A "Schrodinger Cat" Superposition State of an Atom   总被引：1，自引：0，他引：1  

C Monroe  DM Meekhof  BE King  DJ Wineland 《Science (New York, N.Y.)》1996,272(5265):1131-1136

A "Schrodinger cat"-like state of matter was generated at the single atom level. A trapped 9Be+ ion was laser-cooled to the zero-point energy and then prepared in a superposition of spatially separated coherent harmonic oscillator states. This state was created by application of a sequence of laser pulses, which entangles internal (electronic) and external (motional) states of the ion. The Schrodinger cat superposition was verified by detection of the quantum mechanical interference between the localized wave packets. This mesoscopic system may provide insight into the fuzzy boundary between the classical and quantum worlds by allowing controlled studies of quantum measurement and quantum decoherence.  相似文献   

Enhanced diapycnal mixing by salt fingers in the thermocline of the tropical Atlantic   总被引：1，自引：0，他引：1  

Schmitt RW  Ledwell JR  Montgomery ET  Polzin KL  Toole JM 《Science (New York, N.Y.)》2005,308(5722):685-688

Diapycnal mixing plays a significant role in the ocean's circulation and uptake of heat and carbon dioxide, but has not been quantified in salt finger-driven thermohaline staircases. We recently performed a tracer release experiment in the western tropical Atlantic staircase at approximately 400 m depth. The observed dispersion implies an effective diapycnal diffusivity for tracer and salt of 0.8 to 0.9 x 10(-4) m2/s. Temperature microstructure data interpreted in terms of a vertical production-dissipation balance yields a smaller effective diffusivity for heat of 0.45 (+/- 0.2) x 10(-4) m2/s, consistent with salt fingers and well above the mixing ascribable to mechanical turbulence.  相似文献   

Investigation of Johne's disease in Tasmanian fallow deer (Dama dama)     

RB Jackson  DJ Kennedy  ESG Sergeant 《Australian veterinary journal》2021,99(1-2):44-45

In 2012 when many sheep flocks in northern‐central Tasmania were experiencing a high prevalence of ovine Johne's disease, 34 wild adult fallow deer shot on or near infected properties were negative to microscopic Mptb lesions of the ileo‐caecal valve, terminal ileum and ileo‐caecal lymph nodes. This study demonstrated 95% confidence of detecting Johne's disease in this fallow deer population if ≥10% of animals were shedding Mycobacterium avium subsp. paratuberculosis in their faeces, or if ≥21% of animals were sub‐clinically infected.  相似文献   

Retrospective analysis of 736 cases of canine gastric dilatation volvulus     

KK Song  SE Goldsmid  J Lee  DJ Simpson 《Australian veterinary journal》2020,98(6):232-238

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Echinococcus granulosus in the Northern Territory,Australia: hydatid disease reported in beef cattle from the region     

CS Wilson  VJ Brookes  DJ Jenkins 《Australian veterinary journal》2020,98(3):100-102

Hydatid disease in beef cattle has been reported to be widespread throughout Australia, but cattle bred and raised in the Northern Territory were previously believed to be free of the disease. Between 2010 and 2016, 1061 cattle from the Northern Territory were slaughtered at a New South Wales abattoir and inspected for hydatid disease. The proportion of cattle reported infected with hydatid disease was 3.5%. Individual cattle identification numbers indicated that the cattle included in the study had most likely remained within the Northern Territory from birth until immediately prior to slaughter, so were assumed to have become infected within the region. We suspect that the sylvatic cycle of Echinococcus granulosus transmission could be responsible for infection of cattle in this region.  相似文献   

Chronic Kidney Disease in Small Animals     

David J. Polzin 《Veterinary Clinics of North America: Small Animal Practice》2011,41(1):15-30

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Risk factors associated with the occurrence of swine dysentery in Western Australia: results of a postal survey     

ID ROBERTSON  JRL MHOMA  DJ HAMPSON 《Australian veterinary journal》1992,69(4):92-93

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Resistance of Fasciola hepatica to triclabendazole   总被引：1，自引：0，他引：1  

DJ OVEREND  FL BOWEN 《Australian veterinary journal》1995,72(7):275-276

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Preulcerative changes to the pars oesophagea associated with Torulopsis glabrata infection in a weaned pig     

DJ. McGILLIVERY 《Australian veterinary journal》1989,66(10):337-338

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The characteristics and causes of sheep losses in the Victorian Mallee     

DJ HARRIS  G. NOWARA† 《Australian veterinary journal》1995,72(9):331-340

SUMMARY The extent and causes of sheep losses in the semi-arid Mallee region of north-western Victoria were assessed by interviewing the owners of 79 randomly selected farms running 241 flocks in 1987/88 and 245 flocks in 1988/89. Mean annual losses were higher in ram flocks (21%) than in ewe flocks (7%), in flocks of non-Merino sheep (rams 24%, ewes 11%, weaners 5%) than in Merino (rams 11%, ewes 6%, wethers 4%, weaners 4%) and in ewe flocks 3 or more years old (10%) than in young ewe flocks (3.5%). In flocks where losses exceeded 5%, the causes most often reported by farmers were blowfly strike (especially in Merino sheep and weaners), ewe losses in autumn close to lambing, and heliotrope (Heliotropium europaeum) poisoning. Heliotrope poisoning was considered by the authors to be the main reason for the higher losses in old ewes than in young ewes and in non-Merino sheep than in Merino sheep. Losses of ewes associated with pregnancy and lambing were considered by the authors to be often predisposed by liver damage caused by heliotrope poisoning, and high losses in non-Merino ram flocks were attributed to both heliotrope poisoning and their ability to escape through boundary fences. Reasons for continuing high losses due to enterotoxaemia are discussed. Losses due to gastro-intestinal parasites, footrot and foot abscess were low.  相似文献