Y. J. Li, Q. Chen, M. I. Guzman, C. K. Chan, and S. T. Martin Environmental Engineering Program, Hong Kong University of Science and Technology, Hong Kong, China School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA now at: Department of Chemistry, University of Kentucky, Lexington, KY, USA Division of Environment, Hong Kong University of Science and Technology, Hon...

The influence of second-generation products on the particle mass yield of β-caryophyllene ozonolysis was systematically tested and quantified. The approach was to vary the relative concentrations of firstand secondgeneration products by adjusting the concentration of ozone while observing changes in particle mass yield. For all wallloss corrected organic particle mass concentrations Morg of thi...

* ايجولونكت دهعم – دادغب , ينقتلا ميلعتلا ةئيه / دادغب ** مسق ةسدنه نداعملاو جاتنلاا , ةيجولونكتلا ةعماجلا / دادغب *** ايجولونكتلاو مولعلا ةرازو / دادغب 497 مييقت لكآتلا ةمواقم طاسوا يف ةيتيركنوكلا ةناسرخلا ةيوقت يف مدختسملا ديدحلل ةفلتخم ةيئام بوقعي فسوي ثيل * شابك ةرهزلا دبع لحز ** و حلاص دمحم قفوم *** 2010/12/21 خیرات میدقتلا : 2011/6/2 خیرات لوبقلا : ةصلاخلا ف حيلستلا ديدحل ...

The aim of this research was to determine chemical composition and insecticidal activity of the essential oil of Illicium pachyphyllum fruits against two grain storage insects, Sitophilus zeamais and Tribolium castaneum, and to isolate any insecticidal constituents from the essential oil. The essential oil of I. pachyphyllum fruits was obtained by hydrodistillation and analyzed by GC-MS. A tota...

The secondary organic aerosol (SOA) yield of βcaryophyllene photooxidation is enhanced by aerosol acidity. In the present study, the influence of aerosol acidity on the chemical composition of β-caryophyllene SOA is investigated using ultra performance liquid chromatography/electrospray ionization-time-of-flight mass spectrometry (UPLC/ESI-TOFMS). A number of first-, secondand higher-generation...

The essential oils of four Guarea species collected at Manaus (Amazonas, Brazil) were obtained by hydrodistillation and analyzed by GC-MS. Except for one diterpene detected, the compounds identified in the essential oils were hydrocarbons and oxygenated sesquiterpenes. The major sesquiterpenes were alpha-santalene (26.26%) and alpha-copaene (14.61%) from G. convergens branches; caryophyllene ep...

Leaf-cutting ants are pests of great economic importance due to the damage they cause to agricultural and forest crops. The use of organosynthetic insecticides is the main form of control of these insects. In order to develop safer technology, the objective of this work was to evaluate the formicidal activity of the essential oils of two Hyptis pectinata genotypes (chemotypes) and their major c...

In this study, the variability of essential oil composition in different parts of summer savory was investigated. Extraction of essential oils from air-dried leaves and healthy seeds was done using water-distillation in Clevenger-type apparatus for 4 h. In total, 23 and 24 components were identified in the leaves and seeds of summer savory, respectively. Carvacrol (46.023%), Estragole (Methyl C...

The investigation of aroma compounds of the essential oils of dried fruits of black pepper (Piper nigrum) and black and white "Ashanti pepper" (Piper guineense) from Cameroon by means of solid-phase microextraction (SPME) was carried out for the first time to identify the odorous target components responsible for the characteristic odor of these valuable spices and food flavoring products. By m...