Publications by authors named "Mohamed Haroun"

9 Publications

  • Page 1 of 1

Geology and ore genesis data of Elba manganese deposits, southern Eastern Desert, Egypt.

Data Brief 2019 Dec 18;27:104831. Epub 2019 Nov 18.

Geology Department, Faculty of Science, Ain Shams University, Cairo, 11566, Egypt.

The manganese deposits of Egypt are logged in many different localities in the Eastern Desert. Several manganese deposits were exploited by open cast mining excavation in the Red Sea coastal plain, particularly in the area covering from south-west of Halayeb Village to around the flood-plain of Wadi Elba north-east of Abu Ramad. Our study discussed the manganese deposits in twelve areas named as wadi Bashoya, Oshbia, N-Gabal Toyo, El-Hebal, Mateet, Blownay, Adeeb, Sarara, Sirmatai, Aqilahuq, Eikwan and N-wadi Ajway. There are two types of manganese deposits it can occur either as massive manganese ore type or mangneferous sandstone ore type. The area is situated at the Abu Ramad fault system which is the major belt of shearing within the NW -SE striking fault system. It forms part of Red Sea on south Eastern Desert in NW-SE direction with sub vertical dip. The deformation history attributed to Arc accretion tectonic of the Pan African Orogeny, also lies at the eastern part of North Hamizana Shear Zone. Binary diagram between (Co + Ni) wt. % versus (As + Cu + Mo + Pb + V + Zn) wt. % display the hydrothermal origin and supported by the MnO (wt. %) FeO (wt. %) and ppm (Cu + Co + Ni) 1000 triangle diagram and also by the Mn (wt. %) Fe (wt. %) and 10*(Ni + Co + Cu) wt. % triangle diagram. These deposits are characterized by low concentration of Cu, Ni and Co. The geochemical composition of manganese ores reflect formation by chemical precipitation from hydrothermal solution but occurrence of colloform texture, oolites in the mangneferous types denote to the redeposition by sedimentation processes.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.dib.2019.104831DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6880021PMC
December 2019

Geochemistry dataset of the Sol Hamed Neoproterozoic ophiolitic serpentinites, southern Eastern Desert, Egypt.

Data Brief 2019 Aug 14;25:104393. Epub 2019 Aug 14.

Geology Department, Faculty of Science, Minia University, El-Minia, 61519, Egypt.

The Sol Hamed (SH) area is a part of the Arabian-Nubian Shield (ANS) ophiolites occurred within Onib-Sol Hamed suture zone in the southern Eastern Desert of Egypt. The ophiolitic assemblages in this area are represented by serpentinite, metagabbro and arc assemblages represented by metavolcanics. They later intruded by gabbroes and granites. The compatible trace elements (Cr = 2426-2709 ppm, Ni = 1657-2377 ppm and Co = 117-167 ppm) enrichment in SH serpentinites indicate derivation from a depleted mantle peridotite source. They show affinity to the typical metamorphic peridotites. The normative compositions reflect harzburgitic mantle source. Their AlO contents (0.05-1.02 wt %) are akin to oceanic and active margin peridotites and Pan-African serpentinites. The Cr and TiO contents indicate supra-subduction zone (SSZ) environment. Their AlO/SiO and MgO/SiO ratios support the SSZ affinity and are similar to ANS peridotites with fore-arc setting. Moreover, their AlO and CaO depletion is typical of fore-arc peridotites.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.dib.2019.104393DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6718821PMC
August 2019

Qatar experience on One Health approach for middle-east respiratory syndrome coronavirus, 2012-2017: A viewpoint.

One Health 2019 Jun 4;7:100090. Epub 2019 Apr 4.

Ministry of Public of Health, Doha, Qatar.

The emergence of the Middle East Respiratory Syndrome Corona Virus (MERS-CoV) in the Middle East in 2012 was associated with an overwhelming uncertainty about its epidemiological and clinical characteristics. Once dromedary camels () was found to be the natural reservoir of the virus, the public health systems across the Arabian Peninsula encountered an unprecedented pressure to control its transmission. This view point describes how the One Health approach was used in Qatar to manage the MERS-CoV outbreak during the period 2012-2017. One Health focuses on the association between the human, animals and environment sectors for total health and wellbeing of these three sectors. To manage the MERS outbreak in Qatar through a One Health approach, the Qatar National Outbreak Control Taskforce (OCT) was reactivated in November 2012. The animal health sector was invited to join the OCT. Later on, technical expertise was requested from the WHO, FAO, CDC, EMC, and PHE. Subsequently, a comprehensive One Health roadmap was delivered through leadership and coordination; surveillance and investigation; epidemiological studies and increase of local diagnostic capacity. The joint OCT, once trained had easy access to allocated resources and high risk areas to provide more evidence on the potential source of the virus and to investigate all reported cases within 24-48 h. Lack of sufficient technical guidance on veterinary surveillance and poor risk perception among the vulnerable population constituted major obstacles to maintain systematic One Health performance.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.onehlt.2019.100090DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6462540PMC
June 2019

Molecular pathotyping and phylogenesis of the first Newcastle disease virus strain isolated from backyard chickens in Qatar.

Trop Anim Health Prod 2015 Jan 3;47(1):13-9. Epub 2014 Oct 3.

Virology Unit, Veterinary Laboratory, Department of Animal Resources, P.O. Box 23211, Doha, Qatar,

The first Newcastle disease virus (NDV) field strain (NDV-QC08), previously isolated and identified in Qatar, was further subjected to molecular characterization and phylogenic analysis at passage levels two. Initial amplification and detection of the complementary DNA (cDNA) fragment of the NDV RNA amnioallantoic fluid (AAF) extract demonstrated the positive virus identity using real-time reverse transcriptase chain reaction (RRT-PCR). Partial sequence of the totally amplified 216 bp of the functional cleavage region encoding the F gene retrieved (112)R-R-Q-K-R-F(117) amino acid motif indicating the velogenic nature of the strain, and confirming the previously investigated in-vivo pathotyping. Phylogenic analysis and genotypic clustering studies classified the strain under NDV subgenotype VIId.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1007/s11250-014-0677-3DOI Listing
January 2015

Reversal of the enantiomeric elution order of some aromatic amino acids using reversed-phase chromatographic supports coated with the teicoplanin chiral selector.

Talanta 2006 Jan 10;68(3):1032-6. Epub 2005 Aug 10.

Département de Pharmacochimie Moléculaire UMR 5063 CNRS, Institut de Chimie Moléculaire de Grenoble FR 2607, Université Joseph Fourier, UFR de Pharmacie de Grenoble, Domaine de la Merci, La Tronche, France.

In this paper, two chiral stationary phases were prepared by coating the surface of both C8 and C18 high-performance liquid chromatography (HPLC) supports with the teicoplanin chiral selector. The hydrophobic C11 acyl side chain, attached to the D-glucosamine group of teicoplanin, served as anchor moiety for the immobilization of the chiral selector on the apolar support material. The retention and enantioselectivity of these coated stationary phases were studied using some aromatic amino acids as probe solutes and an aqueous solution as mobile phase. It was found that the enantiomer elution order on the modified C8 and C18 stationary phases was reversed (L>D) relatively to that classically observed with a teicoplanin covalently immobilized on a silica support (D>L). Such a dynamic coating on the reversed-phase supports was found to be of interest since the apparent enantioselectivity was not significantly changed by the use during an extended period of time or following a long-term storage of the columns.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.talanta.2005.07.009DOI Listing
January 2006

Copper(II) complexes of lipophilic aminoglycoside derivatives for the amino acid enantiomeric separation by ligand-exchange liquid chromatography.

J Chromatogr A 2008 Mar 12;1185(2):291-5. Epub 2008 Feb 12.

Département de Pharmacochimie Moléculaire UMR 5063 CNRS, Institut de Chimie Moléculaire de Grenoble FR 2607, Université Grenoble I (Joseph Fourier), UFR de Pharmacie, 38041 Grenoble Cedex 9, France.

In this paper, a new class of ligand-exchange chiral stationary phase (LE-CSP) based on the copper complexes of lipophilic aminoglycoside derivatives was reported. Different stationary phases were developed by coating reversed-phase liquid chromatography supports with three neamine derivatives carrying a lipophilic octadecyl chain at the 4', 5 and 6 positions, respectively. The enantioselective ability of these LE neamine-based CSPs was evaluated and the 4'-derivative coated column was found to be the most interesting one for the amino acid resolution. The effects of the variation of several chromatographic parameters on the enantioseparation were evaluated in order to identify the analysis optimal conditions.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.chroma.2008.02.017DOI Listing
March 2008

Thermodynamic origin of the chiral recognition of tryptophan on teicoplanin and teicoplanin aglycone stationary phases.

J Sep Sci 2005 Mar;28(5):409-20

Département de Pharmacochimie Moléculaire, UMR 5063 CNRS, ICMG FR 2607, UFR de Pharmacie, Université Joseph Fourier, Grenoble, France.

The D-, L-tryptophan binding and the chiral recognition properties of the teicoplanin and teicoplanin aglycone (TAG) chiral stationary phase (CSPs) were compared at various column temperatures. The solute adsorption isotherms (bi-Langmuir model) were determined for both the two CSPs using the perturbation method. It was demonstrated that the sugar units were involved in the reduction of the apparent enantioselectivity through two phenomena: (i) the inhibition of some enantioselective contacts with low-affinity binding regions of the aglycone and (ii) a decrease in the stereoselective properties of the aglycone high-affinity binding pocket. The phenomenon (ii) was governed by both a decrease in the ratio of the enantiomer adsorption constant and a strong reduction of the site accessibility for D- and L-tryptophan. In addition, a temperature effect study was performed to investigate the chiral recognition mechanism at the aglycone high-affinity pocket. An enthalpy-entropy compensation analysis derived from the Grunwald model as well as the comparison with the literature data demonstrated that the enantioselective binding mode was dependent on an interface dehydration process. The change in the enantioselective process observed between the TAG and teicoplanin CSP was characterized by a difference of ca. 2-3 ordered water molecules released from the species interface.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1002/jssc.200400043DOI Listing
March 2005

Salt effects on the interaction of an amphiphilic model molecule with immobilized phosphatidylcholine monolayers.

J Chromatogr A 2002 Nov;977(2):185-92

The retention of hydrocortisone (used as an amphiphilic model solute) on an immobilized artificial membrane (IAM) column was investigated in relation to the mobile phase concentration of three sodium salts (representing different rankings in the Hofmeister series, i.e. perchlorate, chloride and sulfate) in order to provide insight into the nature of the solute interactions with phospholipid monolayers. The influence of the salt series on solute retention was found to follow the Hofmeister series, emphasizing the role of hydrophobic effect in the solute retention mechanism on phospholipid monolayers. Retention models based on the extended Wyman relations (preferential interaction theory) were developed to analyze more quantitatively the salt effects on the hydrocortisone retention factor. This analysis as well as additional thermodynamic study suggested that the hydrocortisone binding to IAM involved both an insertion into the hydrophobic inside governed by hydrophobic effects and contacts with the interfacial region implying interactions such as van der Waals interactions/hydrogen bonds between the solute hydroxyl groups and the polar headgroups of phospholipidmonolayers.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1016/s0021-9673(02)01352-3DOI Listing
November 2002