全文获取类型
收费全文 | 67篇 |
免费 | 7篇 |
专业分类
林业 | 1篇 |
综合类 | 6篇 |
畜牧兽医 | 63篇 |
园艺 | 2篇 |
植物保护 | 2篇 |
出版年
2018年 | 1篇 |
2017年 | 2篇 |
2016年 | 4篇 |
2015年 | 1篇 |
2013年 | 2篇 |
2012年 | 1篇 |
2010年 | 1篇 |
2009年 | 1篇 |
2007年 | 2篇 |
2006年 | 1篇 |
2002年 | 1篇 |
1999年 | 1篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1990年 | 8篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 5篇 |
1985年 | 2篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1975年 | 1篇 |
1973年 | 4篇 |
1972年 | 2篇 |
1970年 | 3篇 |
1969年 | 5篇 |
1968年 | 5篇 |
1966年 | 1篇 |
排序方式: 共有74条查询结果,搜索用时 15 毫秒
1.
Plasmids and resistance to antimicrobial agents and heavy metals in Staphylococcus hyicus from pigs and cattle 总被引:1,自引:0,他引:1
S Schwarz H Blobel 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1989,36(9):669-673
Staphylococcus hyicus-cultures, isolated from piglets and cattle with skin lesions were investigated for their plasmid content and their resistance to antimicrobial agents and heavy metals. Several plasmids of different sizes could be detected in most of the 32 "porcine" S. hyicus-isolates, whereas none of the 20 "bovine" S. hyicus-cultures possessed any plasmid. The "porcine" S. hyicus-isolates were much more resistant to antimicrobial substances than the "bovine" S. hyicus-cultures. However, the "porcine" and "bovine" S. hyicus-cultures did not differ in their resistance to heavy metals. 相似文献
2.
Detection of a novel chloramphenicol resistance plasmid from "equine" Staphylococcus sciuri 总被引:3,自引:0,他引:3
S Schwarz M Cardoso H Blobel 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1990,37(9):674-679
A small chloramphenicol resistance (Cm) plasmid of 4.65 kB could be detected in an "equine" Staphylococcus sciuri-culture. This plasmid, designated as pSC3, was identified by interspecific protoplast transformation. On the basis of restriction endonuclease analyses a detailed restriction map of pSC3 could be constructed. This allowed structural comparisons of pSC3 with Cm-plasmids of other staphylococcal species from infections of humans and animals and identification of pSC3 as a member of the pC 221-family of staphylococcal Cm-plasmids. The pSC3-plasmid encoded an inducible chloramphenicol acetyltransferase as confirmed by enzymatic assays. This enzyme could be demonstrated in cell-free lysates of Cm-induced pSC3-transformants. 相似文献
3.
S Schwarz M Cardoso H Blobel 《DTW. Deutsche tier?rztliche Wochenschrift》1990,97(11):498, 501-498, 503
A total of 33 Staphylococcus hyicus-cultures from piglets with exudative epidermatitis were analyzed for the presence of antibiotic resistance plasmids. Four small plasmids encoding resistances to chloramphenicol, macrolide-lincosamide-antibiotics, streptomycin or tetracyclines could be identified in plasmid-curing and plasmid-transformation experiments. For further characterization these plasmids were digested with restriction endonucleases. This led to the construction of a specific restriction map for each of the 4 plasmids. On the basis of their restriction maps, these 4 antibiotic resistance plasmids from "porcine" S. hyicus-cultures were compared with the respective resistance plasmids of other staphylococcal species from infections of humans and animals. 相似文献
4.
5.
6.
7.
Isolation and restriction endonuclease analysis of a tetracycline resistance plasmid from Staphylococcus hyicus 总被引:3,自引:0,他引:3
A plasmid of 4.550 kb, conferring resistance to tetracycline, was demonstrated in Staphylococcus hyicus cultures from piglets with exudative epidermidis. The plasmid-encoded properties were determined both by curing and interspecific protoplast transformation experiments. The tetracycline resistance (TET) plasmid, designated pST1, was characterized by restriction endonuclease analysis and a preliminary restriction map was constructed. The pST1 plasmid was demonstrated in 19 (57.6%) of 33 S. hyicus cultures by Southern blot hybridization. It was also detectable by electron microscopy. 相似文献
8.
Nuclei from rat liver: isolation method that combines purity with high yield 总被引:170,自引:0,他引:170
9.
RP Andres T Bein M Dorogi S Feng JI Henderson CP Kubiak W Mahoney RG Osifchin R Reifenberger 《Science (New York, N.Y.)》1996,272(5266):1323-1325
Double-ended aryl dithiols [alpha,alpha'-xylyldithiol (XYL) and 4,4'-biphenyldithiol] formed self-assembled monolayers (SAMs) on gold(111) substrates and were used to tether nanometer-sized gold clusters deposited from a cluster beam. An ultrahigh-vacuum scanning tunneling microscope was used to image these nanostructures and to measure their current-voltage characteristics as a function of the separation between the probe tip and the metal cluster. At room temperature, when the tip was positioned over a cluster bonded to the XYL SAM, the current-voltage data showed "Coulomb staircase" behavior. These data are in good agreement with semiclassical predictions for correlated single-electron tunneling and permit estimation of the electrical resistance of a single XYL molecule (approximately18 ± 12 megohms). 相似文献
10.
The local effects of isolated magnetic adatoms on the electronic properties of the surface of a superconductor were studied with a low-temperature scanning tunneling microscope. Tunneling spectra obtained near magnetic adsorbates reveal the presence of excitations within the superconductor's energy gap that can be detected over a few atomic diameters around the impurity at the surface. These excitations are locally asymmetric with respect to tunneling of electrons and holes. A model calculation based on the Bogoliubov-de Gennes equations can be used to understand the details of the local tunneling spectra. 相似文献