Results 71 to 80 of about 489,454 (164)

Floral Scent Composition of Analyzed by HS-SPME

Natural Product Communications, 2012
The headspace volatile compounds of the flowers of Plumeria tuberculata Lodd. were analyzed by solid phase microextraction coupled with capillary gas chromatography/mass spectrometry.
Disnelys Báez, Jorge A. Pino, Diego Morales   +2 more
doaj   +1 more source

Microbiome‐mediated chemical communication in insects: Implications for pest management

Pest Management Science, Volume 82, Issue 9, Page 8132-8151, September 2026.
Microbiome–semiochemical interactions involve the following processes: direct microbial synthesis, host gene regulation, precursor biotransformation, microbiome modulation and indirect ecological signaling. Abstract Insects rely on semiochemicals to regulate aggregation, mating, foraging, and host selection. This review synthesizes evidence that insect‐
Ioannis Eleftherianos, Wei Zhang, Amr Mohamed, Rasha K. Al‐Akeel, Abeer M. Alkhaibari, Nemat Keyhani, Guy Smagghe   +6 more
wiley   +1 more source

Variously Substituted Cyclopenta[2,1‐b:3,4‐b’]difluorenyl Radicals: A Validation of Clar's Rule

European Journal of Organic Chemistry, Volume 29, Issue 30, 12 August 2026.
Clar's empiric rule implies that the most contributing resonance formula is that with the maximum number of fully intact benzene rings. This is now further supported experimentally by the synthesis of two further, differently substituted cyclopenta[2,1‐b:3,4‐b’]difluorenyl radicals.
Ali S. Acan, Johannes Werner, Rabea J. Schneider, Joachim Podlech   +3 more
wiley   +1 more source

Interaction Among Microbiota, Chemical Composition, and Quality Variations in Coffea arabica Across Altitudinal Gradients During Wet Processing

Food Science &Nutrition, Volume 14, Issue 8, August 2026.
Fermentation significantly altered the dominant bacterial genera from Sphingomonas and Pleomorphomonas (before fermentation) to Weissella and Lactobacillus (after fermentation), while Cladosporium and Fusarium remained the dominant fungal genera. Notably, non‐volatile compounds in de‐pulping coffee beans and volatile compounds of roasted coffee beans ...
Xiaojing Shen, Yamei Wu, Qi Wang, Wenhua Chen, Bintao Peng, Surui Lu, Ying Yang, Kunyi Liu, Jilai Zhang   +8 more
wiley   +1 more source

Orchid genome evolution and trait innovation

Journal of Integrative Plant Biology, Volume 68, Issue 8, Page 2577-2607, August 2026.
Orchids became one of the world's most diverse plant groups through genome‐driven innovations, unique relationships with fungi and pollinators, and remarkable adaptability. This review explains the origins of orchids and the evolution of their distinctive life forms, flowers, and ecological strategies and highlights promising directions for future ...
Meng‐Yao Zeng, Cheng‐Yuan Zhou, Linying Wang, Jie Gao, Weilun Yin, Dong‐Hui Peng, Siren Lan, Feng‐Xi Yang, Zhong‐Jian Liu   +8 more
wiley   +1 more source

Why is phenanthrene more stable than anthracene?

Macedonian Journal of Chemistry and Chemical Engineering, 2007
By means of a recently developed molecular-orbital-based method it is possible to estimate the energy effects of individual cycles, as well as pairs, triplets, etc. of cycles in polycyclic conjugated molecules.
Ivan Gutman, Sonja Stanković
doaj   +1 more source

A Chiral Saddle‐Shaped Nanographene With Two Heptagon‐Embedded [4]Helicenes

Angewandte Chemie International Edition, Volume 65, Issue 31, 27 July 2026.
We present a novel synthetic strategy toward a chiral saddle‐shaped nanographene (cSNG) via a two‐step oxidation of a prochiral anthracene precursor. The Scholl‐type oxidation first yields a key intermediate with sp3‐defect heptagons, and subsequent oxidative dehydrogenation affords fully conjugated cSNG.
Felix Trautner, Boris Borrisov, Philipp Royla, Hongqing Zhao, Hartmut Komber, Li Wan, Evgenia Dmitrieva, Ji Ma, Jan J. Weigand, Qun Yang, Xinliang Feng, Wenhui Niu   +11 more
wiley   +1 more source

Molecular descriptors of benzenoid systems

Química Nova
Molecular descriptors are being widely used in QSAR/QSPR studies in chemistry and drug designing as well as modeling of compounds. Different topological descriptors have been formulated to investigate the physio chemical properties and chemical ...
Nazeran Idrees, Muhammad Nawaz Naeem, Fida Hussain, Afshan Sadiq, Muhammad Kamran Siddiqui   +4 more
doaj   +1 more source

Wiener Numbers of Pericondensed Benzenoid Hydrocarbons

Croatica Chemica Acta, 1997
Using a recently developed technique for the calculation of the Wiener number (W) of benzenoid systems, we determine explicit expressions for W for several homologous series of pericondensed benzenoid hydrocarbons. An elementary proof for the correctness of the used method is also included.
Klavžar, Sandi, Gutman, Ivan, Rajapakse, Amal   +2 more
openaire   +2 more sources

Iterative estimation of total p-electron energy [PDF]

Journal of the Serbian Chemical Society, 2005
: In this work, the lower and upper bounds for total p-electron energy (E) was studied. Amethod is presented, by means of which, starting with a lower bound EL and an upper bound EU for E, a sequence of auxiliary quantities E0, E1, E2, … is computed ...
LEMI TÜRKER, IVAN GUTMAN
doaj