全文获取类型
收费全文 | 2781篇 |
免费 | 202篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 17篇 |
儿科学 | 122篇 |
妇产科学 | 54篇 |
基础医学 | 490篇 |
口腔科学 | 45篇 |
临床医学 | 208篇 |
内科学 | 535篇 |
皮肤病学 | 55篇 |
神经病学 | 144篇 |
特种医学 | 139篇 |
外科学 | 155篇 |
综合类 | 151篇 |
一般理论 | 1篇 |
预防医学 | 319篇 |
眼科学 | 64篇 |
药学 | 256篇 |
中国医学 | 23篇 |
肿瘤学 | 214篇 |
出版年
2023年 | 33篇 |
2022年 | 60篇 |
2021年 | 130篇 |
2020年 | 52篇 |
2019年 | 79篇 |
2018年 | 66篇 |
2017年 | 68篇 |
2016年 | 79篇 |
2015年 | 81篇 |
2014年 | 125篇 |
2013年 | 146篇 |
2012年 | 187篇 |
2011年 | 194篇 |
2010年 | 124篇 |
2009年 | 89篇 |
2008年 | 161篇 |
2007年 | 118篇 |
2006年 | 106篇 |
2005年 | 113篇 |
2004年 | 110篇 |
2003年 | 118篇 |
2002年 | 83篇 |
2001年 | 53篇 |
2000年 | 57篇 |
1999年 | 55篇 |
1998年 | 29篇 |
1997年 | 21篇 |
1996年 | 14篇 |
1995年 | 14篇 |
1994年 | 11篇 |
1993年 | 14篇 |
1992年 | 30篇 |
1991年 | 41篇 |
1990年 | 38篇 |
1989年 | 33篇 |
1988年 | 26篇 |
1987年 | 40篇 |
1986年 | 26篇 |
1985年 | 22篇 |
1984年 | 19篇 |
1983年 | 10篇 |
1982年 | 10篇 |
1981年 | 8篇 |
1980年 | 9篇 |
1979年 | 20篇 |
1978年 | 6篇 |
1977年 | 7篇 |
1976年 | 7篇 |
1970年 | 5篇 |
1969年 | 5篇 |
排序方式: 共有2992条查询结果,搜索用时 0 毫秒
1.
Dinesh Singhal Nandini Vasdev Arvinder Soin Subash Gupta Samiran Nundy 《Indian journal of gastroenterology》2006,25(4):206-207
It is difficult to distinguish between carcinoid tumors of the pancreatic head and periampullary region and carcinomas preoperatively. Between 1996 and 2002, 125 consecutive pancreaticoduodenectomies done by us for periampullary tumors (14 carcinoids, 111 carcinomas) were analyzed. Patients with carcinoid tumors had significantly younger mean age (48 vs. 54 years), longer history (32 vs. 8 weeks), lower serum total bilirubin levels (1.4 vs. 6.3 mg/dL) and on CT scan, had larger, well-localized tumors (5 cm vs. 2 cm). Their postoperative course was better with no mortality or major morbidity, whereas after resection for carcinoma 7 (6.3%) patients died and 30 (27%) had major postoperative complications. Thus, a tumor of this region in a young patient with indolent history, low bilirubin level and with CT scan depicting a large expansile lesion suggests a carcinoid. Such tumors may be safely resected with low postoperative morbidity and mortality and good long-term prognosis. 相似文献
2.
Chakraborty Bhaswat S. Sardessai Manik S. Jaworski Theodore J. Midha Kamal K. Hawes Edward M. 《Pharmaceutical research》1987,4(3):207-213
For the separate development of radioimmunoassay procedures for thioridazine and its two major active metabolites, mesoridazine and sulforidazine, three haptens, respectively, 2-methylthio-, 2-methylsulfinyl-, and 2-methylsulfonyl-substituted 10-[2-[l-(2-carboxyethyl)-2-piperidinyl]ethyl]-10H-phenothiazine, were synthesized and characterized. Thioridazine hapten was coupled to bovine serum albumin, whereas the haptens for mesoridazine and sulforidazine were coupled to porcine thyroglobulin. The number of hapten residues per mole of carrier protein was determined in each case by an ultraviolet spectrophotometric method. Polyclonal antibodies to each hapten–protein conjugate were obtained in rabbits, and titers of the antisera were checked by evaluating their binding characteristics to the appropriate tritiated analyte. A hapten for the ring sulfoxide metabolite of thioridazine was also synthesized. 相似文献
3.
4.
Short term effect of diltiazem on portal hypertension in patients with non-cirrhotic portal fibrosis
S Banerjee S S Banerjee S Chakraborty P Mukherjee 《Indian journal of gastroenterology》1991,10(1):7-9
Fourteen patients of non-cirrhotic portal fibrosis (NCPF) with portal hypertension were put on oral diltiazem hydrochloride (90 mg/day) or placebo on a prospective, randomised, single blind basis for 15 days. Predrug hemodynamic and biochemical status were similar in both groups. Diltiazem produced significant reduction (p less than 0.001) in mean intrasplenic pressure: from 41.88 (SD +/- 6.18) to 21.5 (+/- 7.91) cm of normal saline as against 45.56 (+/- 9.45) to 43.33 (+/- 8.27) in the placebo group. Mean arterial pressure (MAP), heart rate and cardiac output (CO) did not change in either group. Thus, the calcium channel blocker diltiazem reduces portal pressure in patients with NCPF, independent of reduction in MAP and CO; this is advantageous in situations where compromised cardiac hemodynamics may prove deleterious. 相似文献
5.
Abhishek Srivastava Anirban Ghosh Somnath Saha V. P. Saha Debdulal Chakraborty 《Indian journal of otolaryngology and head and neck surgery》2007,59(4):322-326
38 cases of sarcoma of head and neck region were analysed in a retrospective way in relation to age, anatomic location, histological,
clinical profile, and surgical approaches. Compared to other types of head and neck neoplasms, such as squamous cell carcinoma,
soft tissue sarcomas have low rates of regional metastases. However the biological behaviour of soft tissue sarcoma is more
aggressive specially in paediatric age group. In the present series, CT scan was considered as the primary modality of investigation.
Surgery generally has been recommended as the primary method of treatment for achieving local control, except in those high-grade
tumours arising in sites not amenable to resection. 3-year and 5-year survival rates in this present series 50% and 31.6%
respectively. 相似文献
6.
7.
8.
9.
10.
V Fauveau B Wojtyniak M A Koenig J Chakraborty A I Chowdhury 《International journal of epidemiology》1989,18(1):139-145
A total of 542 women aged 15 to 44 years died during the 10-year period 1976 to 1985 in the control area of Matlab, an area with a population of 90,000, representative of many other rural areas of southern Bangladesh. The corresponding age-specific mortality rate was 290 per 100,000 women 15-44 years. These deaths have been analysed retrospectively, using information collected through the Demographic Surveillance System set up by the International Centre for Diarrhoeal Disease Research, Bangladesh (ICDDR,B) and verbal autopsies conducted in the homes. Of these deaths, 175 (32%) were due to infectious diseases, 163 (30%) to direct obstetric complications, 67 (12%) to injuries, and the remaining 26% to other causes. Cause-specific and proportionate mortality rates showed a positive association with age for deaths due to infectious diseases, non-infectious diseases and unspecified causes, and an inverse association with age for deaths due to injuries. These rates showed a peak in the intermediate age group 25 to 34 years for deaths due to direct obstetric causes. No consistent trends were visible when annual rates were studied over time. Prior to death, 42% of the women were attended by traditional practitioners, and 33% were not attended at all. Demographic impact is discussed, emphasizing the contribution of obstetric causes to overall mortality. Priorities for health policy implications are proposed, focusing upon a strong maternity care programme, and improved availability of female health personnel, in the context of the socio-cultural constraints imposed on women in poor rural areas. 相似文献