Fibrin Sealant and Lipoabdominoplasty in Obese Grade 1 and 2 Patients

Amr Abdel Wahab Mabrouk,Hesham Aly Helal,Soha Fathy Al Mekkawy,Nada Abdel Sattar Mahmoud,Ahmed Mohamed Abdel-Salam 대한성형외과학회 2013 Archives of Plastic Surgery Vol.40 No.5

Background Ever since lipoabdominoplasty was first developed to achieve better aesthetic outcomes and less morbidity, the rate of seroma formation, especially in obese patients, has disturbed plastic surgeons. The aim of this study was to evaluate the effect of fibrin sealant in the prevention of seroma formation after lipoabdominoplasty in obese patients. Methods Sixty patients with a body mass index (BMI) between 30 and 39.9 were assigned randomly to 1 of 2 groups (30 patients each). Group A underwent lipoabdominoplasty with fibrin glue, while group B underwent traditional lipoabdominoplasty; both had closed suction drainage applied to the abdomen. The patients’ demographics and postoperative complications were recorded. Seroma was detected using abdominal ultrasound examinations at two postoperative periods: between postoperative days 10 and 12 and, between postoperative days 18and 21. Results The age range was 31 to 55 years (38.5±9.5 years) in group A and 25 to 58 years (37.8±9.1 years) in group B, while the mean BMI was 31.4 to 39.9 kg/m2 (32.6 kg/m2) in group A and 32.7 to 37.4 kg/m2 (31.5 kg/m2) in group B. In group A, the patients had a complication rate of 10% in group A versus 43% in group B (P<0.05). The incidence of seroma formation was 3% in the fibrin glue group but 37% in the lipoabdominoplasty-alone group (P<0.05). Conclusions Lipoabdominoplasty with the use of autologous fibrin sealant is a very effective method that significantly reduces the rate of postoperative seroma.

Fibrin Sealant and Lipoabdominoplasty in Obese Grade 1 and 2 Patients

Mabrouk, Amr Abdel Wahab,Helal, Hesham Aly,Al Mekkawy, Soha Fathy,Mahmoud, Nada Abdel Sattar,Abdel-Salam, Ahmed Mohamed Korean Society of Plastic and Reconstructive Surge 2013 Archives of Plastic Surgery Vol.40 No.5

Background Ever since lipoabdominoplasty was first developed to achieve better aesthetic outcomes and less morbidity, the rate of seroma formation, especially in obese patients, has disturbed plastic surgeons. The aim of this study was to evaluate the effect of fibrin sealant in the prevention of seroma formation after lipoabdominoplasty in obese patients. Methods Sixty patients with a body mass index (BMI) between 30 and 39.9 were assigned randomly to 1 of 2 groups (30 patients each). Group A underwent lipoabdominoplasty with fibrin glue, while group B underwent traditional lipoabdominoplasty; both had closed suction drainage applied to the abdomen. The patients' demographics and postoperative complications were recorded. Seroma was detected using abdominal ultrasound examinations at two postoperative periods: between postoperative days 10 and 12 and, between postoperative days 18 and 21. Results The age range was 31 to 55 years ($38.5{\pm}9.5$ years) in group A and 25 to 58 years ($37.8{\pm}9.1$ years) in group B, while the mean BMI was 31.4 to 39.9 $kg/m^2$ (32.6 $kg/m^2$) in group A and 32.7 to 37.4 $kg/m^2$ (31.5 $kg/m^2$) in group B. In group A, the patients had a complication rate of 10% in group A versus 43% in group B (P<0.05). The incidence of seroma formation was 3% in the fibrin glue group but 37% in the lipoabdominoplasty-alone group (P<0.05). Conclusions Lipoabdominoplasty with the use of autologous fibrin sealant is a very effective method that significantly reduces the rate of postoperative seroma.

Chemical profile and beneficial effect of standardized extract of Stevia rebaudiana Bertoni leaves on metabolic syndrome in high fat diet streptozotocin‑induced diabetic rats

Kamal Nagham H.,Essmat Ahmed,El Askary Hesham I.,El Hefnawy Hala M.,Wahab Samia M. Abdel,Meselhy Meselhy R. 한국응용생명화학회 2022 Applied Biological Chemistry (Appl Biol Chem) Vol.65 No.4

Stevia (Stevia rebaudiana Bertoni) is a natural zero calorie sweetener with significant economic and medicinal values due to its high contents of steviosides (SVGs) in the leaves. The aqueous extract of Stevia leaves (TAqE) was standardized to contain 8.5% w/w of SVGs (HPLC), total phenolics (164.63 ± 1.39 μg Gallic acid/mg extract) and total flavonoids of 100.5 ± 0.79 μg QE/mg extract. Twenty-one compounds were tentatively identified in the leaves via UPLC-Orbitrap HRMS and stevioside, rebaudioside A, and quercetrin were isolated from TAqE by repeated column chromatography. Stevioside showed significant inhibition of pancreatic lipase, α-amylase, and α-glucosidase enzymes. The effect of a standardized TAqE on high fat diet (HFD)-streptozotocin (STZ)-induced diabetic rats was investigated. Thirty-six animals were divided into 6 groups (each of 6). Rats in group I (control) and group II (control/HFD-STZ) received distilled water, and rats in groups III and IV received TAqE for 4 weeks in two doses; 300 mg/kg b.wt., and 500 mg/kg b.wt., respectively. Rats in group V received metformin (200 mg/kg), while those in group VI received statin (1 mg/kg). Body weight, fasting blood glucose, lipid profile (total cholesterol and triglycerides), liver enzymes (alanine transaminase and aspartic transaminase), and serum kidney parameters (urea and creatinine) were decreased in rats treated with TAqE (300 mg/kg b.wt.), while insulin sensitivity was enhanced, when compared to that in group II. These findings could justify the use of Stevia as a complementary medicine for the prevention and treatment of metabolic changes associated with diabetes mellitus type 2.

Theoretical and experimental investigations of Co-Cu bimetallic alloys-incorporated carbon nanowires as an efficient bi-functional electrocatalyst for water splitting

Zafar Khan Ghouria,Ahmed Badreldin,Khaled Elsaid,Dharmesh Kumar,Karim Youssef,Ahmed Abdel-Wahab 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.96 No.-

Application of noble metal-free electrocatalysts for oxygen evolution reaction (OER) and hydrogenevolution reaction (HER) during electrocatalytic water splitting is crucial for clean energy conversion andhas drawn extensive attention. However, the development of highly active and low cost electrocatalysts isa considerable challenge. Herein, Co-Cu alloy nanoparticles-incorporated carbon nanowires electrocatalystwas synthesized and evaluated for both OER and HER. The nanomaterials were fabricated byfacile electrospinning of sol-gel composed of cobalt acetate, copper acetate, and poly(vinyl alcohol)followed by calcination in an inert environment. Adjusting the composition of the metallic counterpartwas found to significantly enhance electrochemical properties of the catalyst. Furthermore, the uniquenanowire morphology and structural properties of incorporated Co-Cu alloy, the (Co0.95Cu0.05@CNWs)composition exhibits good electrocatalytic performance for both OER and HER in the alkaline medium. Physicochemical characterizations using X-ray diffraction, X-ray photoelectron spectroscope, scanningelectron microscopy, and transmission electron microscopy have confirmed the formation of alloystructure and nanowire morphology. The optimum composition (Co0.95Cu0.05@CNWs) requires smalloverpotential, ɳ10 of285 mV for oxygen evolution reaction (OER) and160 mV for hydrogen evolutionreaction (HER) with the corresponding Tafel slope of 92 mV dec 1 and 172 mV dec 1 versus the reversiblehydrogen electrode, respectively. In addition, only negligible loss in activity was observed after 1000cycles and prodeces cell voltage of 1.58 V at current of 10 mA/cm2 and 1.72 V at current density of 50 mA/cm2 in two electrode system. Density Functional Theory (DFT) calculations were employed to verifyexperimental results. Electronic density of states (DOS) results reveal an increase in electronic states nearthe Fermi level upon Co-Cu heterojunctioning with CNWs. This is indicative of improved catalytic activityand more favorable binding energies of HER and OER intermediates. Reaction coordinate diagrams forHER and OER were developed, which aided in identifying thermodynamically limiting steps. This workmay provide a feasible approach for incorporating other transition metals to design low-cost and highperformancebifunctional electrocatalysts for overall water splitting.

Evaluating the Catalytic Effects of Carbon Materials on the Photocatalytic Reduction and Oxidation Reactions of TiO2

Gulzar Khan,Young Kwang Kim,최성규,한동석,Ahmed Abdel-Wahab,박현웅 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.4

TiO2 composites with seven different carbon materials (activated carbons, graphite, carbon fibers, singlewalled carbon nanotubes, multi-walled carbon nanotubes, graphene oxides, and reduced graphene oxides) that are virgin or treated with nitric acid are prepared through an evaporation method. The photocatalytic activities of the as-prepared samples are evaluated in terms of H2 production from aqueous methanol solution (photocatalytic reduction: PCR) and degradation of aqueous pollutants (phenol, methylene blue, and rhodamine B) (photocatalytic oxidation: PCO) under AM 1.5-light irradiation. Despite varying effects depending on the kinds of carbon materials and their surface treatment, composites typically show enhanced PCR activity with maximum 50 times higher H2 production as compared to bare TiO2. Conversely, the carbon-induced synergy effects on PCO activities are insignificant for all three substrates. Colorimetric quantification of hydroxyl radicals supports the absence of carbon effects. However, platinum deposition on the binary composites displays the enhanced effect on both PCR and PCO reactions. These differing effects of carbon materials on PCR and PCO reactions of TiO2 are discussed in terms of physicochemical properties of carbon materials, coupling states of TiO2/carbon composites, interfacial charge transfers. Various surface characterizations of composites (UV-Vis diffuse reflectance, SEM, FTIR, surface area, electrical conductivity, and photoluminescence) are performed to gain insight on their photocatalytic redox behaviors.

Characterization and UV Protection of Cotton and Cotton/Polyester Blend Fabrics Coated With PVA/PLST/ZnO NPs Nanocomposites Under the Effect of Gamma Irradiation

Nisreen M. Ali,Saleh N. Saleh,Magdy Ahmed,Mahmoud S. Hassan,Abdel Wahab M. El‑Naggar 한국섬유공학회 2023 Fibers and polymers Vol.24 No.11

The main objective of this work is to impart UV protection properties to cotton and cotton/polyester fabrics and enhance the original chemical and physical properties. In this procedure, the fabrics were coated with nanocomposites based on poly(vinyl alcohol)/plasticized starch (PVA/PLST (80/20%)/Zn NPs. The coated fabrics were then exposed to gamma radiation to induce cross-linked layer structure covering the fibers of the fabrics. The formation of Zn NPs was confirmed by UV/Vis and XRD analysis. In addition, the coated fabrics were characterized by the measurements of water absorption, crease recovery, thermal stability, surface morphology and tensile mechanical measurements. The UV protection of the coated fabrics was determined. The results indicated that the coated fabrics showed highly reducing UV-A, UV-B and ultraviolet protection factor (UPF), particularly with increasing irradiation dose, regardless of fabric kind. It was found that cotton and cotton/PET fabrics treated with PVA/PLST/Zn NPs nanocomposites irradiated to a dose of 30 kGy displayed UPF excellent rating values of 44.31 and 58.23, respectively.

Evaluating the Catalytic Effects of Carbon Materials on the Photocatalytic Reduction and Oxidation Reactions of TiO₂

Khan, Gulzar,Kim, Young Kwang,Choi, Sung Kyu,Han, Dong Suk,Abdel-Wahab, Ahmed,Park, Hyunwoong Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.4

$TiO_2$ composites with seven different carbon materials (activated carbons, graphite, carbon fibers, single-walled carbon nanotubes, multi-walled carbon nanotubes, graphene oxides, and reduced graphene oxides) that are virgin or treated with nitric acid are prepared through an evaporation method. The photocatalytic activities of the as-prepared samples are evaluated in terms of $H_2$ production from aqueous methanol solution (photo-catalytic reduction: PCR) and degradation of aqueous pollutants (phenol, methylene blue, and rhodamine B) (photocatalytic oxidation: PCO) under AM 1.5-light irradiation. Despite varying effects depending on the kinds of carbon materials and their surface treatment, composites typically show enhanced PCR activity with maximum 50 times higher $H_2$ production as compared to bare $TiO_2$. Conversely, the carbon-induced synergy effects on PCO activities are insignificant for all three substrates. Colorimetric quantification of hydroxyl radicals supports the absence of carbon effects. However, platinum deposition on the binary composites displays the enhanced effect on both PCR and PCO reactions. These differing effects of carbon materials on PCR and PCO reactions of $TiO_2$ are discussed in terms of physicochemical properties of carbon materials, coupling states of $TiO_2$/carbon composites, interfacial charge transfers. Various surface characterizations of composites (UV-Vis diffuse reflectance, SEM, FTIR, surface area, electrical conductivity, and photoluminescence) are performed to gain insight on their photocatalytic redox behaviors.

Single-use endoscopes: A narrative review

Maged Tharwat Elghannam,Moataz Hassan Hassanien,Yosry Abdelrahman Ameen,Gamal Mohammed Elattar,Ahmed Ali El Ray,Emad Abdel Wahab Turky,Mohammed Darwish El Talkawy 소화기인터벤션의학회 2022 Gastrointestinal Intervention Vol.11 No.1

The transmission of infections through gastrointestinal endoscopy is a vital issue. The main problem lies in the use of duodenoscopes due to mechanical aspects of the scope design. Even with high-level disinfection, sterilization of the scope can fail. Hence, the Food and Drug Administration has encouraged a shift to single-use endoscopes. Available options include endoscopes with single-use components (mainly single-use endcaps), fully single-use duodenoscopes (SUDs), and even those with a disposable elevator mechanism. Clinical trials revealed that both reusable and single-use scopes have the same efficacy, while single-use scopes have benefits in terms of infection control, economic considerations, and ease of reprocessing. A few drawbacks are left to be dealt with. Reusable duodenoscopes with removable/disposable endcaps are satisfactory except in specific situations where SUDs are better to use.

Single-use endoscopes: A narrative review

Maged Tharwat Elghannam,Moataz Hassan Hassanien,Yosry Abdelrahman Ameen,Gamal Mohammed Elattar,Ahmed Ali El Ray,Emad Abdel Wahab Turky,Mohammed Darwish El Talkawy 소화기인터벤션의학회 2022 International journal of gastrointestinal interven Vol.11 No.1

The transmission of infections through gastrointestinal endoscopy is a vital issue. The main problem lies in the use of duodenoscopes due to mechanical aspects of the scope design. Even with high-level disinfection, sterilization of the scope can fail. Hence, the Food and Drug Administration has encouraged a shift to single-use endoscopes. Available options include endoscopes with single-use components (mainly single-use endcaps), fully single-use duodenoscopes (SUDs), and even those with a disposable elevator mechanism. Clinical trials revealed that both reusable and single-use scopes have the same efficacy, while single-use scopes have benefits in terms of infection control, economic considerations, and ease of reprocessing. A few drawbacks are left to be dealt with. Reusable duodenoscopes with removable/disposable endcaps are satisfactory except in specific situations where SUDs are better to use.

Dual modification of hematite photoanode by Sn-doping and Nb₂O₅ layer for water oxidation

Jeon, Tae Hwa,Bokare, Alok D.,Han, Dong Suk,Abdel-Wahab, Ahmed,Park, Hyunwoong,Choi, Wonyong Elsevier 2017 Applied catalysis. B, Environmental Vol.201 No.-

<P><B>Abstract</B></P> <P>Porous hematite (α-Fe<SUB>2</SUB>O<SUB>3</SUB>) films doped with Sn(IV) and coated with an ultrathin (∼2nm thick) Nb<SUB>2</SUB>O<SUB>5</SUB> passivation layer were synthesized, and the photoelectrochemical (PEC) water oxidation performance and durability of the hematite were examined in detail. As compared to hematite samples modified by either doping or passivation, dual-modified hematite exhibited a promising PEC water oxidation performance under AM 1.5 irradiation. A stable photocurrent was maintained under prolonged irradiation over 24h, while O<SUB>2</SUB> was produced from water with a Faradaic efficiency of over 80% without showing any sign of deactivation. This performance and durability could be decoupled into separate effects of Sn doping and Nb<SUB>2</SUB>O<SUB>5</SUB> layer via in-depth surface characterization and electrochemical analyses. Sn doping increased the donor density (<I>N</I> <SUB>d</SUB>) of bare hematite by a factor of 20 and significantly improved its conductivity, leading to enhanced charge transfer efficiency. The Nb<SUB>2</SUB>O<SUB>5</SUB> layer exerted an effect similar to Sn doping because of the diffusion of a fraction of Nb(V) into the hematite lattice during the annealing process at 700°C. The primary effect of the Nb<SUB>2</SUB>O<SUB>5</SUB> layer is to passivate the hematite surface and make the surface more reactive toward the oxygen evolution through water oxidation. These effects are synergistically combined in the dual-modified hematite electrode.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hematite doped with Sn(IV) and coated with an ultrathin Nb<SUB>2</SUB>O<SUB>5</SUB> layer are synthesized. </LI> <LI> Dual-modified hematite exhibits remarkably high photoelectrochemical efficiencies. </LI> <LI> A stable photocurrent is maintained under prolonged irradiation over 24h. </LI> <LI> O<SUB>2</SUB> is linearly produced from water with an efficiency of >80% without deactivation. </LI> <LI> The effect is in-depth studied in terms of charge separation and injection. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>