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排序方式: 共有53条查询结果,搜索用时 15 毫秒
1.
Protein kinase NII and the regulation of rDNA transcription in mammalian cells 总被引:12,自引:1,他引:11
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P Belenguer V Baldin C Mathieu H Prats M Bensaid G Bouche F Amalric 《Nucleic acids research》1989,17(16):6625-6636
2.
Starvation-Induced Stress Resistance in Lactococcus lactis subsp. lactis IL1403 总被引:2,自引:1,他引:1
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Axel Hartke Sandrine Bouche Xavier Gansel Philippe Boutibonnes Yanick Auffray 《Applied microbiology》1994,60(9):3474-3478
Carbohydrate-starved cultures of Lactococcus lactis subsp. lactis IL1403 showed enhanced resistance to heat, ethanol, acid, osmotic, and oxidative stresses. This cross-protection seems to be established progressively during the transitional growth phase, with maximum resistance occurring when cells enter the stationary phase. Chloramphenicol or rifamycin treatment does not abolish the development of a tolerant cell state but, on the contrary, seems to provoke this response in L. lactis subsp. lactis. 相似文献
3.
Cossu G De Angelis L Borello U Berarducci B Buffa V Sonnino C Coletta M Vivarelli E Bouche M Lattanzi L Tosoni D Di Donna S Berghella L Salvatori G Murphy P Cusella-De Angelis MG Molinaro M 《The International journal of developmental biology》2000,44(6):699-706
In amniotes, myogenic commitment appears to be dependent upon signaling from neural tube and dorsal ectoderm, that can be replaced by members of the Wnt family and by Sonic hedgehog. Once committed, myoblasts undergo different fates, in that they can differentiate immediately to form the myotome, or later to give rise to primary and secondary muscle fibers. With fiber maturation, satellite cells are first detected; these cells contribute to fiber growth and regeneration during post-natal life. We will describe recent data, mainly from our laboratory, that suggest a different origin for some of the cells that are incorporated into the muscle fibers during late development. We propose the possibility that these myogenic cells are derived from the vasculature, are multi-potent and become committed to myogenesis by local signaling, when ingressing a differentiating muscle tissue. The implications for fetal and perinatal development of the whole mesoderm will also be discussed. 相似文献
4.
Amino acid changes S180A (S-->A at site 180), H197Y, Y277F, T285A, and
A308S are known to shift the maximum wavelength of absorption (lambda max)
of red and green visual pigments toward blue, essentially in an additive
fashion. To test the generality of this "five-sites" rule, we have
determined the partial amino acid sequences of red and green pigments from
five mammalian orders (Artiodactyla, Carnivora, Lagomorpha, Perissodactyla,
and Rodentia). The result suggests that cat (Felis catus), dog (Canis
familiaris), and goat (Capra hircus) pigments all with AHYTA at the five
critical sites have lambda max values of approximately 530 nm, whereas rat
(Rattus norvegicus) pigment with AYYTS has a lambda max value of
approximately 510 nm, which is accurately predicted by the five-sites rule.
However, the observed lambda max values of the orthologous pigments of
European rabbit (Oryctolagus cuniculus), white-tailed deer (Odocoileus
virginianus), gray squirrel (Sciurus carolinensis), and guinea pig (Cavia
procellus) are consistently more than 10 nm higher than the predicted
values, suggesting the existence of additional molecular mechanisms for red
and green color vision. The inferred amino acid sequences of ancestral
organisms suggest that the extant mammalian red and green pigments appear
to have evolved from a single ancestral green-red hybrid pigment by
directed amino acid substitutions.
相似文献
5.
Soulet F Bailly K Roga S Lavigne AC Amalric F Bouche G 《The Journal of biological chemistry》2005,280(27):25604-25610
Fibroblast growth factor 2 (FGF-2) has been detected in the nuclei of many tissues and cell lines. Here we demonstrate that FGF-2 added exogenously to NIH3T3 cells enters the nucleus and interacts with the nuclear active 90-kDa ribosomal S6 kinase 2 (RSK2) in a cell cycle-dependent manner. By using purified proteins, FGF-2 is shown to directly interact through two separate domains with two RSK2 domains on both sides of the hydrophobic motif, namely the NH2-terminal kinase domain (residues 360-381) by amino acid Ser-117 and the COOH-terminal kinase domain (residues 388-400) by amino acids Leu-127 and Lys-128. Moreover, this interaction leads to maintenance of the sustained activation of RSK2 in G1 phase of the cell cycle. FGF-2 mutants (FGF-2 S117A, FGF-2 L127A, and FGF-2 K128A) that fail to interact in vitro with RSK2 fail to maintain a sustained RSK2 activity in vivo. 相似文献
6.
Thiago?GazoniEmail author Simone?L?Gruber Ana?PZ?Silva Olivia?GS?Araújo Hideki?Narimatsu Christine?Strüssmann Célio?FB?Haddad Sanae?Kasahara 《BMC genetics》2012,13(1):109
Background
The karyotypes of Leptodactylus species usually consist of 22 bi-armed chromosomes, but morphological variations in some chromosomes and even differences in the 2n have been reported. To better understand the mechanisms responsible for these differences, eight species were analysed using classical and molecular cytogenetic techniques, including replication banding with BrdU incorporation.Results
Distinct chromosome numbers were found: 2n = 22 in Leptodactylus chaquensis, L. labyrinthicus, L. pentadactylus, L. petersii, L. podicipinus, and L. rhodomystax; 2n = 20 in Leptodactylus sp. (aff. podicipinus); and 2n = 24 in L. marmoratus. Among the species with 2n = 22, only three had the same basic karyotype. Leptodactylus pentadactylus presented multiple translocations, L. petersii displayed chromosome morphological discrepancy, and L. podicipinus had four pairs of telocentric chromosomes. Replication banding was crucial for characterising this variability and for explaining the reduced 2n in Leptodactylus sp. (aff. podicipinus). Leptodactylus marmoratus had few chromosomes with a similar banding patterns to the 2n = 22 karyotypes. The majority of the species presented a single NOR-bearing pair, which was confirmed using Ag-impregnation and FISH with an rDNA probe. In general, the NOR-bearing chromosomes corresponded to chromosome 8, but NORs were found on chromosome 3 or 4 in some species. Leptodactylus marmoratus had NORs on chromosome pairs 6 and 8. The data from C-banding, fluorochrome staining, and FISH using the telomeric probe helped in characterising the repetitive sequences. Even though hybridisation did occur on the chromosome ends, telomere-like repetitive sequences outside of the telomere region were identified. Metaphase I cells from L. pentadactylus confirmed its complex karyotype constitution because 12 chromosomes appeared as ring-shaped chain in addition to five bivalents.Conclusions
Species of Leptodactylus exhibited both major and minor karyotypic differences which were identified by classical and molecular cytogenetic techniques. Replication banding, which is a unique procedure that has been used to obtain longitudinal multiple band patterns in amphibian chromosomes, allowed us to outline the general mechanisms responsible for these karyotype differences. The findings also suggested that L. marmoratus, which was formerly included in the genus Adenomera, may have undergone great chromosomal repatterning.7.
Background
Routine antibiotic prophylaxis following snakebite is not recommended but evidence suggests that it may be common practice in Zimbabwe. This study set out to determine and describe the extent of this practice at Parirenyatwa Hospital, a large teaching hospital in Zimbabwe 相似文献8.
9.
Pütz MM Bouche FB de Swart RL Muller CP 《International journal for parasitology》2003,33(5-6):525-545
Vaccination with the current live attenuated measles vaccine is one of the most successful and cost-effective medical interventions. However, as a result of persisting maternal antibodies and immaturity of the infant immune system, this vaccine is poorly immunogenic in children <9 months old. Immunity against the live vaccine is less robust than natural immunity and protection less durable. There may also be some concern about (vaccine) virus spread during the final stage of an eventual measles eradication program. Opinions may differ with respect to the potential threat that some of these concerns may be to the World Health Organisation goal of measles elimination, but there is a consensus that the development of new measles vaccines cannot wait. Candidate vaccines are based on viral or bacterial vectors expressing recombinant viral proteins, naked DNA, immune stimulating complexes or synthetic peptides mimicking neutralising epitopes. While some of these candidate vaccines have proven their efficacy in monkey studies, aerosol formulated live attenuated measles vaccine are evaluated in clinical trials. 相似文献
10.