全文获取类型
收费全文 | 5422篇 |
免费 | 638篇 |
国内免费 | 168篇 |
专业分类
耳鼻咽喉 | 55篇 |
儿科学 | 227篇 |
妇产科学 | 139篇 |
基础医学 | 164篇 |
口腔科学 | 78篇 |
临床医学 | 1222篇 |
内科学 | 1212篇 |
皮肤病学 | 113篇 |
神经病学 | 357篇 |
特种医学 | 179篇 |
外科学 | 1576篇 |
综合类 | 19篇 |
预防医学 | 308篇 |
眼科学 | 326篇 |
药学 | 36篇 |
肿瘤学 | 217篇 |
出版年
2023年 | 107篇 |
2021年 | 63篇 |
2020年 | 99篇 |
2019年 | 43篇 |
2018年 | 126篇 |
2017年 | 174篇 |
2016年 | 185篇 |
2015年 | 141篇 |
2014年 | 228篇 |
2013年 | 295篇 |
2012年 | 100篇 |
2011年 | 114篇 |
2010年 | 234篇 |
2009年 | 343篇 |
2008年 | 121篇 |
2007年 | 67篇 |
2006年 | 101篇 |
2005年 | 77篇 |
2003年 | 47篇 |
2002年 | 39篇 |
2001年 | 104篇 |
2000年 | 66篇 |
1999年 | 133篇 |
1998年 | 177篇 |
1997年 | 202篇 |
1996年 | 301篇 |
1995年 | 254篇 |
1994年 | 195篇 |
1993年 | 115篇 |
1992年 | 121篇 |
1991年 | 134篇 |
1990年 | 65篇 |
1989年 | 129篇 |
1988年 | 101篇 |
1987年 | 78篇 |
1986年 | 100篇 |
1985年 | 83篇 |
1984年 | 87篇 |
1983年 | 74篇 |
1982年 | 66篇 |
1981年 | 62篇 |
1980年 | 80篇 |
1979年 | 39篇 |
1978年 | 59篇 |
1977年 | 42篇 |
1976年 | 43篇 |
1975年 | 45篇 |
1972年 | 36篇 |
1964年 | 49篇 |
1963年 | 47篇 |
排序方式: 共有6228条查询结果,搜索用时 125 毫秒
61.
A E O'Hare MD FRCP G N Dutton FRCS FRCOphth D Green MB ChB MRCP Rosemary Coull 《Developmental medicine and child neurology》1998,40(6):417-420
The progress of cognitive visual dysfunction over an 8-year period of a child who sustained bilateral occipital-lobe infarctions at the age of 21/2 years is described. She survived with normal intelligence and went on to attend mainstream school. She manifested many features of cognitive visual impairment and, in particular, developed a form of pure alexia without agraphia. She achieved some letter-by-letter reading but no sight vocabulary development, including to her own name. She learned to write imaginatively employing phonetically true spelling but cannot read what she has written. Her progress and the difficulties encountered during the management of her condition are discussed in this first case report of the evolution of pure alexia without agraphia in childhood. The features of this syndrome in the developing child who has never developed the capacity to read are contrasted with that seen in affected adults. 相似文献
62.
63.
B. P. Kavanagh MB BSc Dr A. N. Sandler MB MSc K. E. Turner MD V. Wick BScN S. Lawson 《Journal of clinical monitoring and computing》1992,8(3):226-230
This study was designed to assess the accuracy of end-tidalPco 2 and transcutaneousPco 2 as measurements of arterialPco 2 in extubated, spontaneously breathing patients recovering from general anesthesia. In 30 patients, measurement of arterial transcutaneous, and end-tidalPco 2 were taken simultaneously with body temperature approximately every 15 minutes over a 2-hour period. ArterialPco 2 values were corrected for body temperature. Values for Paco 2 were compared with those forPetCO2 and Psco 2 by linear regression analysis and by calculation of bias ± precision. Thirty-six percent of the capnogram tracings obtained did not develop a plateau phase. We found poor correlation between end-tidal and arterialPco 2 regardless of the shape of the capnogram tracing, as well as poor correlation between transcutaneous and arterialPco 2. Although the measurements of bias and precision of noninvasivePco 2 monitors in this population are comparable to studies in other populations, we advise caution in relying on the routine use ofPetCO2 or Psco 2 for the noninvasive assessment of respiratory depression in extubated, spontaneously breathing patients recovering from general anesthesia. 相似文献
64.
65.
66.
67.
Zelinski-Wooten MB; Slayden OD; Chwalisz K; Hess DL; Brenner RM; Stouffer RL 《Human reproduction (Oxford, England)》1998,13(2):259-267
Large doses of antiprogestin typically disrupt menstrual cyclicity. A
chronic low-dose regimen of the potent new antiprogestin ZK 137 316, which
permits continued menstrual cyclicity but alters gonadal- reproductive
tract activity, was established. Rhesus monkeys received vehicle (n = 6) or
0.01 (n = 8), 0.03 (n = 8) or 0.1 (n = 5) mg ZK 137 316/kg body weight
daily for five menstrual cycles (C-1 to C-5). Oestradiol, progesterone and
gonadotrophin profiles were normal during cycles involving vehicle and 0.01
and 0.03 mg ZK 137 316/kg body weight. In the 0.1 mg/kg group, mid-cycle
oestradiol and gonadotrophin surges, and subsequent progesterone
production, were absent in C-3 and C-5. Ovarian cyclicity was accompanied
by timely menstruation in the vehicle and 0.01 mg/kg groups. By C-3, half
the animals in the 0.03 mg/kg group and all animals in the 0.1 mg/kg group
were amenorrhoeic. A corpus luteum was noted during the mid-luteal phase of
C-5 in the vehicle, 0.01 mg/kg and 0.03 mg/kg groups. Large antral and
cystic follicles were evident in the 0.1 mg/kg group. Thus, a daily
treatment with 0.01 mg/kg ZK 136317 permitted normal menstrual cyclicity in
macaques. While the daily administration of 0.03 mg/kg ZK 136 317 allowed
ovarian cyclicity, menstruation was disrupted in some animals. Increasing
the dose to 0.1 mg/kg antagonized pituitary function and resulted in
anovulation and amenorrhoea. A chronic low-dose regimen of the
antiprogestin ZK 137 316, which permits normal ovarian/menstrual cyclicity,
has potential as a contraceptive in women.
相似文献
68.
Nisselle AE Delatycki MB Collins V Metcalfe S Aitken MA du Sart D Halliday J Macciocca I Wakefield A Hill V Gason A Warner B Calabro V Williamson R Allen KJ 《Clinical genetics》2004,65(5):358-367
There is debate as to whether community genetic screening for the mutation(s) causing hereditary hemochromatosis (HH) should be implemented, due to issues including disease penetrance, health economic outcomes, and concerns about community acceptance. Hemochromatosis is a common preventable iron overload disease, due in over 90% of cases to C282Y homozygosity in the HFE gene. We are, therefore, piloting C282Y screening to assess understanding of genetic information and screening acceptability in the workplace setting. In this program, HaemScreen, education was by oral or video presentation in a group setting. C282Y status was assessed by polymerase chain reaction (PCR) and melt-curve analysis on DNA obtained by cheek-brush sampling. Of eligible participants, 5.8% (1.5-15.8%) attended information and screening sessions, of whom 97.7% (5571 individuals) chose to be tested. Twenty-two C282Y (1 : 253) homozygotes were identified and offered clinical follow-up. There were 638 heterozygotes (1 : 8.7). The determinants for participation have been analyzed in terms of the principles outlined in the Health Belief Model. Widespread screening for HH is readily accepted in a workplace setting, and a one-to-many education program is effective. The level of participation varies greatly and the advertizing and session logistics should be adapted to the specific features of each workplace. 相似文献
69.
Debelenko LV; Brambilla E; Agarwal SK; Swalwell JI; Kester MB; Lubensky IA; Zhuang Z; Guru SC; Manickam P; Olufemi SE; Chandrasekharappa SC; Crabtree JS; Kim YS; Heppner C; Burns AL; Spiegel AM; Marx SJ; Liotta LA; Collins FS; Travis WD; Emmert-Buck MR 《Human molecular genetics》1997,6(13):2285-2290
Lung carcinoids occur sporadically and rarely in association with multiple
endocrine neoplasia type 1 (MEN1). There are no well defined genetic
abnormalities known to occur in these tumors. We studied 11 sporadic lung
carcinoids for loss of heterozygosity (LOH) at the locus of the MEN1 gene
on chromosome 11q13, and for mutations of the MEN1 gene using dideoxy
fingerprinting. Additionally, a lung carcinoid from a MEN1 patient was
studied. In four of 11 (36%) sporadic tumors, both copies of the MEN1 gene
were inactivated. All four tumors showed the presence of a MEN1 gene
mutation and loss of the other allele. Observed mutations included a 1 bp
insertion, a 1 bp deletion, a 13 bp deletion and a single nucleotide
substitution affecting a donor splice site. Each mutation predicts
truncation or potentially complete loss of menin. The remaining seven
tumors showed neither the presence of a MEN1 gene mutation nor 11q13 LOH.
The tumor from the MEN1 patient showed LOH at chromosome 11q13 and a
complex germline MEN1 gene mutation. The data implicate the MEN1 gene in
the pathogenesis of sporadic lung carcinoids, representing the first
defined genetic alteration in these tumors.
相似文献
70.
In some parts of the United Kingdom (UK), family doctors (or "general practitioners" as they are called in the UK) are routinely called upon by the emergency medical services (EMS) system to attend road accidents. The doctors are volunteers and travel to the scene of the accident in their own cars. Members of one such general practitioner accident service operating in Mid-Anglia complete an accident report form after attending each incident. In 1983, the Mid-Anglia General Practitioner Accident Service (MAGPAS) received 1,715 calls for medical assistance, and in 95% of these a doctor was sent immediately. Of these calls, 57% were passed to the doctor within one minute of the receipt of the call in the MAGPAS control room, and 78% were relayed within two minutes. This rapid call-out, combined with the close proximity of the local doctor to the accident site, resulted in the doctors arriving ahead of the ambulance in 42% of the calls. A total of 54 patients with airway obstruction were treated by the doctors prior to the arrival of the ambulance. Ninety-nine patients required immediate intravenous fluid replacement in the pre-hospital phase of their medical care. This report suggests that general practitioners in rural areas can play a vital role in the early management of trauma patients, especially in the absence of ambulance personnel trained in advanced life support skills. 相似文献