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Articles 208051 - 208080 of 5207130

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Photocatalytic Degradation Of Bisphenol A (Bpa) Present In Aqueous Solution Using G-C3n4 Nanosheets Under Solar Light Irradiation, Rengaraj Selvaraj Apr 2025

Photocatalytic Degradation Of Bisphenol A (Bpa) Present In Aqueous Solution Using G-C3n4 Nanosheets Under Solar Light Irradiation, Rengaraj Selvaraj

Sultan Qaboos University Journal For Science

A graphite-like carbon nitride (g-C3N4) nanosheet sample was synthesized from a melamine precursor by a method of simple direct heating in a semi-closed system followed by thermal oxidation etching at 550 °C for 12 h. The sample was labelled as (g-C3N412h) and was systematically characterized. Moreover, the results were then compared with a pristine g-C3N4 sample for the degradation of Bisphenol A (BPA) present in water. Bisphenol A (BPA) is an endocrine disruptor. It is known that the BPA is one of the most harmful organic materials and that it does not degrade easily in the environment. It was therefore …

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Lithology Characteristics And Diagenesis Of Late Pleistocene-Holocene Coastal Terraces Of The Yemeni Red Sea: Implication For Paleoclimatic Records, Ahmed Saif Al-Mikhlafi Apr 2025

Lithology Characteristics And Diagenesis Of Late Pleistocene-Holocene Coastal Terraces Of The Yemeni Red Sea: Implication For Paleoclimatic Records, Ahmed Saif Al-Mikhlafi

Sultan Qaboos University Journal For Science

The development of Holocene-Pleistocene fringing reefs in the Yemeni Red Sea (YRS) is controlled by sediment input and variations in accommodation space. Lithostratigraphic correlation of environmental facies in the investigated sites shows a sequence of successive events, and each can be subdivided into 2 or 3 main sequences. The upper sequence is characterized by the dominance of coral and coralline algal frameworks. The lower sequences are varied and can be attributed to spatial and temporal variability. Meteoric diagenesis is the most dominant and includes dissolution, calcrete, and coral recrystallization. Lithologic and mineralogic investigations of the Pleistocene-Holocene coral reefs display three …

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Green Preparation Of Aluminum-Based Metal-Organic Framework (Al-Mof) From Waste Plastic Bottles And Waste Aluminum Scraps, Saleh N. Al-Busafi Apr 2025

Green Preparation Of Aluminum-Based Metal-Organic Framework (Al-Mof) From Waste Plastic Bottles And Waste Aluminum Scraps, Saleh N. Al-Busafi

Sultan Qaboos University Journal For Science

The vast use of polyethylene terephthalate (PET) drinking water bottles has increased dramatically worldwide in recent decades, inflicting severe consequences on the environment. According to the latest survey, a million plastic bottles are bought around the globe every minute. The non-biodegradable nature of PET materials has led to a huge accumulation of plastic in waste landfills. Among the current recycling methods used to solve this environmental problem is chemical recycling. In this method, PET bottles are converted back cleanly into their starting materials: terephthalic acid and ethylene glycol. This paper unveils the exploitation of recycling products from PET bottles and …

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Improved Diagonal Hessian Approximations For Large-Scale Unconstrained Optimization, Ahmed Al-Siyabi Apr 2025

Improved Diagonal Hessian Approximations For Large-Scale Unconstrained Optimization, Ahmed Al-Siyabi

Sultan Qaboos University Journal For Science

We consider some diagonal quasi-Newton methods for solving large-scale unconstrained optimization problems. A simple and effective approach for diagonal quasi-Newton algorithms is presented by proposing new updates of diagonal entries of the Hessian. Moreover, we suggest employing an extra BFGS update of the diagonal updating matrix and use its diagonal again. Numerical experiments on a collection of standard test problems show, in particular, that the proposed diagonal quasi-Newton methods perform substantially better than certain available diagonal methods.

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Improved Fletcher-Reeves Methods Based On New Scaling Techniques, Amal Al-Saidi Apr 2025

Improved Fletcher-Reeves Methods Based On New Scaling Techniques, Amal Al-Saidi

Sultan Qaboos University Journal For Science

This paper introduces a scaling parameter to the Fletcher-Reeves (FR) nonlinear conjugate gradient method. The main aim is to improve its theoretical and numerical properties when applied with inexact line searches to unconstrained optimization problems. We show that the sufficient descent and global convergence properties of Al-Baali for the FR method with a fairly accurate line search are maintained. We also consider the possibility of extending this result to less accurate line search for appropriate values of the scaling parameter. The reported numerical results show that several values for the proposed scaling parameter improve the performance of the FR method …

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A Surface Network Based On Polytyramine/ Gold Nanoparticles: Characterization, Kinetics, Thermodynamics And Selective Determination Of Norepinephrine, Emad A. Khudaish, Arwa Al-Maskari Apr 2025

A Surface Network Based On Polytyramine/ Gold Nanoparticles: Characterization, Kinetics, Thermodynamics And Selective Determination Of Norepinephrine, Emad A. Khudaish, Arwa Al-Maskari

Sultan Qaboos University Journal For Science

A solid-state sensor was fabricated by a spontaneous electrochemical deposition of polytyramine (Ptyr) film onto a glassy carbon electrode (GCE) which was further peripherally supported by gold nanoparticles (AuNPs). The surface materials of the developed sensor (AuNPs.Ptyr-GCE) were characterized by X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The rate constant of charge transfers (kct) of the as-prepared sensor (8.77 × 10-4 cm/s) was evaluated by fitting the charge transfer resistance (Rct) data in the presence of ferric-ferrous hexacyanide redox couple solution, [Fe(CN)6]3-/4-. The voltammetric behavior of norepinephrine (NOR) was confirmed to …

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Parasitic Contamination Of Local Drinking Water Sources In Aba Metropolis, Abia State, Nigeria, Blessing U. Ejike, Carmelita C. Ohaeri, Ebube C. Amaechi Apr 2025

Parasitic Contamination Of Local Drinking Water Sources In Aba Metropolis, Abia State, Nigeria, Blessing U. Ejike, Carmelita C. Ohaeri, Ebube C. Amaechi

Sultan Qaboos University Journal For Science

Water-borne parasitic infections have become a source of concern in recent times due to the contamination of various water sources. A survey on the parasitic contamination of local drinking water sources in Aba metropolis was carried out between August and October 2018. This was done to evaluate the extent of contamination of these water sources and their public health implications. A total number of eighty (80) water samples were investigated from five (5) major water sources within the study area using the standard sedimentation method and examined for parasite cysts, eggs and larvae. Physical/macroscopic examination was done to determine the …

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Travelling Wave Solutions For Fisher’S Equation Using The Extended Homogeneous Balance Method, Mohammad M. Fares, Usama M. Abdelsalam, Faiza M. Allehiany Apr 2025

Travelling Wave Solutions For Fisher’S Equation Using The Extended Homogeneous Balance Method, Mohammad M. Fares, Usama M. Abdelsalam, Faiza M. Allehiany

Sultan Qaboos University Journal For Science

In this work, the extended homogeneous balance method is used to derive exact solutions of nonlinear evolution equations. With the aid of symbolic computation, many new exact travelling wave solutions have been obtained for Fisher’s equation and Burgers-Fisher equation. Fisher’s equation has been widely used in studying the population for various systems, especially in biology, while Burgers-Fisher equation has many physical applications such as in gas dynamics and fluid mechanics. The method used can be applied to obtain multiple travelling wave solutions for nonlinear partial differential equations.

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Predator-Prey Model With Refuge, Fear And Z-Control, Ibrahim M. Elmojtaba, Kawkab Al-Amri, Qamar J.A. Khan Apr 2025

Predator-Prey Model With Refuge, Fear And Z-Control, Ibrahim M. Elmojtaba, Kawkab Al-Amri, Qamar J.A. Khan

Sultan Qaboos University Journal For Science

In this paper, we consider a predator-prey model incorporating fear and refuge. Our results show that the predator-free equilibrium is globally asymptotically stable if the ratio between the death rate of predators and the conversion rate of prey into predator is greater than the value of prey in refuge at equilibrium. We also show that the co-existence equilibrium points are locally asymptotically stable if the value of the prey outside refuge is greater than half of the carrying capacity. Numerical simulations show that when the intensity of fear increases, the fraction of the prey inside refuge increases; however, it has …

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Boolean Zero Square (Bzs) Semigroups, Pinto G.A. Apr 2025

Boolean Zero Square (Bzs) Semigroups, Pinto G.A.

Sultan Qaboos University Journal For Science

We introduce a new class of semigroups, that we call BZS - Boolean Zero Square-semigroups. A semigroup S with a zero element, 0, is said to be a BZS semigroup if, for every , we have or . We obtain some properties that describe the behaviour of the Green’s equivalence relations , , and . Necessary and sufficient conditions for a BZS semigroup to be a band and an inverse semigroup are obtained. A characterisation of a special type of BZS completely 0-simple semigroup is presented.

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Delineation Of Weathered Layer Using Uphole And Surface Seismic Refraction Methods In Parts Of Niger Delta, Nigeria, Mfoniso Aka, Okechukwu Agbasi Apr 2025

Delineation Of Weathered Layer Using Uphole And Surface Seismic Refraction Methods In Parts Of Niger Delta, Nigeria, Mfoniso Aka, Okechukwu Agbasi

Sultan Qaboos University Journal For Science

Uphole and surface seismic refraction surveys were carried out in parts of the Niger Delta, Nigeria, to delineate weathering thickness and velocity associated with aweathered layer. A total of twelve uphole and surface seismic refraction surveyswere shot, computed and analyzed. The velocity of the uphole seismic refraction ranged from 344.8 to 680.3 m/s with a thickness of 5.45 to 13.35 m. Surface seismic refraction ranged from 326.6 to 670.2 m/s and 4.30 to 12.0 m, respectively. The average velocity and thickness ranged from 559.6 to 548.0 m/s and 9.43 to 8.63m with differences of 11.6 m/s and 0.83 m respectively. …

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Comparing Science And Engineering Students Using The Force Concept Inventory In Introductory Physics Courses, Nazife Koca, Nidhal Sulaiman Apr 2025

Comparing Science And Engineering Students Using The Force Concept Inventory In Introductory Physics Courses, Nazife Koca, Nidhal Sulaiman

Sultan Qaboos University Journal For Science

This work is intended to analyze and compare the performance of two groups of students on the understanding of force and motion concepts using the Force Concept Inventory (FCI). The FCI test serves questions on basic Newtonian concepts where the answers inclyde the correct response and commonly misconceived alternatives. The FCI test was implemented twice as pre and post-tests for two introductory calculus-based physics courses offered at the Sultan Qaboos University (SQU) in Oman for students mainly from the Colleges of Sciences, Education and Agriculture and the students from the College of Enginerring in the Spring 2017 and Spring 2018 …

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Determination Of Toxic Metals In Tobacco From Selected Imported Cigarette Brands And Local Tobacco In Iraqi Markets, Wedad H. Al-Dahhan, Emad Yousif, Hassan Hashim Apr 2025

Determination Of Toxic Metals In Tobacco From Selected Imported Cigarette Brands And Local Tobacco In Iraqi Markets, Wedad H. Al-Dahhan, Emad Yousif, Hassan Hashim

Sultan Qaboos University Journal For Science

Metals are essential in many physiological processes in the human body, but can also be detrimental to our health when the concentration is not within recommended permissible limits. Various types of cigarettes were selected from the local markets in Iraq in addition to the Iraqi tobacco from Sulaymaniyah governorate to conduct tests of the elements in these species. The selected samples were tested using EDX instrument. Results proved the presence of dangerous elements such as Cr, Ni, Zn, As, Al, P, S, Pb, Cd, Sn and Sb in quantities which could greatly affect the health of the smoker and have …

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Microfacies, Biostratigraphy, Depositional Environment, Seismic Refraction And Correlation Of Coralline Limestones Of The Barzaman Formation (Oligocene-Pliocene? Al-Khod, Muscat Area, Sultanate Of Oman), Frank Mattern Journal, Abdul Razak Al-Sayigh, Mohammed Farfour, Andreas Scharf, Shaima Al-Amri, Juhaina Al-Omairi Apr 2025

Microfacies, Biostratigraphy, Depositional Environment, Seismic Refraction And Correlation Of Coralline Limestones Of The Barzaman Formation (Oligocene-Pliocene? Al-Khod, Muscat Area, Sultanate Of Oman), Frank Mattern Journal, Abdul Razak Al-Sayigh, Mohammed Farfour, Andreas Scharf, Shaima Al-Amri, Juhaina Al-Omairi

Sultan Qaboos University Journal For Science

The “Carbonates” unit of the Oligocene-Pliocene Barzaman Formation, north of the Oman Mountains at Sultan Qaboos Campus, is at least 10 m thick. It consists of three coralline limestone beds in (1) bedded facies (base; eastern outcrop), (2) very thick-bedded debris facies (middle; western and eastern outcrops) and (3) bedded facies (top; western and eastern outcrops). These three beds can be correlated between two outcrops over a distance of 160 m based on facies, stratigraphic positions and thickness as well as on a seismic refraction survey. The most common bioclasts are poritid corals, red algae and benthic foraminifers. Dasycladacean algae …

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Dicyclic Groups And Frobenius Manifolds, Yassir Dinar, Zainab Al-Maamari Apr 2025

Dicyclic Groups And Frobenius Manifolds, Yassir Dinar, Zainab Al-Maamari

Sultan Qaboos University Journal For Science

The orbits space of an irreducible representation of a finite group is a variety whose coordinate ring is finitely generated by homogeneous invariant polynomials. Boris Dubrovin showed that the orbits spaces of the reflection groups acquire the structure of polynomial Frobenius manifolds. Dubrovin’s method to construct examples of Frobenius manifolds on orbits spaces was carried for other linear representations of discrete groups which have in common that the coordinate rings of the orbits spaces are polynomial rings. In this article, we show that the orbits space of an irreducible representation of a dicyclic group acquires two structures of Frobenius manifolds. …

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Doubly Periodic Functions And Floquet Theorem, Nafya H. Mohammed Journal, Nazaneen Q.M. Saeed Apr 2025

Doubly Periodic Functions And Floquet Theorem, Nafya H. Mohammed Journal, Nazaneen Q.M. Saeed

Sultan Qaboos University Journal For Science

In complex analysis, an elliptic function is a meromorphic function that is periodic in two directions. Just as a periodic function of a real variable is defined by its values on an interval, an elliptic function is determined by its values on a fundamental parallelogram, which then repeat in a lattice. Such a doubly periodic function cannot be holomorphic, as it would then be a bounded entire function, and by Liouville's theorem every such function must be constant. Historically, elliptic functions were first discovered by Niels Henrik Abel as inverse functions of elliptic integrals, and their theory was improved by …

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Effects Of Thermal Stratification And Anisotropic Porous Material In A Symmetrically Heated Vertical Channel, Basant K. Jha, Muhammad K. Musa, Abiodun O. Ajibade Apr 2025

Effects Of Thermal Stratification And Anisotropic Porous Material In A Symmetrically Heated Vertical Channel, Basant K. Jha, Muhammad K. Musa, Abiodun O. Ajibade

Sultan Qaboos University Journal For Science

The coexistence in nature of thermally stratified fluids and directionally inclined porous structures abound in geophysical fluid flow. Despite their important applications especially in underground flow, their combined effects on natural convection have not been intensively investigated. This article aims to investigate a fully developed time dependent natural convection of viscous incompressible stably stratified fluid in the presence of anisotropic porous material. The semi analytical solutions of the governing equations for the temperature and velocity fields are obtained using the Laplace Transform Technique, Riemann Sum Approximation and D’Alembert Methods. The choice of the D’Alembert Method is to provide a systematic …

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Magneto-Optical Kerr Microscopy For Nano-Structures With Perpendicular Magnetic Anisotropy, Suleiman Al-Risi, Rachid Sbiaa, Hanan Mohammed, Jurgen Kosel Apr 2025

Magneto-Optical Kerr Microscopy For Nano-Structures With Perpendicular Magnetic Anisotropy, Suleiman Al-Risi, Rachid Sbiaa, Hanan Mohammed, Jurgen Kosel

Sultan Qaboos University Journal For Science

Magneto-optical Kerr effect (MOKE) microscopy is a powerful imaging technique that can be employed to study the magnetization reversal of thin films and nanoscale structures. In this work, we describe the MOKE microscopy which is used to observe nanomagnetic domain structures of Co/Pt multilayers (MLs) and plot hysteresis loops. We were able to image sub-micrometer size magnetic domains and trace their evolution in a ms time scale with a lateral spatial resolution down to 300 nm. The magnetization reversal for Co/Pt MLs is described by the expansion of the domains in all directions as dendritic domain wall propagation. For a …

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A Statistical Analysis On Forecasting Prices Of Some Important Food Commodities In Bangladesh, Mohammad Abdullah Al-Mamun, Sheikh Mohammad Sayem, Khondaker Mohammad Mostafizur Rahman, Mohammad Zakir Hossain Apr 2025

A Statistical Analysis On Forecasting Prices Of Some Important Food Commodities In Bangladesh, Mohammad Abdullah Al-Mamun, Sheikh Mohammad Sayem, Khondaker Mohammad Mostafizur Rahman, Mohammad Zakir Hossain

Sultan Qaboos University Journal For Science

This paper investigates the best possible forecasting price models for three important agricultural products in Bangladesh namely potato, onion and garlic using time-series and secondary data from January 2000 to December 2014. The main objective of this paper is to find out the appropriate time series models using some of the latest selection criteria that could describe the best price patterns of the above mentioned three crops. To forecast the prices of the crops, the ARIMA models were used, based on model selection criteria and error statistics among the competing models. The overall findings of the study indicate that the …

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Effect Of Smokeless Tobacco Product, Afzal, On The Reproductive Hormones And Gonadal Pathology Of Wistar Rats, Nawal Al-Mukhaini, Taher Ba Omar, Elsadig Eltayeb, Aisha Al Khayat Al-Shehi, Jamila Al-Belushi, Nafila Al-Riyami, Romulo Cipriano, Kawther Al-Adawi Apr 2025

Effect Of Smokeless Tobacco Product, Afzal, On The Reproductive Hormones And Gonadal Pathology Of Wistar Rats, Nawal Al-Mukhaini, Taher Ba Omar, Elsadig Eltayeb, Aisha Al Khayat Al-Shehi, Jamila Al-Belushi, Nafila Al-Riyami, Romulo Cipriano, Kawther Al-Adawi

Sultan Qaboos University Journal For Science

Afzal is a common smokeless tobacco product (STP) in Oman, and it is believed to contain toxins that may affect the reproductive hormones and hence reproductive function. This study assessed the effect of Afzal on the gonads of Wistar rats. In order to assess gonad toxicity induced by this STP, an aqueous extract of Afzal was added to drinking water to be administrated orally to Wistar albino rats (n = 72) classified as young (4 weeks old) and adult (20 weeks old) of both genders weighing between 60-80 g and 150-240 g respectively for 8 weeks. The rats were divided …

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Nutrient Content, In Vitro Ruminal Fermentation Characteristics And Antimethanogenic Potential Of Three Algerian Asteraceae Species, Serine Amokrane, Rabah Arhab, Serina Calabro, Raffaella Tudisco, Federico Infascelli, Moufida Aggoun Apr 2025

Nutrient Content, In Vitro Ruminal Fermentation Characteristics And Antimethanogenic Potential Of Three Algerian Asteraceae Species, Serine Amokrane, Rabah Arhab, Serina Calabro, Raffaella Tudisco, Federico Infascelli, Moufida Aggoun

Sultan Qaboos University Journal For Science

The in vitro rumen fermentation parameters and the antimethanogenic potential of three Asteraceae species: Chamaemelum nobile, Centaurea pulata and Chrysanthemum segetum were determined. Serum bottles containing 200 mg of each plant and 30 ml of the culture medium (artificial saliva plus rumen juice) were incubated for 24 h. After incubation, pH, volatile fatty acid (VFA), ammonia (NH3) and methane (CH4) productions were recorded. Methanogens and protozoa were quantified using a Real Time PCR technique (qPCR). Cumulative gas productions, in vitro organic matter digestibility and VFA were not significantly affected by the added species when compared to the control (P > 0.05). …

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Distribution Of Nutrient Salts And Chlorophyll-A In Surface Water Along The Gulf Of Aden And Arabian Sea Coast, Yemen, Ibrahim A. Al-Akhaly, Nabil A. Al-Shwafi, Shehab A. Al-Kabsh Apr 2025

Distribution Of Nutrient Salts And Chlorophyll-A In Surface Water Along The Gulf Of Aden And Arabian Sea Coast, Yemen, Ibrahim A. Al-Akhaly, Nabil A. Al-Shwafi, Shehab A. Al-Kabsh

Sultan Qaboos University Journal For Science

The distribution of inorganic nutrient salts (ammonium, nitrite, nitrate, phosphate and silicate) and phytoplankton chlorophyll-a (Chl-a) were investigated in the Gulf of Aden and along the Arabian Sea coast, Yemen. Seventy two surface water samples were collected during cruises in August 2014 and January 2015. The sampled area extends from As Suqayyah in the west of the Gulf of Aden to Hawf in the east. The study showed that the average values of nutrient salts (μg/l) in waters collected in August 2014 and January 2015 were 0.83 and 0.60, 10.98 and 10.03, 16.41 and 14.73, 10.36 and 8.76, and 29.72 …

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Dimension Reduction And Relaxation Of Johnson’S Method For Two Machines Flow Shop Scheduling Problem, Mekonnen Redi, Mohammad Ikram Apr 2025

Dimension Reduction And Relaxation Of Johnson’S Method For Two Machines Flow Shop Scheduling Problem, Mekonnen Redi, Mohammad Ikram

Sultan Qaboos University Journal For Science

The traditional dimensionality reduction methods can be generally classified into Feature Extraction (FE) and Feature Selection (FS) approaches. The classical FE algorithms are generally classified into linear and nonlinear algorithms. Linear algorithms such as Principal Component Analysis (PCA) aim to project high dimensional data to a lower-dimensional space by linear transformations according to certain criteria. The central idea of PCA is to reduce the dimensionality of the data set consisting of a large number of variables. In this paper, PCA was used to reduce the dimension of flow shop scheduling problems. This mathematical procedure transforms a number of (possibly) correlated …

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Behavior Of Small Variable Mass Particle In Electromagnetic Copenhagen Problem, Abdullah A. Ansari Apr 2025

Behavior Of Small Variable Mass Particle In Electromagnetic Copenhagen Problem, Abdullah A. Ansari

Sultan Qaboos University Journal For Science

The paper presents the behavior of the motion properties of the variable mass test particle (third body), moving under the influence of the two equal primaries having electromagnetic dipoles. These primaries move on the same circular path around their common center of mass in the same plane. We have determined the equations of motion of the test particle whose mass varies according to Jean's law. Using the system of equations of motion we have evaluated the locations of equilibrium points, their movements and basins of the attracting domain. Finally, we examine the stability of these equilibrium points, all of which …

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Magnetization Dynamics In A Perpendicular Anisotropy Free Layer Under A Spin Torque Effect With Crossed Polarization, Nafeesa Rahman, Rachid Sbiaa Apr 2025

Magnetization Dynamics In A Perpendicular Anisotropy Free Layer Under A Spin Torque Effect With Crossed Polarization, Nafeesa Rahman, Rachid Sbiaa

Sultan Qaboos University Journal For Science

The transfer of spin angular momentum from a spin polarized current provides an efficient way of reversing the magnetization direction of the free layer of the magnetic tunnel junction (MTJ), and while faster reversal will reduce the switching energy, this in turn will lead to low power consumption. In this work, we propose a design where a spin torque oscillator (STO) is integrated with a conventional magnetic tunnel junction (MTJ) which will assist in the ultrafast reversal of the magnetization of the free layer of the MTJ. The structure formed (MTJ stacked with STO), will have the free layer of …

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Mössbauer Study Of Weathered H-Meteorite From The Desert Of Oman, Ahmed D. Al-Rawas, Abbasher M. Gismelseed, Subhi Nasir, Ali A. Yousif, Mohamed E. Elzain, Hisham Widatallah, Ali Al-Kathiri, Susan Al-Riyami Apr 2025

Mössbauer Study Of Weathered H-Meteorite From The Desert Of Oman, Ahmed D. Al-Rawas, Abbasher M. Gismelseed, Subhi Nasir, Ali A. Yousif, Mohamed E. Elzain, Hisham Widatallah, Ali Al-Kathiri, Susan Al-Riyami

Sultan Qaboos University Journal For Science

A number of meteorites from the desert of Oman, classified as H-chondrites, with known and unknown ages, were studied by using 57Fe Mössbauer spectroscopy to determine their Fe3+-bearing compositions. Mössbauer spectra measured at 78 K were composed of paramagnetic doublets superimposed on magnetic sextets. The doublets are assigned to the silicate minerals olivine and pyroxene and Fe3+ phases. The magnetic sextets in most samples showed the presence of at least three magnetic phases, namely troilite, magnetite and kamacite, which commonly exist in most ordinary chondrites. The relative amounts (area %) of Fe3+ in the known-age meteorites, determined from the Mössbauer …

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Nutritional Value Of Vegetable Wastes As Livestock Feed, Osman Mahgoub, Hafidh Al-Mahrouqi, Sadeq Al-Lawati, Rabea Al-Muqbali Apr 2025

Nutritional Value Of Vegetable Wastes As Livestock Feed, Osman Mahgoub, Hafidh Al-Mahrouqi, Sadeq Al-Lawati, Rabea Al-Muqbali

Sultan Qaboos University Journal For Science

A study was carried out to evaluate the nutritional value of spirulina (Arthrospira platensis) to determine its potential use for feeding livestock in Oman. Spirulina was grown in wooden cubicles and harvested after 10 days. One batch of spirulina was dried by centrifugation (CS) and the other was dried in an oven without centrifugation (NCS). Samples were analyzed for dry matter (DM) and proximate chemical components. An in vitro assessment was carried out to measure gas production and in vitro DM degradability of spirulina. The DM was 56.1 and 57.1% in CS and NCS, respectively. The proximate composition for CS …

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Flora, Life-Forms And Biological Spectrum Of Muscat Governorate, Neelam Sherwani Apr 2025

Flora, Life-Forms And Biological Spectrum Of Muscat Governorate, Neelam Sherwani

Sultan Qaboos University Journal For Science

The present study evaluated the floristic diversity and biological spectrum of Muscat Governorate, Sultanate of Oman. Heterogeneity of geology, topography and climatic conditions create a diverse array of habitats across the 3,500 km2 study area, supporting a range of vegetation types. Floristic studies were conducted across 42 sites spread across various habitats such as sand dunes, alluvial plains, gravel plains, wadis, saline dunes, coastal areas, farms and plantations. A total of 264 species belonging to 183 genera and 54 families of angiosperm were documented during sampling the vegetation from different wilayats of the Governorate. Maximum number of species belonged to …

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Synthesis Of Pullulan-Mediated Silver Nanoparticles (Agnps) And Their Antimicrobial Activities, Yusra Al-Owasi, Abdulkhadir Elshafie, Nallusamy Sivakumar, Saif Al-Bahry Apr 2025

Synthesis Of Pullulan-Mediated Silver Nanoparticles (Agnps) And Their Antimicrobial Activities, Yusra Al-Owasi, Abdulkhadir Elshafie, Nallusamy Sivakumar, Saif Al-Bahry

Sultan Qaboos University Journal For Science

The synthesis of silver nanoparticles (AgNPs), using plant extracts, bacteria, fungi and yeasts, and their antimicrobial activities have been widely investigated and well documented. However, pullulan AgNPs and their antimicrobial activities have not received much attention. The objective of this study was to synthesize pullulan AgNPs, characterize them, and test their antibacterial and antifungal activities. Pullulan was extracted from Aureobasidium mangrovei isolated from Oman and, using UV-Vis spectroscopy and Fourier Transform Infrared (FT-IR), found to be identical to the commercial pullulan obtained from Sigma, USA. Transmission electron microscopy (TEM) showed that most of the synthesized particles were poly-dispersed, irregular in …

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Molecular Characterization Of Fumonisin Mycotoxin Genes Of Fusarium Sp Isolated From Corn And Rice Grains, Latifa Al-Husnan, Muneera Al-Kahtani, Randa Farag Apr 2025

Molecular Characterization Of Fumonisin Mycotoxin Genes Of Fusarium Sp Isolated From Corn And Rice Grains, Latifa Al-Husnan, Muneera Al-Kahtani, Randa Farag

Sultan Qaboos University Journal For Science

Fungi mycotoxins can be a serious risk to health and lead to substantial economic loss. The environmental conditions of Saudi Arabia, with its mostly warm temperatures, are conducive to the growth of toxigenic fungi resulting in mycotoxin production in different food items. The current study elucidates the natural occurrence of toxigenic fungi and mycotoxin production in grains in Saudi Arabia. Samples of white rice and corn (yellow, red) grains were collected from different local markets and houses. Three fungal isolates were obtained from the corn and rice grains and examined using Potato Dextrose Agar (PDA) and Carnation Leaf Agar (CLA) …

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