Results 111 to 120 of about 208,777 (323)

Polycyclic aromatic hydrocarbons and esophageal squamous cell carcinoma [PDF]

, 2012
Esophageal cancer (EC) is the 8th most common cancer and the 6th most frequent cause of cancer mortality worldwide. Esophageal squamous cell carcinoma (ESCC) is the most common type of EC.
Dawsey, S.M., Malekzadeh, R., Roshandel, G., Semnani, S.   +3 more
core  

Nanodust in the Interstellar Medium in Comparison to the Solar System

, 2012
Nanodust, which undergoes stochastic heating by single starlight photons in the interstellar medium, ranges from angstrom-sized large molecules containing tens to thousands of atoms (e.g.
Li, Aigen, Mann, Ingrid
core   +1 more source

Insights Into the Effect of Humic Acids Extraction From Coal on Hard Carbon Microstructure and Sodium Storage Properties

Carbon Energy, EarlyView.
This study employs a simple solid‐phase alkali‐oxygen oxidation (SAO) method to extract inherent components (humic acids) from coal. We successfully extracted yellow, brown, and black humic acids by adjusting the amount of alkali. Among them, brown humic acid extraction created abundant ultra‐micropores and closed pores, greatly enhancing sodium ...
Ruizhen Song, Yakun Tang, Xiaojun Lv, Jingjing Diao, Yue Zhang, Wenhai Zhang, Lang Liu, Limin Deng, Yuliang Cao   +8 more
wiley   +1 more source

Localized Deviations from the CO–Polycyclic Aromatic Hydrocarbon Relation in PHANGS-JWST Galaxies: Faint Polycyclic Aromatic Hydrocarbon Emission or Elevated CO Emissivity?

The Astrophysical Journal
Polycyclic aromatic hydrocarbon (PAH) emission is widely used to trace the distribution of molecular gas in the interstellar medium, exhibiting a tight correlation with CO(2–1) emission across nearby galaxies.
Jaeyeon Kim, Adam K. Leroy, Karin Sandstrom, Sharon E. Meidt, Yu-Hsuan Teng, Miguel Querejeta, Eva Schinnerer, Susan E. Clark, Ryan Chown, Simon C. O. Glover, Daniel A. Dale, Dalya Baron, Jessica Sutter, Ashley T. Barnes, Jakob den Brok, Rupali Chandar, I-Da Chiang, Oleg V. Egorov, Kathryn Grasha, Ralf S. Klessen, Kathryn Kreckel, Eric W. Koch, Hannah Koziol, Lukas Neumann, Hsi-An Pan, Sophia K. Stuber, Tony D. Weinbeck, Thomas G. Williams   +27 more
doaj   +1 more source

Benzo[cd]azulenyl: A Structural Isomer of Phenalenyl—Synthesis and Properties of Its Tri‐tert‐butyl‐substituted Derivative and Formation of a Thermal‐ and Photoresponsive σ‐Dimer

Chemistry – A European Journal, EarlyView.
Benzo[cd]azulenyl, a nonalternant isomer of phenalenyl, is identified as a new member of the nonalternant hydrocarbon radical family. The tri‐tert‐butyl substituted derivative forms a stable σ‐dimer in the solid state. Upon exposure to external stimuli such as light and heat, the σ‐bond of the dimer dissociates, producing the monomeric radical.
Kaho Takeuchi, Akihito Konishi, Makoto Yasuda   +2 more
wiley   +1 more source

Interplay of Orbital Overlap and Exciton Coupling in the Optical Properties of Adamantylethynyl‐Substituted Pyrene Molecular Crystals

Chemistry – A European Journal, EarlyView.
Sterically shielded adamantylethynyl‐substituted pyrenes form quasi‐one‐dimensional π‐stacks that enable direct quantification of solution‐to‐crystal spectral shifts. The optical response is dominated by band dispersion arising from frontier crystal orbitals, while excitonic contributions are secondary.
Benedikt Herbert, Kazutaka Shoyama
wiley   +1 more source

Relationship between the molecular composition, visible light absorption, and health-related properties of smoldering woodsmoke aerosols [PDF]

, 2019
Organic aerosols generated from the smoldering combustion of wood critically impact air quality and health for billions of people worldwide; yet, the links between the chemical components and the optical or biological effects of woodsmoke aerosol (WSA ...
Denison, MS, He, G, Kam Chan, L, Karim, N, Nguyen, KQ, Nguyen, TB, Rice, RH, Yang, Y   +7 more
core  

Strategies for producing biochars with minimum PAH contamination [PDF]

With the aim to develop initial recommendations for production of biochars with minimal contamination with polycyclic aromatic hydrocarbons (PAHs), we analysed a systematic set of 46 biochars produced under highly controlled pyrolysis conditions.
Buss, Wolfram, Graham, Margaret C., MacKinnon, Gillian, Mašek, Ondřej   +3 more
core   +1 more source

When Light Challenges Heat: Mechanistic Insights Into a Reaction Competing With Cadogan Cyclisation in Nitro‐Perylenediimides

Chemistry – A European Journal, EarlyView.
Visible‐light irradiation of nitro‐perylenediimide in the presence of triphenylphosphine reveals an unexpected pathway competing with the classical Cadogan cyclization. Mechanistic investigations uncover the rapid and selective formation of bay‐functionalized 1‐iminophosphorane‐12‐hydroxy perylenediimide derivatives.
Manuel Pedrón Laserna, Ilaria Ciofini, Piétrick Hudhomme   +2 more
wiley   +1 more source

Absorption and Fluorescence Spectroscopy of 1,2 : 3,4-Dibenzanthracene

International Journal of Photoenergy, 2012
Polycyclic aromatic hydrocarbon compound, 1,2 : 3,4-dibenzanthracene, is spectroscopically analyzed in ethanol. Ultraviolet absorption spectra were taken and fluorescence measurements were performed.
Fuat Bayrakceken, Korkut Yegin, Erdal Korkmaz, Yakup Bakis, Bayram Unal   +4 more
doaj   +1 more source