全文获取类型
收费全文 | 92篇 |
免费 | 10篇 |
出版年
2016年 | 2篇 |
2015年 | 7篇 |
2014年 | 3篇 |
2013年 | 7篇 |
2012年 | 4篇 |
2011年 | 3篇 |
2010年 | 5篇 |
2008年 | 9篇 |
2007年 | 2篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2004年 | 2篇 |
2003年 | 1篇 |
2001年 | 2篇 |
1999年 | 2篇 |
1998年 | 4篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1991年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1982年 | 2篇 |
1978年 | 1篇 |
1975年 | 2篇 |
1959年 | 1篇 |
1958年 | 6篇 |
1957年 | 2篇 |
1956年 | 1篇 |
1955年 | 3篇 |
1954年 | 2篇 |
1953年 | 5篇 |
1952年 | 5篇 |
1950年 | 3篇 |
1949年 | 1篇 |
1947年 | 1篇 |
排序方式: 共有102条查询结果,搜索用时 15 毫秒
1.
HESS R SCARPELLI DG PEARSE AG 《The Journal of biophysical and biochemical cytology》1958,4(6):753-760
Methods are presented for the intramitochondrial localization of various diphosphopyridine nucleotide and triphosphopyridine nucleotide-linked dehydrogenases in tissue sections. The cytochemical reactions studied involve the oxidation of the substrates by a specific pyridino-protein. The electron transfer of tetrazolium salt is mediated by the diaphorase system associated with the dehydrogenase. The final electron acceptor was either p-nitrophenyl substituted ditetrazole (nitro-BT) or N-thiazol-2-yl monotetrazole (MTT), the latter giving rise to metal formazan in the presence of cobaltous ions. Mitochondrial localization of the formazan precipitate could be achieved by using hypertonic incubating media containing high concentrations of substrate and co-enzyme. A fast reduction of tetrazolium salt was obtained by chemically blocking the respiratory chain enzymes beyond the flavoproteins. Although diaphorase systems are implicated in the reduction of tetrazolium salts, specific dehydrogenases are solely responsible for the distinct distribution pattern obtained in tissues with various substrates. The present findings in tissue sections are discussed in conjunction with existing biochemical evidence from differential centrifugation experiments. 相似文献
2.
Growth Zones in the Echinoid Skeleton 总被引:1,自引:0,他引:1
Growth zones in echinoid skeletal ossicles are mainly the resultof differences in structural characteristics. In the test plates,opaque zones, which appear light in reflected light, dark intransmitted light, and are X-ray dense, have relatively largertrabecules and smaller intertrabecular channels. Translucentzones, which appear dark in reflected light, light in transmittedlight, and are less X-ray dense, have relatively smaller trabeculesand larger intertrabecular channels. Organic material in theplates, especially when pigmented or charred, enhances the appearanceof the growth zones. Opaque zones result from relatively fastplate growth while translucent zones result from relativelyslow plate growth; food deprivation leads to the formation oftranslucent zones. The growth zones appear to be formed seasonally,at least in some cases, probably in relation to seasonal changesin growth rates, and perhaps in relation to seasonal reproductiveactivity 相似文献
3.
Paul S Marley Aboubacar Toure Jay Shebayan DA Aba AO Toure AG Diallo 《Archives Of Phytopathology And Plant Protection》2013,46(1):29-34
Fourteen elite sorghum lines were evaluated for their resistance to Striga hermonthica at three locations in Nigeria and Mali. Results showed that many of the lines especially MALISOR 84-1, SAMSORG 41, 97-SB-F5DT-64 (Keninkédié) and the check SRN 39 remained resistant to Striga in all locations with low emerged Striga counts, while SAMSORG 14 had the highest Striga infestation in all locations. Considerable variation in reaction to Striga infestation was observed on Séguètana, 97-SB-F5DT-63 (Wasa), 97-SB-F5DT-65, CMDT 38, CMDT 39 and CMDT 45 which were susceptible to Striga at Samaru, Nigeria but were resistant to Striga at both locations in Mali. Based on low Striga resistance and high grain yield, lines MALISOR 84-1, SAMSORG 41, 97-SB-F5DT-64, 97-SB-F5DT-65, CMDT 39 and SAMSORT 14 have been nominated for wider evaluation across more West African countries. 相似文献
4.
5.
Carmen Martínez José A Molina Hortensia Alonso-Navarro Félix J Jiménez-Jiménez José AG Agúndez Elena García-Martín 《BMC neurology》2010,10(1):71
Background
Human serum paraoxonase 1 (PON1) plays a major role in the metabolism of several organophosphorus compounds. The enzyme is encoded by the polymorphic gene PON1, located on chromosome 7q21.3. Aiming to identify genetic variations related to the risk of developing brain tumors, we investigated the putative association between common nonsynonymous PON1 polymorphisms and the risk of developing astrocytoma and meningioma. 相似文献6.
JI Priego AG Lucas-Cuevas I Aparicio JV Giménez JM Cortell-Tormo P Pérez-Soriano 《Biology of sport / Institute of Sport》2015,32(3):219-223
The use of graduated compression stockings (GCS) in sport has been increasing in the last years due to their potential positive effects for athletes. However, there is little evidence to support whether these types of garments actually improve cardiorespiratory performance. The aim of this study was to examine the cardiorespiratory responses of GCS during running after three weeks of regular use. Twenty recreational runners performed three tests on different days: test 1) – a 5-min maximal effort run in order to determine the participants’ maximal aerobic speed; and tests 2) and 3) – a fatigue running test of 30 minutes at 80% of their maximal aerobic speed with either GCS or PLACEBO stockings at random. Cardiorespiratory parameters (minute ventilation, heart rate, relative oxygen consumption, relative carbon dioxide production, ventilatory equivalents for oxygen and carbon dioxide, and oxygen pulse) were measured. Before each test in the laboratory, the participants trained with the randomly assigned stockings (GCS or PLACEBO) for three weeks. No significant differences between GCS and PLACEBO were found in any of the cardiorespiratory parameters. In conclusion, the present study provides evidence that running with GCS for three weeks does not influence cardiorespiratory parameters in recreational runners. 相似文献
7.
8.
9.
10.