全文获取类型
收费全文 | 120篇 |
免费 | 0篇 |
专业分类
化学 | 34篇 |
力学 | 16篇 |
数学 | 26篇 |
物理学 | 44篇 |
出版年
2019年 | 2篇 |
2018年 | 2篇 |
2016年 | 5篇 |
2014年 | 2篇 |
2013年 | 3篇 |
2012年 | 3篇 |
2011年 | 4篇 |
2010年 | 2篇 |
2009年 | 8篇 |
2008年 | 2篇 |
2007年 | 6篇 |
2006年 | 6篇 |
2005年 | 4篇 |
2004年 | 1篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 3篇 |
2000年 | 7篇 |
1999年 | 2篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1982年 | 2篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1970年 | 2篇 |
1968年 | 1篇 |
1962年 | 2篇 |
1946年 | 1篇 |
1929年 | 1篇 |
1926年 | 1篇 |
1925年 | 1篇 |
1922年 | 1篇 |
1920年 | 1篇 |
1919年 | 1篇 |
1916年 | 1篇 |
1873年 | 1篇 |
1869年 | 1篇 |
1858年 | 1篇 |
排序方式: 共有120条查询结果,搜索用时 15 毫秒
51.
Epixenosomes, epibiontic organisms living on the protozoon ciliate Euplotidium itoi, like prokaryotes, lack a true nucleus surrounded by a nuclear envelope. However, their cytoplasm, at least in the mature state, is somehow compartmentalized by the presence of a complex extrusive apparatus surrounded by a form of basket consisting of bundles of tubules (BT), 20–24 nm in diameter, delineated by a wall made of globular subunits. The nature of these tubules was investigated by means of in vivo experiments, ultrastructural analysis and immunocytochemistry by both fluorescence and electron microscopy. It has been found that BT, besides being well preserved when fixed in the presence of tannic acid, are sensitive to factors known to depolymerize cytoplasmic microtubules in a variety of cells such as nocodazole and cold and show a positive immunoreaction against different antitubulin antibodies. On the basis of all the results obtained, the hypothesis that the epixenosomal BT consist of tubulin acquires a strong credibility. This is particularly interesting if we consider that tubulin in prokaryotes has never been conclusively demonstrated. 相似文献
52.
High resolution gas chromatography-mass spectrometry has been used to detect anabolic steroids in urine. With fused silica capillary columns connected directly to mass spectrometer, the anabolic steroids could be detected after extraction, hydrolysis, and derivatization with a sensitivity better then 1 ppb. In vivo excretion and metabolism has been investigated for androstanolone, methandriol, oxymesterone, quindenione, and boldenone. 相似文献
53.
Antoniazzi L Arenton M Cao Z Chen T Conetti S Cox B Delchamps S Fortney L Guffey K Haire M Ioannou P Jenkins CM Judd DJ Kourkoumelis C Manousakis-Katsikakis A Kuzminski J LeCompte T Marchionni A He M Mazur PO Murphy CT Pramantiotis P Rameika R Resvanis LK Rosati M Rosen J Shen C Shen Q Simard A Smith RP Spiegel L Stairs DG Tan Y Tesarek RJ Turkington T Turnbull L Turkot F Tzamarias S Voulgaris G Wagoner DE Wang C Yang W Yao N Zhang N Zhang X Zioulas G Zou B 《Physical review D: Particles and fields》1994,49(1):543-546
54.
Antoniazzi L Arenton M Cao Z Chen T Conetti S Corti G Cox B Delchamps S Fortney L Guffey K Haire M Ioannou P Jenkins CM Judd DJ Kourkoumelis C Manousakis-Katsikakis A Kuzminski J LeCompte T Marchionni A He M Mazur PO Murphy CT Pramantiotis P Rameika R Resvanis LK Rosati M Rosen J Shen C Shen Q Simard A Smith RP Spiegel L Stairs DG Tan Y Tesarek RJ Turkington T Turnbull L Turkot F Tzamarias S Voulgaris G Wagoner DE Wang C Yang W Yao N Zhang N Zhang X Zioulas G Zou B 《Physical review D: Particles and fields》1994,50(7):4258-4264
55.
Layered zirconium phosphate and phosphonate as heterogeneous catalyst in the preparation of pyrroles
Massimo Curini Francesca MontanariOrnelio Rosati Eduardo LioyRoberto Margarita 《Tetrahedron letters》2003,44(20):3923-3925
Pyrroles may be prepared by condensation of alkyl and aryl amines and 1,4-diketones (Paal-Knorr reaction) under potassium exchanged layered Zirconium phosphate and zirconium sulfophenyl phosphonate catalyst in solvent free conditions. 相似文献
56.
Luigi Antonio Rosati 《Geometriae Dedicata》1988,27(3):295-299
Let H(q
2) be the Hughes plane on the regular nearfield of order q
2 whose center is a field of order q. We construct in H(q
2) a unital of parameter q.
Lavoro eseguito nell'ambito di attività di ricerca finanziate dal M.P.I. (fondi 60% e 40%). 相似文献
Lavoro eseguito nell'ambito di attività di ricerca finanziate dal M.P.I. (fondi 60% e 40%). 相似文献
57.
Luigi Antonio Rosati 《Annali di Matematica Pura ed Applicata》1962,59(1):213-227
Sunto In uno spazio proiettivo sopra un corpo qualunqůe si infroducono delle ipersuperficie generalizzanti le quadriche studiate
daB. Segre e se ne studiano la proprietà. In particolare si considerano superficie e curve del secondo e terzo ordine. Si tra’ta anche
una questione relativa a piani grafici non desarguesiani. 相似文献
58.
Antoniazzi L Arenton M Cao Z Chen T Conetti S Cox B Delchamps S Fortney L Guffey K Haire M Ioannou P Jenkins CM Judd DJ Kourkoumelis C Manousakis-Katsikakis A Kuzminski J LeCompte T Marchionni A He M Mazur PO Murphy CT Pramantiotis P Rameika R Resvanis LK Rosati M Rosen J Shen C Shen Q Simard A Smith RP Spiegel L Stairs DG Tan Y Tesarek RJ Turkington T Turnbull L Turkot F Tzamarias S Voulgaris G Wagoner DE Wang C Yang W Yao N Zhang N Zhang X Zioulas G Zou B 《Physical review letters》1993,70(4):383-386
59.
Massimo Curini Francesco Epifano Maria Carla Marcotullio Ornelio Rosati Monia Rossi 《合成通讯》2013,43(7):1319-1329
Layered zirconium sulfophenyl phosphonate was found to be an efficient heterogeneous catalyst for the acetylation of alcohols and phenols. 相似文献
60.