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368059

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Jerry Isaacson et al.
Angewandte Chemie (International ed. in English), 48(10), 1845-1848 (2009-01-29)
(-)-Dysibetaine has been synthesized in 11 steps from readily available L-malic acid (see scheme). The key step is a unique Ugi 4-center-3-component cyclization reaction, where an ester group acts as the carboxylic acid component. The use of 1,1,1,3,3,3-hexamethyldisilazane as an...
Natalie M Clark et al.
Chemical communications (Cambridge, England), (39)(39), 5835-5837 (2009-09-30)
'Conventional' (-)-sparteine adducts of lithium and sodium 1,1,1,3,3,3-hexamethyldisilazide (HMDS) were prepared and characterised, along with an unexpected and 'unconventional' hydroxyl-incorporated sodium sodiate, [(-)-sparteine x Na(mu-HMDS)Na x (-)-sparteine](+)[Na(4)(mu-HMDS)(4)(OH)](-)--the complex anion of which is the first inverse crown ether anion.
D B Mahadik et al.
Journal of colloid and interface science, 356(1), 298-302 (2011-02-01)
The surface free energy of a solid determines its surface and interfacial behavior in processes like wetting and adhesion which is crucial for silica aerogels in case of organic liquid absorption and transportation of chemicals at nano-scale for biotechnological applications....
Marko Marinkovic et al.
Advanced materials (Deerfield Beach, Fla.), 24(29), 4005-4009 (2012-06-26)
A model is presented that describes the gate-voltage-dependent contact resistance and channel-length-dependent charge carrier mobility of small-molecule-based organic thin-film transistors in top and bottom drain/source contact configuration.
Takashi Nagase et al.
Journal of computer assisted tomography, 32(5), 816-821 (2008-10-03)
Microscopic computed tomography (microCT) has been recently applied to morphological evaluation of mouse embryos with or without congenital malformations, and 3-dimensional (3D) digital images of the whole embryo can be obtained. In the present study, the authors report a modified...
Xinfeng Zhang et al.
Langmuir : the ACS journal of surfaces and colloids, 26(22), 16828-16832 (2010-10-06)
Two-dimensional silica nanoparticle assemblies were obtained by deposition of bubble made from a surfactant solution containing nanoparticles onto hydrophobic silicon substrate. The morphologies of the nanoparticle assemblies can be finely controlled by several experimental parameters, including surfactant concentration, nanoparticle concentration...
Adrienne C Greene et al.
Biomaterials, 32(34), 8860-8869 (2011-09-03)
Chemical and topographical cues can be used to guide dissociated neurons into user-defined network geometries on artificial substrates, yet control of neuron polarity (differentiation into axons and dendrites) remains an elusive goal. We developed a dual guidance cue strategy for...
Hexamethyldisilazane-mediated controlled polymerization of alpha-amino acid N-carboxyanhydrides.
Hua Lu et al.
Journal of the American Chemical Society, 129(46), 14114-14115 (2007-10-30)
Markus Jonek et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 21(44), 15759-15768 (2015-09-24)
4-Phenylsemicarbazide and 1,5-diphenylcarbazide are suitable starting materials for the syntheses of N-heterocyclic carbene (NHC) compounds with new backbone structures. In the first case, cyclisation and subsequent methylation leads to a cationic precursor whose deprotonation affords the triazolon-ylidene 2, which was...
Daniele Fabbri et al.
Environmental science & technology, 42(8), 2957-2963 (2008-05-24)
Using the pyrolysis-gas chromatography-mass spectrometry and off-line pyrolysis/silylation methods for lignites from three Miocene brown coal basins of Poland resulted in the characterization of many organic compounds, including dominant cellulose degradation products such as levoglucosan, 1,6-anhydro-beta-D-glucofuranose, and 1,4:3,6-dianhydroglucopyranose. Levoglucosan is...
A Sebok et al.
Journal of chromatography. A, 1211(1-2), 104-112 (2008-10-14)
This paper presents a derivatization, mass fragmentation study relating to the most common six cholic acids, such as cholic, lithocholic, chenodeoxycholic, ursodeoxycholic, 3-hydroxy,7-ketocholanic and dehydrocholic acids, identified and quantified as pollutants in the aquatic environment at the first time. Derivatizations...
Tejia Zhang et al.
Journal of lipid research, 56(8), 1501-1510 (2015-06-11)
Apoptosis is an intricately regulated cellular process that proceeds through different cell type- and signal-dependent pathways. In the mitochondrial apoptotic program, mitochondrial outer membrane permeabilization by BCL-2 proteins leads to the release of apoptogenic factors, caspase activation, and cell death....
Mario Janjetovic et al.
Chemical communications (Cambridge, England), 49(18), 1826-1828 (2013-01-30)
Sm(HMDS)(2) in n-hexane mediates fast cleavage of primary, secondary and tertiary alkyl fluorides in good to excellent yields. In n-hexane Sm(HMDS)(2) exhibits uniquely enhanced reductive ability towards the C-F bond compared to when using THF as solvent.
Tong Zhang et al.
Electrophoresis, 29(4), 944-951 (2008-01-24)
This simultaneous separation of basic, acidic and neutral analytes by pressure-assisted CEC (pCEC) using a hybrid (tetramethoxysilane and methyltrimethoxysilane) silica-based monolith, chemically modified with octadecyldimethylchlorosilane followed by endcapping with hexamethyldisilazane is described. The endcapping resulted in near Gaussian peaks for...
Tatsuya Nitabaru et al.
Journal of the American Chemical Society, 131(38), 13860-13869 (2009-09-10)
Full details of an anti-selective catalytic asymmetric nitroaldol reaction promoted by a heterobimetallic catalyst comprised of Nd(5)O(O(i)Pr)(13), an amide-based ligand, and NaHMDS (sodium hexamethyldisilazide) are described. A systematic synthesis and evaluation of amide-based ligands led to the identification of optimum...
Hung-Che Chou et al.
Colloids and surfaces. B, Biointerfaces, 73(2), 244-249 (2009-06-24)
This paper utilizes a silver electrode quartz crystal microbalance (QCM) mass sensor to detect the physiology of cells. This study also investigates the plasma surface modification of silver electrode QCMs through deposition of hexamethyldisilazane (HMDSZ) films as a protection film....
Xiaoguang Li et al.
Chemical communications (Cambridge, England), 47(38), 10761-10763 (2011-08-30)
A silica microsphere suspension and a silica sol are employed in a two-step dipping process for the preparation of a superhydrophobic surface. It's not only a facile way to achieve the lotus effect, but can also create a multi-functional surface...
Zhengtao Deng et al.
Nanoscale, 3(10), 4346-4351 (2011-09-15)
Here we report the colloidal synthesis of size-tunable SnS nanocrystals that have an unusual meta-stable cubic zinc-blende phase instead of the more stable layered orthorhombic phase. The single-crystalline zinc-blende SnS nanocrystals with sizes of 8 nm, 60 nm, and 700...
Nan Li et al.
Lab on a chip, 8(12), 2105-2112 (2008-11-22)
High-density live cell array serves as a valuable tool for the development of high-throughput immunophenotyping systems and cell-based biosensors. In this paper, we have, for the first time, demonstrated a simple fabrication process to form the hexamethyldisilazane (HMDS) and poly(ethylene...
H B Lazrek et al.
Nucleosides, nucleotides & nucleic acids, 26(8-9), 1095-1098 (2007-12-07)
Several alpha/beta-D-ribonucleosides were synthesized in good yields under mild conditions by N-glycosylations of acetyl 2,3,5-tri-O-benzoyl-beta-D-ribofuranose with silylated nucleobases in acetonitrile using NP doped with iodine as catalyst.
Juliana Tsz Yan Lee et al.
Scanning, 34(1), 12-25 (2012-04-26)
Common dehydration methods of cells on biomaterials for scanning electron microscopy (SEM) include air drying, hexamethyldisilazane (HMDS) or tetramethysilane (TMS) treatment and critical point drying (CPD). On the other side, freeze-drying has been widely employed in dehydrating biological samples and...
Werner Mormann et al.
Macromolecular bioscience, 9(4), 369-375 (2008-11-26)
Trimethylsilylation of cellulose in different 1,3-dialkylimidazolium ionic liquids (IL) with hexamethyldisilazane (HMDS) as a silylating agent was investigated. Trimethylsilyl (TMSi) cellulose with a degree of substitution (DS) greater than 1 is insoluble in the IL. The maximum DS obtained depends...
Haoyu Tang et al.
Biomacromolecules, 11(6), 1585-1592 (2010-05-15)
A series of poly(gamma-chloropropyl-L-glutamate) (PCPLG) with controlled polymer molecular weight (MW = 5-28 kg x mol(-1)) and molecular weight distribution (PDI = 1.16-1.26) have been prepared from hexamethyldisilazane (HMDS)-mediated ring-opening polymerization (ROP) of gamma-chloropropyl-L-glutamic acid based N-carboxylanhydride (CP-NCA). CD, FTIR...
Nondestructively creating nanojunctions by combined-dynamic-mode dip-pen nanolithography.
Guanxia Shen et al.
Chemphyschem : a European journal of chemical physics and physical chemistry, 10(13), 2226-2229 (2009-07-16)
Nur Hazlin Hazrin-Chong et al.
Journal of microbiological methods, 90(2), 96-99 (2012-05-09)
The use of hexamethyldisilazane (HMDS) as a drying agent was investigated in the specimen preparation for scanning electron microscopy (SEM) imaging of bacterial surface colonization on sub-bituminous coal. The ability of microbes to biofragment, ferment and generate methane from coal...
Elsa Vennat et al.
Dental materials : official publication of the Academy of Dental Materials, 25(6), 729-735 (2009-01-29)
The objectives of this study were to assess demineralized dentin porosity and quantify the different porous features distribution within the material using mercury intrusion porosimetry (MIP) technique. We compared hexamethyldisilazane (HMDS) drying and lyophilization (LYO) (freeze-drying) in sample preparation. Fifty-six...
S V Buravkov et al.
Bulletin of experimental biology and medicine, 151(3), 378-382 (2012-03-28)
We compared conventional method for specimen (cell cultures, tissue specimens) preparation for scanning electron microscopy and a method without sputtering and critical-point drying. OTO-method (osmium-thiocarbohydrazide-osmium) with sample impregnation with hexamethyldisilazane followed by air drying was used as an alternative method....