全文获取类型
收费全文 | 242563篇 |
免费 | 20497篇 |
国内免费 | 14393篇 |
专业分类
耳鼻咽喉 | 2175篇 |
儿科学 | 3082篇 |
妇产科学 | 4885篇 |
基础医学 | 28340篇 |
口腔科学 | 4247篇 |
临床医学 | 30895篇 |
内科学 | 39923篇 |
皮肤病学 | 2842篇 |
神经病学 | 13557篇 |
特种医学 | 8744篇 |
外国民族医学 | 96篇 |
外科学 | 26672篇 |
综合类 | 34096篇 |
现状与发展 | 48篇 |
一般理论 | 45篇 |
预防医学 | 15115篇 |
眼科学 | 6676篇 |
药学 | 24205篇 |
164篇 | |
中国医学 | 10890篇 |
肿瘤学 | 20756篇 |
出版年
2024年 | 700篇 |
2023年 | 3491篇 |
2022年 | 8681篇 |
2021年 | 11395篇 |
2020年 | 8380篇 |
2019年 | 7548篇 |
2018年 | 7993篇 |
2017年 | 6971篇 |
2016年 | 6670篇 |
2015年 | 10092篇 |
2014年 | 12698篇 |
2013年 | 11886篇 |
2012年 | 17530篇 |
2011年 | 19216篇 |
2010年 | 11729篇 |
2009年 | 9393篇 |
2008年 | 12771篇 |
2007年 | 12808篇 |
2006年 | 12370篇 |
2005年 | 12443篇 |
2004年 | 8607篇 |
2003年 | 7643篇 |
2002年 | 6609篇 |
2001年 | 5998篇 |
2000年 | 6112篇 |
1999年 | 6419篇 |
1998年 | 3686篇 |
1997年 | 3711篇 |
1996年 | 2828篇 |
1995年 | 2614篇 |
1994年 | 2251篇 |
1993年 | 1527篇 |
1992年 | 2308篇 |
1991年 | 2010篇 |
1990年 | 1677篇 |
1989年 | 1477篇 |
1988年 | 1292篇 |
1987年 | 1220篇 |
1986年 | 966篇 |
1985年 | 764篇 |
1984年 | 499篇 |
1983年 | 393篇 |
1982年 | 239篇 |
1981年 | 221篇 |
1980年 | 208篇 |
1979年 | 251篇 |
1978年 | 147篇 |
1977年 | 121篇 |
1976年 | 118篇 |
1974年 | 117篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
961.
LIAN Fang was born in Rongcheng City Shandong Province in September .In December she received her bachelor''''s degree.She has been engaged in clinical practice scientific research teaching at the Department of Gynecology the Affiliated Hospital of Shandong University of Traditional Chinese Medicine.…… 《中国结合医学杂志》2007,13(3):231-232
LIAN Fang,was born in Rongcheng City,Shandong Province in September 1957. In December 1982,she received her bachelor's degree. She has been engaged in clinical practice,scientific research and teaching at the Department of Gynecology,the Affiliated Hospital of Shandong University of Traditional Chinese Medicine.During this period,she received her master's degree from the Department of Gynecology of Integrated Chinese and Western Medicine in Nanjing 相似文献
962.
Hypertensive cerebral hemorrhage at the head of caudate nucleus 总被引:1,自引:0,他引:1
C Chen 《中华神经精神科杂志》1986,19(1):21-22
963.
Y Hirai S Kaku H Teshima J T Chen T Hamada I Fujimoto K Yamauchi K Hasumi K Masubuchi A Sakamoto 《Nippon Sanka Fujinka Gakkai zasshi》1987,39(11):2005-2010
Between 1950 and 1986, 14 cases of primary carcinoma of the fallopian tube were treated and diagnosed at the Cancer Institute Hospital. These cases constituted 0.13% of the total number of gynecologic malignancies at the hospital during the period. The clinical/pathological findings and prognoses were described. Of the 14 cases, the average age was 56.0 years. The most frequent symptom was atypical genital bleeding, seen in 11 cases (79%). Massive watery discharge was seen in four cases (29%). In preoperative cytologic examination of vaginal smears, six cases (43%) were positive for cancer. All cases underwent operation as therapy. Postoperative irradiation, adjuvant chemotherapy, and/or second-or third- look operation was also used. Histopathologically, all materials were found to be adenocarcinoma. Four cases were well differentiated, seven were moderately differentiated, and three were poorly differentiated. Two patients with stage III and IV cancers died of the disease. Nine patients were still alive at the end of this study. The five-year survival rate was 57% (4/7). In stage I cancers, the five-year survival rate was 80% (4/5). The prognosis of stage I cancer patients was estimated as rather good. 相似文献
964.
965.
Zhang Deli Chen Shulan 《宁夏医科大学学报》1987,(2)
Sinoatrial node electrogram (SNE) was recorded successfully in recent years, using transvenous electrode catheter. Via SNE and intratrialelectrogram (IEG), one could measure sinoatrial conduction time(SACT) directly, observe sinoatrial node (SN) potential changes in cadiac cycles, diagnose some sinus arrhythmias which couldn't be confirmed by surface ECG. All these could offer accurate evidence for differential diagnosis of sick sinus syndrome (SSS). The authors recommend a modified method for the location of the electrode catheter, by which one can increase success rate of obtaining stable SNE. Using this method, the authors recorded SNE in 10 cases with SSS successfully. 相似文献
966.
M F Shaio J G Chen F Y Chang 《The Southeast Asian journal of tropical medicine and public health》1987,18(4):539-546
To find out a simple, rapid, accurate, and reliable viability assay for in vitro anti-protozoa drug testing, a comparison among the various methods for the determination of flagellate viability was made. Micro-colony forming efficiency up to 90% for three different flagellates was obtained by the agar plate method. Macro-colony forming efficiency obtained by the culture tube method was generally lower (20-45%). Viability determined by trypan blue exclusion correlated closely with viability determined by micro-colony count (r = 0.94). The growth of the remaining parasites survived from serum treatment was not inhibited while that from metronidazole pretreatment was inhibited. The standard regrowth assay based on the 48-hr cultivation could be applied only for those survival not inhibited. The inhibitory effect of metronidazole on parasites was further testified by the longer generation time for metronidazole-pretreated flagellates in comparison with that for control (p less than 0.001). If the inhibitory effect of a drug is involved in the mechanisms against parasites, only the trypan blue exclusion and the micro-colony count can give an accurate and reliable viability determination. Moreover, the simple and rapid diagnosis provided by trypan blue exclusion is especially useful for the in vitro anti-protozoa drug susceptibility test. 相似文献
967.
本文报道了6例地中海贫血红细胞系列的超微结构改变,包括中、晚幼红细胞,网织红细胞及部份成熟红细胞的胞浆及胞核内可见电子密度较高的包涵体(α或β肽链的沉积);核膜有缺失或重叠,核周间隙扩大;各期红细胞中易见自噬泡和空泡形成;红细胞外形变化显著,发现有特征性的棒形红细胞。此外,还观察到红细胞在狭窄的脾窦中被扣押、挤压、破坏的现象。上述变化提供了地中海贫血发病机理的形态学证据 相似文献
968.
先前的研究表明血小板α_2受体变化表征交感神经突触前α_2受体的变化。为了解心衰病人血小板α_2受体功能状况,我们观察了10例Ⅲ、Ⅳ级心功能的心衰病人及10例配对正常人由肾上腺素诱导的血小板聚集率在α_2受体阻滞前后的变化。结果表明肾上腺素诱导的血小板聚集率在两组无显著性差异,但应用α_2阻滞剂Rauwolscine(0.25mg/L)后,0.25,0.5,1.0mg/L E诱导的心衰病人血小板聚集率显著低于对照组,提示血小板α_2受体在心衰时有数量的减少或(和)功能的降低,表征交感神经突触前NE释放的负反馈机制被抑制。 相似文献
969.
本实验建立心肌钙反常损伤模型,观察钙通道阻滞剂硫氮(艹卓)酮对心肌钙反常损伤的影响。发现硫氮(艹卓)酮能显著减轻心肌挛缩,提高冠脉流量和冠脉流出液中超氧化物歧化酶(SOD)活性,降低心肌细胞内的 CPK 释放及心室肌组织钙含量。实验结果表明,硫氮(艹卓)酮对心肌钙反常损伤有明显的保护作用。 相似文献
970.
不同浓度氢氟酸对大鼠血钙变化的影响 总被引:14,自引:0,他引:14
王定国 《中华整形烧伤外科杂志》1998,14(4):275-276
OBJECTIVE: To evaluate the effects of different concentration of hydrofluoric acid (HF) on local skin and calcium level of serum. METHODS: SD rats were divided into two groups which were wounded by 20% and 40% percent of HF respectively. Samples of blood and wound tissue were harvested at different postburn time for the analysis of the calcium level of the serum and histological study. RESULTS: It was found that twenty percent of HF was enough to cause a skin damage, and might bring about fatal hypocalcemia after a prolonged contact. High concentration of HF (40%) could cause deep tissue necrosis within a short time, and result in a fatal hypocalcemia within 24 hour even in the case of a small area injury. CONCLUSION: It is important to treat the patient with HF injury as early as possible. Sufficient calcium must be applied guided by laboratory study in order to prevent the fatal hypocalcemia. 相似文献