Acquired cystic kidney disease (ACKD) can be developed duringchronic renal insufficiency. The probability of developing cysticdiseases rises with the increase of time in dialysis [1]. Menand African-American population are more likely to develop ACKD.Also, kidney volumes are bigger and cyst size increases fasterin this population [1,2]. Typical complications of ACKD areintra- and pericystic bleeding as well as rupture with retroperitonealhaemorrhage. Patients with ACKD also present a higher risk ofmalignant transformation. Haemoperitoneum is an unusual complicationin patients undergoing peritoneal dialysis (PD), most casesbeing attributed to mechanical, gynaecological or intraperitoneal  相似文献   
88.
Long-term survival after vinblastine, bleomycin, and cisplatin treatment in patients with germ cell tumors of the ovary: An update     
P. H. B. Willemse  J. G. Aalders  J. Bouma  N. H. Mulder  R. C. J. Verschueren  E. G. E. de Vries  D. Th. Sleijfer 《Gynecologic oncology》1987,28(3):268-277
Thirteen patients with a malignant germ cell tumor of the ovary have been treated with a combination of vinblastine, bleomycin, and cisplatin (VBP). In 12 patients a complete remission was reached, which was maintained in 10 of these patients. One patient with large tumor residues and a partial remission became CR after surgery. The tumor recurred in 2 patients after 6 and 27 months. Overall, 11 of these patients are in long-term remission, from 14 to 84 months after the start of treatment. VBP is an effective treatment for malignant germ cell tumors of the ovary, even in patients with large tumor residuals.  相似文献   
89.
Labially displaced ectopically erupting maxillary permanent canine: interceptive treatment and long-term results.     
Heloísio de Rezende Leite  Guilherme Silvério de Oliveira  Hélio Henrique de Araújo Brito 《American journal of orthodontics and dentofacial orthopedics》2005,128(2):241-251
This case report demonstrates how extracting a maxillary deciduous canine affects the eruption path of a labially displaced ectopically erupting permanent canine. A long-term follow-up is presented, and the biologic mechanisms are discussed.  相似文献   
90.
[首页] « 上一页 [4] [5] [6] [7] [8] 9 [10] [11] [12] [13] [14] 下一页 » 末  页»
  首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   350857篇
  免费   11313篇
  国内免费   461篇
耳鼻咽喉   3511篇
儿科学   12304篇
妇产科学   6743篇
基础医学   40476篇
口腔科学   9727篇
临床医学   25121篇
内科学   70263篇
皮肤病学   5223篇
神经病学   31014篇
特种医学   14318篇
外国民族医学   26篇
外科学   50240篇
综合类   3720篇
现状与发展   1篇
一般理论   65篇
预防医学   36151篇
眼科学   5979篇
药学   20270篇
中国医学   1386篇
肿瘤学   26093篇
  2023年   961篇
  2022年   2071篇
  2021年   3939篇
  2020年   2585篇
  2019年   3738篇
  2018年   26452篇
  2017年   20703篇
  2016年   22556篇
  2015年   5073篇
  2014年   6531篇
  2013年   8030篇
  2012年   17983篇
  2011年   32275篇
  2010年   24483篇
  2009年   16656篇
  2008年   28104篇
  2007年   30791篇
  2006年   9498篇
  2005年   11400篇
  2004年   12054篇
  2003年   12213篇
  2002年   8369篇
  2001年   5497篇
  2000年   5640篇
  1999年   4764篇
  1998年   1826篇
  1997年   1546篇
  1996年   1413篇
  1995年   1229篇
  1994年   1209篇
  1993年   1084篇
  1992年   2798篇
  1991年   2755篇
  1990年   2564篇
  1989年   2517篇
  1988年   2245篇
  1987年   2073篇
  1986年   1911篇
  1985年   1845篇
  1984年   1322篇
  1983年   1058篇
  1982年   614篇
  1981年   524篇
  1980年   550篇
  1979年   942篇
  1978年   638篇
  1975年   578篇
  1974年   596篇
  1973年   574篇
  1970年   494篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
82.
Haemangiomas are the most common tumours of infancy. They typically proliferate then involute with considerable variation as regards to their rates of proliferation and involution. Haemangioma of the nasal tip is a lesion of special characteristics. During proliferation, it expands, contracts and deviates the nasal cartilages. Particularly, it regresses slowly and frequently involutes incompletely. That is why excision of the lesion is frequently suggested. The present study was conducted to evaluate open rhinoplasty after initial non-excision treatment modalities namely, intra-lesional corticosteroid injections and laser treatment, as a protocol of treatment for nasal tip haemangiomas. Twelve patients with nasal tip haemangiomas were included in the present study. Patients of both sexes, of different ages, with deep and mixed haemangiomas were studied. Disfigurement was the constant presenting symptom. Initial non-excision treatment reported different responses as denoted by the regression of the lesions’ size. Haemangiomas constantly extended between the medial crura of the alar cartilages as noted by the constant widening of the columella pre-operatively and the obvious separation of the nasal cartilages intra-operatively. This separation was constantly found to require approximation by sutures. The results of the present study concluded that whenever an early presentation with nasal tip haemangioma could be established, initial non-excision treatment followed by open rhinoplasty could be a useful protocol of treatment. Within the limitations of the present study, this protocol could achieve an early, safe and effective treatment for nasal tip haemangiomas with provisionally acceptable cosmetic outcomes so far.  相似文献   
83.
This study investigates whether tissue recoil or patient intrinsic factors influence the final position of the nipple areola complex (NAC) after reduction mammoplasty. The age, pre-operative ptosis, BMI and weight of the tissue resected were recorded as patient intrinsic factors in 37 patients undergoing reduction mammoplasty. The “spring-back” value was defined as the distance from the sternal notch to a nipple landmark on the breast meridian with the patient sitting up, minus the same measurement repeated with the patient recumbent to eliminate the pull of gravity on the breast. Spring back was measured pre-operatively for the nipple and nipple mark then post-operative for the nipple. The difference in centimeters between the final post-operative distance from the sternal notch to the nipple and the level intended by the pre-operative nipple mark was termed the “judgment error.” The final position of the post-operative nipple and the judgment error was compared to the spring-back values and patient intrinsic factors. Pre-operative ptosis was statistically related to increasing patient BMI and mass of tissue resected per breast. Pre-operative spring-back values for the nipple increased with increasing ptosis, BMI and decreasing age. Spring-back values were greater in the lower pole of the breast than in the upper pole. The final position of the nipple was higher than the pre-operative mark in 65% of cases, lower in 8% and as marked in 27% of cases. The post-operative NAC was, on average, 0.6 cm higher than planned pre-operatively. The post-operative distance from the sternal notch to the nipple increased with increasing pre-operative ptosis, mass of breast tissue resected per breast and all three spring-back values. The difference between the level of the pre-operative mark and the final nipple position showed a weak correlation with post-operative spring-back values. The parameters of ptosis, BMI, weight of tissue resected per breast and pre-operative nipple spring back reflect body habitus and breast size. Spring-back values vary between the upper and lower pole of the breast. The final NAC position was higher than that intended at pre-operative marking in the majority of cases. The surgeon instinctively marks the nipple lower in patients with greater pre-operative ptosis and in whom a larger resection is anticipated. Judgment error did not relate to intrinsic factors nor to pre-operative spring-back values; hence, these parameters cannot be applied as predictive tools for more accurate pre-operative marking of the nipple position. This study suggests that the pre-operative nipple mark should be placed, with the patient sitting up, at least 23 cm from the sternal notch and 0.6 cm lower than the final position estimated using the inframammary crease as a landmark. An invited commentary on this paper is available at .  相似文献   
84.
85.
Conclusions  Noninvasive imaging of neurohumoral upregulation in remodeled myocardium suggests that an imaging strategy can be developed for predicting the rate of remodeling and likelihood of HF development. This should allow a more judicious use of neurohumoral antagonists especially in subjects who do not have manifest HF.74 In others specific targeted imaging may allow timely selection of individualized treatment strategies and ensure optimization of therapeutic intervention. Similar to ACE and AII receptors, multiple other targets in the hormonal cascades can identify the likelihood of adverse and favorable remodeling.74  相似文献   
86.
Familial 46,XX gonadal dysgenesis   总被引:1,自引:0,他引:1  
Two sisters, ages 18 and 25, presented with primary amenorrhea and underwent clinical, hormonal, cytogenetic, and pathologic evaluation. Both were of normal stature and lacking of somatic stigmata. Both patients had normal 46,XX karyotype on peripheral blood. Streak gonads were seen in both patients and a rather scanty number of primordial follicles was found in one patient. FSH, LH, and urinary estrogens were consistent with streak gonad syndrome. Autosomal recessive inheritance has been suggested in familial aggregates with XX gonadal dysgenesis.  相似文献   
87.
   Introduction
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号