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181.
Production of Pyrroloquinoline Quinone by Using Methanol-Utilizing Bacteria 总被引:1,自引:0,他引:1
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Teizi Urakami Kazuya Yashima Hisao Kobayashi Akio Yoshida Chieko Ito-Yoshida 《Applied microbiology》1992,58(12):3970-3976
A large number of methanol-utilizing bacteria were screened for extracellular production of pyrroloquinoline quinone (PQQ) by using methanol as the carbon and energy sources. Of the bacteria selected, Hyphomicrobium sp. strain TK 0441 was examined for PQQ production by using a jar fermentor. The amount of PQQ in the broth and the level of methanol dehydrogenase activity in the cells were increased by simply decreasing the amount of Fe added to the medium. On the other hand, extracellularly produced protein which interfered with the purification of PQQ was decreased by simply increasing the amount of Mg added to the medium. A suitable medium that contained 1 μg of Fe per ml, 150 μg of Mg per ml, and trace elements was developed. In this medium, the production of PQQ reached approximately 1 mg/ml and protein formation was low. 相似文献
182.
M Hayakawa Y Abiko T Ito H Sasahara H Yamano H Takiguchi 《The International journal of biochemistry》1992,24(6):945-950
1. Porphyromonas gingivalis is believed an important pathogen of adult periodontitis. A gene library of P. gingivalis 381 was constructed in lambda phage vector L47.1. The library was probed with serum obtained from patients of severe adult periodontitis. Two clones, lambda MDBG101 and lambda MDBG103 which were expressed, 200 and 160 kDa respectively, were selected and further studied. 2. The expressed antigens in these two clones were also reacted with rabbit antiserum against whole cells, capsular fraction and cell surface fraction of P. gingivalis. 3. Genes coding protein antigens in lambda MDBG101 and lambda MDBG103 were subcloned into high-copy-number plasmid vector pACYC184 and subclones obtained were designated as MD101 and MD103. Recombinant plasmids, pMD101 and pMD103, differed in their restriction endonuclease digestion. 4. Immunodiffusion analysis showed that cloned proteins from MD101 and MD103 reacted with antiserum against P. gingivalis but did not react with antiserum against Prevotella intermedia, Prevotella loescheii and Prevotella asaccharolyticus. 5. These data suggest that P. gingivalis species-specific antigens has been successfully cloned and expressed in Escherichia coli. Since these cloned specific antigens were recognized by adult periodontitis patient sera, the recombinant antigen will be useful material for the development of serodiagnosis of P. gingivalis infection in adults periodontitis. 相似文献
183.
Kazuo Ichihara Kiminobu Yamamoto Yasushi Abiko 《Molecular and cellular biochemistry》1993,119(1-2):133-141
Effects of iloprost, which is a stable prostacyclin analogue, on the ischemic myocardium were examined in the open-chest dog heart, in terms of biochemical parameters. Ischemia was initiated by ligating the left anterior descending coronary artery. When the coronary artery was ligated for 3 min, the levels or glycogen, fructose-1,6-diphosphate (FDP), adenosine triphosphate and creatinephosphate decreased, and the levels of glucose-6-phosphate (G6P), fructose-6-phosphate (F6P), lactate, adenosine diphosphate and adenosine monophosphate increased. During ischemia, therefore, energy charge potential was significantly decreased from 0.89±0.01 to 0.82±0.01, and ([G6P]+[F6P])/[FDP] and [lactate]/[pyruvate] ratios were significantly increased from 1.75±0.30 to 29.05±5.70 and 13±3 to 393±112, respectively. Iloprost (0.1, 0.3, or 1 g·kg–1) was injected intravenously 5 min before the onset of ischemia. Iloprost (0.1, 0.3, and 1 g·kg–1) reduced the ischemia-induced decrease in energy charge potential to 94, 74, and 86%, respectively, the increase in ([G6P]+[F6P]/[FDP] to 38, 29, 32%, respectively, and the increase in [lactate]/[pyruvate] to 67, 45, 65%, respectively. These results suggest that iloprost lessens the myocardial metabolic derangements produced by ischemia, and the most potent effect was obtained at the dose of 0.3 g·kg–1. 相似文献
184.
185.
A 718-kb DNA Sequence of the Escherichia coli K-12 Genome Corresponding to the 12.7-28.0 min Region on the Linkage Map 总被引:3,自引:0,他引:3
Oshima Taku; Aiba Hiroji; Baba Tomoya; Fujita Katsutoshi; Hayashi Kouji; Honjo Atsuko; Ikemoto Keiichi; Inada Toshifumi; Itoh Takeshi; Kajihara Miwako; Kanai Kiyotaka; Kashimoto Kaoru; Kimura Shigenobu; Kitagawa Masanari; Makino Kouzou; Masuda Shinji; Miki Takeyoshi; Mizobuchi Kiyoshi; Mori Hirotada; Motomura Kouji; Nakamura Yoshikazu; Nashimoto Hiroko; Nishio Yoshitaka; Saito Noriko; Sampei Gen-ichi; Seki Yasushi; Tagami Hideaki; Takemoto Keiko; Wada Chieko; Yamamoto Yoshihiro; Yano Minoru; Horiuchi Takashi 《DNA research》1996,3(3):137-155
The 718,122 base pair (bp) sequence of the Escherichia coliK-12 genome corresponding to the region from 12.7 to 28.0 minuteson the genetic map is described. This region contains at least682 potential open reading frames, of which 278 (41%) have beenpreviously identified, 147 (22%) were homologous to other knowngenes, 138 (20%) are identical or similar to the hypotheticalgenes registered in databases, and the remaining 119 (17%) didnot show a significant similarity to any other gene. In thisregion, we assigned a cluster of cit genes encoding multienzymecitrate lyase, two clusters of fimbrial genes and a set of lysogenicphage genes encoding integrase, excisionase and repressor inthe e14 genetic element. In addition, a new valine tRNA gene,designated valZ, and a family of long directly repeated sequences,LDR-A, -B and -C, were found. 相似文献
186.
Clustered Genes for Galactose Metabolism from Streptococcus mutans Cloned in Escherichia coli 总被引:6,自引:4,他引:2
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Maryla Smorawinska J. Charles Hsu Jeffrey B. Hansen E. Katarzyna Jagusztyn-Krynicka Yoshimitsu Abiko Roy Curtiss III 《Journal of bacteriology》1983,153(2):1095-1097
DNA cloned into Escherichia coli from a serotype c strain of Streptococcus mutans allowed a galKTE mutant to utilize galactose for growth. However, the DNA does not appear to encode enzymes of the Leloir pathway used by E. coli, but rather appears to encode enzymes of the tagatose phosphate pathway. 相似文献
187.
Toshiharu Oba Chieko Kurono Ritsuko Nakajima Tetsuo Takaishi Kazuto Ishida Geraldine A Fuller Wuthichai Klomkleaw Mamoru Yamaguchi 《Journal of applied physiology》2002,93(6):1999-2008
We studied whether hydrogen peroxide (H(2)O(2)) at =10 microM activates the ryanodine receptor and decreases releasable Ca(2+) content in the sarcoplasmic reticulum after fatigue. Exposure of rabbit or frog skeletal muscle ryanodine receptors to 10 microM H(2)O(2) enhanced channel activity in lipid bilayers when the redox potential was defined at cis = -220 mV and trans = -180 mV. Channel activation by 10 microM H(2)O(2) was also observed when cis potential was set at -220 mV without defining trans potential, but the effect was less. Reduction of trans redox potential from -180 to -220 mV did not alter channel activity. H(2)O(2) at 500 microM failed to activate the channel when the redox potential was not controlled. Stimulation of the frog muscle fiber for 2 min (50 Hz, a duty cycle of 200 ms/s) decreased tetanus tension by approximately 50%. After 1 min, tetanus recovered rapidly to approximately 70% of control and thereafter slowly approached the control level. Amplitudes of caffeine- and 4-chloro-m-cresol-induced contractures were decreased after a 60-min rest. The decrease is not enhanced by exposure to 10 microM H(2)O(2). These results suggest that H(2)O(2) markedly activates the ryanodine receptor under the redox control in vitro, but externally applied H(2)O(2) may not play an important role in the postfatigue recovery process. 相似文献
188.
Takashi Wakabayashi Chieko Kurono Masahisa Asano Hiroshi Kimura Takayuki Ozawa 《Journal of bioenergetics and biomembranes》1976,8(1):55-71
Microsomes were obtained from the zona glomerulosa of the bovine adrenal cortex. Contamination of microsomes with other cellular organelles was examined using various marker enzymes and the electron microscope. Distribution of cytochrome P-450 in the zona glomerulosa was studied using various fractions including microsomes, described above, and mitochondria. The amount of cytochrome P-450 in mitochondria and in microsomes was determined to be 0.73 and 0.32 nmol/mg protein, respectively. The CO difference spectrum was affected not only by the concentration of added deoxycholate but also by the incubation time after addition. Approximately 40–50% of cytochrome P-450 in the samples was converted to cytochrome P-420 within 20–30 sec of incubation with deoxycholate.The content of RNA, phospholipids, and cytochromeb
5 in microsomes obtained from the zona glomerulosa is also evaluated in comparison to that in microsomes obtained from the zona fasciculoreticularis. 相似文献
189.
H Kumagai T Abiko C Ono Y Marumo S Enomoto K Igarashi S Hirose 《Biochimica et biophysica acta》1985,827(3):424-430
An endoribonuclease has been purified nearly to homogeneity from rat liver microsomes, and its mode of action and general properties were studied. The enzyme had an apparent molecular weight of 58 000, as estimated by both gel filtration and SDS-polyacrylamide gel electrophoresis and produced oligonucleotides from poly(A), poly(U) and poly(C). No mononucleotide was obtained by the enzymatic hydrolysis of the above substrates. The enzyme made endonucleolytic cleavages which generated 5'-phosphate-terminated oligonucleotides. It was suggested that the existence of at least (Ado5'P)2 residues at both sides of the cleavage bond was necessary for the action of the endoribonuclease. Divalent cations (Mg2+ or Mn2+) were required for the enzymatic activity, while K+ inhibited the enzyme. Spermine stimulated the enzymatic activity in the presence of 1 mM Mg2+. 相似文献
190.
Takashi Abiko Mihoko Kumikawa Hiroki Higuchi Hiroshi Sekino 《Biochemical and biophysical research communications》1978,84(1):184-194
A heptapeptide isolated from uremic fluid was synthesized by conventional method. The total amino acid sequence of this peptide was deduced as follows: H-His-Pro-Ala-Glu-Asn-Gly-Lys-OH. Structural similarity was soon realized between this peptide and heptapeptde moiety corresponding to position 13 through 19 of β2-microglobulin. 相似文献