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Rudists(Bivalvia) from a Cretaceous Platform in Northern Egypt: Taxonomy and Paleobiogeography

Acta Geologica Sinica(English Edition) 2021年第6期95卷 1967-1983页

作者： yasser salama Jamaan S.AJAREM Ahmed A.ALLAM Ahmed M.ALMALKI Geology Department Faculty of ScienceBeni-suef UniversityBeni-suef 65211Egypt Department of Zoology College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Zoology Faculty of ScienceBeni-suef UniversityBeni-suef 65211Egypt

New well-preserved rudist materials come from the Barremian–Turonian marine formations in the Yelleg, Minsherah, Maaza, and Raghawi sections in North Sinai, northern Egypt. There, 17 discovered rudist species belonging to 13 genera and seven taxonomic families are described in detail as follows: Eoradiolites plicatus(Conrad), Eoradiolites liratus(Conrad), Praeradiolites ponsianus(d'Archiac), Archaeoradiolites sp., Bournonia africana Douvillé, Bournonia fourtaui Douville, Biradiolites lombricalis(d'Orbigny), Biradiolites zumoffeni Douville, Radiolites lewyi lewyi Parnes, Radiolites sauvagesi(d'Hombres-Firmas), Durania arnaudi(Choffat), Toucasia carinata(Matheron), Toucasia sp., Neocaprina raghawiensis Steuber and Bachmann, Sellaea sp., Ichthyosarcolites sp. and Horoiopleura sp.. The Cenomanian deposits in the northern Eastern desert of Egypt only contain E. liratus. The domination of the Cenomanian rudist species in North Sinai, however, is attributed to changes in the platform, which passes mainly from carbonate in the north to siliciclastics in the south. The presence of Horiopleura sp. in the late Barremian-early Aptian deposits is documented for the first time, which suggests the expansion of taxa of the genus Horiopleura Douville to North Sinai during this interval. The age of the rudist species is documented from the late Barremian-Turonian formations, with their geographic distribution in the Mediterranean region considered..

关键词： invertebrate paleontology mollusks rudists Taxonomy Paleobiogeography Barremian–Turonian Egypt

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Sequence Stratigraphy and Rudist Facies Development of the Upper Barremian-Lower Cenomanian Platform, Northern Sinai, Egypt

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Acta Geologica Sinica(English Edition) 2018年第1期92卷 286-310页

作者： yasser salama Michael GRAMMER Shaban SABER Soheir EL-SHAZLY Gouda ABDEL-GAWAD Beni-Suef University Faculty of SciencesGeology Department Boone Pickens School of Geology Oklahoma State University

The Lower Cretaceous sections in northern Sinai are composed of the Risan Aneiza(upper Barremian-middle Albian) and the Halal(middle Albian-lower Cenomanian) formations. The facies reflect subtle paleobathymetry from inner to outer ramp facies. The inner ramp facies are peritidal, protected to open marine lagoons, shoals and rudist biostrome facies. The inner ramp facies grade northward into outer ramp deposits. The upper Barremian-lower Cenomanian succession is subdivided into nine depositional sequences correlated with those recognized in the neighbouring Tethyan areas. These sequences are subdivided into 19 medium-scale sequences based on the facies evolution, the recorded hardgrounds and flooding surfaces, interpreted as the result of eustatic sea level changes and local tectonic activities of the early Syrian Arc rifting stage. Each sequence contains a lower retrogradational parasequence set that constituted the transgressive systems tracts and an upper progradational parasequence set that formed the highstand systems tracts. Nine rudist levels are recorded in the upper Barremian through lower Cenomanian succession at Gabal Raghawi. At Gabal Yelleg two rudist levels are found in the Albian. The rudist levels are associated with the highstand systems tract deposits because of the suitability of the trophic conditions in the rudist-dominated ramp.

关键词： Cretaceous sequence stratigraphy rudists Sinai Egypt

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Robotic versus open transversus abdominis release and incisional hernia repair: A case-control study

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Laparoscopic, Endoscopic and Robotic Surgery 2020年第3期3卷 59-62页

作者： Jenna Reeves Shreya Mehta Ramesh Damodaran Prabha yasser salama Anubhav Mittal Department of Upper Gastro-Intestinal Tract Surgery Royal North Shore HospitalSt.LeonardsNew South WalesAustralia The University of Sydney Northern Clinical School SydneyNew South WalesAustralia Department of Surgery Mater HospitalPacific Highway GreenwichNew South WalesAustralia

Objective:Transversus abdominus release(TAR)is often required to achieve apposition of the rectus muscles and achieve wide mesh reinforcement of the abdominal wall.Traditionally,TAR has been done with an open technique(oTAR),and the benefits of the newer robotic approach(rTAR)has not been well established in the Australian setting.The aim of this study was to compare the results of oTAR with rTAR to demonstrate its safety and efficacy.Methods:A retrospective review of patients who underwent rTAR and oTAR at two tertiary hospitals was conducted between January 2018 and January 2020 in New South Wales,Australia.Patient demographics,perioperative and postoperative outcomes were compared in both groups.Results:There were 26 patients identified to have undergone TAR(13 rTAR,13 oTAR).Both groups were comparable in regards to age,sex and defect size.oTAR was associated with a higher American Society of Anaesthesiologist score.rTAR was associated with significantly longer average operative time(260.0±78.9 min vs.185.7±64.5 min,p=0.017)but found to have a significantly shorter length of stay(3.6±2.1 d vs.6.9±3.6 d,p=0.007)with a comparable complication rate.Conclusions:rTAR is associated with shorter length of hospital stay with comparable postoperative outcomes when compared to oTAR.We are seeing increasing evidence supporting the safety and benefits of robotics,however larger scale studies are required to fully understand this approach.

关键词： Ventral hernia Incisional hernia Transversus abdominis release Robotic hernia repair

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Insights into the adsorption performance and mechanism of Cr(Ⅵ)onto porous nanocomposite prepared from gossans and modified coal interface:Steric,energetic,and thermodynamic parameters interpretations

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Chinese Journal of Chemical Engineering 2023年第9期61卷 118-128页

作者： Mohamed Mobarak Saleh Qaysi Mohamed Saad Ahmed yasser F.salama Ahmed Mohamed Abbass Mohamed Abd Elrahman Hamdy AAbdel-Gawwad Moaaz K.Seliem Physics Department Faculty of ScienceBeni-Suef UniversityEgypt Geology and Geophysics Department College of ScienceKing Saud University11451 RiyadhSaudi Arabia Geology Department Faculty of ScienceBeni-Suef UniversityEgypt Department of Building Materials and Construction ChemistryInstitute of Civil EngineeringTechnische Universitat BerlinBerlinGermany Structural Engineering Department Faculty of EngineeringMansoura UniversityMansouraEgypt Raw Building Materials and Processing Technology Research Institute Housing and Building National Research Center(HBRC)CairoEgypt Faculty of Earth Science Beni–Suef UniversityEgypt

Herein,iron oxide/hydroxides deposits(gossans)were utilized,for the first time,in the fabrication of magnetite nanoparticles(MNPs)to load modified coal(MC).The as-synthesized MNPs@MC composite was characterized via different techniques and utilized for the Cr(Ⅵ)remediation.Experimental studies supported by theoretical treatment were applied to offer a new overview of the Cr(Ⅵ)adsorption geometry and mechanism at 25-45℃.Experimental results suggested that the Cr(Ⅵ)uptake was mainly governed by adsorption-reduction coupled mechanism.The Langmuir model fitted well the Cr(Ⅵ)adsorption data with maximum adsorption capacities extended from 115.24 to 129.63 mg·g^(-1).Theoretical calculations indicated that Cr(Ⅵ)ions were adsorbed on the MNPs@MC following the theory of the advanced monolayer statistical model.The number of ions removed per site ranged from 1.88 to1.23 suggesting the involvement of vertical geometry and multi-ionic mechanism at all temperatures.The increment of the active sites density and the adsorption capacity at saturation with improving temperature reflected an endothermic process.Energetically,the Cr(Ⅵ)adsorption was controlled by physical forces as the adsorption energies were less than 40 kJ·mol^(-1).The calculated free enthalpy,entropy.and internal energy explained the spontaneous nature and the viability of Cr(Ⅵ)adsorption on the MNPs@MC adsorbent.These results offer a new approach in utilizing the iron-rich deposits as gossans in the preparation of magnetic and low-cost adsorbents for wastewater remediation.

关键词： Coal Magnetic nanoparticles Cr(Ⅵ)adsorption Statistical models Thermodynamic parameters

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