全文获取类型
收费全文 | 1945篇 |
免费 | 91篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 21篇 |
综合类 | 3篇 |
化学工业 | 534篇 |
金属工艺 | 66篇 |
机械仪表 | 42篇 |
建筑科学 | 90篇 |
矿业工程 | 12篇 |
能源动力 | 49篇 |
轻工业 | 127篇 |
水利工程 | 9篇 |
石油天然气 | 6篇 |
无线电 | 144篇 |
一般工业技术 | 396篇 |
冶金工业 | 235篇 |
原子能技术 | 10篇 |
自动化技术 | 296篇 |
出版年
2024年 | 6篇 |
2023年 | 22篇 |
2022年 | 88篇 |
2021年 | 83篇 |
2020年 | 46篇 |
2019年 | 49篇 |
2018年 | 47篇 |
2017年 | 63篇 |
2016年 | 72篇 |
2015年 | 51篇 |
2014年 | 75篇 |
2013年 | 122篇 |
2012年 | 113篇 |
2011年 | 110篇 |
2010年 | 109篇 |
2009年 | 81篇 |
2008年 | 100篇 |
2007年 | 91篇 |
2006年 | 66篇 |
2005年 | 61篇 |
2004年 | 46篇 |
2003年 | 37篇 |
2002年 | 42篇 |
2001年 | 27篇 |
2000年 | 37篇 |
1999年 | 15篇 |
1998年 | 54篇 |
1997年 | 26篇 |
1996年 | 35篇 |
1995年 | 26篇 |
1994年 | 19篇 |
1993年 | 18篇 |
1992年 | 10篇 |
1990年 | 9篇 |
1989年 | 11篇 |
1988年 | 9篇 |
1987年 | 10篇 |
1986年 | 11篇 |
1985年 | 10篇 |
1984年 | 12篇 |
1983年 | 12篇 |
1982年 | 7篇 |
1981年 | 11篇 |
1980年 | 15篇 |
1977年 | 9篇 |
1976年 | 8篇 |
1975年 | 7篇 |
1974年 | 9篇 |
1973年 | 6篇 |
1971年 | 6篇 |
排序方式: 共有2040条查询结果,搜索用时 15 毫秒
61.
Ekaterina M. Dvorianinova Nadezhda L. Bolsheva Elena N. Pushkova Tatiana A. Rozhmina Alexander A. Zhuchenko Roman O. Novakovskiy Liubov V. Povkhova Elizaveta A. Sigova Daiana A. Zhernova Elena V. Borkhert Dmitry N. Kaluzhny Nataliya V. Melnikova Alexey A. Dmitriev 《International journal of molecular sciences》2022,23(21)
High-quality genome sequences help to elucidate the genetic basis of numerous biological processes and track species evolution. For flax (Linum usitatissimum L.)—a multifunctional crop, high-quality assemblies from Oxford Nanopore Technologies (ONT) data were unavailable, largely due to the difficulty of isolating pure high-molecular-weight DNA. This article proposes a scheme for gaining a contiguous L. usitatissimum assembly using Nanopore data. We developed a protocol for flax nuclei isolation with subsequent DNA extraction, which allows obtaining about 5 μg of pure high-molecular-weight DNA from 0.5 g of leaves. Such an amount of material can be collected even from a single plant and yields more than 30 Gb of ONT data in two MinION runs. We performed a comparative analysis of different genome assemblers and polishers on the gained data and obtained the final 447.1-Mb assembly of L. usitatissimum line 3896 genome using the Canu—Racon (two iterations)—Medaka combination. The genome comprised 1695 contigs and had an N50 of 6.2 Mb and a completeness of 93.8% of BUSCOs from eudicots_odb10. Our study highlights the impact of the chosen genome construction strategy on the resulting assembly parameters and its eligibility for future genomic studies. 相似文献
62.
Tomas Selicky Matus Jurcik Barbora Mikolaskova Alexandra Pitelova Nina Mayerova Miroslava Kretova Michaela Osadska Jan Jurcik Roman Holic Lenka Kohutova Jana Bellova Zsigmond Benko Juraj Gregan Silvia Bagelova Polakova Peter Barath Lubos Cipak Ingrid Cipakova 《International journal of molecular sciences》2022,23(21)
63.
Jan Louzil Jana Stikarova Dana Provaznikova Ingrid Hrachovinova Tereza Fenclova Jan Musil Martin Radek Jirina Kaufmanova Vera Geierova Eliska Ceznerova Peter Salaj Roman Kotlin 《International journal of molecular sciences》2022,23(22)
A single-center study was conducted on 120 patients with inherited disorders of primary hemostasis followed at our hematological center. These patients presented a variety of bleeding symptoms; however, they had no definitive diagnosis. Establishing a diagnosis has consequences for the investigation of probands in families and for treatment management; therefore, we aimed to improve the diagnosis rate in these patients by implementing advanced diagnostic methods. According to the accepted international guidelines at the time of study, we investigated platelet morphology, platelet function assay, light-transmission aggregometry, and flow cytometry. Using only these methods, we were unable to make a definitive diagnosis for most of our patients. However, next-generation sequencing (NGS), which was applied in 31 patients, allowed us to establish definitive diagnoses in six cases (variants in ANKRD26, ITGA2B, and F8) and helped us to identify suspected variants (NBEAL2, F2, BLOC1S6, AP3D1, GP1BB, ANO6, CD36, and ITGB3) and new suspected variants (GFI1B, FGA, GP1BA, and ITGA2B) in 11 patients. The role of NGS in patients with suspicious bleeding symptoms is growing and it changes the diagnostic algorithm. The greatest disadvantage of NGS, aside from the cost, is the occurrence of gene variants of uncertain significance. 相似文献
64.
Evgeny Grigoriev Anastasia V. Ponasenko Anna V. Sinitskaya Artem A. Ivkin Roman A. Kornelyuk 《International journal of molecular sciences》2022,23(23)
Assess the level of mitochondrial DNA depending on the presence of multiple organ failure in patients after heart surgery. The study included 60 patients who underwent surgical treatment of valvular heart disease using cardiopulmonary bypass. Uncomplicated patients were included in the 1st group (n = 30), patients with complications and multiple organ failure (MOF) were included in the 2nd group (n = 30). Serum mtDNA levels were determined by quantitative real-time polymerase chain reaction with fluorescent dyes. Mitochondrial DNA gene expression did not differ between group before surgery. Immediately after the intervention, cytochrome B gene expression was higher in the group with MOF, and it remained high during entire follow-up period. A similar trend was observed in cytochrome oxidase gene expression. Increased NADH levels of gene expressions during the first postoperative day were noted in both groups, the expression showed tendency to increase on the third postoperative day. mtDNA gene expression in the “MOF present” group remained at a higher level compared with the group without complications. A positive correlation was reveled between the severity of MOF according to SOFA score and the level of mtDNA (r = 0.45; p = 0.028) for the end-point “First day”. The ROC analysis showed that mtDNA circulating in plasma (AUC = 0.605) can be a predictor of MOF development. The level of mtDNA significantly increases in case of MOF, irrespective of its cause. (2) The expression of mtDNA genes correlates with the level of MOF severity on the SOFA score. 相似文献
65.
Oana Baldasici Loredana Balacescu Daniel Cruceriu Andrei Roman Carmen Lisencu Bogdan Fetica Simona Visan Andrei Cismaru Ancuta Jurj Lucian Barbu-Tudoran Valentina Pileczki Laurian Vlase Oana Tudoran Ovidiu Balacescu 《International journal of molecular sciences》2022,23(20)
Neo-adjuvant therapy (NAT) is increasingly used in the clinic for the treatment of breast cancer (BC). Pathological response to NAT has been associated with improved patients’ survival; however, the current techniques employed for assessing the tumor response have significant limitations. Small EVs (sEVs)-encapsulated miRNAs have emerged as promising new biomarkers for diagnosis and prediction. Therefore, our study aims to explore the predictive value of these miRNAs for the pathological response to NAT in BC. By employing bioinformatic tools, we selected a set of miRNAs and evaluated their expression in plasma sEVs and BC biopsies. Twelve miRNAs were identified in sEVs, of which, miR-21-5p, 221-3p, 146a-5p and 26a-5p were significantly associated with the Miller–Payne (MP) pathological response to NAT. Moreover, miR-21-5p, 146a-5p, 26a-5p and miR-24-3p were independent as predictors of MP response to NAT. However, the expression of these miRNAs showed no correlation between sEVs and tissue samples, indicating that the mechanisms of miRNA sorting into sEVs still needs to be elucidated. Functional analysis of miRNA target genes and drug interactions revealed that candidate miRNAs and their targets, can be regulated by different NAT regimens. This evidence supports their role in governing the patients’ therapy response and highlights their potential use as prediction biomarkers. 相似文献
66.
Panagiota Kakni Roman Truckenmüller Pamela Habibovi Martijn van Griensven Stefan Giselbrecht 《International journal of molecular sciences》2022,23(23)
The mammalian intestinal epithelium contains more immune cells than any other tissue, and this is largely because of its constant exposure to pathogens. Macrophages are crucial for maintaining intestinal homeostasis, but they also play a central role in chronic pathologies of the digestive system. We developed a versatile microwell-based intestinal organoid-macrophage co-culture system that enables us to recapitulate features of intestinal inflammation. This microwell-based platform facilitates the controlled positioning of cells in different configurations, continuous in situ monitoring of cell interactions, and high-throughput downstream applications. Using this novel system, we compared the inflammatory response when intestinal organoids were co-cultured with macrophages versus when intestinal organoids were treated with the pro-inflammatory cytokine TNF-α. Furthermore, we demonstrated that the tissue-specific response differs according to the physical distance between the organoids and the macrophages and that the intestinal organoids show an immunomodulatory competence. Our novel microwell-based intestinal organoid model incorporating acellular and cellular components of the immune system can pave the way to unravel unknown mechanisms related to intestinal homeostasis and disorders. 相似文献
67.
68.
Klaudia Kwieciska Anna Stachowicz-Kunierz Beata Korchowiec Maciej Roman Wojciech M. Kwiatek Anna Jagusiak Irena Roterman Jacek Korchowiec 《International journal of molecular sciences》2022,23(16)
The uptake and distribution of doxorubicin in the MCF7 line of breast-cancer cells were monitored by Raman measurements. It was demonstrated that bioavailability of doxorubicin can be significantly enhanced by applying Congo red. To understand the mechanism of doxorubicin delivery by Congo red supramolecular carriers, additional monolayer measurements and molecular dynamics simulations on model membranes were undertaken. Acting as molecular scissors, Congo red particles cut doxorubicin aggregates and incorporated them into small-sized Congo red clusters. The mixed doxorubicin/Congo red clusters were adsorbed to the hydrophilic part of the model membrane. Such behavior promoted transfer through the membrane. 相似文献
69.
B. Douillard N. Nourani-Vatani M. Johnson-Roberson O. Pizarro S. Williams C. Roman I. Vaughn 《Autonomous Robots》2013,35(4):255-269
A method for segmenting three-dimensional data of underwater unstructured terrains is presented. The three-dimensional point clouds are converted to two-dimensional elevation maps and analyzed for segmentation in the frequency domain. The lower frequency components represent the slower varying undulations of the underlying ground. The cut-off frequency, below which the frequency components form the ground surface, is determined automatically using peak detection. The user can also specify a maximum admissible size of objects to drive the automatic detection of the cut-off frequency. The points above the estimated ground surface are clustered via standard proximity clustering to form object segments. The precision of the segmentation is compared against ground truth hand labelled data acquired by a stereo camera pair and a structured light sensor. It is also evaluated for registration error when the extracted segments are used for sub-map alignment. The proposed approach is compared to three point cloud based and two image based segmentation algorithms. The results show that the approach is applicable to a range of different terrains and is able to generate features useful for navigation. 相似文献
70.
Campylobacter represents one of the leading causes of foodborne enteritis. Poultry and its products frequently transmit the pathogen. The objective of the present study was to model predictively the short-term inactivation of Campylobacter in a ready-to-eat poultry product to develop an economic high-pressure treatment. We inactivated baroresistant strains of Campylobacter jejuni and Campylobacter coli, grown to stationary phase on nutrient agar and inoculated in poultry meat slurry, by heat and high hydrostatic pressure. Incubation at ambient pressure at 70 degrees C for 1 min and at 450 MPa at 15 degrees C for 30 s inactivated more than 6 log CFU of this foodborne pathogen per ml of poultry meat slurry. Thermal and pressure inactivation kinetics of C. coli and C. jejuni in poultry meat slurry were accurately described by a first-order kinetic model. A mathematical model was developed from 10 to 65 degrees C and from ambient to 500 MPa that predicts the reduction in numbers of Campylobacter in response to the combination of temperature, pressure, and treatment time. We suggest the high-pressure treatment of foods to avoid health risks caused by Campylobacter. The nonthermal short-term treatment of the examined food model system represents a successful step to an economic high-pressure procedure. 相似文献