全文获取类型
收费全文 | 940篇 |
免费 | 73篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 43篇 |
妇产科学 | 21篇 |
基础医学 | 88篇 |
口腔科学 | 12篇 |
临床医学 | 95篇 |
内科学 | 213篇 |
皮肤病学 | 9篇 |
神经病学 | 34篇 |
特种医学 | 141篇 |
外科学 | 73篇 |
综合类 | 27篇 |
预防医学 | 108篇 |
眼科学 | 69篇 |
药学 | 60篇 |
1篇 | |
肿瘤学 | 28篇 |
出版年
2021年 | 7篇 |
2018年 | 13篇 |
2017年 | 8篇 |
2016年 | 10篇 |
2014年 | 9篇 |
2013年 | 18篇 |
2012年 | 25篇 |
2011年 | 22篇 |
2010年 | 17篇 |
2009年 | 21篇 |
2008年 | 28篇 |
2007年 | 32篇 |
2006年 | 45篇 |
2005年 | 28篇 |
2004年 | 30篇 |
2003年 | 23篇 |
2002年 | 22篇 |
2001年 | 22篇 |
2000年 | 15篇 |
1999年 | 23篇 |
1998年 | 23篇 |
1997年 | 22篇 |
1996年 | 30篇 |
1995年 | 15篇 |
1994年 | 29篇 |
1993年 | 17篇 |
1992年 | 14篇 |
1991年 | 26篇 |
1990年 | 23篇 |
1989年 | 32篇 |
1988年 | 36篇 |
1987年 | 33篇 |
1986年 | 22篇 |
1985年 | 25篇 |
1984年 | 22篇 |
1983年 | 21篇 |
1982年 | 17篇 |
1981年 | 14篇 |
1980年 | 15篇 |
1979年 | 20篇 |
1978年 | 7篇 |
1977年 | 15篇 |
1976年 | 13篇 |
1975年 | 7篇 |
1974年 | 8篇 |
1973年 | 9篇 |
1972年 | 12篇 |
1971年 | 10篇 |
1970年 | 13篇 |
1967年 | 9篇 |
排序方式: 共有1023条查询结果,搜索用时 31 毫秒
1.
A primary intrascrotal mass clinically mimicking a testicular tumor was found to be a desmoid tumor originating from the spermatic cord. To our knowledge, this is the first reported case of a paratesticular desmoid tumor. 相似文献
2.
3.
M Glasser 《The Journal of family practice》1988,27(5):514-518
Because there is a 35 to 50 percent incidence of false-positive prediction of fetal compromise on fetal heart-rate monitoring patterns, many unnecessary cesarean sections are performed. To reduce the number of unnecessary cesarean sections, the physician is urged to consider the following: (1) fetal heart-rate monitoring is associated with higher rates of cesarean sections than in those not monitored; (2) only high-risk patients should be monitored provided the low-risk patient is at term, with a normal-sized infant, and does not convert to a high-risk patient while in labor; (3) maintenance of variability is a better predictor of absence of acidosis than is fetal scalp pH; (4) fetal scalp stimulation by firm digital pressure or gentle nontraumatic clamping of scalp tissue or acoustic stimulation obviates the need for fetal scalp pH confirmation of acidosis in 50 percent of cases; (5) monetary considerations may unconsciously lead to increased cesarean sections, since insurance companies remunerate at a higher level for those as compared with vaginal deliveries; and (6) more patients with prior cesarean section should be given a trial of labor, since the initial reason for cesarean section often is not a recurring one and many could successfully be delivered vaginally. Ultimately there is a risk inherent in any decision regarding method of delivery. The patient must understand this risk and share in the decision-making process as a knowledgeable person, aware of the limitation of her physician. 相似文献
4.
This research applied the life table technique to nursing personnel data in two types of hospitals to illustrate how administrators can examine patterns of continued employment. Although a large proportion of nurses were short-stay employees, the teaching hospital was found to have a higher retention rate than the community hospital corporation. The retention patterns are examined by personal and professional characteristics, as well as by reason for termination. Implications of our findings are discussed with respect to policy concerns related to hiring, retention, productivity, and staff development. 相似文献
5.
6.
Cysts of the seminal vesicles: diagnosis and management 总被引:1,自引:0,他引:1
7.
The late psychosocial consequences of childhood cancer 总被引:1,自引:0,他引:1
8.
进一步研究了抗三尖杉酯碱的HL-60细胞(HR20)抗细胞凋亡的机制及该抗性和抗药性的关系。结果表明,环孢菌素A(CsA)20,10μg·ml ̄(-1)诱导HL-60细胞发生凋亡,而阻断HR20细胞于G_1期,就不能诱导细胞发生凋亡。低浓度的CsA明显增加柔红霉素在HR20细胞内的积聚,其逆转抗药性作用与阻断细胞周期运行无关。CsA10μg·ml ̄(-1)处理HR20细胞,可引起50kDa的蛋白质高度磷酸化。结果提示:环孢菌素A阻断抗三尖杉酯碱的HL-60细胞于G_1期,而诱导敏感的HL-60细胞发生凋亡,其阻断作用与抗药性无关 相似文献
9.
Hydrolysis of peptides within lumen of small intestine 总被引:2,自引:0,他引:2
10.
A portion of the human surfactant protein A (SP-A) gene locus consists of a pseudogene 总被引:2,自引:0,他引:2
T R Korfhagen S W Glasser M D Bruno M J McMahan J A Whitsett 《American journal of respiratory cell and molecular biology》1991,4(5):463-469
SP-A is the most abundant, surfactant-associated protein isolated from lung lavage. Genomic blot analysis of total human cellular DNA with SP-A cDNA demonstrated the presence of multiple hybridizing fragments that are not accounted for by available SP-A gene sequences. In this report, we have cloned and characterized human genomic DNA fragments that account for some of the other hybridizing fragments. These clones contain nucleotide sequences that are highly homologous to the fourth intron and fifth exon of the human SP-A gene. Sequences upstream from these SP-A-like sequences are not detectable by Northern blot hybridization of SP-A-expressing cells and the SP-A-like sequences contain premature stop codons, consistent with the interpretation that these clones represent an SP-A pseudogene. Restriction fragments consistent with this pseudogene and the functional SP-A gene are present in a human chromosome 10 genomic library made from a single chromosome, showing that the functional SP-A gene and the pseudogene are syntenic. 相似文献