全文获取类型
收费全文 | 304篇 |
免费 | 22篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 5篇 |
2021年 | 9篇 |
2020年 | 5篇 |
2019年 | 9篇 |
2018年 | 5篇 |
2017年 | 7篇 |
2016年 | 7篇 |
2015年 | 19篇 |
2014年 | 11篇 |
2013年 | 23篇 |
2012年 | 23篇 |
2011年 | 16篇 |
2010年 | 20篇 |
2009年 | 11篇 |
2008年 | 21篇 |
2007年 | 12篇 |
2006年 | 20篇 |
2005年 | 23篇 |
2004年 | 17篇 |
2003年 | 21篇 |
2002年 | 21篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1997年 | 3篇 |
1995年 | 1篇 |
1994年 | 3篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1983年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有326条查询结果,搜索用时 15 毫秒
221.
Concentrations of Tryptoline and Methtryptoline in Rat Brain 总被引:2,自引:1,他引:1
Pekka Peura Jodie V. Johnson Richard A. Yost Kym F. Faull 《Journal of neurochemistry》1989,52(3):847-852
Combined gas chromatography-mass spectrometry and gas chromatography-tandem mass spectrometry have been used to identify and quantify tryptoline, methtryptoline, 5-hydroxytryptoline, and 5-hydroxymethtryptoline as their heptafluorobutyryl derivatives in extracts of rat brain. Tryptoline and methtryptoline were identified on the basis of their retention times and mass spectral characteristics: they were reliably detected in brain tissue extracts without interference from artifactual formation; their whole brain concentrations ranged between 0.2 and 3 ng/g; and they had a similar neuroanatomical distribution, with the highest concentrations in the cerebellum and the cortex. Smaller quantities of 5-hydroxytryptoline and 5-hydroxymethtryptoline were also identified on the basis of their retention times and mass spectral characteristics. However, the significance of this finding is unclear, because these two compounds were accompanied by larger quantities of their tetradeuterated analogues formed from tetradeuterated-5-hydroxytryptamine added at the time of tissue homogenization; this result suggests that formation of 5-hydroxytryptoline and 5-hydroxymethtryptoline occurred during tissue homogenization, sample preparation, or both. 相似文献
222.
RUNX‐mediated growth arrest and senescence are attenuated by diverse mechanisms in cells expressing RUNX1 fusion oncoproteins
下载免费PDF全文
![点击此处可从《Journal of cellular biochemistry》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Gail Anderson Nancy Mackay Kathryn Gilroy Jodie Hay Gillian Borland Alma McDonald Margaret Bell Siti Ayuni Hassanudin Ewan Cameron James C. Neil Anna Kilbey 《Journal of cellular biochemistry》2018,119(3):2750-2762
223.
Ju-Kyung Yu Jodie Mangor Lucy Thompson Keith J Edwards Mary B Slabaugh Steven J Knapp 《Génome》2002,45(4):652-660
Simple sequence repeat (SSR) markers were developed for cultivated sunflower (Helianthus annuus L.) from the DNA sequences of 970 clones isolated from genomic DNA libraries enriched for (CA)n,, (CT)n, (CAA)n, (CATA)n, or (GATA)n. The clones harbored 632 SSRs, of which 259 were unique. SSR markers were developed for 130 unique SSRs by designing and testing primers for 171 unique SSRs. Of the total, 74 SSR markers were polymorphic when screened for length polymorphisms among 16 elite inbred lines. The mean number of alleles per locus was 3.7 for dinucleotide, 3.6 for trinucleotide, and 9.5 for tetranucleotide repeats and the mean polymorphic information content (PIC) scores were 0.53 for dinucleotide, 0.53 for trinucleotide, and 0.83 for tetranucleotide repeats. Cluster analyses uncovered patterns of genetic diversity concordant with patterns produced by RFLP fingerprinting. SSRs were found to be slightly more polymorphic than RFLPs. Several individual SSRs were significantly more polymorphic than RFLP and other DNA markers in sunflower (20% of the polymorphic SSR markers had PIC scores ranging from 0.70 to 0.93). The newly developed SSRs greatly increase the supply of sequence-based DNA markers for DNA fingerprinting, genetic mapping, and molecular breeding in sunflower; however, several hundred additional SSR markers are needed to routinely construct complete genetic maps and saturate the genome. 相似文献
224.
225.
Hess Sybille Allan Bridie J. M. Hoey Andrew S. Jarrold Michael D. Wenger Amelia S. Rummer Jodie L. 《Coral reefs (Online)》2019,38(1):103-108
Coral Reefs - Declining water quality, in particular elevated suspended sediments, poses a significant threat to coastal coral reefs. We exposed juvenile anemonefish (Amphiprion melanopus) to two... 相似文献
226.
Nigel A. S. Taylor Mark A. Osborne Tara L. A. Bube Jodie M. Stocks 《European journal of applied physiology and occupational physiology》1999,80(5):505-507
This project investigated the sensitivity of oxygen uptake (VO(2)) dynamics to training-induced physiological changes, across a broad spectrum of endurance-training histories. Forty subjects participated: sedentary (n = 10), active healthy (n = 10), regular runners (n = 10), and competitive distance runners (n = 10). Subjects completed a cycle step-function protocol, to elicit a steady state at 60% maximal work rate. Breath-by-breath data were collected for VO(2) and cardiac frequency (f(c)), and modelled mathematically, and used to determine the average response times to attain 20%, 40%, 60%, 80% and 100% of the respective steady states. The between-group comparisons for both VO(2) and f(c) revealed significantly faster response times to 40%, 60%, 80% and 100% of the induced response, for the better trained subjects (P < 0.05). In general, this technique permitted differentiation between the VO(2) and f(c) response dynamics of non-elite subjects from a broad range of endurance-training histories, with differences becoming more pronounced as subjects approached the steady state. 相似文献
227.
228.
Litterfall and Decomposition in Relation to Soil Carbon Pools Along a Secondary Forest Chronosequence in Puerto Rico 总被引:5,自引:0,他引:5
Rebecca Ostertag Erika Marín-Spiotta Whendee L. Silver Jodie Schulten 《Ecosystems》2008,11(5):701-714
Secondary forests are becoming increasingly widespread in the tropics, but our understanding of how secondary succession affects
carbon (C) cycling and C sequestration in these ecosystems is limited. We used a well-replicated 80-year pasture to forest
successional chronosequence and primary forest in Puerto Rico to explore the relationships among litterfall, litter quality,
decomposition, and soil C pools. Litterfall rates recovered rapidly during early secondary succession and averaged 10.5 (±
0.1 SE) Mg/ha/y among all sites over a 2-year period. Although forest plant community composition and plant life form dominance
changed during succession, litter chemistry as evaluated by sequential C fractions and by 13C-nuclear magnetic resonance spectroscopy did not change significantly with forest age, nor did leaf decomposition rates.
Root decomposition was slower than leaves and was fastest in the 60-year-old sites and slowest in the 10- and 30-year-old
sites. Common litter and common site experiments suggested that site conditions were more important controls than litter quality
in this chronosequence. Bulk soil C content was positively correlated with hydrophobic leaf compounds, suggesting that there
is greater soil C accumulation if leaf litter contains more tannins and waxy compounds relative to more labile compounds.
Our results suggest that most key C fluxes associated with litter production and decomposition re-establish rapidly—within
a decade or two—during tropical secondary succession. Therefore, recovery of leaf litter C cycling processes after pasture
use are faster than aboveground woody biomass and species accumulation, indicating that these young secondary forests have
the potential to recover litter cycling functions and provide some of the same ecosystem services of primary forests. 相似文献
229.
230.