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排序方式: 共有271条查询结果,搜索用时 15 毫秒
261.
Mohamed N. Amin Mohammed El-Mowafy Ali Mobark Naglaa Abass Abdelaziz Elgaml 《Saudi Journal of Biological Sciences》2021,28(1):724-730
Muscles of candidates work at various grades of intensity during handball exercises according to the pace of exercise. The movement pattern involves large number of contractions, feints, dodges and numerous changes in movements, all of which are highly responsible for changes in trainer's organs, including the immune system. In this study, inflammatory mediators involving interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-α) in serum of 18 Egyptian male handball players, selected from Tanta club handball under 21 year’s old team, were analyzed. The analysis was established on samples collected just before and immediately after intermediate reasonable exercise via enzyme linked immunosorbent assay (ELISA). Moreover, white blood cells (WBCs) count and other hematological markers including hemoglobin %, hematocrit value, and platelet count were assessed. Our results demonstrated a significant decrease in the levels of IL-6 and TNF-α after exercise compared to those before exercise. This was coupled with an increase in WBCs and platelets count. It is also noteworthy that there was a significant positive correlation between serum levels of IL-6 and TNF-α in the study subjects coupled with a significant negative correlation between IL-6 and WBCs after the exercise. Therefore, it is concluded that intermediate reasonable exercises result in decreased levels of IL-6 and TNF-α, which result in decreasing of the inflammation and help in healing and rapid recovery of muscles of the candidates. 相似文献
262.
Georges Massiot Anne-Marie Morfaux Louisette Le Men-Olivier James Bouquant Abdelaziz Madaci Abdallah Mahamoud Mariette Chopova Paul Aclinou 《Phytochemistry》1985,25(1):258-261
Six guaianolides have been isolated from the aerial parts of Centaurea incana from Algeria. They were identified as desoxyrepin, repin or subluteolide, repin monochlorhydrin, acroptilin, janerin and repdiolide triol. 相似文献
263.
Alyaa Elsaid Abdelaziz Fadl Magdy Elsayed Mahfouz Mona Mabrouk Taha El-Gamal 《Invertebrate reproduction & development.》2019,63(1):11-22
The purple sea urchin, Strongylocentrotus purpuratus, has been the focus of extensive ecological and developmental research over the years. Strongylocentrotus purpuratus larvae transition into the juvenile stage after an extensive planktonic period. The metamorphic transition is characterized by dramatic changes in morphology and physiology of the juvenile compared to the larval form and mechanisms underlying this process, especially the early days post-settlement, remain poorly understood. We used SEM and phalloidin stain analysis as well as whole mount in situ hybridization to gain a detailed understanding of juvenile development in relation to nutrient signalling [insulin-like growth factor (IIS), FoxO (forkhead box, sub-group ‘O’) and TOR (target of rampamycin), also known as IIS/TOR/FoxO signalling]. Our results show that the majority of juvenile feeding features are fully developed only after 8-days of juvenile development, leaving an extensive period of nutritional stress. We found that FoxO gene expression increases during that time period and is localized in juvenile tube feet, potentially associated with sensory structures involved in nutrient signalling. Our data complement existing work on sea urchin juvenile development and shed new light on the perimetamorphic period of Strongylocentrotus purpuratus, with respect to nutrient signalling and the potential stressful pre-feeding period of juvenile sea urchins. 相似文献
264.
Mouna Sahnoun Belgacem Naili Fatma Elgharbi Radhouane Kammoun Karima Gabsi Samir Bejar 《Biologia》2013,68(5):808-815
An optimum Aspergillus oryzae CBS 819.72 α-amylase production in a laboratory-scale fermentor using a wheat grinding by-product as a sole carbon source (340 U/mL) was obtained after 48 h of batch fermentation under an agitation rate of 900 rpm and a pH maintained constant for 24 h. The application of this α-amylase preparation at an adequate concentration showed positive effects on dough properties and bread quality. Extensographic analysis revealed that while this addition induced a significant increase in maximal dough resistance to extension and area below the curve (energy), it brought a substantial decrease in extensibility. Farinographic results revealed small decreases in terms of time development, water absorption, and dough stability. Bread volume was also observed to undergo a significant increase. 相似文献
265.
Abdelaziz Amer M. Salem Salem S. Khalil Ahmed M. A. El-Wakil Deiaa A. Fouda Hossam M. Hashem Amr H. 《Biometals》2022,35(3):601-616
BioMetals - In this study, a novel, non-toxic, eco-friendly zinc oxide nanoparticles (ZnO-NPs) was used instead of the synthetic fungicides widely used to control the destructive phytopathogenic... 相似文献
266.
S. Kammoun G. Parseihian O. Gutierrez A. Brilhault A. Serpa M. Raynal B. Oriola M.J.-M. Macé M. Auvray M. Denis S.J. Thorpe P. Truillet B.F.G. Katz C. Jouffrais 《IRBM》2012,33(2):182-189
Navigation, especially in unknown areas, remains a major problem for the visually impaired (VI). Over the past 50 years, a number of electronic travel aids (ETAs) have been developed with the aim of improving the mobility of the VI. Despite the efforts, these systems are rarely used. Although the explanation is likely to be incomplete, it is possible to identify three important factors: (1) positioning accuracy provided by these devices is not sufficient to guide a VI pedestrian, (2) these systems are based on Geographical Information Systems not adapted to pedestrian mobility, and (3) the guidance methods should be adapted to the task of pedestrian navigation. The NAVIG project aims to answer all these limitations through a participatory design framework with the VI and orientation and mobility instructors. The NAVIG device aims to complement conventional mobility aids (i.e. white cane and guide dog), while also adding unique features to localize specific objects in the environment, restore some visuomotor abilities, and assist navigation. 相似文献
267.
James A. West Abdelaziz Beqqali Zsuzsanna Ament Perry Elliott Yigal M. Pinto Eloisa Arbustini Julian L. Griffin 《Metabolomics : Official journal of the Metabolomic Society》2016,12(3):59
Metabolomics can be performed either as an ‘open profiling’ tool where the aim is to measure, usually in a semi-quantitative manner, as many metabolites as possible or perform ‘closed’ or ‘targeted’ analyses where instead a pre-defined set of metabolites are measured. Targeted methods can be designed to be more sensitive and quantitative and so are particularly appropriate to systems biology for quantitative models of systems or when metabolomics is performed in a hypothesis driven manner to test whether a particular pathway is perturbed. We describe a targeted metabolomics assay that quantifies a broad range of over 130 metabolites relevant to cardiac metabolism including the pathways of the citric acid cycle, fatty acid oxidation, glycolysis, the pentose phosphate pathway, amino acid metabolism, the urea cycle, nucleotides and reactive oxygen species using tandem mass spectrometry to produce quantitative, sensitive and robust data. This assay is illustrated by profiling cardiac metabolism in a lamin A/C (Lmna) mouse model of dilated cardiomyopathy (DCM). The model of DCM was characterised by increases in concentrations of proline and methyl-histidine suggestive of increased myofibrillar and collagen degradation, as well as decreases in a number of citric acid cycle intermediates and carnitine derivatives indicating reduced energy metabolism in the dilated heart. These assays could be used for any other cardiac or cardiovascular disease in that they cover central core metabolism and key pathways involved in cardiac metabolism, and may provide a general start for many mammalian systems. 相似文献
268.
Khalid M. Badr El-Din Hesham Salem Sayed Derayea Amany Abdelaziz Dalia M. Nagy 《Luminescence》2023,38(9):1583-1590
A spectrofluorimetric approach that is sensitive, simple, validated, and cost-effective has been proposed for the estimation of amlodipine (AML) and perindopril (PER) in their bulk powders, pharmaceutical formulations, and spiked human plasma. The recommended approach utilized the quantitative quenching effect of the two cited drugs on the fluorescence intensity of erythrosine B, as a result of complex binary reactions among each drug with erythrosine B at pH 3.5 (Teorell and Stenhagen buffer). The quenching of erythrosine B fluorescence was recorded at 554 nm after excitation at 527 nm. The calibration curve was detected in the range 0.25–3.0 μg ml−1, with a correlation coefficient of 0.9996 for AML, and 0.1–1.5 μg ml−1, with a correlation coefficient of 0.9996 for PER. The established spectrofluorimetric approach was validated for the estimation of the cited drugs with high sensitivity regarding International Council on Harmonization guidelines. Therefore, the established approach could be utilized for quality control of the cited drugs in their pharmaceutical formulations. 相似文献
269.
Chiab Nour Kammoun Mariem Charfeddine Safa Bouaziz Donia Gouider Mbarka Gargouri-Bouzid Radhia 《Journal of plant research》2021,134(2):249-259
Journal of Plant Research - Potato plants are often exposed to biotic and abiotic stresses that negatively impact their growth, development, and yield. Plants respond to different stresses by... 相似文献
270.
Tayeb Daiboun Moulay Abdelaziz Elalaoui H al ne Thaler-Dao Claude Chavis Georges Maury 《Biocatalysis and Biotransformation》1993,7(4):227-236
Microsomal and cytosolic fractions of mammalian livers were screened for their capacity to resolve racemic mixtures of trans -2,3-epoxy-l-alkanols. The epoxide hydrolase activities showed some specificity for the 2S, 3S enantiomers which were attacked at the proximate carbon atom. The best resolutions were observed with guinea pig liver microsomal enzymes. 相似文献