Causes of abortion on New Zealand dairy farms with a history of abortion associated with Neospora caninum     

Weston JF  Heuer C  Parkinson TJ  Williamson NB 《New Zealand veterinary journal》2012,60(1):27-34

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Descriptive clinical and epidemiological characteristics of influenza A H1N1 2009 virus infections in pigs in England     

SM Williamson  CA Bidewell  AW Tucker  IS McCrone  JL Wood  N Brons  H Habernoll  SC Essen  IH Brown;COSI  Combating Swine Influenza  Wellcome Trust-MRC-BBSRC-Defra UK consortium 《The Veterinary record》2012,171(11):271

Infection of pigs with influenza A H1N1 2009 virus (A(H1N1)pdm09) was first detected in England in November 2009 following global spread of the virus in the human population. This paper describes clinical and epidemiological findings in the first English pig farms in which A(H1N1)pdm09 influenza virus was detected. These farms showed differences in disease presentation, spread and duration of infection. The factors likely to influence these features are described and relate to whether pigs were housed or outdoors, the age of the pigs, inter-current disease and the management system of the unit. Infection could be mild or clinically inapparent in breeding pigs with more typical respiratory disease being identified later in their progeny. Mortality was low where disease was uncomplicated by environmental stresses or concurrent infections. Where deaths occurred in pigs infected with A(H1N1)pdm09 influenza, they were mainly due to other infections, including streptococcal disease due to Streptococcus suis infection. This paper demonstrates the ease with which A(H1N1)pdm09 virus was transmitted horizontally and maintained in a pig population.  相似文献   

Cardiovascular and respiratory mechanics effects during an alveolar recruitment maneuver followed by a positive end-expiratory pressure (PEEP) titration in dogs anesthetized with isoflurane     

J. Soares  N. Pavlisko  N. Henao-Guerrero  A. Williamson  A. Giannella-Neto  A. Carvalho 《Veterinary anaesthesia and analgesia》2017,44(5):1262.e16

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Transplacental Transfer of Iron in the Water Buffalo (Bubalus bubalis): Uteroferrin and Erythrophagocytosis     

FTV Pereira  FC Braga  KC Burioli  JR Kfoury Jr  LJ Oliveira  PC Papa  AF Carvalho  CE Ambrósio  FW Bazer  MA Miglino 《Reproduction in domestic animals》2010,45(5):907-914

The objectives of this investigation were to understand transplacental transport of iron by secreted uteroferrin (UF) and haemophagous areas of water buffalo placenta and clarify the role(s) of blood extravasation at the placental‐maternal interface. Placentomes and interplacentomal region of 51 placentae at various stages of gestation were fixed, processed for light and transmission electron microscopy, histochemistry and immunohistochemistry. Haemophagous areas were present in placentomes collected between 4 and 10 months of pregnancy. Perl’s reaction for ferric iron was negative in placentomes, but positive in endometrial glands. Positive staining for UF indicated areas in which it was being taken up by phagocytosis and/or fluid phase pinocytosis in areolae of the interplacentomal mesenchyme, with little staining in endometrial stroma. Imunohistochemistry detected UF in trophectoderm of haemophagous regions of placentomes and in other parts of the foetal villous tree, but the strongest immunostaining was in the epithelial cells and lumen of uterine glands. Ultrastructural analyses indicated that erythrophagocytosis was occurring and that erythrocytes were present inside cells of the chorion that also contained endocytic vesicles and caveolae. Results of this study indicate that both the haemophagous areas of placentomes and the areolae at the interface between chorion and endometrial glands are important sites for iron transfer from mother to foetal‐placental tissues in buffalo throughout pregnancy.  相似文献   

The change in biotic and abiotic soil components influenced by paddy soil microbial fuel cells loaded with various resistances     

Gustave  Williamson  Yuan  Zhao-Feng  Sekar  Raju  Ren  Yu-Xiang  Chang  Hu-Cheng  Liu  Jinjing-Yuan  Chen  Zheng 《Journal of Soils and Sediments》2019,19(1):106-115

Journal of Soils and Sediments - Soil microbial fuel cells (sMFC) are novel technique that uses organic matters in soils as an alternative energy source. External resistance (ER) is a key factor...  相似文献   

Solution properties of single-walled carbon nanotubes   总被引：3，自引：0，他引：3  

J Chen  MA Hamon  H Hu  Y Chen  AM Rao  PC Eklund  RC Haddon 《Science (New York, N.Y.)》1998,282(5386):95-98

Naked metallic and semiconducting single-walled carbon nanotubes (SWNTs) were dissolved in organic solutions by derivatization with thionychloride and octadecylamine. Both ionic (charge transfer) and covalent solution-phase chemistry with concomitant modulation of the SWNT band structure were demonstrated. Solution-phase near-infrared spectroscopy was used to study the effects of chemical modifications on the band gaps of the SWNTs. Reaction of soluble SWNTs with dichlorocarbene led to functionalization of the nanotube walls.  相似文献   

The use of a single complement fixation test technique in bovine brucellosis, Johne's disease, dourine, equine piroplasmosis and Q fever serology   总被引：2，自引：0，他引：2  

S Herr  H F Huchzermeyer  L A Te Brugge  C C Williamson  J A Roos  G J Schiele 《The Onderstepoort journal of veterinary research》1985,52(4):279-282

The same techniques may be used in the complement fixation test (CFT) for the serological diagnosis of bovine brucellosis, Johne's disease (paratuberculosis), dourine, equine piroplasmosis and Q fever (caused by Coxiella burnetii). The reproducibility of results is excellent, falling for the most part within the twofold range and never exceeding the fourfold range. Agreement with other laboratories is excellent (i.e. within twofold) in the case of brucellosis and equine piroplasmosis antibody titres. A good correlation between the occurrence of the disease and serological reactions is found on circumstantial evidence in the cases of dourine, Johne's disease and Q fever. A standard unitage system is used to report the antibody titres found in all the tests. To simplify laboratory protocols, laboratories required to employ the CFT for the diagnosis of these diseases are advised to use a single proven technique in all the tests. Problems experienced with transient false-positive Johne's disease antibody titres in cattle following on tuberculin (bovine and avian) testing make it advisable to take specimens for the Johne's disease test prior to performing the tuberculin tests.  相似文献   

Archeoastronomy at pueblo bonito     

Williamson RA 《Science (New York, N.Y.)》1977,197(4304):619-620

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Isocupressic acid, an abortifacient component of Cupressus macrocarpa     

Parton K  Gardner D  Williamson NB 《New Zealand veterinary journal》1996,44(3):109-111

Anecdotal reports suggest that abortion occurs in New Zealand cattle after ingestion of macrocarpa (Cupressus macrocarpa). The clinical signs observed are similar to those seen in abortions caused by ponderosa pine (Pinus ponderosa Laws). Isocupressic acid has been identified as an abortifacient component of the needles of ponderosa pine. Macrocarpa collected from the Palmerston North area contained 0.89% and 1.24% isocupressic acid, compared to 1.70% isocupressic acid in Ponderosa pine needles from Oregon in the United States as analysed by the USDA-ARS Poisonous Plant Research Laboratory. These findings support observations that macrocarpa causes abortion in late gestation cattle in New Zealand and suggest the causal agent is probably isocupressic acid.  相似文献   

THE USE OF DECISION ANALYSIS TO EVALUATE THE ECONOMIC EFFECTS OF HEAT MOUNT DETECTORS IN TWO DAIRY HERDS     

N. B. Williamson B.V.Sc. 《Australian veterinary journal》1975,51(3):114-121

This paper reports a decrease in the interval from calving to conception in two commercial dairy herds, associated with the use of KaMaR Heat Mount Detectors. An economic analysis of the results uses a neoclassical decision theory approach to demonstrate that the use of heat mount detectors is likely to be profitable, with an expected net return of $154.18 per 100 calvings. The analysis demonstrates the suitability of a decision-theoretic approach to the analysis of applied research, and illustrates some of the weaknesses of "Classical" statistical analysis in such circumstances.  相似文献