全文获取类型
收费全文 | 37565篇 |
免费 | 2481篇 |
国内免费 | 512篇 |
专业分类
耳鼻咽喉 | 726篇 |
儿科学 | 604篇 |
妇产科学 | 819篇 |
基础医学 | 5494篇 |
口腔科学 | 604篇 |
临床医学 | 3089篇 |
内科学 | 8320篇 |
皮肤病学 | 1138篇 |
神经病学 | 2540篇 |
特种医学 | 1886篇 |
外科学 | 5095篇 |
综合类 | 567篇 |
一般理论 | 15篇 |
预防医学 | 1541篇 |
眼科学 | 1035篇 |
药学 | 3334篇 |
中国医学 | 419篇 |
肿瘤学 | 3332篇 |
出版年
2023年 | 239篇 |
2022年 | 681篇 |
2021年 | 1159篇 |
2020年 | 578篇 |
2019年 | 917篇 |
2018年 | 1080篇 |
2017年 | 781篇 |
2016年 | 1085篇 |
2015年 | 1478篇 |
2014年 | 1778篇 |
2013年 | 2032篇 |
2012年 | 2997篇 |
2011年 | 3075篇 |
2010年 | 1849篇 |
2009年 | 1582篇 |
2008年 | 2225篇 |
2007年 | 2138篇 |
2006年 | 1918篇 |
2005年 | 1841篇 |
2004年 | 1541篇 |
2003年 | 1467篇 |
2002年 | 1324篇 |
2001年 | 854篇 |
2000年 | 768篇 |
1999年 | 711篇 |
1998年 | 280篇 |
1997年 | 254篇 |
1996年 | 221篇 |
1995年 | 192篇 |
1994年 | 169篇 |
1993年 | 113篇 |
1992年 | 322篇 |
1991年 | 246篇 |
1990年 | 277篇 |
1989年 | 269篇 |
1988年 | 263篇 |
1987年 | 216篇 |
1986年 | 186篇 |
1985年 | 171篇 |
1984年 | 149篇 |
1983年 | 114篇 |
1982年 | 84篇 |
1981年 | 76篇 |
1980年 | 73篇 |
1979年 | 131篇 |
1978年 | 84篇 |
1977年 | 69篇 |
1975年 | 60篇 |
1974年 | 57篇 |
1972年 | 52篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
31.
32.
33.
Rett's syndrome(RS) is a progressive neurodegenerative disorder characterized by exclusive occurrence in females, autistic behavior, dementia, gait ataxia, loss of purposeful use of the hands with stereotypic hand movement, and seizures. Initially RS was considered to be very rare; however, recent reports suggest that the prevalence is considerably higher and occurrence is world-wide. Because the pathophysiological process remains unknown, the diagnosis of RS is based mainly on its characteristic clinical features and course. We experienced two cases of RS which, to our knowledge, are the first reported in Korea. It is quite possible that many patients with RS not yet being diagnosed in Korea. 相似文献
34.
T M Ko C Y Hsieh H N Ho F J Hsieh T Y Lee 《American journal of obstetrics and gynecology》1991,164(3):901-906
To determine the genetic origin of the complete hydatidiform mole, 20 abnormal pregnancies were studied with restriction fragment length polymorphism with five genomic probes: EJ 6.6, beta-globin gene, 3'alpha-hypervariable region, J-Bir, and St14. In the 12 cases of molar pregnancy, pure paternal origin was proved in 11 cases, but both maternal and paternal inheritance were shown in only one case. In the cases with pure paternal origin, all of the restriction fragment length polymorphisms were homozygous, although those of the fathers were heterozygous at 15 loci. In the four cases that mimicked hydatidiform mole but were diagnosed as hydropic change of villi, both paternal and maternal inheritance were noted. In the four pregnancies with blighted ovum, both paternal and maternal inheritance were shown in three cases; and in one case with a balanced translocation between chromosomes 13 and 14, only paternal inheritance was noted. This study showed that most of the complete hydatidiform moles were caused by fertilization of an empty egg by a duplicated haploid sperm, but rare exceptions may exist. 相似文献
35.
Measurement of patient satisfaction is an essential part of health outcome assessment. The purpose of this study is (a) to compare the stability of an aggregate summary measure and two separate summary measures of patient satisfaction; and, (b) to examine causal effects between two separate summary measures at two points in time. Data were collected from 1,451 Medicare HMO beneficiaries. In conclusion, (a) separate summary measures are recommended for constructing the measure of patient satisfaction and (b) moderate causal relationships and cross-lagged effects between the patient satisfaction measures of qualify of care and access to care were found. 相似文献
36.
37.
38.
The hepatitis B immunization programme in Singapore 总被引:2,自引:0,他引:2
K T Goh S Doraisingham K L Tan C J Oon M L Ho A J Chen S H Chan 《Bulletin of the World Health Organization》1989,67(1):65-70
A voluntary immunization programme to prevent perinatal transmission of hepatitis B virus (HBV) infection in Singapore was implemented on 1 October 1985 as an integral component of the national childhood immunization programme. Up to April 1988, a total of 68,845 mothers who attended government maternal and child health clinics were screened for the disease. Of these, 2432 (3.5%) were positive for hepatitis B surface antigen (HBsAg) and 904 (1.3%) for hepatitis B e antigen (HBeAg). Virtually all the babies born to carrier mothers completed the full immunization schedule; and in addition, those of HBeAg-positive mothers were given a dose of hepatitis B immunoglobulin at birth. The hepatitis B immunization programme was extended on 1 September 1987 to cover all newborns. About 90% of the 15,943 babies delivered in government institutions from September 1987 to April 1988 were immunized at birth, with the subsequent doses being administered at maternal and child health clinics at 4-6 weeks and 5 months later. More than 85% of the children given the full course of plasma-derived and yeast-derived hepatitis B vaccine from birth continued to have protective antibody to HBV two years after immunization. The programme is being closely monitored to assess the duration of immunity and the need for booster doses, while seronegative adults are also being encouraged to be vaccinated. 相似文献
39.
40.
We present what we believe is the first case of rickets following prolonged treatment with aluminum containing antacids that bind phosphate, in an 18-year-old mentally retarded boy with cerebral palsy and spastic quadriplegia. As expected, serum calcitriol was increased and urinary phosphate excretion was very low. However, in contrast to all published cases of antacid induced hypophosphatemic osteomalacia in adults, despite a substantial increase in bone resorption reflected by urinary total hydroxyproline excretion, urinary calcium excretion was low rather than high, and significant hypocalcemia occurred after antacids were ceased and a phosphate salt administered. We suggest that the skeleton was so under-mineralized because of growth during prolonged phosphate deficiency, possibly augmented by anticonvulsant administration and immobilization, that increased bone resorption did not release enough calcium to cause hypercalciuria, or to prevent hypocalcemia during resumption of normal mineralization. 相似文献