A Geomechanical Approach for Drilling Performance Optimization Across Shales in Safaniya Field—Arabian Gulf, Saudi Arabia

2017 ◽  
Author(s):  
Ziyad Alsahlawi ◽  
Herschel Foster ◽  
Mohamed Hussein
Keyword(s):  
Saudi Arabia ◽  
Performance Optimization ◽  
Arabian Gulf ◽  
Drilling Performance

A new microsporidian parasite, Heterosporis saurida n. sp. (Microsporidia) infecting the lizardfish, Saurida undosquamis from the Arabian Gulf, Saudi Arabia: ultrastructure and phylogeny

Parasitology ◽  
2012 ◽  
Vol 139 (4) ◽  
pp. 454-462 ◽  
Author(s):  
S. AL-QURAISHY ◽  
A. S. ABDEL-BAKI ◽  
H. AL-QAHTANI ◽  
M. DKHIL ◽  
G. CASAL ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Polar Filament ◽  
Phylogenetic Analyses ◽  
Abdominal Cavity ◽  
Arabian Gulf ◽  
Its Region ◽  
Rrna Genes ◽  
Microsporidian Parasite ◽  
Ultrastructural Characteristics ◽  
A New Species

SUMMARYA new microsporidian that infects the lizardfish Saurida undosquamis (Richardson, 1848) that are caught in the Arabian Gulf in Saudi Arabia is described here. This parasite invades the skeletal muscle of the abdominal cavity forming white, cyst-like structures containing numerous spores. The prevalence of the infection was 32·1% (135/420). The spores were oval to pyriform in shape and measured approximately 3·3 μm×2·0 μm. The developing spores were found within parasitophorous vacuoles. In mature spores, the polar filament was arranged into 5 coils in a row. Molecular analysis of the rRNA genes, including the ITS region, and phylogenetic analyses using maximum parsimony, maximum likelihood, and Bayesian inference were performed. The ultrastructural characteristics and phylogenetic analyses support the recognition of a new species, herein named Heterosporis saurida n. sp.

Monitoring metal levels in water and multiple biomarkers in the grouper (Epinephelus tauvina) to assess environmental stressors on the Arabian Gulf coast of Saudi Arabia

2018 ◽  
Vol 34 (5) ◽  
pp. 301-314
Author(s):  
Ashraf M Abdel-Moneim ◽  
Mohamed A Al-Kahtani ◽  
Omar M Elmenshawy ◽  
Hany Elsawy ◽  
Aly M Hafez ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Gulf Coast ◽  
Arabian Gulf ◽  
Environmental Stressors ◽  
Eastern Coast ◽  
Activity Levels ◽  
Hepatocellular Necrosis ◽  
Metal Levels ◽  
Multiple Biomarkers ◽  
Gill Lamellae

In this field study, the levels of heavy metals (Pb, Fe, Co, Cu, and Zn) in water and a suite of biochemical and histological biomarkers in the grouper ( Epinephelus tauvina) were assessed at four sites in the Arabian Gulf. Samples were taken from a relatively non-urban reference site, called Salwa (S1), and three effluent-dominated sites, namely Al-aziziyah in southern Dammam city (S2), the Al-Jubail coast (S3), and Manifa (S4). Toxic metals, namely Pb and Co (at all sites) and Fe (at S3), were elevated in water samples relative to the internationally permissible limits. In fish, induced levels of heat shock protein 70 (HSP70) in the liver at S3 and S4 were higher than those of the reference fish at S1. Additionally, the level of the lipid peroxidation (LPO) product (malondialdehyde (MDA)) was significantly increased in gills (at S3) and liver (at S2 and S3). There was an inhibition of catalase activities in the gills of fish from S2 to S4 and significantly higher activity levels of superoxide dismutase in the gills of fish from S4. Histopathological features such as aneurysms in gill vessels, deformed gill lamellae, increases in liver melano-macrophage centers, and hepatocellular necrosis were most abundant at sites where significant pollution problems exist (i.e. S2–S4). The results reveal that the eastern coast of Saudi Arabia, in the Arabian Gulf, is still contaminated, as indicated by elevated HSP70, LPO content and numbers of histological lesions, and that monitoring of contaminants and their effects should be continued in this region.

Molluscan assemblage as pollution indicators in Al-Khobar coastal plain, Arabian Gulf, Saudi Arabia

2019 ◽  
Vol 158 ◽  
pp. 103564
Author(s):  
Abdelbaset S. El-Sorogy ◽  
Talal Alharbi ◽  
Sattam Almadani ◽  
Mansour Al-Hashim
Keyword(s):  
Saudi Arabia ◽  
Coastal Plain ◽  
Arabian Gulf ◽  
Pollution Indicators ◽  
Molluscan Assemblage
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