Minia UniversityJournal of Modern Research2636-39092120200101Hydrolytic enzyme production of endophytic fungi isolated from soybean (Glycine max)174811810.21608/jmr.2019.15748.1008ENHala MontaserFaroukDepartment of Botany and Microbiology, Faculty of Science, Minia University, 61519 Minia, EgyptEman ZekryAttiaDepartment of Pharmacognosy, Faculty of Pharmacy, Minia University, 61519 Minia, EgyptMo'men H.El-KatatnyDepartment of Botany and Microbiology, Faculty of Science, Minia University, 61519 Minia, EgyptJournal Article20190806This current approach aimed to isolate endophytic fungi from soybean (Glycine max L.) and to assess for their ability to produce hydrolytic extracellular enzymes such as carboxymethyl cellulase (CMC-ase), xylanase and amylase in order to evaluate their ecological role within the host plant. Ten endophytic fungi were isolated from soybean (roots, stems, and leaves). All isolated endophytes (100%) exhibited CMC-ase, xylanase and amylase activities using the minimal synthetic medium (MSM) for enzyme production supplemented with 2% agar in presence of the appropriate carbon source including carboxymethyl cellulose (CMC) for CMC-ase, xylan for xylanase and starch for amylase). The endophytic isolates showed growth stimulation on CMC and xylan media and were hyperactive in the presence of these substrates more than glucose. On the other hand, starch was investigated as the lower preferable substrate for these endophytes. These relevant results endeavored to explore endophytic fungi and to investigate their production of industrial microbial enzymes.https://jmr.journals.ekb.eg/article_48118_f875272ca22c7213c648af2f7a26b149.pdfMinia UniversityJournal of Modern Research2636-39092120200101On Generalized Linear Exponential Distribution: Different Methods of Estimation8135246210.21608/jmr.2019.15428.1007ENM. A. W.MahmoudDepartment of Mathematics, Faculty of Science, Al-Azhar University, 11884 Nasr city, Cairo, Egypt0000-0001-5156-7128M. G. M.GhazalDepartment of Mathematics, Faculty of Science, Minia University, 61519 Minia, EgyptH. M. M.RadwanDepartment of Mathematics, Faculty of Science, Minia University, 61519 Minia, Egypt0000-0003-2936-9672Journal Article20190729This paper concerns with various techniques for estimations from the generalized linear exponential distribution (GLED) that can be used for modeling bathtub, increasing and decreasing hazard rate (HR) behavior and was first proposed by [3]. This distribution is important since it contains as special sub-models some widely well-known distributions such as the exponential distribution (ED), the Rayleigh distribution (RD), the linear exponential distribution (LED), and the Weibull distribution (WD). The various techniques for estimations can be considered as maximum likelihood estimation (MLE), least-square estimation (LSE), weighted least square estimation (WLSE), Cramér Von-Mises estimation (CVME), and Anderson Darling estimation (ADE). These methods of estimations are used to estimate the unknown parameters of the well-known GLED. Two applications are used to show that the GLED is a viable distribution in modeling lifetime data and to compare the varying methods of estimations based on the Kolmogorov-Simnorov test with the corresponding P-value to show the optimal method. Finally, a simulation study is presented to compare the varying methods of estimation based on the mean square error (MSE) and the average absolute bias (AAB).https://jmr.journals.ekb.eg/article_52462_11dc2883c70691a5d69c55ac8eafa419.pdfMinia UniversityJournal of Modern Research2636-39092120200101INFLUENCE OF FILLING MEDIUM DENSITY POLYETHYLENE WITH VEGETABLE OILS ON FRICTION AND WEAR14255479010.21608/jmr.2019.14889.1004ENK. H.MahmoudDepartment of Mechanical, Al-Ameeria Integrated Technical Education Cluster, Cairo, Egypt0000-0002-3631-324XM. I.KhashabaDepartment of Production Engineering and Mechanical design, Faculty of Engineering, Minia University, 61519 Minia, EgyptJournal Article20190721This study aims to fill medium density polyethylene MDPE by four different types of oils and study the influence on wear and friction properties. The four oils are Chamomile oil, Mustard oil, Soy oil, and Almond oil. MDPE was filled with four different weight contents of each oil: 5, 10, 15, and 20 wt. %. The composites were tested using pin-on-disc instrument. Five loads were applied during test, 12 N, 14 N, 16 N, 18 N, and 20 N. The general trend of results showed improvement of wear resistance. Almond oil achieved the best result of resisting wear. 15 wt. % of Almond oil content achieved the lowest value of wear. 20 wt. % of almond oil content achieved the lowest wear value at the highest load. The friction tended to increase with increasing the oil weight content of chamomile oil, soy oil, and almond. For mustard oil, the friction decreased. The results showed that blending oils with MDPE has a counter effect on hardness. SEM micrographs showed the changes in surface topography of MDPE due to filling oils with it.https://jmr.journals.ekb.eg/article_54790_cf8a11c164e99595f087a78f5c8d51ba.pdfMinia UniversityJournal of Modern Research2636-39092120200101Effect of Aging and Pre-sintering Surface Treatment of Zirconia Cores on Chipping of Veneered Zirconia Crowns26305727610.21608/jmr.2019.18412.1010ENHanaa FMahmoudDepartment of Biomaterials, Faculty of Dentistry, Minia University, 61519 Minia, Egypt0000-0003-3852-4080Yaser FGomaaDepartment of Biomaterials, Faculty of Dentistry, Minia University, 61519 Minia, EgyptA Nour A HabibDepartment of Biomaterials, Faculty of oral and dental medicine, Cairo University, 12345 Cairo, EgyptJournal Article20191019Abstract <br /> Aim: This study was conducted to study the effect of surface treatment of zirconia cores by nanosilica before sintering on veneers chipping and to evaluate the effect of aging in terms of thermocycling and cyclic loading on veneer chipping before and after surface treatment.<br /> Method: Model acrylic tooth was prepared for zirconia crown, twenty silicon impressions were recorded and epoxy resin dies were produced. Twenty zirconia cores were fabricated by CAD/ CAM system and divided into 2 groups (n=10) group I was the control which veneered with porcelain by hand layering technique while group II was subjected to treatment by nanosilica slurry before sintering then veneered and fired to produce crowns. The crowns were cemented by resin cement on their epoxy dies and they were subjected to 10000 thermocycles and 10000 cyclic loads. All crowns were loaded till chipping of veneer layer then the chipped surfaces were examined by SEM/EDX. <br /> Results: There was no significant difference in chipping resistance between group I and group II. <br /> Conclusions: Treatment of zirconia cores by nanosilica before sintering has no effect on chipping resistance of the veneer layer after subjecting to aging process (thermocycling and cyclic loading).https://jmr.journals.ekb.eg/article_57276_f82170cebfb97021bbd223c00841a6bc.pdfMinia UniversityJournal of Modern Research2636-39092120200101Assessment of fracture force of CAD-CAM-fabricated overlay restorations using deep marginal elevation technique.31346579210.21608/jmr.2019.17940.1009ENMohamed SalehMohamedDepartment of Fixed Prosthodontics, Faculty of Dentistry, Minia University, 61519 Minia, EgyptCherif AdelMohsenDepartment of Fixed Prosthodontics, Faculty of Dentistry, Minia University, 61519 Minia, EgyptShams WaazAmgadDepartment of Fixed Prosthodontics, Faculty of Dentistry, Minia University, 61519 Minia, EgyptJournal Article20191008ABSTRACT<br /> <br /> Purpose<br /> <br /> To evaluate the fracture force of CAD-CAM-fabricated overlay restorations (Feld spathic cerec <br /> <br /> <br /> blocks) and hybrid ceramic material (VITA Enamic) using deep marginal elevation technique <br /> <br /> <br /> (DME).<br /> <br /> <br /> Materials and methods<br /> <br /> <br /> Twenty overlay restorations were constructed in this study. The samples were divided into two <br /> <br /> <br /> main groups according to the ceramic material (n=10). The type of ceramics that was used is <br /> <br /> <br /> (feld spathic for group I and vita enamic for group II). a ceramic material which was used (10 <br /> <br /> <br /> samples each):- The first group : feld spathic cerec blocks cemented by RelyX Ultimate Clicker <br /> <br /> <br /> resin cement. The second group: VITA ENAMIC hybrid ceramic overlays cemented by RelyX <br /> <br /> <br /> Ultimate Clicker resin cement. Each main group was subdivided into two subgroups for each <br /> <br /> <br /> type of the ceramic material according to the fracture force (n=5), One of them without deep <br /> <br /> <br /> marginal elevation and the other with a deep marginal elevation (DME) till the cemento-enamel <br /> <br /> <br /> junction (CEJ).<br /> <br /> <br /> Results<br /> <br /> <br /> Between the two materials There was a significant difference between the feld spathic and vita <br /> <br /> <br /> enamic materials in with and without deep marginal elevation technique . <br /> <br /> <br /> Conclusion<br /> <br /> <br /> VITA Enamic material has higher fracture force than feld spathic material in samples with deep <br /> <br /> <br /> marginal elevation. Feld spathic material has higher fracture force than vita enamic material in <br /> <br /> <br /> samples without (DME).https://jmr.journals.ekb.eg/article_65792_514fc904e332ca6fe03263131c8e595a.pdf