全文获取类型
收费全文 | 1254篇 |
免费 | 60篇 |
国内免费 | 4篇 |
出版年
2022年 | 20篇 |
2021年 | 40篇 |
2020年 | 24篇 |
2019年 | 29篇 |
2018年 | 35篇 |
2017年 | 38篇 |
2016年 | 41篇 |
2015年 | 50篇 |
2014年 | 69篇 |
2013年 | 93篇 |
2012年 | 96篇 |
2011年 | 70篇 |
2010年 | 62篇 |
2009年 | 36篇 |
2008年 | 52篇 |
2007年 | 45篇 |
2006年 | 57篇 |
2005年 | 43篇 |
2004年 | 20篇 |
2003年 | 19篇 |
2002年 | 17篇 |
2001年 | 24篇 |
2000年 | 21篇 |
1999年 | 11篇 |
1998年 | 10篇 |
1997年 | 12篇 |
1996年 | 10篇 |
1995年 | 6篇 |
1994年 | 10篇 |
1991年 | 13篇 |
1990年 | 10篇 |
1989年 | 19篇 |
1988年 | 12篇 |
1987年 | 17篇 |
1986年 | 13篇 |
1985年 | 13篇 |
1984年 | 12篇 |
1983年 | 9篇 |
1982年 | 10篇 |
1981年 | 14篇 |
1980年 | 11篇 |
1979年 | 10篇 |
1978年 | 5篇 |
1977年 | 6篇 |
1974年 | 10篇 |
1973年 | 6篇 |
1970年 | 5篇 |
1969年 | 5篇 |
1968年 | 5篇 |
1967年 | 11篇 |
排序方式: 共有1318条查询结果,搜索用时 15 毫秒
981.
982.
983.
Response of stomata in epidermal strips from green leaves ofTradescantia sillamontana and anthocyanin-rich purple leaves ofT. virginiana and from green and pigmented regions ofPedilanthus tithymaloides leaves, to ABA have been compared. Stomata from anthocyanin-rich leaves or leaf parts appeared to be relatively insensitive
to ABA as compared to those from green leaves or leaf parts. Observations indicate the possibility of the involvement of endogenous
anthocyanins in antagonising ABA in preventing the stomatal opening. 相似文献
984.
Kumarasamy Thangaraj Vempati Sridhar Toomas Kivisild Alla G. Reddy Gyaneshwer Chaubey Vijay Kumar Singh Suminder Kaur Pooja Agarawal Amit Rai Jalaj Gupta Chandana Basu Mallick Niraj Kumar Thrimulaisamy P. Velavan Rajanbabu Suganthan Divi Udaykumar Rashmi Kumar Rachana Mishra Arif Khan Chitikineni Annapurna Lalji Singh 《Human genetics》2006,119(1-2):223-224
985.
986.
Differential expression of virulence genes and role of gyrA mutations in quinolone resistant and susceptible strains of Salmonella Weltevreden and Newport isolated from seafood 下载免费PDF全文
V.K. Deekshit B.K. Kumar P. Rai I. Karunasagar I. Karunasagar 《Journal of applied microbiology》2015,119(4):970-980
987.
Prashant Kumar Rai Sanjukta Chatterji Nilesh K. Rai Awadhesh K. Rai Dane Bicanic Geeta Watal 《Food biophysics》2010,5(1):17-23
The scientific evaluation of the antidiabetic efficacy of aqueous extract of Trichosanthes dioica fruits on streptozotocin-induced diabetic rats is being presented. The graded doses of the extract, viz., 500, 750, 1,000,
and 1,250 mg/kg body weight (bw), were administered orally, and it was observed that the blood glucose concentration decreased
in a dose-dependent manner. The dose of 1,000 mg/kg bw showed the maximum fall of 23.8% and 19.1% in blood glucose level (BGL)
during fasting BGL and glucose tolerance test (GTT) studies, respectively, of nondiabetic rats. Whereas in the case of subdiabetic
and mild diabetic models, the same dose showed reduction in BGL of 22.0% and 31.4% during GTT. The study also involves the
first use of laser-induced breakdown spectroscopy as a sensitive analytical tool to detect the elemental profile responsible
for the antidiabetic activity of aqueous extract of T. dioica fruits that exhibits the antidiabetic activity. High intensities of Ca, Mg, and Fe indicate large concentrations of these
elements in the extract, since according to Boltzmann’s distribution law, intensities are directly proportional to concentrations.
The higher concentrations of these glycemic elements, viz. Ca, Mg, and Fe, are responsible for the antidiabetic potential
of T. dioica as well as other plant already reported by our research group. 相似文献
988.
Venkatareddy Udumula Young Wan Ham Marina Y. Fosso Ka Yee Chan Ravi Rai Jianjun Zhang Jie Li Cheng-Wei Tom Chang 《Bioorganic & medicinal chemistry letters》2013,23(6):1671-1675
Aminoglycoside represents a class of versatile and broad spectrum antibacterial agents. In an effort to revive the antibacterial activity against aminoglycoside resistant bacteria, our laboratory has developed two new classes of aminoglycoside, pyranmycin and amphiphilic neomycin (NEOF004). The former resembles the traditional aminoglycoside, neomycin. The latter, albeit derived from neomycin, appears to exert antibacterial action via a different mode of action. In order to discern that these aminoglycoside derivatives have distinct antibacterial mode of action, RNA-binding affinity and fluorogenic dye were employed. These studies, together with our previous investigation, confirm that pyranmycin exhibit the traditional antibacterial mode of action of aminoglycosides by binding toward the bacterial rRNA. On the other hand, the amphiphilic neomycin, NEOF004 disrupts the bacterial cell wall. In a broader perspective, it verifies that structurally modified neomycin can exert different antibacterial mode of action leading to the revival of activity against aminoglycoside resistant bacteria. 相似文献
989.
K.K. Gadpandey C.D. Sharma S.A. Firdousi A.N. Rai K.M. Vyas 《Mycological Research》1996,100(10):1194-1196
990.