全文获取类型
收费全文 | 280篇 |
免费 | 17篇 |
出版年
2023年 | 2篇 |
2022年 | 5篇 |
2021年 | 6篇 |
2020年 | 2篇 |
2019年 | 5篇 |
2018年 | 6篇 |
2017年 | 7篇 |
2016年 | 7篇 |
2015年 | 20篇 |
2014年 | 11篇 |
2013年 | 22篇 |
2012年 | 23篇 |
2011年 | 23篇 |
2010年 | 14篇 |
2009年 | 6篇 |
2008年 | 17篇 |
2007年 | 23篇 |
2006年 | 15篇 |
2005年 | 14篇 |
2004年 | 8篇 |
2003年 | 5篇 |
2002年 | 4篇 |
2001年 | 7篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1996年 | 5篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1977年 | 1篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1969年 | 3篇 |
1968年 | 1篇 |
1966年 | 1篇 |
1964年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有297条查询结果,搜索用时 15 毫秒
41.
42.
Mauricio Canals Claudio Veloso Lucila Moreno Rigoberto Solis 《Physiological Entomology》2015,40(3):232-238
The rates of oxygen consumption and carbon dioxide release of primitive hunters and weaver spiders, the Chilean Recluse spider Loxosceles laeta Nicolet (Araneae: Sicariidae) and the Chilean Tiger spider Scytodes globula Nicolet (Araneae: Scytodidae), are analyzed, and their relationship with body mass is studied. The results are compared with the metabolic data available for other spiders. A low metabolic rate is found both for these two species and other primitive hunters and weavers, such as spiders of the families Dysderidae and Plectreuridae. The metabolic rate of this group is lower than in nonprimitive spiders, such as the orb weavers (Araneae: Araneidae). The results reject the proposition of a general relationship for metabolic rate for all land arthropods (related to body mass) and agree with the hypothesis that metabolic rates are affected not only by sex, reproductive and developmental status, but also by ecology and life style, recognizing here, at least in the araneomorph spiders, a group having low metabolism, comprising the primitive hunters and weaver spiders, and another group comprising the higher metabolic rate web building spiders (e.g. orb weavers). 相似文献
43.
E. Schiantarelli A. De la Peña M. Candela 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2001,102(2-3):335-341
The Landsberg erecta× Columbia recombinant inbred lines (RILs) of Arabidopsis have been used in order to identify and localize chromosome regions involved in the genetic control of the in vitro regeneration
ability. Callus morphology (CM) and shoot regeneration (SR) traits have been considered for both leaf and root explants. The
MAPMAKER analysis of leaf culture data has revealed at least one chromosome region involved with CM and several with SR, the
29–30 region of chromosome 1 being common for the two traits. Root explants did not segregate for CM but several QTLs have
been detected for SR. The chromosome regions involved with leaf culture regeneration seem to be different from those of root
cultures, although the regeneration of abnormal shoots in leaf explants share two chromosome regions with the regeneration
of normal shoots in root cultures.
Received: 19 April 2000 / Accepted: 12 May 2000 相似文献
44.
45.
46.
47.
The authors' names were presented incorrectly making it appearthat there were three authors. The two authors' names are M.LucilaC.Acosta Pomar and Giovanni GiuffrÈ 相似文献
48.
Gloria Teijón Lucila Candela Ester Sagristá Manuela Hidalgo 《Soil & Sediment Contamination》2013,22(6):641-653
Adsorption/desorption processes (sorption isotherms) of Naproxen in a sandy aquifer matrix sediment were investigated using batch tests to compare Naproxen sorption behavior at 15°C and 25°C. Both temperatures are representative of the aquifer media and environmental conditions. Adsorption was well described by linear isotherms with low sorption affinity to aquifer material (Kd of 0.4 μg kg?1) at both temperatures (15°C and 25°C). Desorption isotherm coefficients at 15°C and 25°C were 5.0 and 4.9, respectively. Naproxen hysteresis indices were between 9.98 and 10.8, indicating that a Naproxen fraction may be irreversibly fixed in the aquifer media, being higher at 25°C (10.88) compared to 15°C, showing a decreasing trend with increasing compound concentration at 15°C. The low sorption of Naproxen leads to potential leaching to groundwater if present in irrigation water, and its prevalence in an aquifer media when directly injected in wells for groundwater recharge. 相似文献
49.
A. M. Figueiras M. T. González-Jaén M. Candela 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1990,79(5):686-692
Summary The spontaneous interchange polymorphism of rye cultivar Ailés is composed, as can be deduced from the chromosomal identification of the interchanges analyzed, of several different reciprocal translocations in which the chromosomes of its haploid complement are involved with a similar frequency, except for chromosomes 4R and 6R. Several features of chromosome behavior at metaphase I, such as configuration and orientation of quadrivalents and frequency of chiasmata, were analyzed in structural heterozygotes for different interchanges. The two main factors affecting the orientation of quadrivalents at metaphase I proved to be the morphology of these chromosome associations at metaphase I and, in particular, the frequency of bound chromosome arms that they showed. A genotypic control of alternate orientation of quadrivalents independent of chiasmata frequency was not detected. In addition, the frequency of alternate orientation shows no relation to the fitness. Possible evolutionary implications of the results obtained are discussed. 相似文献
50.
M. L. Ruíz J. Rueda M. I. Peláez F. J. Espino M. Candela A. M. Sendino A. M. Vázquez 《Plant Cell, Tissue and Organ Culture》1992,28(1):97-101
In vitro culture of immature embryo and young leaf tissues was carried out with five cultivars of barley, Hordeum vulgare. Two cultivars (Albacete and Porthos) responded poorly from both types of explants, while the three others (Dissa, Golden Promise and Ingrid) produced a high frequency of embryogenic callus from these explants (25–60%). For Dissa and Ingrid, young leaf explants were slightly better than immature embryo explants for embryogenic callus induction, while immature embryo cultures of Golden Promise responded better than young leaf explants. Thus, there appears to be a significant genotype × explant interaction in the initiation of embryogenic callus in barley.Some phenotypic variants were detected among the regenerated plants of Golden Promise and Ingrid, most originating by epigenetic changes. Only in one case was the variant phenotype heritable, probably due to a mutation in the chloroplast DNA. Mitotic alteractions were not detected. Consequently, somaclonal variation did not appear to be a very frequent event in plants regenerated from 1- to 6- month-old cultures of barley. 相似文献