全文获取类型
收费全文 | 2787篇 |
免费 | 130篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 30篇 |
儿科学 | 118篇 |
妇产科学 | 63篇 |
基础医学 | 316篇 |
口腔科学 | 114篇 |
临床医学 | 167篇 |
内科学 | 593篇 |
皮肤病学 | 91篇 |
神经病学 | 121篇 |
特种医学 | 108篇 |
外科学 | 359篇 |
综合类 | 128篇 |
一般理论 | 2篇 |
预防医学 | 208篇 |
眼科学 | 58篇 |
药学 | 200篇 |
中国医学 | 13篇 |
肿瘤学 | 245篇 |
出版年
2023年 | 22篇 |
2022年 | 69篇 |
2021年 | 115篇 |
2020年 | 55篇 |
2019年 | 62篇 |
2018年 | 95篇 |
2017年 | 73篇 |
2016年 | 84篇 |
2015年 | 85篇 |
2014年 | 107篇 |
2013年 | 133篇 |
2012年 | 199篇 |
2011年 | 195篇 |
2010年 | 99篇 |
2009年 | 84篇 |
2008年 | 165篇 |
2007年 | 148篇 |
2006年 | 135篇 |
2005年 | 136篇 |
2004年 | 100篇 |
2003年 | 70篇 |
2002年 | 84篇 |
2001年 | 51篇 |
2000年 | 55篇 |
1999年 | 44篇 |
1998年 | 19篇 |
1997年 | 11篇 |
1996年 | 17篇 |
1995年 | 19篇 |
1994年 | 16篇 |
1993年 | 8篇 |
1992年 | 24篇 |
1991年 | 18篇 |
1990年 | 28篇 |
1989年 | 21篇 |
1988年 | 28篇 |
1987年 | 20篇 |
1986年 | 16篇 |
1985年 | 15篇 |
1984年 | 18篇 |
1983年 | 12篇 |
1982年 | 7篇 |
1981年 | 10篇 |
1979年 | 11篇 |
1978年 | 7篇 |
1976年 | 9篇 |
1973年 | 9篇 |
1972年 | 7篇 |
1971年 | 7篇 |
1941年 | 6篇 |
排序方式: 共有2934条查询结果,搜索用时 46 毫秒
1.
2.
3.
L. C. Scott G. K. Wright G. S. Rai A. N. Exton-Smith J. M. Gardiner 《International journal of geriatric psychiatry》1991,6(8):583-588
Memory performance of elderly patients in the early stages of Alzheimer's disease (DAT) was compared with that of elderly control subjects. In explicit tests of recognition memory, which involve conscious recollection, the DAT patients were grossly impaired. In implicit tests of anagram solution and wordstem completion, which do not require conscious recollection, the DAT patients were not impaired. These findings further support the idea that a separate memory system, episodic memory, underlies conscious recollection, that it is this system which is most commonly damaged in amnesia, and that memory systems not involving conscious recollection may be spared in the early stages of Alzheimer's disease. 相似文献
4.
Restriction maps of the rDNA cistron of twelve species of mosquitoes in six genera of the subfamily Culicinae were constructed using eight 6 bp recognition restriction enzymes. Anopheles albimanus was used as an outgroup. The size of the rDNA cistron ranged from 8.5 kb in Aedes katherinensis to 12.9 kb in Ae. polynesiensis. A total of twenty-six sites were scored; eighteen were polymorphic among ingroup taxa. The proportion of polymorphic nucleotide sites (Pnuc) was 0.059 and the heterozygosity per nucleotide site (Hnuc) was 0.028. Wagner and Fitch Parsimony, Dollo Parsimony and Nei-Li distance/neighbour-joining methods were used to construct phylogenetic trees. The rDNA RFLP dataset did not provide a well-supported phylogeny among culicine taxa. The RFLP phylogenies are incongruent with the morphology character based and molecular phylogenies and derived relationships did not correspond with current taxonomic classifications. The lack of resolution was due to homoplasy arising from frequent independent loss or gain of restriction sites among unrelated taxa. 相似文献
5.
Sandeep Nijhawan Mukul Rastogi Ashish Joshi Atul Shende Manish Tandon Dinesh Singla Amit Mathur Subhash Nepalia Ramesh Roop Rai 《Digestive endoscopy》2007,19(2):80-82
Background: Ingestion of coins is a common clinical problem in children. Many of the coins are ferromagnetic and can be retrieved with the help of a magnet. We describe the use of a novel endoscopic accessory for removing ferromagnetic coins. Material and methods: Two magnet discs of 1.5 cm diameter were joined to a 200 cm steel wire of 0.75 mm thickness with a terminal 5 cm spring. A Teflon tube (160 cm, 7 F) was used along with this instrument as a sleeve. The use of this accessory was analyzed prospectively in subjects presenting with a history of coin ingestion. The time taken for removal of coins, complications during the procedure and failure rate was noted. Effect of the magnet on cardiac rhythm was also noted during the procedure. Results: A total of 55 children (mean age 5.1 ± 2.3 years) with coin ingestion presented over a period of 1 year. Forty‐four coins were ferromagnetic. All ferromagnetic coins were removed successfully. Mean time for removal was 68 ± 22 s. No complications were encountered. Conclusion: The novel magnetic instrument is precise, safe and quick for the removal of ferromagnetic coins under direct vision. 相似文献
6.
Manish Gupta Neena Chaudhary A. K. Rai 《Indian journal of otolaryngology and head and neck surgery》2007,59(2):160-162
Teratomas are true neoplasms composed of tissues from all three germinal layers and may exhibit variable levels of maturity. They have an unknown origin and eccentric microscopic appearance. Teratomas arising from the oral cavity are rare in the newborn; only 22 cases have been reported in the literature. We describe a female neonate with an oral teratoma originating from the tongue that was successfully treated with surgery. 相似文献
7.
The hypoglycaemic effect of Anthocleista vogelii was studied in mice, rats and rabbits. Aqueous extract of the plant obtained by infusion from finely pulverized root was used. The extract (100, 400 and 800 mg/kg) induced significant hypoglycaemic activity in a dose-related fashion at 2 h after oral administration in mice and rats with ED25 of 250 mg/kg and 350 mg/kg respectively. The extract (800 mg/kg, orally) similarly induced statistically significant lowering of blood glucose levels at 8 h in normoglycaemic rabbits. The extract (400 mg/kg and 800 mg/kg, orally) also caused reduction of blood glucose levels in alloxan-induced diabetic animals. The results of this study indicate that the aqueous extract of the roots of Anthocleista vogelii possess favourable hypoglycaemic activity both in normo and hyperglycaemic animals compared to chlorpropamide as a standard. 相似文献
8.
Selective inactivation of viruses in the presence of human platelets: UV sensitization with psoralen derivatives.
下载免费PDF全文
![点击此处可从《Proceedings of the National Academy of Sciences of the United States of America》网站下载免费的PDF全文](/ch/ext_images/free.gif)
R P Goodrich N R Yerram B H Tay-Goodrich P Forster M S Platz C Kasturi S C Park N J Aebischer S Rai L Kulaga 《Proceedings of the National Academy of Sciences of the United States of America》1994,91(12):5552-5556
Inactivation of viruses in blood products requires that the method employed display selectivity in its action for viral elements while not affecting the biological entity of interest. Several methods have been developed for the treatment of human plasma or products derived from human plasma. An effective technique for the treatment of the cellular components of blood has been lacking, in part due to the inability to develop agents capable of selectively targeting viral agents in the milieu of cellular material. In this paper, we examine the behavior of a group of viral sensitizers designed to be added to cellular samples and be activated upon exposure to UVA light. Upon activation, these agents are capable of disrupting nucleic acids of the virus in a manner that renders them inactive for proliferation. The selectivity observed in this inactivation is determined by the chemical structure of the sensitizer, which can be varied to increase viral killing capacity while diminishing collateral damage to cellular and protein constituents. 相似文献
9.
Nitin Anand A. K. Rai 《Indian journal of otolaryngology and head and neck surgery》2007,59(2):151-153
Despite the complex embryological development of the nose and surrounding structures, significant developmental nasal anomalies are rare. Of the various anomalies like-nasopharyngeal cysts, hairy polyps, dermoids, haemangiomata, fibromas, mucocoeles, lipoma, aplasias. We are presenting a rare case of Heterotopic Brain Tissue in the nasopharynx. This 1.5-month-old patient was operated through transpalatal route and mass excised. Histopathologicaly it consisted of various central nervous tissue elements. Seven months post surgery patient is thriving well. 相似文献
10.