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111.
112.
C L Eriksson de Rezende E T Mallinson A Gupte S W Joseph 《Journal of industrial microbiology & biotechnology》2001,26(4):222-225
Controlling water activity (a
w) can significantly impact the growth of Salmonella in poultry litter and manure — a phenomenon that was studied quantitatively using two common serotypes of Salmonella. The quantitative effect of changes in levels of a
w on Salmonella populations was determined using inoculated, frosted glass rectangles placed in closed chambers (microcosms). Glass rectangles
with known concentrations of Salmonella enteritidis and S. brandenburg were placed in microcosms maintained at an a
w level of 0.893 for 24 h at room temperature (RT) and then transferred to other microcosms maintained at the same temperature
but with higher a
w levels (0.932 and 0.987). Salmonella populations on the slides were quantified at 4, 18, 24, and 48 h. Slightly elevated levels of a
w (<0.1, i.e., 10% equilibrium relative humidity) for 24 h resulted in a 100-fold increase in counts of Salmonella. The data also suggested that in vitro adaptation to dry environments may occur when the organisms are exposed to alternating levels of relatively high and low
(0.987 and 0.893) levels of a
w. Any increased tolerance of Salmonella to reduced levels of a
w could be the result of physico-chemical changes in the organism due to selective environmental pressure, formation of a protective
biofilm, and/or entry into a dormant state. Results from this study are compatible with those from previously reported on-farm
surveys, reinforcing the contention that maintaining a
w below 0.85 in and around litter/manure surfaces in poultry or livestock bedding areas may be a critical factor in safe production
of food. Journal of Industrial Microbiology & Biotechnology (2001) 26, 222–225.
Received 18 May 2000/ Accepted in revised form 24 January 2001 相似文献
113.
《Molecular & cellular proteomics : MCP》2022,21(12):100441
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114.
《Molecular & cellular proteomics : MCP》2022,21(10):100281
Spermatozoa are central to fertilization and the evolutionary fitness of sexually reproducing organisms. As such, a deeper understanding of sperm proteomes (and associated reproductive tissues) has proven critical to the advancement of the fields of sexual selection and reproductive biology. Due to their extraordinary complexity, proteome depth-of-coverage is dependent on advancements in technology and related bioinformatics, both of which have made significant advancements in the decade since the last Drosophila sperm proteome was published. Here, we provide an updated version of the Drosophila melanogaster sperm proteome (DmSP3) using improved separation and detection methods and an updated genome annotation. Combined with previous versions of the sperm proteome, the DmSP3 contains a total of 3176 proteins, and we provide the first label-free quantitation of the sperm proteome for 2125 proteins. The top 20 most abundant proteins included the structural elements α- and β-tubulins and sperm leucyl-aminopeptidases. Both gene content and protein abundance were significantly reduced on the X chromosome, consistent with prior genomic studies of X chromosome evolution. We identified 9 of the 16 Y-linked proteins, including known testis-specific male fertility factors. We also identified almost one-half of known Drosophila ribosomal proteins in the DmSP3. The role of this subset of ribosomal proteins in sperm is unknown. Surprisingly, our expanded sperm proteome also identified 122 seminal fluid proteins (Sfps), proteins originally identified in the accessory glands. We show that a significant fraction of ‘sperm-associated Sfps’ are recalcitrant to concentrated salt and detergent treatments, suggesting this subclass of Sfps are expressed in testes and may have additional functions in sperm, per se. Overall, our results add to a growing landscape of both sperm and seminal fluid protein biology and in particular provides quantitative evidence at the protein level for prior findings supporting the meiotic sex-chromosome inactivation model for male-specific gene and X chromosome evolution. 相似文献
115.
116.
建立一种靶点蛋白质快速定量检测方法。在原有侧向流动免疫层析技术的基础上,通过优化层析材料和纳米微球的均一性、改进检测区的检测方法,经逐点扫描技术,建立标准浓度曲线,以达到对临床靶点蛋白质的定量检测。以乳腺癌组织中的Her2表达为例,通过对已知浓度样品的检测,验证本技术方法的准确度大于96%。另外,以蛋白质免疫印迹作为组织中特定蛋白质检测金标准,分析临床肿瘤组织中Her2蛋白的含量,其准确率也达到95.5%,而免疫组织化学方法检测准确率仅为69.58%。新型免疫层析法检测结果与靶向治疗患者的愈后密切相关(P<0.01)。改进后的新型免疫层析方法能够准确地对临床靶点蛋白质进行定量检测,而且结合侧向流动技术的简单、快速和易用性,这种新型检测方法可以广泛应用于临床组织标本、血液标本和体液标本中靶点蛋白质的临场定量检测,在一定程度上可以替代免疫组化技术。 相似文献
117.
《Molecular & cellular proteomics : MCP》2023,22(1):100476
Cancer-derived extracellular vesicles (EVs) promote tumorigenesis, premetastatic niche formation, and metastasis via their protein cargo. However, the proteins packaged by patient tumors into EVs cannot be determined in vivo because of the presence of EVs derived from other tissues. We therefore developed a cross-species proteomic method to quantify the human tumor-derived proteome of plasma EVs produced by patient-derived xenografts of four cancer types. Proteomic profiling revealed individualized packaging of novel protein cargo, and machine learning accurately classified the type of the underlying tumor. 相似文献
118.
《Molecular & cellular proteomics : MCP》2020,19(5):828-838
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- •Higher AGC significantly improves quantitation quality in single-cell analysis.
- •The boosting-to-sample ratio should be carefully evaluated and optimized.
- •iBASIL allows for precise quantitation of 1,500 proteins from 104 AML single cells.
- •iBASIL recapitulates major biological differences in different AML single cells.
119.
A method of quantifying bands on polyacrylamide gels based on image processing of digitized photographic negatives is presented. 相似文献
120.
Jana Zecha Chien-Yun Lee Florian P. Bayer Chen Meng Vincent Grass Johannes Zerweck Karsten Schnatbaum Thomas Michler Andreas Pichlmair Christina Ludwig Bernhard Kuster 《Molecular & cellular proteomics : MCP》2020,19(9):1503-1522
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- •In-depth proteomes of 4 SARS-CoV-2 cell line models (Vero E6, Calu-3, Caco-2, A549).
- •Proteomic evidence for thousands of Chlorocebus sabaeus proteins.
- •Proteomic response of Vero E6 cells to SARS-CoV-2 infection.
- •Synthetic peptides, spectral libraries, and targeted assays for SARS-CoV-2 proteins.