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121.
K van Oers A W Santure I De Cauwer N EM van Bers R PMA Crooijmans B C Sheldon M E Visser J Slate M AM Groenen 《Heredity》2014,112(3):307-316
Linking variation in quantitative traits to variation in the genome is an important, but
challenging task in the study of life-history evolution. Linkage maps provide a valuable
tool for the unravelling of such trait−gene associations. Moreover, they give
insight into recombination landscapes and between-species karyotype evolution. Here we
used genotype data, generated from a 10k single-nucleotide polymorphism (SNP) chip, of
over 2000 individuals to produce high-density linkage maps of the great tit (Parus
major), a passerine bird that serves as a model species for ecological and
evolutionary questions. We created independent maps from two distinct populations: a
captive F2-cross from The Netherlands (NL) and a wild population from the United Kingdom
(UK). The two maps contained 6554 SNPs in 32 linkage groups, spanning 2010 cM and
1917 cM for the NL and UK populations, respectively, and were similar in size and
marker order. Subtle levels of heterochiasmy within and between chromosomes were
remarkably consistent between the populations, suggesting that the local departures from
sex-equal recombination rates have evolved. This key and surprising result would have been
impossible to detect if only one population was mapped. A comparison with zebra finch
Taeniopygia guttata, chicken Gallus gallus and the green anole lizard
Anolis carolinensis genomes provided further insight into the evolution of
avian karyotypes. 相似文献
122.
123.
Protective effect exerted by soil phosphorus on soybean subjected to arsenic and fluoride 总被引:1,自引:0,他引:1
Carolina Bustingorri Guillermo Noriega Raúl S. Lavado 《Redox report : communications in free radical research》2017,22(6):353-360
Objetive: Arsenic (As) and fluoride (F) are found in groundwater and soils around the world, causing different problems to crops. Because these elements compete against phosphorus (P) in soils and plants, their relationship is complex. The aim of this work was to study the oxidative stress of soybean plants subjected to different concentrations of As and F, and the effect of P.Methods: The following 10 treatments were carried out in each of two soils with different P content: three As levels (low 10?mg?As?kg-1, medium 50?mg?As?kg?1 and high 100?mg As kg?1), three F levels (low 160?mg?F?kg?1, medium 250?mg?F?kg?1 and high 500?mg?F?kg?1) and three As?+?F levels (same concentrations), and the control treatment (soil with the background As and F concentrations) Lipid peroxidation, chlorophyll, gluthatione contents and antioxidant enzymes activities were determination.Results: Increased lipid peroxidation and alterations in glutathione content, catalase, superoxide dismutase and peroxidase activities as well as in chlorophyll content revealed that As causes higher oxidative stress in plants grown in soils with low P content.Conclusion: Stress parameters in F treatments were less affected. Plants grown in soils enriched with P revealed a decrease in the toxic effects caused by As and F. 相似文献
124.
125.
Alice Barbaglio Anna Biressi Giulio Melone Francesco Bonasoro Ramón Lavado Cinta Porte M. Daniela Candia Carnevali 《Zoomorphology》2009,128(2):119-134
Gonads of the mediterranean crinoid Antedon mediterranea were analyzed in order to reconstruct their histological organization. The tissue arrangement resembled that previously described
in other crinoids. Five reproductive stages were identified in both males and females: recovery, growing, premature, mature,
spent. Sexually dimorphic characters were observed at the gonopore level. Hermaphroditic individuals were never detected.
There were novel findings concerning somatic accessory cells of the gonads. The reproductive cycle periodicity was indicated
by analysis of reproductive stage frequencies in the period 2003–2005: spring and winter were the seasons with highest and
lowest maturity levels, respectively. A role in the regulation of reproduction was hypothesized for testosterone and 17β-estradiol,
which were found to be present in A. mediterranea tissues and to vary during the reproductive cycle, thus suggesting a correlation between steroid levels and morphologically
recognizable reproductive stages. 相似文献
126.
127.
Marieke Biegstraaten Ivo N van Schaik Wouter Wieling Frits A Wijburg Carla EM Hollak 《BMC neurology》2010,10(1):38