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Abdelkader, M. M., and Mohamed Abdelmohsen, "Hydrogen-bonded and supramolecular ferroelectricity in a new hybrid (C12H25NH3)2CoCl4", Materials Research Express, vol. 6, issue 2: IOP Publishing, pp. 025608, 2018. AbstractWebsite

A new organic-inorganic layered halide perovskite ((C12H25NH3)2CoCl4) has been synthesized and characterized by: chemical analysis, x-ray powder diffraction, differential scanning calorimetry, and differential thermal analysis thermographs. The dielectric and ferroelectric properties have been investigated. Analysis of the ac conductivity σac (ω, T) measured in the temperature interval from 110 K to 370 K and at selected frequencies in the range 1 kHz < f < 100 kHz and the results show that the Jonscher universal power law is accurately obeyed. The existence of ferroelectricity has been demonstrated by the hysteresis P-E loop. The collective data evidenced that the hybrid behaves as a proper ferroelectric rather than a relaxor one and undergoes an order-disorder ferroelectric phase transition at the Curie temperature Tc (Tc ≈ 360 K) accompanied with a structural distortion from an intercalated to non- intercalated state as the other Co and/or Zn hybrids. Since the room temperature space group of the hybrid is centrosymmetric (P21/c), the ferroelectricity should be due to the supramolecular interaction which results from the induced dipoles. The hydrogen bonding system of the type N–H….Cl plays the key role in the mechanism of supramolecular ferroelectricity.

Abdelkader, M. M., and Mohamed Abdelmohsen, "Hydrogen-bonded and supramolecular ferroelectricity in a new hybrid (C 12 H 25 NH 3 ) 2 CoCl 4", Materials Research Express, vol. 6, issue 2, pp. 025608, 2019.
Mansour, A. M., and N. T. Abdel-Ghani, "Hydrogen-bond effect, spectroscopic and molecular structure investigation of sulfamethazine Schiff-base: Experimental and quantum chemical calculations", Journal of Molecular Structure, vol. 1040, pp. 226-237, 2013.
Kassem, A., E. F. S. Taha, A. Hassan, and A. H. Osman, "Hydrogen Sulfide Suppress the Pathological Alterations of Endocrine GlandsInduced by Gamma Irradiation and Cyclophosphamide.", International Journal of Pharmaceutical Sciences andClinical Research, vol. 2, issue 2, pp. 1-9, 2022.
Ahmed, H. H., F. M. Taha, H. S. Omar, H. M. Elwi, and M. Abdelnasser, "Hydrogen sulfide modulates SIRT1 and suppresses oxidative stress in diabetic nephropathy.", Molecular and cellular biochemistry, vol. 457, issue 1-2, pp. 1-9, 2019. Abstract

DN is recognized as not only a leading cause of end stage renal disease (ESRD) but also an independent risk factor for cardiovascular disease (CVD). Novel therapeutic approaches to diabetic nephropathy (DN) are needed, or else, healthcare resources will be overwhelmed by the expected worldwide increase in associated cases of ESRD and CVD. Reactive oxygen species (ROS) and advanced glycation end product (AGE) are implicated in the development of DN. Hydrogen sulfide (HS) is known for its antioxidant and antiapoptotic characteristics. Simultaneously diabetics have lower HS levels. Thus, it is worth investigating the use of HS in treatment of DN. To investigate the potential therapeutic role of HS in DN. Sixty male rats were divided into four groups: control, DN, DN+NaHS30 µmol/kg/day and DN+NaHS100 µmol/kg/day. Fasting blood sugar (FBS), kidney function tests, SIRT1 activity, superoxide dismutase activity (SOD), malondialdehyde (MDA) and expression of caspase3 and p53 in renal tissues were assessed. Kidney was examined histopathologically. DN rats had higher FBS, renal dysfunction, decreased SIRT1 and SOD activity levels, increased caspase3 and p53 relative expression and increased MDA in renal tissues. NaHS increased SIRT1 and reversed biochemical, apoptotic, oxidant and pathologic parameters characteristic of DN, with better results using a dose of 100 µmol/kg/day. HS has a protective role against DN through decreasing FBS, ROS, apoptosis and upregulating SIRT1, thus preserving renal cells from further damage caused by DM.

Abdelmonema, M., N. N. Shahina, L. A. Rashed, H. A. A. Aminc, A. A. Shamaa, and A. A. Shaheena, "Hydrogen sulfide enhances the effectiveness of mesenchymal stem cell. therapy in rats with heart failure: In vitro preconditioning versus in vivo codelivery. ", Biomedicine & Pharmacotherapy , vol. 112, 2019.
Abdelmonem, M., N. N. Shahin, L. A. Rashed, H. A. A. Amin, A. A. Shamaa, and A. A. Shaheen, "Hydrogen sulfide enhances the effectiveness of mesenchymal stem cell therapy in rats with heart failure: In vitro preconditioning versus in vivo co-delivery.", Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie, vol. 112, pp. 108584, 2019 Feb 18. Abstract

Stem cell therapy represents a promising therapeutic avenue for cardiac disorders, including heart failure. Although stem cell transplantation showed encouraging preliminary results, the outcomes of clinical studies are still unsatisfactory. This study aimed to compare the outcomes of two therapeutic approaches, in vivo co-delivery of sodium hydrogen sulfide (NaHS) concomitant with bone marrow-derived mesenchymal stem cell (BMSC) transplantation and in vitro preconditioning of BMSCs with NaHS, both of which are intended to promote the success of stem cell therapy in rats with isoprenaline-induced heart failure. Heart failure developed 4 weeks after the subcutaneous injection of isoprenaline (170 mg/kg) for 4 consecutive days. The in vivo approach involved the co-delivery of intraperitoneally administered NaHS concomitant with BMSC transplantation for a period of 14 days. The in vitro approach involved preconditioning BMSCs with NaHS for 30 min before transplantation. Compared to treatment with BMSCs alone, in vitro preconditioning of BMSCs with NaHS improved left ventricular function as measured by echocardiography and electrocardiography and enhanced stem cell homing, proliferation and differentiation as manifested by higher cardiac expression of GATA-4 and myocyte enhancer factor 2. Moreover, the measurement of cardiac transforming growth factor beta 1 levels and histopathological investigation revealed mitigated fibrosis and myocardial injury scores. Compared with BMSC therapy alone, the in vivo approach enhanced stem cell homing and differentiation, alleviated fibrosis and augmented vascular endothelial growth factor (VEGF) and endothelial nitric oxide synthase (eNOS) expression. In conclusion, NaHS can potentiate the efficiency of BMSC therapy for heart failure by in vitro preconditioning or in vivo co-delivery. The in vitro approach is superior with regard to improving cardiac function in addition to enhancing stem cell proliferation, while the in vivo approach is superior with regard to increasing cardiac VEGF and eNOS expression.

Abdelmonem, M., N. N. Shahin, L. A. Rashed, H. A. A. Amin, A. A. Shamaa, and A. A. Shaheen, "Hydrogen sulfide enhances the effectiveness of mesenchymal stem cell therapy in rats with heart failure: In vitro preconditioning versus in vivo co-delivery.", Biomedicine & Pharmacotherapy, vol. 112, pp. 108584, 2019.
Aboulhoda, B. E., L. A. Rashed, H. A. Ahmed, Eman MM Obaya, W. Ibrahim, Marwa AL Alkafass, Sarah A Abd El‐Aal, and A. M. Shams Eldeen, "Hydrogen sulfide and mesenchymal stem cells‐extracted microvesicles attenuate LPS‐induced Alzheimer's disease", Journal of Cellular Physiology, vol. 236, issue 8, pp. 5994-6010, 2021.
Esily, R. R., Y. Chi, D. M. Ibrahiem, and Y. Chen, "Hydrogen Strategy in decarbonization era: Egypt as a case study", International Journal of Hydrogen Energy, vol. 47, issue 43, pp. 18629-18647, 2022.
Sata, S., M. I. Awad, M. S. El-Deab, T. Okajima, and T. Ohsaka, "Hydrogen spillover phenomenon: Enhanced reversible hydrogen adsorption/desorption at Ta2O5-coated Pt electrode in acidic media", Electrochimica Acta, vol. 55, pp. 3528-3536, 2010.
W.A.Badawy, H. E. El-Feky, N. H. Helal, and H. H. Mahmmed, "Hydrogen Production on Molybdenum in H2SO4 Solutions", J. Power Sources, vol. 271 , pp. 480-488, 2014.
de Lux, C. G., S. Joshi-Barr, E. a Mahmoud, and A. Almutairi, "Hydrogen peroxide-responsive polymeric nanoparticles for diagnostics and drug delivery in inflammatory disease", ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, vol. 245: AMER CHEMICAL SOC 1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2013. Abstract
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Khalil, M. W., and A. M. A. Rahim, "Hydrogen Evolution Reaction on Titanium and Oxide-Covered Titanium Electrodes", Mat.-wiss. u. Werkstofftech. , vol. 22, pp. 390-395, 1991.
El-Deab, M. S., M. E. El-Shakre, B. E. El-Anadouli, and B. G. Ateya, "Hydrogen Evolution on Stacked Copper Screen Electrodes from Flowing Alkaline Solutions", International Journal of Hydrogen Energy, vol. 21, pp. 273-280, 1996.
Azza A. Ghoneim, Renad S. El-Kamel, and A. M. Fekry, "Hydrogen evolution and quantum calculations for potassium sorbate as an efficient green inhibitor for biodegradable magnesium alloy staples used for sleeve gastrectomy surgery", i n t e rna t i onal journal o f hydrogen energy , vol. 45, pp. 2 4 3 7 0-2 4 3 8 2, 2020.
El-Karim, R. A., S. El-Raghy, M. Megahed, and H. Ghazal, "Hydrogen embrittlement of AISI 4140 stud bolts", Materials performance, vol. 44, no. 9: National Association of Corrosion Engineers, pp. 50–54, 2005. Abstract
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Buchet, R., L. Beauvais, and C. Sandorfy, "Hydrogen bond equilibrium constants of some unusual nucleotide base pairs.", Journal of biomolecular structure & dynamics, vol. 2, issue 1, pp. 221-32, 1984 Aug. Abstract

Approximate hydrogen bond association constants were determined for base pairs formed by an adenine derivative and a number of unusual pyrimidine bases. A series is found in which the H-bond strength in the base-pairs varies. In certain cases the H-bond equilibrium constant is larger than in the adenine-thymine pair. Inosine derivatives seem to have a non-negligible chance of replacing guanosine in the guanosine-cytosine pair. Infrared, near-infrared (overtone) and NMR spectra were used to determine the equilibrium constants.

AHMED, A. A., R. H. Hilal, and M. F. Shibl, "Hydrogen bond coupling in Sodium Dihydrogen Triacetate. Journal of Molecular Modeling", Journal of Molecular Modeling, 2014.
Ahmed, A. A., R. H. Hilal, and M. F. Shibl, "Hydrogen bond coupling in sodium dihydrogen triacetate", Journal of molecular modeling, vol. 20, issue 8: Springer Berlin Heidelberg, pp. 2363, 2014. Abstract
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Ahmed, A. A., R. H. Hilal, and M. F. Shibl, "Hydrogen bond coupling in sodium dihydrogen triacetate", Journal of molecular modeling, vol. 20, issue 8: Springer Berlin Heidelberg, pp. 1-10, 2014. Abstract
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Abbass, M., A. A. El-Rashidy, K. M. Sadek, S. El Moshy, I. A. Radwan, D. Rady, C. E. Dörfer, and K. M Fawzy El-Sayed, "Hydrogels and Dentin–Pulp Complex Regeneration: From the Benchtop to Clinical Translation", Polymers, vol. 12, issue 12: Multidisciplinary Digital Publishing Institute, pp. 2935, 2020. Abstract
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Abbass, M., A. A. El-Rashidy, K. M. Sadek, S. El Moshy, I. A. Radwan, D. Rady, C. E. Dörfer, and K. M Fawzy El-Sayed, "Hydrogels and dentin–pulp complex regeneration: from the benchtop to clinical translation", Polymers, vol. 12, issue 12: Multidisciplinary Digital Publishing Institute, pp. 2935, 2020. Abstract
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Abbass, M. M. S., A. A. El-Rashidy, K. M. Sadek, S. El Moshy, I. A. Radwan, D. Rady, C. E. Dörfer, and K. F. M. El-Sayed, "Hydrogels and Dentin–Pulp Complex Regeneration: From the Benchtop to Clinical Translation", Polymers, vol. 12, 2020.