收费全文 | 2367篇 |
免费 | 98篇 |
2465篇 |
2024年 | 6篇 |
2023年 | 7篇 |
2022年 | 37篇 |
2021年 | 63篇 |
2020年 | 38篇 |
2019年 | 39篇 |
2018年 | 50篇 |
2017年 | 53篇 |
2016年 | 71篇 |
2015年 | 84篇 |
2014年 | 136篇 |
2013年 | 167篇 |
2012年 | 210篇 |
2011年 | 201篇 |
2010年 | 108篇 |
2009年 | 96篇 |
2008年 | 127篇 |
2007年 | 126篇 |
2006年 | 139篇 |
2005年 | 93篇 |
2004年 | 92篇 |
2003年 | 93篇 |
2002年 | 83篇 |
2001年 | 16篇 |
2000年 | 13篇 |
1999年 | 11篇 |
1998年 | 26篇 |
1997年 | 13篇 |
1996年 | 5篇 |
1995年 | 14篇 |
1994年 | 10篇 |
1993年 | 13篇 |
1992年 | 21篇 |
1991年 | 23篇 |
1990年 | 9篇 |
1989年 | 16篇 |
1988年 | 13篇 |
1987年 | 14篇 |
1985年 | 10篇 |
1984年 | 14篇 |
1983年 | 5篇 |
1982年 | 10篇 |
1980年 | 10篇 |
1979年 | 12篇 |
1978年 | 6篇 |
1977年 | 14篇 |
1975年 | 8篇 |
1973年 | 8篇 |
1972年 | 5篇 |
1970年 | 5篇 |
Introduction
Hyperglycaemia in pregnancy (HIP), i.e. gestational diabetes mellitus (GDM) and diabetes in pregnancy (DIP), increases the risk of various short- and long-term adverse outcomes. However, much remains to be understood about the role of different risk factors in development of HIP.Objective
The aims of this observational study were to examine the role of potential risk factors for HIP, and to investigate whether any single or accumulated risk factor(s) could be used to predict HIP among women attending GDM screening at three centres in urban, semi-urban and rural Tamil Nadu, India.Methodology
Pregnant women underwent a 75 g oral glucose tolerance test. Data on potential risk factors was collected and analysed using logistical regression analysis. Receiver operating characteristic (ROC) curves, sensitivity, specificity and predictive values were calculated for significant risk factors and a risk factor scoring variable was constructed.Results
HIP was prevalent in 18.9% of the study population (16.3% GDM; 2.6% DIP). Increasing age and BMI as well as having a mother only or both parents with diabetes were significant independent risk factors for HIP. Among women attending the rural health centre a doubling of income corresponded to an 80% increased risk of HIP (OR 1.80, 95%CI 1.10–2.93; p = 0.019), whereas it was not significantly associated with HIP among women attending the other health centres. The performance of the individual risk factors and the constructed scoring variable differed substantially between the three health centres, but none of them were good enough to discriminate between those with and without HIP.Conclusions
The findings highlight the importance of socio-economic circumstances and intergenerational risk transmission in the occurrence of HIP as well as the need for universal screening. 相似文献Iron deficiency anaemia is a major challenge among consumers in developing countries. Given the deficiency of iron in the diet, there is an urgent need to devise a strategy for providing the required iron in the daily diet to counter the iron deficiency anaemia. We propose that iron biofortification of wheat (Triticum aestivum L.) through seed priming would be an innovative strategy to address this issue. This investigation attempts to find the interaction of iron oxide nanoparticles on germination, growth parameters and accumulation of grain iron in two contrasting wheat genotypes WL711 (low-iron genotype) and IITR26 (high-iron genotype). Wheat seeds were primed with different concentrations of iron oxide nanoparticles in the range of 25–600 ppm, resulting in differential accumulation of grain iron contents. We observed a pronounced increase in germination percentage and shoot length at 400 and 200 ppm treatment concentrations in IITR26 and WL711 genotypes, respectively. Intriguingly, the treatment concentration of 25 ppm demonstrated higher accumulation with a significant increase in grain iron contents to 45.7% in IITR26 and 26.8% in WL711 genotypes, respectively. Seed priming represents an innovative and user-friendly approach for wheat biofortification which triggers iron acquisition and accumulation in grains.
相似文献