全文获取类型
收费全文 | 399篇 |
免费 | 1篇 |
专业分类
化学 | 309篇 |
晶体学 | 1篇 |
数学 | 13篇 |
物理学 | 77篇 |
出版年
2021年 | 7篇 |
2019年 | 3篇 |
2018年 | 4篇 |
2017年 | 6篇 |
2016年 | 5篇 |
2015年 | 3篇 |
2012年 | 13篇 |
2011年 | 9篇 |
2010年 | 5篇 |
2008年 | 4篇 |
2007年 | 11篇 |
2006年 | 6篇 |
2005年 | 10篇 |
2004年 | 8篇 |
2003年 | 3篇 |
2002年 | 10篇 |
2001年 | 8篇 |
2000年 | 3篇 |
1999年 | 8篇 |
1998年 | 5篇 |
1997年 | 9篇 |
1996年 | 9篇 |
1995年 | 8篇 |
1994年 | 12篇 |
1993年 | 8篇 |
1992年 | 6篇 |
1991年 | 7篇 |
1990年 | 7篇 |
1989年 | 5篇 |
1988年 | 6篇 |
1987年 | 10篇 |
1986年 | 6篇 |
1985年 | 9篇 |
1981年 | 3篇 |
1980年 | 6篇 |
1979年 | 11篇 |
1978年 | 24篇 |
1977年 | 15篇 |
1976年 | 15篇 |
1975年 | 8篇 |
1974年 | 11篇 |
1973年 | 9篇 |
1972年 | 9篇 |
1971年 | 9篇 |
1970年 | 8篇 |
1969年 | 3篇 |
1968年 | 6篇 |
1967年 | 4篇 |
1966年 | 7篇 |
1965年 | 5篇 |
排序方式: 共有400条查询结果,搜索用时 15 毫秒
91.
M. A. Kuchenkova É. F. Redina N. L. Ovchinnikova P. Kh. Yuldashev 《Chemistry of Natural Compounds》1978,13(5):570-572
Summary 1. The 7S globulin of cotton seeds consists of eight polypeptide chains of two types differing by their contents of carbohydrates and of amide groups.2. On the basis of the results of a study of the amino-acid sequences of the peptides obtained by cleaving the 7S globulin with trypsin and chymotrypsin, its complete primary structure has been put forward.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 687–690, September–October, 1977. 相似文献
92.
D. A. Khashimov Kh. G. Alimov B. D. Dzhalilov P. Kh. Yuldashev 《Chemistry of Natural Compounds》1986,22(5):593-595
The electrophoretic spectrum of the water-soluble proteins of the seeds and meal of the castor-oil plant has been studied. A correlation has been found between a decrease in the relative amount of electrophoretic components with Rf 0.04 and 0.11 and the hemagglutinating activity of the meal. 相似文献
93.
94.
S. Kh. Faizieva Z. A. Khushbaktova V. N. Syrov M. P. Yuldashev É. Kh. Batirov Sh. Sh. Sagdullaev 《Chemistry of Natural Compounds》1999,35(2):155-158
The total flavonoids have been isolated from the epigeal part ofThermopsis alterniflora andTh. dolichocarpa, and the roots and rhizomes ofVexibia alopecuroides, andRhaponticum carthamoides the compositions of the flavonoids present in each of the total extracts have been determined. It was found that the total flavonoid extracts investigated exhibited different degrees of hypolipidemic activity in relation to normal animals and animals with experimental hyperlipidemias. The total flavonoids fromTh. alterniflora possessed the most pronounced hyperlipidemic action.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent, fax (371) 120 64 75. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 174–177, March–April, 1999. 相似文献
95.
M. B. Izbosarov B. Kh. Abduazimov A. D. Vdovin E. L. Kristallovich M. P. Yuldashev N. D. Abdullaev 《Chemistry of Natural Compounds》1999,35(6):621-624
A new flavonoid, mucroflavone A, is isolated from the terrestrial part ofTanacetopsis mucronata (Regel. et Schmalh.) S. Kovalevsk. IR, mass, UV, and PMR spectra are compared with those of related compounds to provide
a basis for proposing the structure 5,6,4′-trihydroxy-8,3′-dimethoxyflavone for mucroflavone A.
Deceased.
Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 725–729, November–December, 1999. 相似文献
96.
The temperature-dependent photoluminescence spectra of zinc oxide (ZnO) nanocrystals deposited inside the ultraviolet (UV) opal were studied. ZnO was grown in the voids between FCC packed SiO2 spheres using spray pyrolysis under ultrasonic vibration in the solution containing a zinc nitrate precursor. The ZnO nanoparticles inside opal matrix with UV photonic band-gap exhibit suppression of the excitonic emission and enhancement of the deep level emission. Suppression of the excitonic lines is due to the inhibition of spontaneous emission, while enhancement and broadening of the DL emission in the green spectral region is due to Purcell effect. The infiltration of ZnO nanoparticles inside the photonic crystal may be a useful technique to increase its emission efficiency in the selected spectral region. 相似文献
97.
A method has been developed for the quantitative estimation of ricinine in extracts and meal from two castor-oil plant seed tosters.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Fax (3712) 62 73 48. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 271–274, March–April, 1994. 相似文献
98.
99.
M. P. Yuldashev É. Kh. Batirov V. M. Malikov P. Kh. Yuldashev 《Chemistry of Natural Compounds》1993,29(3):303-305
Naringenin 7-O-(6″-O-p-coumaroly-β-D-glucopyranoside) and the new flavanone naringenin 7-O-(2″-O-p-coumaroyl-β-D-glucopyranoside) have been isolated from the seeds of Ricinus communis L. The structures of the compounds isolated were established on the basis of the results of chemical transformations and spectral characteristics. 相似文献
100.