Učinak temperature i dodatka indija na mehanička svojstva legure Al–0.21wt%Au

Tensile characteristics of both Al–0.21wt%Au and Al–0.21wt%Au–0.21wt%In alloys were investigated in the temperature range 493 K to 553 K. The coefficient of work hardening, χ = ∂σ2/∂², yield stress, σy, and fracture stress, σf , decreased with increasing deformation temperature (T) and exhibited abrupt increase at about 523 K. On the other hand, the fracture strain, ²f , and dislocation slip distance, L, increased with increasing deformation temperature and exhibited minima at about 523 K. The activation energy was determined in the range around 523 K to clarify the observed change in the behaviour of the hardening characteristics of the investigated samples.Istraživali smo istezna svojstva legura Al–0.21wt%Au i Al–0.21wt%Au–0.21wt%In na temperaturama 493 K do 553 K. Koeficijent mehaničkog očvršćivanja, χ = ∂σ2/∂², granica elastičnosti, σy, i granica loma, σf , smanjuju se pri povišenim temperaturama istezanja (T) te pokazuju nagao porast na oko 523 K. Nasuprot tome, lomno istezanje, ²f , i prosječna duljina klizanja dislokacija, L, povećali su se s povišenom temperaturom istezanja, a pokazuju i minimum na oko 523 K. Radi objašnjenja opaženih promjena u procesu očvršćivanja ispitivanih uzoraka odredili smo aktivacijsku energiju na temperaturama oko 523 K

Učinak temperature i dodatka indija na mehanička svojstva legure Al–0.21wt%Au

Tensile characteristics of both Al–0.21wt%Au and Al–0.21wt%Au–0.21wt%In alloys were investigated in the temperature range 493 K to 553 K. The coefficient of work hardening, χ = ∂σ2/∂², yield stress, σy, and fracture stress, σf , decreased with increasing deformation temperature (T) and exhibited abrupt increase at about 523 K. On the other hand, the fracture strain, ²f , and dislocation slip distance, L, increased with increasing deformation temperature and exhibited minima at about 523 K. The activation energy was determined in the range around 523 K to clarify the observed change in the behaviour of the hardening characteristics of the investigated samples.Istraživali smo istezna svojstva legura Al–0.21wt%Au i Al–0.21wt%Au–0.21wt%In na temperaturama 493 K do 553 K. Koeficijent mehaničkog očvršćivanja, χ = ∂σ2/∂², granica elastičnosti, σy, i granica loma, σf , smanjuju se pri povišenim temperaturama istezanja (T) te pokazuju nagao porast na oko 523 K. Nasuprot tome, lomno istezanje, ²f , i prosječna duljina klizanja dislokacija, L, povećali su se s povišenom temperaturom istezanja, a pokazuju i minimum na oko 523 K. Radi objašnjenja opaženih promjena u procesu očvršćivanja ispitivanih uzoraka odredili smo aktivacijsku energiju na temperaturama oko 523 K

GROWTH AND PRODUCTIVITY OF EGGPLANT AS AFFECTED BY PINK PIGMENTED FACULTATIVE METHYLOTROPHIC BACTERIA

The present study was suggested as an attempt to investigate the effects of Pink Pigmented Facultative Methylotrophic Bacteria (PPFM) dipping and foliar spray on vegetative growth and yield of eggplant (Solanum melongena L.). Field experiments were carried out during the summer seasons of 2014 and 2015 at the Experimental Farm, Faculty of Agriculture, Ain Shams University. The vegetative growth of eggplant responded positively to dipping seedlings in PPFM which gave the highest values of growth parameters, i.e. number of leaves per plant, leaf area, nitrogen & potassium concentration in leaf and total protein in fruit, in the two seasons as compared with control (dipping in water). The application of PPFM as foliar spray, increased significantly plant growth (plant length, leaf number, potassium concentration in leaf, vitamin "C" in fruit and total yield per plant) in the two seasons as compared with the other studied foliar application treatments. The interaction between dipping seedlings in PPFM and PPFM foliar spray with all concentrations gave synergistic effects on growth parameters and yield components of eggplant, during the two growing seasons as compared with either individual foliar application or control plants

Heat shock protein 60 and chromatin assembly factor-1 mRNA levels in hepatitis C virus-related hepatocellular carcinoma and clinical significance

Background: Hepatocellular carcinoma (HCC) is the third cause of cancer-related death worldwide. Heat Shock protein 60 (HSP60), a mitochondrial chaperone, is overexpressed in diverse malignant cells. Chromatin Assembly Factor-1 (CAF-1), a histone chaperone, is down-regulated in quiescent non-proliferating human cells. We aimed to clarify the role of HSP60 and CAF-1 mRNA expression in diagnosis of HCC post-HCV infection.Methods: HSP60 and CAF-1 mRNA levels in urine and blood were quantified by Taqman real-time PCR in 49 subjects; 25 cirrhotic with HCV-related HCC, 12 cirrhotic without HCC and 12 healthy controls.Results: HSP60 and CAF-1 mRNA levels in urine and blood were significantly higher in HCC versus cirrhosis and controls, and in cirrhosis versus controls. Their levels in HCC were significantly increased by advancement of HCC BCLC staging system. HSP60 in urine had 85% sensitivity and 66% specificity at cut off 258354 RU and 85% sensitivity and 60 % specificity at cut off 37576 RU in blood for HCC diagnosis. CAF-1 in urine had 81% sensitivity and 66% specificity at cut off 137756 RU and 77% sensitivity and 64% specificity at cut off 49726 RU in blood for HCC diagnosis. HSP60/CAF-1 sensitivity and specificity in urine and blood were better than either marker alone, with better results in urine (91% and 73%, respectively) than blood (88% and 66%, respectively).Conclusions: HSP60 and CAF-1 in urine and blood may be useful HCC diagnostic markers that were correlated with advancement of HCC with better combined marker sensitivity and specificity than either marker alone especially for urine

Caracterización estructural y actividad biológica de sulfolípidos de algas marinas seleccionadas

The sulfolipid classes (SLs) in the total lipids of five species of marine algae, two species of Rhodophyta (Laurencia popillose, Galaxoura cylindriea), one species of Chlorophyta (Ulva fasciata), and two species of Phaeophyta (Dilophys fasciola, Taonia atomaria) were separated and purified on DEAE-cellulose column chromatography. The SLs component was identified by IR, gas chromatography MS/MS and liquid chromatography MS/MS. The level of SLs contents va ried from 1.25% (in L. papillose) to 11.82% (in D. fasciola) of the total lipid contents. However, no significant differences in sulfate content (0.13 – 0.21%) were observed among all these algae species. All SLs were characterized by high contents of palmitic acid (C 16:0), which ranged from 30.91% in G. cylindriea to 63.11% in T. atomatia. The main constitutes of algal sulfolipids were identified as sulfoquinovosyl-di-acylglycerol and sulfoquinovosyl acylglycerol. The sulfolipids of different algal species exhibited remarkable antiviral activity against herps simplex virus type 1 (HSV-1) with an IC50 ranging from 18.75 to 70. 2 μg mL–1. Moreover, algal sulfolipid inhibited the growth of the tumor cells of breast and liver human cancer cells with IC50 values ranging from 0.40 to 0.67 μg mL–1 for human breast adenocarcinoma cells (MCF7).Se separaron diferentes clases sulfolípidos (SL) a partir de los lípidos totales de cinco especies de algas marinas: una especie de Chlorophyta (Ulva fasciata), dos especies de Phaeophyta (Dilophys fasciola, Taonia atomaria) y dos especies de Rhodophyta (Laurencia popillose, Galaxoura cylindriea) que se purificaron mediante cromatografía en columna de DEAE-celulosa. Los components de SLs fueron identificados por IR, cromatografía de gases MS/MS y cromatografía líquida MS/ MS. Los contenidos de SL en relación al total de lípidos varió de 1,25% (en L. papilosa) al 11,82% (en D. fasciola). Sin embargo, no hay diferencias significativas en el contenido de sulfato observado entre todas estas especies de algas (desde 0,13 hasta 0,21%). Todos los SL se caracterizaron por un alto contenido de ácido palmítico (C16:0), que osciló entre 30,91% en G. cylindriea a 63,11% en T. atomatia. Sulfoquinovosyl-di-acilglicerol y acilglicerol sulfoquinovosyl fueron identificados como los principales constituyentes de los sulfolípidos de estas algas. Los sulfolípidos de las diferentes especies de algas estudiadas mostraron una notable actividad antiviral contra el virus del herpes simple tipo 1 (VHS-1) con una IC50 que osciló entre 18,75 y 70. 2 g mL–1. Por otra parte, los sulfolípidos de estas algas inhibieron el crecimiento de células tumorales de mama y células de cáncer de hígado humano con valores de IC50 que van desde 0,40 hasta 0,67 g mL–1 para las células de adenocarcinoma de mama humano (MCF7)

Model Free Approach for Non-Isothermal Decomposition of Un-Irradiated and γ-Irradiated Silver Acetate: New Route for Synthesis of Ag2O Nanoparticles

Kinetic studies for the non-isothermal decomposition of unirradiated and γ-irradiated silver acetate with 103 kGy total γ-ray doses were carried out in air. The results showed that the decomposition proceeds in one major step in the temperature range of (180–270 °C) with the formation of Ag2O as solid residue. The non-isothermal data for un-irradiated and γ-irradiated silver acetate were analyzed using Flynn-Wall-Ozawa (FWO) and nonlinear Vyazovkin (VYZ) iso-conversional methods. These free models on the investigated data showed a systematic dependence of Ea on α indicating a simple decomposition process. No significant changes in the thermal decomposition behavior of silver acetate were recorded as a result of γ-irradiation. Calcinations of γ-irradiated silver acetate (CH3COOAg) at 200 °C for 2 hours only led to the formation of pure Ag2O mono-dispersed nanoparticles. X-ray diffraction, FTIR and SEM techniques were employed for characterization of the synthesized nanoparticles

Genotype Dependent Somatic Embryogenesis from Egyptian Rice Mature Zygotic Embryos

Abs tract: Seven agronomically and genetically different rice (Oryza sativa L.) c u lt iv a rs were compared for their capacity for callus induction and plant regene ra t io n from mature zygotic embryos . W hite embryonic calli were formed within three weeks in the pres ence of 3 mgl 2,4,D . T h e s o matic Giza 178 s howed high regeneration fre q u e ncy (39%) followed by Giza 175 (38%) where the cultivar H1 s howed the lowes t record (24%). The data obtained fro m t h e random amplified polymorphic DNA analys is s howed that a total of 45 DNA markers were detected among the s e v e n ric e cultivars of wh ich, 29 bands were polymorphic (64.4%) and can be cons idered as us eful RA PD markers for th e rice cultivars us ed. Based on the data obtained by RA PD analys is , it was pos s ible to dis c riminate between the different genotyp e s u s e d . Sixteen out of the twenty nine polymorphic RAPD markers generated were found to be genotype-specific. Thes e markers can be verified as being RAPD markers ass ociated with the rege n e ra t io n c a pacity in the s even rice genotypes. Genetic s tability in tis s uecultured rice plants was examined by randomly amplified polymorphic DNA (RA PD) an a ly s is . T he genetic s imilarity between the mother and the regenerated plants was hig h fo r Giza 178 (91%) and it w a s 87.5 and 82 for Giza 175 and Sakha 102 respectively. The cultivar Giza 178 proved t o b e a us eful genetic res ource with unique regeneration ability and can be us ed for efficient generation of trans genic rice plants

The semileptonic decays of the B_c meson

We study the semileptonic transitions B_c to \eta_c, J/\psi, D, D^*, B, B^*, B_s, B_s^* in the framework of a relativistic constituent quark model. We use experimental data on leptonic J/\psi decay, lattice and QCD sum rule results on leptonic B_c decay, and on radiative \eta_c transitions to adjust the quark model parameters. We compute all form factors of the above semileptonic B_c-transitions and give predictions for various semileptonic B_c decay modes including their \tau-modes when they are kinematically accessible. The implications of heavy quark symmetry for the semileptonic decays are discussed and are shown to be manifest in our explicit relativistic quark model calculation. A comparison of our results with the results of other calculations is performed.Comment: 31 pages Latex (uses epsf, revtex). Section II expanded, typos corrected. This version will appear in Phys. Rev.

Synergistic advancements in sewage-driven microbial fuel cells: novel carbon nanotube cathodes and biomass-derived anodes for efficient renewable energy generation and wastewater treatment

Microbial fuel cells (MFCs) offer a dual solution of generating electrical energy from organic pollutants-laden wastewater while treating it. This study focuses on enhancing MFC performance through innovative electrode design. Three-dimensional (3D) anodes, created from corncobs and mango seeds via controlled graphitization, achieved remarkable power densities. The newly developed electrode configurations were evaluated within sewage wastewater-driven MFCs without the introduction of external microorganisms or prior treatment of the wastewater. At 1,000°C and 1,100°C graphitization temperatures, corncob and mango seed anodes produced 1,963 and 2,171 mW/m2, respectively, nearly 20 times higher than conventional carbon cloth and paper anodes. An advanced cathode composed of an activated carbon-carbon nanotube composite was introduced, rivaling expensive platinum-based cathodes. By optimizing the thermal treatment temperature and carbon nanotube content of the proposed cathode, comparable or superior performance to standard Pt/C commercial cathodes was achieved. Specifically, MFCs assembled with corncob anode with the proposed and standard Pt/C cathodes reached power densities of 1,963.1 and 2,178.6 mW/m2, respectively. Similarly, when utilizing graphitized mango seeds at 1,100°C, power densities of 2,171 and 2,151 mW/m2 were achieved for the new and standard cathodes, respectively. Furthermore, in continuous operation with a flow rate of 2 L/h, impressive chemical oxygen demand (COD) removal rates of 77% and 85% were achieved with corncob and mango seed anodes, respectively. This work highlights the significance of electrode design for enhancing MFC efficiency in electricity generation and wastewater treatment