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RISS 인기검색어
- 검색키워드
- 저자 : Attwa, Mohamed W. (검색결과 3 건)
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Dina Eskandere,Hazem Hakim,Magdy Attwa,Wagdi Elkashef,Ahmed Youssef Altonbary 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.5
Background/Aims: Malignant portal vein thrombus (PVT) is found in up to 44% of patients with hepatocellular carcinoma (HCC). The nature of the thrombus influences treatment selection. The aim of this study was to assess the safety and efficacy of endoscopicultrasound-guided fine-needle aspiration (EUS-FNA) in determining the nature of PVT in liver cirrhosis and/or HCC. Methods: A prospective study was conducted in 34 patients with liver cirrhosis and/or HCC with PVT. Under EUS guidance, PVTwas punctured using a 22 G FNA needle (Cook Medical, Bloomington, IN, USA) followed by monitoring of the puncture tract usingcolor Doppler. Patients were followed for adverse events 2 hours after recovery. Results: Throughout the 30-month study period, 34 patients, including 24 males with a mean age of 59±8 years, were enrolled. There were 8 patients with known HCC and 26 with no liver masses detected by computed tomography (CT). EUS-FNA from PVTwas positive for malignancy in 3 patients (8.8%), of which only 1 patient was diagnosed with HCC by CT and 2 patients were newlydiagnosed with HCC after EUS-FNA. No major complications were reported. Conclusions: EUS-FNA is a safe and effective technique for determining the nature of PVT that does not fulfill the malignant criteriavia imaging studies in patients with liver cirrhosis and/or HCC.
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Fragmentation Behavior Studies of Chalcones Employing Direct Analysis in Real Time (DART)
Motiur Rahman, A.F.M.,Attwa, Mohamed W.,Ahmad, Pervez,Baseeruddin, Mohammad,Kadi, Adnan A. Korean Society for Mass Spectrometry 2013 Mass spectrometry letters Vol.4 No.2
Chalcones are naturally occurring, biologically active molecules generating interest from a wide range of research applications including synthetic methodology development, biological activity investigation and studying fragmentation patterns. In this article, a series of chalcones has been synthesized and their fragmentation behavior was studied using modern ambient ionization technique Direct Analysis in Real Time (DART). DART ion source connected with an ion trap mass spectrometer was used for the fragmentation of various substituted chalcones. The chalcones were introduced to the DART source using a glass capillary without sample preparation step. All the chalcones showed prominent molecular ion peaks $[M]^{{\cdot}+}$ corresponding to the structures. Multistage mass spectral data $MS^n$ ($MS^2$ and $MS^3$) were collected for all the chalcones studied. The chalcones with substitutions at 3, 4 or 5 positions gave product ion peaks with the loss of a phenyl radical ($Ph^{\cdot}$) by radical initiated ${\alpha}$-cleavage, while substitution at 2 position of chalcone in the A-ring gave a product ion peak with the loss of substituted styryl radical (PhCH = $CH^{\cdot}$). In case of the chalcones with the substituent at 4 positions in A and B rings gave both types of fragmentation patterns. In conclusion, chalcones can be easily characterized using modern DART interface in very short time and efficiently without any cumbersome sample pretreatment.
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Fragmentation Behavior Studies of Chalcones Employing Direct Analysis in Real Time (DART)
( A. F. M. Motiur Rahman ),( Mohamed W. Attwa ),( Pervez Ahmad ),( Mohammad Baseeruddin ),( Adnan A. Kadi ) 한국질량분석학회 2013 Mass spectrometry letters Vol.4 No.2
Chalcones are naturally occurring, biologically active molecules generating interest from a wide range of research applications including synthetic methodology development, biological activity investigation and studying fragmentation patterns. In this article, a series of chalcones has been synthesized and their fragmentation behavior was studied using modern ambient ionization technique Direct Analysis in Real Time (DART). DART ion source connected with an ion trap mass spectrometer was used for the fragmentation of various substituted chalcones. The chalcones were introduced to the DART source using a glass capillary without sample preparation step. All the chalcones showed prominent molecular ion peaks [M].+ corresponding to the structures. Multistage mass spectral data MSn (MS2 and MS3) were collected for all the chalcones studied. The chalcones with substitutions at 3, 4 or 5 positions gave product ion peaks with the loss of a phenyl radical (Ph.) by radical initiated α-cleavage, while substitution at 2 position of chalcone in the A-ring gave a product ion peak with the loss of substituted styryl radical (PhCH = CH.). In case of the chalcones with the substituent at 4 positions in A and B rings gave both types of fragmentation patterns. In conclusion, chalcones can be easily characterized using modern DART interface in very short time and efficiently without any cumbersome sample pretreatment.
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