The chemical composition of oregano essential oil of different origin extracted from oregano plants grown in south-eastern Poland was analysed using the gas chromatography mass spectrometry (GC-MS) and gas chromatography flame ionization detector (GC-FID). The dominant compound was sabinene; its percentage proportion ranged from 10.85% to 25.46%, depending on the ecotype studied. Moreover, the ...

the present study explores the chemical constitution and antioxidant activity of the essential oils of the aerial parts of artemisia dracunculus l. and the flower heads of matricaria chamomilla l. gc-ms analysis revealed the presence of (z)-anethole (51.72%), (z)-β-ocimene (8.32%), methyleugenol (8.06%), limonene (4.94%) and linalool (4.41%) in artemisia dracunculus and (e)-β-farnesene (24.19%)...

Fifteen novel β-lactams bearing the N-ethyl tert-butyl carbamate group 5a-o and fifteen N-(2-aminoethyl) β-lactams 6a-o were synthesized by the ketene-imine [2+2] cycloaddition reaction (Staudinger ). The cycloaddition reaction was found to be totally diastereoselective leading exclusively to the formation of the cis-β-lactam derivatives. These newly synthesized β-lactams were evaluated for the...

       The essential oils of the aerial parts of three different Artemisia species (A.scoparia, A. diffusa, A. turanica ) growing wildly in the northeast of Iran were analyzed by GC-MS. Twe...

Fifteen novel β-lactams bearing the N-ethyl tert-butyl carbamate group 5a-o and fifteen N-(2-aminoethyl) β-lactams 6a-o were synthesized by the ketene-imine [2+2] cycloaddition reaction (Staudinger ). The cycloaddition reaction was found to be totally diastereoselective leading exclusively to the formation of the cis-β-lactam derivatives. These newly synthesized β-lactams were evaluated for the...

Zanthoxylum avicennae (Lam.) DC. is a medicinal and aromatic plant, belong to the genus. The plant found in some Asian contries, including Viet Nam. various parts of this has been used medicine contain essential oils. In study, oil Z. was isolated. Two oils from leaves twigs (Lamk.) collected limestone forest Northern part Vietnam were separately obtained by hydrodistillation analyzed GC-MS. A ...

When attacked by insects, plants release mixtures of volatile compounds that are beneficial for direct or indirect defense. Natural variation of volatile emissions frequently occurs between and within plant species, but knowledge of the underlying molecular mechanisms is limited. We investigated intraspecific differences of volatile emissions induced from rosette leaves of 27 accessions of Arab...

The exotic wood-boring pest, emerald ash borer (EAB), Agrilus planipennis Fairmaire (Coleoptera: Buprestidae), has been threatening North American ash (Fraxinus spp.) resources, this being recognized since its first detection in Michigan, USA and Ontario, Canada in 2002. Ash trees are killed by larval feeding in the cambial region, which results in disruption of photosynthate and nutrient trans...

BACKGROUND Plant material from different organs of Pistacia terebinthus L., (Anacardiaceae) were collected in Kosovo with aim to analyze the chemical variability of the essential oils among native populations and to test them for potential antibacterial activity against Staphylococcus aureus. METHODS Essential oils obtained from leaves, pedicels, fruits and galls were analyzed by GC-FID and G...

The analysis by GC-MS, of the essential oil of the fruits from this species permitted the identification of nine chemical constituents, representing 86.99 % and having as majorities: trans β-ocimene (33.90 %), linalool (23.27 %) and undecanone (16.19 %). The essential oil was submitted to analysis for the verification of the antibacterial activity, by the method of diffusion in paper discs in M...