Now showing items 41-50 of 400
Ultraviolet-visible diode-array spectrophotometer as a detector for gas chromatography
(Elsevier, 1985-05-01)
An ultraviolet-visible diode-array spectrophotometer is used as a detector for gas chromatography. This detector can provide a full u.v.-visible spectrum of each compound as it elutes from the column, thus enhancing ...
Fabrication of conductometric gas-sensing films by selected area chemical-vapor deposition
(American Institute of Chemical EngineersWiley Periodiocals, Inc., 1997)
A new selected-area chemical-vapor deposition (CVD) process to fabricate thin sensing films on a micromachined silicon-based, conductometric gas-sensor structure is reported. The CVD method is self-lithographic and does ...
A convenient synthesis of substituted [gamma]-pyrones
(Elsevier, 1980)
An efficient and general synthetic method for various 2-mono- and 2,6-disubstituted [gamma]-pyrones has been developed. This utilizes the -acylation (70-85%) of [beta]-methoxy-[alpha],[beta]-enone lithium enolates by acid ...
Comparative proteomic study of two closely related ovarian endometrioid adenocarcinoma cell lines using cIEF fractionation and pathway analysis
(WILEY-VCH Verlag, 2009-04)
The proteomic profiles from two distinct ovarian endometrioid tumor-derived cell lines, (MDAH-2774 and TOV-112D) each with different morphological characteristics and genetic mutations, have been studied. Characterization ...
Exciton transport in naphthalene alloys: A transition from percolation to diffusion
(Elsevier, 1982-12-03)
Steady-state singlet excitation transport in ternary naphthalene crystals (C10H8/C10D8/[beta]-methylnaphthalene) fits diffusion models at 4.2 K, but not at 1.8 K, where it fits a percolation model.
Supercritical fluid jet expansions of polar aromatic carboxylic acids using simple derivatization with detection by resonant two-photon ionization
(Elsevier, 1988)
In this work simple derivatization is used as a means of enhancing the solubility of polar aromatic carboxylic acids in supercritical CO2 and N2O. The supercritical fluid is then expanded from 200 atm and 40[deg]C through ...
Heteroaromatic polyamides from cyanoimidazoles
(John Wiley & Sons, Inc., 1992-06)
The synthesis of a new class of heteroaromatic polyamides based on cyanoimidazoles are described. The monomer, 2-amino-4-cyanoimidazole-5-carboxylic acid ( 3 ) is prepared from a two-step hydrolysis of 2-amino-4,5-dicyanoimidazole ...
Synthesis of the Tetraketide Lactones from the Pikromycin Biosynthetic Pathway
(WILEY-VCH Verlag, 2007-07)
Synthesis of tetraketide lactones 2 and 3 , which are likely to be produced by a model pikromycin polyketide synthase (PKS), has been investigated. The tetraketide lactones with six-membered rings, 2a and 2b , were ...
Effects of cholate on Photosystem II: Selective extraction of a 22 kDa polypeptide and modification of QB-site activity
(Elsevier, 1993-10-04)
A quinone-mediated two-electron gate is shared by Photosystem II (PS II) and the photosystem of purple bacteria. In the bacterial reaction center, electron transfer from the reduced primary quinone acceptor, Q-A, to the ...
Electron diffraction study of the molecular structure of trifluoromethyl hypofluorite
(Elsevier, 1971-06)
The following structural parameters and estimated standard deviations were found for trifluoromethyl hypofluorite: rg(C-F) = 1.319 +/- 0.003 A, rg(C-O) = 1.395 +/- 0.006 A, rg(O-F) = 1.421 +/- 0.006 A, [angle-measured](F-C-F) ...