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41.
Kashinskaya E. N. Simonov E. P. Izvekova G. I. Baturina O. A. Solovyev M. M. 《Journal of Ichthyology》2021,61(6):955-971
Journal of Ichthyology - The composition of the microbiota of the digestive tract of two fish species differing in feeding habits—perch Perca fluviatilis and Prussian carp Carassius gibelio... 相似文献
42.
Izvekova GI 《Parazitologiia》2003,37(6):496-502
Characteristics of final stages of carbohydrate metabolism in a cestode Eubothrium rugosum from the burbot intestine have been studied. It is found out that in the course of in vitro incubation the worms produce lactic acid to the environment with a concomitant acidification of the medium. The rate of pH changes and lactate production eventually fell during the incubation. The medium pH being the result of helminth's metabolism varies within the normal physiological limits of the host intestine pH and pH optima for its basic digestive enzymes. 相似文献
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Using Atlantic salmon (Salmo salar) as a model system, we investigated whether 18 microsatellites tightly linked to immune‐relevant genes have experienced different selection pressures than 76 loci with no obvious association with immune function. Immune‐relevant loci were identified as outliers by two outlier tests significantly more often than nonimmune linked loci (22% vs. 1.6%). In addition, the allele frequencies of immune relevant markers were more often correlated with latitude and temperature. Combined, these results support the hypothesis that immune‐relevant loci more frequently exhibit footprints of selection than other loci. They also indicate that the correlation between immune‐relevant loci and latitude may be due to temperature‐induced differences in pathogen‐driven selection or some other environmental factor correlated with latitude. 相似文献
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46.
An Atlantic salmon (Salmo salar L.) expressed sequence tag (EST) database consisting of 58 146 ESTs was screened for microsatellite sequences. Subsequent development of 75 polymorphic EST‐associated microsatellite markers in this species is described together with cross‐species amplification results of 133 gene‐associated tandem repeat markers in five salmonid species (Salmo trutta, Oncorhynchus mykiss, Salvelinus aplinus, Thymallus thymallus, Coregonus lavaretus). The number of alleles among EST‐linked microsatellites in Atlantic salmon ranged from two to 41 with an average of 12 alleles per locus. Cross‐species amplification resulted in detection of a total of 111 polymorphic locus‐species combinations (12–32 loci per species). 相似文献
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48.
Chironomus piger larvae are widespread in small rivers and canals strongly polluted with domestic sewage. Despite this, almost nothing is known concerning the biology of the species under natural conditions and its role in the process of river self-purification. For two years, benthic samples were collected in the Sestra River at a site about 250 m downstream of the effluent discharge drains of a sewage treatment installation where the greatest concentrations of the larvae occurred. The number and biomass ofC. piger larvae were subject to marked fluctuations,viz. 96,000–348,000 ind m–2 and 420–1,800 g m–2. 460 degreedays (on average) was required for development of one generation.C. piger has 5 or 6 generations per year depending on the hydrometeorological conditions during the growing season.C. piger larvae play an important role in self-purification of the river. They utilize precipitating seston for food and for building their dwelling tubes. According to our calculations the amount of organic matter assimilated in the area of maximum larval concentration ranged 80–177 g wet weight m–2 day–1, and 32–71 g wet weight m–2day–1 was mineralized. 相似文献
49.
GI Malinin 《Biotechnic & histochemistry》2013,88(2):65-69
It has been reported that the use of dimethylsulfoxide (DMSO) as a solvent for fixatives enhances preservation of cellular ultrastructure. By contrast, we have shown that DMSO alters the ultrastructural integrity of glutaraldehyde fixed cells. The cell membrane, nuclear envelope, endoplasmic reticulum, ribosomes, microtubules and intracytoplasmic organelles are most susceptible to the action of DMSO. We hypothesize that DMSO exerts intracellular alterations via its interaction with remnant interfacial water in fixed cells. DMSO-induced alterations of these and related cellular components may result in the formation of artefactual structures and networks. Thus, it appears that DMSO containing glutaraldehyde neither accelerates fixation nor enhances stabilization of cellular ultrastructure. For these reasons, addition of DMSO to fixatives is not recommended. 相似文献
50.
G. I. Izvekova 《Journal of Evolutionary Biochemistry and Physiology》2005,41(2):185-193
It is established that specific groups of bacteria releasing amylolytic and proteolytic enzymes into environment are associated with various degree of firmness with digestive-transport surfaces of pike intestine and of T. nodulosus parasitizing in it. The revealed bacteria can under different conditions act either as competitors for the host and the parasite for available nutritive substrates or as suppliers of the hydrolytic enzymes used by both of them in the processes of digestion, which reduces the energy expenditures of microorganisms for hydrolysis of highly-molecular substrates. The greatest contribution to these processes both in the host and in the parasite seems to be made by the microorganisms that are more firmly bound to their digestive-transport surfaces and removed with a greater difficultly from intestine during peristalsis.__________Translated from Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, Vol. 41, No. 2, 2005, pp. 146-153.Original Russian Text Copyright © 2005 by Izvekova. 相似文献