Clinical aspects of coliform mastitis in the bovine     

Ursula Weigt 《Veterinary research communications》1983,7(1):253-257

In 1979, 209 cows from 2742 patients in the clinic for obstetrics and gynecology suffered from coliform mastitis. Most of these animals had been sent to the clinic because of a general or local infectious disease, a delayed birth or a teat injury. Coliform mastitis developed secondarily. Only 12 animals (6%) had solely a mastitis and no other clinically recognisable disease. Most of them showed a secondary acetonemia (ketosis). The connection between hypoglycemia, disturbance of the body's own defense mechanism and development of a coliform mastitis is discussed. The frequent occurrence of coliform mastitis in dairy herds with sawdust bedding is not directly attributed to a coliform contamination of the bedding but indirectly to a lack of crude fibre content in the diet which results in a subclinical ketosis and a dysfunction of the leucocytic defense. Coliform mastitis predominantly is not a hygienic but a management problem.  相似文献   

Genetic variation of seedling traits responded to brassinosteroid and gibberellin inhibitors in maize (Zea mays) doubled haploid lines     

Kun Hu  Ying Xie  Chenglai Wu  Ursula K. Frei  Thomas Lübberstedt 《Plant Breeding》2020,139(5):870-882

The purpose of this study was to examine the genotypic variation in maize doubled haploid (DH) lines response to brassinosteroid and gibberellin inhibitors. Plant responses to hormone inhibitors were determined in growth chamber experiments using germination paper for three different seedling treatments: application of propiconazole (Pcz), uniconazole (Ucz) or water (control). Mesocotyl length (ML) was more sensitive to hormone inhibitors, especially to the Ucz treatment, than other seedling traits. ML was significantly correlated with other traits in the Ucz treatment. All the seedling traits showed moderate-to-high broad sense heritability values, ranging from 0.39 to 0.82. The Euclidian genetic distances of inbred line pairs ranged from 1.27 to 19.94, indicating there was a high level of variability across the maize DH lines used in this study. DH lines with extreme MLs were identified, which can provide valuable breeding resources for improving abiotic stress tolerance, and for further genetic studies.  相似文献   

Effect of harvesting and drying conditions on chlorophyll levels of soybean (Glycine max L. Merr)     

Gomes MS  Sinnecker P  Tanaka RT  Lanfer-Marquez UM 《Journal of agricultural and food chemistry》2003,51(6):1634-1639

Chlorophyll in soybean represents a downgrading factor for the crops. Five Brazilian cultivars were harvested between R(6) and R(8) stage of development (Fehr & Caviness scale) and dried at 25 degrees and 40 degrees C. The effect of maturity stages and two drying conditions after harvest were studied to achieve reduction of moisture and chlorophylls to acceptable levels. When seeds were dried at 25 degrees C, even harvesting at early stages of development such as R(6), the green pigments were almost degraded, and 16 ppm of chlorophyll were found at maximum, accompanied by loss of moisture. Moisture and chlorophyll declines as seed matures, but at intermediary stages (R(6)-R(7)), chlorophyll degrades first, so the rate of moisture loss should not be used to predict chlorophyll contents. At 40 degrees C, complete degradation of chlorophyll pigments is only achieved when seeds are swathed from R(7) stage up, otherwise the seed quality could be compromised. Slow drying allows almost complete removal of green pigments, even when seeds are swathed a few days before the physiological maturity stage.  相似文献   

Structure-activity relationships of triazinone herbicides on resistant weeds and resistant Chlamydomonas reinhardtii     

Walter Oettmeier  Ursula Hilp  Wilfried Draber  Carl Fedtke  Robert R. Schmidt 《Pest management science》1991,33(4):399-409

Weeds resistant to the s-triazine herbicide atrazine also show resistance to the triazinone herbicide metribuzin. However, with highly lipophilic triazinones, thylakoids isolated from atrazine-resistant Amaranthus retroflexus (mutation at position Ser₂₆₄ of the photosystem II D-1 reaction centre protein) in general show a higher pI₅₀ value in photosystem II electron transport than those from the wild type (i.e. negative cross-resistance; ‘supersensitivity’). A quantitative structure–activity relationship (QSAR) can be established, wherein the lipophilicity of the compound plays a major role. In in-vivo experiments, it was found that the triazinone DRW2698 killed resistant Amaranthus retroflexus and Chenopodium album whereas the wild type was almost unaffected. Triazinones were further investigated in five different mutants of Chlamydomonas rheinhardtii (mutations in the D-1 protein at positions Ser₂₆₄, Ala₂₅₁, Leu₂₇₅, Phe₂₅₅, and Val²¹⁹). Inhibitory activity of all triazinones was generally enhanced in the Phe₂₅₅ mutant but decreased in the Val₂₁₉ mutant. In the other mutants, biological activity was decreased when position 3 of the triazinone was substituted by CH₃, OCH₃, SCH₃, NHCH₃ or N(CH₃)₂. However, negative cross-resistance was again observed when this position was occupied by free thiol. It is therefore suggested that these two groups of triazinones orient themselves differently within the herbicide binding niche of the photosystem II D-1 protein.  相似文献   

Effect of pyrethroids on carbohydrate metabolic pathways in common carp,Cyprinus carpio     

K Kamalaveni  V Gopal  Ursula Sampson  D Aruna 《Pest management science》2001,57(12):1151-1154

The activity levels of succinate dehydrogenase (SDH) and glucose‐6‐phosphate dehydrogenase (G6PD) were assessed in various tissues of Cyprinus carpio var communis which had been exposed to lethal concentrations of group‐II pyrethroids (deltamethrin, cypermethrin, fenvalerate and fluvalinate) for a period of 72 h. The results indicated a steady decrease in SDH activity with a concomitant increase in G6PD activity. The decreased SDH activity indicated inhibition of SDH at mitochondrial level and the increased G6PD activity an enhancement of an alternative pathway of carbohydrate metabolism, viz the hexose monophosphate shunt (HMP) or pentose phosphate pathway as a biochemical adaptation to overcome the toxic stress. © 2001 Society of Chemical Industry  相似文献   

Suspected chlamydial polyarthritis in a calf in the UK     

Twomey DF  Griffiths PC  Hignett BC  Martin TP 《The Veterinary record》2003,152(11):340

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Poor reproductive performance in pigs     

Gibbens JC  Twomey DF  Cook AJ  Byrne CA  Thomson JR  Kennedy S 《The Veterinary record》2003,152(20):634

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Malignant catarrhal fever in cattle with suspected bracken poisoning     

Twomey DF  Holt GJ  Reid HW 《The Veterinary record》2002,151(16):486-487

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Toxoplasmosis in a western grey kangaroo in the UK     

Twomey DF  Higgins RJ  Sayers G 《The Veterinary record》2002,151(23):711

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Identification of ocular matrix metalloproteinases present within the aqueous humor and iridocorneal drainage angle tissue of normal and glaucomatous canine eyes   总被引：1，自引：0，他引：1  

William L. Weinstein  Ursula M. Dietrich  John S. Sapienza§  K. Paige Carmichael†  Phillip A. Moore  Thomas M. Krunkosky‡ 《Veterinary ophthalmology》2007,10(S1):108-116

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