全文获取类型
收费全文 | 232篇 |
免费 | 3篇 |
国内免费 | 2篇 |
专业分类
化学 | 138篇 |
力学 | 28篇 |
数学 | 45篇 |
物理学 | 26篇 |
出版年
2023年 | 2篇 |
2022年 | 7篇 |
2021年 | 5篇 |
2020年 | 4篇 |
2019年 | 1篇 |
2018年 | 3篇 |
2017年 | 2篇 |
2016年 | 10篇 |
2015年 | 7篇 |
2014年 | 3篇 |
2013年 | 15篇 |
2012年 | 20篇 |
2011年 | 16篇 |
2010年 | 7篇 |
2009年 | 8篇 |
2008年 | 7篇 |
2007年 | 9篇 |
2006年 | 4篇 |
2005年 | 8篇 |
2004年 | 6篇 |
2003年 | 9篇 |
2002年 | 8篇 |
2001年 | 7篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 7篇 |
1995年 | 8篇 |
1994年 | 6篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1984年 | 5篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1971年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有237条查询结果,搜索用时 15 毫秒
101.
Alessandra Falleni Stefania Moscato Giovanni Fulvio Enza Polizzi Margherita Bernardeschi Francesco Bianchi Valentina Donati Manuela Cabiati Chiara Ippolito Silvia Del Ry Chiara Baldini Letizia Mattii 《Molecules (Basel, Switzerland)》2022,27(18)
Connexins (Cxs) are transmembrane proteins involved in the formation of hemichannels and gap junctions (GJs). GJs are involved in various physiological functions, including secretion in glandular tissue. It has been demonstrated that Cx26, Cx32, and Cx43 are mainly expressed in glands, but no data are available in human salivary glands to date. The aim of our study was to investigate the presence and the localization of Cxs in human minor labial salivary glands. Immunofluorescence and immunoelectron microscopy were employed to evaluate the Cx26, Cx32, and Cx43 protein in human labial salivary gland biopsies (hLSGBs). RT-PCR was also used to detect their mRNA expression. Cx expression was found at both the mRNA and protein levels in all hLSGBs analysed. Cxs were observed at the level of the duct and acinar cells, as well as in myoepithelial cells. The localization of the three Cx types was very similar, suggesting colocalization of these Cxs in the same connexons. These results demonstrated the presence of Cxs in human salivary glands for the first time. Moreover, the few samples with primary Sjögren’s Syndrome analysed only by immunofluorescence showed an alteration of the Cx expression, indicating that these proteins could be involved in salivary gland dysfunctions. 相似文献
102.
103.
Fulvio Anzani Piero Dalla Croce Riccardo Stradi 《Journal of heterocyclic chemistry》1980,17(2):311-313
The reaction between hydrazonoyl halides and N-arylbenzamidines leads to the simultaneous formation of products derived from a substitution and a cycloaddition reaction via two independent paths. 相似文献
104.
105.
By studying the contraction of K to inside the Iwasawa decomposition of a semisimple Lie group of real rank 1, we realize the representations of as limits of representations of K, obtaining in particular, limiting formulas for matrix entries. 相似文献
106.
107.
Maddalena Corsini Serena Losi Emanuela Grigiotti Fulvio Rossi Piero Zanello Alexander R. Kudinov Dmitry A. Loginov Mikhail M. Vinogradov Zoya A. Starikova 《Journal of Solid State Electrochemistry》2007,11(12):1643-1653
The reduction behavior of the isoelectronic complexes [CpMIII(η6-C6R6)]2+ (M=Rh, Ir; R=H, Me) and [(η-9-SMe2-7,8-C2B9H10)MIII(η6-C6R6)]2+ (M=Rh, Ir; C6R6 = C6H6, C6H5OMe, C6H3Me3) has been studied by cyclic voltammetry and controlled potential coulometry in acetonitrile and propylene carbonate at 253
and 298 K, respectively. The extent of chemical reversibility of the pertinent sequences Rh(III)/Rh(II)/Rh(I) and Ir(III)/Ir(I)
is highly dependent on both the nature of the solvent and the intrinsic electronic properties of the arene substituents. The
arene η6 coordination makes the derivatives in their lower oxidation states notably short lived, even if, in some cases, the use of
propylene carbonate improves their stability or causes the increase in their lifetimes before changing the arene coordination
from η6 to η4. Cations [(η-9-SMe2-7,8-C2B9H10)M(η6-C6R6)]2+ were obtained by the bromide abstraction from [(η-9-SMe2-7,8-C2B9H10)MBr2]2 with Ag+ in the presence of benzene and its derivatives. The structure of [(η-9-SMe2-7,8-C2B9H10)Ir(η6-C6H5OMe)](BF4)2 was determined by X-ray diffraction. 相似文献
108.
Mario Giannella Fulvio Gualtieri Walter Fedeli Silvio Cerrini Enrico Gavuzzo 《Journal of heterocyclic chemistry》1983,20(2):385-391
The reaction between methyl or ethyl esters of 1, 2-benzisoxazole-3-acetic acid and iso-amyl nitrite is reported. The main product is identified as 4-(2′-hydroxyphenyl)furazan-3-carboxylic acid ( 4 ) by chemical and X-ray crystal structure analyses. The synthesis of esters of E- and Z-α-(hydroxyimino)-1, 2-benzisoxazole-3-acetic acid is also reported. 相似文献
109.
John O. Edwards Ruth H. Pater Ruggero Curclf Fulvio Di Furia 《Photochemistry and photobiology》1979,30(1):63-70
Abstract— Kinetics and 18O-labeling studies have provided evidence for the involvement of dioxirane intermediates (V) in the ketone-catalysed decomposition of peroxomonosulfate (Caroate) HSO;. Reaction rates depend on ketone structure. In competition with catalysis of peroxide decomposition, the dioxirane intermediate is capable of oxidizing several organic and inorganic substrates. Thus, cis- and rrans-cinnammic acids could be converted stereospecifically into the corresponding epoxides. Also, oxidation of phenylpropiolic acid, a substrate which is representative of weakly nucleophilic alkynes, could be carried out using the Caroatehetone oxidizing system. Under the conditions adopted, no oxidation of the substrates examined was found to occur in the absence of ketone. The possibility that formation of dioxathiirane intermediates (XXII) occurs following a side pathway in the reaction of Caroate with sulfoxides (which produces sulfones in high yield) has been explored. Preliminary experiments using 18O-labeling of p-tolyl phenylsulfoxide, however. failed to support this hypothesis. pointing out the need for further detailed studies. 相似文献
110.