Results 81 to 90 of about 48,855 (207)

Mixing ratios of volatile organic compounds (VOCs) in the atmosphere of Karachi, Pakistan [PDF]

, 2002
Mixing ratios of carbon monoxide (CO), methane (CH4), non-methane hydrocarbons, halocarbons and alkyl nitrates (a total of 72 species) were determined for 78 whole air samples collected during the winter of 1998-1999 in Karachi, Pakistan.
Barletta, B, Blake, DR, Khwaja, HA, Meinardi, S, Rowland, FS, Simpson, IJ   +5 more
core  

Evaluating TEMPO Formaldehyde Retrievals With Co‐Located Ground‐Based FTIR and Pandora Observations

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 9, 16 May 2026.
Abstract Formaldehyde (HCHO) is an important proxy for volatile organic compounds and photochemical activity, with significant implications for air quality and atmospheric chemistry. The recently launched geostationary satellite instrument Tropospheric Emissions: Monitoring of Pollution (TEMPO) provides the first‐ever hourly observations of HCHO and ...
Ivan Ortega, James W. Hannigan, David Edwards, Wolfgang Stremme, Michel Grutter, Andrea Cadena‐Caicedo, Kimberly Strong, Victoria Flood, Xiaoyi Zhao, Gonzalo Gonzalez Abad, Caroline R. Nowlan   +10 more
wiley   +1 more source

Selective Transfer Hydrogenation of Polyenes to Monoenes Catalysed by Shvo's Catalyst

Advanced Synthesis &Catalysis, Volume 368, Issue 9, 5 May 2026.
We report the reduction of polyenes to monoenes with near‐perfect selectivities at full conversion with isopropanol as hydrogen source. The reaction is catalysed by Shvo's catalyst and the selectivity towards conjugation, semihydrogenation or full hydrogenation can be adjusted via the reaction temperature.
Justus Diekamp, Annika Schmidt, Florian Lehmann, Lea Küsel, Carsten Strohmann, Dieter Vogt, Thomas Seidensticker   +6 more
wiley   +1 more source

Micro–Mesoporous Ferrierite: Strategies for Tuning the Accessibility of a Peculiar Zeolite

ChemCatChem, Volume 18, Issue 10, 27 May 2026.
The anisotropic structure of ferrierite (FER) zeolite makes challenging the increase of catalyst effectiveness by hierarchical porosity. The pore mouth location of the active sites for butene isomerization requires a fine balance between development of external surface and retention of shape selectivity.
Jonathan Fabian Sierra‐Cantor, Francesco Di Renzo, Nathalie Tanchoux, Corine Gérardin   +3 more
wiley   +1 more source

Effect of NOx level on secondary organic aerosol (SOA) formation from the photooxidation of terpenes [PDF]

, 2007
Secondary organic aerosol (SOA) formation from the photooxidation of one monoterpene (α-pinene) and two sesquiterpenes (longifolene and aromadendrene) is investigated in the Caltech environmental chambers.
Chan, A. W. H., Chhabra, P. S., Dalleska, N. F., Flagan, R. C., Kroll, J. H., Kwan, A. J., McCabe, D. C., Murphy, S. M., Ng, N. L., Seinfeld, J. H., Sorooshian, A., Surratt, J. D., Wennberg, P. O.   +12 more
core   +1 more source

Latex Serum‐Derived Supramolecular Networks Enable Toughening of Natural Rubber

Macromolecular Rapid Communications, Volume 47, Issue 10, 19 May 2026.
Latex‐serum addition enhances strain‐induced crystallization (SIC) toughening in natural rubber, increasing tearing strength and extending the SIC activation window. Supramolecular networks form via bifurcated hydrogen bonding between polyol components (e.g., quebrachitol) and end‐functionalized polyisoprene chains, serving as effective crystallization
Katsuhiko Tsunoda, Mayank Dixit, Yasuhiro Shoda, Yuji Kitamura, Takashi Taniguchi, Kenji Urayama   +5 more
wiley   +1 more source

Why do models overestimate surface ozone in the Southeast United States [PDF]

, 2016
Ozone pollution in the Southeast US involves complex chemistry driven by emissions of anthropogenic nitrogen oxide radicals (NOx  ≡  NO + NO2) and biogenic isoprene. Model estimates of surface ozone concentrations tend to be biased high in the region and
Cohen, Ronald C., Crounse, John D., Dibb, Jack E., Fisher, Jenny A., Hall, Samuel R., Jacob, Daniel J., Kim, Patrick S., Laughner, Joshua L., Marais, Eloise A., Miller, Christopher C., St. Clair, Jason M., Sulprizio, Melissa P., Thompson, Anne M., Travis, Katherine R., Ullmann, Kirk, Wennberg, Paul O., Wolfe, Glenn M., Yantosca, Robert M., Yu, Karen, Zhu, Lei   +19 more
core   +1 more source

Climate‐Driven Convergence of Chemical Ecotypes in Mediterranean Lamiaceae

Journal of Biogeography, Volume 53, Issue 5, May 2026.
ABSTRACT Aim To link the identity of the major monoterpenes in plants to their distribution across climatic gradients, and test whether patterns of chemical ecotypic differentiation are consistent across multiple Mediterranean Lamiaceae species. Location The Mediterranean region, with a focus on the Western Mediterranean region.
Andreas H. Faber, Thomas Bataillon, Bodil Kirstine Ehlers   +2 more
wiley   +1 more source

The use of disjunct eddy sampling methods for the determination of ecosystem level fluxes of trace gases [PDF]

, 2009
The concept of disjunct eddy sampling (DES) for use in measuring ecosystem-level micrometeorological fluxes is re-examined. The governing equations are discussed as well as other practical considerations and guidelines concerning this sampling method
Allwine, E., Cooper, W.A., Guenther, A.B., Karl, T., Lamb, B., Nemitz, E., Pressley, S.N., Shertz, S., Turnipseed, A.A.   +8 more
core  

Fascinating single‐cell red algae: models for evolution and adaptation

New Phytologist, Volume 250, Issue 3, Page 1424-1437, May 2026.
Summary The unicellular red algae, Cyanidiophyceae, that diverged early during Archaeplastida (algal and plant) evolution, occupy a variety of extreme habitats that are inhospitable for most other eukaryotes. With the use of modern genomics and genetics methods, Cyanidiophyceae show a remarkable taxonomic diversity, share haplodiplophasic life cycles ...
Frédéric Berger, Debashish Bhattacharya, Chung Hyun Cho, Seok‐Wan Choi, Julia Van Etten, Shunsuke Hirooka, Tzu‐Yen Huang, Kyle J. Lauersen, Yongsung Lee, Shao‐Lun Liu, Shin‐ya Miyagishima, Stephen D. Rader, Daniel Schubert, Hwan Su Yoon   +13 more
wiley   +1 more source