全文获取类型
收费全文 | 50581篇 |
免费 | 4776篇 |
国内免费 | 1050篇 |
专业分类
耳鼻咽喉 | 425篇 |
儿科学 | 1197篇 |
妇产科学 | 1242篇 |
基础医学 | 7669篇 |
口腔科学 | 1453篇 |
临床医学 | 5039篇 |
内科学 | 9639篇 |
皮肤病学 | 890篇 |
神经病学 | 4464篇 |
特种医学 | 1675篇 |
外国民族医学 | 2篇 |
外科学 | 6604篇 |
综合类 | 2879篇 |
一般理论 | 25篇 |
预防医学 | 3913篇 |
眼科学 | 897篇 |
药学 | 4563篇 |
中国医学 | 424篇 |
肿瘤学 | 3407篇 |
出版年
2022年 | 276篇 |
2021年 | 650篇 |
2020年 | 407篇 |
2019年 | 638篇 |
2018年 | 955篇 |
2017年 | 731篇 |
2016年 | 772篇 |
2015年 | 911篇 |
2014年 | 1180篇 |
2013年 | 1617篇 |
2012年 | 2251篇 |
2011年 | 2279篇 |
2010年 | 1374篇 |
2009年 | 1220篇 |
2008年 | 2003篇 |
2007年 | 2277篇 |
2006年 | 2071篇 |
2005年 | 1773篇 |
2004年 | 1750篇 |
2003年 | 1608篇 |
2002年 | 1444篇 |
2001年 | 2979篇 |
2000年 | 2873篇 |
1999年 | 2426篇 |
1998年 | 905篇 |
1997年 | 681篇 |
1996年 | 512篇 |
1995年 | 481篇 |
1994年 | 402篇 |
1993年 | 394篇 |
1992年 | 1510篇 |
1991年 | 1384篇 |
1990年 | 1226篇 |
1989年 | 1408篇 |
1988年 | 1225篇 |
1987年 | 1125篇 |
1986年 | 1124篇 |
1985年 | 959篇 |
1984年 | 681篇 |
1983年 | 633篇 |
1982年 | 352篇 |
1981年 | 299篇 |
1980年 | 244篇 |
1979年 | 443篇 |
1978年 | 265篇 |
1977年 | 239篇 |
1974年 | 236篇 |
1973年 | 274篇 |
1972年 | 244篇 |
1971年 | 254篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
71.
Internal Hernias: Clinical Findings,Management, and Outcomes in 49 Nonbariatric Cases 总被引:1,自引:0,他引:1
Saber Ghiassi Scott Q. Nguyen Celia M. Divino John C. Byrn Avraham Schlager 《Journal of gastrointestinal surgery》2007,11(3):291-295
Internal hernia, the protrusion of a viscus through a peritoneal or mesenteric aperture, is a rare cause of small bowel obstruction.
We report the clinical presentation, surgical management, and outcomes of one of the largest series of nonbariatric internal
hernias. Ten-year retrospective review of patients at our institution yielded 49 cases of internal hernias. Majority of patients
presented with symptoms of acute (75%) or intermittent (22%) small bowel obstruction. While 16% of CT scans were suspicious
for internal hernia, in no cases the preoperative diagnosis of internal hernia was made. The most frequent internal hernias
were transmesenteric (57.0%) and 34 hernias (69%) were caused by previous surgery. All internal hernias were reduced and the
defects were repaired. Compromised bowel was present in 22 cases and 11 patients underwent small bowel resection. The mean
postoperative hospitalization was 10.9 days. The overall mortality rate from our series is 2%, and the morbidity rate is 12%.
Transmesenteric hernias, as complications of previous surgeries, are the most prevalent internal hernias. Preoperative diagnosis
of internal hernia is extremely difficult because of the nonspecific clinical presentation. However, if discovered promptly,
internal hernias can be repaired with acceptable morbidity and mortality.
Poster presentation at Digestive Disease Week, May 22, 2006, Los Angeles, California, USA. 相似文献
72.
73.
Nutritional supplementation, psychosocial stimulation, and growth of stunted children: the Jamaican study 总被引:3,自引:0,他引:3
S P Walker C A Powell S M Grantham-McGregor J H Himes S M Chang 《The American journal of clinical nutrition》1991,54(4):642-648
The benefits of nutritional supplementation, with or without psychosocial stimulation, on the growth of stunted children were evaluated. Children aged 9-24 mo with lengths less than -2 SD of the National Center for Health Statistics references (n = 129) were randomly assigned to four groups: control, nutritional supplementation, stimulation, and both interventions. A fifth group with lengths greater than -1 SD was also enrolled. Length, weight, head and arm circumferences, and triceps and subscapular skinfold thicknesses were measured on enrollment and 6 and 12 mo later. Multiple-regression analysis was used to determine the effects of the interventions in which age, sex, initial status, initial dietary intake, and several socioeconomic variables were controlled for. Stimulation had no effect on growth and there was no interaction between the interventions. After 12 mo supplemented children had significantly increased length, weight, and head circumference (all P less than 0.01). The effects of supplementation were not cumulative but occurred in the first 6 mo. 相似文献
74.
This paper reports the morphometric analysis results of 100 cases of bladder tumor cells with a Q-900 computer-assisted image analysis system. According to the nuclear area, axis ratio and area ratio of tumor nuclei, bladder transitional cell tumors were divided into 4 grades. This system is called the morphometric grading system (M grading). The results show that the higher the M grading, the lower the survival rate and the higher the recurrence rate. As the M grade increases the tumors could be accompanied by muscular invasion. When recurring, the tumor has a poor prognosis if M grading increases. We conclude that the morphometric grading system is able to yield a quantitative pathologic diagnosis and can predict the biological behavior of bladder tumors. Recently, new techniques for diagnosing and predicting the biological behavior of bladder tumors have been developed. One such technique is morphometric analysis of bladder transitional cell carcinoma with computer-assisted image instruments [1]. Because this morphometric method is easily applicable to pathological section routinely stained with HE and the results are reproducible and more objective, the studies about morphometric analysis of bladder tumor have increased in recent times. This paper reports the preliminary morphometric analysis results of bladder tumor cells examined by a Q-900 image analysis instrument for 100 cases. 相似文献
75.
76.
J P Murphy A V Adyanthaya P R Adams J D McArthur W E Walker 《The Annals of thoracic surgery》1987,43(3):323-325
Pulmonary artery aneurysms are rare lesions for which operative management is not frequently undertaken. When operation is indicated, central lesions involving the pulmonary trunk, right main pulmonary artery, or left main pulmonary artery are repaired using cardiopulmonary bypass. Peripheral aneurysms in segmental intrapulmonary arteries have been managed most frequently by lobectomy, but occasionally by aneurysmectomy and pulmonary arterial repair. We used cardiopulmonary bypass for peripheral pulmonary aneurysmectomy in a patient with limited respiratory reserve because he had undergone prior contralateral bilobectomy; this allowed controlled resection while preserving a maximal amount of pulmonary parenchyma. 相似文献
77.
78.
Toxocariasis: a serological survey of blood donors in the Australian Capital Territory together with observations on the risks of infection 总被引:4,自引:0,他引:4
W L Nicholas A C Stewart J C Walker 《Transactions of the Royal Society of Tropical Medicine and Hygiene》1986,80(2):217-221
The sera from 660 healthy blood donors from Canberra were tested for antibodies to Toxocara canis by the ELISA test. The results were compared with those from patients with suspected or confirmed visceral larva migrans or ocular toxocariasis. Over 7% of Canberra sera showed elevated levels of antibody reacting with T. canis antigen. Sera from patients resident in Australia with other helminth parasites did not cross-react with T. canis antigen in our tests. However, studies of sera collected in several tropical countries with other parasitic infection, show that cross-reactions with other parasites are possible. The use of purified glycoprotein antigen does not alter the possibility of cross-reaction. Observations and experiments show that people in Canberra may be exposed to the infective eggs of T. canis. 相似文献
79.
Lee L. Q. Pu 《European journal of plastic surgery》2007,30(1):19-24
A soleus flap as a local reconstructive option for soft-tissue coverage of a tibial wound in the distal third of the leg has
never been well recognized. In a 2-year period, seven patients underwent reconstruction of a less extensive tibial wound (4 × 3
to 10 × 4 cm) in the distal third of the leg after orthopedic trauma with the laterally extended medial hemisoleus flap. The
flap was elevated with emphasis on the preservation of the most distal perforators from the posterior tibial vessels to the
flap as possible while allowing adequate rotation of the flap to cover the exposed tibia and/or hardware and on the possible
preservation of foot planter flexion by reconstruction of the proximal Achilles’ tendon. In this series, there was no total
or partial flap loss. All patients healed their tibial wounds primarily with reliable soft-tissue coverage, evidenced fracture
healing, and good cosmetic outcome during follow-up. Thus, the laterally extended medial hemisoleus flap described by the
author can be a reliable option for soft-tissue coverage of a less extensive tibial wound in the distal third of the leg.
It offers a more cost-effective approach for managing this unique problem and can be performed by most reconstructive surgeons
without microsurgical expertise. 相似文献
80.
V S Jeganathan S Walker 《European journal of vascular and endovascular surgery》2005,30(3):332-3; author reply 333-4