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 35851 - 35880 of 818734

Full-Text Articles in Entire DC Network

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). …

Go to article

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 …

Go to article

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 …

Go to article

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 …

Go to article

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) …

Go to article

Assessment Of Heavy Metal Contamination In Soil In And Around Sohar Industrial Port Area, Oman, Maha Al-Jabri, Daniel Moraetis, Reginald Victor Apr 2025

Assessment Of Heavy Metal Contamination In Soil In And Around Sohar Industrial Port Area, Oman, Maha Al-Jabri, Daniel Moraetis, Reginald Victor

Sultan Qaboos University Journal For Science

The increase in the number of heavy metal emitting sources in industrial areas is a serious issue in pollution science. Sohar Industrial Port (SIP) area is located in the northern part of Oman where different industrial activities like petrochemical production, metal processing, and waste disposal are prevalent. This study comprehensively identified the presence and quantities of heavy metals in the soils of Sohar Industrial Port area and traced their origin to geogenic or anthropogenic sources. Bulk geochemical and mineralogical analyses were carried out on all samples. Environmentally available and bioavailable heavy metals were extracted by diethylenetriaminepentaacetic acid (DTPA) and were …

Go to article

Preliminary Investigations Of Allelopathic Effects And Herbicide-Based Eradication Of Mesquite (Prosopis Juliflora), Salim Al-Abdali, Azan Al-Dhuhli, Hassan Al-Reasi Apr 2025

Preliminary Investigations Of Allelopathic Effects And Herbicide-Based Eradication Of Mesquite (Prosopis Juliflora), Salim Al-Abdali, Azan Al-Dhuhli, Hassan Al-Reasi

Sultan Qaboos University Journal For Science

Velvet mesquite, locally known as al-ghaf bahri (Prosopis juliflora), is a well-known invasive alien plant species in several regions around the world, including Oman, with various environmental effects. The allelopathic effect of P. juliflora leaves and seed pods on native ghaf (P. cineraria) and a crop species, mung bean (Vigna radiata) was demonstrated. Results indicated that P. juliflora extracts have inhibitory effects on seed germination and seedling growth of both species, particularly on P. cineraria when exposed to pod extracts. For eradication experiments, three herbicides (tribenuron methyl, clethodim and 2,4-D & MCPA) were investigated to determine their inhibitory properties on …

Go to article

Effect Of Alarm Chemicals And Predator Kairomones On The Behaviour Of Two Species Of Mosquito Larvae, Derek Roberts, Nargis Al-Alawi, Mai Al-Gharibi Apr 2025

Effect Of Alarm Chemicals And Predator Kairomones On The Behaviour Of Two Species Of Mosquito Larvae, Derek Roberts, Nargis Al-Alawi, Mai Al-Gharibi

Sultan Qaboos University Journal For Science

Mosquito larvae have developed a variety of responses to reduce the risk of predation, but this requires them to be able to identify the different species of predators and respond accordingly. We investigated the behavioural response of two mosquito species to three chemical signals: kairomones from two predators, and also to alarm semiochemicals from killed mosquito larvae. Culex perexiguus mosquito larvae are primarily surface filter-feeders. In response to all three chemical signals, they significantly reduced feeding by the high-risk active bottom scraping of biofilms in favour of the less active (and so lower predator-detection risk) surface filter feeding. Active escape …

Go to article

Petroleum Hydrocarbon Residues In Surficial Sediment Samples From Aden City Coasts, Yemen, Ibrahim Al-Akhaly, Nabil Al-Shwafi, Basem Al-Matari, Eman I.Siam Apr 2025

Petroleum Hydrocarbon Residues In Surficial Sediment Samples From Aden City Coasts, Yemen, Ibrahim Al-Akhaly, Nabil Al-Shwafi, Basem Al-Matari, Eman I.Siam

Sultan Qaboos University Journal For Science

The environmental quality along Aden coasts is affected by the anthropogenic pressure of Aden city. Field work has been carried out to investigate the occurrence of petroleum pollution along these coasts. To determine the status of aliphatic hydrocarbon (AH) (n-C10 to n-C34) and polycyclic aromatic hydrocarbon (PAH) pollution in surface sediments, twenty seven surface sediment samples were collected in July and December 2014 and March 2015 and analysed for AHs and PAHs by using gas chromatography–mass spectrometry (GC-MS) to determine their levels and sources. Concentrations of AHs ranged from 6.25 µg/g at station 5 (Goldmoor) to 41.05 µg/g at station …

Go to article

Effect Of Management System On Serum Copper Level And Haematology Of Jabal Akhdar Breed Goats In Two Sites In Al Jabal Al Akhdar Region Of Oman, I.E.D. Osman Nur El Huda, Bobade Patrick A. Apr 2025

Effect Of Management System On Serum Copper Level And Haematology Of Jabal Akhdar Breed Goats In Two Sites In Al Jabal Al Akhdar Region Of Oman, I.E.D. Osman Nur El Huda, Bobade Patrick A.

Sultan Qaboos University Journal For Science

ABSTRACT: Blood samples were collected from randomly selected healthy Jabal Akhdar breed goats reared in two sites in the Jabal Akhdar region of Oman. Seven males and 65 female goats, age range 2 months to 4 years, raised in Shnoot Al-Dar village were kept under a semi-intensive system (SIS) and 2 males and 18 females, age range 4 months to 5 years, raised in Al-Ala'lana village and kept the under free range system (FRS) were studied. Serum Cu and haematological values were measured. There were no significant (p>0.05) effects of age, sex or serum copper levels on the haematology …

Go to article

Nutritional Value Of Vegetable Wastes As Livestock Feed, Osman Mahgoub, Isam T. Kadim, Yasmin Eltahir, Sadeq Al-Lawatia, Abdulrahim M. Al-Ismaili Apr 2025

Nutritional Value Of Vegetable Wastes As Livestock Feed, Osman Mahgoub, Isam T. Kadim, Yasmin Eltahir, Sadeq Al-Lawatia, Abdulrahim M. Al-Ismaili

Sultan Qaboos University Journal For Science

ABSTRACT: A study was carried out to evaluate the nutritional value of waste from lettuce, green cabbage, red cabbage and cauliflower to determine their potential use for feeding to livestock. Vegetable wastes were dried in a solar tunnel drier. The crude protein (CP), ether extract (EE), total ash, acid detergent fiber (ADF) and neutral detergent fiber (NDF) were 24.1, 2.7, 24.7, 29.3 and 29.0%; 17.7, 2.3, 13.7, 25.6, and 28.7%; 11.9, 1.9, 8.8, 23.1 and 25.6%; 10.3, 0.5, 7.0, 16.1 and 19.6 % (DM basis) in cauliflower, lettuce, green cabbage and red cabbage, respectively. The gross energy (MJ/kg DM) in …

Go to article

Synthesis Of A Flavone Based Fluorescent Probe Bearing A Nitroolefin Moiety For Selective Detection Of Cysteine, Al-Busafi Saleh N., Al-Hamami Nadia M., O. Suliman Fakhr Eldin, Varghese Beena Apr 2025

Synthesis Of A Flavone Based Fluorescent Probe Bearing A Nitroolefin Moiety For Selective Detection Of Cysteine, Al-Busafi Saleh N., Al-Hamami Nadia M., O. Suliman Fakhr Eldin, Varghese Beena

Sultan Qaboos University Journal For Science

In this paper, we report the synthesis, characterization and investigation of the optical properties of a new fluorescent probe, 4ʹ-nitroolefinylflavone (4ʹ-NOF) 1, based on a flavone skeleton and bearing a nitroolefin moiety. Upon the addition of cysteine, a remarkable fluorescence enhancement (200 fold) was observed for probe 1 accompanied with a slight blue shift from 457 nm to 459 nm. The prepared probe displays high selectivity and sensitivity towards cysteine over other amino acids. The Michael addition of cysteine to probe 1 was confirmed by 1H-NMR spectroscopy. The detection limit of probe 1 towards cysteine was found to be 1.63 …

Go to article

Numerical Simulations Of A Delay Model For Immune System-Tumor Interaction, Mohamed A. Hajji, Qasem Al-Mdallal Apr 2025

Numerical Simulations Of A Delay Model For Immune System-Tumor Interaction, Mohamed A. Hajji, Qasem Al-Mdallal

Sultan Qaboos University Journal For Science

In this paper we consider a system of delay differential equations as a model for the dynamics of tumor-immune system interaction. We carry out a stability analysis of the proposed model. In particular, we show that the system can have up to two steady states: the tumor free steady state, which always exist, and the tumor persistent steady state, which exists only when the relative rate of increase of the tumor cells exceeds the ratio between the natural proliferation rate and the relative death rate of the effector cells. We also determine an upper bound for the delay, such that …

Go to article

Heat Transfer In Fe3o4-H2o Nanofluid Contained In A Triangular Cavity Under A Sloping Magnetic Field, Mohammad M.Rahman Apr 2025

Heat Transfer In Fe3o4-H2o Nanofluid Contained In A Triangular Cavity Under A Sloping Magnetic Field, Mohammad M.Rahman

Sultan Qaboos University Journal For Science

Numerical simulation is performed to explore the convective heat transfer characteristics of Fe3O4-H2O nanofluid contained in a right-angle triangular cavity considering three types of thermal boundary conditions at the bottom wall. No heat is allowed to escape through the insulated vertical wall, whereas the inclined wall is kept colder than the bottom one. A sloping magnetic field whose strength is unvarying acts upon the cavity. The physical model is converted to the mathematical form through coupled highly nonlinear partial differential equations. These equations are then transformed into the non-dimensional form with the help of a group of transformations of variables. …

Go to article

Development Of A Mathematical Model For Simulation Of Macroalgae Farming In The Coastal Areas, Abdolmajid Lababpour Apr 2025

Development Of A Mathematical Model For Simulation Of Macroalgae Farming In The Coastal Areas, Abdolmajid Lababpour

Sultan Qaboos University Journal For Science

A mathematical model consisting of a system of three coupled partial differential equations (PDEs) was proposed to estimate the concentrations of nitrogen, phosphorous and macroalgae biomass in coastal open waters. However, some simplifying assumptions were used in the model to cope with the complexity of real conditions. For the macroalgae biomass, the system works as a batch mode, while input and output were accounted for nitrogen and phosphorous. The MATLAB pdepe feature, applying the finite element method was used in model solving and the simulation of model equations. The program was split into four functions that included the solver and …

Go to article

Luminol Chemiluminescence Catalyzed By Silver Nanoparticles For The Sensitive Determination Of Penicillamine, Fakhr Eldin O. Suliman, Kauther Al-Hadhrami Apr 2025

Luminol Chemiluminescence Catalyzed By Silver Nanoparticles For The Sensitive Determination Of Penicillamine, Fakhr Eldin O. Suliman, Kauther Al-Hadhrami

Sultan Qaboos University Journal For Science

A sequential injection method for the determination of penicillamine (PA) was developed based on quenching the chemiluminescence generated by oxidation of luminol by hydrogen peroxide in presence of silver nanoparticles (AgNPs). The chemiluminescence (CL) of the reaction was found to greatly enhance in presence of AgNPs due to the increased catalyst surface area. The method was sensitive and found suitable for analysis of penicillamine in pharmaceutical preparations. Linear calibration curve is obtained in the range 0.2-1.0 mg mL-1 with a relative standard deviation less than 2%. A recovery percent of 102.3 ±0.2 was obtained with the tablets matrix indicating reasonable …

Go to article

Composition Of Solid Waste In Al Jabal Al Akhdar, A Mountain Region Undergoing Rapid Urbanization In Northern Oman, Abdullah I. Al-Mahrouqi, Reginald Victor Apr 2025

Composition Of Solid Waste In Al Jabal Al Akhdar, A Mountain Region Undergoing Rapid Urbanization In Northern Oman, Abdullah I. Al-Mahrouqi, Reginald Victor

Sultan Qaboos University Journal For Science

There is a lack of data on the generation and composition of waste in rural areas worldwide. The present study analyzed the composition of solid waste in Al Jabal Al Akhdar, a rural mountain region in the Sultanate of Oman, which is presently experiencing a rapid rate of urbanization due to tourism development. The solid wastes here are generated by the municipality collecting waste from residential, commercial, institutional and recreational areas, the military from a training camp and a few non-governmental private companies from their camps and hotels. The whole load from each of the three sources was manually segregated …

Go to article

Morphometry Of Organs In Sheep Fed A Diet Containing Tannins And Polyphenols, Osman Mahgoub, Ibrahim Inwa, Isam T. Kadim, Mohamed H. Tageldin, Kaadhia Al-Kharousi Apr 2025

Morphometry Of Organs In Sheep Fed A Diet Containing Tannins And Polyphenols, Osman Mahgoub, Ibrahim Inwa, Isam T. Kadim, Mohamed H. Tageldin, Kaadhia Al-Kharousi

Sultan Qaboos University Journal For Science

The aim of this study was to use morphometry to investigate the essential organs of sheep fed with non-conventional diets. Twelve male Omani sheep were fed with one of two types of roughages supplemented with a commercial concentrate for 63 days and then slaughtered. The volumes of their kidneys, testes, and livers were measured. Random samples from the organs were fixed in formalin and embedded in paraffin. Random five micrometer sections from each block were stained with hematoxylin and eosin. Images from four random fields were taken from each slide using a digital camera attached to the microscope and then …

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

Effect Of Nano Sb2o3 On The Dispersive Optical Constants Of Pmma Films, Wasan A. Al-Taa'y, Mohammed T. Abdul Nabi, Saad F. Oboudi, Emad Yousif Apr 2025

Effect Of Nano Sb2o3 On The Dispersive Optical Constants Of Pmma Films, Wasan A. Al-Taa'y, Mohammed T. Abdul Nabi, Saad F. Oboudi, Emad Yousif

Sultan Qaboos University Journal For Science

Pure and Antimony Trioxide Sb2O3 doped PMMA films were prepared by the casting method. Optical absorption measurements in the wavelength range 200-800 nm were studied by using a computerized UV-Vis spectrophotometer (Shimadzu UV-1601 PC) and these confirmed that PMMA films have a direct band gap that decreases from 5.15 to 4.66 eV as the doping concentration increases to 5wt%. The increase in the density of localized states from 8.9 to 74.5 meV causes an expansion in the Urbach tail and consequently decreases the energy gap. The dispersion of the refractive index was analyzed using the concept of a single oscillator. …

Go to article

Computational Study Of Geometry, Solvation Free Energy, Dipole Moment, Polarizability, Hyperpolarizability And Molecular Properties Of 2-Methylimidazole, Mohammad Firoz Khan, Ridwan Bin Rashid, Shahidul M. Islam, Mohammad A. Rashid Apr 2025

Computational Study Of Geometry, Solvation Free Energy, Dipole Moment, Polarizability, Hyperpolarizability And Molecular Properties Of 2-Methylimidazole, Mohammad Firoz Khan, Ridwan Bin Rashid, Shahidul M. Islam, Mohammad A. Rashid

Sultan Qaboos University Journal For Science

Ab initio calculations were carried out to study the geometry, solvation free energy, dipole moment, molecular electrostatic potential (MESP), Mulliken and Natural charge distribution, polarizability, hyperpolarizability, Natural Bond Orbital (NBO) energetic and different molecular properties like global reactivity descriptors (chemical hardness, softness, chemical potential, electronegativity, electrophilicity index) of 2-methylimidazole. B3LYP/6-31G(d,p) level of theory was used to optimize the structure both in the gas phase and in solution. The solvation free energy, dipole moment and molecular properties were calculated by applying the Solvation Model on Density (SMD) in four solvent systems, namely water, dimethylsulfoxide (DMSO), n-octanol and chloroform. The computed bond …

Go to article

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 …

Go to article

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 …

Go to article

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 …

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

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 …

Go to article

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.

Go to article

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. …

Go to article

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.

Go to article

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 …

Go to article

First Prev Next Last