Action of the fungicide phosphite on Eucalyptus marginata inoculated with Phytophthora cinnamomi   总被引：1，自引：1，他引：0  

Jackson  Burgess  Colquhoun  & Hardy 《Plant pathology》2000,49(1):147-154

Although phosphite has been effective in the control of P. cinnamomi in E. marginata (jarrah) , the biochemical mechanisms behind phosphite protection are poorly understood. Using an aeroponics system, jarrah clones with moderate resistance to P . cinnamomi were treated with foliar applications of phosphite (0 and 5 g L⁻¹). The roots were inoculated with zoospores of P. cinnamomi at 4 days before and 0, 2, 5, 8 and 14 days after phosphite treatment. Root segments were then analysed for activity of selected host defence enzymes (4-coumarate coenzyme A ligase [4-CL], cinnamyl alcohol dehydrogenase [CAD]) and the concentration of soluble phenolics and phosphite. Lesion development was most effectively reduced when phosphite concentrations within the roots were highest (i.e. days 8–14). During this time, the levels of host defence enzymes remained relatively unchanged. Lesion development was also effectively restricted when phosphite concentrations within the roots were lowest (i.e. days 2 and 5); a significant increase in host defence enzymes was associated with this decrease in lesion development. It was concluded from these studies that the effect of phosphite in controlling the pathogen is determined by the phosphite concentration at the host–pathogen interface. When phosphite concentrations within the roots are low, phosphite interacts with the pathogen at the site of ingress to stimulate host defence enzymes. At high phosphite concentrations, phosphite acts directly on the pathogen to inhibit its growth before it is able to establish an association with the host, and the host defences remain unchanged.  相似文献   

Susceptibility of cats to equine morbillivirus   总被引：7，自引：0，他引：7  

HA WESTBURY  PT HOOPER  SL BROUWER  PW SELLECK 《Australian veterinary journal》1996,74(2):132-134

Objective To assess the susceptibility of cats to equine morbillivirus (EMV) by direct administration of the virus by subcutaneous, intra-nasal or oral routes, and following exposure to infected cats.
Design A disease transmission study, with controls, using ten cats.
Procedure Groups of cats were given the virus by the designated methods and assessed for evidence of infection by clinical examination, plus pathological and virological tests.
Results All cats administered the virus by subcutaneous, intra-nasal or oral routes became infected and developed the disease within 4 to 8 days. One of two cats in contact with affected cats also developed the disease, but two cats kept near to affected cats did not become infected. The virus was isolated from a range of tissues collected from the infected cats, and the lesions observed in affected cats were similar to those previously observed in horses naturally and experimentally infected with the virus.
Conclusion This is the first demonstration that animals can be infected with EMV by non-parenteral means, that the virus can transmit naturally between animals and confirms other reports of the similarity of EMV disease in horses and cats.  相似文献   

Settling of insecticide from dip wash mixed with dam water and zinc sulphate and used to control sheep lice (Bovicola ovis)     

PW MORCOMBE  DF HIDE†  GE YOUNG  EW ARMSTRONG‡  LE MILLAR§  ARB HIGGS¶ 《Australian veterinary journal》1995,72(11):411-414

SUMMARY Insecticidal dipping fluid emulsions, mixed in vitro in dam water containing suspended clay particles and 1% w/v zinc sulphate, were analysed to determine rates of settling of diazinon, cyhalothrin and cypermethrin. Fifteen minutes after mixing, the concentration of the insecticides 5 cm below the surface had declined by 72.5%, 72.8% and 89.4%, respectively. On remixing, the concentration of insecticide in suspension was close to or greater than the initial concentration. In 2 trials, lice were eradicated from sheep showered with dip wash mixed in cloudy dam water to which 1% w/v of zinc sulphate was added. In 12 flock treatments in which 1000 to 2000 sheep were dipped with added zinc sulphate, the concentration of insecticide remained above the minimum lethal for susceptible strains of lice. However, lice were still present 6 months later in 8 of these flocks. When zinc sulphate is added to dip wash, agitation is needed to maintain the insecticide in suspension.  相似文献   

Interdigital subcutaneous emphysema ('bubble foot') in Crocodylus porosus hatchlings     

JA TURTON  PW LADDS  LF MELVILLE 《Australian veterinary journal》1996,74(5):395-397

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Epididymal aplasia in two rams     

PW LADDS  GD BRIGGS  RA FOSTER 《Australian veterinary journal》1990,67(12):457-458

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Pathological findings in the bulbourethral glands of bulls     

CM CAMPERO  PW LADDS  AD THOMAS† 《Australian veterinary journal》1988,65(8):241-244

The bulbourethral glands of 323 Bos indicus or B. indicus crossbred bulls more than 1 1/2 years old were examined in an abattoir study. Bulbourethral adenitis was diagnosed grossly and confirmed by histological examination in 4 (1.2%). Unilateral chronic interstitial inflammation was seen in 2 cases; one of these was associated with a degenerative-type seminal vesiculitis. In the others adenitis was bilateral; in one case it was associated with a concretion and foreign (plant) material in the principal duct of the left bulbourethral gland; in the other bilateral case, numerous calculi were present and microscopically, a chronic active and diffuse inflammation was observed. Chemical analysis of the calculi showed calcium oxalate and tricalcium phosphate to be the most important components. Corynebacterium spp was isolated from the lesion with multiple calculi but attempts to isolate Chlamydia spp, Mycoplasma spp and Brucella abortus from the 4 adenitis cases were unsuccessful. Congenital abnormalities such as glandular fusion (2.2%) or unilateral aplasia (0.6%) were also observed. Cysts were the most common finding (19.2%), and duct dilation was frequent (7.1%). The significance of these findings in relation to fertility is considered.  相似文献   

British Columbia. Lyme Disease in horses   总被引：1，自引：0，他引：1       下载免费PDF全文

Burgess B 《The Canadian veterinary journal. La revue veterinaire canadienne》1988,29(4):393-394

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Evaluation of the Efficacy of Disinfectant Footmats for the Reduction of Bacterial Contamination on Footwear in a Large Animal Veterinary Hospital          下载免费PDF全文

K.J. Hornig  B.A. Burgess  N.T. Saklou  V. Johnson  A. Malmlov  D.C. Van Metre  P.S. Morley  S.R. Byers 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2016,30(6):1882-1886

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Histologic and immunohistochemical characterization of thymic epithelial tumours in the dog          下载免费PDF全文

K. E. Burgess  C. J. DeRegis  F. S. Brown  J. H. Keating 《Veterinary and comparative oncology》2016,14(2):113-121

Thymic epithelial tumour (TET) histologic subclassification has not been well described in the veterinary literature as it has in humans. The objective of this study was to identify and describe TET subtypes in dogs and to determine the utility of immunohistochemistry (IHC) in differentiating these subtypes. Samples were reviewed and classified according to a modified World Health Organization (WHO) criteria for human tumours of thymic origin. Signallment, presenting signs, treatment and survival data was collected from medical records. Histologic review confirmed the same subtypes as described in humans. Presence of high stage disease, pleomorphism, mitotic figures and capsular invasion was more common in atypical thymomas and thymic carcinomas than in thymomas. IHC was performed for GLUT‐1, CD5, CD117 and CK8/18; however, this was not useful in classifying the tumours.  相似文献   

Does the response of bird assemblages to fire mosaic properties vary among spatial scales and foraging guilds?     

Emma E. Burgess  Martine Maron 《Landscape Ecology》2016,31(3):687-699

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