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 208021 - 208050 of 5207130

Full-Text Articles in Entire DC Network

Production And Optimization Of Extracellular Α-Amylase From Halophilic Bacteria Cytobacillus Oceanisediminis Isolated From Wadi-El-Natrun, Egypt, Nada A. Hashem, Naeima M.H. Yousef Apr 2025

Production And Optimization Of Extracellular Α-Amylase From Halophilic Bacteria Cytobacillus Oceanisediminis Isolated From Wadi-El-Natrun, Egypt, Nada A. Hashem, Naeima M.H. Yousef

Sultan Qaboos University Journal For Science

The current study aimed to maximize α-amylase enzyme production by halophilic bacteria Cytobacillus oceanisediminis isolated from soil of Wadi-El-Natrun, Egypt. The results showed that of 21 halophilic bacterial isolates recovered from saline soil samples, eight isolates were high amylase producers. Interestingly, the bacterial isolate AHB6 exhibited the highest extracellular amylase production and was selected for further studies. This isolate was molecularly identified based on the 16srRNA gene sequencing as Cytobacillus oceanisediminis and has the accession number OM759999. The optimum temperature for α-amylase enzyme was 45 °C and exhibited thermostability at 45 °C for 1 h and retained more than 80% …

Go to article

Lithostratigraphy And Microfacies Of The Upper Cretaceous Muti Formation Of The Oman Foreland Basin, Nakhal Area, Oman, Jenan Ahmed Attar, Iftikhar Ahmed Abbasi, Muhammad Hanif, Mohamed A.K. El-Ghali, Abdulrazaq Al-Sayigh, Abdul Rahman Al-Harthi Apr 2025

Lithostratigraphy And Microfacies Of The Upper Cretaceous Muti Formation Of The Oman Foreland Basin, Nakhal Area, Oman, Jenan Ahmed Attar, Iftikhar Ahmed Abbasi, Muhammad Hanif, Mohamed A.K. El-Ghali, Abdulrazaq Al-Sayigh, Abdul Rahman Al-Harthi

Sultan Qaboos University Journal For Science

The Upper Cretaceous Muti Formation was deposited in the Oman Foreland Basin during the obduction of the allochthonous units on the eastern margin of the Arabian Platform. The formation is exposed in various isolated outcrops around Jabal Akhdar Mountain and is located between the Mesozoic platform carbonates below and the allochthonous nappe above. The current study is the first to describe the outcrops of the Muti Formation in the Nakhal area. It focuses on the lithofacies, microfacies distribution, and the characterization of the depositional environment of the formation. The lithofacies and microfacies of the formation are described from two measured …

Go to article

In-Situ Location Of Precious Stones Using Magnetic Data And Pseudo-Gravity Transforms In Parts Of The Nupe Basin Area Of Nigeria, Olawuyi A.K Apr 2025

In-Situ Location Of Precious Stones Using Magnetic Data And Pseudo-Gravity Transforms In Parts Of The Nupe Basin Area Of Nigeria, Olawuyi A.K

Sultan Qaboos University Journal For Science

In-situ location of precious stones from the mineral-rich zones in parts of Lafiagi (Sheet 203) and Pategi (Sheet 204) areas of Bida basin, central Nigeria was carried out. It was aimed at identification of the structures that usually host precious stones and then locating them in these areas. This work involved the qualitative and quantitative analysis of aeromagnetic data and pseudo-gravity transforms using the 3-D Euler Deconvolution subroutine of Oasis MontajTM software and the geological information obtained from reliable sources in the structural interpretation and isolation work. The geological features in the studied region have been connected to the presence …

Go to article

Preliminary Evidence For The Decline In Discharge At Falaj Daris, Nizwa, Oman, Ziyana Al-Rawahi, Paul R. Houser Apr 2025

Preliminary Evidence For The Decline In Discharge At Falaj Daris, Nizwa, Oman, Ziyana Al-Rawahi, Paul R. Houser

Sultan Qaboos University Journal For Science

Falaj Daris is one of the oldest active aflāj located in Oman and the largest in the Dakhiliyah governorate. It is a 7,999-meter long Dāwūdī-type falaj. Ninety-five percent of water drawn from falaj Daris is used for agricultural irrigation and the remaining five percent is used for domestic purposes. In this paper, we analyzed several datasets including falaj Daris discharge, borehole water levels in wadi al-Abyadh, whose aquifer falaj Daris taps, and GRACE satellite data to determine the historical trend of falaj Daris discharge during 1982-2020. A set of standard statistical methods and data visualization techniques were applied including the …

Go to article

Supercontinuum Generation By Controlling Pitch In Photonic Crystal Fibers, Mohammed Salim Jasim Al-Taie Apr 2025

Supercontinuum Generation By Controlling Pitch In Photonic Crystal Fibers, Mohammed Salim Jasim Al-Taie

Sultan Qaboos University Journal For Science

The influence of varying the distance between air holes (pitch) on the geography of solitone propagation through a photonic crystal fiber has been tested. The study depends on the Split-Step Fourier method and the results quantified using MATLAB. The first-order solitone was tested with the change in pitch, and it was found that there is a clear decay in the amplitude of the resulting pulse with an increase in pitch. When increasing the pitch in the case of second-order solitons, it was noticed that the pulse would split into multiple-order solitons down to higher-order solitons with the increase in pitch. …

Go to article

The Intended Blessed Tree In The Quran - Is It Olive Tree Or Palm Oil Tree?, Mostafa Koutb Apr 2025

The Intended Blessed Tree In The Quran - Is It Olive Tree Or Palm Oil Tree?, Mostafa Koutb

Sultan Qaboos University Journal For Science

This article aims to provide an alternative scientific interpretation for verse 35 in Surat An-Nur. This verse addresses the very famous simile in the Quran which describes the light of Allah. In this verse Allah mentioned that ꞌAllah (is the) light (of) the heavens and the earth. (The) example (of) His Light (is) like a niche in it (is) a lamp; the lamp (is) in a glass, the glass as if it were a star brilliant (which) is lit from a tree blessed - an olive, not (of the) east and not (of the) west, would almost its oil glow, …

Go to article

Impact Of Climate Change On Rare Species In Arid Environments, Hamada Ali, S:24:"Sultan Qaboos University", } N/A Apr 2025

Impact Of Climate Change On Rare Species In Arid Environments, Hamada Ali, S:24:"Sultan Qaboos University", } N/A

Sultan Qaboos University Journal For Science

Climate Change discusses the long-term metrological conditions and patterns. Besides nature, human development has drastically increased the chances of climate change by burning fossil fuels, including oil, gas, and coal. That resulted in turbulence among humans and plants, and animals. This vulnerability or changing climate dynamics has impacted the plants that are the earth's primary source of life. Egypt is one of the countries where the temperature has risen in the past decades due to climate change. In this country, the plants are affected by the vulnerability of this dynamic change of climate, especially the rare plant species. One of …

Go to article

An Efficient Sensor Based On Anodic Activation Of Graphene Oxide For Sensitive And Selective Determination Of Dopamine In Blood Serum, Emad Aldeen Khudaish, Lamiya Al Ghafri, Nusiba Al Hatmi, Salah Joudi Apr 2025

An Efficient Sensor Based On Anodic Activation Of Graphene Oxide For Sensitive And Selective Determination Of Dopamine In Blood Serum, Emad Aldeen Khudaish, Lamiya Al Ghafri, Nusiba Al Hatmi, Salah Joudi

Sultan Qaboos University Journal For Science

A native graphene oxide (NGO) prepared by Hummers modified method was used as the template materials for the fabrication of electrochemically oxidative graphene oxide (OGO) onto a glassy carbon electrode (GCE). The fabrication of OGO-GCE persuaded via anodic reversible potentiodynamic of NGO base surface materials that increases the concentration of oxygen functionalities. The development of a new aldehyde/alcoholic functional group on OGO-GCE characterized by XPS analysis is a marked signal for oxygen richness surface which provoked on the cost of sp2 hybridized function. The EIS data underline that OGO-GCE promote the electron transfer kinetics much more than NGO-GCE by 9 …

Go to article

Preparation And Characterization Of Iron Oxide Nano-Adsorbent By Enteromorpha Flexuosa Algae Obtained From Yanbu Red Sea, Saudi Arabia, Prof. Imran Ali, Alaa Elmi, Rafat Afifi Khattab, Omar M.L. Alharbi, Gunel Imanova Apr 2025

Preparation And Characterization Of Iron Oxide Nano-Adsorbent By Enteromorpha Flexuosa Algae Obtained From Yanbu Red Sea, Saudi Arabia, Prof. Imran Ali, Alaa Elmi, Rafat Afifi Khattab, Omar M.L. Alharbi, Gunel Imanova

Sultan Qaboos University Journal For Science

Water contamination caused by toxic cadmium metal ions is a worldwide problem. There is a need to explore new methods of cadmium removal from water. The green algae Enteromorpha flexuosa, obtained from the Red Sea in Yanbu, Saudi Arabia, was used to prepare iron nanoparticles. TEM, FT-IR, XRD, and SEM techniques were used to characterize the prepared nanoparticles. The prepared nanoparticle's surface was rough, with nanoparticle sizes ranging from 10 to 50 nm. The developed nanoparticles were used to adsorb cadmium ions from water in batch mode. With a 25.0 µg/L concentration, a temperature of 25˚C, 7.0 pH, 60 minutes …

Go to article

Knowledge And Attitude Towards Covid-19 And Associated Mental Health Status Among Students Of Sultan Qaboos University, Oman, M Mazharul Islam, Ronald Wesonga, Iman Al Hasani, Afra Al Manei Apr 2025

Knowledge And Attitude Towards Covid-19 And Associated Mental Health Status Among Students Of Sultan Qaboos University, Oman, M Mazharul Islam, Ronald Wesonga, Iman Al Hasani, Afra Al Manei

Sultan Qaboos University Journal For Science

This study examined the COVID-19-related knowledge and attitude towards COVID-19 and associated mental health status during COVID-19 among the students of Sultan Qaboos University in Oman using an online cross-sectional survey conducted from 26 March - 25 April 2021 among the students of Sultan Qaboos University (SQU). Both descriptive and inferential statistical techniques, including multiple logistic regression analysis, were used for data analysis. Of the 1,951 respondents, 60% were females with a mean age of 22 years. About 13% were tested COVID-19 positive and 3.6% were tested positive. Overall, students demonstrated a high level (81%) of knowledge and a positive …

Go to article

Analysis Of Fractional Linear Multi-Step Methods Of Order Four From Super-Convergence, Haniffa Mohamed Nasir, Khadija Al Hasani Apr 2025

Analysis Of Fractional Linear Multi-Step Methods Of Order Four From Super-Convergence, Haniffa Mohamed Nasir, Khadija Al Hasani

Sultan Qaboos University Journal For Science

We analyze two implicit fractional linear multi-step methods of order four for solving fractional initial value problems. The methods are derived from the Grunwald-Letnikov approximation of fractional derivative at a non-integer shift point with super-convergence. The weight coefficients of the methods are computed from fundamental G unwald weights, making them computationally efficient when compared with other known methods of order four. We also show that the stability regions are larger than that of the fractional Adams-Moulton and fractional backward difference formula methods. We present numerical results and illustrations to verify that the theoretical results obtained are indeed satisfied.

Go to article

Toxicological Evaluation Of The Leaves Of Mangifera Indica L. (Mango) On Albino Rats (Rattus Norvegicus), Tajudeen, O.Y, Titilola F. Salisu, Esther O. Oladele, 4department Of Animal And Environmental Biology, University Of Uyo, Akwa Ibom State, Nigeria, Clement Yaro, Nura Iliyazu, Adam Tukur, Abdulrazaq Izuafa, Muhammad A. Yari Apr 2025

Toxicological Evaluation Of The Leaves Of Mangifera Indica L. (Mango) On Albino Rats (Rattus Norvegicus), Tajudeen, O.Y, Titilola F. Salisu, Esther O. Oladele, 4department Of Animal And Environmental Biology, University Of Uyo, Akwa Ibom State, Nigeria, Clement Yaro, Nura Iliyazu, Adam Tukur, Abdulrazaq Izuafa, Muhammad A. Yari

Sultan Qaboos University Journal For Science

The increasing use of plant-based medicines necessitates safety evaluations of all medicinal plants. This study evaluated the effects of mango (Mangifera indica) leaf extracts on albino rats (Rattus norvegicus). The phytochemistry of the plant’s extract was evaluated, followed by a determination of its acute toxicity using 24 rats. Thereafter, the chronic toxicity of the extract was determined using another set of 24 rats, separated into four groups of six rats each. Rats in group 1 (the control) were administered distilled water, while groups 2, 3, and 4 received daily doses of 1000, 2000, and 3000 mg kg-1 body weight, respectively. …

Go to article

Haematological And Biochemical Changes In Albino Rats In Response To Bisphenol A (Bpa) Exposure, Enwongo Effiong Nduonofit, Obemeata Emmanuel Oriakpono Apr 2025

Haematological And Biochemical Changes In Albino Rats In Response To Bisphenol A (Bpa) Exposure, Enwongo Effiong Nduonofit, Obemeata Emmanuel Oriakpono

Sultan Qaboos University Journal For Science

The aim of this study was to investigate the haematological and biochemical alterations in albino rats induced by bisphenol A (BPA). Fifteen adult male albino rats were procured and separated into 3 different groups viz: group 1 (control), group 2 (50 mg/kg), group 3 (250 mg/kg); and were orally administered BPA at doses of 50 and 250 mg/kg/week. After 6 weeks of exposure, blood samples were collected for haematological and biochemical assay. The parameters analyzed included: red blood cell count, haemoglobin concentration, packed cell volume, white blood cell count, differential white blood cell count, kidney and liver function tests. The …

Go to article

Comparative Study On The Phytochemical, Antistaphylococcal And Antioxidant Properties Of The Stem Bark Of Jatropha Curcas L And Jatropha Gossypifolia L, Oyetayo, V.O, Temenu, O.E Apr 2025

Comparative Study On The Phytochemical, Antistaphylococcal And Antioxidant Properties Of The Stem Bark Of Jatropha Curcas L And Jatropha Gossypifolia L, Oyetayo, V.O, Temenu, O.E

Sultan Qaboos University Journal For Science

This study was conducted to assess the phytochemical, antistaphylococcal and antioxidant properties of the leaf and stem bark of Jatropha curcas and Jatropha gossypifolia. Ethanolic extract of the leaf and stem bark of Jatropha curcas and Jatropha gossypifolia was obtained using standard methods. Qualitative and quantitative phytochemical properties of theJatropha plant was assessed using standard methods. Antistaphylococcal and minimum inhibitory concentration of the extracts were assessed against Staphylococcal aureus obtained from different sources using agar diffusion method. Ferrous ion and hydroxyl radical scavenging activity of the extracts were also determined using standard methods. Quantitative phytochemical screening revealed that the distribution …

Go to article

Adsorption Of Methylene Blue Onto Hydrophobic Activated Carbon, El-Said Ibrahim El-Shafey, Said M. Al-Mashaikhi Apr 2025

Adsorption Of Methylene Blue Onto Hydrophobic Activated Carbon, El-Said Ibrahim El-Shafey, Said M. Al-Mashaikhi

Sultan Qaboos University Journal For Science

Activated carbon (AC) was prepared from date palm leaflets using NaOH activation. AC was oxidized using concentrated HNO3 to produce oxidized activated carbon (ON). Alkylamines including methylamine (M), dimethylamine (DM), ethylamine (E), diethylamine (DE), and diisopropylamine (DIP) were covalently immobilized onto ON to produce ONM, ONDM, ONE, ONDE, and ONDIP hydrophobic activated carbons, respectively. The surface area of AC (588 m2/g) decreased on oxidation with a further decrease on functionalization. These carbons were tested for methylene blue (MB) adsorption. Initial pH 7 was found optimum for the adsorption of MB. The hydrophobic activated carbons show faster adsorption (except for ONDE), …

Go to article

Geological Complications And Environmental Hazards Of The Cement Raw Materials Quarry Sites In Yemen, Ahmed M. Al-Anweh, Mohammed Ibrahim El-Anbaawy, Mohamed Mahmmoud Abu-Zeid, Ibrahim Al-Akhaly, S:17:"Sana'a University", } N/A Apr 2025

Geological Complications And Environmental Hazards Of The Cement Raw Materials Quarry Sites In Yemen, Ahmed M. Al-Anweh, Mohammed Ibrahim El-Anbaawy, Mohamed Mahmmoud Abu-Zeid, Ibrahim Al-Akhaly, S:17:"Sana'a University", } N/A

Sultan Qaboos University Journal For Science

Extensive field and site investigations were conducted to assess and evaluate the situation in the presently exploited quarries of cement raw materials in Yemen. These quarries have several geological complications represented mainly by high elevations, steep slopes, rugged topography, heterogeneity in bed thickness, lithologic composition and quality, presence of igneous sills and dykes, intensive fracturing and jointing and abundance of karstification features. Moreover, the processes of quarrying and related operations have several negative environmental impacts the most important of which are soil failure, overburden and land sliding, toppling and rock falls (which result in considerable mass wasting) and emission of …

Go to article

Role Of Nanotechnology In Diagnosing, Safeguarding, And Treating Covid-19, Rohini M. De Silvaa, Kenneth Hulugallaa, Panchali Ranasinghe, Gareth R. Williams, K.M. Nalin De Silva Apr 2025

Role Of Nanotechnology In Diagnosing, Safeguarding, And Treating Covid-19, Rohini M. De Silvaa, Kenneth Hulugallaa, Panchali Ranasinghe, Gareth R. Williams, K.M. Nalin De Silva

Sultan Qaboos University Journal For Science

Coronavirus disease (COVID-19) is arguably the worst health crisis the world has faced in the 21st century, and the World Health Organization declared this a “public health emergency of international concern” during the beginning of the pandemic and continued for a significant period of time. Considering the public health risk and the delay in introducing a suitable medical intervention to eradicate this virus, many reserachers embarked on different technologies to develop a cure. Nanotechnology has emerged as a promising weapon in the fight against COVID-19 and other similar viral diseases. The unique qualities of nanomaterials make them excellent for a …

Go to article

Optimization Of Independent Variables For The Production Of Extracellular Alpha Amylase By Bacillus Subtilis Imd34 Using Plackett-Burman Design, Henshaw Effiom, Josiah Lennox Apr 2025

Optimization Of Independent Variables For The Production Of Extracellular Alpha Amylase By Bacillus Subtilis Imd34 Using Plackett-Burman Design, Henshaw Effiom, Josiah Lennox

Sultan Qaboos University Journal For Science

Bacillus species are widely used for thermostable α-amylase production for various applications such as in the detergent and food industries. This research aimed to study the production of α-amylase by B. subtilis IMD34 in submerged fermentation conditions using Plackett-Burman (PB) design, along with the optimization of certain environmental factors for optimal growth of amylolytic bacteria. Plackett-Burman design was used to evaluate the effect of ten independent variables on α-amylase production. Maximum enzyme activity was recorded in a medium containing (g/l); starch (6.0), peptone (12.0), K2HPO4 (1.0), Na2HPO4 (2.0), NaCl (0.6), Na2SO4 (0.1), MgSO4.7H20 (1.0), FeCl3.6H2O (0.02), CaCl2.2H2O (0.02) and with …

Go to article

Prevalence Of Gastrointestinal Helminthes In Pigs Reared In Research Farms Of Michael Okpara University Of Agriculture, Umudike, South Eastern Nigeria, Ebube Charles Amaechi, Miracle Innocent Dike, Onyinye Mkpola Ukpai, Blessing Uzoamaka Ejike Apr 2025

Prevalence Of Gastrointestinal Helminthes In Pigs Reared In Research Farms Of Michael Okpara University Of Agriculture, Umudike, South Eastern Nigeria, Ebube Charles Amaechi, Miracle Innocent Dike, Onyinye Mkpola Ukpai, Blessing Uzoamaka Ejike

Sultan Qaboos University Journal For Science

Gastrointestinal parasitism in swine production is a world-wide problem especially in tropical resource-poor countries. These infections in animals result in significant economic losses. This study aimed to assess the prevalence and spectrum of gastrointestinal parasites of pigs reared in two research farms in Michael Okpara University of Agriculture, Umudike, South eastern Nigeria. From April, 2016 to July, 2016, 220 samples of pig faeces from two research farms (CASAP Research Farm and MOUAU Commercial Pig Farm) were analyzed using floatation and direct smear methods to identify varied parasitic stages present in the faeces. Data generated showed an overall prevalence of 64.6% …

Go to article

Analysis Of New Type Of Second-Order Fractional Linear Multi-Step Method With Improved Stability, H.M. Nasir Apr 2025

Analysis Of New Type Of Second-Order Fractional Linear Multi-Step Method With Improved Stability, H.M. Nasir

Sultan Qaboos University Journal For Science

We present and investigate a new type of implicit fractional linear multi-step method of order two for fractional initial value problems. The method is obtained from the second-order superconvergence of the Grünwald-Letnikov approximation of the fractional derivative at a non-integer shift point. The method coincides with the backward difference method of order two for the classical initial value problem when the order of the derivative is one. The weight coefficients of the proposed method are obtained from the Grünwald weights and are hence computationally efficient compared with that of the fractional backward difference formula of order two. The stability properties …

Go to article

Solving Unconstrained Optimization Problems By A New Conjugate Gradient Method With Sufficient Descent Property, Farzad Rahpeymaii, Majid Rostami Apr 2025

Solving Unconstrained Optimization Problems By A New Conjugate Gradient Method With Sufficient Descent Property, Farzad Rahpeymaii, Majid Rostami

Sultan Qaboos University Journal For Science

There have been some conjugate gradient methods with strong convergence but numerical instability and conversely‎. Improving these methods is an interesting idea to produce new methods with both strong convergence and‎‏ ‎numerical stability‎. ‎In this paper‎, ‎a new hybrid conjugate gradient method is introduced based on the Fletcher ‎formula (CD) with strong convergence and the Liu and Storey formula (LS) with good numerical results‎. ‎New directions satisfy the sufficient descent property‎, ‎independent of line search‎. ‎Under some mild assumptions‎, ‎the global convergence of new hybrid method is proved‎. ‎Numerical results on unconstrained CUTEst test problems show that the new algorithm …

Go to article

Topo-Groups And Atychonoff Type Theorem, Mohammad Shahryari Apr 2025

Topo-Groups And Atychonoff Type Theorem, Mohammad Shahryari

Sultan Qaboos University Journal For Science

We define a topo-system on a group as a set of subgroups satisfying certain topology-like conditions. We study some fundamental properties of groups equipped with a topo-system (topo-groups) and using a suitable formalization of a subgroup filter, we prove a Tychonoff type theorem for the direct product of topo-compact topo-groups.

Go to article

Optical Properties Of Photonic Crystal Fibers With Fluid Cores, Mohammed Salim Jasim Al-Taie Apr 2025

Optical Properties Of Photonic Crystal Fibers With Fluid Cores, Mohammed Salim Jasim Al-Taie

Sultan Qaboos University Journal For Science

The objective of this research is to compare pulses travelling through different photonic crystal fiber cores (DPCFC) using both finite element method (FEM) /split step Fourier method (SSFM). A unique DCPCF design with exceptionally high non-linearity has been introduced to achieve ultra-high pulse amplitude. Via a generalized non-linear equation, we evaluate the refractive index ratio and dispersion, for each type which is used, as well as output amplitude for different cores in different photonic crystal fiber core by utilizing the solution for the nonlinear Schrodinger equation (NLSE). Lastly, the findings are compared to different photonic crystal fiber design parameters. This …

Go to article

Archaeo-Geophysical Investigation Of Simulated Settlement: Case Study In A Part Of Basement Complex Of Nigeria, Saminu Olatunji, Isaac Onimisi Lawal Apr 2025

Archaeo-Geophysical Investigation Of Simulated Settlement: Case Study In A Part Of Basement Complex Of Nigeria, Saminu Olatunji, Isaac Onimisi Lawal

Sultan Qaboos University Journal For Science

We have used the 2D Vertical Electrical Sounding method and Electrical Resistivity Tomography (ERT) method to map buried artifacts in a simulated settlement, and have shown how the geographical information system could aid future research. Stones, bones, metals, cement bricks, and cement-and-sand mixtures were locally constructed to fit into an African-archaeological setting. Parameters such as the materials’ composition, width, electrical resistivity, height, age, and depth of burial were taken into account before this investigation. The integrated methods employed collected data over the study area along with a pre-calculated dense network of parallel profiles. A total of eight (8) VES points …

Go to article

Negligence Of Geological Investigations Site Leading To Slope Failure Incidents: A Case Study From Saih Al Ahmar In Bidbid, Northern Oman, Talal Al-Hosni, Sobhi Nasir Apr 2025

Negligence Of Geological Investigations Site Leading To Slope Failure Incidents: A Case Study From Saih Al Ahmar In Bidbid, Northern Oman, Talal Al-Hosni, Sobhi Nasir

Sultan Qaboos University Journal For Science

This paper describes and analyzes a recent slope failure alongside Saih Al Ahmar water storage tank in Bidbid, and identifies the natural and induced causes of the landslide. Our analysis demonstrates that the landslide in Bidbid was the result of several combined factors: slope-forming materials, distribution of geological discontinuities and disturbance by human activities. Moreover, field observations, satellite imagery and geology of the study area indicate that the major factors which caused the landslide are the steep slope excavation along the developed tensional faults, the material in the slide ranging from talus deposits to interlayered peridotite and gabbro, cutting perpendicular …

Go to article

Determination And Comparison Of Co2 And Air Pollutants Emitted From The Exhaust Gas Of Selected Electric Generators, Obemeata E. Oriakpono, P. M. B. 5323, Port Harcourt, Rivers State, Uchenna Christian Ohabuike Apr 2025

Determination And Comparison Of Co2 And Air Pollutants Emitted From The Exhaust Gas Of Selected Electric Generators, Obemeata E. Oriakpono, P. M. B. 5323, Port Harcourt, Rivers State, Uchenna Christian Ohabuike

Sultan Qaboos University Journal For Science

The study is aimed at providing information on the composition of the exhaust gas and concentration of air pollutants that are generated by different commonly used electricity generators in an average Nigerian household. The generators used for this study were a 0.7 kVA petrol engine, a 2.5 kVA petrol engine and an 8.8 kVA diesel engine. The gases include: CO2, CO, SO2, NO2, NO, O3, Total Volatile Organic Compounds (TVOC), Total Suspended Particles (TSP) and respirable and inhalable particulates (PM2.5 and PM10). The mean concentrations of the air pollutants measured for 0.7, 2.5 and 8.8 kVA generators respectively were as …

Go to article

Development And Validation Of An Rp-Hplc-Fld Method For The Determination Of Biogenic Amines After Pre-Column Derivatization With A New Pyrazoline Based Reagent, 3- Naphthyl-1-(4-Trifluoromethyl)-5-(4-Carboxy Phenyl)-2-Pyrazoline, Salma Mohamed Al-Kindy, Amal Al Sabahi, Saleh Al-Busafi, Beena Varghese, Fakhreldin Osman Suliman Apr 2025

Development And Validation Of An Rp-Hplc-Fld Method For The Determination Of Biogenic Amines After Pre-Column Derivatization With A New Pyrazoline Based Reagent, 3- Naphthyl-1-(4-Trifluoromethyl)-5-(4-Carboxy Phenyl)-2-Pyrazoline, Salma Mohamed Al-Kindy, Amal Al Sabahi, Saleh Al-Busafi, Beena Varghese, Fakhreldin Osman Suliman

Sultan Qaboos University Journal For Science

Application of 3-Naphthyl-1-(4-trifluoromethyl)-5-(4-carboxy phenyl)-2-pyrazoline (NFCP) as a novel fluorigenic label for the derivatization of biogenic amines (BAs) and separation by liquid chromatography (LC) was investigated. Optimum conditions for the pre-column derivatization and chromatographic separation were investigated. The resulting derivatives are fluorescent at λex/λem: 380/460 nm. For the sake of evaluating the efficacy of the proposed analysis of BAs of different nature, the formation of nine NFCP-BAs derivatives was tested individually. Simultaneous derivatization and separation of four BAs (histamine, tyramine, tryptamine, and phenylethylamine) were achieved under the isocratic elution mode. Furthermore, the derivatives were identified by the characteristic product ion obtained …

Go to article

Engineering Properties Of Umm Er Radhuma Limestone, Southeast Ataq, Yemen, Ibrahim A. Al-Akhaly, Abdelmonem M. Habtoor Apr 2025

Engineering Properties Of Umm Er Radhuma Limestone, Southeast Ataq, Yemen, Ibrahim A. Al-Akhaly, Abdelmonem M. Habtoor

Sultan Qaboos University Journal For Science

Limestone in southeast Ataq, Shabwah governorate in Yemen was studied to assess its engineering properties to ensure their compliance with the minimum construction requirements. This limestone is widely used as building stone in this area. Six different sites were selected for sampling appropriate limestone rock for building stone. 42 representative samples were collected and tested for water content, water absorption, dry density, saturated density, specific gravity, porosity, void ratio, and uniaxial compressive strength to ensure their suitability for use in the production of dimension stone. Tensile strength and elastic modulus were estimated. Their low water absorption, density and porosity values …

Go to article

A Compiled Synoptic Table Of The Standard Microfacies And Facies Zone System Of Flügel (2010): A Practical Tool, Frank Mattern Apr 2025

A Compiled Synoptic Table Of The Standard Microfacies And Facies Zone System Of Flügel (2010): A Practical Tool, Frank Mattern

Sultan Qaboos University Journal For Science

A synoptic table, compiling the most important information of Flügel’s (2010) [1] complex standard microfacies and facies zone system, is shared with the public. On one page, it contains all standard microfacies (SMF) types, all facies zones (FZ) and which SMFs are associated with which FZs. This table provides the user with a quick and convenient reference/overview, serving students and professionals as an effective teaching/learning and research tool.

Go to article

The Deubiquitylase Usp5 Knockdown Reduces Semliki Forest Virus Replication In Hela Cells, Amer Nubgan Apr 2025

The Deubiquitylase Usp5 Knockdown Reduces Semliki Forest Virus Replication In Hela Cells, Amer Nubgan

Sultan Qaboos University Journal For Science

Semliki Forest Virus (SFV), a member of the Alphavirus genus in the Togaviridae family, is a small-enveloped, positive-sense single-stranded RNA (+ssRNA) virus. The virus is spread by mosquitos and can infect humans, resulting in mild febrile disease with symptoms that include fever, myalgia, arthralgia, persistent headaches and asthenia. Virulent strains of SFV in mice cause lethal encephalitis by infecting neurons in the central nervous system. In on-going experiments in the research group using a focused siRNA screen we have investigated the role of deubiquitylases (DUBs) during SFV infection (as a model alphavirus) and monitored the effect of DUB depletion on …

Go to article

First Prev Next Last