Neurological diseases of ruminant livestock in Australia. III: bacterial and protozoal infections     

AE Kessell  JW Finnie  PA Windsor 《Australian veterinary journal》2011,89(8):289-296

Bacteria (including chlamydia) and protozoa can produce neurological disease in Australian ruminant livestock and the nature of the inflammatory and neuroparenchymal response is often suggestive of a particular aetiological agent. An overview of the clinicopathological features of infectious disease affecting the central nervous system (CNS) is followed by a discussion of important bacterial and protozoal infections in Australia. Each infectious disease is discussed in terms of classification and pathogenesis linked to clinical signs and gross and microscopic findings. The literature review is restricted to infectious conditions causing CNS disease in Australia. Sources include the Australian Veterinary Journal (over 50 years of articles), the quarterly newsletter of the National Animal Health Surveillance System and the Animal Health Surveillance Quarterly.  相似文献   

A comparison of detection methods for infectious haematopoietic necrosis virus   总被引：1，自引：0，他引：1  

Y. L. HSU  J. C. LEONG 《Journal of fish diseases》1985,8(1):1-12

Abstract. A comparative study of immunological methods for detecting infectious haematopoietic necrosis virus (IHNV) was made. The anti–IHNV antibody titre was measured by solid phase direct binding assays with'¹²⁵iodinated Protein A from Staphylococcus aureus and with immunoperoxidase staining. The binding antibody titre was much higher than that obtained in the virus neutralization assay. The high binding antibody titre of rabbit anti–IHNV sera made the development of two immunological tests for IHNV possible. Virus–specific proteins were detected on nitrocellulose membranes after transfer from denaturing polyacrylamide gels. The immunological methods were highly specific, sensitive lo less than 10 ng of virus protein, and were useful in characterizing the different strains of IHNV.  相似文献   

Clinical review of two fatal equine cases of infection with the insectivorous bat strain of Australian bat lyssavirus     

EJ Annand  PA Reid 《Australian veterinary journal》2014,92(9):324-332

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土壤电化学特牲的研究——Ⅰ.水稻土的电导与其肥力的关系     

于天仁  何羣  蒋柏藩  宣家祥  谢建昌 《土壤学报》1959,7(Z2):145-158

1.设计了一个在田间直接测定水稻土的电导的电导池,用以鉴别水稻土的肥力状况。根据条件试验,在水稻生长期间通常变动的水分含量范围以内,水分含量的差别可以不予考虑。土壤胶体本身的电荷在电导上的贡献也很小,所以一般也不必考虑。土壤含砂粒较多时,应该加以适当的改正值。2.根据大量的田间测定结果,在酸性的水稻土中,电导与肥力水平成明显相关。施肥的数量和种类对土壤电导发生显著的影响。由于水稻对养分的吸收,所以根际土壤的电导较根外为低,并且随着水稻的生长,而使土壤电导降低。3.酸性水稻土的干土渍水后电导的增加数值与土壤的肥力水平成正相关。这种电导的增加,基本上是由于有机质的分解所致。4.根据与化学分析的对照结果,土壤溶液的电导与阳离子的浓度成明显相关。在引起酸性水稻土电导的阳离子中,钙镁占90—95%,钾占2—8%,铁和铵的数量都在1%以下。5.作者根据研究结果,认为电导可以作为鉴别酸性水稻土的肥力水平的一个简便的综合性参考指标。  相似文献   

Circannual variation in plasma adrenocorticotropic hormone concentrations and dexamethasone suppression test results in Standardbred horses,Andalusian horses and mixed-breed ponies     

NJ Bamford  PA Harris  SR Bailey 《Australian veterinary journal》2020,98(12):616-621

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Preliminary investigation of the effect of treating sheep during pregnancy with a vitamin A,D, E formulation on the incidence of vaginal prolapse     

BS Allott  AG Kenyon  PA Elder 《New Zealand veterinary journal》2020,68(3):193-197

ABSTRACT

Aim: To determine if vitamin D₃ treatment reduced the incidence of vaginal prolapse in pregnant sheep on a North Canterbury sheep breeding property.

Methods: Pregnant ewes from a single farm were allocated to three treatment groups in May 2018. At this time, the first group (EarlyVitADE; n?=?512) received an I/M 1?mL dose of 500,000?IU/mL vitamin D₃, 60,000?IU/mL vitamin A, and 25?mg/mL vitamin E. This was repeated in July 2018, when the second group (LateVitADE; n?=?695) also received the same treatment. The third group (n?=?737) were untreated controls. All cases of vaginal prolapse on the property were recorded from pregnancy diagnosis in June 2018 until ewes were set-stocked in August 2018. The planned start of lambing was 10 August 2018.

Results: During the period of observation, vaginal prolapses were recorded in 3/699 (0.4%) 2-year-old ewes, and the odds of vaginal prolapse were not associated with treatment group in these ewes (p?>?0.3). Amongst ewes aged ≥3 years, during the same period, there were 6/333 (1.8%), 6/443 (1.4%) and 25/469 (5.3%) cases in the EarlyVitADE, LateVitADE and control groups, respectively. Compared to control ewes, the odds of vaginal prolapse were reduced in both the EarlyVitADE (OR?=?0.37; 95% CI?=?0.15–0.92) and LateVitADE (OR?=?0.25; 95% CI?=?0.10–0.62) treatment groups.

Conclusions and clinical relevance: In this preliminary study, administration of injectable vitamins A, D₃, and E to pregnant ewes reduced the incidence of vaginal prolapse during the period from pregnancy diagnosis to set-stocking on one North Canterbury hill-country farm. Due to the restricted data collection period, this investigation should be replicated to better quantify the repeatability of the observed treatment effect over the complete lambing period.  相似文献   

红壤微生物学特性(一)浙江省衢县低丘红壤的微生物学分析     

钱澤澍  何福恒  冯孝善  刘素云  陈本楚 《土壤学报》1964,12(4):390-400

浙江省的低丘红壤主要有两种类型,一种是以第四纪初期洪积体-红土层为母质,经长期的自然生物气候条件作用发育而成的红-黄色土壤,农民称为“黄筋泥”。黄筋泥土层深厚,质地一般属粉砂质粘土,呈强酸性反应。另一种是以衢江红砂岩的风化体为母质发育而成的土壤,称为红砂土。第三纪衢江红砂岩地层处在第四纪红土层之下,因此只有在红土层受到侵触,红砂岩暴露出来的地方,红砂土才能形成。在低丘红壤区里,黄筋泥和红砂土交错地分布着,构成复区。  相似文献   

中国土壤中粘粒矿物的分布规律   总被引：2，自引：0，他引：2  

熊毅  许冀泉 《土壤学报》1964,12(3):266-274

土壤粘粒部分的组成和性质在土壤发生学及土壤肥力特性的研究中都占很重要的位置。过去认为土壤粘粒中的无机物都是非晶形的,自从伦琴射线衍射应用到土壤学研究中后,大家都公认土壤粘粒部分含有晶形结构的矿物。  相似文献   

NUCLEATION,POLYMERIZATION, AND PRECIPITATION OF FeOOH1     

PA HO HSU 《European Journal of Soil Science》1972,23(4):409-419

Fresh Fe(ClO₄)₃ solutions, 0.01 M or 0.001 M in iron (III), were seeded with iron (III) hydroxide brown sols and the reaction processes were investigated. In two experiments, HC1O₄ was added to fresh Fe(ClO₄)₃ solutions to lower their degrees of super saturation with respect to iron (III) hydroxide. Depending upon the quantity of seeding solution added, it was found that samples differed greatly in appearance and in the stability during ageing. With a small amount of seeding solution added and following a relatively long induction period, the sample rapidly developed to a dense, cloudy yellow suspension with FeOOH precipitate settled shortly afterwards. With an increased amount of seeding solution added, the sample gradually became more brownish and less turbid and eventually a clear brown sol was observed. Although α-FeOOH was the major hydrolysed species in all samples, a yellow precipitate which settled under gravity was found only in those containing a small quantity of seeding solution. The above results provide experimental evidence supporting the hypothesis (Hsu and Ragone, 1972) that the initial number of nuclei relative to the concentration of mono-meric species is the key factor governing the appearance and the stability of an hydrolysed iron (III) solution. In another experiment, varying amounts of a seeding solution were added to a fresh, pure 0.001 M Fe(ClO₄)₃ solution to which no HC1O₄ was added. All samples rapidly hydrolysed to clear brown sols in less than 6 hours and no noticeable seeding effect was observed. It is suggested that a pure 0.001 M Fe(ClO₄)₃ solution is highly supersaturated with respect to iron (III) hydroxide and a large number of nuclei spontaneously form in situ shortly after preparation.  相似文献   

关于旅大地区小麦秆锈菌和叶锈菌夏孢子世代的越冬问题     

曾广然  何健三  張国淳  周声学  薛立信 《植物病理学报》1957,3(1):87-97

 关于小麦秆锈和叶锈的越冬问题,国外业巳有许多报告^{[10,13,14,15,16,17,18]}。国内在小麦锈菌越冬方面也有一些报导。  相似文献