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Article ; Online: Characterization of semi-packed columns with different cross section in high-pressure gas chromatography.

Rachkidi, Michel / Michel, Ambroisine / Raffin, Guy / Barattin, Régis / Colinet, Eric / Randon, Jérôme

2024 Volume 1722, Page(s) 464869

Abstract: Hydrodynamics, efficiency, and loading capacity of two semi-packed columns with different cross sections (NANO 315 µm x 18 µm; CAP 1000 µm x 28 µm) and similar pillar diameter and pillar-pillar distance (respectively 5 µm and 2.5 µm) have been compared ... ...

Abstract	Hydrodynamics, efficiency, and loading capacity of two semi-packed columns with different cross sections (NANO 315 µm x 18 µm; CAP 1000 µm x 28 µm) and similar pillar diameter and pillar-pillar distance (respectively 5 µm and 2.5 µm) have been compared in high-pressure gas chromatography. A flow prediction tool has been first designed to determine pressure variations and hold-up time across the chromatographic system taking into account the rectangular geometry of the ducts into the semi-packed columns. Intrinsic values of Height Equivalent to Theoretical Plate were determined for NANO and CAP columns using helium as carrier gas and similar values have been obtained (30 µm) for the two columns. Loading capacity of semi-packed columns were determined for decane at 70 °C using helium, and the highest value was obtained from CAP column (larger cross section and stationary phase content). Finally, significant HETP improvement (down to 15 µm) and peak shape were observed when carbon dioxide was used as carrier gas, suggesting mobile phase adsorption on stationary phase in high pressure conditions.
MeSH term(s)	Chromatography, Gas/methods ; Chromatography, Gas/instrumentation ; Helium/chemistry ; Pressure ; Hydrodynamics ; Carbon Dioxide/chemistry ; Adsorption
Chemical Substances	Helium (206GF3GB41) ; Carbon Dioxide (142M471B3J)
Language	English
Publishing date	2024-04-03
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	1171488-8
ISSN	1873-3778 ; 0021-9673
ISSN (online)	1873-3778
ISSN	0021-9673
DOI	10.1016/j.chroma.2024.464869
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Article ; Online: Review on Micro-Gas Analyzer Systems: Feasibility, Separations and Applications.

Lussac, Elodie / Barattin, Regis / Cardinael, Pascal / Agasse, Valerie

Critical reviews in analytical chemistry

2016 Volume 46, Issue 6, Page(s) 455–468

Abstract: Over 30 years, portable systems for fast and reliable gas analysis are at the core of both academic and industrial research. Miniaturized systems can be helpful in several domains. The way to make it possible is to miniaturize the whole gas chromatograph. ...

Abstract	Over 30 years, portable systems for fast and reliable gas analysis are at the core of both academic and industrial research. Miniaturized systems can be helpful in several domains. The way to make it possible is to miniaturize the whole gas chromatograph. Micro-system conception by etching silicon channel is well known. The main objective is to obtain similar or superior efficiencies to those obtained from laboratory chromatographs. However, stationary phase coatings on silicon surface and micro-detector conception with a low limit of detection remain a challenge. Developments are still in progress to offer a large range of stationary phases and detectors to meet the needs of analytical scientists. This review covers the recent development of micro-gas analyzers. It focuses on injectors, stationary phases, column designs and detectors reported in the literature during the last three decades. A list of commercially available micro-systems and their performances will also be presented.
MeSH term(s)	Chromatography, Gas/instrumentation ; Chromatography, Gas/methods ; Silicon/chemistry ; Volatile Organic Compounds/analysis
Chemical Substances	Volatile Organic Compounds ; Silicon (Z4152N8IUI)
Language	English
Publishing date	2016-11
Publishing country	United States
Document type	Journal Article ; Review
ZDB-ID	2030019-0
ISSN	1547-6510 ; 1040-8347
ISSN (online)	1547-6510
ISSN	1040-8347
DOI	10.1080/10408347.2016.1150153
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Article ; Online: Chemical modifications of atomic force microscopy tips.

Barattin, Régis / Voyer, Normand

Methods in molecular biology (Clifton, N.J.)

2011 Volume 736, Page(s) 457–483

Abstract: Atomic force microscopy (AFM) works by scanning a very tiny tip over a surface with great precision. The microscope tips can be chemically functionalized to improve the images obtained. Well-defined chemical functionalization of AFM tips is especially ... ...

Abstract	Atomic force microscopy (AFM) works by scanning a very tiny tip over a surface with great precision. The microscope tips can be chemically functionalized to improve the images obtained. Well-defined chemical functionalization of AFM tips is especially important for experiments, such as chemical force microscopy and single molecule recognition force microscopy, to examine specific interactions at the single molecular level. In this chapter, we present an overview of chemical modifications of tips that have been reported to date with regards to the proper fixation of probe molecules, focusing particularly on chemical procedures developed to anchor biological molecules on AFM tips.
MeSH term(s)	Microscopy, Atomic Force/instrumentation ; Microscopy, Atomic Force/methods ; Molecular Imaging/instrumentation ; Molecular Imaging/methods ; Silicon/chemistry ; Silicon Compounds/chemistry ; Surface Properties
Chemical Substances	Silicon Compounds ; silicon nitride (QHB8T06IDK) ; Silicon (Z4152N8IUI)
Language	English
Publishing date	2011-05-19
Publishing country	United States
Document type	Journal Article ; Review
ISSN	1940-6029
ISSN (online)	1940-6029
DOI	10.1007/978-1-61779-105-5_28
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Chemical modifications of AFM tips for the study of molecular recognition events.

Barattin, Régis / Voyer, Normand

Chemical communications (Cambridge, England)

2008 , Issue 13, Page(s) 1513–1532

Abstract: The use of AFM to study molecular recognition events at an incredible level of sensitivity is currently a very active field of research. In order to get information at the single molecule level, it is mandatory to modify in a precise manner the AFM tip ... ...

Abstract	The use of AFM to study molecular recognition events at an incredible level of sensitivity is currently a very active field of research. In order to get information at the single molecule level, it is mandatory to modify in a precise manner the AFM tip to anchor either ligand or receptor molecules. In the following lines, we review the achievements in tip modifications and illustrate the scope and limitations of the different strategies that have been reported.
MeSH term(s)	Antibodies/chemistry ; Antigen-Antibody Reactions ; Antigens/chemistry ; Gold/chemistry ; Microscopy, Atomic Force/instrumentation ; Microscopy, Atomic Force/methods ; Nanotubes, Carbon/chemistry ; Peptides/chemistry ; Polyethylene Glycols/chemistry ; Sensitivity and Specificity ; Silicon/chemistry ; Surface Properties
Chemical Substances	Antibodies ; Antigens ; Nanotubes, Carbon ; Peptides ; Polyethylene Glycols (30IQX730WE) ; Gold (7440-57-5) ; Silicon (Z4152N8IUI)
Language	English
Publishing date	2008-04-07
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Review
ZDB-ID	1472881-3
ISSN	1364-548X ; 1359-7345 ; 0009-241X
ISSN (online)	1364-548X
ISSN	1359-7345 ; 0009-241X
DOI	10.1039/b614328h
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Article: Chemical modifications of AFM tips for the study of molecular recognition events

Barattin, Régis / Voyer, Normand

Chemical communications. 2008 Mar. 19, , no. 13

2008

Abstract	The use of AFM to study molecular recognition events at an incredible level of sensitivity is currently a very active field of research. In order to get information at the single molecule level, it is mandatory to modify in a precise manner the AFM tip to anchor either ligand or receptor molecules. In the following lines, we review the achievements in tip modifications and illustrate the scope and limitations of the different strategies that have been reported.
Keywords	chemical reactions ; ligands
Language	English
Dates of publication	2008-0319
Size	p. 1513-1532.
Publishing place	The Royal Society of Chemistry
Document type	Article
ZDB-ID	1472881-3
ISSN	1364-548X ; 1359-7345 ; 0009-241X
ISSN (online)	1364-548X
ISSN	1359-7345 ; 0009-241X
DOI	10.1039/b614328h
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Three-dimensional hydrogen bonding between Landers and planar molecules facilitated by electrostatic interactions with Ni adatoms.

Yu, Miao / Benjalal, Youness / Chen, Chong / Kalashnyk, Nataliya / Xu, Wei / Barattin, Régis / Nagarajan, Samuthira / Lægsgaard, Erik / Stensgaard, Ivan / Hliwa, Mohamed / Gourdon, André / Besenbacher, Flemming / Bouju, Xavier / Linderoth, Trolle R

Chemical communications (Cambridge, England)

2018 Volume 54, Issue 64, Page(s) 8845–8848

Abstract: Using a combination of UHV-STM and molecular mechanics calculations, we investigate the surface self-assembly of a complex multi-component metal-molecule system with synergistic non-covalent interactions. Hydrogen bonding between three-dimensional Lander- ...

Abstract	Using a combination of UHV-STM and molecular mechanics calculations, we investigate the surface self-assembly of a complex multi-component metal-molecule system with synergistic non-covalent interactions. Hydrogen bonding between three-dimensional Lander-DAT molecules and planar PTCDI molecules, adsorbed closer to the surface, is found to be facilitated by electrostatic interactions between co-adsorbed Ni adatoms and the flexible molecular DAT groups.
Language	English
Publishing date	2018-08-07
Publishing country	England
Document type	Journal Article
ZDB-ID	1472881-3
ISSN	1364-548X ; 1359-7345 ; 0009-241X
ISSN (online)	1364-548X
ISSN	1359-7345 ; 0009-241X
DOI	10.1039/c8cc04247k
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Article ; Online: Three-dimensional hydrogen bonding between Landers and planar molecules facilitated by electrostatic interactions with Ni adatoms

Chemical communications. 2018 Aug. 7, v. 54, no. 64 p.8845-8848

2018

Abstract	Using a combination of UHV-STM and molecular mechanics calculations, we investigate the surface self-assembly of a complex multi-component metal-molecule system with synergistic non-covalent interactions. Hydrogen bonding between three-dimensional Lander-DAT molecules and planar PTCDI molecules, adsorbed closer to the surface, is found to be facilitated by electrostatic interactions between co-adsorbed Ni adatoms and the flexible molecular DAT groups.
Keywords	chemical reactions ; electrostatic interactions ; hydrogen bonding ; mechanics ; nickel
Language	English
Dates of publication	2018-0807
Size	p. 8845-8848.
Publishing place	The Royal Society of Chemistry
Document type	Article ; Online
ZDB-ID	1472881-3
ISSN	1364-548X ; 1359-7345 ; 0009-241X
ISSN (online)	1364-548X
ISSN	1359-7345 ; 0009-241X
DOI	10.1039/c8cc04247k
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Iodination of verapamil for a stronger induction of death, through GSH efflux, of cancer cells overexpressing MRP1.

Barattin, Régis / Perrotton, Thomas / Trompier, Doriane / Lorendeau, Doriane / Di Pietro, Attilio / d'Hardemare, Amaury du Moulinet / Baubichon-Cortay, Hélène

Bioorganic & medicinal chemistry

2010 Volume 18, Issue 17, Page(s) 6265–6274

Abstract: The multidrug resistance protein 1 (MRP1), involved in multidrug resistance (MDR) of cancer cells, was found to be modulated by verapamil, through stimulation of GSH transport, leading to apoptosis of MRP1-overexpressing cells. In this study, various ... ...

Abstract	The multidrug resistance protein 1 (MRP1), involved in multidrug resistance (MDR) of cancer cells, was found to be modulated by verapamil, through stimulation of GSH transport, leading to apoptosis of MRP1-overexpressing cells. In this study, various iodinated derivatives of verapamil were synthesized, including iodination on the B ring, known to be involved in verapamil cardiotoxicity, and assayed for the stimulation of GSH efflux by MRP1. The iodination, for nearly all compounds, led to a higher stimulation of GSH efflux. However, determination of concomitant cytotoxicity is also important for selecting the best compound, which was found to be 10-fold more potent than verapamil. This will then allow us to design original anti-cancer compounds which could specifically kill the resistant cancer cells.
MeSH term(s)	ATP-Binding Cassette, Sub-Family B, Member 1/biosynthesis ; Cell Death/drug effects ; Cell Line, Tumor ; Glutathione/metabolism ; Halogenation ; Humans ; Hydrocarbons, Iodinated/chemical synthesis ; Hydrocarbons, Iodinated/chemistry ; Hydrocarbons, Iodinated/pharmacology ; Structure-Activity Relationship ; Transfection ; Tumor Cells, Cultured ; Verapamil/analogs & derivatives ; Verapamil/chemistry ; Verapamil/pharmacology
Chemical Substances	ATP-Binding Cassette, Sub-Family B, Member 1 ; Hydrocarbons, Iodinated ; Verapamil (CJ0O37KU29) ; Glutathione (GAN16C9B8O)
Language	English
Publishing date	2010-09-01
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1161284-8
ISSN	1464-3391 ; 0968-0896
ISSN (online)	1464-3391
ISSN	0968-0896
DOI	10.1016/j.bmc.2010.07.031
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Article ; Online: Self-assembly of hydrogen-bonded chains of molecular landers.

Yu, Miao / Kalashnyk, Nataliya / Barattin, Régis / Benjalal, Youness / Hliwa, Mohamed / Bouju, Xavier / Gourdon, André / Joachim, Christian / Laegsgaard, Erik / Besenbacher, Flemming / Linderoth, Trolle R

Chemical communications (Cambridge, England)

2010 Volume 46, Issue 30, Page(s) 5545–5547

Abstract: One-dimensional chains of a specially designed lander molecule with di-carboxyl imide functional moieties, enabling complementary intermolecular hydrogen bonding, have been self-assembled under ultra high vacuum conditions on a Au(111) surface and ... ...

Abstract	One-dimensional chains of a specially designed lander molecule with di-carboxyl imide functional moieties, enabling complementary intermolecular hydrogen bonding, have been self-assembled under ultra high vacuum conditions on a Au(111) surface and characterized by scanning tunneling microscopy.
Language	English
Publishing date	2010-08-14
Publishing country	England
Document type	Journal Article
ZDB-ID	1472881-3
ISSN	1364-548X ; 1359-7345 ; 0009-241X
ISSN (online)	1364-548X
ISSN	1359-7345 ; 0009-241X
DOI	10.1039/c0cc01130d
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Article ; Online: Supramolecular architectures on surfaces formed through hydrogen bonding optimized in three dimensions.

Yu, Miao / Kalashnyk, Nataliya / Xu, Wei / Barattin, Régis / Benjalal, Youness / Laegsgaard, Erik / Stensgaard, Ivan / Hliwa, Mohamed / Bouju, Xavier / Gourdon, André / Joachim, Christian / Besenbacher, Flemming / Linderoth, Trolle R

ACS nano

2010 Volume 4, Issue 7, Page(s) 4097–4109

Abstract: Supramolecular self-assembly on surfaces, guided by hydrogen bonding interactions, has been widely studied, most often involving planar compounds confined directly onto surfaces in a planar two-dimensional (2-D) geometry and equipped with structurally ... ...

Abstract	Supramolecular self-assembly on surfaces, guided by hydrogen bonding interactions, has been widely studied, most often involving planar compounds confined directly onto surfaces in a planar two-dimensional (2-D) geometry and equipped with structurally rigid chemical functionalities to direct the self-assembly. In contrast, so-called molecular Landers are a class of compounds that exhibit a pronounced three-dimensional (3-D) structure once adsorbed on surfaces, arising from a molecular backboard equipped with bulky groups which act as spacer legs. Here we demonstrate the first examples of extended, hydrogen-bonded surface architectures formed from molecular Landers. Using high-resolution scanning tunnelling microscopy (STM) under well controlled ultrahigh vacuum conditions we characterize both one-dimensional (1-D) chains as well as five distinct long-range ordered 2-D supramolecular networks formed on a Au(111) surface from a specially designed Lander molecule equipped with dual diamino-triazine (DAT) functional moieties, enabling complementary NH...N hydrogen bonding. Most interestingly, comparison of experimental results to STM image calculations and molecular mechanics structural modeling demonstrates that the observed molecular Lander-DAT structures can be rationalized through characteristic intermolecular hydrogen bonding coupling motifs which would not have been possible in purely planar 2-D surface assembly because they involve pronounced 3-D optimization of the bonding configurations. The described 1-D and 2-D patterns of Lander-DAT molecules may potentially be used as extended molecular molds for the nucleation and growth of complex metallic nanostructures.
Language	English
Publishing date	2010-07-27
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	1936-086X
ISSN (online)	1936-086X
DOI	10.1021/nn100450q
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