全文获取类型
收费全文 | 22586篇 |
免费 | 1464篇 |
国内免费 | 127篇 |
专业分类
耳鼻咽喉 | 288篇 |
儿科学 | 451篇 |
妇产科学 | 439篇 |
基础医学 | 3214篇 |
口腔科学 | 463篇 |
临床医学 | 2029篇 |
内科学 | 5224篇 |
皮肤病学 | 302篇 |
神经病学 | 2261篇 |
特种医学 | 904篇 |
外科学 | 2917篇 |
综合类 | 218篇 |
一般理论 | 47篇 |
预防医学 | 1828篇 |
眼科学 | 891篇 |
药学 | 1280篇 |
中国医学 | 31篇 |
肿瘤学 | 1390篇 |
出版年
2023年 | 83篇 |
2022年 | 183篇 |
2021年 | 426篇 |
2020年 | 245篇 |
2019年 | 357篇 |
2018年 | 455篇 |
2017年 | 341篇 |
2016年 | 391篇 |
2015年 | 440篇 |
2014年 | 650篇 |
2013年 | 880篇 |
2012年 | 1355篇 |
2011年 | 1499篇 |
2010年 | 826篇 |
2009年 | 788篇 |
2008年 | 1348篇 |
2007年 | 1417篇 |
2006年 | 1253篇 |
2005年 | 1344篇 |
2004年 | 1199篇 |
2003年 | 1142篇 |
2002年 | 1126篇 |
2001年 | 291篇 |
2000年 | 265篇 |
1999年 | 306篇 |
1998年 | 243篇 |
1997年 | 257篇 |
1996年 | 204篇 |
1995年 | 177篇 |
1994年 | 131篇 |
1993年 | 134篇 |
1992年 | 196篇 |
1991年 | 175篇 |
1990年 | 179篇 |
1989年 | 134篇 |
1988年 | 145篇 |
1987年 | 144篇 |
1986年 | 152篇 |
1985年 | 152篇 |
1984年 | 164篇 |
1983年 | 154篇 |
1982年 | 151篇 |
1981年 | 175篇 |
1980年 | 148篇 |
1979年 | 125篇 |
1978年 | 111篇 |
1977年 | 106篇 |
1975年 | 114篇 |
1974年 | 102篇 |
1973年 | 122篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Christopher R. Newton Margaret T. Hearn Albert A. Yuzpe Manon Houle 《Journal of assisted reproduction and genetics》1992,9(1):24-31
The purpose of this investigation was to identify in vitro fertilization (IVF) candidates' motives for parenthood and hence for seeking treatment. The relationship among identified motives, pretreatment emotional adjustment, and reaction to treatment failure was then examined. Women as a group placed greatest emphasis on fulfilling gender-role requirements, and those strongly endorsing such motives showed the poorest adjustment before IVF and the most negative reaction to first-cycle failure. In contrast, men in general were more likely to stress a desire for marital completion, although this motive was not predictive of emotional status before or after IVF. However, men experiencing social pressures to have children were at greater risk when treatment failed. The results indicate that greater consideration of cognitive factors may enhance understanding of emotional reactions to IVF failure and provide important insights for therapeutic intervention. 相似文献
992.
Dr. Albert P. Rocchini Jon N. Meliones Robert H. Beekman Catherine Moorehead Manette London 《Pediatric cardiology》1992,13(2):92-96
Summary Current therapy of congenital or acquired stenoses of the peripheral pulmonary arteries and superior vena cava are frequently ineffective. This report describes our initial experience with the use of a balloon-expandable stainless steel stent to treat experimentally created branch pulmonary artery and superior vena cava stenosis. Fifteen adult mongrel dogs had surgically created stenoses of either a branch pulmonary artery and/or superior vena cava. A balloon-expandable stainless steel (0.076 mm), 3 cm long, intravascular stent was used in all animals. Stents were successfully placed in 13 of 15 dogs (nine with branch pulmonary stenosis and four with superior vena caval stenosis) with hemodynamic and angiographic relief of the stenoses in all. In three animals, successful stent placement was not accomplished because the distal right pulmonary artery was found to be totally obstructed in two and in one dog with combined vena cava and pulmonary stenosis the distal right pulmonary artery was so severely stenotic that the stenosis could not be crossed. Repeat catheterization performed 6 months following stent placement documented persistent gradient relief and angiographic evidence of unobstructed flow through the stent without thrombus formation and with patent side branch vessels. Our preliminary results suggests that balloon-expandable stents are a potential therapy for the treatment of branch pulmonary artery and superior vena cava stenoses. 相似文献
993.
Martin M. Quigley Cecilia L. Schmidt Pedro J. Beauchamp Nabil F. Maklad Albert S. Berkowitz Don P. Wolf 《Journal of assisted reproduction and genetics》1985,2(1):11-16
A combination of clomiphene citrate and human menopausal gonadotropin was employed for enhanced follicular recruitment in an in vitro fertilization program. All patients received 50 mg of clomiphene and 1 ampule of human menopausal gonadotropin daily from cycle day 5 through cycle day 9. Follicular monitoring was begun on day 10 using a combination of ultrasound measurement of follicular size and number and determination of peripheral estradiol levels. Based on the size and number of follicles, the peirpheral levels of estradiol, and the rate of follicular growth and increase in estradiol, human menopausal gonadotropin was continued at a dosage of 1 to 3 ampules/day through the day of human chorionic gonadotropin administration. Human chorionic gonadotropin was administered on the evening of the day the largest follicle reached or exceeded 20 mm in mean diameter if the estradiol levels had been rapidly rising or reaching a plateau and had exceeded a minimal level of 300 pg/ml. Using this protocol, 30 of 33 patients underwent laparoscopy, 29 patients had successful oocyte recovery, and 23 patients underwent embryo replacement, with the establishment of six clinical pregnancies. 相似文献
994.
995.
996.
Rodrigo Martino Salut Brunet Anna Sureda Ramon Gu Rdia Anna AventiÍ N JesÚ S Soler Albert Alt S Andreu Domingo-Alb
S 《Leukemia & lymphoma》1996,20(3):321-326
Nineteen adults with primary refractory or relapsed acute leukemia (12 ALL and 7 ANLL) were treated with an intensive salvage chemotherapy (intermediate-dose ara-C, intermediate-dose methotrexate, vindesine, cyclophosphamide, mitoxantrone and prednisolone) followed by a hematopoietic growth factor (HGF), either granulocyte colony-stimulating factor (5 μg/kg) or granulocyte-macrophage colony-stimulating factor (10 μg/kg). Both were given from the day after chemotherapy ended and until the neutrophil count rose above 1 × 109/l for three consecutive days. Eleven patients (58%. 95% CI 33% to 82%) achieved complete remission, and 15 courses of salvage therapy were given to these complete responders. In a historical control group that did not receive HGF, 23 out of 38 patients (60%, 95% CI 44% to 77%) achieved complete remission, and 27 courses of therapy were delivered to complete responders. Treatment with a HGF accelerated the recovery of neutrophils to 0.5 × 109/l significantly, shortening it from a mean of 28 to 22 days (p = .0002), with no effect on platelet recovery. There were no differences in the rates of documented and fatal infections, which were relatively high in both groups. In the patients with ANLL, there was no evidence that HGF accelerated leukemic regrowth. We conclude that HGF accelerates neutrophilic recovery following intensive salvage chemotherapy for acute leukemia, although no reduction in documented infections was found. Many factors, including the small patient sample, may have contributed to this latter finding. 相似文献
997.
S Albert 《Pediatric clinics of North America》1987,34(1):61-73
Aminophylline therapy has undergone change in the past decade. With the changes in usage and dosage forms, the frequency of toxicity in the pediatric population, especially in adolescents, has increased dramatically. Two distinct patterns, chronic and acute, have been recognized and treatment methods for both are changing. Table 4 summarizes the emerging state-of-the-art therapy for aminophylline toxicity. Judging from the activity seen in the literature, investigation into aminophylline toxicity will continue to be a priority. We will see a greater understanding of the disease process and a refining of the therapeutic process. The ultimate goal is the elimination of mortality and the minimization of morbidity from aminophylline toxicity. 相似文献
998.
Pregnancy following induction of ovulation with pure FSH after suppression of endogenous gonadotropins with subcutaneous Buserelin 总被引:1,自引:0,他引:1
P. J. Albert J. Schläfke H. Kaesemann J. Gille 《Archives of gynecology and obstetrics》1987,241(1):53-56
Summary Ovarian stimulation in patients with disorders of ovulation or an inadequate luteal phase using human menopausal gonadotropins (hMG) gives a low pregnancy rate with a high incidence of overstimulation and a premature LH surge. In order to overcome these problems, a new approach has been used, namely prior suppression of endogenous gonadotropins with a gonadotropin-releasing-hormone analog (LHRH) and subsequent ovarian stimulation with hMG. We present a case of ovarian stimulation with pure FSH during suppression of endogenous gonadotropins with the LHRH analog Buserelin. A clinical pregnancy was achieved in the first treatment cycle and led us to conclude that follicular development does not depend on LH stimulation. This could be of substantial interest in IVF programs. 相似文献
999.
TEENAGE MOTHERING: CHILD DEVELOPMENT AT FIVE YEARS 总被引:1,自引:0,他引:1
Jane Wadsworth Brent Taylor Albert Osborn Neville Butler 《Journal of child psychology and psychiatry, and allied disciplines》1984,25(2):305-313
Developmental outcome at 5 yr was compared in 1031 singleton children of teenage mothers and 10,950 singleton children of older mothers in a national longitudinal study. Children born to teenage mothers and living with them through the first 5 yr performed less well than other children in tests of vocabulary and behaviour at 5 yr of age; they were also shorter on average and had a smaller head circumference. These differences remained significant after allowing for certain social and biological factors, whereas a difference on visuomotor coordination did not. Teenage mothering thus appears somewhat disadvantageous to children's development. 相似文献
1000.
J. Spranger C. Albert F. Schilling C. Bartsocas H. Stöss 《European journal of pediatrics》1983,140(1):34-40
Five patients are described with a hereditary arthropathy affecting major and minor joints. The main features of this progressive connective tissue disorder are restricted joint mobility, osseous swelling of the interphalangeal and other joints, and platyspondyly. The condition is commonly misdiagnosed as chronic juvenile polyrthritis with Scheuermann disease. It differs from the rheumatoid-factor-negative polyarticular form of rheumatoid arthritis and other rheumatoic spondylarthropathies by the absence of arthritic and other inflammatory changes, radiographically by the absence of destructive and the presence of dysplastic bone changes. The disorder does not seem to respond to the usual forms of antirheumatoid treatment. Histological studies showed a peculiar, nest-like clustering of chondrocytes in the resting and growth cartilage suggesting that pathogenetically this is a primary disorder of the articular cartilage.Supported by the Stiftung Volkswagenwerk 相似文献