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Endoscopic Ultrasound-guided drainage of an abdominal fluid collection following Whipple's resection

World Journal of Gastroenterology 2008年第44期14卷 6867-6868页

作者： Asif Jah Neville Jamieson Emmanuel Huguet William Griffi ths nicholas carroll Raaj Praseedom Department of Hepatobiliary and Transplant Surgery Addenbrooke's HospitalCambridge University Hospitals NHS Foundation TrustCambridge CB2 2QQUnited Kingdom Department of Gastroenterology and Hepatology Addenbrooke's HospitalCambridge University Hospitals NHS Foundation TrustCambridge CB2 2QQUnited Kingdom Department of Radiology Addenbrooke's HospitalCambridge University Hospitals NHS Foundation TrustCambridge CB2 2QQUnited Kingdom

Percutaneous aspiration and drainage of post-operative abdominal fluid collections is a well established standard technique. However,some fluid collections are not amenable to percutaneous drainage either due to location or the presence of surrounding visceral structures. Endoscopic Ultrasound (EUS) has been widely used for the drainage of pancreatitis-related abdominal fluid collections. However,there are no reports on the use of this technique in the post-operative setting. We report a case where the EUS-guided technique was used to drain a percutaneously inaccessible post-operative collection which had developed after Whipple's resection.

关键词： Endoscopic ultrasound Pancreatectomy Whipple's resection

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Integration of solid phase extraction with HILIC-MS/MS for analysis of free amino acids in source water

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Journal of Environmental Sciences 2022年第7期34卷 190-196页

作者： Junlang Qiu Caley Craven nicholas Wawryk Kristin carroll Xing-Fang Li Division of Analytical and Environmental Toxicology Department of Laboratory Medicine and PathologyUniversity of AlbertaEdmontonT6G 2G3Canada School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510006China

Amino acids(AAs) are prevalent in source water, particularly during spring run-off. Monitoring of amino acids in source water is desirable for water treatment plants(WTP) to indicate changes in source water quality. The objective of this study was to establish analytical procedures for reliable monitoring of amino acids in source water. Therefore, we examined two different methods, large volume inject(LVI) and solid phase extraction(SPE), for sample preparation prior to HILIC-MS/MS. The LVI-HILIC-MS/MS method can provide fast and sensitive detection for clean samples, but suffers from matrix effects, resulting in irreproducible separation and shortening column lifetime. We have demonstrated that SPE was necessary prior to HILIC-MS/MS to achieve reproducible and reliable quantification of AAs in source water. A natural heterocyclic amine 1-methyl-1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid(MTCCA) was also included in the method to indicate changes in other natural nitrogenous compounds in source water. The SPE-HILIC-MS/MS method was able to achieve limits of detection from 2.6-3400 ng/L for the amino acids and MTCCA with RSDs( n = 3) of 1.1%-4.8%. As well, retention times(RT) of the analytes were reproducible with variation less than 0.01 min( n = 3) through the entire project. We further applied the SPE-HILICMS/MS method to determine AAs in authentic source water samples collected from two drinking water treatment plants(WTPs) during the 2021 spring run-off season. The results support that the SPE-HILIC-MS/MS method does not require derivatization and can provide reliable, accurate, and robust analysis of AAs and MTCCA in source water, supporting future monitoring of source water quality.

关键词： Water analysis Disinfection byproducts Amino acids HPLC MS HILIC

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HDPairFinder:A data processing platform for hydrogen/deuterium isotopic labeling-based nontargeted analysis of trace-level amino-containing chemicals in environmental water

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Journal of Environmental Sciences 2024年第2期136卷 583-593页

作者： Tingting Zhao Kristin carroll Caley B.Craven nicholas J.P.Wawryk Shipei Xing Jian Guo Xing-Fang Li Tao Huan Department of Chemistry Faculty of ScienceUniversity of British ColumbiaVancouver Campus2036 Main MallVancouverBritish ColumbiaV6T 1Z1Canada Division of Analytical and Environmental Toxicology Department of Laboratory Medicine and PathologyFaculty of Medicine and DentistryUniversity of AlbertaEdmontonAlberta T6G 2G3Canada

The combination of hydrogen/deuterium(H/D)formaldehyde-based isotopic methyl labeling with solid-phase extraction and high-performance liquid chromatography–high resolution mass spectrometry(HPLC-HRMS)is a powerful analytical solution for nontargeted analysis of trace-level amino-containing chemicals in water *** the huge amount of chemical information generated in HPLC-HRMS analysis,identifying all possible H/Dlabeled amino chemicals presents a significant challenge in data *** address this,we designed a streamlined data processing pipeline that can automatically extract H/D-labeled amino chemicals from the raw HPLC-HRMS data with high accuracy and ***,we developed a cross-correlation algorithm to correct the retention time shift resulting from deuterium isotopic effects,which enables reliable pairing of H-and D-labeled ***,we implemented several bioinformatic solutions to remove false chemical features generated by in-source fragmentation,salt adduction,and natural13C ***,we used a data mining strategy to construct the AMINES library that consists of over 38,000 structure-disjointed primary and secondary amines to facilitate putative compound ***,we integrated these modules into a freely available R program,*** rationale of each module was justified and its performance tested using experimental H/D-labeled chemical standards and authentic water *** further demonstrated the application of HDPairFinder to effectively extract N-containing contaminants,thus enabling the monitoring of changes of primary and secondary N-compounds in authentic water *** is a reliable bioinformatic tool for rapid processing of H/D isotopic methyl labeling-based nontargeted analysis of water samples,and will facilitate a better understanding of N-containing chemical compounds in water.

关键词： Isotope labeling Nontargeted analysis Reactive N-compounds HPLC-HRMS Source water

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Influence of laser polarization on collective electron dynamics in ultraintense laser-foil interactions

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High Power Laser Science and Engineering 2016年第3期4卷 120-126页

作者： Bruno Gonzalez-Izquierdo Ross J.Gray Martin King Robbie Wilson Rachel J.Dance Haydn Powell David A.Mac Lellan John McCreadie nicholas M.H.Butler Steve Hawkes James S.Green Chris D.Murphy Luca C.Stockhausen David C.carroll Nicola Booth Graeme G.Scott Marco Borghesi David Neely Paul McKenna SUPA Department of Physics University of Strathclyde Central Laser Facility STFC Rutherford Appleton Laboratory Department of Physics University of York Centro de Láseres Pulsados (CLPU) Centre for Plasma Physics Queens University Belfast

The collective response of electrons in an ultrathin foil target irradiated by an ultraintense(~6×10^(20)W cm^(-2)) laser pulse is investigated experimentally and via 3D particle-in-cell simulations. It is shown that if the target is sufficiently thin that the laser induces significant radiation pressure, but not thin enough to become relativistically transparent to the laser light, the resulting relativistic electron beam is elliptical, with the major axis of the ellipse directed along the laser polarization axis. When the target thickness is decreased such that it becomes relativistically transparent early in the interaction with the laser pulse, diffraction of the transmitted laser light occurs through a so called ‘relativistic plasma aperture', inducing structure in the spatial-intensity profile of the beam of energetic electrons. It is shown that the electron beam profile can be modified by variation of the target thickness and degree of ellipticity in the laser polarization.

关键词： laser–plasmas interaction ultraintense ultrashort pulse laser interaction with matters

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