93 research outputs found
EIS parameters obtained for HPDC, AS, and GS immersed in 0.5M H<sub>2</sub>SO<sub>4</sub> for 1 h.
No full textEIS parameters obtained for HPDC, AS, and GS immersed in 0.5M H2SO4 for 1 h.</p
SEM micrographs of Pb-5%Sb alloy produced (a) high pressure (HPDC) casting (b) low pressure (AS) casting and (c) very low pressure (GS) casting.
No full textSEM micrographs of Pb-5%Sb alloy produced (a) high pressure (HPDC) casting (b) low pressure (AS) casting and (c) very low pressure (GS) casting.</p
Comparative genomic analysis of human infective Trypanosoma cruzi lineages with the bat-restricted subspecies T. cruzi marinkellei.
No full textBACKGROUND: Trypanosoma cruzi marinkellei is a bat-associated parasite of the subgenus Schizotrypanum and it is regarded as a T. cruzi subspecies. Here we report a draft genome sequence of T. c. marinkellei and comparison with T. c. cruzi. Our aims were to identify unique sequences and genomic features, which may relate to their distinct niches. RESULTS: The T. c. marinkellei genome was found to be ~11% smaller than that of the human-derived parasite T. c. cruzi Sylvio X10. The genome size difference was attributed to copy number variation of coding and non-coding sequences. The sequence divergence in coding regions was ~7.5% between T. c. marinkellei and T. c. cruzi Sylvio X10. A unique acetyltransferase gene was identified in T. c. marinkellei, representing an example of a horizontal gene transfer from eukaryote to eukaryote. Six of eight examined gene families were expanded in T. c. cruzi Sylvio X10. The DGF gene family was expanded in T. c. marinkellei. T. c. cruzi Sylvio X10 contained ~1.5 fold more sequences related to VIPER and L1Tc elements. Experimental infections of mammalian cell lines indicated that T. c. marinkellei has the capacity to invade non-bat cells and undergo intracellular replication. CONCLUSIONS: Several unique sequences were identified in the comparison, including a potential subspecies-specific gene acquisition in T. c. marinkellei. The identified differences reflect the distinct evolutionary trajectories of these parasites and represent targets for functional investigation
Fracture Assessment of Axial Crack in Steel Pipe under Internal Pressure
No full textAbstractFracture assessment of axial crack in steel pipe subjected to internal pressure is reviewed. Assessment results were obtained using different methods FC, GS and FAD in order to compare between their results and facilitate their use in any maintenance program. Material type and crack geometry are considered as the main two parameters controlling the failure of the pipe. The constitutive equation of the material is represented by the Ramberg – Osgood model. Six different half crack lengths (40, 60, 80, 100, 120,and 140mm) and four values of the ratio between the crack depth and the pipe thickness are considered (0.2, 0.4, 0.6 and 0.8). The relationship between the fracture parameters (i.e., stress intensity factor K and the J-integral) and the crack length for each assessment method is used. The material properties, plane strain fracture toughness KIc as well as the critical value of J-integral Jcr, are used to determine the critical crack size under specified internal pressure. The assessment method that gives smaller critical crack size is the one which is more conservative than the others. The results obtained by using GS and FAD assessment methods show this type of conservation
Optical micrograph of Pb-5%Sb alloy produced (a) high pressure (hadi, HPDC) casting (b) low pressure (auto (AS)) casting and (c) very low pressure (gravity (GS)) casting.
No full textOptical micrograph of Pb-5%Sb alloy produced (a) high pressure (hadi, HPDC) casting (b) low pressure (auto (AS)) casting and (c) very low pressure (gravity (GS)) casting.</p
The Nexus between Green Perceived Quality, Green Satisfaction, Green Trust, and Customers’ Green Behavioral Intentions in Eco-Friendly Hotels: A Structural Equation Modeling Approach
No full textWith the growing awareness of the climate change effects, hotel customers progressively intend to favor green products and services that minimize adverse environmental effects. The key factors affecting customers’ green behavioral intentions in the hospitality industry context are still under research. Accordingly, this study primarily aims at empirically investigating the nexus between green perceived quality (GPQ), green satisfaction (GS), green trust (GT), and customers’ green behavioral intentions (CGBIs) in a sample of five-star eco-friendly hotels in Egypt. More specifically, the study first endeavors to investigate the direct impact of GPQ on GS, GT, and CGBIs besides exploring the direct impact of GS and GT on CGBIs in addition to examining the potential effect of GS and GT as mediators in the nexus between GPQ and CGBIs. To achieve the study’s aim and associated objectives, a self-administrated questionnaire was developed and distributed to a convenience sample of local guests staying at certified five-green star hotels. A total of 500 questionnaires were distributed, and only 304 valid forms, representing 60.8%, were used in the statistical analysis. Seven hypotheses, reflecting the direct and indirect relationships between study constructs, were examined by using Structural Equation Modeling (SEM) with bootstrapping technique. The study findings revealed that GS, GT as well as CGBIs are significantly positively affected by GPQ, respectively. Furthermore, GT and GS have a significant positive effect on CGBIs. Moreover, GT as well as GS partially mediate the nexus between GPQ and CGBIs. From the previous findings, it could be concluded that the increase in investment in enhancing GPQ significantly contributes to the improvement in GS, GT, and CGBIs. Additionally, the higher the GT, GPQ, and GS, the greater the revisit intention to green hotels, positive green word-of-mouth (GWoM), and intention to pay a premium for staying in environmentally friendly hotels. As a result, for enhancing CGBIs and sustaining a customer-hotel long-term relationship, hotel operators should make efforts towards maintaining GT, improving GPQ, and increasing customers’ GS as key predictors of CGBIs in the hotel industry context
Rootstock Priming with Shikimic Acid and Streptomyces griseus for Growth, Productivity, Physio-Biochemical, and Anatomical Characterisation of Tomato Grown under Cold Stress
No full textWith this research, we aimed to determine the impact of grafting and rootstock seed treated with Streptomyces griseus (MT210913) (S. griseus) or shikimic acid (SA) at a 60 ppm concentration on tomato (Solanum lycopersicum L.) production grown under low-temperature conditions. Two open-field trials were performed during both winter seasons of 2020 and 2021 at the Experimental Farm, Faculty of Agriculture, Cairo University, Giza, Egypt. A tomato cultivar (Peto 86) was used as a scion and two tomato phenotypes were employed as rootstocks (Solanum cheesmaniae L. (line LA 524) and GS hybrid), as well as self-grafted as a control. Effects of sub-optimal temperature on vegetative growth, yield, and fruit quality were tested. The results indicate that, under cold stress, rootstock seed priming, especially with S. griseus, enhanced plant growth, total yield, and fruit quality properties. GS hybrid rootstock was more effective than that of S. cheesmaniae rootstock in terms of mitigating the negative effect of cold stress. GS hybrid, inoculated with S. griseus, increased the total yield per plant by 10.5% and 5.7% in the first and second seasons, respectively. Higher levels of GA3 and mineral content were noticed in leaves that were grafted and treated with S. griseus compared to the control treatment. Additionally, the great enhancing effects of all anatomical features of tomato plants were recorded with GS hybrid rootstock, inoculated by S. griseus. These results prove that grafting on GS hybrid rootstock treated with S. griseus is a potential choice to alleviate the cold stress of commercial tomato varieties
A randomized single-blind trial of standard diet versus fiber-free diet with polyethylene glycol electrolyte solution for colonoscopy preparation
No full textBackground and study aims: Colonoscopy preparation usually involves the intake of large volumes of polyethylene glycol electrolyte solution (PEG-ES) in combination with a clear-liquid diet (CLD). Liberalization of the diet might enhance the tolerance to PEG-ES without compromising the quality of the preparation. The primary aims of this study were to evaluate the efficacy and tolerability of PEG-ES given with a CLD compared with a fiber-free diet (FFD) for colonoscopy preparation. The incidence of adverse events among patients in the two diet groups was also assessed as a secondary outcome. Methods: This was a single-center randomized, prospective, single-blind study. A total of 200 patients undergoing colonoscopy were randomized to either CLD or FFD in addition to PEG-ES. Results: Patients in the FFD group were able to drink more PEG-ES (mean ±SD, 3.9±0.3L) compared with those in the CLD group (3.3±0.7L) (P0.01). The quality of the preparation was significantly better in the FFD group, with more patients having satisfactory preparations than those in the CLD group (81.4percent vs. 52.0percent; P0.001). Tolerance to the preparation was higher in the FFD group compared with the CLD group, with significantly more patients adhering to the FFD regimen (P0.001). There were more adverse events experienced in the CLD group, with odds ratios of 1.9 for nausea (95percent confidence interval [CI] 1.03.6), 3.8 for vomiting (95percent CI 1.311.3), and 3.0 for headache (95percent CI 1.55.9). Conclusion: FFD given with PEG-ES on the day before colonoscopy is a more effective regimen than the standard CLD regimen, and is better tolerated by patients. © Georg Thieme Verlag KG Stuttgart New York.Ainley EJ, 2005, DIGEST DIS SCI, V50, P1319, DOI 10.1007-s10620-005-2780-9; Aoun E, 2005, GASTROINTEST ENDOSC, V62, P213, DOI 10.1016-S0016-5107(05)00371-8; Church JM, 1998, DIS COLON RECTUM, V41, P1223, DOI 10.1007-BF02258217; DAVIS GR, 1980, GASTROENTEROLOGY, V78, P991; Delegge M, 2005, ALIMENT PHARM THERAP, V21, P1491, DOI 10.1111-j.1365-2036.2005.02494.x; DiPalma JA, 2003, AM J GASTROENTEROL, V98, P2187, DOI 10.1016-S0002-9270(03)00696-8; El Sayed AMA, 2003, GASTROINTEST ENDOSC, V58, P36, DOI 10.1067-mge.2003.318; Froehlich F, 2005, GASTROINTEST ENDOSC, V61, P378, DOI 10.1016-S0016-5107(04)02776-2; GINZBERG L, 2007, TECH GASTROINTEST EN, V9, P205, DOI 10.1016-j.tgie.2007.08.002; HALE WE, 1986, J AM GERIATR SOC, V34, P333; Harewood GC, 2003, GASTROINTEST ENDOSC, V58, P76, DOI 10.1067-mge.2003.294; Hayes Ann, 2003, Gastroenterol Nurs, V26, P106, DOI 10.1097-00001610-200305000-00004; Hookey LC, 2004, AM J GASTROENTEROL, V99, P2217, DOI 10.1111-j.1572-0241.2004.40482.x; Hsu CW, 1998, GASTROINTEST ENDOSC, V48, P276, DOI 10.1016-S0016-5107(98)70191-9; Hwang KL, 2005, WORLD J GASTROENTERO, V11, P7486; Jayanthi V, 2000, Trop Gastroenterol, V21, P18; Katsinelos P, 2005, HEPATO-GASTROENTEROL, V52, P441; Rapier R, 2006, GASTROENTEROL NURS, V29, P305, DOI 10.1097-00001610-200607000-00007; Raymer GS, 2003, GASTROINTEST ENDOSC, V58, P30, DOI 10.1067-mge.2003.293; Rex DK, 2002, AM J GASTROENTEROL, V97, P1696; Scott Sherrie R, 2005, Gastroenterol Nurs, V28, P133, DOI 10.1097-00001610-200503000-00008; Sharma VK, 1998, GASTROINTEST ENDOSC, V47, P167, DOI 10.1016-S0016-5107(98)70351-7; Siddiqui AA, 2009, GASTROINTEST ENDOSC, V69, P700, DOI 10.1016-j.gie.2008.09.047; Taylor C, 2001, AM J GASTROENTEROL, V96, P710; Thomas-Gibson S, 2006, ENDOSCOPY, V38, P456, DOI 10.1055-s-2006-925259; Toledo TK, 2001, ALIMENT PHARM THERAP, V15, P605, DOI 10.1046-j.1365-2036.2001.00966.x; van Gorkom BAP, 1998, Z GASTROENTEROL, V36, P1319191
Novel Wastewater Treatment by Using Newly Prepared Green SeaweedZeolite Nanocomposite
No full textA dependent step-by-step
study that included experimental and field
study was applied to explore the simplest and most effective system
that could be applied for adsorption of Congo Red (CR) dye from the
effluent of wastewater that comes out from different industries. Zeolite
(Z) surface and pores were subjected to a modification process using
green seaweed (GS) algae. Thereafter, each Z, GS, and composite from
both were evaluated based on the adsorption efficacy to clean up CR
dyes from aqueous solutions. A wet impregnation method was followed
to fabricate the zeolite/algae (ZGS) nanocomposite which was characterized
using the most appropriate characterization techniques. Batch experiments
were selected to be the method of choice in order to follow up the
performance of the adsorption process versus different practical variables.
Moreover, dye adsorption kinetics and isotherms were investigated
as well. At lowered concentrations of CR, the novel nanocomposite
ZGS revealed more efficacy than its counterparts, Z and GS, in terms
of the adsorption capacity. The maximum adsorption capacities were
found to be 8.10, 10.30, and 19.70 mg/g for Z, GS, and ZGS, respectively.
Laboratory tests confirmed that the novel nanocomposite ZGS could
be introduced as a new and economical nanoadsorbent to capture and
remove negatively charged dyes from wastewater effluents that come
out from industries at lower concentrations of CR dye and analogous
compounds. The dye adsorption on GS, Z, and ZGS coincide with the
pseudo-first, Langmuir isotherm, and second-order models. Evaluation
for the sorption mechanism was conducted using a diffusion model known
as Weber’s intraparticle. Depending on the last findings, field
experiments on removing dyes from industrial wastewater revealed optimistic
findings as the efficiency of our modern and eco-friendly nanoadsorbent
reached 91.11%, which helps in the reuse of industrial wastewater
Microstructure characterization and corrosion resistance properties of Pb-Sb alloys for lead acid battery spine produced by different casting methods
No full textThe aim of this study is to find out the microstructure, hardness, and corrosion resistance of Pb-5%Sb spine alloy. The alloy has been produced by high pressure die casting (HPDC), medium pressure die casting (AS) and low pressure die casting (GS) methods, respectively. The microstructure was characterized by using optical microscopy and scanning electron microscopy (SEM). The hardness was also reported. The corrosion resistance of the spines in 0.5M H2SO4 solution has been analyzed by measuring the weight loss, impedance spectroscopy and the potentiodynamic polarization techniques. It has been found that the spine produced by HPDC has defect-free fine grain structure resulting improvement in hardness and excellent corrosion resistance.</div
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