全文获取类型
收费全文 | 25736篇 |
免费 | 1284篇 |
国内免费 | 81篇 |
专业分类
耳鼻咽喉 | 342篇 |
儿科学 | 1449篇 |
妇产科学 | 654篇 |
基础医学 | 2865篇 |
口腔科学 | 584篇 |
临床医学 | 1522篇 |
内科学 | 5376篇 |
皮肤病学 | 787篇 |
神经病学 | 1600篇 |
特种医学 | 797篇 |
外科学 | 3258篇 |
综合类 | 782篇 |
一般理论 | 19篇 |
预防医学 | 1298篇 |
眼科学 | 1420篇 |
药学 | 2334篇 |
中国医学 | 181篇 |
肿瘤学 | 1833篇 |
出版年
2023年 | 189篇 |
2022年 | 452篇 |
2021年 | 911篇 |
2020年 | 461篇 |
2019年 | 591篇 |
2018年 | 757篇 |
2017年 | 517篇 |
2016年 | 650篇 |
2015年 | 610篇 |
2014年 | 972篇 |
2013年 | 1190篇 |
2012年 | 1677篇 |
2011年 | 1797篇 |
2010年 | 963篇 |
2009年 | 800篇 |
2008年 | 1236篇 |
2007年 | 1282篇 |
2006年 | 1277篇 |
2005年 | 1091篇 |
2004年 | 997篇 |
2003年 | 851篇 |
2002年 | 794篇 |
2001年 | 705篇 |
2000年 | 704篇 |
1999年 | 559篇 |
1998年 | 235篇 |
1997年 | 171篇 |
1996年 | 148篇 |
1995年 | 150篇 |
1994年 | 114篇 |
1993年 | 99篇 |
1992年 | 369篇 |
1991年 | 370篇 |
1990年 | 339篇 |
1989年 | 329篇 |
1988年 | 285篇 |
1987年 | 251篇 |
1986年 | 234篇 |
1985年 | 232篇 |
1984年 | 171篇 |
1983年 | 135篇 |
1981年 | 91篇 |
1979年 | 157篇 |
1978年 | 97篇 |
1977年 | 81篇 |
1975年 | 83篇 |
1974年 | 100篇 |
1973年 | 92篇 |
1972年 | 118篇 |
1970年 | 78篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
S Sharma R Narula R Nath S K Thind 《Journal of nutritional science and vitaminology》1990,36(6):579-586
The intestinal uptake of [14C]oxalate, [14C]glyoxylate, and [14C]glycolate are studied in brush border membrane vesicles (BBMV) isolated from vitamin A-deficient and pair-fed control rats. The data obtained indicate that oxalate and its precursors are transported across the BBMV by passive diffusion. The intestinal uptake of glyoxylate and glycolate remains unaltered in vitamin A deficiency, while uptake rate of oxalate was significantly increased (p less than 0.01) in vitamin A-deficient rats as compared to pair-fed controls. In conclusion, the results indicate that vitamin A deficiency leads to hyperabsorption of oxalate through the gut. 相似文献
22.
Spontaneous gall bladder perforation in infants is rare. We report a 3-month-old male infant who presented with progressive abdominal distension, low-grade fever, bilateral hydrocele and acholic stools. Ultrasonography showed free fluid in the peritoneal cavity, which was bile-stained on paracentesis. Surgical exploration revealed sterile biliary peritonitis and a gangrenous gall bladder. Partial cholecystectomy with external biliary drainage resulted in satisfactory recovery. 相似文献
23.
24.
Primary intraorbital meningioma and Schwannoma are rare tumours. For them to occur concurrently, or one following soon after another should be considered a curiosity. We present a 40 year old male who reported with proptosis of the right eye and a meningioma was removed surgically. Within 3 months symptoms recurred and a schwannoma was removed at surgery from the same site. Interesting features of the lesion are presented and discussed. 相似文献
25.
26.
Subodh Varshney Sandesh Sharma Viniyendra Pamecha Ajit Sewkani Lalish Jhawar Vinod Narkhede Virendra Tewari Kailash Patel 《Indian journal of gastroenterology》2003,22(3):91-93
INTRODUCTION: Radiofrequency (RF) tissue ablation has been tried safely and effectively in the West as percutaneous local tissue ablation therapy. We present our experience with this technique in malignant lesions. METHODS: RF tumor ablation was done using an RF generator (Berchtold; Germany) generating 35-50 RF watts of power output. The RF needle was placed in the tumor under image guidance (n = 22) or at open surgery (n = 1). Around 1500 watts/cm3 RF energy was delivered to the tumor. Over 21 months, 23 patients underwent the procedure for 73 lesions, including metastatic liver lesions (n = 21) and locally advanced inoperable carcinoma of pancreas (n = 2). RESULTS: All lesions less than 3 cm in size (n = 15) and 39% of lesions 3-4 cm in size (17/44) had complete necrosis. Residual tumor was seen in 27/44 lesions (61%) 3-4 cm in size and in all 14 lesions more than 4 cm in size. There was no mortality or major morbidity. There were two minor complications (ascites 1, pleural effusion 1). Of 21 patients treated for liver metastases, 10 are still alive (6-month survival 19/21 [90%] and 12-month survival 11/17 [64.7%]). Only 2 of 32 (6.2%) lesions with complete necrosis had local recurrence. CONCLUSION: RF tumor ablation is a safe and effective local tissue ablative method in Indian patients. 相似文献
27.
28.
A. R. Mridha M. C. Sharma C. Sarkar V. Suri A. Rishi A. Garg A. Suri 《Child's nervous system》2007,23(10):1209-1213
Introduction Myxopapillary ependymomas are low grade tumours that are known to recur locally even after complete excision, but metastasis
to distant sites is extremely uncommon.
Case report We report an unusual case of lumbo-sacral myxopapillary ependymoma in a 13-year-old boy with metastasis to both cerebellopontine
angles. To the best of our knowledge, this is the youngest patient of metastatic myxopapillary ependymoma. 相似文献
29.
30.
Neerja Sharma 《Early child development and care》1990,58(1):71-79
The infant is the youngest but perhaps the most valuable member of society. It has been unequivocally established through research that the period up to two years is the most potent for forming and establishing the basis of later development. This paper summarizes the findings of two research studies on infant care in India that began in July 1988 and culminated in March 1989 under my guidance. The two studies are linked in their final implications for infant stimulation and in their role in providing insights into changing trends in infant-care in India.
In study I patterns of infant caregiving practiced by fathers were investigated. Study II looked into infant-care practices in Punjabi families where the grandmother lived with the young parents. 相似文献
In study I patterns of infant caregiving practiced by fathers were investigated. Study II looked into infant-care practices in Punjabi families where the grandmother lived with the young parents. 相似文献