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

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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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Evaluation of the versatility of perforators-enhanced rhomboid flap technique for ischial sores reconstruction

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Chinese Journal of Plastic and Reconstructive Surgery 2024年第2期6卷 65-71页

作者： Waleed aldabaany Ashraf Hussein Elghamry montaser Hosny mohamed yassin Department of Plastic Surgery Faculty of MedicineFayoum UniversityFayoum63514Egypt

Background: Prolonged pressure on the skin known as pressure sores, can cause frequent injuries to the skin and underlying tissues. However, several prevention approaches, including non-surgical and surgical management,are available. In flap surgery for pressure sores, a variety of flap types may be used;each offers certain benefits and some incidences of complications and recurrence. This study evaluated the versatility of the perforatorenhanced rhomboid flap technique for ischial sore ***: This prospective study was conducted in the Plastic Surgery Department of Fayoum University *** perforator-enhanced rhomboid flap technique was employed in 20 patients with ischial pressure sores who failed to respond to conservative treatment. A proper history was obtained and a preoperative arterial duplex was performed to determine the site of the prominent perforators for their preservation at the base of the *** follow-ups and evaluations were ***: The mean age of the study group was 43.7 ± 13.1, ranging from 19 to 65 years. moreover, 80% of the participants were males while 20% were female. The main etiology of the sores was paraplegia in 45% of *** mean surface area of sores was 24.8 ± 6.3 cm2. In 75% of cases, the color match of the flap was rated as excellent. Similarly, 70% of the patients rated flap thickness as excellent. In 55% of the cases, the scar appearance was deemed excellent. Overall satisfaction was reported as excellent by 40% of the patients, while only 5% reported poor satisfaction. Approximately, 10% of the cases were identified with seroma, and 30% had wound dehiscence of a mean size of 1.33 ± 0.98 cm and required around 6.8 ± 1.9 weeks to ***: The perforator-enhanced rhomboid flap technique is a versatile method for reconstructing ischial pressure sores owing to its technical ease, short operative time, reliable vascularity, aesthetic outcome, matching skin color, and short recove

关键词： Ischial pressure sores Perforators-enhanced rhomboid flaps Reconstruction

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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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Hydrocephalus Secondary to Intraventricular myxopapillary Ependymoma: Case Report

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World Journal of Neuroscience 2024年第3期14卷 85-91页

作者： Juan Carlos Ayala-alvarez Onyekachi Emmanuel Anyagwa Fátima Gabriela macías-Ortiz Oluwatoyin Adalia Dairo Courtney Storm Truebody Reza Badrnejad Aishwarya Bhuta Shashwat Sandeep Phade Srushti Kishor Jamdar mostafa yassin Vismaja Vijayan Neurology Department Hospital Civil Fray Antonio Alcalde Guadalajara Jalisco Mxico School of medicine New Vision University Tbilisi Georgia

Ependymomas are a somewhat diverse category of glial tumors that often develop from the lining of the brain’s ventricles, or the spinal cord’s central canal. They make up 5% of all neuroepithelial tumors, 10% of paediatric brain tumors, and up to 33% of brain tumors in children under the age of three. Hydrocephalus is one of the complications, and it can be identified as progressive macrocephaly or increasing head circumference crossing percentiles, nausea, vomiting, poor appetite, irritability, and regression of developmental milestones.

关键词： Hydrocephalus myxopapillary Ependymoma (mPE) Paediatrics Neurosurgery Glioma Intracranial Hypertension

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Numerical Study of Flow and Gas Diffusion in the Near-Wake behind an Isolated Building

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Advances in Atmospheric Sciences 2009年第6期26卷 1241-1252页

作者： mohamed F.yassin Department of Environmental Technology management College for WomenKuwait University P.O.Box 5969KuwaitSafat 13060Kuwait Faculty of Engineering Assiut UniversityAssiut-71516Egypt

To assist validation of the experimental data of urban pollution dispersion, the effect of an isolated building on the flow and gaseous diffusion in the wake region have been investigated numerically in the neutrally stratified rough-walled turbulent boundary layer. Numerical studies were carried out using Computational Fluid Dynamics （CFD） models. The CFD models used for the simulation were based on the steady-state Reynolds-Average Navier-Stoke equations （RANS） with κ-ε turbulence models; standard κ-ε and RNG κ-ε models. Inlet conditions and boundary conditions were specified numerically to the best information available for each fluid modeling simulation. A gas pollutant was emitted from a point source within the recirculation cavity behind the building model. The accuracy of these simulations was examined by comparing the predicted results with wind tunnel experimental data. It was confirmed that simulation using the model accurately reproduces the velocity and concentration diffusion fields with a fine-mish resolution in the near wake region. Results indicated that there is a good agreement between the numerical simulation and the wind tunnel experiment for both wind flow and concentration diffusion. The results of this work can help to improve the understanding of mechanisms of and simulation of pollutant transport in an urban environment.

关键词： atmospheric turbulence CFD model isolated building pollutant dispersion

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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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Experimental study and Shannon entropy analysis of pressure fluctuations and flow mode transition in fluidized dense phase pneumatic conveying of fly ash

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Particuology 2020年第2期18卷 169-178页

作者： yassin alkassar Vijay KAgarwal RKPandey Niranjana Behera Industrial Tribology Machine Dynamic and Maintenance Engineering CentreIndian Institute of Technology DelhiNew Delhi 110016India Department of mechanical Engineering Indian Institute of Technology DelhiNew Delhi 110016India School of mechanical Engineering Vellore Institute of Technology UniversityVellore 632014India

The objective of this study was to relate experimental pressure fluctuation behavior to the transition in mode of flow observed in fluidized dense phase pneumatic conveying of fly *** entropy and wavelet analysis were utilized to extract features of the flow *** db4 wavelet analysis of pulsating air pressure revealed that the flow mechanism of fly ash in a fluidized dense phase possessed non-steady characteristics associated with gradual aeration of dunes along the direction of *** of Shannon entropy values along the length of the pipeline were assessed to determine the location at which the flow converted from dense to dilute phase *** effects of conveying parameters and specific power consumption on Shannon entropy and variations of the local power consumption coefficient are discussed.

关键词： Fluidized dense phase mode transition Wavelet Shannon entropy

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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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