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Article ; Online: A fast and simple SPE-LC-MS/MS procedure for extraction and quantitative analysis of 1,2,4-triazole, N,N-dimethylsulfamide, and other small polar organic compounds in groundwater.

Bollmann, Ulla E / Badawi, Nora

2020 Volume 412, Issue 23, Page(s) 5683–5693

Abstract: ... as they often are highly mobile and persistent in the environment. 1,2,4-Triazole and N,N-dimethylsulfamide, two ... Carb Plus cartridges. With extraction recoveries close to 100% for 1,2,4-triazole and N,N ...

Abstract	Small polar organic pollutants have been discovered to be great threats to the groundwater' as they often are highly mobile and persistent in the environment. 1,2,4-Triazole and N,N-dimethylsulfamide, two well-known examples of small polar compounds, are frequent pollutants of upper groundwater. Both are degradation products of several fungicides commonly or previously used in agriculture' but also in wood-preserving paints. A common trait in the analysis of these small polar compounds is the lack of sufficient pre-concentration methods to lower the limit of detection and enable quantitative analysis at nano-scale concentrations. To date, they are analyzed only by direct injection in HPLC-MS/MS, with detection limits just below the European threshold value for pesticides in groundwater of 0.1 μg/L. Based on a comprehensive method development, a solid phase extraction method was developed. As known LC methods for analysis of 1,2,4-triazole are based on Thermo Fisher's Hypercarb column, emphasis was placed on testing various carbon-based materials. The final, thoroughly validated extraction protocol is based on Supelco's ENVI-Carb Plus cartridges. With extraction recoveries close to 100% for 1,2,4-triazole and N,N-dimethylsulfamide and quantification limits of around 0.003 μg/L, the method enables extraction and quantification of polar pollutants at nano-scale concentration from groundwater samples. In addition, the method is very promising to be used for other small polar pollutants. Graphical abstract.
Language	English
Publishing date	2020-07-09
Publishing country	Germany
Document type	Journal Article
ZDB-ID	201093-8
ISSN	1618-2650 ; 0016-1152 ; 0372-7920
ISSN (online)	1618-2650
ISSN	0016-1152 ; 0372-7920
DOI	10.1007/s00216-020-02788-1
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Article ; Online: Règlementation pharmaceutique au Tchad: état de lieux des pratiques de délivrance des médicaments dans les officines privées de N’Djaména.

Gueralbaye, Levy Ouribe / Zongo, Luc / Zongo, Ragomzingba Frank Edgard / Mahamat, Haroun Badawi / Ouédraogo, Arsène / Avocksouma, Djona Atchenemou

The Pan African medical journal

2023 Volume 44, Page(s) 16

Abstract: Introduction: the purpose of this study was to evaluate drug dispensing practices in private pharmacies in the city of N'Djamena and, specifically, (I) to describe the characteristics of dispensaries, (ii) describe dispensing practices and (iii) assess ... ...

Title translation	Pharmaceutical regulations in Chad: assessment of drug dispensing practices in private pharmacies in N'Djamena.
Abstract	Introduction: the purpose of this study was to evaluate drug dispensing practices in private pharmacies in the city of N'Djamena and, specifically, (I) to describe the characteristics of dispensaries, (ii) describe dispensing practices and (iii) assess regulatory compliance when dispensing on the basis of a prescription and an advice. Methods: we conducted a cross-sectional survey from June to December 2020. Data were collected in two stages, through interviews with pharmacists and participant observation in drug delivery practices in pharmacies. Results: in total, 26 pharmacies, or 50% of pharmacies in N'Djamena, were surveyed. The main survey findings were: private pharmacies in the city of N'Djamena employed two categories of staff, namely pharmacists and auxiliary staff (pharmacy technicians, nurses and salespeople or staff with "no health qualifications". These had not been trained in a health school recognised by the Ministry of Health) to dispense medicines. Very few pharmacies (8%) had a customer confidentiality area and a order book. The three modes of delivery were observed in more or less equal proportions (30 to 40% of dispensations). Dispensing at the patient's request was slightly predominant (40%) and the majority of medicines dispensed at the patient's request and based on dispenser's advice belonged to the different tables of toxic substances (over 70%). The noted absence of the pharmacist from the pharmacy justified why 84% of patients' requests were addressed to the pharmacy assistants. Conclusion: this study shows low compliance of pharmacies with pharmaceutical regulations for proper dispensing of medicines in the city of N'Djamena. Factors related to pharmaceutical sector governance and human resources management as well as therapeutic patient education could explain this gap.
MeSH term(s)	Humans ; Pharmacies ; Pharmaceutical Preparations ; Cross-Sectional Studies ; Chad ; Pharmacists ; Community Pharmacy Services ; Pharmacy
Chemical Substances	Pharmaceutical Preparations
Language	French
Publishing date	2023-01-09
Publishing country	Uganda
Document type	English Abstract ; Journal Article
ZDB-ID	2514347-5
ISSN	1937-8688 ; 1937-8688
ISSN (online)	1937-8688
ISSN	1937-8688
DOI	10.11604/pamj.2023.44.16.37835
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Article ; Online: Controlling barrier height and spectral responsivity of p-i-n based GeSn photodetectors

Nawwar, Mohamed A / Abo Ghazala, Magdy S / Sharaf El-Deen, Lobna M / Anis, Badawi / El-Shaer, Abdelhamid / Elseman, Ahmed Mourtada / Rashad, Mohamed M / Kashyout, Abd El-Hady B

RSC advances

2023 Volume 13, Issue 14, Page(s) 9154–9167

Abstract: ... the cut off wavelength. In the present article, p-i-n structures based on GeSn junctions were fabricated ... to serve as PDs. Arsine (As) is incorporated to develop n-GeSn compounds ...

Abstract	GeSn compounds have made many interesting contributions in photodetectors (PDs) over the last ten years, as they have a detection limit in the NIR and mid-IR region. Sn incorporation in Ge alters the cut off wavelength. In the present article, p-i-n structures based on GeSn junctions were fabricated to serve as PDs. Arsine (As) is incorporated to develop n-GeSn compounds
Language	English
Publishing date	2023-03-20
Publishing country	England
Document type	Journal Article
ISSN	2046-2069
ISSN (online)	2046-2069
DOI	10.1039/d3ra00805c
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Article ; Online: Correction: Controlling barrier height and spectral responsivity of p-i-n based GeSn photodetectors

Nawwar, Mohamed A / Abo Ghazala, Magdy S / Sharaf El-Deen, Lobna M / Anis, Badawi / El-Shaer, Abdelhamid / Elseman, Ahmed Mourtada / Rashad, Mohamed M / Kashyout, Abd El-Hady B

RSC advances

2023 Volume 13, Issue 21, Page(s) 14472

Abstract: This corrects the article DOI: 10.1039/D3RA00805C.]. ...

Abstract	[This corrects the article DOI: 10.1039/D3RA00805C.].
Language	English
Publishing date	2023-05-11
Publishing country	England
Document type	Published Erratum
ISSN	2046-2069
ISSN (online)	2046-2069
DOI	10.1039/d3ra90040a
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Article: A fast and simple SPE-LC-MS/MS procedure for extraction and quantitative analysis of 1,2,4-triazole, N,N-dimethylsulfamide, and other small polar organic compounds in groundwater

Bollmann, Ulla E / Badawi, Nora

Analytical and bioanalytical chemistry. 2020 Sept., v. 412, no. 23

2020

Abstract	Small polar organic pollutants have been discovered to be great threats to the groundwater‚ as they often are highly mobile and persistent in the environment. 1,2,4-Triazole and N,N-dimethylsulfamide, two well-known examples of small polar compounds, are frequent pollutants of upper groundwater. Both are degradation products of several fungicides commonly or previously used in agriculture‚ but also in wood-preserving paints. A common trait in the analysis of these small polar compounds is the lack of sufficient pre-concentration methods to lower the limit of detection and enable quantitative analysis at nano-scale concentrations. To date, they are analyzed only by direct injection in HPLC-MS/MS, with detection limits just below the European threshold value for pesticides in groundwater of 0.1 μg/L. Based on a comprehensive method development, a solid phase extraction method was developed. As known LC methods for analysis of 1,2,4-triazole are based on Thermo Fisher’s Hypercarb column, emphasis was placed on testing various carbon-based materials. The final, thoroughly validated extraction protocol is based on Supelco’s ENVI-Carb Plus cartridges. With extraction recoveries close to 100% for 1,2,4-triazole and N,N-dimethylsulfamide and quantification limits of around 0.003 μg/L, the method enables extraction and quantification of polar pollutants at nano-scale concentration from groundwater samples. In addition, the method is very promising to be used for other small polar pollutants. Graphical abstract
Keywords	analytical chemistry ; detection limit ; groundwater ; quantitative analysis ; solid phase extraction
Language	English
Dates of publication	2020-09
Size	p. 5683-5693.
Publishing place	Springer Berlin Heidelberg
Document type	Article
ISSN	1618-2642
DOI	10.1007/s00216-020-02788-1
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: A comparative study of the structure and vibrational spectra of diphenylmethane, the carcinogen 4,4'-methylenedianiline and 4,4'-methylenebis(N,N-dimethylaniline).

Badawi, Hassan M

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy

2013 Volume 109, Page(s) 213–220

Abstract: The structural stability of 4,4'-methylenedianiline (MDA), 4,4'-methylenebis(N,N-dimethylaniline ...

Abstract	The structural stability of 4,4'-methylenedianiline (MDA), 4,4'-methylenebis(N,N-dimethylaniline) (MBDMA) and their parent diphenylmethane (DPM) was investigated by the DFT-B3LYP and ab initio MP2 calculations with the 6-311G(**) basis set. From the calculations the three diphenylmethanes were predicted to exist predominantly in a non-planar structure with a near C2 molecular symmetry in agreement with X-ray studies. The CCCC angles in DPM and the two dianilines were calculated to be nearly equal of about 60° as compared to X-ray angles of 17° and 67° for MDA. The NH2 inversion barriers in MDA was estimated to be about 1-5 kcal/mol. On comparison of the Raman spectra of the three compounds, the line intensity and position of the characteristic ring breathing mode were shown to be sensitive to the amino substitution. The vibrational wavenumbers of the optimized structures of the two dianilines were computed at the DFT-B3LYP level of theory. Tentative vibrational assignments were made on the basis of combined DFT and experimental FT-IR and FT-Raman data of MDA and MBDMA.
MeSH term(s)	Aniline Compounds/chemistry ; Benzhydryl Compounds/chemistry ; Carcinogens/chemistry ; Models, Molecular ; Spectroscopy, Fourier Transform Infrared ; Spectrum Analysis, Raman
Chemical Substances	4,4'-methylenebis(N,N'-dimethyl)aniline ; Aniline Compounds ; Benzhydryl Compounds ; Carcinogens ; 4,4'-diaminodiphenylmethane (GG5LL7OBZC) ; diphenylmethane (K3E387I0BC)
Language	English
Publishing date	2013-05-15
Publishing country	England
Document type	Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	210413-1
ISSN	1873-3557 ; 0370-8322 ; 0584-8539 ; 1386-1425
ISSN (online)	1873-3557
ISSN	0370-8322 ; 0584-8539 ; 1386-1425
DOI	10.1016/j.saa.2013.02.030
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Book ; Online: Novel Wastewater Treatment Applications Using Polymeric Materials

Fahim, Irene S / Badawi, Ahmed K / Emam, Hossam E

2023

Keywords	Chemistry ; Technology: general issues ; cyanoguanidine-modified chitosan adsorbent ; Congo red dye ; adsorption kinetics ; adsorption isotherms ; adsorption thermodynamic ; Nelumbo nucifera leaf adsorbent ; fixed-bed column ; immobilization ; breakthrough curve ; desorption ; polymer complexant ; rare earth separation ; phosphorylated chitosan ; complexation-ultrafiltration ; kinetic study ; Eucalyptus ; biochar ; arsenic ; fluoride ; methylene blue ; activated carbon ; agro-waste ; wastewater ; adsorption ; cationic dyes ; low-cost adsorbents ; bio-waste ; Sargassum latifolium ; methylene blue dye ; water pollution ; equilibrium isotherm ; plasma ; produced water ; membranes ; desalination ; gliding arc ; nanofiltration ; nanofibers ; ROMP ; thiol-functionalized polymer ; polynorbornene dicarboximide ; heavy metal adsorption ; lead ; cadmium ; nickel ; fabrication techniques ; inorganic contaminants ; organic pollutants ; polymer nanocomposites ; water treatment ; polyamine ; industrial wastewater treatment ; heavy metal ions ; hypercrosslinked polymer ; porous polymer ; catechol ; Fenton catalyst ; dye degradation ; nanofilter ; nanocomposite ; water ; purification ; capillary-driven flow ; biocompatible ; biodegradable ; Ismate violet 2R dye ; IV2R ; ZnO-NP ; BET ; kinetics ; isotherm modelling ; thermodynamic ; poly(N-isopropylacrylamide) (PNIPAAm) ; thermo-responsive membrane ; hydrophilic hydrogel support ; interfacial polymerization ; electrospun nanofibers ; polyethylene terephthalate ; superhydrophobic nanosilica ; solid-phase microextraction ; organochlorine pesticides ; electrospun-nanofibers ; Calix[4]arene ; polyurethane ; polysulfone ; extraction ; chlorobenzenes ; heavy metals ; environmental remediation ; polyaniline ; coconut fiber ; electrospinning ; nickel titanate ; photodegradation ; mathematical modeling
Language	English
Size	1 electronic resource (354 pages)
Publisher	MDPI - Multidisciplinary Digital Publishing Institute
Publishing place	Basel
Document type	Book ; Online
Note	English
HBZ-ID	HT030379142
ISBN	9783036562445 ; 3036562443
Database	ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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Article ; Online: Styrene N-vinylpyrrolidone metal-nanocomposites as antibacterial coatings against Sulfate Reducing Bacteria.

Fathy, M / Badawi, A / Mazrouaa, A M / Mansour, N A / Ghazy, E A / Elsabee, M Z

Materials science & engineering. C, Materials for biological applications

2013 Volume 33, Issue 7, Page(s) 4063–4070

Abstract: Copolymer of styrene, and vinylpyrrolidone was prepared by various techniques. Different nanometals and nanometal oxides were added into the copolymer as antimicrobial agents against Sulfate Reducing Bacteria (SRB). The nanocomposite chemical structure ... ...

Abstract	Copolymer of styrene, and vinylpyrrolidone was prepared by various techniques. Different nanometals and nanometal oxides were added into the copolymer as antimicrobial agents against Sulfate Reducing Bacteria (SRB). The nanocomposite chemical structure was confirmed by using FTIR, (1)H NMR spectroscopy and thermogravimetric analysis (TGA). The biocidal action of these nanocomposites against the SRB was detected using sulfide determination method in Postgate medium B. The data indicated that the nanocomposites had an inhibitory effect on the growth of SRB and reduced the bacterial corrosion rate of mild steel coupons. The prepared nanocomposites have high inhibition efficiency when applied as coatings and show less efficiency when applied as solids or solution into SRB medium. The copolymer and its nanocomposites effectively reduced the total corrosion rate as determined by total weight loss method.
MeSH term(s)	Anti-Bacterial Agents/pharmacology ; Bacteria/drug effects ; Chromatography, Gel ; Coated Materials, Biocompatible/pharmacology ; Corrosion ; Magnetic Resonance Spectroscopy ; Metals/pharmacology ; Microbial Sensitivity Tests ; Molecular Weight ; Nanocomposites/chemistry ; Nanocomposites/ultrastructure ; Oxidation-Reduction/drug effects ; Particle Size ; Pyrrolidinones/chemistry ; Pyrrolidinones/pharmacology ; Spectroscopy, Fourier Transform Infrared ; Styrene/chemistry ; Styrene/pharmacology ; Sulfates/metabolism ; Surface Properties ; Thermogravimetry
Chemical Substances	Anti-Bacterial Agents ; Coated Materials, Biocompatible ; Metals ; Pyrrolidinones ; Sulfates ; Styrene (44LJ2U959V) ; N-vinyl-2-pyrrolidinone (76H9G81541)
Language	English
Publishing date	2013-10
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	2012160-X
ISSN	1873-0191 ; 0928-4931
ISSN (online)	1873-0191
ISSN	0928-4931
DOI	10.1016/j.msec.2013.05.048
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Article ; Online: Biological study of the effect of water soluble [N-(2-hydroxybenzyl)-L-aspartato] gallium complexes on breast carcinoma and fibrosarcoma cells.

Mohsen, Ahmed / Saby, Charles / Collery, Philippe / Sabry, Gilane Mohamed / Hassan, Rasha Elsherif / Badawi, Abdelfattah / Jeannesson, Pierre / Desmaële, Didier / Morjani, Hamid

Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry

2016 Volume 21, Issue 7, Page(s) 837–849

Abstract: ... of N-2-hydroxybenzyl aspartic acid derivatives, were synthesized and characterized by (1)H NMR, (13)C ...

Abstract	Two water soluble gallium complexes described as [Ga(III)LCl], where L is the deprotonated form of N-2-hydroxybenzyl aspartic acid derivatives, were synthesized and characterized by (1)H NMR, (13)C NMR, FT-IR, mass spectrometry, and elemental analysis. The 2-(5-chloro-2-hydroxybenzylamino)succinic acid derivative (GS2) has been found to be a promising anticancer drug candidate. This compound was found to be more cytotoxic against human breast carcinoma MDA-MB231 and fibrosarcoma HT-1080 cell lines than the unsubstituted derivative and GaCl3. GS2 was able to induce apoptosis through downregulation of AKT phosphorylation, G2M arrest in cell cycle, and caspase 3/7 pathway. This gallium complex was found to induce an increase in mitochondrial ROS level in HT-1080 cells but not in MDA-MB231 cells. This suggests that the mechanism of action of GS2 would not be mediated by the drug-induced oxidative stress but probably by directly and indirectly inhibiting the AKT cell-signaling pathway.
MeSH term(s)	Antineoplastic Agents/chemistry ; Antineoplastic Agents/pharmacology ; Apoptosis/drug effects ; Aspartic Acid/chemistry ; Breast Neoplasms/pathology ; Caspase 3/metabolism ; Caspase 7/metabolism ; Cell Cycle Checkpoints/drug effects ; Cell Line, Tumor ; Cell Proliferation/drug effects ; Cell Survival/drug effects ; Fibrosarcoma/pathology ; G2 Phase Cell Cycle Checkpoints/drug effects ; Gallium/chemistry ; Humans ; M Phase Cell Cycle Checkpoints/drug effects ; Membrane Potential, Mitochondrial/drug effects ; Mitochondria/drug effects ; Mitochondria/metabolism ; Organometallic Compounds/chemistry ; Organometallic Compounds/pharmacology ; Phosphorylation/drug effects ; Proto-Oncogene Proteins c-akt/metabolism ; Reactive Oxygen Species/metabolism ; Solubility ; Water/chemistry
Chemical Substances	Antineoplastic Agents ; Organometallic Compounds ; Reactive Oxygen Species ; Water (059QF0KO0R) ; Aspartic Acid (30KYC7MIAI) ; Gallium (CH46OC8YV4) ; Proto-Oncogene Proteins c-akt (EC 2.7.11.1) ; Caspase 3 (EC 3.4.22.-) ; Caspase 7 (EC 3.4.22.-)
Language	English
Publishing date	2016-08-02
Publishing country	Germany
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1464026-0
ISSN	1432-1327 ; 0949-8257
ISSN (online)	1432-1327
ISSN	0949-8257
DOI	10.1007/s00775-016-1382-7
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Article: Structural stability, C--N internal rotations and vibrational spectral analysis of non-planar phenylurea and phenylthiourea.

Badawi, Hassan M

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy

2009 Volume 72, Issue 3, Page(s) 523–527

Abstract: The structural stability and C-N internal rotations of phenylurea and phenylthiourea were ...

Abstract	The structural stability and C-N internal rotations of phenylurea and phenylthiourea were investigated by DFT-B3LYP and ab initio MP2 and MP4//MP2 calculations with 6-311G and/or 6-311+G basis sets. The complex multirotor internal rotations in phenylurea and phenylthiourea were investigated at the B3LYP/6-311+G** level of theory from which several clear minima were predicted in the calculated potential energy scans of both molecules. For phenylurea two minima that correspond to non-planar- (CNCC dihedral angle of about 45 degrees ) cis (CNCO dihedral angle is near 0 degrees ) and trans (CNCO dihedral angle is near 180 degrees ) structures were predicted to have real frequency. For phenylthiourea only the non-planar-trans structure was predicted to be the low energy minimum for the molecule. The vibrational frequencies of the lowest energy non-planar-trans conformer of each of the two molecules were computed at the B3LYP level and tentative vibrational assignments were provided on the basis of normal coordinate analysis and experimental infrared and Raman data.
MeSH term(s)	Molecular Conformation ; Molecular Structure ; Phenylthiourea/chemistry ; Phenylurea Compounds/chemistry ; Rotation ; Spectrophotometry, Infrared ; Spectrum Analysis ; Vibration
Chemical Substances	Phenylurea Compounds ; Phenylthiourea (6F82C6Q54C)
Language	English
Publishing date	2009-04
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	210413-1
ISSN	1873-3557 ; 1386-1425 ; 0370-8322 ; 0584-8539
ISSN (online)	1873-3557
ISSN	1386-1425 ; 0370-8322 ; 0584-8539
DOI	10.1016/j.saa.2008.10.042
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