全文获取类型
收费全文 | 3596篇 |
免费 | 232篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 37篇 |
儿科学 | 169篇 |
妇产科学 | 62篇 |
基础医学 | 457篇 |
口腔科学 | 269篇 |
临床医学 | 236篇 |
内科学 | 503篇 |
皮肤病学 | 68篇 |
神经病学 | 146篇 |
特种医学 | 73篇 |
外科学 | 693篇 |
综合类 | 64篇 |
一般理论 | 4篇 |
预防医学 | 164篇 |
眼科学 | 102篇 |
药学 | 460篇 |
中国医学 | 35篇 |
肿瘤学 | 290篇 |
出版年
2023年 | 29篇 |
2022年 | 79篇 |
2021年 | 147篇 |
2020年 | 97篇 |
2019年 | 109篇 |
2018年 | 143篇 |
2017年 | 108篇 |
2016年 | 122篇 |
2015年 | 132篇 |
2014年 | 160篇 |
2013年 | 220篇 |
2012年 | 325篇 |
2011年 | 320篇 |
2010年 | 152篇 |
2009年 | 143篇 |
2008年 | 189篇 |
2007年 | 175篇 |
2006年 | 131篇 |
2005年 | 94篇 |
2004年 | 91篇 |
2003年 | 70篇 |
2002年 | 72篇 |
2001年 | 60篇 |
2000年 | 46篇 |
1999年 | 42篇 |
1998年 | 15篇 |
1997年 | 11篇 |
1996年 | 18篇 |
1995年 | 14篇 |
1992年 | 44篇 |
1991年 | 37篇 |
1990年 | 33篇 |
1989年 | 42篇 |
1988年 | 23篇 |
1987年 | 36篇 |
1986年 | 24篇 |
1985年 | 20篇 |
1984年 | 22篇 |
1983年 | 23篇 |
1981年 | 15篇 |
1980年 | 10篇 |
1979年 | 15篇 |
1977年 | 15篇 |
1976年 | 14篇 |
1975年 | 14篇 |
1974年 | 24篇 |
1973年 | 13篇 |
1972年 | 11篇 |
1970年 | 9篇 |
1967年 | 9篇 |
排序方式: 共有3832条查询结果,搜索用时 15 毫秒
71.
72.
Shivsharan
M. Mali Parag P. Chavan Yuvraj H. Navale Vikas B. Patil Bhaskar R. Sathe 《RSC advances》2018,8(20):11177
Herein, we focused on the one pot synthesis of ZnO nanoplates (NP edge thickness of ∼100 nm) using a chemical emulsion approach for chemical (direct) and electrochemical (indirect) determination of NO2. The structural and morphological elucidation of the as-synthesized ZnO NPs was carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive analysis of X-ray (EDAX), thermogravimetric analysis (TGA) and BET-surface area measurements. The XRD studies of the as-synthesised NPs reveal that ZnO NPs have a Wurtzite type crystal structure with a crystallite size of ∼100 nm. Such ZnO NPs were found to be highly sensitive to NO2 gas at an operating temperature of 200 °C. Electrocatalytic abilities of these ZnO NPs towards NO2/NO2− were verified through cyclic voltammetry (CV) and linear sweep voltammetry (LSV) using aqueous 1 mM NO2− (nitrite) in phosphate buffer (pH 7) solution. The results revealed enhanced activity at an onset potential of 0.60 V vs. RCE, achieved at a current density of 0.14 mA cm−2. These ZnO NPs show selective NO2 detection in the presence of other reactive species including CO, SO2, CH3OH and Cl2. These obtained results show that this chemical route is a low cost and promising method for ZnO NPs synthesis and recommend further exploration into its applicability towards tunable electrochemical as well as solid state gas sensing of other toxic gases.Herein, we focused on the one pot synthesis of ZnO nanoplates (NP edge thickness of ∼100 nm) using a chemical emulsion approach for chemical (direct) and electrochemical (indirect) determination of NO2. 相似文献
73.
Wenjun Kang Sabah Kadri Rutika Puranik Michelle N. Wurst Sushant A. Patil Ibro Mujacic Sonia Benhamed Nifang Niu Chao Jie Zhen Bekim Ameti Bradley C. Long Filipo Galbo David Montes Crystal Iracheta Venessa L. Gamboa Daisy Lopez Michael Yourshaw Carolyn A. Lawrence Jeremy P. Segal 《The Journal of molecular diagnostics : JMD》2018,20(4):522-532
74.
Patil S. L. Loganandhan N. Ramesha M. N. Adhikary Partha Pratim Channabasappa K. 《Proceedings of the National Academy of Sciences, India. Section B.》2018,88(2):685-694
Proceedings of the National Academy of Sciences, India Section B: Biological Sciences - In-situ rainwater conservation improves chickpea productivity in Vertisols. This hypothesis was tested by... 相似文献
75.
Stoner Marie C. D. Bhushan Nivedita L. Maragh-Bass Allysha C. Mitchell John T. Riggins Linda Walker Maleka LeMasters Katherine Reese Bianka Dearing Aissa Debnam Summer Golin Carol Lightfoot Alexandra F. Pettifor Audrey 《AIDS and behavior》2022,26(5):1672-1683
AIDS and Behavior - Adolescents and young adults (AYA; 13–24 years-old) comprise 22% of new HIV infections in the United States (US), most of whom live in the South. We used the... 相似文献
76.
Graham Peigh MD Jeremiah Wasserlauf MD MS Kelly Vogel BS Rachel M. Kaplan MD MS Anna Pfenniger MD PhD Daniel Marks MD Arjun Mehta MD Alexandru B. Chicos MD Rishi Arora MD Susan Kim MD Albert Lin MD Nishant Verma MD MPH Kaustubha D. Patil MD Bradley P. Knight MD Rod S. Passman MD MSCE 《Journal of cardiovascular electrophysiology》2021,32(8):2097-2104
77.
Summary 4-Methylphenylhydrazine hydrochloride was administered as 10 weekly subcutaneous injections of 140 g/g body weight and as 7 weekly intragastric instillations of 250 g/g body weight in physiological saline to randomly bred Swiss mice. Treatments given subcutaneously resulted in induction of lung tumors in incidences of 36% in females and 44% in males, while intragastric treatment caused a 40% incidence in females. In addition, it gave rise to blood vessel tumors by intragastric route in incidences of 32% in females and 18% in males. In the two physiological saline-treated control groups, the lung tumor incidence (combined) was 20% in females and 21% in males, while the blood vessel tumor incidence (combined) was 7% in females and 6% in males. Histopathologically, the lesions were classified as adenomas and adenocarcinomas of the lungs, and angiomas and angiosarcomas of blood vessels.4-Methylphenylhydrazine was postulated to be a metabolite of 4-hydroxymethylphenylhydrazine, an ingredient of the commonly eaten mushroom Agaricus bisporus. The implications are discussed with respect to the tumorigenesis data.This study was supported by Public Health Service Contract NOl CP33278 from the National Cancer Institute, NIH, USA 相似文献
78.
H L Komiskey J F Bossart D D Miller P N Patil 《Proceedings of the National Academy of Sciences of the United States of America》1978,75(6):2641-2643
Tritiated dopamine was used to label the dopamine receptor in membranes isolated from the rat corpus striatum. Scatchard analysis of displacement of [3H]dopamine by nonradioactive dopamine indicated the presence of two binding sites. The similarities in affinity, capacity, and drug specificity of the high-affinity site in the striatal membranes from rat and the binding site in the membranes from the calf caudate nucleus suggest that [3H]dopamine labels the same site in both species. In order to determine what conformation of dopamine is preferred at the dopamine receptor site, conformationally restricted analogs of dopamine--namely, the cis and trans 2-amino-1(3,4-dihydroxyphenyl)cyclobutane hydrochlorides--were tested for their affinity to the receptor. Compared to the cis conformation, the trans-restricted analogs had more affinity for the receptor site, indicating that dopamine probably interacts with the receptor in the trans conformation. 相似文献
79.
80.
Bhushan B. Kulkarni Shivaprakash V. Hiremath Suyamindra S. Kulkarni Umesh R. Hallikeri Basavaraj R. Patil Pramod B. Gai 《Journal of virological methods》2013
The identification of the etiology of breast cancer is a crucial research issue for the development of an effective preventive and treatment strategies. Researchers are exploring the possible involvement of Mouse Mammary Tumor Virus (MMTV) in causing human breast cancer. Hence, it becomes very important to use a consistent positive control agent in PCR amplification based detection of MMTV-Like Sequence (MMTV-LS) in human breast cancer for accurate and reproducible results. This study was done to investigate the feasibility of using genomic DNA of MCF-7 breast cancer cells to detect MMTV-LS using PCR amplification based detection. MMTV env and SAG gene located at the 3′ long terminal repeat (LTR) sequences were targeted for the PCR based detection. No amplification was observed in case of the genomic DNA of MCF-7 breast cancer cells. However, the 2.7 kb DNA fragment comprising MMTV env and SAG LTR sequences yielded the products of desired size. From these results it can be concluded that Genomic DNA of MCF-7 cell is not a suitable choice as positive control for PCR or RT-PCR based detection of MMTV-LS. It is also suggested that plasmids containing the cloned genes or sequences of MMTV be used as positive control for detection of MMTV-LS. 相似文献