Sparse pre-Columbian human habitation in western Amazonia     

McMichael CH  Piperno DR  Bush MB  Silman MR  Zimmerman AR  Raczka MF  Lobato LC 《Science (New York, N.Y.)》2012,336(6087):1429-1431

Locally extensive pre-Columbian human occupation and modification occurred in the forests of the central and eastern Amazon Basin, but whether comparable impacts extend westward and into the vast terra firme (interfluvial) zones, remains unclear. We analyzed soils from 55 sites across central and western Amazonia to assess the history of human occupation. Sparse occurrences of charcoal and the lack of phytoliths from agricultural and disturbance species in the soils during pre-Columbian times indicated that human impacts on interfluvial forests were small, infrequent, and highly localized. No human artifacts or modified soils were found at any site surveyed. Riverine bluff areas also appeared less heavily occupied and disturbed than similar settings elsewhere. Our data indicate that human impacts on Amazonian forests were heterogeneous across this vast landscape.  相似文献   

Dislocation damping and anisotropic seismic wave attenuation in Earth's upper mantle     

Farla RJ  Jackson I  Fitz Gerald JD  Faul UH  Zimmerman ME 《Science (New York, N.Y.)》2012,336(6079):332-335

Crystal defects form during tectonic deformation and are reactivated by the shear stress associated with passing seismic waves. Although these defects, known as dislocations, potentially contribute to the attenuation of seismic waves in Earth's upper mantle, evidence for dislocation damping from laboratory studies has been circumstantial. We experimentally determined the shear modulus and associated strain-energy dissipation in pre-deformed synthetic olivine aggregates under high pressures and temperatures. Enhanced high-temperature background dissipation occurred in specimens pre-deformed by dislocation creep in either compression or torsion, the enhancement being greater for prior deformation in torsion. These observations suggest the possibility of anisotropic attenuation in relatively coarse-grained rocks where olivine is or was deformed at relatively high stress by dislocation creep in Earth's upper mantle.  相似文献   

Efficacy of vaccination of cattle with the Leptospira interrogans serovar hardjo type hardjoprajitno component of a pentavalent Leptospira bacterin against experimental challenge with Leptospira borgpetersenii serovar hardjo type hardjo-bovis     

Rinehart CL  Zimmerman AD  Buterbaugh RE  Jolie RA  Chase CC 《American journal of veterinary research》2012,73(5):735-740

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Demographic and environmental risk factors for infection by Theileria equi in 590 horses in Israel     

Steinman A  Zimmerman T  Klement E  Lensky IM  Berlin D  Gottlieb Y  Baneth G 《Veterinary parasitology》2012,187(3-4):558-562

The prevalence of Theileria equi infection as well as the environmental and demographic risk factors for infection was studied in 590 healthy horses from 46 farms in Israel. The prevalence of T. equi DNA was assessed using a polymerase chain reaction for a segment of the Theileria 18S rRNA gene. The overall prevalence was 26.4% (156/590). There was a significant geographical variation in the prevalence of T. equi infection, ranging from 9.3% (25/270) in the central lowlands to 81.7% (49/60) in the Golan Heights. The prevalence of T. equi infection was found to be significantly associated with management types with more horses with access to pasture being positive. Breed was identified as a risk factor for T. equi infection in a univariate analysis with relatively high infection rates in the Quarter horse and local breeds (41.1% and 36.3% respectively), while ponies and Arabian horses had a relatively low prevalence (10% and 9.1%, respectively). However, since a correlation between geographic location and breed was found, it is difficult to draw definite conclusions regarding this risk factor. Age and gender were not found as risk factors for T. equi infection in this study. The environmental variables that were significantly associated with positivity were relative humidity and minimum land surface temperature at day which both showed negative correlation with T. equi prevalence. In conclusion, Israel was found to be enzootic for T. equi infection, as indicated by the high sub-clinical infection rate, which differed between geographical areas.  相似文献   

Evaluation of shock waveform configuration on the defibrillation capacity of implantable cardioverter defibrillators in dogs     

Romain Pariaut  Carley Saelinger  Jorge Vila  William Deforge  Patricia Queiroz-Williams  Hugues Beaufrère  Michael Zimmerman  Katrin Saile  Caryn A. Reynolds 《Journal of Veterinary Cardiology》2012,14(3):389-398

BackgroundImplantable cardioverter defibrillators (ICD) are programmed to detect ventricular arrhythmias and terminate them by delivering an electrical shock. A defibrillation threshold (DFT) at least 10 J below the maximum device output is recommended for successful therapy. Shock waveform configuration is a programmable parameter used to achieve a low DFT. It is hypothesized that a fixed-pulse configuration results in lower defibrillation energy requirements than a fixed-tilt configuration.Animals10 mongrel dogs.Materials and methodsICD generator and transvenous lead were surgically implanted. Defibrillation threshold was determined using a protocol guided by the upper limit of vulnerability. Fixed-pulse and fixed-tilt (50%/50%) waveform configurations were tested in a random order. Plasma cardiac troponin I (cTnI) was measured for signs of myocardial injury.ResultsThe experiment was completed in 9 dogs. Overall mean DFT value was 424 ± 88 V (9.2 ± 3.9 J). Mean differences among voltage, energy and impedance at the DFT for fixed-pulse (422 ± 97 V, 9.1 ± 4.2 J, 62.6 ± 13.8 Ω) and fixed-tilt (426 ± 83 V, 9.3 ± 3.8 J, 62.8 ± 18.5 Ω) configurations were not statistically significant (All P > 0.21). Cardiac TnI concentration changed from 0.03 ng/mL (95% CI: 0.02–0.04) at baseline to 0.11 ng/mL (95 CI: 0.08–0.16) after DFT was obtained with the first waveform configuration and 0.19 ng/mL (95% CI: 0.13–0.28) at the end of the study period. There were no significant changes in heart rate, end-tidal CO2 and blood pressure over time (all P > 0.09).ConclusionThe tested ICD device and lead placement reliably produced acceptable DFT values, based on a 10-J safety margin below the maximum device output. A benefit of fixed-pulse configuration could not be demonstrated over the standard fixed-tilt waveform. Signs of acute myocardial damage from repeated high-voltage shocks and episodes of ventricular fibrillation seemed of limited clinical significance.  相似文献   

Blood Proteins and Inflammation in the Horse     

Mark V. Crisman  W. Kent Scarratt  Kurt L. Zimmerman 《Veterinary Clinics of North America: Equine Practice》2008

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Evaluation of transconjunctival thermal electrocautery for treatment of canine distichiasis: 88 eyelids (2013‐2016)     

Kelli L Zimmerman  Shelby L Reinstein 《Veterinary ophthalmology》2019,22(1):50-60

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Safety and efficacy of orally administered telmisartan for the treatment of systemic hypertension in cats: Results of a double‐blind,placebo‐controlled,randomized clinical trial     

Amanda E. Coleman  Scott A. Brown  Anne M. Traas  Lawrence Bryson  Tanja Zimmering  Alicia Zimmerman 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2019,33(2):478-488

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