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101.
Biocontrol and PGPR Features in Native Strains Isolated from Saline Soils of Argentina 总被引:2,自引:0,他引:2
Príncipe A Alvarez F Castro MG Zachi L Fischer SE Mori GB Jofré E 《Current microbiology》2007,55(4):314-322
A bacterial collection of approximately one thousand native strains, isolated from saline soils of Cordoba province (Argentina),
was established. From this collection, a screening to identify those strains showing plant growth promotion and biocontrol
activities, as well as salt tolerance, was performed. Eight native strains tolerant to 1 M NaCl and displaying plant growth promotion and/or biocontrol features were selected for further characterization. Strains
MEP2 18, MRP2 26, MEP2 11a, MEP3 1, and MEP3 3b significantly increased the growth of maize seedlings under normal and saline conditions, whereas isolates ARP2 3, AEP1 5, and ARP2 6 were able to increase the root dry weight of agropyre under saline conditions. On the other hand, strains MEP2 18 and ARP2 3 showed antagonistic activity against phytopathogenic fungi belonging to Sclerotinia and Fusarium genus. Antifungal activity was found in cell-free supernatants, and it was heat and protease resistant. Strains MEP218 and ARP23 were identified as Bacillus sp. and strains MEP211a and MEP33b as Ochrobactrum sp. according to the sequence analysis of 16S rRNA gene. 相似文献
102.
Analía I Sannazzaro Mariela Echeverría Edgardo O Albertó Oscar A Ruiz Ana B Menéndez 《Plant Physiology and Biochemistry》2007,45(1):39-46
In this work we investigated the involvement of Glomus intraradices in the regulation of plant growth, polyamines and proline levels of two Lotus glaber genotypes differing in salt tolerance, after longterm exposure to saline stress. The experiment consisted of a randomized block design with three factors: (1) mycorrhizal treatments (with or without AM fungus); (2) two salinity levels of 0 and 200mM NaCl; and (3) L. glaber genotype. Experiments were performed using stem cuttings derived from L. glaber individuals representing a natural population from saline lowlands. One of the most relevant results was the higher content of total free polyamines in mycorrhized plants compared to non-AM ones. Since polyamines have been proposed as candidates for the regulation of root development under saline situations, it is possible that AM plants (which contained higher polyamine levels and showed improved root growth) were better shaped to cope with salt stress. Colonization by G. intraradices also increased (Spd+Spm)/Put ratio in L. glaber roots. Interestingly, such increment in salt stressed AM plants of the sensitive genotype, was even higher than that produced by salinization or AM symbiosis separately. On the other hand, salinity but not mycorrhizal colonization influenced proline levels in both L. glaber genotypes since high proline accumulation was observed in both genotypes under salt stress conditions. Our results suggest that modulation of polyamine pools can be one of the mechanisms used by AM fungi to improve L. glaber adaptation to saline soils. Proline accumulation in response to salt stress is a good indicator of stress perception and our results suggest that it could be used as such among L. glaber genotypes differing in salt stress tolerance. 相似文献
103.
Antonio S. Rosa Jimena P. Cejas Edgardo A. Disalvo María A. Frías 《生物化学与生物物理学报:生物膜》2019,1861(6):1197-1203
This paper demonstrates by means of FTIR/ATR analysis that water molecules intercalate at different extents in the acyl chain region of lipid membranes in correlation with the hydration of the phosphate groups.This correlation is sensible to the chain length, the presence of double bonds and the phase state of the lipid membrane.The presence of carbonyl groups CO modifies the profile of hydration of the two regions as observed from the comparison of DMPC and 14:0 Diether PC.The different water populations in lipid interphases would give arrangements with different free energy states that could drive the interaction of biological effectors with membranes. 相似文献
104.
105.
106.
Anna Martirosyan Camino Pérez-Gutierrez Romain Banchereau Hélène Dutartre Patrick Lecine Melissa Dullaers Marielle Mello Suzana Pinto Salcedo Alexandre Muller Lee Leserman Yves Levy Gerard Zurawski Sandy Zurawski Edgardo Moreno Ignacio Moriyón Eynav Klechevsky Jacques Banchereau SangKon Oh Jean-Pierre Gorvel 《PLoS pathogens》2012,8(11)
Bacterial cyclic glucans are glucose polymers that concentrate within the periplasm of alpha-proteobacteria. These molecules are necessary to maintain the homeostasis of the cell envelope by contributing to the osmolarity of Gram negative bacteria. Here, we demonstrate that Brucella β 1,2 cyclic glucans are potent activators of human and mouse dendritic cells. Dendritic cells activation by Brucella β 1,2 cyclic glucans requires TLR4, MyD88 and TRIF, but not CD14. The Brucella cyclic glucans showed neither toxicity nor immunogenicity compared to LPS and triggered antigen-specific CD8+ T cell responses in vivo. These cyclic glucans also enhanced antigen-specific CD4+ and CD8+ T cell responses including cross-presentation by different human DC subsets. Brucella β 1,2 cyclic glucans increased the memory CD4+ T cell responses of blood mononuclear cells exposed to recombinant fusion proteins composed of anti-CD40 antibody and antigens from both hepatitis C virus and Mycobacterium tuberculosis. Thus cyclic glucans represent a new class of adjuvants, which might contribute to the development of effective antimicrobial therapies. 相似文献
107.
Chiaiese P Palomba F Galante C Esposito S De Biasi MG Filippone E 《International journal of phytoremediation》2012,14(9):835-844
A biotechnological approach was applied to reduce phenol content in olive mill wastewaters by transgenic tobacco plants. The cDNA laccase of poxC gene from Pleurotus ostreatus, carrying its own signal peptide for extracellular secretion, was transferred into the Nicotiana tabacum genome. Transgenic tobacco plants were obtained and the recombinant enzyme was secreted into the rhizosphere by the plant root apparatus, confirming the ability of the plant machinery to recognize the fungal POXC peptide signal leader appropriately as secretory tag. Total laccase activity assayed by ABTS in transgenic lines increased sharply compared to control plants. Moreover, plants cultivated in a hydroponic solution with the addition of olive mill wastewaters were able to reduce the total phenol content up to 70%. 相似文献
108.
The federally endangered Alabama lampmussel (Lampsilis virescens) has been presumed extirpated in the Emory river, TN for almost four decades. In the fall of 2011, three specimens that were
morphologically identified as L. virescens (based on external shell morphology) were collected from the Emory river. The significance of such a find led biologists
to take a noninvasive tissue sample from each individual for genetic confirmation. Approximately 400 nucleotides of the mtDNA
COI gene were sequenced for each individual along with two samples of L. virescens from the Paint Rock river. DNA sequence data was also obtained from Genbank for other Lampsilis sp. Maximum parsimony and Bayesian phylogenetic methods revealed strong support for a clade consisting of putative Emory
river L. virescens and known L. virescens (Paint Rock river origin) that was sister to all other taxa. These results indicated that the individuals collected from
the Emory river were indeed L. virescens. 相似文献
109.
C Meyniel T Spelman VG Jokubaitis M Trojano G Izquierdo F Grand'Maison C Oreja-Guevara C Boz A Lugaresi M Girard P Grammond G Iuliano M Fiol JA Cabrera-Gomez R Fernandez-Bolanos G Giuliani J Lechner-Scott E Cristiano J Herbert T Petkovska-Boskova R Bergamaschi V van Pesch F Moore N Vella M Slee V Santiago M Barnett E Havrdova C Young CA Sirbu M Tanner M Rutherford H Butzkueven;MSBasis Study Group 《PloS one》2012,7(6):e38661
110.
Buggio L Vercellini P Somigliana E Viganò P Frattaruolo MP Fedele L 《Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology》2012,28(10):753-757
Female beauty has always attracted human beings. In particular, beauty has been interpreted in terms of reproductive potential and advantage in selection of mates. We have reviewed the recent literature on female facial and physical beauty with the objective of defining which parameters could influence female attractiveness. Symmetry, averageness, and sexual dimorphism with regards to facial beauty, as well as waist-to-hip ratio (WHR), breast size, and body mass index (BMI) for physical beauty, have been assessed. In current societies, it appears that facial attractiveness results from a mixture of symmetry and averageness of traits, high forehead and cheekbones, small nose and chin, full lips, thin eyebrows, and thick hair. A low WHR reliably characterized physical attractiveness, whereas inconsistencies have been observed in the evaluation of breast size and BMI. The importance of breast size appears to vary with time and sex of evaluators, whereas the impact of BMI is related to socio-economic conditions. The various hypotheses behind beauty and the role of attractiveness in mate choice and sexual selection are here described in terms of continuation of human species. Intriguing associations are emerging between features of attractiveness and some reproductive disorders, as both are substantially influenced by sex steroid hormones. 相似文献