全文获取类型
收费全文 | 82篇 |
免费 | 10篇 |
专业分类
农学 | 4篇 |
24篇 | |
综合类 | 6篇 |
农作物 | 7篇 |
水产渔业 | 3篇 |
畜牧兽医 | 45篇 |
园艺 | 2篇 |
植物保护 | 1篇 |
出版年
2019年 | 4篇 |
2018年 | 1篇 |
2017年 | 4篇 |
2016年 | 3篇 |
2015年 | 5篇 |
2014年 | 6篇 |
2013年 | 5篇 |
2012年 | 9篇 |
2011年 | 13篇 |
2010年 | 4篇 |
2009年 | 5篇 |
2008年 | 1篇 |
2007年 | 6篇 |
2006年 | 4篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2002年 | 4篇 |
1999年 | 2篇 |
1996年 | 1篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1989年 | 1篇 |
1981年 | 1篇 |
1977年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有92条查询结果,搜索用时 656 毫秒
21.
22.
Ramos JR Howard RD Pleasant RS Moll HD Blodgett DJ Magnin G Inzana TJ 《Veterinary surgery : VS》2003,32(3):251-261
OBJECTIVE: To characterize the elution and bioactivity of metronidazole and gentamicin sulfate polymerized, individually and in combination, with polymethylmethacrylate (PMMA). STUDY DESIGN: In vitro experimental study. METHODS: PMMA beads containing metronidazole (3 concentrations), gentamicin sulfate, or metronidazole and gentamicin sulfate were immersed in 5 mL of phosphate-buffered saline in triplicate. Eluent was replaced at specified time intervals for 1 or 21 days, and antibiotic concentrations were measured by high-performance liquid chromatography. Changes in antibiotic bioactivity attributable to polymerization or copolymerization of the antibiotics with PMMA, ethylene oxide sterilization, and storage of AIPMMA beads containing metronidazole were evaluated. RESULTS: Antibiotic elution patterns were similar for all groups. Day 1 elution for groups containing metronidazole or gentamicin individually represented a mean 63%-66% and 79%, respectively, of the 21-day total. Approximately 50% of the day 1 elution occurred during the first hour. The elution of metronidazole was dose dependent. The elution of metronidazole (day 3-21) and gentamicin (all days) was significantly greater when metronidazole and gentamicin were combined (P <.05). The addition of metronidazole delayed polymerization of PMMA. Neither polymerization nor copolymerization of metronidazole and gentamicin with PMMA, gas sterilization, or 2-month storage of beads containing metronidazole significantly affected antimicrobial bioactivity. CONCLUSIONS: Metronidazole elution from PMMA was dose dependent. Copolymerization of metronidazole and gentamicin sulfate in PMMA resulted in increased rates of elution. Intraoperative preparation of metronidazole-impregnated PMMA beads is not practical, but sterilization and storage for 2 months should not affect efficacy. CLINICAL RELEVANCE: The local delivery of biologically active metronidazole and gentamicin by elution from PMMA is feasible. 相似文献
23.
Immunity to colonization of the respiratory tract by Mycoplasma bovis (formerly Mycoplasma agalactiae subsp. bovis was induced in calves by inoculation of formalin inactivated organisms. Animals inoculated intramuscularly and then intratracheally with inactivated mycoplasmas had significantly fewer M. bovis in their lungs, compared with non-vaccinated animals, 3 weeks after intratracheal challenge with viable organisms. In contrast, there was no significant difference in the numbers of M. bovis isolated from the lungs of control animals and of calves given two intramuscular inoculations of inactivated organisms. These results indicate that stimulation of the local immune system is important in the development of resistance to M. bovis respiratory infection following vaccination with inactivated organisms. 相似文献
24.
25.
Defining the epithelial stem cell niche in skin 总被引:4,自引:0,他引:4
Tumbar T Guasch G Greco V Blanpain C Lowry WE Rendl M Fuchs E 《Science (New York, N.Y.)》2004,303(5656):359-363
26.
Geraldine Moreno-Black Prapimporn Somnasang Sompong Thamathawan 《Agriculture and Human Values》1996,13(3):3-11
The tradition of planting and maintaining home gardens is an expression of culture and represents an intense interaction between humans and plants. Forty-nine home gardens in northeastern Thailand were surveyed and found to be quite rich and diverse. The gardens contained domesticated plants, species that are not native to the area, and local non-domesticates. We focused on women's gardening practices as behaviors that create an intensive interaction with the physical and social environment and found that women are increasing their management and manipulation of non-domesticated resources. Home gardens, maintained primarily by women, are part of a continuum of resource areas that are constructed and utilized. The maintenance of specific plants in the gardens provide a source of stability in the rapidly changing cultural, social, and economic environment. 相似文献
27.
A classification of the NORIN 10 and Tom Thumb dwarfing genes in British,Mexican, Indian and other hexaploid bread wheat varieties 总被引:1,自引:0,他引:1
Summary The two semi-dwarfing genes Rht1 and Rht2 from Norin 10 have now been incorporated in successful varieties in use in most major wheat growing areas. The more potent dwarfing gene, Rht3, from Tom Thumb has been used in a limited way.These genes may be identified and classified by assessing the associated character of GA-insensitivity in the progeny from test crosses.This paper describes these classifications in the CIMMYT, Mexican, PBI, Cambridge and Indian breeding programmes and for a number of other international varieties. 相似文献
28.
29.
Máire C. McElroy Martin Hill Geraldine Moloney Micheál Mac Aogáin Shane McGettrick Áine O’Doherty Thomas R. Rogers 《Irish veterinary journal》2015,69(1):10