全文获取类型
收费全文 | 16560篇 |
免费 | 838篇 |
国内免费 | 195篇 |
专业分类
耳鼻咽喉 | 191篇 |
儿科学 | 462篇 |
妇产科学 | 213篇 |
基础医学 | 2446篇 |
口腔科学 | 409篇 |
临床医学 | 1567篇 |
内科学 | 3262篇 |
皮肤病学 | 601篇 |
神经病学 | 1210篇 |
特种医学 | 1022篇 |
外科学 | 2151篇 |
综合类 | 99篇 |
一般理论 | 2篇 |
预防医学 | 729篇 |
眼科学 | 395篇 |
药学 | 1414篇 |
2篇 | |
中国医学 | 187篇 |
肿瘤学 | 1231篇 |
出版年
2023年 | 106篇 |
2022年 | 325篇 |
2021年 | 523篇 |
2020年 | 293篇 |
2019年 | 375篇 |
2018年 | 434篇 |
2017年 | 364篇 |
2016年 | 510篇 |
2015年 | 686篇 |
2014年 | 799篇 |
2013年 | 881篇 |
2012年 | 1342篇 |
2011年 | 1220篇 |
2010年 | 816篇 |
2009年 | 714篇 |
2008年 | 887篇 |
2007年 | 948篇 |
2006年 | 790篇 |
2005年 | 724篇 |
2004年 | 579篇 |
2003年 | 465篇 |
2002年 | 445篇 |
2001年 | 346篇 |
2000年 | 322篇 |
1999年 | 247篇 |
1998年 | 200篇 |
1997年 | 216篇 |
1996年 | 170篇 |
1995年 | 162篇 |
1994年 | 142篇 |
1993年 | 118篇 |
1992年 | 112篇 |
1991年 | 104篇 |
1990年 | 119篇 |
1989年 | 123篇 |
1988年 | 110篇 |
1987年 | 90篇 |
1986年 | 99篇 |
1985年 | 90篇 |
1984年 | 56篇 |
1983年 | 48篇 |
1982年 | 39篇 |
1981年 | 53篇 |
1980年 | 44篇 |
1979年 | 41篇 |
1978年 | 52篇 |
1977年 | 43篇 |
1976年 | 45篇 |
1975年 | 44篇 |
1974年 | 27篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
Intraspinal air: a CT finding of epidural abscess 总被引:2,自引:0,他引:2
23.
24.
25.
Georgios Amoiridis Ludwig Gutmann Dennis E. Wilkins Raja Sawaya Alain Lagueny Roger Marthan Philippe Schuermans Philippe Le Collen Xavier Ferrer Jean Julien Reha Kuruoglu Shin J. Oh Brian Thompson A. Aggarwal L. Gutmann A. Gutierrez Okifumi Nakazato Russel Johnsen Philip Morling B. A. Kakulas 《Muscle & nerve》1994,17(2):245-253
26.
Ralls PW; Johnson MB; Kanel G; Dobalian DM; Colletti PM; Boswell WD Jr; Radin DR; Halls JM 《Radiology》1986,161(2):451-454
FM sonography - a signal-processing technique that uses frequency and phase information as well as amplitude data - shows promise in evaluation of patients with diffuse liver disease. In a prospective blinded review of 37 patients with biopsy-proved liver disease and 42 healthy volunteers, FM sonography was clearly superior to traditional amplitude-based (AM) sonography in distinguishing healthy from diseased subjects. Statistically significant differences were seen in accuracy (FM, 98.7%; AM, 84.8%), sensitivity (FM, 97.3%; AM, 70.3%), and negative predictive value (FM, 97.7%; AM, 78.8%). Our data also suggest that current FM sonographic techniques cannot differentiate among histologic findings associated with different hepatic parenchymal abnormalities. It is unclear, therefore, whether FM imaging can reduce the numbers of patients who require biopsy for diagnosis or the frequency of biopsy procedures in patients with known disease. 相似文献
27.
Effect of meal on the physiological and physicochemical actions of potassium citrate 总被引:1,自引:0,他引:1
The effect of meals on the physiological and physicochemical actions of potassium citrate was examined in 8 patients with nephrolithiasis maintained on a constant metabolic dietary regimen. Potassium citrate (20 mEq. 3 times per day), whether given with food or on an empty stomach, significantly increased urinary pH, citrate and potassium, and decreased urinary calcium and ammonium. Moreover, potassium citrate decreased urinary saturation of calcium oxalate and uric acid, although it slightly increased that of brushite. However, there was no significant difference in these measures when the drug was given with meals from the time when it was given on an empty stomach. Thus, the effect of potassium citrate on urinary risk factors is unaffected by food. 相似文献
28.
V M Oh 《International dental journal》1991,41(6):348-358
Elderly persons are apt to receive multiple drugs for many diseases. Prescribers should take extra care in persons aged over 65-70 years, and especially the very old. The main problem of the elderly is the unpredictability of their response to drugs. Self-medication with both prescribed and over-the-counter drugs worsens this problem. Drug actions may be altered by impairment of the liver, kidneys and brain, or acute illness, or both. Unwanted (adverse) drug reactions often produce rapid and unduly severe illness in the old. Some antibacterial antibiotics like the sulphonamides are best avoided. Taking many drugs together promotes adverse interactions between the drugs. Drugs with a narrow therapeutic ratio, such as warfarin, digoxin, the aminoglycosides, and many antiarrhythmic drugs, cause clinical problems. Old persons respond more abruptly to drugs like benzodiazepines, opioid analgesics, and antiparkinsonian drugs. Anaesthesia given on top of psychotropic drugs may damage the central nervous system. The elderly brain is more sensitive to induction agents and short-acting intravenous anaesthetics, like alfentanil and midazolam; the elderly liver is more easily damaged by inhalational anaesthetics like halothane. The overall benefit:risk ratio should be judged for every drug in each patient. Wherever possible, drug treatment should be avoided. If drugs are given, safe drugs with broad therapeutic ratios and tissue- or receptor-specific actions are preferable. Drug doses are usually, but not always, reduced. Benefit from a drug should be assessed early. Severe unpredictable adverse reactions need immediate cessation of the drug and prompt patient support. The practitioner should frequently review the patient's continuing need for drugs. 相似文献
29.
H D Lee C O Suh W H Jung K K Oh H B Park H S Chi B R Kim J S Min 《Yonsei medical journal》1992,33(3):272-276
This is the first preliminary report among two consecutive papers. Partial mastectomy(PM), axillary lymph node dissection(AD) and radiotherapy (RT) were performed on seventeen operable breast cancer patients who had been admitted from April 1991 to March 1992 to the department of surgery, Yongdong Severance Hospital for improved cosmetic appearance and better survival rate. Of seventeen patients, 47% were T1 lesion and 76% were stage I and II. Extensive intraductal component(EIC) within or around the tumor was also analyzed. Twenty nine per cent of the patients were EIC positive. The mean number of axillary lymph nodes was 21.5 after PM with AD and 20.5 after mastectomy. For radiotherapy, 4,500 rad was delivered to the breast parenchyma and 1,600 rad of boost to the primary tumor site using the electron beam method after surgery. All patients have since been living well without any local recurrence and were satisfied with breast preservation for the one-year follow-up period. We concluded that the PM, AD and RT can be another surgical treatment modality of breast cancer. A longer follow-up data will be followed on the second paper. 相似文献
30.
Pernes JM; Vitoux JF; Brenoit P; Raynaud A; Parola JL; Roth JP; Angel CY; Fiessinger JN; Roncato M; Gaux JC 《Radiology》1986,158(2):481-485
Thirty-five patients hospitalized for recent angiographically documented arterial occlusion in the legs (27 femoropopliteal arteries and eight grafts) benefited from local fibrinolytic therapy delivered at the site of the occlusion with a 4- or 5-F catheter. This therapy combined a continuous urokinase (UK) infusion of 1,000 U/kg/hour and a lysyl plasminogen (LYS-PLG) infusion of 15 microkatals every 30 minutes. Angiographically confirmed lysis was obtained in 85% of the cases. Only 3% of the patients had major and 6% had minor groin hematomas. Only two patients had concentrations of fibrinogen as low as 100 mg/dl. Intravascular infusion of UK-LYS-PLG is as effective as streptokinase. Its excellent tolerance makes it a good alternative in the treatment of acute ischemia in the lower limbs. 相似文献