Cross‐sectional survey of health management and prevalence of vector‐borne diseases,endoparasites and ectoparasites in Samoan dogs          下载免费PDF全文

RJ Carslake  KE Hill  K Sjölander  SF Hii  D Prattley  E Acke 《Australian veterinary journal》2017,95(12):462-468

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Epizootics of sudden death in tammar wallabies (Macropus eugenii) associated with an orbivirus infection     

KA Rose  PD Kirkland  RJ Davis  D Blumstein  LI Pritchard  KM Newberry  RA Lunt 《Australian veterinary journal》2012,90(12)

Epizootics of sudden death in tammar wallabies (Macropus eugenii) occurred at six research facilities and zoological gardens in New South Wales, Australia, in late 1998 and at one Queensland research facility in March 1999. There were 120 confirmed tammar wallaby deaths during this period; however, population censuses indicated that up to 230 tammar wallabies may have died. The majority of animals died without premonitory signs. A small proportion of wallabies exhibited increased respiratory rate, sat with a lowered head shortly before death or were discovered in lateral recumbency, moribund and with muscle fasciculations. Gross postmortem findings consistently included massive pulmonary congestion, mottled hepatic parenchyma and subcutaneous oedema throughout the hindlimbs and inguinal region. Approximately 30% of the animals examined also had extensive haemorrhage within the fascial planes and skeletal muscle of the hindlimb adductors, inguinal region, ventral thorax, dorsal cervical region and perirenal retroperitoneal area. The tissues of affected animals became autolytic within a short period after death. Bacteriological examination of tissues from 14 animals did not provide any significant findings. Toxicological examination of the gastric and colonic contents of four animals did not reveal evidence of brodifacoume or other rodenticides. Viruses from the Eubenangee serogroup of the Orbivirus genus were isolated from the cerebral cortex of nine, and the myocardium of two, tammar wallabies and the liver and intestine of another tammar wallaby. A similar orbivirus was also isolated from the cerebrospinal fluid of another tammar wallaby that died suddenly. The disease agent appears to be a previously unrecognised orbivirus in the Eubenangee serogroup. This is the first report of epizootics of sudden deaths in tammar wallabies apparently associated with an orbivirus infection.  相似文献   

Improved insect‐proofing: expressing double‐stranded RNA in chloroplasts          下载免费PDF全文

Julia Bally  Elane Fishilevich  Andrew J Bowling  Heather E Pence  Kenneth E Narva  Peter M Waterhouse 《Pest management science》2018,74(8):1751-1758

RNA interference (RNAi) was discovered almost 20 years ago and has been exploited worldwide to silence genes in plants and animals. A decade later, it was found that transforming plants with an RNAi construct targeting an insect gene could protect the plant against feeding by that insect. Production of double‐stranded RNA (dsRNA) in a plant to affect the viability of a herbivorous animal is termed trans‐kingdom RNAi (TK‐RNAi). Since this pioneering work, there have been many further examples of successful TK‐RNAi, but also reports of failed attempts and unrepeatable experiments. Recently, three laboratories have shown that producing dsRNA in a plant's chloroplast, rather than in its cellular cytoplasm, is a very effective way of delivering TK‐RNAi. Our review examines this potentially game‐changing approach and compares it with other transgenic insect‐proofing schemes. © 2018 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.  相似文献   

A technique for the photography of surface morphology of bacterial colonies     

RJ CAMPBELL 《Australian veterinary journal》1989,66(9):303-304

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Some characteristics of a recent virulent isolate of Marek's disease virus   总被引：1，自引：0，他引：1  

M ZERBES  GA TANNOCK  RJ JENNER  PL YOUNG 《Australian veterinary journal》1994,71(1):21-22

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Earthquakes on dipping faults: the effects of broken symmetry   总被引：3，自引：0，他引：3  

DD Oglesby  RJ Archuleta  SB Nielsen 《Science (New York, N.Y.)》1998,280(5366):1055-1059

Dynamic simulations of earthquakes on dipping faults show asymmetric near-source ground motion caused by the asymmetric geometry of such faults. The ground motion from a thrust or reverse fault is larger than that of a normal fault by a factor of 2 or more, given identical initial stress magnitudes. The motion of the hanging wall is larger than that of the footwall in both thrust (reverse) and normal earthquakes. The asymmetry between normal and thrust (reverse) faults results from time-dependent normal stress caused by the interaction of the earthquake-generated stress field with Earth's free surface. The asymmetry between hanging wall and footwall results from the asymmetric mass and geometry on the two sides of the fault.  相似文献   

Duration of serological response to canine parvovirus‐type 2, canine distemper virus,canine adenovirus type 1 and canine parainfluenza virus in client‐owned dogs in Australia     

SA Mitchell  RJ Zwijnenberg  J Huang  A Hodge  MJ Day 《Australian veterinary journal》2012,90(12):468-473

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A Magnetic Signature at Io: Initial Report from the Galileo Magnetometer   总被引：1，自引：0，他引：1  

MG Kivelson  KK Khurana  RJ Walker  CT Russell  JA Linker  DJ Southwood  C Polanskey 《Science (New York, N.Y.)》1996,273(5273):337-340

During the inbound pass of the Galileo spacecraft, the magnetometer acquired 1 minute averaged measurements of the magnetic field along the trajectory as the spacecraft flew by Io. A field decrease, of nearly 40 percent of the background jovian field at closest approach to Io, was recorded. Plasma sources alone appear incapable of generating perturbations as large as those observed and an induced source for the observed moment implies an amount of free iron in the mantle much greater than expected. On the other hand, an intrinsic magnetic field of amplitude consistent with dynamo action at Io would explain the observations. It seems plausible that Io, like Earth and Mercury, is a magnetized solid planet.  相似文献   

Multivariable dependence of Fe-Mg partitioning in the lower mantle     

H Mao  G Shen  RJ Hemley 《Science (New York, N.Y.)》1997,278(5346):2098-2100

High-pressure diamond-cell experiments indicate that the iron-magnesium partitioning between (Fe,Mg)SiO3-perovskite and magnesiowustite in Earth's lower mantle depends on the pressure, temperature, bulk iron/magnesium ratio, and ferric iron content. The perovskite stability field expands with increasing pressure and temperature. The ferric iron component preferentially dissolves in perovskite and raises the apparent total iron content but had little effect on the partitioning of the ferrous iron. The ferrous iron depletes in perovskite at the top of the lower mantle and gradually increases at greater depth. These changes in iron-magnesium composition should affect geochemical and geophysical properties of the deep interior.  相似文献   

Direct Radiative Forcing by Smoke from Biomass Burning     

PV Hobbs  JS Reid  RA Kotchenruther  RJ Ferek  R Weiss 《Science (New York, N.Y.)》1997,275(5307):1776-1778

Airborne measurements in smoke from biomass burning in Brazil have yielded optical parameters that permit an improved assessment of the effects of smoke on Earth's radiation balance. The global-mean direct radiative forcing due to smoke from biomass burning worldwide is estimated to be no more than about -0.3 watt per square meter (cooling), compared with +2.45 watts per square meter (warming) due to anthropogenic greenhouse gases. On regional scales, direct radiative forcing due to smoke can be large and might indirectly affect global climate.  相似文献