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Silicon-mediated highly efficient synthesis of 1,8-dioxo-octahydroxanthenes and their transformation to novel functionalized pyrano-tetrazolo[1,5-a]azepine derivatives

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Chinese Chemical Letters 2013年第5期24卷 404-406页

作者： Hanan A.Soliman tarek a.salama Photochemistry Department National Research Center Chemistry Department Faculty of ScienceMansoura University

A facile and highly efficient protocol for the synthesis of 1,8-dioxo-octahydroxanthene derivatives was achieved through cascade Knoevenagel-Michael condensations and cyclo-dehydration reaction utilizing tetrachlorosilane（TCS） as catalyst under mild *** of the titled compounds with TCSNaN_3 to give novel functionalized pyrano[3,2-c]tetrazolo[1,5-a]azepine derivatives is also described.

关键词： Tetrachlorosilane 1,8-Dioxo-octahydroxanthenes Synthesis Tetrazoln[1,5-a]azepines

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Silicon mediated synthesis and selected transformations of β-chloroketones

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Chinese Chemical Letters 2011年第10期22卷 1171-1174页

作者： tarek a.salama Saad S.Elmorsy Chemistry Department Faculty of ScienceMansoura University35516 MansouraEgypt Chemistry Department Faculty of EducationAmran UniversityAmranYemen

A combination of tetrachlorosilane（TCS） and phenol in dichloromethane was found to be an efficient reagent for hydro-chlorination ofα,β-unsaturated ketones to afford the correspondingβ-chloroketones in good yield at ambient temperature. Reactions of the titled compounds with TCS-NaN_3 as well as with nitriles utilizing TCS-ZnCl_2 to give 1,5-disubstituted tetrazole derivatives orβ-amido ketones respectively are also described.

关键词： Tetrachlorosilane Phenol β-Chloroketones Synthesis Tetrazoles β-Amido ketones

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N-Terminal Pro-BNP in Acute Coronary Syndrome Patients with ST Elevation versus Non ST Elevation Myocardial Infarction

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International Journal of Clinical Medicine 2011年第3期2卷 218-223页

作者： Ragaa H. M salama Alaa E. A El- Moniem Nour El-Hefney tarek Samor Department of Biochemistry King Fahed Specialist Hospital KSA.

The study aimed to evaluate the differences in secretion of NT-proBNP and conventional cardiac markers in patients with STE-ACS vs NSTE-ACS as a trial to solve the dilemma of the early detection of myocardial ischemia in NSTE-ACS. Sixty two patients with acute coronary syndrome (ACS) divided into 2 groups according to ECG: group1 with elevated ST segment in ECG (STE-ACS) and group 2 with non elevated ST segment (NSTE-ACS).Twenty healthy subjects with matched age and sex were enrolled as control group in this study. In the sera of all subjects, levels of NT –proBNP, CK-MB and troponin-T were measured by different kits. CK-MB and TnT were both significantly higher in STE-ACS patients compared to NSTE-ACS patients. Conversely, NT-proBNP was significantly higher in NSTE-ACS patients than STE-ACS especially within 4 hours from onset of chest pain. Comparison between NT-proBNP, TnT and CK-MB levels by ROC curves revealed area under the curves = 0.68, 0.31, 0.17 respectively. NT-proBNP at cutoff 415 pg/mL in NSTE-ACS patients had higher sensitivity and specificity (92%, 39%;respectively) than other markers that will help in earl diagnosis of NSTE-ACS.

关键词： NT-proPNB Acute Coronary Syndrome ST Segment Cardiac Markers

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Dermatophytosis in special patient populations

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Journal of Coastal Life Medicine 2016年第4期4卷 324-326页

作者： salama A.Ouf tarek A.Moussa Alshimaa M.Abd-Elmegeed Samar R.Eltahlawy Botany and Microbiology Department Faculty of ScienceCairo University12613GizaEgypt Medical Laboratory Ahmed Maher HospitalCairoEgypt Medical Biology Department Faculty of MedicineGizan UniversityGizanSaudia Arabia Dermatology Department Faculty of MedicineCairo UniversityGizaEgypt

Objective:To study the occurrence and prevalence of dermatomycosis in special patient populations suffering from diabetes,cancer and heart ***:A total of 640 patients suffering from diabetes,280 patients suffering from cancer and 210 patients suffering from heart diseases from Cairo City were evaluated for dermatophytosis at the dermatology clinics of four different hospitals from January 2005 to December ***:The presence of diabetes looks a risk factor for tinea pedis and tinea *** cruris and tinea unguium were not common among diabetics,while tinea capitis and tinea versicolor were completely *** capitis followed by tinea pedis are the most common among cancer *** cases were recorded for tinea among 210 patients with heart diseases of which tinea capitis and tinea versicolor were recorded once while the other clinical types of tinea were estimated in 6-8 patients for each ***:The present investigation shows that diabetes remains to be a risk factor for dermatophytosis and cancer comes next due to the use of radioactive irradiation.

关键词： Dermatophytosis Prevalence Dermatology Cancer Diabetes

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Controllable synthesis of Na P zeolite and its application in calcium adsorption

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Science China Materials 2015年第8期58卷 621-633,593页

作者： Ibraheem O.Ali Said M.El-Sheikh tarek M.salama Mostafa F.Bakr Mohamed H.Fodial Department of Chemistry Faculty of Science Al-Azhar University Nanostructured Materials Lab Advanced Materials Department Central Metallurgical R&D Institute (CMRDI)

NaP zeolite particles were prepared through a template-free hydrothermal condition at 100oC. Parameters like Na2O/Si O2 and Si O2/Al2O3 molar ratios, gel aging time and aging temperature were investigated for regulating the crystallization of the final product. The samples at different synthesis stages were characterized with N2 adsorption at-196oC, field emission scanning electron microscopy(FE-SEM), temperature programmed desorption of ammonia adsorption, X-ray diffraction, thermogravimetric and differential scanning calorimetry analysis and Fourier transform infrared spectroscopy. The experimental results evidenced that a high ordering crystallinity of Na P zeolite was obtained at Na2O/Si O2 and Si O2/Al2O3 molar ratios of 1.10 and 1.40, respectively, and a temperature of 100°C for 4 days of aging. FE-SEM image exhibited polycrystalline aggregates of Na P zeolite with crystallite sizes ranging up to 5.04 μm with cactus/cabbage like structures. The quantitative analysis of the total number of acid sites was found to increase as Na2 O increases. The Na P zeolite sample with a Na2O/Si O2 molar ratio of 1.13 exhibited a large fraction of the acid sites on its external surface, contrary to that synthesized with a relevant ratio of 1.10. The optimized Na P zeolite could be successfully bestowed with excellent sorption properties of Ca(II) in aqueous solution. The kinetic parameters for Ca(II) adsorption were thoroughly investigated.

关键词：分子筛钙离子合成泡沸石凝血因子Ⅳ NaP Al 摩尔比 Si

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The Role of Vitamin E in Cerebral Hypoxia: An Ultrastructural Study

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Surgical Science 2013年第1期4卷 100-106页

作者： Essam Eldin A. salama Ali Hassan A. Ali Abdullah M. Aldahmash Saeed M. Abou El Makarem tarek A. El Ghamrawy Gamal M. Aboulhassan Hisham Alkhalidi Mohammed Mubarak Anatomy Department Faculty of Medicine Al-Azhar University Cairo Egypt Anatomy Department Faculty of Medicine Cairo University Giza Egypt Anatomy Department King Saud University Riyadh KSA Pathology Department King Saud University Riyadh KSA

Hypoxia, due to impaired cerebral blood flow, has hazardous effects on brain structure and function. To minimize as much as possible the neurological consequences from hypoxic-ischemic (HI) brain injury, neuro-protective strategies are urgently required. Vitamin E has been shown to have protective effects against cerebral ischemia, possibly due to its anti-oxidant effects. Thirty albino rats, of both sexes, were obtained from the animal house at King Khalid University Hospital, King Saud University. They were divided into three groups;each included 10 animals: Group A was considered as a control one, animals of Group B were subjected to a permanent link to the carotid arteries on both sides and animals of Group C underwent permanent link to carotid arteries on both sides and concomitantly were given Vitamin E as an anti-oxidant. Animals of Group C were injected by Vitamin E (equivalent to 15 mg/day), into the peritoneal cavity as a single dose for a week and after the prescribed period the mice were sacrificed under deep anesthesia and their brains were extracted and prepared for an electron microscopic study of brain tissue. Specimens from animals of Group B showed a large number of neurons that had been deteriorated. Mitochondria were the most affected organelles. There were a large number of dark cells which probably resulted from shrunken nerve cells and exhibited opaque nuclei. The number of affected nerve cells was much lower in brain tissues from animals of the Group C which revealed absence of dark cells. The study did not disclose any similar changes in brain tissues of the control group animals. Our results suggested that treatment with Vitamin E after hypoxia-ischemia led to a neuro-protective effect that appeared in reduction of cell death of neurons. Thus, the present study provides an evidence that Vitamin E protects the brain tissue of the consequences of hypoxia caused by ischemia in the tested experimental animals. It could be recommended in the tre

关键词： Hypoxia Vitamin E Ischemia

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