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131.
Takafuji Yoshinori Shimizu-Sato Sae Ta Kim Nhung Suzuki Toshiya Nosaka-Takahashi Misuzu Oiwa Tetsuro Kimura Wakana Katoh Hirokazu Fukai Mao Takeda Shin Sato Yutaka Hattori Tsukaho 《Journal of plant research》2021,134(5):1061-1081
Journal of Plant Research - The major tissues of the cereal endosperm are the starchy endosperm (SE) in the inner and the aleurone layer (AL) at the outer periphery. The fates of the cells that... 相似文献
132.
133.
Lee HS Chang JH Ku SK 《Folia histochemica et cytobiologica / Polish Academy of Sciences, Polish Histochemical and Cytochemical Society》2010,48(3):387-393
The regional distribution and frequency of the pancreatic endocrine cells in the ddN mouse were studied using specific antisera against insulin, glucagon, somatostatin and human pancreatic polypeptide (hPP). In the pancreatic islets, most of insulin-immunoreactive (IR) cells were located in the central region, and glucagon-, somatostatin and hPP-IR cells were located in the peripheral region regardless of the lobe. In the splenic part, glucagon-IR cells were also located in the central regions, and more numerous somatostatin-IR cells were detected in the central regions as compared with the duo-denal part. hPP-IR cells were restricted to the peripheral regions in both lobes but more numerous cells were detected in the duodenal portion. In the exocrine parenchyma of the splenic lobe, only insulin- and glucagon-IR cells were detected but all four kinds of IR cells were observed in the duodenal portion. In addition, insulin and hPP-IR cells were also demonstrated in the pancreatic duct regions. In conclusion, some strain-dependent characteristic distributional patterns of pancreatic endocrine cells were found in the ddN mouse with somewhat different distributional patterns between the two pancreatic lobes. 相似文献
134.
Shota Sawake Noriaki Tajima Jenny C. Mortimer Jeemeng Lao Toshiki Ishikawa Xiaolan Yu Yukiko Yamanashi Yoshihisa Yoshimi Maki Kawai-Yamada Paul Dupree Yoichi Tsumuraya Toshihisa Kotake 《The Plant cell》2015,27(12):3397-3409
Humans are unable to synthesize l-ascorbic acid (AsA), yet it is required as a cofactor in many critical biochemical reactions. The majority of human dietary AsA is obtained from plants. In Arabidopsis thaliana, a GDP-mannose pyrophosphorylase (GMPP), VITAMIN C DEFECTIVE1 (VTC1), catalyzes a rate-limiting step in AsA synthesis: the formation of GDP-Man. In this study, we identified two nucleotide sugar pyrophosphorylase-like proteins, KONJAC1 (KJC1) and KJC2, which stimulate the activity of VTC1. The kjc1kjc2 double mutant exhibited severe dwarfism, indicating that KJC proteins are important for growth and development. The kjc1 mutation reduced GMPP activity to 10% of wild-type levels, leading to a 60% reduction in AsA levels. On the contrary, overexpression of KJC1 significantly increased GMPP activity. The kjc1 and kjc1kjc2 mutants also exhibited significantly reduced levels of glucomannan, which is also synthesized from GDP-Man. Recombinant KJC1 and KJC2 enhanced the GMPP activity of recombinant VTC1 in vitro, while KJCs did not show GMPP activity. Yeast two-hybrid assays suggested that the stimulation of GMPP activity occurs via interaction of KJCs with VTC1. These results suggest that KJCs are key factors for the generation of GDP-Man and affect AsA level and glucomannan accumulation through the stimulation of VTC1 GMPP activity. 相似文献
135.
136.
Jin Hao Kim Hak Sung Yu Seung Taek Shin Sae Ron Lee Sung Hee Seo Geom Seog 《Molecular biology reports》2021,48(2):1171-1180
Molecular Biology Reports - A large body of research has demonstrated a synergistic anticancer effect between docosahexaenoic acid (DHA) and standard chemotherapy regimens against colorectal cancer... 相似文献
137.
Min SH Cho JS Oh JH Shim SB Hwang DY Lee SH Jee SW Lim HJ Kim MY Sheen YY Lee SH Kim YK 《Neurochemical research》2005,30(8):955-961
Pin1 binds mitotically phosphorylated Thr231–Pro232 and Thr212–Pro213 sites on tau, and a Pin1 deficiency in mice leads to
tau hyperphosphorylation. The aim of this study was to determine if the dephosphorylation or inhibition of tau and GSK3β phosphorylation
induces the Pin1 phosphorylation. To test this, human SK-N-MC cells were stably transfected with a fusion gene containing
neuron-specific enolase (NSE)-controlled APPsw gene(NSE/APPsw), to induce Aβ-42. The stable transfectants were then transiently transfected with NSE/Splice, lacking human tau (NSE/Splice), or NSE/hTau, containing human tau, into the cells. The NSE/Splice- and NSE/hTau-cells were then treated with lithium. We concluded that (i) there was more C99-β APP accumulation than C83-βAPP in APPsw-tansfectant
and thereby promoted Aβ-42 production in transfectants. (ii) the inhibition of tau and GSK3β phosphorylations correlated with
increase in Pin1 activation in NSE/hTau- cells. Thus, these observations suggest that Pin1 might have an inhibitive role in phosphorylating tau and GSK3β for protecting
against Alzheimer’s disease. 相似文献
138.
Differential expression pattern of C4 bundle sheath expression genes in rice, a C3 plant 总被引:2,自引:0,他引:2
Nomura M Higuchi T Ishida Y Ohta S Komari T Imaizumi N Miyao-Tokutomi M Matsuoka M Tajima S 《Plant & cell physiology》2005,46(5):754-761
NADP-malic enzyme (NADP-ME) and phosphoenolpyruvate carboxykinase(PCK) are specifically expressed in bundle sheath cells (BSCs)in NADP-ME-type and PCK-type C4 plants, respectively. Unlikethe high activities of these enzymes in the green leaves ofC4 plants, their low activities have been detected in the leavesof C3 plants. In order to elucidate the differences in the geneexpression system between C3 and C4 plants, we have producedchimeric constructs with the ß-glucuronidase (GUS)reporter gene under the control of the maize NADP-Me (ZmMe)or Zoysia japonica Pck (ZjPck) promoter and introduced theseconstructs into rice. In leaves of transgenic rice, the ZmMepromoter directed GUS expression not only in mesophyll cells(MCs) but also in BSCs and vascular cells, whereas the ZjPckpromoter directed GUS expression only in BSCs and vascular cells.Neither the ZjPck nor ZmMe promoters induced GUS expressiondue to light. In rice leaves, the endogenous NADP-Me (OsMe1)was expressed in MCs, BSCs and vascular cells, whereas the ricePck (OsPck1) was expressed only in BSCs and vascular cells.Taken together, the results obtained from transgenic rice demonstratethat the expression pattern of ZmMe or ZjPck in transgenic ricewas reflected by that of its counterpart gene in rice. (Received August 8, 2004; Accepted February 20, 2005
) 相似文献
139.
Kameshita I Nishida T Nakamura S Sugiyama Y Sueyoshi N Umehara Y Nomura M Tajima S 《Journal of biochemistry》2005,137(1):33-39
To investigate protein kinases expressed in Lotus japonicus, a cDNA expression library of the root-nodule of L. japonicus was immunologically screened with monoclonal antibodies directed to a highly conserved region in protein serine/threonine kinases (Ser/Thr kinases). Among 178 positive clones obtained from the lambdaZAPII cDNA library, 164 clones were found to encode novel proteins possessing the subdomain VIB sequences characteristic of Ser/Thr kinases. By phylogenetic analysis on the basis of deduced amino acid sequences, the isolated clones could be classified into five different families of Ser/Thr kinases : the SnRK family, GSK-3 family, Ndr kinase family, Ark family, and receptor kinase family. These results suggest that this expression cloning using the kinase-specific antibodies will provide new clues for investigations of a wide variety of known and novel protein kinases in higher plants. 相似文献
140.
Zhang Z Tsujimura M Akutsu J Sasaki M Tajima H Kawarabayasi Y 《The Journal of biological chemistry》2005,280(10):9698-9705
L-rhamnose is an essential component of the cell wall and plays roles in mediating virulence and adhesion to host tissues in many microorganisms. Glucose-1-phosphate thymidylyltransferase (RmlA, EC 2.7.7.24) catalyzes the first reaction of the four-step pathway of L-rhamnose biosynthesis, producing dTDP-D-glucose from dTTP and glucose-1-phosphate. Three RmlA homologues of varying size have been identified in the genome of a thermophilic archaeon, Sulfolobus tokodaii strain 7. In this study, we report the heterologous expression of the largest homologue (a 401 residue-long ST0452 protein) and characterization of its thermostable activity. RmlA enzymatic activity of this protein was detected from 65 to 100 degrees C, with a half-life of 60 min at 95 degrees C and 180 min at 80 degrees C. Analysis of a deletion mutant lacking the 170-residue C-terminal domain indicated that this region has an important role in the thermostability and activity of the protein. Analyses of substrate specificity indicated that the enzymatic activity of the full-length protein is capable of utilizing alpha-D-glucose-1-phosphate and N-acetyl-D-glucosamine-1-phosphate but not alpha-D-glucosamine-1-phosphate. However, the protein is capable of utilizing all four deoxyribonucleoside triphosphates and UTP. Thus, the ST0452 protein is an enzyme containing both glucose-1-phosphate thymidylyltransferase and N-acetyl-D-glucosamine-1-phosphate uridylyltransferase activities. This is the first report of a thermostable enzyme with dual sugar-1-phosphate nucleotidylyltransferase activities. 相似文献