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11.
Abnormalities in the glycosylation of immunoglobulin heavy chain and an h-2 transplantation antigen in a mouse myeloma mutant. 总被引:4,自引:0,他引:4
Two mutant cell lines derived from the MPC-11 mouse myeloma synthesize immunoglobulin with abnormal heavy chains and normal light chains. The defective heavy chains have molecular weights of 38,000-42,000 (M3.11) and 50,000 daltons (ICR 11.19) as compared to 55,000 daltons of the wild-type. The glycosylation of the defective heavy chains demostrated several unusual features: first, 30-50% of the M3.11 heavy chain contained no carbonydrate, while 100% of the wildtype and ICR 11.19 heavy chains were glycosylated; second, the glycopeptides of the M3.11 heavy chains revealed an altered gel filtration pattern when compared with the wild-type; and third, digestion with an endoglycosidase indicated that the heterogeneity of the wild-type and M3.11 glycopeptides involved structural changes in the core region of the oligosaccharide. Examination of two other glycoproteins (the major histocompatibility complex antigens) in these cell lines showed that in M3.11, the H-2D but not the H-2K product was abnormally glycosylated and contained a smaller glycopeptide. However, in a subclone of M3.11 that had lost the ability to produce immunoglobulin heavy chains, the H-2D glycopeptide had returned to wild-type size. We concluded from these studies that the defective M3.11 immunoglobulin heavy chain interfered both with its own glycosylation and the glycosylation of another protein, H-2D. 相似文献
12.
SDS-acrylamide gel electrophoresis and its application to the proteins of poliovirus- and adenovirus-infected human cells 总被引:3,自引:0,他引:3
Sensitive techniques for acrylamide gel electrophoretic analysis have been applied to animal virus systems and have proven generally useful. Estimates of the number of kinds, molecular weights and number of molecules of proteins in almost any biological sample have been made with ease. As applied to the poliovirus-HeLa cell system they reveal four major proteins in the virion and at least ten additional proteins in the infected cell. Some of the intracellular and particulate proteins undergo cleavage reactions following a unique translation in which the genome is apparently translated in toto as one large polypeptide of molecular weight greater than 200,000 daltons. The splits occur at three levels: (a) during synthesis; (b) at intermediate stages; and (c) co-incident with maturation. In vitro studies on protein synthesis, RNA synthesis and virus assembly have substantiated and extended the in vivo observations. The structure of the adenovirion has been established in detail. Hexon, penton base, fiber and core polypeptides and certain relevant subviral structures have been identified. Nearly all of the proteins synthesized in the infected cells after 20 hours are viral. The major structural antigens (hexon and penton) predominate and are made in 10 to 50 fold excess but the internal core polypeptides are not produced in great excess. Studies on the synthesis of polypeptides and their assembly into morphological subunits and virions show that hexon and penton polypeptides are made in about four and two minutes respectively on cytoplasmic polyribosomes, that morphological subunits are formed within five minutes of synthesis of protein, and that there is a delay of greater than one half hour for entry of hexons into virions. 相似文献
13.
The spider tree of life: phylogeny of Araneae based on target‐gene analyses from an extensive taxon sampling
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Ward C. Wheeler Jonathan A. Coddington Louise M. Crowley Dimitar Dimitrov Pablo A. Goloboff Charles E. Griswold Gustavo Hormiga Lorenzo Prendini Martín J. Ramírez Petra Sierwald Lina Almeida‐Silva Fernando Alvarez‐Padilla Miquel A. Arnedo Ligia R. Benavides Silva Suresh P. Benjamin Jason E. Bond Cristian J. Grismado Emile Hasan Marshal Hedin Matías A. Izquierdo Facundo M. Labarque Joel Ledford Lara Lopardo Wayne P. Maddison Jeremy A. Miller Luis N. Piacentini Norman I. Platnick Daniele Polotow Diana Silva‐Dávila Nikolaj Scharff Tamás Szűts Darrell Ubick Cor J. Vink Hannah M. Wood Junxia Zhang 《Cladistics : the international journal of the Willi Hennig Society》2017,33(6):574-616
14.
Miquel A. Arnedo Gustavo Hormiga Nikolaj Scharff 《Cladistics : the international journal of the Willi Hennig Society》2009,25(3):231-262
This study infers the higher-level cladistic relationships of linyphiid spiders from five genes (mitochondrial CO1, 16S; nuclear 28S, 18S, histone H3) and morphological data. In total, the character matrix includes 47 taxa: 35 linyphiids representing the currently used subfamilies of Linyphiidae (Stemonyphantinae, Mynogleninae, Erigoninae, and Linyphiinae (Micronetini plus Linyphiini)) and 12 outgroup species representing nine araneoid families (Pimoidae, Theridiidae, Nesticidae, Synotaxidae, Cyatholipidae, Mysmenidae, Theridiosomatidae, Tetragnathidae, and Araneidae). The morphological characters include those used in recent studies of linyphiid phylogenetics, covering both genitalic and somatic morphology. Different sequence alignments and analytical methods produce different cladistic hypotheses. Lack of congruence among different analyses is, in part, due to the shifting placement of Labulla , Pityohyphantes , Notholepthyphantes , and Pocobletus . Almost all combined analyses agree on the monophyly of linyphioids, Pimoidae, Linyphiidae, Erigoninae, Mynogleninae, as well as Stemonyphantes as a basal lineage within Linyphiidae. Our results suggest independent origins of the desmitracheate tracheal system in micronetines and erigonines, and that erigonines were primitively haplotracheate. Cephalothoracic glandular specializations of erigonines and mynoglenines apparently evolved independently. Subocular sulci of mynoglenines and lateral sulci (e.g. Bathyphantes ) evolved independently but glandular pores in the prosoma proliferated once. The contribution of different character partitions and their sensitivity to changes in traditional analytical parameters is explored and quantified.
© The Willi Hennig Society 2009. 相似文献
© The Willi Hennig Society 2009. 相似文献
15.
Sarah Kiefer Christina Sommer Constance Scharff Silke Kipper Roger Mundry 《Journal of avian biology》2009,40(2):231-236
In many oscines, song repertoire size correlates with male quality and female mate choice, and can vary with age. In a cross-sectional field study in common nightingales Luscinia megarhynchos , one y old birds had substantially smaller repertoires than did older ones. In laboratory experiments males can acquire new song types during this period. This longitudinal field study therefore investigates whether individual nightingales increase their repertoires from the first to the second breeding season. We report a striking repertoire turnover, with an average overall increase of 24% of the first season's repertoire, resulting from added and dropped song types (54% and 30%, respectively). The number of added song types correlated positively with the size of the first season's repertoire. These results are consistent with the notion that repertoire size in nightingales correlates with male quality, although the overlap between repertoire sizes of first and second season birds makes it impossible to discriminate age based solely on repertoire size. Comparing the number of song types an individual sang in both seasons ('permanent song types') revealed a lower overlap than reported for subsequent seasons. The frequencies with which these were sung in the first season were less predictive of how often they were sung in the second season than was the case between later years. This drastic repertoire turnover from the first to the second season may be a selective process in response to the local song types, constrained by genetic makeup and shaped by early experience. 相似文献
16.
Miriam Ehrnthaler Lars B. Scharff Tobias T. Fleischmann Claudia Hasse Stephanie Ruf Ralph Bock 《The Plant cell》2014,26(2):765-776
Consistent with their origin from cyanobacteria, plastids (chloroplasts) perform
protein biosynthesis on bacterial-type 70S ribosomes. The plastid genomes of seed
plants contain a conserved set of ribosomal protein genes. Three of these have proven
to be nonessential for translation and, thus, for cellular viability:
rps15, rpl33, and rpl36. To
help define the minimum ribosome, here, we examined whether more than one of these
nonessential plastid ribosomal proteins can be removed from the 70S ribosome. To that
end, we constructed all possible double knockouts for the S15, L33, and L36 ribosomal
proteins by stable transformation of the tobacco (Nicotiana tabacum)
plastid genome. We find that, although S15 and L33 function in different ribosomal
particles (30S and 50S, respectively), their combined deletion from the plastid
genome results in synthetic lethality under autotrophic conditions. Interestingly,
the lethality can be overcome by growth under elevated temperatures due to an
improved efficiency of plastid ribosome biogenesis. Our results reveal functional
interactions between protein and RNA components of the 70S ribosome and uncover the
interdependence of the biogenesis of the two ribosomal subunits. In addition, our
findings suggest that defining a minimal set of plastid genes may prove more complex
than generally believed. 相似文献
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