Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Discipline
Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 39601 - 39630 of 1195153

Full-Text Articles in Entire DC Network

Finite Element Convergence Analysis Of A Schwarz Alternating Method For Nonlinear Elliptic Pdes, Messaoud Boulbrachene Apr 2025

Finite Element Convergence Analysis Of A Schwarz Alternating Method For Nonlinear Elliptic Pdes, Messaoud Boulbrachene

Sultan Qaboos University Journal For Science

In this paper, we prove uniform convergence of the standard finite element method for a Schwarz alternating procedure for nonlinear elliptic partial differential equations in the context of linear subdomain problems and nonmatching grids. The method stands on the combination of the convergence of linear Schwarz sequences with standard finite element L-error estimate for linear problems.

Go to article

Two Groups 2^3.〖Psl〗_2 (7) And 2^3:〖Psl〗_2 (7) Of Order 1344, Mehmet Koca, Ramazan Koc, Nazife O.Koca Apr 2025

Two Groups 2^3.〖Psl〗_2 (7) And 2^3:〖Psl〗_2 (7) Of Order 1344, Mehmet Koca, Ramazan Koc, Nazife O.Koca

Sultan Qaboos University Journal For Science

No abstract provided.

Go to article

Preliminary Assessment Of Utilization Of Al-Jaif Scoria (Nw Sana’A, Yemen) For Cement Production, Al-Akhaly Ibrahim A., Al-Anweh Ahmed M., El-Anbaawy Mohammed I. Apr 2025

Preliminary Assessment Of Utilization Of Al-Jaif Scoria (Nw Sana’A, Yemen) For Cement Production, Al-Akhaly Ibrahim A., Al-Anweh Ahmed M., El-Anbaawy Mohammed I.

Sultan Qaboos University Journal For Science

This paper presents the results of investigations on the potential industrial utilization of scoria, collected from Al-Jaif quarry, NW Sana'a, Yemen as a cement additive. Scoria was chosen as a cement additive material due to its availability and low cost from the Sana’a-Amran volcanic field in Yemen. The chemical composition of scoria was determined by X-ray fluorescence (XRF). The studied scoria is mainly composed of volcanic glass with a few zeolites (e.g. clinoptilolite) as revealed from petrographic investigation and X-ray diffraction (XRD). The scoria was added to the clinker in the range of 2, 4, 6, 8, 10 and 12% …

Go to article

A One-Dimensional Model Of Thermo-Electroelasticity In Extended Thermodynamics, Moustafa Saber Abou-Dina, Ahmed Ahmed F. Ghaleb Apr 2025

A One-Dimensional Model Of Thermo-Electroelasticity In Extended Thermodynamics, Moustafa Saber Abou-Dina, Ahmed Ahmed F. Ghaleb

Sultan Qaboos University Journal For Science

The subject of thermo-electroelasticity involves many complications due to the multiple ways in which the mechanical, thermal and electric fields can interact, some of these involving non-linearities. In extended thermodynamics, an additional difficulty arises due to the requirement of finiteness of the speed of propagation of the thermal disturbances. This implies, as may be observed in the extensive literature on the subject, a re-visiting of the basic postulates of thermodynamics, ultimately leading to the desired generalization. There are only a few nonlinear models dealing with this subject. In order to consider general nonlinear models, it is necessary to study linear …

Go to article

Study On The Reactivity Of Amino Acid Chemosensor, Npfnp, With Ethanol: Structural Elucidation Through Single Crystal Xrd And Dft Calculations, Beena Varghese, Saleh N. Al-Busafi, Fakhr Eldin O. Suliman, Salma Al-Kindy Apr 2025

Study On The Reactivity Of Amino Acid Chemosensor, Npfnp, With Ethanol: Structural Elucidation Through Single Crystal Xrd And Dft Calculations, Beena Varghese, Saleh N. Al-Busafi, Fakhr Eldin O. Suliman, Salma Al-Kindy

Sultan Qaboos University Journal For Science

A novel ethoxy derivative of an amino acid chemosensor, 3-naphthyl-1-phenyl-5-(2ʹ-fluoro-5ʹ-nitrophenyl)-2-pyrazoline (NPFNP), has been synthesized and characterized by different spectroscopic methods. A single crystal of the ethoxy derivative, 3-naphthyl-1-phenyl-5-(2ʹ-ethoxy-5ʹ-nitrophenyl)-2-pyrazoline NPENP, has been obtained and characterized. The structure holds interest as it carries biologically active pyrazoline as a central ring attaching to electron donating and withdrawing substituents. The major motivation for this work was to gain detailed insight into the structural parameters of this compound for investigating the influence of crystal packing and geometrical dimensions on optical properties. Time-dependent DFT calculations have been employed for comparing the XRD data with theoretical parameters. …

Go to article

Review Of The Sayh Al Uhaymir (Sau) 005, Plus Pairings, Martian Meteorite From Al Wusta, Oman, Arshad Ali, Sobhi Nasir, Iffat Jabeen, Ahmed Al-Rawas Apr 2025

Review Of The Sayh Al Uhaymir (Sau) 005, Plus Pairings, Martian Meteorite From Al Wusta, Oman, Arshad Ali, Sobhi Nasir, Iffat Jabeen, Ahmed Al-Rawas

Sultan Qaboos University Journal For Science

Al Wusta is a desert area in the Sultanate of Oman which is famous due to the discovery of a number of Martian and Lunar meteorites since the start of the present millennium. According to the Meteoritical Bulletin database, 137 approved Martian meteorites have been found worldwide, including 17 from Oman (4 from Zufar, 13 from Al Wusta region). Interestingly 11 finds in the last 15 years have been of Sayh al Uhaymir (SaU) 005 and its pairings. These finds (estimated mass = 11.2 kg) are linked to 10 search expeditions carried out between November 26, 1999 and March 2, …

Go to article

An Improved Mnemonic Device For Thermodynamic Relations, Younghun Kim, Rengaraj Selvaraj Apr 2025

An Improved Mnemonic Device For Thermodynamic Relations, Younghun Kim, Rengaraj Selvaraj

Sultan Qaboos University Journal For Science

An improved mnemonic device for thermodynamic relations between state variables and potentials was proposed in the form of a thermodynamic circle. Based on separating the Born square into an inner square (T, P, V, and S) and an outer circle (G, A, U, and H), relations such as Legendre transforms, Maxwell equations, equations to compute variables, and differential equations for thermodynamic variables can be recalled easily. The thermodynamic circle has a cross-arrow at its center and can be used to intuitively determine the sign of all thermodynamic relations.

Go to article

Combined Effects Of Hall Current And Heat Transfer On Peristaltic Transport Of A Nanofluid In A Vertical Tapered Channel Through A Porous Medium, Ahmed I. Abdellateef, Syed Z. Ul Haque Apr 2025

Combined Effects Of Hall Current And Heat Transfer On Peristaltic Transport Of A Nanofluid In A Vertical Tapered Channel Through A Porous Medium, Ahmed I. Abdellateef, Syed Z. Ul Haque

Sultan Qaboos University Journal For Science

The influences of Hall currents and heat transfer on peristaltic transport of a nanofluid in a vertical porous tapered channel through a porous medium are investigated theoretically and graphically under the assumptions of low Reynolds number and long wavelength and the flow investigated is in a wavy frame of reference. Analytical solutions are obtained for temperature, axial velocity, stream function and pressure gradient. Graphical results are sketched for various embedded parameters.

Go to article

4d Pyritohedral Symmetry, Nazife O. Koca, Amal J.H. Al Qanobi, Mehmet Koca Apr 2025

4d Pyritohedral Symmetry, Nazife O. Koca, Amal J.H. Al Qanobi, Mehmet Koca

Sultan Qaboos University Journal For Science

We describe an extension of the pyritohedral symmetry in 3D to 4-dimensional Euclidean space and construct the group elements of the 4D pyritohedral group of order 576 in terms of quaternions. It turns out that it is a maximal subgroup of both the rank-4 Coxeter groups W (F4) and W (H4), implying that it is a group relevant to the crystallographic as well as quasicrystallographic structures in 4-dimensions. We derive the vertices of the 24 pseudoicosahedra, 24 tetrahedra and the 96 triangular pyramids forming the facets of the pseudo snub 24-cell. It turns out that the relevant lattice is the …

Go to article

Effects Of Second-Order Slip And Viscous Dissipation On The Analysis Of The Boundary Layer Flow And Heat Transfer Characteristics Of A Casson Fluid, Mohammad M. Rahman, Ioan Pop Apr 2025

Effects Of Second-Order Slip And Viscous Dissipation On The Analysis Of The Boundary Layer Flow And Heat Transfer Characteristics Of A Casson Fluid, Mohammad M. Rahman, Ioan Pop

Sultan Qaboos University Journal For Science

The aim of the present study is to analyze numerically the steady boundary layer flow and heat transfer characteristics of Casson fluid with variable temperature and viscous dissipation past a permeable shrinking sheet with second order slip velocity. Using appropriate similarity transformations, the basic nonlinear partial differential equations have been transformed into ordinary differential equations. These equations have been solved numerically for different values of the governing parameters namely: shrinking parametersuction parameterCasson parameterfirst order slip parametersecond order slip parameter Prandtl number and the Eckert number using the bvp4c function from MATLAB. A stability analysis has also been performed. Numerical results …

Go to article

Geological Assessment Of The Khor Kharfot Sediments, Western Dhofar Region, Sultanate Of Oman, Iftikhar A. Abbasi Apr 2025

Geological Assessment Of The Khor Kharfot Sediments, Western Dhofar Region, Sultanate Of Oman, Iftikhar A. Abbasi

Sultan Qaboos University Journal For Science

Khor Kharfot is part of a coastal estuarine wetland system located in the western part of the Dhofar Governorate preserving a pristine ecosystem supporting a distinct vegetation and animal habitat. A sand barrier along the khor (local term for wetlands) mouth controls the mixing of fresh and marine water in the enclosed lagoon. In order to understand the geological controls on the khor formation, a geological map of the khor barrier and inlet area is prepared. The khor is bounded by Cretaceous and Tertiary carbonate rock sequences which are cut by a number of faults. The khor mouth and barrier …

Go to article

Thermal And Transport Properties Of Mafic And Ultramafic Rocks Of Oman Ophiolite, Sayyadul Arafin, Ram N. Singh Apr 2025

Thermal And Transport Properties Of Mafic And Ultramafic Rocks Of Oman Ophiolite, Sayyadul Arafin, Ram N. Singh

Sultan Qaboos University Journal For Science

Thermal and other physical properties of rocks and minerals are of considerable significance for deriving mineralogical and compositional models of the Earth's mantle. We have determined these properties for the mafic rock such as gabbro and ultramafic rock like harzburgite of the Oman ophiolite suite by utilizing the Debye characteristic property ,Θ-

Go to article

Energy Management Through Heat Integration: A Simple Algorithmic Approach For Introducing Pinch Analysis, Nasser A. Al-Azri Apr 2025

Energy Management Through Heat Integration: A Simple Algorithmic Approach For Introducing Pinch Analysis, Nasser A. Al-Azri

Sultan Qaboos University Journal For Science

Pinch analysis is a methodology used for minimizing energy and material consumption in engineering processes. It features the identification of the pinch point and minimum external resources. Two common established approaches are used to identify these features: the graphical approach and the algebraic method, which are time-consuming and susceptible to human and calculation errors when used for a large number of process streams. This paper presents an algorithmic procedure to heat integration based on the algebraic approach. The algorithmic procedure is explained in a didactical manner to introduce pinch analysis for students and novice researchers in the field. Matlab code …

Go to article

A Note On Using Partitioning Techniques For Solving Unconstrained Optimization Problems On Parallel Systems, Mehiddin Al-Baali, Chefi Triki Apr 2025

A Note On Using Partitioning Techniques For Solving Unconstrained Optimization Problems On Parallel Systems, Mehiddin Al-Baali, Chefi Triki

Sultan Qaboos University Journal For Science

We deal with the design of parallel algorithms by using variable partitioning techniques to solve nonlinear optimization problems. We propose an iterative solution method that is very efficient for separable functions, our scope being to discuss its performance for general functions. Experimental results on an illustrative example have suggested some useful modifications that, even though they improve the efficiency of our parallel method, leave some questions open for further investigation.

Go to article

Numerical Solution To A One-Dimensional, Nonlinear Problem Of Thermoelasticity With Volume Force And Heat Supply In A Slab, Wael M. Mohamed, Ahmed F. Ghaleb, Enaam K. Rawy, Hassan A.Z. Hassan, Adel A. Mosharafa Apr 2025

Numerical Solution To A One-Dimensional, Nonlinear Problem Of Thermoelasticity With Volume Force And Heat Supply In A Slab, Wael M. Mohamed, Ahmed F. Ghaleb, Enaam K. Rawy, Hassan A.Z. Hassan, Adel A. Mosharafa

Sultan Qaboos University Journal For Science

A numerical solution is presented for a one-dimensional, nonlinear boundary-value problem of thermoelasticity with variable volume force and heat supply in a slab. One surface of the body is subjected to a given periodic displacement and Robin thermal condition, while the other is kept fixed and at zero temperature. Other conditions may be equally treated as well. The volume force and bulk heating simulate the effect of a beam of hot particles infiltrating the medium. The present study is a continuation of previous work by the same authors for the half-space [1]. The presented Figures display the process of propagation …

Go to article

Antibacterial And Antifungal Activities Of Cyanobacterial Strains Isolated From Hot Springs In Oman, Neelam Sherwani1, Raeid M.M. Abed, Sergey Dobretsov, Sheji Mary Apr 2025

Antibacterial And Antifungal Activities Of Cyanobacterial Strains Isolated From Hot Springs In Oman, Neelam Sherwani1, Raeid M.M. Abed, Sergey Dobretsov, Sheji Mary

Sultan Qaboos University Journal For Science

In this study, cyanobacterial microbial mats from five hot springs in Oman, namely Al Kasfah Rustaq, Al Thwara Nakhl, Al–Ali Hammam, Gala and Bowsher, were characterized using direct microscopy. Nine monoclonal cyanobacterial cultures were obtained and their extracts in butanol, dichloromethane (DCM) and hexane were screened for antibacterial and antifungal activities. Direct microscopy revealed the presence of 12 different unicellular and filamentous morphotypes, with different distribution in the various mats. Temperature seems to be one of the most important parameters that accounts for the differences in cyanobacterial composition of the mats. Cells of the nine isolates and their aqueous supernatants …

Go to article

Determinants Of Contraceptive Practice In Oman By Using Multilevel Modeling, Moza S. Al-Balushi, Mohammed S. Ahmed, M. Mazharul Islam Apr 2025

Determinants Of Contraceptive Practice In Oman By Using Multilevel Modeling, Moza S. Al-Balushi, Mohammed S. Ahmed, M. Mazharul Islam

Sultan Qaboos University Journal For Science

In this paper, multilevel logistic regression models are developed for examining the hierarchical effects of contraceptive use and its selected determinants in Oman using the 2008 Oman National Reproductive Health Survey (ONRHS). Comparison between single level and multilevel logistic regression models has been made to examine the plausibility of multilevel effects of contraceptive use. From the multilevel logistic regression model analysis, it was found that there is real multilevel variation among contraceptive users in Oman. The results indicate that a multilevel logistic regression model is the best fit over ordinary multiple logistic regression models. Generally, this study revealed that women’s …

Go to article

Projection Of Polyhedra Onto Coxeter Planes Described With Quaternions, Mudhahir Al-Ajmi, Mehmet Koca, Hashima Bait Bu Salasel Apr 2025

Projection Of Polyhedra Onto Coxeter Planes Described With Quaternions, Mudhahir Al-Ajmi, Mehmet Koca, Hashima Bait Bu Salasel

Sultan Qaboos University Journal For Science

3-dimensional convex uniform polyhedra have been projected onto their corresponding Coxeter planes defined by the simple roots of the Coxeter diagram ,

Go to article

Ferrocenylethynyl - A Versatile Platform For New Molecules To Novel Materials, Hakikulla H. Shah, Rayya A. Al-Belushi, Muhammad S. Khan Apr 2025

Ferrocenylethynyl - A Versatile Platform For New Molecules To Novel Materials, Hakikulla H. Shah, Rayya A. Al-Belushi, Muhammad S. Khan

Sultan Qaboos University Journal For Science

Ferrocenylethynyl is a key starting material for the synthesis of fascinating new molecules and novel functional materials. It combines the robust and redox-active ferrocene moiety with the rigid-rod ethynyl unit. The ferrocene center provides chemically and electrochemically switchable material properties whereas the ethynyl backbone facilitates electron delocalization along the molecule, yielding materials with the potential for a wide range of applications from sensors to bio-organometallics and pharmaceuticals, from catalysts to nonlinear optical materials, and from fuel additives to chelating agents. However, lifetime performances and costs still need to be optimized to make ferrocenylethynyl-based materials commercially competitive. Efficient synthetic methods are …

Go to article

Late Cretaceous Sub-Marine Fan System In Batain Mélange Zone, The Fayah Formation In Northeastern Oman, Iftikhar Ahmed Abbasi, Abdulrahman Al-Harthy, Yahya Khalifa Al-Subhi Apr 2025

Late Cretaceous Sub-Marine Fan System In Batain Mélange Zone, The Fayah Formation In Northeastern Oman, Iftikhar Ahmed Abbasi, Abdulrahman Al-Harthy, Yahya Khalifa Al-Subhi

Sultan Qaboos University Journal For Science

The Batain coast along the northeastern margin of Oman between Ra’s Al-Hadd and Ra’s Jibsch, is comprised of Permian to Late Cretaceous complex stratigraphy in a tectonically deformed area recording Permian rifting to late Cretaceous Tethys closure events. These rocks are thrust over Mesozoic and older autochthonous sedimentary cover in the form of a major nappe structure known as the Batain Nappe. The uppermost part of the Batain nappe is comprised of isolated outcrops of early Maastrichtian siliciclastic Fayah Formation dominated by gravity flow deposits. The Fayah Formation in the Jabal Fayah area is over four hundred meters thick and …

Go to article

Velocity Profiles For Flow Of Omani Crude Oils And Other Liquids, Sayyadul Arafin, S. M. Mujibur Rahman Apr 2025

Velocity Profiles For Flow Of Omani Crude Oils And Other Liquids, Sayyadul Arafin, S. M. Mujibur Rahman

Sultan Qaboos University Journal For Science

Velocity profiles of Newtonian immiscible liquids undergoing laminar flow between two horizontal plates under pressure gradient are investigated using a momentum balance equation. The differential equation describing the flow has been solved and equations for the velocity profiles of a two-layer and three-layer liquid systems are presented. As examples, we show flow patterns of two-layer water-crude oil system and three-layer system involving water, tetrachloromethane, xylene, cyclopentane and hexane. A distinctive pattern is noticeable between the velocity profiles of heavy (API 19.19) and light (API 40.89) Omani crude oils.

Go to article

Fcc, Bcc And Sc Lattices Derived From The Coxeter-Weyl Groups And Quaternions, Nazife Özdeş Koca, Mehmet Koca, Muna Al-Sawafi Apr 2025

Fcc, Bcc And Sc Lattices Derived From The Coxeter-Weyl Groups And Quaternions, Nazife Özdeş Koca, Mehmet Koca, Muna Al-Sawafi

Sultan Qaboos University Journal For Science

We construct the fcc (face centered cubic), bcc (body centered cubic) and sc (simple cubic) lattices as the root and the weight lattices of the affine extended Coxeter groups W(A3) and W(B3)=Aut(A3). It is naturally expected that these rank-3 Coxeter-Weyl groups define the point tetrahedral symmetry and the octahedral symmetry of the cubic lattices which have extensive applications in material science. The imaginary quaternionic units are used to represent the root systems of the rank-3 Coxeter-Dynkin diagrams which correspond to the generating vectors of the lattices of interest. The group elements are written explicitly in terms of pairs of quaternions …

Go to article

An Annotated Checklist Of The Mammals Of Kuwait, Peter J. Cowan Apr 2025

An Annotated Checklist Of The Mammals Of Kuwait, Peter J. Cowan

Sultan Qaboos University Journal For Science

An annotated checklist of the mammals of Kuwait is presented, based on the literature, personal communications, a Kuwait website and a blog and the author’s observations. Twenty five species occur, a further four are uncommon or rare visitors, six used to occur whilst another two are of doubtful provenance. This list should assist those planning desert rehabilitation, animal reintroduction and protected area projects in Kuwait.

Go to article

Synthesis Of Highly Ordered Crystalline Wurtzite (Zno) Membrane For Selenium-Chromium Separation, Sh. Labib, N.A. Tadros Apr 2025

Synthesis Of Highly Ordered Crystalline Wurtzite (Zno) Membrane For Selenium-Chromium Separation, Sh. Labib, N.A. Tadros

Sultan Qaboos University Journal For Science

Pure ZnO and composite ZnO-CeO2 coated thin films on titania substrates were prepared using a chelating sol-gel method under controlled conditions to be used in the separation and/or rejection of Se(IV) and Cr(VI). XRD and SEM studies confirmed the formation of highly ordered arrays of crystalline wurtzite microstructure with mixed orientation. An increase in average particle size of the prepared membranes from 1.25 to 3 µm with increasing CeO2 percent was observed indicating the vital role of CeO2 as secondary phase in improving the crystallinity of the coated films formed. Detailed study of the separation performance of the selected membranes …

Go to article

Chiral Polyhedra Derived From Coxeter Diagrams And Quaternions, Mehmet Koca, Nazife Ozdes Koca, Muna Al-Shueili Apr 2025

Chiral Polyhedra Derived From Coxeter Diagrams And Quaternions, Mehmet Koca, Nazife Ozdes Koca, Muna Al-Shueili

Sultan Qaboos University Journal For Science

There are two chiral Archimedean polyhedra, the snub cube and snub dodecahedron together with their dual Catalan solids, pentagonal icositetrahedron and pentagonal hexacontahedron. In this paper we construct the chiral polyhedra and their dual solids in a systematic way. We use the proper rotational subgroups of the Coxeter groups and to derive the orbits representing the solids of interest. They lead to the polyhedra tetrahedron, icosahedron, snub cube, and snub dodecahedron respectively. We prove that the tetrahedron and icosahedron can be transformed to their mirror images by the proper rotational octahedral group so they are not classified in the class …

Go to article

An Approach To Analyze The Ambiguity In Rna Structure, Shailendra Singh, Amardeep Singh Apr 2025

An Approach To Analyze The Ambiguity In Rna Structure, Shailendra Singh, Amardeep Singh

Sultan Qaboos University Journal For Science

DNA and RNA are two very important bio-molecules of the human cell. RNA is the second major form of nucleic acid in human cells that plays an intermediary role between DNA and functional protein. Several classes of RNA’s are found in cells, each with a / its distinct function. Understanding of storage and utilization of a cell’s genetic information is based on the structure of RNA. However, Many many experimental results have shown that RNA plays a another greater role in the cells. RNA sequences contains which contain signals at the structure level can be exploited to detect functional motifs …

Go to article

Lithofacies Attributes Of A Transgressive Carbonate System : The Middle Eocence Seeb Formation, Al Khoud Area, Muscat, Oman, Osman Salad Hersi, Abdulrahman Al-Harthy Apr 2025

Lithofacies Attributes Of A Transgressive Carbonate System : The Middle Eocence Seeb Formation, Al Khoud Area, Muscat, Oman, Osman Salad Hersi, Abdulrahman Al-Harthy

Sultan Qaboos University Journal For Science

The Seeb Formation (Middle Eocene) is an about 600 m thick transgressive carbonate succession deposited in the Batina and Muscat coastal region of Oman. The formation consists of five informal, but distinct units, and their stacking architecture suggests a deepening-upward, shallow marine depositional setting. Unit I is characterized by cross-bedded, sandy, bioclastic packstones to grainstones deposited in a high energy beach-to-intertidal environment. Unit II consists of indistinctly bedded, nodular, bioclastic (mainly larger foraminifera) packstones and wackestones deposited in a logoonal lagoonal environment. Unit III is defined by medium to thickly bedded, bioclastic packestones to grainstones and subordinate, laterally confined conglomerates. …

Go to article

An Electrophoretic Study Of Ldh-Isozyme Distribution In Developing Embryonic And Adult Tissues Of The Toad Bufo Arabicus, Intisar Ambusaidi, Taher Ba-Omar, Saif Al-Bahri, Aisha Al-Shihi Apr 2025

An Electrophoretic Study Of Ldh-Isozyme Distribution In Developing Embryonic And Adult Tissues Of The Toad Bufo Arabicus, Intisar Ambusaidi, Taher Ba-Omar, Saif Al-Bahri, Aisha Al-Shihi

Sultan Qaboos University Journal For Science

Lactate (LDH) dehydrogenases were studied by electrophoresis to investigate the possibility of isozymic differences in different stages and organs of B. arabicus embryos, tadpoles and adults. The expression pattern of lactate dehydrogenase (LDH) isozymes was analysed using nondenaturing discontinuous polyacrylamide gel electrophoresis (PAGE). Five LDH isozymes were observed in five different adult tissues. The most cathodal isozyme LDH-5 (A4) showed the strongest activity. All embryonic stages tested displayed the anodic isozymes first. Four LDH isozymes were present in the stages 1-16 (fertilized egg-tail bud stage). The first appearance of the fifth isozyme was detected in stage 17 when the muscular …

Go to article

Pcr Based Detection Of Genetically Modified Soy In Processed Foods Commercially Available In Saudi Arabia, Ibrahim Abdullah Alaraidh Apr 2025

Pcr Based Detection Of Genetically Modified Soy In Processed Foods Commercially Available In Saudi Arabia, Ibrahim Abdullah Alaraidh

Sultan Qaboos University Journal For Science

In this research, PCR (polymerase chain reaction) technique was applied to detect the presence of GMO sold in the Saudi Arabian market. This method was applied to detect genetically modified soy (GM-soy) in particular the roundup ready soy (RRS). To confirm the presence of soy, samples were first tested for the existence of the soy specific lectin gene. A total of eighty samples were tested out of which two samples tested positive as GM-soy. Not surprisingly, the findings showed the existence of GM-soy in food products in Saudi. This supports the necessity of developing precise quantitative and qualitative ways for …

Go to article

Studies Of Surface Area And Pore Structure On Portland Cement Produced In Bajil And Amran, Yemen, A.M. Saad, Abdul-Basit A. Saleh, Fatima A. Al-Kadri, Abdulla S. Babaqi, Abdulla A. Basissa, S.A. Abo El-Enein Apr 2025

Studies Of Surface Area And Pore Structure On Portland Cement Produced In Bajil And Amran, Yemen, A.M. Saad, Abdul-Basit A. Saleh, Fatima A. Al-Kadri, Abdulla S. Babaqi, Abdulla A. Basissa, S.A. Abo El-Enein

Sultan Qaboos University Journal For Science

Portland cement pastes of various porosities were prepared using water/cement ratios of 0.30, 0.35, 0.40, 0.45, 0.50 and 0.55; and were hydrated for various time intervals ranging from 0.021 to 28 days. Pore structure and VL–t plots (plots of volume vs. thickness) of the hardened cement pastes were measured using nitrogen gas as the adsorbate. The results were found to be related to the mechanism of hydration as controlled by the pore system of the hardened pastes. Type ІІ adsorption isotherms of nitrogen were obtained for all hardened cement pastes. The adsorption-desorption isotherms indicated the existence of closed hysteresis loops …

Go to article

First Prev Next Last