全文获取类型
收费全文 | 105篇 |
免费 | 1篇 |
国内免费 | 4篇 |
专业分类
化学 | 49篇 |
数学 | 16篇 |
物理学 | 45篇 |
出版年
2022年 | 1篇 |
2019年 | 1篇 |
2016年 | 1篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 5篇 |
2012年 | 3篇 |
2011年 | 19篇 |
2010年 | 7篇 |
2009年 | 1篇 |
2008年 | 5篇 |
2007年 | 4篇 |
2006年 | 3篇 |
2005年 | 2篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1996年 | 1篇 |
1994年 | 4篇 |
1993年 | 1篇 |
1992年 | 7篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1986年 | 4篇 |
1984年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1972年 | 2篇 |
1962年 | 1篇 |
1950年 | 1篇 |
1939年 | 1篇 |
1932年 | 1篇 |
1930年 | 1篇 |
1929年 | 1篇 |
1923年 | 1篇 |
1917年 | 1篇 |
1913年 | 1篇 |
1910年 | 1篇 |
1909年 | 1篇 |
1903年 | 1篇 |
1902年 | 5篇 |
1900年 | 1篇 |
1885年 | 1篇 |
排序方式: 共有110条查询结果,搜索用时 15 毫秒
1.
2.
The products of the reaction of OClO with NO3 were investigated between 220 and 298 K using a flow reactor and infrared, visible, and ultraviolet analysis. At temperatures below 250 K new infrared and ultraviolet absorption features were observed and assigned to the novel compound chloryl nitrate (O2ClONO2). Additionally, ClO and NO2 were observed as reaction products, indicating the existence of a second reaction channel. O2ClONO2 formation predominates at temperatures below 230 K. The reaction rate constant at 220 K is estimated to be on the order of 10(-14) cm3 molecule-1 s-1 in 1-5 Torr of helium. These observations suggest that O2ClONO2 may exist in the terrestrial stratosphere. 相似文献
3.
4.
When bromoform (CHBr3) is photolyzed at 266 or 303 nm in the presence of O2 and NO, the formation of secondary Br atoms is observed. By following the rate of growth of this secondary Br atom signal as a function of conditions, rate constants have been determined for the reactions CHBr2 + O2, CHBr2 + NO (both pressure-dependent), and CHBr2O2 + NO (k(2a) = (1.74 +/- 0.16) x 10(-11) cm3 molecule(-1) s(-1) at 23 degrees C). By measuring the amplitude of the secondary Br signal compared to the primary Br formed in the initial photolysis, it is established that the CHBr2O radical spontaneously decomposes to form CHBrO + Br at least 90%, and probably 100%, of the time, in agreement with previous work and with recent ab initio calculations. A survey of four other polybrominated methanes, CH2Br2, CHClBr2, CF2Br2, and CBr4, shows that they all generate secondary Br atoms when photolyzed at 266 nm in the presence of O2 and NO, suggesting that their reaction sequences are similar to that of bromoform. 相似文献
5.
Jannik Brückmann Dr. Carolin Müller Ilse Friedländer Dr. Alexander K. Mengele Prof. Kalina Peneva Prof. Benjamin Dietzek-Ivanšić Prof. Sven Rau 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(61):e202201931
The ambitious goal of artificial photosynthesis is to develop active systems that mimic nature and use light to split water into hydrogen and oxygen. Intramolecular design concepts are particularly promising. Herein, we firstly present an intramolecular photocatalyst integrating a perylene-based light-harvesting moiety and a catalytic rhodium center ( RhIIIphenPer ). The excited-state dynamics were investigated by means of steady-state and time-resolved absorption and emission spectroscopy. The studies reveal that photoexcitation of RhIIIphenPer yields the formation of a charge-separated intermediate, namely RhIIphenPer ⋅ + , that results in a catalytically active species in the presence of protons. 相似文献
6.
Proteins dotted on nitrocellulose membranes are biotinylated by reaction with a biotinyl-succinimide ester. The resulting biotinyl residues serve as specific binding sites for a subsequent streptavidin-based detection system. Using streptavidin-peroxidase, the proteins are visualized either by deposition of a colored formazan dye or by enhanced chemiluminescence the latter being twofold more sensitive. Alternatively, streptavidin-fluorescein isothiocyanate (FITC) is substituted for the peroxidase conjugate as tool for protein staining. The sensitivity of both staining variants is dramatically improved by the inclusion of the reporter deposition technique. The fluorescence-labeled proteins are visualized on a visible blue light emitting illuminator preventing the bothering effect of photobleaching. In combination with a charge-coupled device (CCD) camera-based image analyzing system the established stain with streptavidin-FITC detects about 10 pg of protein dot blotted on nitrocellulose membranes. 相似文献
7.
A. Tschirch H. Rosenthal G. Friedl?nder und W. Schneiter 《Fresenius' Journal of Analytical Chemistry》1929,76(7-8):312-314
Ohne Zusammenfassung 相似文献
8.
9.
Juliana S Luz Celso RR Ramos Márcia CT Santos Patricia P Coltri Fernando L Palhano Debora Foguel Nilson IT Zanchin Carla C Oliveira 《BMC biochemistry》2010,11(1):22
Background
The archaeal exosome is formed by a hexameric RNase PH ring and three RNA binding subunits and has been shown to bind and degrade RNA in vitro. Despite extensive studies on the eukaryotic exosome and on the proteins interacting with this complex, little information is yet available on the identification and function of archaeal exosome regulatory factors. 相似文献10.
Khachatryan V Sirunyan AM Tumasyan A Adam W Bergauer T Dragicevic M Erö J Fabjan C Friedl M Frühwirth R Ghete VM Hammer J Hänsel S Hartl C Hoch M Hörmann N Hrubec J Jeitler M Kasieczka G Kiesenhofer W Krammer M Liko D Mikulec I Pernicka M Rohringer H Schöfbeck R Strauss J Taurok A Teischinger F Wagner P Waltenberger W Walzel G Widl E Wulz CE Mossolov V Shumeiko N Suarez Gonzalez J Benucci L Cerny K De Wolf EA Janssen X Maes T Mucibello L Ochesanu S Roland B Rougny R Selvaggi M Van Haevermaet H 《Physical review letters》2011,106(11):112001
Measurements of the total and differential cross sections dσ/dp(T)(B) and dσ/dy(B) for B(+) mesons produced in pp collisions at sqrt[s]=7 TeV are presented. The data correspond to an integrated luminosity of 5.8 pb(-1) collected by the CMS experiment operating at the LHC. The exclusive decay B(+)→J/ψK(+), with J/ψ→μ(+)μ(-), is used to detect B(+) mesons and to measure the production cross section as a function of p(T)(B) and y(B). The total cross section for p(T)(B)>5 GeV and |y(B)|<2.4 is measured to be 28.1±2.4±2.0±3.1 μb, where the first uncertainty is statistical, the second is systematic, and the last is from the luminosity measurement. 相似文献