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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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

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

Sultan Qaboos University Journal For Science

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

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Behaviour Of Thermal Degradation Of Some Poly (4-Amino-2,6-Pyrimidinodithiocarbonate) Metal Complexes, Hussein M. Al-Maydama, Ali El-Shekeil, Ashour Al-Karbouly Apr 2025

Behaviour Of Thermal Degradation Of Some Poly (4-Amino-2,6-Pyrimidinodithiocarbonate) Metal Complexes, Hussein M. Al-Maydama, Ali El-Shekeil, Ashour Al-Karbouly

Sultan Qaboos University Journal For Science

The thermal decomposition behaviour of the Fe(II), Co(II) and Ni(II) complexes of poly[4-amino-2,6-pyrimidinodithiocarbamate] has been investigated by thermogravimetric analysis (TGA) at a heating rate of 10°C min-1 under nitrogen. The Coats-Redfern integral method is used to evaluate the kinetic parameters for the successive steps in the decomposition sequence observed in the TGA curves. The processes of thermal decomposition taking place in the three complexes are studied comparatively as the TGA and DTA curves indicate the difference in the thermal decomposition behaviour. The thermal stabilities for the release of the fragments at the successive steps in the sequential decomposition of these …

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Stability And Persistence Of Synchronization In A System With A Diffusive-Time-Lag Coupling, Adu A.M. Wasike Apr 2025

Stability And Persistence Of Synchronization In A System With A Diffusive-Time-Lag Coupling, Adu A.M. Wasike

Sultan Qaboos University Journal For Science

We study synchronization in the framework of invariant manifold theory for systems with a time lag. Normal hyperbolicity and its persistence in infinite dimensional dynamical systems in Banach spaces is applied to give general results on synchronization and its stability.

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Action Plan For Monitoring, Mitigation And Management Of Harmful Algal Blooms In The Coastal Waters Of Oman, A.Y.A Alkindi, H.M.H. Al-Ghelani, S. Amer, Y.K Al-Akhzami Apr 2025

Action Plan For Monitoring, Mitigation And Management Of Harmful Algal Blooms In The Coastal Waters Of Oman, A.Y.A Alkindi, H.M.H. Al-Ghelani, S. Amer, Y.K Al-Akhzami

Sultan Qaboos University Journal For Science

The Gulf of Oman, an ecologically and economically rich ecosystem, is frequently impacted by occurrences of harmful algal blooms. Recent studies indicate an increase in the number of causative species and harmful impacts. Many red tide incidents in Oman have been found leading to hypoxia. The frequent bloom forming species here are Karenia selliformis, Nitzschia pungens, Prorocentrum arabianum and Trichodesmium erythraeum. We review work carried out in this area, and we propose here a Management Action Plan for not only an effective monitoring system for harmful algal blooms (HABs), but also mitigation of their adverse impacts and rapid response system.

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Application Of Neural Networks To Data Mining, Zlatinka Svetoslavova Kovacheva Apr 2025

Application Of Neural Networks To Data Mining, Zlatinka Svetoslavova Kovacheva

Sultan Qaboos University Journal For Science

Data Mining accomplishes nontrivial extraction of implicit, previously unknown, and potentially useful information of data. The aim of data mining is to discover knowledge out of data and present it in a form that is easily comprehensible to humans. Neural Networks are analytic techniques capable of predicting new observations from other observations after executing a process of so-called learning from existing data. Neural Network techniques can also be used as a component of analyses designed to build explanatory models. Now there is neural network software that uses sophisticated algorithms directly contributing to the model building process. The latest developments in …

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Screening Of Antioxidant And Radical Scavenging Activities Of Some Omani Medicinal Plants, Saleh Al-Busafi, Mubarak Al-Riyami, Khadija Al-Ouwaisi, Abdulkhader Hisham Apr 2025

Screening Of Antioxidant And Radical Scavenging Activities Of Some Omani Medicinal Plants, Saleh Al-Busafi, Mubarak Al-Riyami, Khadija Al-Ouwaisi, Abdulkhader Hisham

Sultan Qaboos University Journal For Science

n-Butanol extracts of nine medicinal plants, Cressa cretica, Ziziphus spina-christ, Acacia tortilis, Tephrosia haussknechti, Aristolochiae bracteolata, Citrullus colocynthis, Teucrium mascatense, Rhazya stricta and Nerium oleander, found in Oman were screened for their antioxidant activity using phosphomolybdenum complex assays and their radical scavenging activity using DPPH assays. Ocimumi basilicum, a plant with well documented antioxidant activity, was used as a reference. A. tortilis, and T. haussknechti extracts possessed very high antioxidant activity (AOA) and high radical scavenging activity (RSA).

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Two New Measures Of Fuzzy Divergence And Their Properties, Om Parkash, P.K. Sharma, Subhash Kumar Apr 2025

Two New Measures Of Fuzzy Divergence And Their Properties, Om Parkash, P.K. Sharma, Subhash Kumar

Sultan Qaboos University Journal For Science

Several measures of directed divergence and their corresponding measures of fuzzy divergence are available in the exiting literature. Two new measures of fuzzy divergence have been developed and their desirable properties have been discussed.

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Harmful Algal Blooms: Physiology, Behavior, Population Dynamics And Global Impacts- A Review, H.M. Al-Ghelani, A.Y.A Alkindi, S. Amer, Y.K Al-Akhzami Apr 2025

Harmful Algal Blooms: Physiology, Behavior, Population Dynamics And Global Impacts- A Review, H.M. Al-Ghelani, A.Y.A Alkindi, S. Amer, Y.K Al-Akhzami

Sultan Qaboos University Journal For Science

Harmful, toxic algae are now considered as one of the important players in the newly emerging environmental risk factors. The apparent global increase in harmful algal blooms (HABs) is becoming a serious problem in both aquaculture and fisheries populations. Not only has the magnitude and intensity of public health and economic impacts of these blooms increased in recent years, but the number of geographic locations experiencing toxic algal blooms has also increased dramatically. There are two primary factors causing HABs outbreaks. The natural processes such as upwelling and relaxation, and the anthropogenic loading resulting in eutrophication. However, the influence of …

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Circulating Hormone Levels In Hatchlings Of Green Turtle, Chelonia Mydas, From Ras Al-Hadd Reserve, Oman, A. Y. A. Alkindi Apr 2025

Circulating Hormone Levels In Hatchlings Of Green Turtle, Chelonia Mydas, From Ras Al-Hadd Reserve, Oman, A. Y. A. Alkindi

Sultan Qaboos University Journal For Science

Post-hatching levels of plasma estradiol (E2), Progesterone (Pro), testosterone (T), Luteinizing Hormone (LH), Follicle-Stimulating Hormone (FSH) and thyroxine (T4) were monitored in hatchlings of Green Turtle, Chelonia mydas immediately after emergence. Eggs were collected at random from 5 nests. The eggs were placed in incubators 16 hr after oviposition set at 26-27oC for male producing hatchlings and at 30-31oC for female producing hatchlings. Blood was collected after sacrifice. Chemiluminescence immunoassay was used for determination of plasma hormone levels, using Beckman Coulter Access-2-immunoassay and reagents (Beckman Coulter, Inc.). Sex was determined from histological examination of gonads. In males, plasma T levels …

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Effect Of Cumulus Cell Co-Culture And Protein Supplement On Success Of In Vitro Fertilization And Development Of Pre-Implanted Embryos In Mice, Muhammad-Baqir M-R. Fakhrildin, Institute For Embryo Research And Infertility Treatment, University Of Baghdad, Baghdad, Iraq Apr 2025

Effect Of Cumulus Cell Co-Culture And Protein Supplement On Success Of In Vitro Fertilization And Development Of Pre-Implanted Embryos In Mice, Muhammad-Baqir M-R. Fakhrildin, Institute For Embryo Research And Infertility Treatment, University Of Baghdad, Baghdad, Iraq

Sultan Qaboos University Journal For Science

Successful oocyte fertilization and normal embryonic development of mice were considered the most important diagnostic criteria for the safety of materials and tools used for human in vitro fertilization and embryo transfer (IVF-ET). Therefore, we studied the influence of cumulus cells co-culture and protein supplement within culture medium on percentages of in vitro fertilization (IVF) and normal development of early stages of mouse embryo later. Oocytes were collected and treated with hyaluronidase to remove cumulus cells. Oocytes were divided into four groups namely: Group-1: Oocytes incubated within modified Earl’s medium (MEM) supplied with 10% inactivated bovine amniotic fluid as a …

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