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Assessment of plant diversity of endemic species of the Saharo-Arabian region in Egypt

Journal of Arid Land 2024年第7期16卷 1000-1021,I0002-I0044页

作者： Asmaa S ABO HATAB yassin m al-sodany Kamal H SHalTOUT Soliman A HAROUN mohamed m EL-KHalAFY Botany and microbiology Department Faculty of ScienceKafrelsheikh UniversityKafrelsheikh 33511Egypt Botany Department Faculty of ScienceTanta UniversityTanta 31527Egypt

Savanna, semi-deserts, and hot deserts characterize the Saharo-Arabian region, which includes morocco, mauretania, algeria, Tunisia, Libya, Egypt, Palestine, Kuwait, Saudi Arabia, Qatar, Bahrain, the United Arab Emirates, Oman, Yemen, southern Jordan, Syria, Iraq, Iran, Afghanistan, Pakistan, and northern India. Its neighboring regions, the Sudano-Zambezian region belonging to the Paleotropical Kingdom and the mediterranean and Irano-Turanian regions included in the Holarctic Kingdom, share a large portion of their flora with the Saharo-Arabian region. Despite the widespread acknowledgment of the region's global importance for plant diversity, an up to date list of the Saharo-Arabian endemics is still unavailable. The available data are frequently insufficient or out of date at both the whole global and the national scales. Therefore, the present study aims at screening and verifying the Saharo-Arabian endemic plants and determining the phytogeographical distribution of these taxa in the Egyptian flora. Hence, a preliminary list of 429 Saharo-Arabian endemic plants in Egypt was compiled from the available literature. Indeed, by excluding the species that were recorded in any countries or regions outside the Saharo-Arabian region based on different literature, database reviews, and websites, the present study has reduced this number to 126 taxa belonging to 87 genera and 37 families. Regarding the national geographic distribution, South Sinai is the richest region with 83 endemic species compared with other eight phytogeographic regions in Egypt, followed by the Isthmic Desert(the middle of Sinai Peninsula, 53 taxa). Sahara regional subzone(SS1) distributes all the 126 endemic species, Arabian regional subzone(SS2) owns 79 taxa, and Nubo-Sindian subzone(SS3) distributes only 14 endemics. Seven groups were recognized at the fourth level of classification as a result of the application of the two-way indicator species analysis(TWINSPAN) to the Saharo-Arabian endemic sp

关键词： endemism phytogeographical regions Saharo-Arabian floristic region Egyptian flora plant diversity two-way indicator species analysis(TWINSPAN)

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Vegetation diversity along the altitudinal and environmental gradients in the main wadi beds in the mountainous region of South Sinai,Egypt

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Journal of mountain Science 2020年第10期17卷 2447-2458页

作者： Kamal H.SHalTOUT yassin m.al-sodany Ebrahem m.EID Selim Z.HENEIDY mostafa A.TAHER Botany Department Faculty of ScienceTanta UniversityTanta31527Egypt Botany Department Faculty of ScienceKafrelsheikh UniversityKafr El-Sheikh33516Egypt Biology Department College of ScienceKing Khalid UniversityAbha61321Saudi Arabia Botany and microbiology Department Faculty of ScienceMoharam BeyAlexandria UniversityAlexandria21511Egypt Botany Department Faculty of ScienceAswan UniversityAswan81528Egypt

South Sinai includes Egypt’s highest mountains that resemble an ecological island surrounded by *** present study aims to analyse the vegetation physiognomy along the altitudinal and environmental gradients in the main wadi beds in South Sinai mountainous *** includes determining the natural,native-weed and alien vegetation in representative stands in this region,analysing their vegetation in terms of species composition,abundance and life forms and determining the national and global distribution of the associated *** investigation also aims to describe the prevailing plant communities and assess the role of environmental conditions that affect the vegetation in this ***,thirty-two stands were chosen during march-June 2018 to reflect the prevailing altitude and environmental *** species was 316(229 genera and 61 families):186 species were perennials(58.9%),while 130 were annuals(41.1%).In addition,152 species were native weeds(48.1%of total species),31 were aliens(9.8%),along with 133 natural species(42.1%).Eight species were recorded as endemic to Egypt:Anarrhinum pubescens,Euphorbia sanctae-catharinae,Hypericum sinaicum,Origanum syriacum ***,Phlomis aurea,Primula boveana,Rosa arabica and Solanum *** addition,10 species were recorded as near-endemics to Egypt and other adjacent countries:allium desertorum,Asclepias sinaica,Centaurea scoparia,Fagonia mollis ***,Hyoscyamus boveanus,Iphiona mucronata,micromeria sinaica,Pterocephalus sanctus,Salvia deserti and Stachys *** the present study,33 species are threatened and categorized as follows:8 endangered,8 vulnerable and one indeterminate,while the rest were evaluated by the authors as *** rich plant diversity of this region is due to its extensive mountainous massif,which supports many *** high elevations in this region hinder the dispersal process of propagules,a situation which often tends to increase endemic and ne

关键词： Conservation Elevation gradient multivariate analysis Plant diversity Sinai Threatened species

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Planning Target Volume margin in Linac-Based Stereotactic Radiosurgery for Brain metastases

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Journal of Cancer Therapy 2024年第7期15卷 265-272页

作者： Hany S. Attallah Radwa m. Hamed Khaled m. EL-Shahat aliaa mahmoud mahmoud Abdallah Ibraheem Haggag Emad moustafa Adel yassin Department of Radiation Oncology International Medical Center (IMC) Cairo Egypt Department of Radiation Oncology Armed Forces Medical Collogue (AFCM) Cairo Egypt Department of medical Physics Al Azhar University Cairo Egypt Department of medical Physics International Medical Center (IMC) Cairo Egypt Department of medical Physics Department of Clinical Oncology Faculty of Medicine Zagazig University Zagazig Egypt

Background: The treatment of brain metastases with radiotherapy has shifted to the use of Stereotactic Radio-surgery (SRS). The technical issue of expanding the treatment volume around the Gross Tumor Volume (GTV) is a current debate. Radiotherapy centers use variable GTV-PTV margins, ranging from one to 2 mm. material and methods: We performed a dosimetric comparison in plans of twenty patients using three margins: PTV zero, PTV1, and PTV2. We also developed imaginary Peel volumes. These volumes are described as follows: Peel1 = PTV1 − GTV, Peel2 = PTV2 − GTV. Results: Our results showed that the mean PTV volume differed significantly across the different margins (p = 0.000). The V12 of the brain significantly varied as a function of PTV margin (p = 0.000). The target coverage and plan quality indices were not significantly different. The Peel volume dosimetric analysis showed that the mean dose was significantly higher in the nearby normal brain tissue: Peel1 (p = 0.022) and Peel 2 (p = 0.013). Conclusion: According to our dosimetric analysis, expanding the GTV into a PTV by 1 mm margin is more convenient than 2 mm.

关键词： SRS Brain metastases PTV

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Optimizing Cr^(3+) concentration and evaluating energy transfer from Cr^(3+) to Nd^(3+) in Cr,Nd:GGG nanocrystals prepared by sol-gel method

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Journal of Rare Earths 2016年第11期34卷 1077-1082页

作者： yassin alshikh mohamad Yomen Atassi Zafer moussa Department of Applied Physics Higher Institute for Applied Science and Technology

Nanopowder of Cr：GGG and nanopowder of Cr,Nd：GGG with different concentrations of Cr3＋ ranging from 0.1 at.% to 1.5 at.% were synthesized by the sol-gel method using acetic acid and ethylene glycol. Thermal gravimetric analysis and differential scanning calorimetry （TGA-DSC）, X-ray diffraction （XRD） and photoluminescence spectroscopy were used to characterize the powder. The crystallite size was about 58 nm when treated at 1000 oC for 2 h. Cr3＋ photoluminescence spectrum in GGG showed a broad band emission around 730 nm. The intensity of this band decreased when co-doped with Nd, indicating an efficient energy transfer from Cr3＋ to Nd3＋. Photoluminescence intensity of Nd in Cr,Nd：GGG at 1.06μm showed that the optimum concentration of Cr3＋ was about 1 at.% （more or less） for 1 at.% Nd3＋. This result was also confirmed by chromium fluorescence decay rate analysis. Energy transfer efficiency was found to be about 84% for 1 at.% concentration of each chromium and neodymium.

关键词： nanopowder Cr,Nd:GGG sol-gel fluorescence lifetime energy transfer efficiency rare earths

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Anti-müllerian hormone and antral follicle count predict ovarian response in women less than 45 years following GnRH antagonist multiple-dose protocol

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Asian pacific Journal of Reproduction 2022年第5期11卷 208-216页

作者： mohammed m.Laqqan maged m.yassin Department of Laboratory medical Sciences Faculty of Health SciencesIslamic University of GazaP.O.Box 108GazaPalestine Department of Human Physiology Faculty of MedicineIslamic University of GazaP.O.Box 108GazaPalestine

Objective:To speculate which of the following parameters:antral follicle count(AFC),anti-müllerian hormone(AmH),follicle-stimulating hormone(FSH)and age can be used as a predictor of ovarian response to gonadotropin-releasing hormone(GnRH)antagonist stimulation multiple-dose protocol in women under 45 years,and to determine the cutoff value of these parameters and their correlations for predicting low and high ovarian ***:This prospective study included 462 women with the mean age of(29.3±6.5)*** women were subjected to the GnRH antagonist stimulation multiple-dose *** the second day of the menstrual cycle,ultrasonography was conducted to determine AFC in both *** blood samples were collected to evaluate the level of estradiol,FSH,luteinizing hormone,prolactin,thyroid-stimulating hormone,and *** women were divided into three groups:low response(AHHmL,n=173),normal response(AmH=1.0-3.5 ng/mL,n=175),and high response(AmH>3.5 ng/mL,n=114).Results:A significant decrease was found in the age and FSH level in the high response group compared to other groups(PmH,estradiol on human chorionic gonadotropin(hCG)day,AFC,mature oocytes,fertilized oocytes,and embryos transferred in the high response group compared to the other two groups(Pmonstrated that AFC and AmH had the highest accuracy,followed by basal FSH level and age in the prediction of low ovarian reserves(Palues of≤4.50 and≤0.95 for AFC and AmH,***,the ROC analysis showed that AFC had the highest accuracy,followed by AmH level and age in the prediction of high ovarian reserves with a cutoff value of≥14.50,≥3.63,and≤27.50 years,respectively(Pmen's age,estradiol level,and oocyte fertilization rate in pregnant women compared to non-pregnant women(Pally,sign

关键词： Antral follicle count Anti-müllerian hormone Antagonist Controlled ovarian stimulation GnRH multiple-dose Ovarian response

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Workhorse flaps for thumb reconstruction

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Plastic and Aesthetic Research 2022年第1期9卷 48-64页

作者： Ahmed m.yassin Suvashis Dash Dariush Nikkhah Plastic Surgery Department Faculty of MedicineMansoura UniversityMansoura 35511Egypt Department of Plastic and Reconstructive Surgery All India Institute of Medical SciencesNew Delhi 110029India Division of Surgery&Interventional Science University College London UCLLondon NW32PFUK Department of Plastic Surgery Royal Free Hospital NHS Foundation TrustHampsteadLondon NW32QGUK

Posttraumatic thumb defects result in significant functional *** reconstructive procedures have been described for the management and improvement of *** with no treatment,all reconstructive methods are *** of the available procedures may be more applicable under certain conditions,can offer great benefits,and have its own downsides as *** a thorough assessment and meticulous technique,the results of thumb reconstruction can be *** present a review of the current reconstructive procedures for traumatic thumb amputation.

关键词： Thumb reconstruction soft tissue reconstruction of thumb thumb injury hand flaps

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multiphysics simulation of VVER-1200 fuel performance during normal operating conditions

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Nuclear Science and Techniques 2023年第2期34卷 139-152页

作者： Khaled m.yassin mohamed H.Hassan mohammad m.Ghoneim mostafa S.Elkolil Adel alyan Said A.Agamy Nuclear Research Center Egyptian Atomic Energy AuthorityAbo Zaabal 13759CairoEgypt Department of Nuclear and Radiological Engineering Faculty of EngineeringAlexandria UniversityAlexandria 21544Egypt Faculty of Engineering Egyptian Russian UniversityBadr 11829Egypt

Nuclear fuel performance modeling and simulation are critical tasks for nuclear fuel design optimization and safety analysis under normal and transient *** performance is a complicated phenomenon that involves thermal,mechanical,and irradiation mechanisms and requires special multiphysics *** this study,a fuel performance model was developed using the COmSOL multiphysics *** modeling was performed for a 2D axis-symmetric geometry of a UO2fuel pellet in the E110 clad for VVER-1200 *** modeling considers all relevant phenomena,including heat generation and conduction,gap heat transfer,elastic strain,mechanical contact,thermal expansion,grain growth,densification,fission gas generation and release,fission product swelling,gap/plenum pressure,and cladding thermal and irradiation *** model was validated using a code-to-code evaluation of the fuel pellet centerline and surface temperatures in the case of constant power,in addition to validation of fission gas release(FGR)*** prediction proved that the model could perform according to previously published VVER nuclear fuel performance parameters.A sensitivity study was also conducted to assess the effects of uncertainty on some of the model *** model was then used to predict the VVER-1200 fuel performance parameters as a function of burnup,including the temperature profiles,gap width,fission gas release,and plenum pressure.A compilation of related material and thermomechanical models was conducted and included in the modeling to allow the user to investigate different material/performance *** the model was developed for normal operating conditions,it can be modified to include off-normal operating conditions.

关键词： VVER-1200 Fuel performance COmSOL code Zr-1%Nb cladding UO2 fuel rod

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Planning Target Volume margin in Linac-Based Stereotactic Radiosurgery for Brain metastases

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Journal of Cancer Therapy（癌症治疗） 2024年第7期 265页

作者： Hany S.Attallah Radwa m.Hamed Khaled m.EL-Shahat aliaa mahmoud mahmoud Abdallah Ibraheem Haggag Emad moustafa Adel yassin

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Changes in corneal biomechanics and intraocular pressure following Femto-LASIK using Goldman applanation tonometry and ocular response analyzer

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International Journal of Ophthalmology(English edition) 2020年第5期13卷 782-787页

作者： Ahmed yassin Hemida Omar m Said Asser A.E.Abdel-meguid mohammed Iqbal Amani E Badawi Department of Ophthalmology Fayoum Ophthalmic HospitalFayoum 63514Egypt Department of Ophthalmology Faculty of MedicineFayoum UniversityFayoum 63514Egypt Department of Ophthalmology Faculty of MedicineCairo UniversityCairo 11562Egypt Department of Ophthalmology Faculty of MedicineSohag UniversitySohag 8242Egypt Department of Ophthalmology Faculty of MedicineMansoura UniversityMansoura 35516Egypt

AIm:To compare intraocular pressure(IOP)measurements before and after laser in situ keratomileusis(LASIK)with a femtosecond laser for flap creation using ocular response analyzer(ORA)and Goldmann applanation tonometry,and to identify factors that may influence the preoperative and postoperative ***:A prospective study conducted on myopic patients who underwent LASIK using a femtosecond laser for flap *** patients were evaluated preoperatively,6 wk and 3 mo postoperatively for manifest refraction(mR),keratometric(K)readings and central corneal thickness(CCT)using a scheimpflug-based *** resistance factor(CRF),corneal hysteresis(CH),Goldmann correlated IOP(IOPg)and corneal compensated IOP(IOPcc)were measured using ORA besides IOP assessment by Goldman applanation tonometry(GAT).RESULTS:There was a statistically significant decrease in measures of IOPg by 3.35±0.83 mm Hg,followed by GAT which decreased by 2.2±0.44 mm Hg,and the least affected by operation was IOPcc which decreased only by 0.87±0.1 mm Hg after 6 *** 3 mo follow up there was a statistically significant decrease in IOPcc which decreased only by 0.76±0.4 mm Hg,followed by IOP GAT by 1.6±0.5 mm Hg,and the most affected by operation was IOPg which decreased by 2.3±0.3 mm ***,there was a statistically significant decrease in CH and CRF after 6 wk and 3 *** 3 mo,the preoperative mR and preoperative GAT were prominent significant predictors of the postoperative GAT *** prediction equation was ***:IOP measurements and corneal biomechanical factors reduce significantly after LASIK with a femtosecond laser for flap *** IOPcc values are less influenced by changes in corneal properties than IOPg and GAT,indicating that IOPcc may provide the most reliable measurement of IOP after this procedure.

关键词： intraocular pressure laser in situ keratomileusis femtosecond laser ocular response analyzer corneal biomechanics myopia

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Photoelectrochemical evaluation of SILAR-deposited nanoporous BiVO4 photoanodes for solar-driven water splitting

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Nano materials Science 2020年第3期2卷 227-234页

作者： Siti Nur'ain Haji yassin Adrian Soong Leong Sim James Robert Jennings Faculty of Science Universiti Brunei DarussalamJalan Tungku LinkBE 1410Brunei Darussalam

We report a photoelectrochemical investigation of BiVO4 photoanodes prepared by successive ionic layer adsorption and reaction(SILAR),a facile method that yields uniform nanoporous *** characterization of the phase,morphology,composition,and optical properties of the prepared films,the efficiencies of charge separation(ηsep)and water oxidation(ηox)in solar water splitting cells employing these photoanodes were estimated following a previously reported *** wavelength and illumination direction dependencies were discovered in the derived efficiencies,casting doubt on the validity of the *** alternative approach using a diffusion–reaction model that explicitly considers the efficiency of electron collection resolved the discrepancies and explained the illumination direction dependence of the *** diffusion lengths(Ln)of 0.45μm and 0.55μm were derived for pristine and cobalt phosphate(Co-Pi)modified BiVO4,respectively,which are much shorter than the film thickness of^2.1μ*** Co-Pi treatment also increasedηoxfrom 0.86 to^1,which is the main reason for the overall performance enhancement caused by adding *** findings suggest that there is little scope for improving the performance of SILAR-deposited BiVO4 photoanodes by further catalyzing water oxidation,but enhanced performance is achievable if electron transport can be improved.

关键词： Bismuth vanadate BiVO4 Solar water splitting Electron diffusion length Charge collection efficiency Water oxidation efficiency Charge separation efficiency

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