Results 251 to 260 of about 19,542 (306)

Measurement of emissions from air pollution sources. 5. C1-C32 organic compounds from gasoline-powered motor vehicles.

Environmental Science and Technology, 2002
Gas- and particle-phase organic compounds present in the tailpipe emissions from an in-use fleet of gasoline-powered automobiles and light-duty trucks were quantified using a two-stage dilution source sampling system. The vehicles were driven through the
J. Schauer, M. Kleeman, G. Cass, B. Simoneit   +3 more
semanticscholar   +1 more source

ChemInform Abstract: Calyculins: Asymmetric Synthesis of the C26‐C32 Fragment.

ChemInform, 1994
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Ari M. P. Koskinen, Petri M. Pihko
openaire   +3 more sources

Hydrogen adsorption,structural, electronic, and spectroscopic properties of C32, B16N16, and B8C24 by DFT calculations

, 2017
We used DFT calculations at B3LYP/6-31G(d) level of theory to investigate the structural, electronic and spectral properties of C32, B16N16, and B8C24 nanocages. The C32 found as the most stable one and the bond lengths was approximately constant for the
Khadijeh Kalateh, G. Cordshooli, Sara Kheirollahpoor   +2 more
semanticscholar   +1 more source

Effects of electrophotodynamic therapy in vitro on human melanoma cells – melanotic (MeWo) and amelanotic (C32)

Melanoma research, 2015
Photodynamic therapy has been considered ineffective for melanomas because of the competition between the absorbance of melanin from the melanoma and the absorbance of photosensitizers at the photosensitizer excitation light wavelength.
A. Choromańska, J. Kulbacka, Nina Rembiałkowska, Justyna Piłat, M. Drąg-Zalesińska, T. Wysocka, A. Garbiec, M. Kotulska, J. Saczko   +8 more
semanticscholar   +1 more source

Wallenone, a C32 triterpenoid from the leaves of Gyrinops walla

Phytochemistry, 1986
Abstract Wallenone, a new C 32 tirucallane-type triterpene isolated from the leaves of Gyrinops walla , has been shown to be 24-methylene-25-methyltirucall-7-en-3-one through X-ray crystallographic analysis and 2D-NMR spectroscopy.
Philip J. Cox, Yeh Schun, Geoffrey A. Cordell, R. Alan Howie   +3 more
openaire   +2 more sources

Using Synthetic Controls: Feasibility, Data Requirements, and Methodological Aspects

Journal of Economic Literature, 2021
Probably because of their interpretability and transparent nature, synthetic controls have become widely applied in empirical research in economics and the social sciences.
Alberto Abadie
semanticscholar   +1 more source

Theoretical study of metallofullerenes M@C32

Journal of Molecular Structure: THEOCHEM, 1998
Abstract 14 systems of metal atoms, embedded inside the C 32 cage, have been calculated and analyzed using the ab initio quantum chemistry Gamess program. We study their electronic structure, compare their stability. The metal atom with even electrons interjected inside the C 32 cage is more stable than the metal atom with odd electrons.
Ying-Nan Chiu, Jimei Xiao, Shan-Tao Lai, Menghai Lin, Menghai Lin, Manzheng Fu   +5 more
openaire   +3 more sources

A Stereoselective Synthesis of the C20-C32 Fragment of the Phorboxazoles

Synlett, 2007
The C20-C32 fragment of the phorboxazoles was realized in a stereoconvergent manner utilizing a desymmetrization approach. This successful strategy involves epimerization and modified Julia olefination as key steps.
Jhillu S. Yadav, M. Satyanarayana, G. Srinivasulu, A. C. Kunwar   +3 more
openaire   +2 more sources

An evaluation of contrasting C32 alkane dosing and faecal sampling regimes to estimate herbage dry matter intake by beef cattle

Journal of Agricultural Sciences, 2014
SUMMARY Two experiments were carried out to evaluate different dosing and sampling regimes for estimating the dry matter intake (DMI) of vegetation by grazing beef cattle.
A. S. Richmond, A. Wylie, A. Laidlaw, F. Lively   +3 more
semanticscholar   +1 more source

Geometric and electronic structures of polymerized C32 fullerenes: Electronic structure tuning by fullerene and carbon nanotube filling

, 2015
We report first-principles total-energy calculations providing the geometric and electronic structures of polymerized small fullerene C32, and C36- and carbon nanotube (CNT)-filled C32 polymers.
M. Maruyama, S. Okada
semanticscholar   +1 more source