Differentiation between dogs with thrombosis and normal dogs using the overall hemostasis potential assay          下载免费PDF全文

Anna L. Dengate BVSc  BMedSc  Marie‐Christine Morel‐Kopp PhD  Julia A. Beatty PhD  BVetMed  BSc  Vanessa Barrs BVSc  MVetClinStud  Jody A. Braddock BVSc  MVetClinStud  Richard K. Churcher BVSc  Bethany J. Wilson BVSc  PhD  Christopher M. Ward BMedSc  MBChB  PhD 《Journal of Veterinary Emergency and Critical Care》2016,26(3):446-452

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Studies of Coxiella burnetii infections in dairy herds with special regard to infections in men     

Sting R  Kopp J  Mandl J  Seeh C  Seemann G  Kimmig P  Schmitt K  Mentrup T 《Berliner und Münchener tier?rztliche Wochenschrift》2002,115(9-10):360-365

Investigations of 1167 dairy cows out of 105 herds with fertility disorders on secretion of Coxiella burnetii (C. burnetii) by the genitals as well as serological studies of these animals using ELISA demonstrated that C. burnetii infections are significantly associated with abortions but not with repeated inseminations without success or vaginal excretions. The demonstration of an increased risk of infections for persons caring for those dairy herds could be shown by a total of 253 serological studies. A comparison of these studies of farmers caring for dairy herds suffering from abortions a seroprevalence of > or = 20% showed that these persons revealed significantly more frequent antibodies against C. burnetii than farmers of the group compared with. Further studies showed that in herds suffering from abortions a seroprevalence of > or = 20% means an additional risk of infections of farmers. Vice versa abortions of the cows in herds with a seroprevalence of > or = 20% imply an additional infectious risk.  相似文献   

Transplantation of Normal Boar Testicular Cells Resulted in Complete Focal Spermatogenesis in a Boar Affected by the Immotile Short-tail Sperm Defect     

M Mikkola  A Sironen  C Kopp  J Taponen  A Sukura  J Vilkki  T Katila  M Andersson 《Reproduction in domestic animals》2006,41(2):124-128

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Multinuclear–Multiflagellar Sperm Defect in a Bull – a New Sterilizing Sperm Defect     

C Kopp  A Sukura  E Tuunainen  I Gustavsson  M Parvinen  M Andersson 《Reproduction in domestic animals》2007,42(2):208-213

The development and use of modern techniques, such as intracytoplasmic sperm injection (ICSI), gene knockout and sperm fluorescence in situ hybridization with chromosome- specific probes, have significantly increased our knowledge about sperm defects. We describe a new oligoasthenoteratozoospermic defect in a bull. Because of its morphological characteristics the defect was named the multinuclear-multiflagellar sperm defect. All spermatozoa in the ejaculate were abnormal. Many of the spermatozoa had multiple nuclei and multiple sperm tails. All spermatozoa lacked an acrosome, and only seldom did spermatozoa have a mitochondrial helix in the midpiece area. Meiosis and spermiogenesis were severely affected in this otherwise phenotypically normal bull. The sperm defects resembled the phenotype of a targeted gene knockout Hrb(-/-) (HIV-1 Rev-binding/interacting protein) mutant mouse strain, which is expressed as sterility in males, while females remain fertile. Since the father of this bull has been extensively used in at least three countries the defective gene has possibly become widespread in the red and white breeds (Ayrshire, Swedish Red and White, Norwegian Red) in the Nordic countries. However, it is not proved that the father of this bull is a carrier of this defect.  相似文献   

Drought responses of six ornamental herbaceous perennials     

Nickolee Zollinger  Roger Kjelgren  Teresa Cerny-Koenig  Kelly Kopp  Rich Koenig 《Scientia Horticulturae》2006

Although low water use landscaping is becoming common in arid regions, little is known about drought tolerance and drought responses of many ornamental plants, especially herbaceous perennials. Drought responses were assessed for six herbaceous ornamental landscape perennials in a 38 l pot-in-pot system in northern Utah over a 2-year period. The first year was an establishment period. During the second year, drought responses were evaluated for established Echinacea purpurea (L.) Moench, Gaillardia aristata Pursh, Lavandula angustifolia P. Mill., Leucanthemum × superbum (J.W. Ingram) Berg. ex Kent, ‘Alaska’, Penstemon barbatus Roth var. praecox nanus rondo, and Penstemon × mexicali Mitch. ‘Red Rocks’. Plants were irrigated at frequencies of 1 (control), 2, or 4 weeks between June and September, simulating well-watered conditions, moderate drought, or severe drought. Osmotic potential (Ψ_s), gas exchange, visual quality, leaf area, and dry weight were assessed. In a confined root zone, P. barbatus showed the greatest tolerance to all levels of drought, avoiding desiccation by increasing root:shoot ratio and decreasing stomatal conductance as water became limiting. L. angustifolia and P. × mexicali showed tolerance to moderate drought conditions, but died after exposure to the first episode of severe drought. Neither G. aristata nor L. superbum were able to regulate shoot water loss effectively. Instead, both species displayed drought avoidance mechanisms, dying back when water was limiting and showing new growth after they were watered. Compared to control plants, G. aristata shoot dry weight was reduced by 50% and 84%, and L. superbum shoot dry weight was reduced by 47% and 99% for the 2- and 4-week irrigation intervals, respectively. Root dry weights were affected similarly for both species. E. purpurea exhibited poor visual quality at all irrigation intervals, in particular wilting severely in both drought treatments, but regaining turgor when watered again. P. barbatus is recommended for ornamental landscapes that receive little or no supplemental irrigation, while E. purpurea is not recommended for low water landscapes because of low visual quality under even mild drought.  相似文献   

Enhanced micropropagation of Dendrobium huoshanense C.Z. Tang et S.J. Cheng through protocorm-like bodies: The effects of cytokinins,carbohydrate sources and cold pretreatment     

Jian-Ping Luo  Christoph Wawrosch  Brigitte Kopp 《Scientia Horticulturae》2009

The effects of cytokinins, carbohydrate sources and cold pretreatment on the conversion of protocorm-like bodies (PLBs) to shoots were investigated for the enhancement of micropropagation of Dendrobium huoshanense C.Z. Tang et S.J. Cheng, an endangered medicinal plant in China. The effects of cytokinins and carbohydrate sources on the conversion of PLBs to shoots depended on their types and concentrations. The best results in terms of shoot development from PLBs occurred on 1/2 MS medium supplemented with 20 μM kinetin and 10 g l⁻¹ maltose. Cold pretreatment at 10 °C for 1–2 weeks significantly enhanced the conversion of PLBs to shoots, and over 1300 shoots were obtained from one gram of PLBs after 3 months of culture. The developed shoots were rooted on growth regulator-free MS medium supplemented with 8 g/l banana paste to give complete plantlets, which were successfully acclimatized with a survival rate of approximately 65%. The results indicate that a suitable cold pretreatment (10 °C for 1 week) followed by the use of 20 μM kinetin and 10 g/l maltose in 1/2 MS medium would produce a large number of shoots from PLBs for plantlet regeneration of D. huoshanense.  相似文献   

Influence of dietary algal N-3 fatty acids on breeding induced inflammation and endometrial cytokine expression in mares bred with frozen semen     

J.P. Brendemuehl  K. Kopp  J. Altman 《Journal of Equine Veterinary Science》2014

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Cardiovascular actions of cadmium at environmental exposure levels   总被引：3，自引：0，他引：3  

S J Kopp  T Glonek  H M Perry  M Erlanger  E F Perry 《Science (New York, N.Y.)》1982,217(4562):837-839

A low intake of dietary cadmium induces specific dose-dependent functional and biochemical changes in the cardiovascular tissues of rats. Maximum changes occur when the cadmium intake is 10 to 20 micrograms per kilogram of body weight per day. The changes reflect the accumulation of "critical" concentrations of cadmium in the cardiovascular tissues. The biologic activity of cadmium is demonstrated for intakes that approach those of the average American adult exposed to the usual environmental concentrations of the element but not to industrial concentrations. The sensitivity of the cardiovascular system to low doses of cadmium could not be anticipated by extrapolation from data on exposure to high concentrations of cadmium. The data support the hypothesis that ingested or inhaled environmental cadmium may contribute to essential hypertension in humans.  相似文献   

Chiral fiber gratings     

Kopp VI  Churikov VM  Singer J  Chao N  Neugroschl D  Genack AZ 《Science (New York, N.Y.)》2004,305(5680):74-75

Chiral gratings with double helix symmetry were produced by twisting glass optical fiber with a noncircular core cross section as it passed through a miniature oven. We observed polarization-selective transmission in chiral fibers with pitches of tens of micrometers. Two modes of optical interaction were differentiated. In chirallong-period gratings, dips in transmission were observed at wavelengths associated with scattering into distinct cladding modes mediated by the chiral grating. In chiral intermediateperiod gratings, a broad scattering band was observed. These gratings can be used to produce sharp or broad polarization-selective filters.  相似文献   

Transient events in space     

Kopp RA 《Science (New York, N.Y.)》1978,200(4346):1142-1143

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