全文获取类型
收费全文 | 669篇 |
免费 | 82篇 |
出版年
2019年 | 7篇 |
2017年 | 12篇 |
2016年 | 14篇 |
2015年 | 16篇 |
2014年 | 11篇 |
2013年 | 29篇 |
2012年 | 23篇 |
2011年 | 25篇 |
2010年 | 14篇 |
2009年 | 7篇 |
2008年 | 18篇 |
2007年 | 28篇 |
2006年 | 17篇 |
2005年 | 19篇 |
2004年 | 18篇 |
2003年 | 22篇 |
2002年 | 21篇 |
2001年 | 17篇 |
2000年 | 18篇 |
1999年 | 16篇 |
1998年 | 13篇 |
1997年 | 7篇 |
1995年 | 8篇 |
1993年 | 10篇 |
1992年 | 10篇 |
1991年 | 11篇 |
1990年 | 8篇 |
1989年 | 8篇 |
1988年 | 17篇 |
1987年 | 23篇 |
1986年 | 19篇 |
1985年 | 16篇 |
1984年 | 16篇 |
1983年 | 7篇 |
1982年 | 9篇 |
1981年 | 5篇 |
1980年 | 5篇 |
1979年 | 5篇 |
1977年 | 7篇 |
1975年 | 10篇 |
1974年 | 5篇 |
1973年 | 9篇 |
1972年 | 10篇 |
1971年 | 6篇 |
1970年 | 14篇 |
1969年 | 9篇 |
1968年 | 9篇 |
1967年 | 6篇 |
1966年 | 6篇 |
1962年 | 5篇 |
排序方式: 共有751条查询结果,搜索用时 359 毫秒
31.
Female mice were exposed to varying absorbed doses (108–504 rad) of X-rays and mated at different intervals after irradiation (1–7, 8–14, 15–21 and 22–28 days). Uterine contents were examined at late pregnancy in order to detect early fetal deaths (dominant lethality) and malformations in the live fetuses.Two trends were apparent from data on abnormal fetuses. At each weekly interval, the incidence of abnormalities tended to rise with increase in dose, and, at any given dose, the incidence tended to increase with time after irradiation. Dwarfism and exencephaly were the two most common malformations found.The changes in incidence of dominant lethality and of abnormal fetuses with time and with dose follow each other closely, the highest incidence for both being reached in week 3 (59±4.7% for dominant lethals and 12.5±3.1% for abnormal fetuses, after 504 rad) indicating increased radiosensitivity of less mature oocytes. These results parallel those obtained from known genetic effects reported by other workers and suggest that testing for incidence of congenital malformations among offspring of treated animals may prove a useful means of assessing genetic hazards of radiation of chemicals. 相似文献
32.
Translocations induced by X-rays in post-meiotic germ cells of male guinea-pigs, golden hamsters and rabbits were studied cytologically in the F1 sons of the irradiated males. The percentage of spermatocytes displaying multivalent configurations varied with the translocation, but the average percentage appeared to depend on the species: fewer quadrivalents were observed in hamster than in guinea-pig heterozygotes and most were recorded for rabbit heterozygotes. Chain quadrivalents were more abundant than ring quadrivalents at meiosis for the guinea-pig and hamster, in contrast to the mouse. Too few translocation heterozygotes were examined to determine which meiotic configuration was the more prevalent in the rabbit. In all three species, as in the mouse, translocations were found which caused male sterility, due to partial or complete failure of spermatogenesis, although most translocations caused semi-sterility. For these semi-sterile males both the frequency and time of embryonic death in the progeny appeared to be the same as in the mouse. It is concluded that similar types of chromosome aberrations are induced by X-rays in post-meiotic germ cells of male guinea-pigs, rabbits, golden hamsters and mice. 相似文献
33.
Hopkins,Benjamin D. & Magnus Marsden (eds). Beyond SWAT: history,society and economy along the Afghanistan‐Pakistan frontier. xv, 365 pp., maps,illus., tables,figs, bibliogrs. London: Hurst, 2013. £39.99 (cloth)
下载免费PDF全文
![点击此处可从《The journal of the Royal Anthropological Institute》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Stephen M. Lyon 《The journal of the Royal Anthropological Institute》2015,21(2):494-495
34.
35.
36.
37.
O Robain G Ponsot G Lyon 《Comptes rendus des séances de la Société de biologie et de ses filiales》1976,170(5):951-955
Female rats were submitted to caloric and protein restriction 8 days before fecondation and during pregnancy. A reduction of the number of brain cells in the fetuses was evident only after the 20th day of pregnancy. This reduction appeared to be limited to glial cells, and not to affect neurons contrarily to what had previously been stated by some authors. 相似文献
38.
39.
Danilo ML Prado Fabiana B Benatti Ana L de Sá-Pinto Ana P Hayashi Bruno Gualano Rosa MR Pereira Adriana ME Sallum Eloisa Bonfá Clovis A Silva Hamilton Roschel 《Arthritis research & therapy》2013,15(2):R46
Introduction
Exercise training has emerged as a promising therapeutic strategy to counteract physical dysfunction in adult systemic lupus erythematosus. However, no longitudinal studies have evaluated the effects of an exercise training program in childhood-onset systemic lupus erythematosus (C-SLE) patients. The objective was to evaluate the safety and the efficacy of a supervised aerobic training program in improving the cardiorespiratory capacity in C-SLE patients.Methods
Nineteen physically inactive C-SLE patients were randomly assigned into two groups: trained (TR, n = 10, supervised moderate-intensity aerobic exercise program) and non-trained (NT, n = 9). Gender-, body mass index (BMI)- and age-matched healthy children were recruited as controls (C, n = 10) for baseline (PRE) measurements only. C-SLE patients were assessed at PRE and after 12 weeks of training (POST). Main measurements included exercise tolerance and cardiorespiratory measurements in response to a maximal exercise (that is, peak VO2, chronotropic reserve (CR), and the heart rate recovery (ΔHRR) (that is, the difference between HR at peak exercise and at both the first (ΔHRR1) and second (ΔHRR2) minutes of recovery after exercise).Results
The C-SLE NT patients did not present changes in any of the cardiorespiratory parameters at POST (P > 0.05). In contrast, the exercise training program was effective in promoting significant increases in time-to-exhaustion (P = 0.01; ES = 1.07), peak speed (P = 0.01; ES = 1.08), peak VO2 (P = 0.04; ES = 0.86), CR (P = 0.06; ES = 0.83), and in ΔHRR1 and ΔHRR2 (P = 0.003; ES = 1.29 and P = 0.0008; ES = 1.36, respectively) in the C-SLE TR when compared with the NT group. Moreover, cardiorespiratory parameters were comparable between C-SLE TR patients and C subjects after the exercise training intervention, as evidenced by the ANOVA analysis (P > 0.05, TR vs. C). SLEDAI-2K scores remained stable throughout the study.Conclusion
A 3-month aerobic exercise training was safe and capable of ameliorating the cardiorespiratory capacity and the autonomic function in C-SLE patients.Trial registration
NCT01515163. 相似文献40.
Sue Lyon 《Current fungal infection reports》2013,7(3):283-286
Antifungal prophylaxis reduces the risks of invasive fungal infection (IFI), all-cause mortality and fungal-related mortality in highly immunosuppressed haemato-oncology patients, but questions remain about the role of therapeutic drug monitoring in this patient population. There is also continuing debate concerning the benefits and risks of empirical versus pre-emptive antifungal therapy when breakthrough IFI occurs during prophylaxis. These topics were discussed during the 39th Annual Meeting of the European Group for Blood and Marrow Transplantation, held in London in April 2013. 相似文献