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排序方式: 共有41条查询结果,搜索用时 31 毫秒
1.
In the present study a cytological, histological and morphometrical comparison between the ovaries of the llama, the cow and the sheep is presented, at two phases of the ovarian cycle. There were found differences in the amount of primordial and primary follicles, the size of secondary follicles and follicular cells, and type and distribution of the connective tissue inside the stroma of the ovary. It would be necessary to study the fine structure of the ovary and the so-called "embryological remnants", for its permanent appearance in most (50%) of the ovaries. 相似文献
2.
Streptococcus Suis: Past and Present 总被引:109,自引:0,他引:109
Staats J.J. Feder I. Okwumabua O. Chengappa M.M. 《Veterinary research communications》1997,21(6):381-407
Staats, J.J., Feder, I., Okwumabua, O. and Chengappa, M.M., 1997. Streptococcus suis: past and present. Veterinary Research Communications, 21 (6), 381-407Steptococcus suis is a Gram-positive, facultatively anaerobic coccus that has been implicated as the cause of a wide range of clinical disease syndromes in swine and other domestic animals. In swine, the disease has spread worldwide but is more prevalent in countries with intensive swine management practices. The disease syndromes caused by S. suis in swine include arthritis, meningitis, pneumonia, septicaemia, endocarditis, polyserositis, abortions and abscesses. S. suis has also been implicated in disease in humans, especially among abattoir workers and swine and pork handlers. In humans, S. suis type 2 can cause meningitis, which may result in permanent hearing loss, septicaemia, endocarditis and death. The pathogenic mechanism of S. suis is not well defined. Several virulence factors have been identified, but their roles in pathogenesis and disease have not been well elucidated. Much work is in progress on characterization of virulence factors and mechanisms, with emphasis on the control of the disease. Because of the non-availability of suitable immunoprophylaxis, control of S. suis infection has depended mainly on the use of antimicrobials. 相似文献
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Denschlag J Simsarian JE Feder DL Clark CW Collins LA Cubizolles J Deng L Hagley EW Helmerson K Reinhardt WP Rolston SL Schneider BI Phillips WD 《Science (New York, N.Y.)》2000,287(5450):97-101
Quantum phase engineering is demonstrated with two techniques that allow the spatial phase distribution of a Bose-Einstein condensate (BEC) to be written and read out. A quantum state was designed and produced by optically imprinting a phase pattern onto a BEC of sodium atoms, and matter-wave interferometry with spatially resolved imaging was used to analyze the resultant phase distribution. An appropriate phase imprint created solitons, the first experimental realization of this nonlinear phenomenon in a BEC. The subsequent evolution of these excitations was investigated both experimentally and theoretically. 相似文献
4.
Chien M Morozova I Shi S Sheng H Chen J Gomez SM Asamani G Hill K Nuara J Feder M Rineer J Greenberg JJ Steshenko V Park SH Zhao B Teplitskaya E Edwards JR Pampou S Georghiou A Chou IC Iannuccilli W Ulz ME Kim DH Geringer-Sameth A Goldsberry C Morozov P Fischer SG Segal G Qu X Rzhetsky A Zhang P Cayanis E De Jong PJ Ju J Kalachikov S Shuman HA Russo JJ 《Science (New York, N.Y.)》2004,305(5692):1966-1968
We present the genomic sequence of Legionella pneumophila, the bacterial agent of Legionnaires' disease, a potentially fatal pneumonia acquired from aerosolized contaminated fresh water. The genome includes a 45-kilobase pair element that can exist in chromosomal and episomal forms, selective expansions of important gene families, genes for unexpected metabolic pathways, and previously unknown candidate virulence determinants. We highlight the genes that may account for Legionella's ability to survive in protozoa, mammalian macrophages, and inhospitable environmental niches and that may define new therapeutic targets. 相似文献
5.
Falilou Diallo Dominique Masse Karamoko Diarra Frédéric Feder 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2020,70(3):215-223
ABSTRACTThe productivity levels of two arenosol (Ar40) and fluvisol (FL40) fields that had been cultivated for over 40 years were compared to that of fields with the same soils located nearby but never previously cultivated, i.e. Ar0 and FL0, respectively. Application of poultry manure (PM) and sewage sludge (SS) were compared to a mineral fertilizer (T100), corresponding to 100 kg/ha of nitrogen, over three lettuce (Lactuca sativa L.) crop cycles. PM and SS were applied at 50 and 150 kg/ha nitrogen equivalent fertilizer doses. Biomass production levels in the organic and mineral treatments were similar, except for the SS-50 for FL0 and the PM-150 for Ar40, FL40 and FL0. Biomass production levels of Ar40 were higher than those of Ar0 for the first cycle. In the initial state, the soil P content in Ar40 was higher than that of the Ar0 soil. With the treatment repetition, Ar0 showed the same production level as Ar40. For the fluvisols, biomass production levels of FL40 were lower than those of FL0 for the first cycle. Indeed, the initial nitrate content in FL40 was lower than in FL0. The biomass production levels of FL40 were higher than those of FL0 for the following cycles. 相似文献
6.
Adrenocortical suppression associated with topical otic administration of glucocorticoids in dogs 总被引:2,自引:0,他引:2
K A Moriello S L Fehrer-Sawyer D J Meyer B Feder 《Journal of the American Veterinary Medical Association》1988,193(3):329-331
Commercial otic preparations that contained dexamethasone or triamcinolone acetate were applied twice daily to both ears of 2 groups of dogs (n = 8). Marked adrenocortical suppression, reflected by low serum cortisol concentrations, was observed in all dogs. Results of ACTH response tests were blunted after 7 days of treatment. Twenty-one days after treatment, serum cortisol concentrations still were suppressed in all dogs, compared with pretreatment control concentrations. Fourteen days after cessation of otic treatment, 5 of 8 dogs still had inadequate release of cortisol in response to ACTH. 相似文献
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Thais Borges Lessa Rafael Cardoso Carvalho André Luis Rezende Franciolli Lilian Jesus de Oliveira RodrigoSilvadaNunes Barreto David Feder Fabiana Fernandes Bressan Maria Angélica Miglino Carlos Eduardo Ambrósio 《Acta veterinaria Scandinavica》2012,54(1):73