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991.
Miquel Nadal María J. Clemente-Moreno Alicia V. Perera-Castro Margalida Roig-Oliver Yusuke Onoda Javier Gulías Jaume Flexas 《Ecology letters》2023,26(4):549-562
In recent years, attempts have been made in linking pressure–volume parameters and the leaf economics spectrum to expand our knowledge of the interrelationships among leaf traits. We provide theoretical and empirical evidence for the coordination of the turgor loss point and associated traits with net CO2 assimilation (An) and leaf mass per area (LMA). We measured gas exchange, pressure–volume curves and leaf structure in 45 ferns and angiosperms, and explored the anatomical and chemical basis of the key traits. We propose that the coordination observed between mass-based An, capacitance and the turgor loss point (πtlp) emerges from their shared link with leaf density (one of the components of LMA) and, specially, leaf saturated water content (LSWC), which in turn relates to cell size and nitrogen and carbon content. Thus, considering the components of LMA and LSWC in ecophysiological studies can provide a broader perspective on leaf structure and function. 相似文献
992.
C. Nadal 《Cell proliferation》1973,6(5):437-446
The subcutaneous injection of irritating substances to baby rats results in a very reproducible wave of synchronized S phase DNA synthesis in hepatic cell involving 20% of the total population. Use has been made of this reaction to detect factors affecting DNA synthesis in hepatic cells. It enables substances to be tested during precise periods of the cell cycle. Two activities which were detected in normal adult rat serum, could not be found in the serum of the baby rat or of the partially hepatectomized adult rat: an activity inhibiting the progression of hepatocytes through the cell cycle in the late G1 phase, and an activity inducing the production of binucleate hepatocytes, effective in the late G1 and in the S phase. 相似文献
993.
YAC and cosmid FISH mapping of an unbalanced chromosomal translocation causing partial trisomy 21 and Down syndrome 总被引:3,自引:0,他引:3
M. Nadal M. Milà Melanie Pritchard Antonio Mur Josep Pujals Jean-Louis Blouin Stylianos E. Antonarakis Francesca Ballesta X. Estivill 《Human genetics》1996,98(4):460-466
Most cases of Down syndrome (DS) result from a supernumerary chromosome 21; however, there are rare cases in which DS is
due to partial trisomy of chromosome 21, involving various segments of the chromosome. The characterization of cases of DS
that are due to partial trisomy 21 allows the phenotype to be correlated with the genotype. We present a case with features
of DS and a partial trisomy of chromosome 21 inherited from a paternal balanced translocation involving chromosomes 13 and
21. Fluorescence in situ hybridization analysis using yeast artificial chromosome (YAC) probes mapped the breakpoint to 21q22.1,
within YAC 230E8, which contains markers CBR, D21S333 and D21S334. Further mapping using cosmids positioned the breakpoint
proximal to CBR. The patient was also monosomic for the distal portion of chromosome 13 (q33–qter). Many phenotypic features
of DS were present including hypotonia, flat occiput, flat facies, up-slanted palpebral fissures, epicanthic folds, flat nasal
bridge, macroglossia, open mouth, small ears and a heart murmur. This case further supports the contention that the majority
of the phenotypic features of DS map to 21q22–qter and further refines the location of some of them. In addition to the DS
phenotype, the patient had a prominent upper maxilla with protruding upper incisors, and low levels of the coagulation factors
VII and X, consistent with a syndrome resulting from monosomy 13q33–qter. Since some features overlap between the two syndromes,
including severe mental retardation, it is unclear to what extent monosmy for 13q33–qter, trisomy for 21q22.1–qter, or a combination
of both, contributed to the common features of the phenotype.
Received: 27 March 1996 / Revised: 15 May 1996 相似文献