检索结果-南通市图书馆

Salt response of the freshwater microalga Scenedesmus obliquus(Turp.)Kutz is modulated by the algal growth phase

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2020年第3期38卷 802-815页

作者： Taha Mohamed el-KATONY magda Faiz el-ADL Department of Botany and Microbiology Faculty of ScienceDamietta UniversityNew Damietta City 34517Egypt

Growth and biochemical responses of the coenobial green alga Scenedesmus obliquus to salinity stress were monitored across different phases of *** alga was cultured on BG11 growth medium and subjected to 0,30,100,and 200 mmol/L NaCl for a period of 20 d,during which algal cultures were harvested at 4-d *** salinity-induced inhibition of algal growth was accompanied with prolongation of timing of the different growth *** sharp and progressive salinity-induced inhibition of algal growth rate during the early phase of growth points to salt shock but moderation of inhibition at the subsequent stages of growth means algal acclimation to *** concentrations of chlorophylls a and b,soluble sugars,proteins as well as those of K+and Na+in the alga exhibited peaks at the initiation of the exponential phase of growth,with increasing magnitude in proportion to the increase in the level of ***,whereas soluble sugars of the alga peaked at initiation of the exponential phase,starch concentration progressively increased with culture age,reaching saturation towards the stationary *** the salinity-induced increase in soluble sugars was most evident at the early stages of growth the reverse was true for *** present results point to fast acclimation of *** to salt stress post a brief salt shock,utilizing soluble sugars,K+and Na+for osmotic *** salinity from 0 to 200 mmol/L NaCl led to progressive increase in soluble sugars,proteins,K+and Na+concentrations of the algal cells,particularly at the early stages of ***,the salinity-induced increase in chlorophyll concentration approached a limit at 100 mmol/L NaCl whereas that in starch concentration was more evident at the later stages of growth.

关键词： carbohydrates growth phase minerals protein salt stress Scenedesmus obliquus

In vitro efficacy of new synthetic benzimidazole-related compounds against Schistosoma mansoni adult worms

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2020年第12期13卷 566-572页

作者： Amira Taman Samia el-Bardicy Menerva Tadros magda Ayoub Basem Mansour Fouad el-Shehabi Samar Nel-Beshbishi Department of Medical Parasitology Faculty of MedicineMansoura UniversityMansoura 35516Egypt Department of Medical Malacology Theodor Bilharz Research InstituteImbabaCairoEgypt Department of Pharmaceutical Chemistry Faculty of PharmacyDelta University for Science and TechnologyGamasa CityMansouraEgypt Department of Biological Sciences and Biotechnology Faculty of ScienceThe Hashemite UniversityZarqa 13115Jordan

Objective:To evaluate the in vitro antischistosomal activity of two new synthetic benzimidazole-related compounds:NBTP-OH and ***:Schistosoma adult worms were recovered from mice infected with Schistosoma mansoni cercaria,washed and then incubated in the culture media with different concentrations of compounds NBTP-OH and NBTP-F up to 72 *** electron microscopy was conducted to report morphological ***:Incubation of adult Schistosoma mansoni with 10 μg/mL of NBTP-OH for 48 h killed 81.25% of *** calculated LC50and LC90 72 h post-incubation were 6.8 μg/mL and 9.8 μg/mL,*** of worms to 10 μg/mL of NBTP-F killed89.5% of worms after 48 h,mostly males(83.3%),the LC50 and LC90 after 72 h of incubation were 4.8 μg/mL and 6.9 μg/mL,*** incubated for 72 h with these compounds revealed swelling and deformity of oral sucker,disorganization and erosion of the tegument when examined with scanning electron ***:NBTP-OH and NBTP-F possess in vitro antischistosomal activities;however,in vivo studies should be conducted to examine their antischistosomal effects..

关键词： Schistosoma synthetic swelling

Perceived Stress, Anxiety and Insomnia among Nursing Staff in Saudi Arabia during the 2019 Novel Coronavirus Disease Pandemic

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Nursing 2022年第1期12卷 1-11页

作者： magda M. Agameel Sahar A. Abd-el Mohsen Nagda A. Dyab Amal Yousef Abdelwahed Razan Adel Fakieh Department of Nursing College of Applied Medical Sciences Prince Sattam Bin Abdulaziz University Wadi Eldawaser Saudi Arabia Department of Gerontolgical Nursing Faculty of Nursing Damanhour University Damanhour Egypt Department of Medical Surgical Nursing Faculty of Nursing Asyut University Asyut Egypt Department of Nursing Alghad International College for Applied Medical Science Abha Saudi Arabia Department of Community Health Nursing Faculty of Nursing South Valley University Qena Egypt Department of Public Health College of Health Sciences Saudi Electronic University Dammam Saudi Arabia Department of Community Health Nursing Faculty of Nursing Damanhour University Damanhour Egypt

Background: Nursing staff exposed to 2019 novel coronavirus disease which might be at the increased risk of development mental health problems such as stress, anxiety and insomnia. Objectives: To estimate the spread of stress, anxiety and insomnia among the nursing staff who are working at Asir central hospital, Kingdom of Saudi Arabia. Methods: This study was a descriptive cross-sectional study, that involved with a 53 (44 Female and 9 Male) nurses who are working at Asir central hospital, Kingdom of Saudi Arabia. A convenient sampling technique was used to select the participants during the period from October to the mid of November 2020. A structured closed-ended questionnaire was used related with three standard tools (The Perceived Stress Scale, Generalized Anxiety Disorder and the Insomnia severity index). Results: The results revealed that 90.6% of participants had moderate stress and 7.5% showed low stress. Regarding anxiety, 37% of nurses had mild anxiety, 28.3% and 34% had moderate and severe anxiety, respectively. Moreover, sub-threshold insomnia was observed in 60.4% and clinical insomnia in 15% of study candidates. Additionally, a statistically significant association was found between levels of stress, anxiety and insomnia and the age of the studied nurses (P = 0.00). Conclusion: The results of this study showed that the spread of stress, anxiety and insomnia, was higher than some studies which have been reported in the previous researches. Significant difference was observed between mental distress and age of nurses, while there was no significant difference between the studied mental health problems and gender.

关键词： Anxiety COVID-19 Nursing Staff Insomnia Stress

Preservability of rabbit semen after chilled storage in tris based extender enriched with different concentrations of Propolis ethanolic extract (PEE)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian pacific Journal of Reproduction 2017年第2期6卷 68-76页

作者： Islam el-Sayed el-Seadawy Walid Said el-Nattat magda Mohamed el-Tohamy Samy Ali Hussein Aziza Yakot Abdelfattah el-Senosy Ahmed Said Hussein Animal Reproduction and A I Dept.Veterinary Research DivisionNational Research CentreGizaEgypt Biochemistry and Clinical Biochemistry Dept. Faculty of Veterinary MedicineBenha UniversityEgypt Food Industry Dept Food Industry and Nutrition Research DivisionNational Research CenterGizaEgypt

Objective:To maintain semen quality of male rabbits during chilled storage by enrichment the tris based diluent with different concentrations of propolis ethanolic ***: Total phenolic and total flavonoid contents, as well as antioxidant activity was determined in propolis ethanolic extract (PEE). The extract was analysed by HPLC for separation and identification of target metabolites. Semen was collected from 10 rabbit bucks, pooled, then divided into five aliquots (each of 500 μL) and diluted each in 5 mL Tris-citric acid-glucose-egg yolk extender (TCGY). The 1st aliquot served as control while PEE was added at concentration of 0.8, 1.2, 1.6 and 2.0 mg/5 mL tris extender in the aliquot 2, 3, 4 and 5 respectively. Diluted semen samples were subjected to cooling at 4℃ for 72 h. Sperm motility, sperm viability, sperm abnormality, sperm membrane integrity and acrosome integrity were evaluated in chilled semen allover the chilling ***:The resluts revealed presence of a considerable amount of total phenolic compounds (98.67 mg GAE/g extract) and total flavonoids (70.16 mg CE/g extract) which were parallel to an antioxidant activity assessed as ABTS, DPPH and FRAP (198.65, 180.18 and 306.17 mM TE/g extract respectively). The dominant phenolic acid was chlorogenic acids (3.959 mg/g extract). Other compounds were found in less amounts rosmarinic acid (3.959 mg/g extract), myrcetin (1.946 mg/g extract), kaempferol (1.089 mg/g extract) and apeginin-7-glucoside (1.113 mg/g extract). Obtained results clearly demonstrated that the addition of (1.2-1.6) mg PEE in the chilled extended rabbit semen proved to be beneficial for maintaining semen characteristics compared to control and the addition of 0.8 and 2 mg ***: The enrichment of rabbit semen tris-basic extender with (1.2-1.6) mg PEE/5 mL tris-extender (as the best and safe concentrations) maintain the sperm characteristics in good condition all over 72 h of chilling.

关键词： Male rabbits Semen extender Propolis extract Antioxidants HPLC

Effect of Molybdate Ions on the Corrosion Behaviour of Ti Alloys

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2000年第1期16卷 45-49页

作者： magda.M.A.Gad, Kamal.E.Mohamed and Abdelwahab A.el-Sayed (Metallurgy Dept., Materials Division, Atomic Energy Authority, Cairo, Egypt) Metallurgy Dept. Materials Division Atomic Energy Authority Cairo Egypt

Titanium alloys are extensively used in power, chemical and petroleum industries as constructional materials for vessels and heat transfer tubes. Moreover they are candidate materials for nuclear waste disposal. These alloys have superior resistance to localized forms of corrosion compared to stainless steels and Ni-base alloys. However, this resistance is not as remarkable in crevice corrosion conditions in some aggressive media. electrochemical corrosion tests were conducted on two ASTM Ti grades namely, Ti-2 and Ti-12 in extremely low pH acidic environment. Results indicated that Ti-2 has less resistance to both general and crevice corrosion attack than Ti-12. Both alloys possess better resistance to general corrosion than to crevice corrosion. Also, results showed that the molybdate addition improves remarkably the resistance of Ti-2 to both types of attack. The increase of molybdate ions concentration from 0.03 mol/L to 0.15 mol/L made Ti-2 to be as resistant as, or somewhat higher than, Ti-12. The elecrochemical findings were further supplemented by optical examination of the corroded surface.

关键词： Ti Mo Effect of Molybdate Ions on the Corrosion Behaviour of Ti Alloys

Fast photocurable thiol-ene elastomers with tunable biodegradability,mechanical and surface properties enhance myoblast differentiation and contractile function

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2021年第7期6卷 2120-2133页

作者： Mohamed Alaa Mohamed Aref Shahini Nika Rajabian Julia Caserto Ahmed M.A.el-Sokkary magda A.Akl Stelios T.Andreadis Chong Cheng Department of Chemical and Biological Engineering University at BuffaloThe State University of New YorkBuffaloNY14260USA Chemistry Department College of ScienceMansoura UniversityMansoura35516Egypt Department of Biomedical Engineering University at BuffaloThe State University of New YorkBuffaloNY14260USA Center of Excellence in Bioinformatics and Life Sciences BuffaloNY14263USA

Biodegradable elastomers are important emerging biomaterials for biomedical applications,particularly in the area of soft-tissue engineering in which scaffolds need to match the physicochemical properties of native ***,we report novel fast photocurable elastomers with readily tunable mechanical properties,surface wettability,and *** elastomers are prepared by a 5-min UV-irradiation of thiol-ene reaction systems of glycerol tripentenoate(GTP;a triene)or the combination of GTP and 4-pentenyl 4-pentenoate(PP;a diene)with a carefully chosen series of di-or *** the subsequent application study,these elastomers were found to be capable of overcoming delamination of myotubes,a technical bottleneck limiting the in vitro growth of mature functional *** glycerol-based elastomers supported the proliferation of mouse and human myoblasts,as well as myogenic differentiation into contractile *** notably,while beating mouse myotubes detached from conventional tissue culture plates,they remain adherent on the elastomer *** results suggest that these elastomers as novel biomaterials may provide a promising platform for engineering functional soft tissues with potential applications in regenerative medicine or pharmacological testing.

关键词： Biodegradable elastomers Cell culture substrate Skeletal muscle regeneration Thiol-ene synthesis Tissue engineering

109例可行手术的乳腺癌病例的临床病理学研究及治疗效果:来自埃及开罗大学国家肿瘤研究所的经验报道(英文)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Chinese-German Journal of Clinical Oncology 2010年第7期9卷 409-415页

作者： magda el Mongy Hesham el Hossieny Farouk Haggag Rania Fathy Department of Radiation Oncology National Cancer InstituteCairo University Department of Clinical Oncology Kasr El-Aini Centre Cairo University

Objective: This retrospective study was designed to evaluate clinico-pathological data including stage, results of treatment, and prognostic factors which affect the overall survival & disease free survival. Methods: This was a retrospective study carried out at the Radiotherapy Department, National Cancer Institute, Cairo University, Egypt on 1009 patients treated for primary breast cancer between 1999-2003. Results: The median follow-up was 68 months. Loco regional relapse occurred in 23 patients (2.3%) and distant relapse occurred in 203 patients (20.1%). Both loco regional and distant relapse were reported in 32 patients (3.2%). The disease free survival (DFS) at 3 and 5 years were 87% and 78% respectively, while OAS at 3 and 5 years were 96.4% and 91.4% respectively. Multivariate analysis of different prognostic factors showed that the independent bad prognostic factors in the study for disease relapse were positive lymph nodes (LNs, more than 10), tumor size T3, T4 with significance of 0.0001 for each, and pathologic grade with significance of 0.003. Conclusion: The most important independent bad prognostic factors for relapse are positive LNs more than 10, tumor size T3, T4 and pathologic grade. The timing of radiotherapy affects the disease free survival significantly also it is recommended to analyze the group of patients with LNs negative using well designed randomized trials.

关键词：临床病理治疗效果乳腺癌大学开罗埃及 NCI ngl

Natural radioactivity levels and radiation hazards for gypsum materials used in Egypt

在线全文

学校读者我要写书评

暂无评论

Natural Science 2014年第1期6卷 5-13页

作者： Ahmed Hassan Korna Soad Saad Fares magda Abd el-Rahman Department of Physics Faculty of Science Al Baha University Al Bahah KSA Department of Radiation Physics National Center of Radiation Research and Technology NCRRT Atomic Energy Authority Cairo Egypt

Radionuclides naturally occurring in building materials may significantly contribute to the annual doses to the public. For instance, familiar building materials such as the concrete and gypsum board have been reported to produce a dose of about 0.04 mSv per year for a typical person (NCRP 1987c). External as well as internal exposures are two pathways of radiation dose imparted to human beings from the building materials. As information on the radioactivity of such materials is lacking, the study of gypsum materials used in Egypt was carried out in order to estimate the annual dose to the Egyptian population due to natural radionuclides in building materials. During the study, 18 samples of commonly used gypsum raw materials were collected and measured. The activity concentrations were determined by gamma ray spectrometry. Their mean values were in the ranges of 499.29 ± 11.53 Bq·kg-1 for 40K, 91.97 ± 2.61 Bq·kg-1 for 226Ra, 37.62 ± 1.67 Bq·kg-1 for 238U and 42.27 ± 2.22 Bq·kg-1 for 232Th. The activity indexed Iγ for 18, different gypsum samples varied from 0.31 ± 0.03 to 2.3 ± 0.19 and the radium equivalent activity (Raeq), from 38.81 ± 1.68 to 324.7 ± 9.42. These values are lower than the limit of 370 Bq·kg-1 adopted by the Organization for Economic Cooperation and Development (OECD). The average indoor annual effective gamma dose rate (DE) in (mSv/y) for the people, caused by the building materials of dwellings, was assessed for most commonly gypsum materials. It was estimated to be in the range from 0.10 ± 0.003 mSv/y to 0.74 ± 0.08 mSv/y. The internal and external hazard indices (Hin, Hex) and the absorbed dose rate in air D in each sample were evaluated to assess the radiation hazard for people living in dwelling made of the studied materials. The absorbed dose rate of indoor air in samples G1, G2, G11, G17 and G18 is less than the international recommended value which is 55 nGyh-1. While the absorbed dose rate for samples G3, G4, G5, G6, G7, G8, G9, G10, G12

关键词： Gypsum Gamma Spectrometer Hazard Indices NORM Building Materials

Temporal variation in chemical composition of Dictyota dichotoma (Hudson) J.V. Lamouroux (Dictyotales,Phaeophyceae) from Red Sea Coast, Egypt

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Coastal Life Medicine 2017年第4期5卷 149-155页

作者： Mohamed Ali Deyab Taha Mohamed el-Katony magda Faiz el-Adl Fatma Mohamed Ward Department of Botany and Microbiology Faculty of ScienceDamietta UniversityNew DamiettaEgypt

Objective: To relate the chemical composition of Dictyota dichotoma (Hudson) *** (D. dichotoma) to variation of water characteristics at Hurghada, ***: Sea water and D. dichotoma fronds were collected from Hurghada shores, during autumn of 2014. Water samples were analyzed and fronds of D. dichotoma were biochemically ***: Sea water was characterized with high levels of salinity, P and heavy metals but with low content of nitrogen. The confined nature and the high evaporation of the Red sea contribute to the high salinity while the mining and transportation of phosphatic ore in the nearby region contribute to the high load of P and heavy metals. With the progress of season from September to November, water temperature was markedly reduced whereas pH and ionic content of water was reduced to a lesser extent, with marked alteration in ionic composition. With the progress of season towards winter, there was marked reduction in mineral composition of the fronds, shift in frond composition in favor of carbohydrates at the expense of proteins, lipids and alginates;and shift in the pigment composition in favor of chlorophylls at the expense of carotenoids and ***: These facts point to active growth and photosynthetic activity during the cold period;that is, D. dichotoma is a cold water alga. D. dichotoma had moderate nutritive value, with moderate contents of carbohydrates, proteins, lipids and minerals. The mineral accumulation capacity of the fronds was more evident for N, P and K than for Ca, Mg and heavy metals.

关键词： Alginates Minerals Pigments Red sea