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Global Dynamics And Sensitivity Analysis Of A Vector-Host-Reservoir Model, Ibrahim M. Elmojtaba, Santanu Biswas, Joydev Chattopadhyay Apr 2025

Global Dynamics And Sensitivity Analysis Of A Vector-Host-Reservoir Model, Ibrahim M. Elmojtaba, Santanu Biswas, Joydev Chattopadhyay

Sultan Qaboos University Journal For Science

The role of animal reservoir in the disease dynamics is not yet properly studied. In the present investigation a mathematical model of a vector-host-reservoir is proposed and analyzed to observe the global dynamics of the disease. We observe that the disease free equilibrium is globally asymptotically stable if the basic reproduction number ( ) is less than unity whereas unique positive equilibrium is globally asymptotically stable if and transcritical bifurcation occurs at . Our numerical result suggests that the biting rate plays an important role for the propagation of the disease and the recovery rate has not such important contribution …

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Detection Of Unlabeled Genetically Modified Soybean In The Omani Market, Nabila Al-Sadqi, Aliya S. Alansari Apr 2025

Detection Of Unlabeled Genetically Modified Soybean In The Omani Market, Nabila Al-Sadqi, Aliya S. Alansari

Sultan Qaboos University Journal For Science

This study aimed to screen for products containing Genetically Modified (GM) food in the Omani market using detection methods for the presence of Roundup Ready Soybean, Bt176 and MON810 maize in food products and to quantify it in positive samples using real time Polymerase Chain Reaction (PCR). A total of 100 food samples were collected randomly from markets in Oman. Out of 59 samples, 8 (13.5%) were successfully amplified with the maize plant specific PCR. GM screening showed negative for all samples, which indicated low or no GM maize in the samples tested. Out of 57 soy containing samples, 40 …

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Rolling Optimization Method For Humanoid Robots, Riadh Zaier Apr 2025

Rolling Optimization Method For Humanoid Robots, Riadh Zaier

Sultan Qaboos University Journal For Science

In this paper, a method of optimizing the rolling amplitude needed for a stable and smooth walking movement of a humanoid robot is considered. The optimization algorithm was based on minimizing a cost function defined by the rolling overshoot. The amplitude of the rolling during locomotion was calculated using the lateral zero moment point (ZMP) position. The initial value of the rolling was the static rolling that corresponds to the position of the ZMP at the center of the support polygon. The algorithm consisted of performing a ZMP calculation at two points that correspond to single support phases. Simplifying the …

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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 …

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Histopathological And Ultrastructural Changes In The Liver And Gills Of The Killifish Aphanius Dispar (Cyprinodontidae) Exposed To Aflatoxin B1, Horiya H. Al-Azri, Taher Ba-Omar, Abdulkadir Elshafie, Michael J. Barry Apr 2025

Histopathological And Ultrastructural Changes In The Liver And Gills Of The Killifish Aphanius Dispar (Cyprinodontidae) Exposed To Aflatoxin B1, Horiya H. Al-Azri, Taher Ba-Omar, Abdulkadir Elshafie, Michael J. Barry

Sultan Qaboos University Journal For Science

Aflatoxin B1 (AFB1) is a mycotoxin which can cause serious toxicity to animals and humans. The aim of this study was to investigate the effects of AFB1 in Aphanius dispar fish and measure residues in tissues after in vivo exposure. Aphanius dispar were fed diets containing 50, 100, 150 and 200 µg AFB1/kg for 10, 20 and 30 days. At the end of the experiment, the liver and gills were dissected out and processed for light and electron microscopy. During the experiment, no external changes or unusual behavior were observed in the fish. Histopathological and ultrastructural changes in liver appeared …

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Synthesis And Characterization Of Some Macrocylic Complexes Incorporating Indole And 2,2'-Bipyridine Or 1,10-Phenanthroline, Muhammad S. Khan, Nawal K. Al-Rasbi, Edwin C. Constable Apr 2025

Synthesis And Characterization Of Some Macrocylic Complexes Incorporating Indole And 2,2'-Bipyridine Or 1,10-Phenanthroline, Muhammad S. Khan, Nawal K. Al-Rasbi, Edwin C. Constable

Sultan Qaboos University Journal For Science

Complexes of anionic pentadentate macrocyclic ligands by the template condensation of bis(hydrazino)2,2'-bipyridine or 1,10-phenanthroline with an indoledialdehyde have been synthesized. The new Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II) macrocyclic complexes have been characterized by analytical and spectroscopic techniques and by conductivity and magnetic susceptibility measurements.

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An Efficient Parallel Gauss-Seidel Algorithm On A 3d Torus Network-On-Chip, Khaled Day, Mohammad H. Al-Towaiq Apr 2025

An Efficient Parallel Gauss-Seidel Algorithm On A 3d Torus Network-On-Chip, Khaled Day, Mohammad H. Al-Towaiq

Sultan Qaboos University Journal For Science

Network-on-chip (NoC) multi-core architectures with a large number of processing elements are becoming a reality with the recent developments in technology. In these modern systems the processing elements are interconnected with regular NoC topologies such as meshes and tori. In this paper we propose a parallel Gauss-Seidel (GS) iterative algorithm for solving large systems of linear equations on a 3-dimensional torus NoC architecture. The proposed parallel algorithm is O(Nn2/k3) time complexity for solving a system with a matrix of order n on a k×k×k 3D torus NoC architecture with N iterations assuming n and N are large compared to k. …

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The Influence Of Diets Containing Phenols And Condensed Tannins On Protein Picture, Clinical Profile And Rumen Characteristics In Omani Sheep, Osman Mahgoub, Isam T.Kadim, Hamza A. Babiker, Mohammed N. Al-Kindi Apr 2025

The Influence Of Diets Containing Phenols And Condensed Tannins On Protein Picture, Clinical Profile And Rumen Characteristics In Omani Sheep, Osman Mahgoub, Isam T.Kadim, Hamza A. Babiker, Mohammed N. Al-Kindi

Sultan Qaboos University Journal For Science

A study was carried out to investigate the effects of feeding low quality non-conventional feeds (NCF) containing phenols and condensed tannins on health and performance characteristics in Omani sheep. Twelve Omani sheep were fed one of two base roughages, urea-treated palm frond (UTPF) or Rhodesgrass hay, (RGH) plus a commercial concentrate for 63 days. Haematological, serum biochemical and urine analyses were used to assess sheep health. Serum protein fractions were measured using electrophoresis. Urea-treated palm frond contained higher levels of polyphenols and condensed tannins and fiber than Rhodesgrass hay or concentrate feed. Animals fed UTPF had lower feed intake (P<0.05) and lower body gain (P<0.001) than those fed RGH. Rumen liquor of UTPF-fed animals had higher pH, ammonia-nitrogen and butyric fatty acid but lower acetic fatty acid (P<0.05). Animals fed UTPF had higher neutrophil (P<0.05) but lower lymphocyte (P<0.05) and monocyte (P<0.001) counts by the end of the trial than those fed RGH. There were no effects of diet on serum albumin or globulin fraction levels or albumin:globulin ratio. There were no major effects on urine analysis but there was a trend by control animals to have higher protein and specific gravity than treated ones. This study indicated that feeding low quality non-conventional feeds containing polyphenols or tannins would reduce body gain and may produce some effects on clinical parameters. Although tannins are known to influence protein digestion and absorption in ruminants, it did not significantly affect the serum protein picture in sheep.

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The Effect Of Salinity On Solamargine And Solasonine Contents Of Solanum Incanum Plants Grown In Oman, Sana S. Al Sinani, Elsadig A. Eltayeb Apr 2025

The Effect Of Salinity On Solamargine And Solasonine Contents Of Solanum Incanum Plants Grown In Oman, Sana S. Al Sinani, Elsadig A. Eltayeb

Sultan Qaboos University Journal For Science

In addition to its traditional medicinal importance, Solanum incanum (thorn apple) is also a rich source of important cytotoxic glycoalkaloids such as solamargine and solasonine. The effect of salinity stress on solamargine and solasonine production by Solanum incanum plants grown in soil has been investigated. Salinity stress has been applied by adding NaCl to the soil, in concentrations: 0.0 (control), 75, 150, and 225 mM for 8 weeks. HPTLC method was used for analysis of solamargine and solasonine in leaves, stem and roots. A positive correlation was observed between 150 mM NaCl salinity and production of solamargine and solasonine in …

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Dioxygen Binding By Cobalt(Ii) Complexes Of 8,8'-Bis(Aminomethyl)-2,2'-Biquinoline, Muhammad S. Khan, Nawal K. Al-Rasbi, Edwin C.Constable Apr 2025

Dioxygen Binding By Cobalt(Ii) Complexes Of 8,8'-Bis(Aminomethyl)-2,2'-Biquinoline, Muhammad S. Khan, Nawal K. Al-Rasbi, Edwin C.Constable

Sultan Qaboos University Journal For Science

A new series of Co(II) complexes of the type CoLX2 , where Lis a tetra-dentate ligand 8,8'-bis(aminomethyl)-2,2'-biquinoline and X= SCN–, BF4–, I– or NO3– , have been synthesized and characterized. The complexes have magnetic moments in the range typical of a low-spin d7 Co(II) center. The interaction of these Co(II) complexes with dioxygen was studied by E.S.R. spectroscopy. A dicobalt(III) peroxo-bridged complex was formed in DMF solution, associated with the formation of an E.S.R.-silent solution compatible with the formation of low-spin d6 Co(III) species. Similar behavior was also observed for the interaction of these Co(II) complexes with dioxygen in the …

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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 ,

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The Effect Of Starvation On The Liver Of Aphanius Dispar (Pisces; Cyprinodontidae): A Microscopic Study, Taher A. Ba-Omar, Mariam Al-Amri, Jameela Al-Belushi, Reginald Victor Apr 2025

The Effect Of Starvation On The Liver Of Aphanius Dispar (Pisces; Cyprinodontidae): A Microscopic Study, Taher A. Ba-Omar, Mariam Al-Amri, Jameela Al-Belushi, Reginald Victor

Sultan Qaboos University Journal For Science

Stress due to starvation is not an uncommon phenomenon in fresh-and brackish water fish living in arid environments. This study, a part of a larger investigation on the effects of stress due to starvation on the organ systems of Aphanius dispar, a cyprinodont fish in Oman, reports on the histopathological changes in the liver, using light and transmission electron microscopy. The hepatocytes showed structural and ultrastructural changes in response to 24, 48, 72 and 96 hours of starvation. The hepatocytes of the starved fish groups were characterized by a reduction in the size of their cells and their nuclei, chromatin …

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Synthesis And Spectroscopic Properties Of A Fluorosensor For Zn2+ Ions, Nawal K. Al-Rasbi, Bushra Alwihibi, Nada Alnofali Apr 2025

Synthesis And Spectroscopic Properties Of A Fluorosensor For Zn2+ Ions, Nawal K. Al-Rasbi, Bushra Alwihibi, Nada Alnofali

Sultan Qaboos University Journal For Science

The new Schiff base ligand L: (E)-N'-(pyridin-2-ylmethylene)acetohydrazide, was synthesized, and its reaction with Zn(II) ions form the complex: [ZnL2](ClO4)2, as confirmed by X-ray crystallography. This complex is stable in polar and non-polar solvents as proven by NMR. A significant enhancement in the fluorescence was observed from L upon coordination to Zn(II) ions over other transition metals such as Fe(II), Co(II), Ni(II), Cu(II), Cd(II) and Ag(I). These results suggest that L can be used as a selective flourosensor for the detection of Zn(II) ions.

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Fabrication And Surface Characterization Of Poly(4-Aminodiphenylamine) Film Modified Electrode And Its Application For Lead And Cadmium Determination, Mohammed M. Al-Hinaai, Salim H. Al-Harthi, Emad A. Khudaish Apr 2025

Fabrication And Surface Characterization Of Poly(4-Aminodiphenylamine) Film Modified Electrode And Its Application For Lead And Cadmium Determination, Mohammed M. Al-Hinaai, Salim H. Al-Harthi, Emad A. Khudaish

Sultan Qaboos University Journal For Science

Poly(4-aminodiphenylamine), Padpa, film was synthesized electrochemically on a glassy carbon electrode by potentiodynamic repetitive cycling of 4‑aminodiphenylamine (4adpa) in 1.0 M HCl. The mechanistic steps involved the oxidation of the protonated monomer to diimine species which underwent dimerization process to form the mono-charged radical intermediate which was considered as the initiation step for the progress of polymerization. The electrochemical properties and surface morphology of the film modified electrode were characterized using electrochemical and various surface scanning techniques. The XPS data demonstrated the existence of (=N-) bonding responsible for polymer formation, while the AFM image revealed a uniform and symmetrical fiber …

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A Terbium Sensitized Luminescence Method For The Assay Of Flubiprofen In Pharmaceutical Formulations, Salma M.Z. Al-Kindy, Arwa Al-Ghazali, Fakhr Eldin O. Suliman, Haidar A.J. Al-Lawati Apr 2025

A Terbium Sensitized Luminescence Method For The Assay Of Flubiprofen In Pharmaceutical Formulations, Salma M.Z. Al-Kindy, Arwa Al-Ghazali, Fakhr Eldin O. Suliman, Haidar A.J. Al-Lawati

Sultan Qaboos University Journal For Science

A sensitive time-resolved luminescence method for the determination of flubiprofen (FLP) in methanol and in aqueous solution is described. The method is based on the luminescence sensitization of terbium (Tb3+ ) by the formation of a ternary complex with FLP in the presence of 4,7 diphenyl 1,10 phenanthroline (DPP) as co-ligand, and Tween-20 as surfactant. The signal for Tb-FLP-DPP was monitored at λex = 285 nm and λem = 552 nm. Optimum conditions for the formation of the complex in an aqueous system were TRIS buffer, pH 8.0, DPP (2.5Å~10−7 M), Tween-20 (0.30%) and 4Å~10-5 mol L-1 of Tb3+ which …

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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.

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Effects Of Pesticide Temephos On The Liver Of Aphanius Dispar (Rüppell 1828) (Pisces: Cyprinodontidae): A Microscopic Study, Taher A. Ba-Omar, Iman Al-Kharusi, Reginald Victor Apr 2025

Effects Of Pesticide Temephos On The Liver Of Aphanius Dispar (Rüppell 1828) (Pisces: Cyprinodontidae): A Microscopic Study, Taher A. Ba-Omar, Iman Al-Kharusi, Reginald Victor

Sultan Qaboos University Journal For Science

The effects of the pesticide temephos, at different concentrations, on the liver of Aphanius dispar, (Rüppell 1828) a cyprinodont fish, have been described. The changes in the liver tissue after exposure to 1 ppm, 5 ppm, 10 ppm and 25 ppm concentrations of temephos have been presented. Light and transmission electron microscopy showed that the degeneration of the liver cells commenced after exposure to 1 ppm and steadily progressed to show maximum changes at 25 ppm. Histopathological changes included the dilation of sinusoids, an increase in the number of lipid droplets and cytoplasmic vacuolation, pyknosis of the nuclei and focal …

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Optimised Methods For Quantitative Analysis Of Solasodine And Its Glycoside Solamargine By High Performance Liquid Chromatography, Sana S. Al-Sinani, Elsadig A. Eltayeb Apr 2025

Optimised Methods For Quantitative Analysis Of Solasodine And Its Glycoside Solamargine By High Performance Liquid Chromatography, Sana S. Al-Sinani, Elsadig A. Eltayeb

Sultan Qaboos University Journal For Science

Improved and simplified HPLC conditions for the determination and quantification of both the steroidal glycoalkaloid (solamargine) and its aglycone (solasodine) are described. The best isocratic conditions were developed using a C18 column and methanol in combination with an ammonium dihydrogen phosphate buffer. The isocratic conditions were shown to be more reproducible, less time consuming and to give sharper peaks (better separation). The effects of adjusting solvent: buffer ratio, buffer pH and buffer molarity were evaluated.

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Volatile Compounds Of The Leaves And Flowers Of Lavandula Dhofarensis A.G. Miller, John R. Williams, Majekodunmi O. Fatope, Salma M.Z. Al-Kindy, Fakhr Eldin O. Suliman, Salim H. Al-Saidi Apr 2025

Volatile Compounds Of The Leaves And Flowers Of Lavandula Dhofarensis A.G. Miller, John R. Williams, Majekodunmi O. Fatope, Salma M.Z. Al-Kindy, Fakhr Eldin O. Suliman, Salim H. Al-Saidi

Sultan Qaboos University Journal For Science

The leaves and flowers of Lavandula dhofarensis were collected from the Dhofar region of Oman and hydro-distilled to give low boiling volatiles, which did not condense at 10 oC. The dichloromethane extract of the hydrosol was analyzed by GC/FID and GC/MS. Sixty four compounds were identified in the volatiles of the leaves, accounting for 78.7% of the total. The major components were caryophyllene oxide (8.0%), germacrene (7.9%), spathulenol (7.8%), and b-caryophyllene (6.6%). Eighty six compounds were also identified in the volatiles of the leaves plus flowers, comprising 94.5% of the total. The major compounds were camphor (12.9%), viridiflorol (10.5%), a-terpinyl …

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A Wavelet-Based Energetic Approach For The Analysis Of Electroencephalogram, Abul Hasan Siddiqi, Hulya Kodal Sevindir Apr 2025

A Wavelet-Based Energetic Approach For The Analysis Of Electroencephalogram, Abul Hasan Siddiqi, Hulya Kodal Sevindir

Sultan Qaboos University Journal For Science

Electroencephalography (EEG) is the recording of electrical activity along the scalp produced by the firing of neurons within the brain. The main application of EEG is in the case of epilepsy, as epileptic activity can create clear abnormalities on a standard EEG study. EEG signals, like many biomedical signals, are highly non-stationary by their nature. Wavelet analysis has found a prominent position in the investigation of biomedical signals for its ability to analyze such signals, in particular EEG signals. Wavelet transform is capable of separating the signal energy among different frequency bands (i.e., different scales), achieving a good compromise between …

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First Steps In Mesh Wifi Network Design By Genetic Algorithm, Martin B. Reed, Stuart Nash Apr 2025

First Steps In Mesh Wifi Network Design By Genetic Algorithm, Martin B. Reed, Stuart Nash

Sultan Qaboos University Journal For Science

Given a mesh of wireless nodes for WiFi customers covering a city district, we describe a genetic algorithm-based approach to the problem of selecting a small fixed number of nodes as gateways to the internet, and linking the remaining nodes to the gateways either directly or by 'hopping', to create an efficient mesh network structure. The algorithm uses a modification of k-means clustering to allocate nodes to gateways.

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Error Analysis Of An Explicit Finite Difference Approximation For The Space Fractional Wave Equations, N.H. Sweilam, T.A. Assiri Apr 2025

Error Analysis Of An Explicit Finite Difference Approximation For The Space Fractional Wave Equations, N.H. Sweilam, T.A. Assiri

Sultan Qaboos University Journal For Science

In this paper, the space fractional wave equation (SFWE) is numerically studied, where the fractional derivative is defined in the sense of Caputo. An explicit finite difference approximation (EFDA) for SFWE is presented. The stability and the error analysis of the EFDA are discussed. To demonstrate the effectiveness of the approximated method, some test examples are presented.

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Environmental Aspects Of The Accelerated Urbanization In Sana’A, Yemen, Ahmed M. Alderwish, Fayad A. Alderwish Apr 2025

Environmental Aspects Of The Accelerated Urbanization In Sana’A, Yemen, Ahmed M. Alderwish, Fayad A. Alderwish

Sultan Qaboos University Journal For Science

From an environmental viewpoint, the prevailing health problems must be a “first priority” in all major development projects. Public water supply provides only 36% of domestic water. Disinfection of public water supply from the south well field is essential to avoid health problems. About 60% of the drinking water sold by ‘hygienic’ stations is of questionable quality. Expansion and upgrading in hospitals, pharmacies and industries (waste producers) will have an immediate impact on the amount of hazardous waste that will have to be disposed of. To achieve a sustainable urban development and to avoid environment/resources degradation, care should be taken …

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Dynamical Properties Of Omani Crude Oils For Flow Through A Vertical Annulus And A Cylindrical Pipe, Sayyadul Arafin, S.M. Mujibur Rahman Apr 2025

Dynamical Properties Of Omani Crude Oils For Flow Through A Vertical Annulus And A Cylindrical Pipe, Sayyadul Arafin, S.M. Mujibur Rahman

Sultan Qaboos University Journal For Science

We have initially investigated the temperature dependence of density and viscosity of a number of crude oils, collected from various hydrocarbon reservoirs in Oman. The measured data are then utilized to investigate the flow dynamics of these hydrocarbon fluids under gravity and applied pressures at various temperatures. We have modeled the flow of the various crude oil samples through a vertical (a) annulus and (b) cylindrical pipe - all treated within the Newtonian fluid flow approximation of a laminar flow - to investigate the flow properties of these samples. A computer program is developed so that the temperature dependence of …

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Comparison Of The Physiological Age Of Adult Resting Versus Flying Culex Quinquefasciatus (Diptera: Culicidae), D.M. Roberts Apr 2025

Comparison Of The Physiological Age Of Adult Resting Versus Flying Culex Quinquefasciatus (Diptera: Culicidae), D.M. Roberts

Sultan Qaboos University Journal For Science

Relatively little is known about the physiological age of resting mosquitoes. In this study, Culex quinquefasciatus Say had a similar proportion of males (75%) in the resting as in the flying population (76%), but among the females, there were significant differences between the physiological age of the resting and flying populations. The proportion of unfed females (51%) was significantly smaller in the resting than in the flying female group (82%). By contrast, in the resting group, there were much higher proportions of blood-fed (28% compared with 4%) and to a lesser extent gravid (21% compared with 14%) females. Of the …

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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 …

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Screening And Purification Of A Chymotrypsin Inhibitor From Entrolobium Saman Seeds, Maher Ali. Maqtari, A.B. Mohamed. Saad Apr 2025

Screening And Purification Of A Chymotrypsin Inhibitor From Entrolobium Saman Seeds, Maher Ali. Maqtari, A.B. Mohamed. Saad

Sultan Qaboos University Journal For Science

A chymotrypsin inhibitor was isolated and purified from the seeds of Enterolobium saman (Leguminaceae family) by extraction with 100 mM phosphate buffer, heat treatment, ammonium sulphate precipitation, ion-exchange chromatography on DEAEcellulose and filtration through Sephadex G-75. The final preparation appeared to be homogeneous by both chromatographic and electrophoretic analyses. ESCI had a molecular weight of about 17,890 and an isoelectric point of 5.8. ESCI inhibited bovine chymotrypsin at an inhibitor-enzyme molar ratio of 1:2. The inhibition mode of chymotrypsin inhibitor was competitive on bovine chymotrypsin. Investigation has been carried out on the complex formed between chymotrypsin and chymotrypsin inhibitor by …

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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 …

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Integumentary Histology Of The Amphibious Blenny, Isteblennius Edentulus (Forester And Schneider, 1801), Taher Ba-Omar, Maisoon M. Al-Riyami Apr 2025

Integumentary Histology Of The Amphibious Blenny, Isteblennius Edentulus (Forester And Schneider, 1801), Taher Ba-Omar, Maisoon M. Al-Riyami

Sultan Qaboos University Journal For Science

The skin of the amphibious blenny, Istiblennius edentulus, was studied using both light and scanning electron microscopy. Rich vascularisation was found immediately below the epidermis and the dermis. Surface epithelial cells displayed microridges in a fingerprint-like pattern. It was speculated that this increased surface area may aid in the adhesion of mucous secretions as well as to increase the surface area for gas exchange. The number of pores on the dorsal side (6.3x103 per mm2) was significantly higher than that on the ventral side (4.3x103 per mm2). The thickness of the skin on the dorsal side was measured at 31.6±10.0µm …

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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 …

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