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Potentiality of Different Seed Priming Agents to mitigate Cold Stress of Winter Rice Seedling

Phyton-International Journal of Experimental Botany 2021年第5期90卷 1491-1506页

作者： md.Parvez Anwar md.Ariful Islam Khalid A.K.m.mominul Islam Sabina Yeasmin Sharif Ahmed Adel Hadifa Ismail A.Ismail Akbar Hossain Ayman el Sabagh Agro Innovation Laboratory Department of AgronomyBangladesh Agricultural UniversityMymensingh2202Bangladesh International Rice Research Institute Bangladesh OfficeDhaka1213Bangladesh Rice Research and Training Center Field Crops Research InstituteAgricultural Research CenterSakha33717Egypt Department of Biology College of ScienceTaif UniversityTaif21944Saudi Arabia Bangladesh Wheat and maize Research Institute Dinajpur5200Bangladesh Department of Agronomy Faculty of AgricultureKafrelsheikh UniversityKafr Elsheikh33516Egypt

Seed priming has proved to be an effective pre-germ.nation seed invigoration technique for different crops to improve seed and seedling performance under different abiotic *** Bangladesh,winter rice is very often exposed to cold waves just after sowing in the nursery bed resulting in poor seed germ.nation and seedling emergence,yellowish and thin seedlings production,and a very low survival *** priming may mitigate the cold stress during seed germ.nation and seedling emergence and helps in the quality seedling production of winter *** evaluate the efficacy of different seed priming techniques in increasing seedling emergence,growth,vigor and survivability of winter rice cultivars under cold stress,a pot experiment was conducted at the Department of Agronomy,Bangladesh Agricultural University during December 2018 to January *** experiment comprised two factors,(A)Winter rice variety namely,(i)BRRI dhan29 and (ii)BRRI dhan36;(B)Seed priming agent namely (i)Control(no priming),(ii)20000 ppm.naCl,(iii)30000 ppm.naCl,(iv)20000 ppm KCl,(v)30000 ppm KCl,(vi)20000 ppm CaCl2,(vii)30000 ppm CaCl2,(viii)50 ppm CuSO4,(ix)75 ppm CuSO_(4),(x)10000 ppm ZnSO4,(xi)15000 ppm ZnSO4,(xii)2 ppm.na2moO4,(xiii)3 ppm.na2moO4,(xiv)100 ppm PEG(Polyethylene glycol 4000)and (xv)150 ppm *** were sown on two different dates viz.,1st December and 1st January so that seedlings are exposed to cold stress at different *** experiment was laid out in a completely randomized design(CRD)with three *** indicated that(in most of the cases)seed priming has a positive impact on seedling emergence rate(%),root length,shoot length,root shoot ratio,root dry weight,shoot dry weight,seedling dry weight and survival rate(%).Among the priming agents,KCl and CaCl2 performed best;while priming with naCl and PEG showed no advantages over no priming for both the sowing *** general,BRRI dhan36 performed better than BRRI dhan29 in terms of seedling growth because

关键词： Seed invigoration seedling emergence seedling mortality seedling growth low temperature stress

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Proximate and elemental Composition of Important Fish Species in makkah Central Fish market, Saudi Arabia

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Food and Nutrition Sciences 2016年第6期7卷 429-439页

作者： Shady m. el Shehawy Ali A. Gab-Alla Hamed m. A. mutwally Biology Department Faculty of Applied Science Umm Al-Qura University Makkah Saudi Arabia Food Industries Department Faculty of Agriculture Mansoura University Mansoura Egypt marine Biology Department Faculty of Science Suez Canal University Ismailia Egypt

In spite of the established nutritive value of seafood, fishes have a special ability to store some toxic substances such as heavy metals because of its own respiration system. The goal of current study was to explore the proximate chemical composition, minerals content and levels of heavy metals in edible portions of some important commercial fish species available at makkah Central Fish market, Saudi Arabia. The obtained results showed that Indian oil sardine fish had the highest value of crude oil (dry weight) recorded 38.00%, while, rusty parrot fish sample had the least of 1.17%. In contrast, rusty parrot fish had the highest value of crude protein represented 90.75% (dry weight), meanwhile, Indian oil sardine had the least of 54.19%. Consuming about 250 g of Indian oil sardine will cover 100% of Fe RDA (Recommended Dietary Allowances), eating 500 g of the same fish will cover about 30% of Ca RDA. While, 500 g of gilt head bream which has the highest content of K, na and mg will cover about 11.7%, 1.5% and 4.1% of these minerals RDA, respectively. As physical hazards, fourteen samples from the thirty three studied samples exceeded the permissible limit of Pb and Cd representing about 42%. Therefore, it is strongly recommended not to eat head, gills or viscera of all fishes.

关键词： Fish Proximate Chemical Composition minerals Heavy metals metal Pollution Index

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Spectral Properties of [(Ni0.45Co0.2Zn0.35F2O4)1–x(Sodium Acetylacetonate)x] nanocomposite

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Open Journal of Applied Sciences 2017年第1期7卷 15-30页

作者： O.m.Hemeda A.Tawfik D.E.el Refaey Adly H.el-Sayed Sh.mohamed Department of Physics Faculty of ScienceTanta UniversityTantaEgypt Department of Physics Faculty of ScienceSuez UniversitySuezEgypt Department of Physics Faculty of ScienceAlexandria UniversityAlexandriaEgypt Department of Physics Faculty of ScienceEl-Qassim UniversityEl-QassimSaudi Arabia

The pure spinel phase of Ni0.45Co0.2Zn0.35F2O4 was prepared by coprecipitation method and ceramic method. The nanocomposite [(NCZF)1–x(na(***))x] (x = 0%, 20%, 40%, 60%, 80%, 100%) was prepared by mixing two phases, Ni0.45Co0.2Zn0.35F2O4 with coprecipitation method [NCZF] and sodium acetylacetonate [na(***)]. The TEm photographs of the as prepared ferrite samples by coprecipitation method at different ratios of na(***) show that the crystalline cubic nanoparticles diameter were ranged from 26 - 36 nm and the particle size of na(***) is greater than NCZF. The same behavior has also confirmed by XRD pat-terns indicating polycrystalline nature of prepared sample. The comparison between the SEm micrographs for NCZF nanoparticles prepared by a) ceramic method and b) co-precipitation method was done to show the effect of preparation condition on the microstructure. IR analysis confirms the composites formation.

关键词： Spectral Properties nanocomposite SEm TEm IR

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Prelim.nary Study of Alkali Activation of Basalt: Effect of naOH Concentration on Geopolymerization of Basalt

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Journal of materials Science and Chemical Engineering 2017年第11期5卷 58-76页

作者： mohamed el-Shahte Ismaiel Saraya Ezzat el-Fadaly Department of Chemistry Faculty of Science Al-Azhar University Cairo Egypt Environmental Studies and Research Institute Sadat City University Sadat City Egypt

The main objective of this study is to examine the possibility of using fresh basalt powder in the preparation of geopolymer pastes. Four naOH concentrations of 2.5, 5, 7.5 and 10 m were used to alkali activation of basalt. In addition, effect of curing temperature at ambient, 45°C and 65°C were studied. The geopolymer pastes were investigated using FTIR, XRD and SEm-EDS techniques as well as compressive strength up to 90 days. The results were shown the compressive strength of prepared geopolymer increased with concentration of alkali activator up to 90 days. On the other hand, the compressive strength of prepared geopolymer pastes were improved with increased curing temperature. The results showed that there was a change in the chemical and mineral structure, due to the reaction of the sodium hydroxide with the different minerals of the basalt. In addition, the na/Al and Si/Al ratios were completely different from that of the raw basalt. The geopolymerization reactions occurred at the surface basalt and the unreacted basalt particles actually play a supporting role in the geopolymer properties.

关键词： Fresh Basalt Alkali Activation Geopolymer FTIR XRD EDS-SEm

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electrospinning of Gelatin Functionalized with Silver na-noparticles for nanofiber Fabrication

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modeling and Numerical Simulation of material Science 2013年第4期3卷 95-105页

作者： marwa A. Oraby Ahmed I. Waley Ahmed I. el-Dewany Ebtesam A. Saad Bothaina m. Abd el-Hady Biomaterials Department National Research Center Giza Egypt Chemistry Department Faculty of Science Ain Shams University Cairo Egypt natural Products Department National Research Center Giza Egypt Textile Department National Research Center Giza Egypt

The present paper deals with gelatin nanofibres functionalized with silver nanoparticles, prepared by electrospinning using solutions of gelatin mixed with silver nitrate (AgNO3). As a common solvent for gelatin and silver nitrate (AgNO3), a mixture of acetic acid and water (70:30 v/v) was selected. In this system, acetic acid was used as a solvent for gelatin, and at the same time reducing agent for silver ions in solution. Silver nanoparticles (nag) were stabilized through a mechanism that involves an interaction of the oxygen atoms of the carbonyl groups of gelatin. The viscosity and the conductivity of the gelatinous solutions were found to increase with the solution concentration. There is an observed decrease in the viscosity of the nag containing gelatin solutions with the aging time increasing, whereas the conductiity of the AgNO3—containing gelatin solutions was greater than that of the base gelatin solution. The gelatin nanofibres functionalized with silver nanoparticles were characterized by transmission electron microscopy (TEm), scanning electron microscopy (SEm), X-ray diffraction (XRD) and antimicrobial test. The results of investigations by TEm and XRD confirmed the presence of silver nanoparticles with diameters in the range of (2 - 10 nm), uniformly distributed over the surface of smooth nanofibres with an average diameter of 70 nm. The release of silver ions from both the 2- and 4-hrs crosslinked nag containing gelatin fiber mats by a total immersion method in buffer and distilled water occurred rapidly during the first 60 minutes, and increased gradually afterwards. Lastly, the tests demonstrated that gelatin/Ag nanofibers have a good antimicrobial activity against some common bacteria found on burned wounds. The anti-bacterial activity of these materials was greatest against Staphylococcus aureus, followed by Escherichia coli, and Pseudom.nas aeroginosa ≈ Candida albicans.

关键词： electrospinning Gelatin Silver nanofibers nanoparticles Antimicrobial Activity

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electric and magnetic Properties of [(NCZF)1-x(na(***))x] nanocomposite

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Open Journal of Applied Sciences 2017年第10期7卷 559-573页

作者： O. m. Hemeda A. Tawfik D. E. el Refaey Adly H. el-Sayed Sh. mohamed Departmentof Physics Faculty of Science Tanta University Tanta Egypt Departmentof Physics Faculty of Science Suez University Suez Egypt Departmentof Physics Faculty of Science Alexandria University Alexandria Egypt Departmentof Physics Faculty of Science El-Qassim University El-Qassim KSA

The pure spinel phase of Ni0.45Co0.2Zn0.35F2O4[NCZF] was prepared by co-precipitation method. The nanocomposite [(NCZF)1-x(na(***))x] (x = 0%, 20%, 40%, 60%, 80%, 100%) was prepared by mixing two phases: ferrite phase and ferroelectric phase. The magnetic characters of compo-sites performed using vibrating sample magnitude (VSm) at room temper-ature with maximum applied field up to 2 kG. For smaller particle size 30.89 nm. The saturation magnetization ms decreases linearly with increasing particle size. The effect of temperature on the electrical resistivity of the different composites samples was studied. It is noted that, the resistivity decreases with rising temperature to have a minimum value at ferroelectric transition temperature, above this value the resistivity increases. The dielectric constant increases with increasing temperature for all composites. The dielectric loss tan (δ) as a function of temperature sharply with temperature reached to maximum value at ferroelectric phase transition then decrease again.

关键词： Ferroelectric Ferrite Composites DC Conductivity

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Transposable elements in Escherichia coliantimicrobial resistance

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Advances in Bioscience and Biotechnology 2013年第3期4卷 415-423页

作者： Archana Iyer elie Barbour Esam Azhar Alaaeddin Ali el Salabi Hani mutlak A. Hassan Ishtiaq Qadri Adeel Chaudhary Adel Abuzenadah Taha Kumosani Ghazi Damanhouri maha Alawi Tarek na’was Afif m. Abdel Nour Steve Harakeh Department of Animal and Veterinary Sciences American University of Beirut Beirut Lebanon Department of Biochemistry King Abdulaziz University Jeddah KSA Infection Control and Antimicrobial Drug Resistance University of Benghazi Benghazi Libya Infection Control and Environmental Health Unit King Abdulaziz University Hospital King Abdulaziz University Jeddah KSA King Fahd medical Research Center King Abdulaziz University Jeddah KSA Lebanese American University Beirut Lebanon Special Infectious Agents Unit—Biosafety Level 3 King Fahd Medical Research Center King Abdulaziz University Jeddah KSA

Transposable elements are capable of switching their positions on the genome thereby causing gene arrangements and contributing to genome evolution. The aim of this review is to specifically discuss the role of transposable elements in transferring antimicrobial resistance genes in E. coli, thus contributing to increase in virulence and conferring the possibility of multidrug resistance. Different types of transposable elements such as transposons and integrons and their profound influence on E. coli antimicrobial resistance are the focus of this review.

关键词： Transposable elements E. coli Antimicrobial Resistance Integrons

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Response of Alfalfa under Salt Stress to the Application of Potassium Sulfate nanoparticles

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American Journal of Plant Sciences 2017年第8期8卷 1751-1773页

作者： mahmoud Samir el-Sharkawy Talaat Rizk el-Beshsbeshy Esawy Kasem mahmoud nasser Ibrahim Abdelkader Rania mohamed Al-Shal Ali m. missaoui Soil Science and Water Department Faculty of Agriculture Tanta University Tanta Egypt Department of Crop and Soil Sciences and Institute of Plant Breeding Genetics and Genomics University of Georgia Athens GA USA

A greenhouse study was conducted to explore the effect of various rates of potassium sulfate (K2SO4) nanoparticles on alfalfa (medicago sativa L.) growth and physiological response under salt stress. One salt-tolerant genotype (mesa-Sirsa) and one salt-sensitive genotype (Bulldog 505) were selected based on germ.nation under salt and were planted in pots containing 2 kg of sand. The two genotypes were subjected to 0 and 6 dS·m-1 salt levels using CaCl2·2H2O: naCl (2:1) mixed with Hoagland solution. Three K2SO4 nanoparticle treatments consisting of, 1/4, 1/8, and 1/10 of the potassium (K) level in full strength Hoagland solution (235 mg·L-1) were applied. Adding K2SO4 nanoparticles at the 1/8 level resulted in the highest shoot dry weight, relative yield, root length and root dry weight in both genotypes. The different rates of K2SO4 nanoparticles affected significantly na/K ratio and the concentrations of Calcium (Ca), Phosphorus (P), Copper (Cu), manganese (mn), and Zinc (Zn) in plant tissue. The application of K2SO4 nanoparticles at the 1/8 rate enhanced the plant’s physiological response to salt stress by reducing electrolyte leakage, increasing catalase and proline content, and increasing antioxidant enzymes, activity. These results suggest that the application of K nanoparticles may have better efficiency than conventional K fertilizers in providing adequate plant nutrition and overcoming the negative effects of salt stress in alfalfa.

关键词： Alfalfa nanoparticles Salt Stress Potassium

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Effect of La on the Corrosion Behavior and mechanism of 3Ni Weathering Steel in a Simulated marine Atmospheric Environment

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Acta metallurgica Sinica(English Letters) 2024年第2期37卷 308-324页

作者： Gang Niu Rui Yuan R.D.K.misra na Gong Zhi-Hui Zhang Hao-Xiu Chen Hui-Bin Wu Cheng-Jia Shang Xin-Ping mao Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX79968USA Institute of materials Research and Engineering Agency for ScienceTechnologyand ResearchSingapore138634Singapore Department of materials Science and Engineering University of TorontoTorontoONM5S 3E4Canada

The corrosion behavior and mechanism of 3Ni weathering steel in a simulated oceanic atmospheric environment are investigated in order to comprehend the impacts of La,as determined through electrochemical analysis and rust layer *** results of this study demonstrate that the addition of La enhances the corrosion resistance of 3Ni weathering steel in the marine atmospheric environment,thereby reducing the corrosion rate and improving the protection of the rust *** influence of La on corrosion resistance can be attributed to two primary ***,La functions as a grain refiner,minimizing the potential difference of the micro-regions on the substrate surface,thereby significantly reducing the corrosion of bare steel in the marine ***,La inhibits the process of Fe_(3)O_(4) oxidation back toγ-FeOOH during corrosion at the local site,thus decreasing the formation ofγ-FeOOH and enhancing the charge transfer *** research work may serve as a reference for expanding the application of rare earth elements in the field of weathering steel.

关键词： Weathering steel Rare earth Rust layer Corrosion behavior Corrosion resistance

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The development of ultralightweight expanded perlite-based thermal insulation panel using alkali activator solution

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Frontiers of Structural and Civil Engineering 2022年第11期16卷 1486-1499页

作者： Damla Nur CelIK Gökhan DURmUŞ Civil Engineering Department Technology FacultyGazi UniversityAnkara 06500Turkey

The International Energy Agency(IEA)states that global energy consumption will increase by 53%by *** has 70%of the world’s perlite reserves,and in order to reduce energy consumption a thermal insulation panel was developed in Turkey using different particle sizes of expanded perlite(EP).In this study,0–1.18 mm(powder)and 0–3 mm(granular)EP particle sizes were selected,since they have the lowest thermal conductivity coefficients among all the particle *** addition,an alkali activator solution was used as a binder in the *** alkaline activator solution was obtained by mixing sodium hydroxide solution(6,8,10,and 12 mol·L−1)and sodium silicate(module 3)at the different ratios of na2SiO3 to naOH of 1,1.5,2,and *** study aimed to experimentally determine the optimum binder and distribution ratio of EP,with the lowest coefficient of thermal conductivity and the lowest *** lowest thermal conductivity and the lowest density were determined as 0.04919 W·m−1·K−1 and 133.267 kg/m3,respectively,in the sample prepared with 83.33%powder-size EP,6 mol·L−1 sodium hydroxide solution,and ratio of na2SiO3 to naOH of *** density,thermal conductivity,and compressive strength of the sample showed the same trends of behavior when the na2SiO3 to naOH ratio was *** addition,the highest compressive strength was measured in 12 mol·L−1 naOH concentration regardless of particle *** conclusion,the study predicts that the EP-based thermal insulation panel can be used as an insulation material in the construction industry according to the TS825 Thermal Insulation Standard.

关键词： expanded perlite alkali activator thermal insulation panel thermal conductivity

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