全文获取类型
收费全文 | 153331篇 |
免费 | 10066篇 |
国内免费 | 771篇 |
专业分类
耳鼻咽喉 | 1406篇 |
儿科学 | 3904篇 |
妇产科学 | 2767篇 |
基础医学 | 20611篇 |
口腔科学 | 3455篇 |
临床医学 | 14732篇 |
内科学 | 32989篇 |
皮肤病学 | 2877篇 |
神经病学 | 14818篇 |
特种医学 | 6137篇 |
外国民族医学 | 6篇 |
外科学 | 23049篇 |
综合类 | 1912篇 |
现状与发展 | 2篇 |
一般理论 | 139篇 |
预防医学 | 11062篇 |
眼科学 | 3202篇 |
药学 | 10497篇 |
2篇 | |
中国医学 | 246篇 |
肿瘤学 | 10355篇 |
出版年
2023年 | 818篇 |
2022年 | 1238篇 |
2021年 | 2830篇 |
2020年 | 1963篇 |
2019年 | 2820篇 |
2018年 | 3429篇 |
2017年 | 2663篇 |
2016年 | 3049篇 |
2015年 | 3517篇 |
2014年 | 5035篇 |
2013年 | 6807篇 |
2012年 | 10530篇 |
2011年 | 11155篇 |
2010年 | 6361篇 |
2009年 | 6053篇 |
2008年 | 10205篇 |
2007年 | 10891篇 |
2006年 | 10354篇 |
2005年 | 10604篇 |
2004年 | 10006篇 |
2003年 | 9494篇 |
2002年 | 8912篇 |
2001年 | 1493篇 |
2000年 | 1117篇 |
1999年 | 1602篇 |
1998年 | 2108篇 |
1997年 | 1648篇 |
1996年 | 1422篇 |
1995年 | 1291篇 |
1994年 | 1140篇 |
1993年 | 1113篇 |
1992年 | 775篇 |
1991年 | 783篇 |
1990年 | 609篇 |
1989年 | 596篇 |
1988年 | 559篇 |
1987年 | 570篇 |
1986年 | 508篇 |
1985年 | 536篇 |
1984年 | 636篇 |
1983年 | 566篇 |
1982年 | 760篇 |
1981年 | 701篇 |
1980年 | 603篇 |
1979年 | 366篇 |
1978年 | 377篇 |
1977年 | 404篇 |
1976年 | 342篇 |
1975年 | 297篇 |
1974年 | 251篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
42.
This was a retrospective observational study of 11 consecutive patients of major primary postpartum haemorrhage (PPH) who had the B-Lynch suture at the time of caesarean section, performed between 1 March 2001 and 31 March 2004 at a teaching hospital in Scotland. Case-note review was performed in 123 patients, who had major primary PPH to identify patients who had B-Lynch sutures at the time of caesarean section. The patient's age, parity, gestation of pregnancy at which the B-Lynch suture was performed, the indication for caesarean section and the cause of primary major PPH were recorded. The operative details, intraoperative and immediate postoperative complications and the need for subsequent hysterectomy were noted. The patients were followed-up with clinic visits at 6 weeks and any further hospital referral for late postoperative complications and whether subsequent successful pregnancy was achieved, were documented. The incidence of major PPH in our centre was 0.5% of the total deliveries, of which 11 cases had the B-Lynch suture applied at the time of caesarean section. The patients were aged between 25 and 38 years old (mean 31 years). Parity ranged from 0 to 1 and the gestational age at which the procedure was performed ranged from 34 to 41 weeks (mean 38 weeks). Ten operations (91%) were performed by senior registrars supervised by the consultant on call and one (9%) case was performed by a consultant on call. All cases had the B-Lynch sutures performed for major primary PPH caused by uterine atony at the time of caesarean section. The weight of the babies delivered ranged between 2,110 - 4,820 g (mean 3,500 g). The total blood loss at surgery ranged from 2,000 - 10,000 ml (mean 3,500 ml). Only three patients (28%) required hysterectomy. All the patients made a good postoperative recovery. The hospital stay ranged from 4 - 24 days (mean 8 days). The patient who remained in hospital for 24 days did so because her baby was admitted into the neonatal unit. All the patients were reviewed 6 weeks postnatally. There was no significant morbidity. A subsequent successful pregnancy has been achieved in one patient. 相似文献
43.
The influence of formulation components on the aerosolisation properties of spray-dried powders. 总被引:5,自引:0,他引:5
Dry powders suitable for inhalation containing beta-estradiol, leucine as a dispersibility enhancer and lactose as a bulking agent were prepared by spray-drying from aqueous ethanol formulations. The influence of formulation components on the characteristics of the resultant spray-dried powders was examined through the use of a range of ethanol concentrations (10-50% v/v) in the solvent used to prepare the initial formulations. Additionally, the amount of leucine required to act as a dispersibility enhancer was investigated by varying the amount of leucine added to the formulation prior to spray-drying. Following spray-drying, resultant powders were characterised using scanning electron microscopy, laser diffraction and tapped density measurements, and the aerosolisation performance determined using Twin Stage Impinger and Andersen Cascade Impactor analysis. We demonstrate that selection of appropriate solvent systems and leucine concentration allows the preparation of spray-dried powders that display enhanced aerosolisation properties, and would be predicted to exhibit high deposition in the lower regions of the respiratory tract. 相似文献
44.
Marcel J. Kooy Wouter S. Dessing Esther F. Kroodsma Steven R. J. G. Smits Esther H. Fietje Martine Kruijtbosch Peter A. G. M. De Smet 《Pharmacy World & Science》2007,29(2):81-89
OBJECTIVE: According to a report published by the federation of Dutch patients' associations, patients would like to see a pharmacist, who acts more as a personal adviser. This raised the question, how often Dutch community pharmacists have personal consultations with their patients in daily practice, on which factors this depends, and what kind of topics are discussed during these meetings. SETTING: Community pharmacies in the Netherlands. METHOD: A questionnaire was distributed among 800 randomly selected pharmacies. Questions were restricted to consultations characterized by one-to-one contact, drug therapy related content, and adequate privacy. These consultations were labelled as pharmaceutical consultations in private to distinguish them from other contacts between pharmacists and patients. MAIN OUTCOME MEASURE: Number, content, and character of consultations. RESULTS: 198 (24.8%) community pharmacies responded. The pharmacists provide an average of roughly 1.2 consultations in private per working day. The vast majority of respondents provided face-to-face and telephone consultations (94.4 and 91.9%, respectively), only a minority gave consultations by e-mail (30.8%). These consultations primarily dealt with topics related to medication safety. The mean overall time spent was 290 min per month. A relatively high frequency of personal consultations was significantly associated with the absolute number of full-time equivalent pharmacists in the pharmacy. CONCLUSION: The frequency of pharmaceutical consultations in private is low, but may be improved by reorganisation of the pharmacist's activities. The possibility of personal consultations by e-mail is not yet well-developed. Further research is needed to assess the patient's view of pharmaceutical consultations in private. 相似文献
45.
Williamson Kathleen A.; Hever Ann M.; Rainger Joe; Rogers R. Curtis; Magee Alex; Fiedler Zdenek; Keng Wee Teik; Sharkey Freddie H.; McGill Niolette; Hill Clare J.; Schneider Adele; Messina Mario; Turnpenny Peter D.; Fantes Judy A.; van Heyningen Veronica; FitzPatrick David R. 《Human molecular genetics》2006,15(12):2030
Table 1 相似文献
46.
47.
Milos Jesenak MD PhD Peter Banovcin MD PhD Zuzana Rennerova MD PhD Lubica Jakusova MD PhD Zuzana Havlicekova MD PhD Vladimir Pohanka MD PhD MPH FCCP Maria Pia Villa MD PhD Roberto Ronchetti MD PhD 《International journal of dermatology》2009,48(9):941-946
Background The atopy patch test (APT) is no longer an experimental method; it is increasingly being used as a standard diagnostic tool for the characterization of patients with aeroallergen- and food-triggered disorders. Some technical aspects of this test still remain to be answered. We aimed to study the reproducibility of this test over time in the general child population.
Methods In a general population of 118 children, we investigated the reproducibility of duplicate APTs with four food allergens in their native form, which were repeated at set intervals from the first test: 7 days (group 1), 14 days (group 2), and 21 days (group 3).
Results We observed very poor reproducibility on both sides of the back in all three studied subgroups. The reproducibility rates and Cohen's κ values did not improve when we did not consider the side of the back. There were no differences in the prevalence of atopy between the subjects with reproducible and nonreproducible APT results. All three groups studied showed no difference in the prevalence rates of atopy. There was no relationship between APT and skin prick test positivity for the same allergen. Questionnaire-derived data about previous food-related reactions did not help in the evaluation of the doubtful nonreproducible APT results with food allergens.
Conclusions Our results show that the reproducibility of food APTs is poor and unsatisfactory over time, and there is an urgent need for the development of optimal, stable, and good-quality APT testing substances. 相似文献
Methods In a general population of 118 children, we investigated the reproducibility of duplicate APTs with four food allergens in their native form, which were repeated at set intervals from the first test: 7 days (group 1), 14 days (group 2), and 21 days (group 3).
Results We observed very poor reproducibility on both sides of the back in all three studied subgroups. The reproducibility rates and Cohen's κ values did not improve when we did not consider the side of the back. There were no differences in the prevalence of atopy between the subjects with reproducible and nonreproducible APT results. All three groups studied showed no difference in the prevalence rates of atopy. There was no relationship between APT and skin prick test positivity for the same allergen. Questionnaire-derived data about previous food-related reactions did not help in the evaluation of the doubtful nonreproducible APT results with food allergens.
Conclusions Our results show that the reproducibility of food APTs is poor and unsatisfactory over time, and there is an urgent need for the development of optimal, stable, and good-quality APT testing substances. 相似文献
48.
49.
Peter Angelos 《World journal of surgery》2009,33(4):609-611
50.