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Refat, Moamen S.,Mohamed, Gehad G.,Fathi, Ahmed Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.6
Spectrophotometric micro determination of allopurinol (ALP) via charge-transfer formation is described. This includes the utility of some $\pi$-acceptors such as 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) and 3,6-dichloro-2,5-dihydroxy-p-benzoquinone (p-CLA) for estimation of ALP drug (act as $\grave{e}$-donor). These reactions are applied for determination of ALP in its pharmaceutical preparations coming from different companies. Elucidation of the chemical structure of the solid CT complexes formed via reaction between drugs under study and $\pi$-acceptors, using elemental analyses (C, H, N), I. R., $^1H$ NMR and mass spectrometry.
Moamen S. Refat,Gehad G. Mohamed,Ahmed Fathi 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.6
Spectrophotometric micro determination of allopurinol (ALP) via charge-transfer formation is described. This includes the utility of some π-acceptors such as 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) and 3,6-dichloro-2,5-dihydroxy-p-benzoquinone (p-CLA) for estimation of ALP drug (act as è-donor). These reactions are applied for determination of ALP in its pharmaceutical preparations coming from different companies. Elucidation of the chemical structure of the solid CT complexes formed via reaction between drugs under study and π-acceptors, using elemental analyses (C, H, N), I. R., 1H NMR and mass spectrometry.
Tamer Awad Ali,Gehad G. Mohamed,M.M. Omar,Noha M. Hanafy 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
The construction, performance characteristics and application of Co(II)-chemically modified carbon paste electrodes (CMCPEs) based on bis(salicylaldehyde)-o-phenylenediamine (Schiff base I, SalophH2; ionophore A), N-salicylidene-o-aminophenol (Schiff base II, SaphH2, ionophore B), [Co(Saloph)] complex (ionophore C) and [Co(Saph)OH2] complex (ionophore D) are reported in this paper. The CMCPEs are prepared by incorporating of A–D ionophores into a plasticized carbon paste electrodes to form electrodes I–IV sensors, respectively. The prepared electrodes exhibit Nernstian slope of 29.20 ± 1.13, 28.20 ± 2.07, 29.90 ± 0.26 and 28.80 ± 1.04 mV decade−1 towards Co(II) ion over a wide concentration range of 1.0 × 10−7–1.0 × 10−2, 7.9 × 10−7–1.0 × 10−2, 4.9 × 10−8–1.0 × 10−2 and 5.1 × 10−7–1.0 × 10−2 mol L−1 with a detection limit of 1.0 × 10−7, 7.9 × 10−7, 4.9 × 10−8 and 5.1 × 10−7 mol L−1 at pH range 3.0–8.0, 3.5–7, 2.0–8.0 and 2.5–7.5 for electrodes I–IV, respectively. The electrodes showed good selectivity for Co(II) ion toward a wide variety of metal ions. The proposed electrodes were successfully applied for the determination of Co(II) ion in real spiked water samples and the results obtained compared well with those obtained using inductively coupled plasma atomic emission spectrometry (ICP-AAS).
Tamer Awad Ali,Ahmed A. Farag,Gehad G. Mohamed 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
This article is focused on the determination of Fe(III) ion as an important factor in water pollution. A potentiometric method based on screen-printed ion-selective electrode was described for the determination of Fe(III) ion in different polluted water samples. It is based on incorporation of the Fe-phosphotungstate ion-associate in a screen-printed electrode (SPE) composition and tricresylpho-sphate (TCP) as plasticizer. The influences of the paste composition, different conditioning parameters and foreign ions on the electrode performance were investigated. The reversibility and also response time of the electrode have been studied. The electrode showed Nernstian response of 19.20 ± 0.73 mV decade-1 in the concentration range of 1 × 10-7–2.5 × 10-2 mol L-1. The electrode was found to be usable within the pH range of 3–7.5 and exhibited a fast response time (about 7 s), low detection limit (1.57 × 10-7 mol L-1), long lifetime (>6 months) and good stability. The isothermal temperature coefficient (dE0/dt) of the electrode was calculated. The electrode was successfully applied for the determination of Fe(III) ion in pure solutions and polluted water samples (formation, tab and sea water samples) using potentiometric determination technique. The results obtained applying this potentiometric electrode is comparable with those obtained using inductive coupled plasma technique.
Suzan Ahmed Elfiky,Shwikar Mahmoud Ahmed,Ahmed Mostafa Elmenshawy,Gehad Mahmoud Sultan,Sara Lotfy Asser 대한중환자의학회 2023 Acute and Critical Care Vol.38 No.1
Background Hospital-acquired infections (HAIs) are increasing due to the spread of multi-drug-resistant organisms. Gut dysbiosis in an intensive care unit (ICU) patients at admission showed an altered abundance of some bacterial genera associated with the occurrence of HAIs and mortality. In the present study, we investigated the pattern of the gut microbiome in ICU patients at admission to correlate it with the development of HAIs during ICU stay. Methods Twenty patients admitted to an ICU with a cross-matched control group of 30 healthy subjects of matched age and sex. Quantitative SYBR green real-time polymerase chain reaction was done for the identification and quantitation of selected bacteria. Results Out of those twenty patients, 35% developed ventilator-associated pneumonia during their ICU stay. Gut microbiome analysis showed a significant decrease in Firmicutes and Firmicutes to Bacteroidetes ratio in ICU patients in comparison to the control and in patients who developed HAIs in comparison to the control group and patients who did not develop HAIs. There was a statistically significant increase in Bacteroides in comparison to the control group. There was a statistically significant decrease in Bifidobacterium and Faecalibacterium prausnitzii and an increase in Lactobacilli in comparison to the control group with a negative correlation between Acute Physiology and Chronic Health Evaluation (APACHE) II score and Firmicutes to Bacteroidetes and Prevotella to Bacteroides ratios. Conclusions Gut dysbiosis of patients at the time of admission highlights the importance of identification of the microbiome of patients admitted at the ICU as a target for preventing of HAIs.
Survival of tissue-resident memory T cells requires exogenous lipid uptake and metabolism
Pan, Youdong,Tian, Tian,Park, Chang Ook,Lofftus, Serena Y.,Mei, Shenglin,Liu, Xing,Luo, Chi,O’Malley, John T.,Gehad, Ahmed,Teague, Jessica E.,Divito, Sherrie J.,Fuhlbrigge, Robert,Puigserver, Pere,Kru Macmillan Publishers Limited, part of Springer Nat 2017 Nature Vol.543 No.7644
Tissue-resident memory T (T<SUB>RM</SUB>) cells persist indefinitely in epithelial barrier tissues and protect the host against pathogens. However, the biological pathways that enable the long-term survival of T<SUB>RM</SUB> cells are obscure. Here we show that mouse CD8<SUP>+</SUP> T<SUB>RM</SUB> cells generated by viral infection of the skin differentially express high levels of several molecules that mediate lipid uptake and intracellular transport, including fatty-acid-binding proteins 4 and 5 (FABP4 and FABP5). We further show that T-cell-specific deficiency of Fabp4 and Fabp5 (Fabp4/Fabp5) impairs exogenous free fatty acid (FFA) uptake by CD8<SUP>+</SUP> T<SUB>RM</SUB> cells and greatly reduces their long-term survival in vivo, while having no effect on the survival of central memory T (T<SUB>CM</SUB>) cells in lymph nodes. In vitro, CD8<SUP>+</SUP> T<SUB>RM</SUB> cells, but not CD8<SUP>+</SUP> T<SUB>CM</SUB> cells, demonstrated increased mitochondrial oxidative metabolism in the presence of exogenous FFAs; this increase was not seen in Fabp4/Fabp5 double-knockout CD8<SUP>+</SUP> T<SUB>RM</SUB> cells. The persistence of CD8<SUP>+</SUP> T<SUB>RM</SUB> cells in the skin was strongly diminished by inhibition of mitochondrial FFA β-oxidation in vivo. Moreover, skin CD8<SUP>+</SUP> T<SUB>RM</SUB> cells that lacked Fabp4/Fabp5 were less effective at protecting mice from cutaneous viral infection, and lung Fabp4/Fabp5 double-knockout CD8<SUP>+</SUP> T<SUB>RM</SUB> cells generated by skin vaccinia virus (VACV) infection were less effective at protecting mice from a lethal pulmonary challenge with VACV. Consistent with the mouse data, increased FABP4 and FABP5 expression and enhanced extracellular FFA uptake were also demonstrated in human CD8<SUP>+</SUP> T<SUB>RM</SUB> cells in normal and psoriatic skin. These results suggest that FABP4 and FABP5 have a critical role in the maintenance, longevity and function of CD8<SUP>+</SUP> T<SUB>RM</SUB> cells, and suggest that CD8<SUP>+</SUP> T<SUB>RM</SUB> cells use exogenous FFAs and their oxidative metabolism to persist in tissue and to mediate protective immunity.
Human Platelet Antigen Datasets for Malays, Chinese, and Indians in Peninsular Malaysia
Che Ghazali Norul Hajar,Zulkifli Zefarina,Nor Suhaila Md. Riffin,Tuan Hulwani Tuan Mohammad,Mohd Nazri Hassan,Ameer Mohamed Dafalla,Gehad ElGhazali,Geoffrey Keith Chambers,Hisham Atan Edinur 대한진단검사의학회 2020 Annals of Laboratory Medicine Vol.40 No.6