全文获取类型
收费全文 | 3960篇 |
免费 | 292篇 |
国内免费 | 23篇 |
专业分类
耳鼻咽喉 | 35篇 |
儿科学 | 276篇 |
妇产科学 | 109篇 |
基础医学 | 423篇 |
口腔科学 | 25篇 |
临床医学 | 404篇 |
内科学 | 1109篇 |
皮肤病学 | 34篇 |
神经病学 | 182篇 |
特种医学 | 358篇 |
外科学 | 506篇 |
综合类 | 78篇 |
预防医学 | 175篇 |
眼科学 | 141篇 |
药学 | 156篇 |
中国医学 | 1篇 |
肿瘤学 | 263篇 |
出版年
2021年 | 42篇 |
2019年 | 39篇 |
2018年 | 43篇 |
2016年 | 42篇 |
2015年 | 37篇 |
2014年 | 48篇 |
2013年 | 87篇 |
2012年 | 114篇 |
2011年 | 105篇 |
2010年 | 78篇 |
2009年 | 74篇 |
2008年 | 117篇 |
2007年 | 126篇 |
2006年 | 106篇 |
2005年 | 107篇 |
2004年 | 112篇 |
2003年 | 107篇 |
2002年 | 89篇 |
2001年 | 78篇 |
2000年 | 100篇 |
1999年 | 98篇 |
1998年 | 82篇 |
1997年 | 73篇 |
1996年 | 66篇 |
1995年 | 50篇 |
1994年 | 66篇 |
1993年 | 57篇 |
1992年 | 111篇 |
1991年 | 122篇 |
1990年 | 124篇 |
1989年 | 133篇 |
1988年 | 157篇 |
1987年 | 125篇 |
1986年 | 115篇 |
1985年 | 109篇 |
1984年 | 109篇 |
1983年 | 73篇 |
1982年 | 46篇 |
1981年 | 62篇 |
1980年 | 36篇 |
1979年 | 75篇 |
1978年 | 73篇 |
1977年 | 62篇 |
1976年 | 67篇 |
1975年 | 54篇 |
1974年 | 59篇 |
1973年 | 57篇 |
1972年 | 52篇 |
1971年 | 41篇 |
1969年 | 31篇 |
排序方式: 共有4275条查询结果,搜索用时 15 毫秒
1.
2.
3.
Prostatitis accounts for almost 2 million office visits to urologists and primary care physicians. The label “prostatitis” refers to a diverse constellation of symptoms and disease processes. The diagnosis and treatment of this disorder present numerous challenges for the physician, including a lack of abnormal findings on physical examination, laboratory tests, and radiographic images. In this article, we offer a review of the current literature and recommendations for the evaluation and diagnosis of the patient presenting with prostatitis. 相似文献
4.
Zakiya Al-Lamki Eileen Thomas Nagwa El-Banna Norman Jaffe 《Pediatric blood & cancer》1995,24(2):137-140
We report an unusual case of anaphylaxis and hepatitic dysfunction in a child with the administration of the twenty-third course of high-dose methotrexate. The latter had been used as an adjuvant to prevent pulmonary metastases and the prior 22 courses had been well tolerated. An attempt to reinstate methotrexate after the twenty-third course was again followed by a similar reaction. © 1995 Wiley-Liss, Inc. 相似文献
5.
C A Jaffe B Ocampo-Lim W Guo K Krueger I Sugahara R DeMott-Friberg M Bermann A L Barkan 《The Journal of clinical investigation》1998,102(1):153-164
Sexually dimorphic growth hormone (GH) secretory pattern is important in the determination of gender-specific patterns of growth and metabolism in rats. Whether GH secretion in humans is also sexually dimorphic and the neuroendocrine mechanisms governing this potential difference are not fully established. We have compared pulsatile GH secretion profiles in young men and women in the baseline state and during a continuous intravenous infusion of recombinant human insulin-like growth factor I (rhIGF-I). During the baseline study, men had large nocturnal GH pulses and relatively small pulses during the rest of the day. In contrast, women had more continuous GH secretion and more frequent GH pulses that were of more uniform size. The infusion of rhIGF-I (10 microg/kg/h) potently suppressed both spontaneous and growth hormone-releasing hormone (GHRH)-induced GH secretion in men. In women, however, rhIGF-I had less effect on pulsatile GH secretion and did not suppress the GH response to GHRH. These data demonstrate the existence of sexual dimorphism in the regulatory mechanisms involved in GH secretion in humans. The persistence of GH responses to GHRH in women suggests that negative feedback by IGF-I might be expressed, in part, through suppression of hypothalamic GHRH. 相似文献
6.
Limited posterolateral surgical approach to the knee for excision of osteoid osteoma 总被引:1,自引:0,他引:1
An 18-year-old man suffered four years of undiagnosed knee pain until a CAT scan revealed an epiphyseal osteoid osteoma of the tibia located subchondrally, just medial to the proximal tibiofibular joint. A nidus in this location is not easily accessible, and its proximity to the joint surface raised concerns about damage to the tibial plateau. To facilitate excision of the tumor, cadaveric dissections were performed to develop a limited posterior approach to the proximal, lateral portion of the tibia. The CAT scan was used to calculate the precise dimensions of the tumor and its relation to the posterior tibial cortex and the proximal tibiofibular joint. With the use of the exposure developed in the laboratory and the calculations derived from the CAT scan, the tumor could be excised by removing a single block of bone 15 mm3. Intraoperative radiographs confirmed the presence of the nidus within the excised block of bone. This case report reaffirms the frequent difficulties and tardiness in diagnosing osteoid osteomas and the need to include these tumors in the differential diagnosis of knee pain and epiphyseal lesions. Before CAT scans were used, the working diagnoses were torn meniscus, juvenile rheumatoid arthritis, and bone hemangiomatosis. 相似文献
7.
N Jaffe 《The American journal of pediatric hematology/oncology》1987,9(1):62-67
Advances in the treatment of childhood cancer have produced dramatic changes in survival. Unfortunately, many of the advances associated with this improvement have been accompanied by delayed sequelae induced by treatments such as surgery, radiotherapy, and chemotherapy. This article reviews published reports of treatment sequelae and examines their impact on the design of current forms of treatment. Recognition of the delayed effects of these treatment modalities has resulted in alterations in established therapies. This alteration is an ongoing process and demonstrates the concern of physicians with improving quality of life for long-term survivors of childhood cancer. 相似文献
8.
9.
10.
Pharmacokinetics of fluvastatin after single and multiple doses in normal volunteers. 总被引:4,自引:0,他引:4
The pharmacokinetics of fluvastatin, a potent inhibitor of hydroxymethylglutaryl-CoA reductase and thus cholesterol synthesis, have been studied in 24 normal male volunteers who received [3H] fluvastatin in three different studies: a single-dose study using oral doses of 2 or 10 mg, an absolute bioavailability study using doses of 2 mg intravenously or 10 mg orally, and a multiple-dose study using 40 mg orally once daily for 6 days. Serial blood and plasma samples and complete urine and feces were collected and analyzed for total radioactivity as well as for intact fluvastatin. Fluvastatin was rapidly and almost completely (greater than 90%) absorbed from the gastrointestinal tract, although the estimated bioavailability from the 2- and 10-mg doses was only 19 to 29% because of extensive first-pass metabolism. Fluvastatin pharmacokinetics appeared to be linear over the 2- to 10-mg dose range, as indicated by dose-proportional blood levels of total radioactivity and the parent drug. Absorbed fluvastatin was completely metabolized before excretion, the biliary/fecal route being the major excretory pathway. The recovery of radioactivity after a single dose was virtually complete within 120 hours. The terminal half-lives of fluvastatin and total radioactivity averaged 0.5 to 1 hour and 55 to 71 hours, respectively, whereas the total body clearance of fluvastatin was 0.97 L/hour/kg. Repeated oral administration of 40-mg doses of [3H]fluvastatin resulted in no time-related change in pharmacokinetic characteristics, but this dose yielded greater than proportional increases in circulating levels of the parent drug, thus suggesting a saturable first-pass effect on fluvastatin.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献