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901.
Hauser LJ Land ML Brown SD Larimer F Keller KL Rapp-Giles BJ Price MN Lin M Bruce DC Detter JC Tapia R Han CS Goodwin LA Cheng JF Pitluck S Copeland A Lucas S Nolan M Lapidus AL Palumbo AV Wall JD 《Journal of bacteriology》2011,193(16):4268-4269
Desulfovibrio alaskensis G20 (formerly Desulfovibrio desulfuricans G20) is a Gram-negative mesophilic sulfate-reducing bacterium (SRB), known to corrode ferrous metals and to reduce toxic radionuclides and metals such as uranium and chromium to sparingly soluble and less toxic forms. We present the 3.7-Mb genome sequence to provide insights into its physiology. 相似文献
902.
Deiana M Incani A Rosa A Atzeri A Loru D Cabboi B Paola Melis M Lucas R Morales JC Assunta Dessì M 《Chemico-biological interactions》2011,(3):232-239
Hydroxytyrosol (2-(3′,4′-dihydroxyphenyl)ethanol; HT), the most active ortho-diphenolic compound, present either in free or esterified form in extravirgin olive oil, is extensively metabolized in vivo mainly to O-methylated, O-sulfated and glucuronide metabolites. We investigated the capacity of three glucuronide metabolites of HT, 3′-O-β-d-glucuronide and 4′-O-β-d-glucuronide derivatives and 2-(3′,4′-dihydroxyphenyl)ethanol-1-O-β-d-glucuronide, in comparison with the parent compound, to inhibit H2O2 induced oxidative damage and cell death in LLC-PK1 cells, a porcine kidney epithelial cell line. H2O2 treatment exerted a toxic effect inducing cell death, interacting selectively within the pro-death extracellular-signal relate kinase (ERK 1/2) and the pro-survival Akt/PKB signaling pathways. It also produced direct oxidative damage initiating the membrane lipid peroxidation process. None of the tested glucuronides exhibited any protection against the loss in renal cell viability. They also failed to prevent the changes in the phosphorylation states of ERK and Akt, probably reflecting their inability to enter the cells, while HT was highly effective. Notably, pretreatment with glucuronides exerted a protective effect at the highest concentration tested against membrane oxidative damage, comparable to that of HT: the formation of malondialdehyde, fatty acid hydroperoxides and 7-ketocholesterol was significantly inhibited. 相似文献
903.
The oxaloacetate decarboxylase primary Na(+) pump (OAD) is an essential membrane protein complex that functions in the citrate fermentation pathway of some pathogenic bacteria under anaerobic conditions. OAD contains three different subunits: Oad-α, a biotinylated extrinsic protein that catalyzes the α-ketodecarboxylation of oxaloacetate; Oad-γ, a structural bitopic membrane protein whose cytosolic tail (named as Oad-γ') binds tightly to Oad-α; and Oad-β, a multispan transmembrane α-helical protein that constitutes the Na(+) channel. How OAD is organized structurally at the membrane and what the molecular determinants are that lead to an efficient energy coupling mechanism remain elusive. In the present work, we elucidate the stoichiometry of the native complex as well as the low resolution structure of the peripheral components of OAD (Oad-α and Oad-γ') by small angle x-ray scattering. Our results point to a quaternary assembly similar to the pyruvate carboxylase complex organization. Herein, we propose a model in which the association in pairs of Oad-α dimers, mediated by Oad-γ, results in the acquisition of a functional oligomeric state at the bacterial membrane. New structural insights for the conformational rearrangements associated with the carboxylbiotin transfer reaction within OAD are provided. 相似文献
904.
Daane KM Middleton MC Sforza R Cooper ML Walton VM Walsh DB Zaviezo T Almeida RP 《Environmental entomology》2011,40(6):1595-1603
A simple molecular tool was developed and tested to identify seven mealybug species found in North American vineyards: Pseudococcus maritimus Ehrhorn, Pseudococcus viburni (Signoret), Pseudococcus longispinus (Targioni-Tozzeti), Pseudococcus calceolariae (Maskell), Planococcus ficus (Signoret), Planococcus citri (Risso), and Ferrisia gilli Gullan. The developed multiplex PCR is based on the mitochondrial cytochrome c oxidase subunit one gene. In tests, this single-step multiplex PCR correctly identified 95 of 95 mealybug samples, representing all seven species and collected from diverse geographic regions. To test the sensitivity, single specimen samples with different Pl. ficus developmental stages (egg to adult female and adult male) were processed PCR and the resulting output provided consistent positive identification. To test the utility of this protocol for adult males caught in sex baited pheromone traps, Pl. ficus adult males were placed in pheromone traps, aged at a constant temperature of 26±2°C, and processed with the multiplex each day thereafter for 8 d. Results showed consistent positive identification for up to 6 d (range, 6-8 d). Results are discussed with respect to the usefulness of this molecular tool for the identification of mealybugs in pest management programs and biosecurity of invasive mealybugs. 相似文献
905.
Fiorentino A D'Abrosca B Pacifico S Scognamiglio M D'Angelo G Gallicchio M Chambery A Monaco P 《Phytochemistry》2011,72(16):2037-2044
Seven neo-clerodanes (teupolins VI–XII) and eleven known compounds were isolated and characterized from leaf extracts of Teucrium polium L., a medicinal plant used in traditional and herbal medicine for its hypolipidemic, hypoglycemic, antioxidant and antiproliferative properties. The structures of these compounds were elucidated by 1D (1H, 13C and DEPT) and 2D (COSY, TOCSY, HSQC, HMBC) NMR experiments and by mass spectrometry analysis. The complete stereostructure of each compound was defined with a NOESY experiment. Because the overexploitation of herbal remedies containing T. polium extracts has resulted in several cases of hepatitis, the hepatotoxic activity of pure metabolites against the human hepatoblastoma cancer cell line HepG2 was assessed by the MTT (3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide) test. All of the compounds showed low toxicity values at the highest concentration tested (200 μM). 相似文献
906.
Sugarcane is a highly productive crop plant with the capacity of storing large amounts of sucrose. Sucrose accumulation in
the stem of sugarcane has been studied extensively. The initial recognition and characterization of the enzymes involved in
sucrose synthesis and cleavage led to the widely accepted models of how sucrose accumulation occurs in the storage tissue.
New insights were gained into the physiological role of individual enzyme activities in the process of sucrose accumulation
in sugarcane. Studies on cell cultures and on isolated cell fragments initially supported and strengthened these models, but
more recent research has revealed their weaknesses. A dynamic model of rapid cycling of sucrose and turnover of sucrose between
vacuole, metabolic and apoplastic compartments explains much of the data, but the details of how the cycling is regulated
needs to be explored. Genomic research into sucrose metabolism has been based on the premise that cataloging genes expressed
in association with the stalk development would ultimately lead to the identification of genes controlling the accumulation
of sucrose. Considerable progress has been made in understanding and manipulating the sugarcane genome using biotechnological
and cell biology approaches. Thus, the greater understanding of physiology of sucrose accumulation and the sugarcane genome
will play a significant role in the future sugarcane improvement programs and will offer new opportunities to develop it as
a new-generation industrial crop. 相似文献
907.
Yunhao Zhu Pengfei Zhao Xiaolin Wu Wei Wang Monica Scali Mauro Cresti 《Acta Physiologiae Plantarum》2011,33(4):1467-1474
The identification of proteins involved in pollen germination and tube growth is important for fundamental studies of fertility
and reproduction in flowering plants. We used 2-DE and MALDI-TOF-MS to identify differentially expressed proteins in mature
(P0) and 1-h germinated (P1) maize pollen. Among about 470 proteins separated in 2D gels, the abundances of 26 protein spots
changed (up- or down-regulation) between P0 and P1. The 13 up-regulated protein spots were mainly involved in tube wall modification,
actin cytoskeleton organization, energy metabolism, signaling, protein folding and degradation. In particular, pectin methylesterase,
inorganic pyrophosphatase, glucose-1-phosphate uridylyltransferase and rab GDP dissociation inhibitor α are highly up-regulated,
suggesting their potential role in pollen tube growth. The down-regulated 13 protein spots mainly include defense-related
proteins, pollen allergens and some metabolic enzymes. This study would contribute to the understanding of the changes in
protein expression associated with pollen tube development. 相似文献
908.
Giacomucci L Bertoncello R Salvadori O Martini I Favaro M Villa F Sorlini C Cappitelli F 《Microbial ecology》2011,62(2):287-298
The Grande Albergo Ausonia &; Hungaria (Venice Lido, Italy) has an Art Nouveau polychrome ceramic coating on its façade, which was restored in 2007. Soon after the conservation treatment, many tiles of the façade decoration showed coloured alterations putatively attributed to the presence of microbial communities. To confirm the presence of the biological deposit and the stratigraphy of the Hungaria tiles, stereomicroscope, optical and environmental scanning electron microscope observations were made. The characterisation of the microbial community was performed using a PCR–DGGE approach. This study reported the first use of a culture-independent approach to identify the total community present in biodeteriorated artistic tiles. The case study examined here reveals that the coloured alterations on the tiles were mainly due to the presence of cryptoendolithic cyanobacteria. In addition, we proved that the microflora present on the tiles was generally greatly influenced by the environment of the Hungaria hotel. We found several microorganisms related to the alkaline environment, which is in the range of the tile pH, and related to the aquatic environment, the presence of the acrylic resin Paraloid B72® used during the 2007 treatment and the pollutants of the Venice lagoon. 相似文献
909.
910.
Mariagiuseppina Pellegrini Barbara Manconi Alessandra Olianas Maria Teresa Sanna Claudia Meloni Monica Pirastru Paolo Mereu Giovanni Leoni Bruno Masala Laura Manca 《Biochimica et Biophysica Acta (BBA)/General Subjects》2011