To investigate the utility of comprehensive GC×GC gas chromatography metabolomics in finding varietal markers among volatile compounds non-aromatic red wines, representative samples two most important Croatian monovarietal Plavac mali and Teran, were subjected to analysis by both conventional chromatography–mass spectrometry (GC-MS) two-dimensional with time-of-flight mass (GC×GC-TOF-MS) after ...

Reactions of dibromocyclopropane 2a, containing two spiro-fused 1,3-dioxane rings, with MeLi gave only the methylation products 8 and 9 even at elevated temperatures. In contrast, the cyclohexane analogue 2b treated with MeLi underwent a smooth rearrangement to bicyclo[1.1.0]butane 11b at -78, -10, or +35 degrees C. Treatment of 2a with PhLi gave the alpha-Ph anion 13 as the only product, which...

Volatile organic compounds (VOCs) from uninfested and infested broccoli plant samples with green peach aphid Myzus persicae were investigated by headspace solid microextraction (HS-SPME) combined gas chromatography mass spectrometry (GC-MS). Overall, 25 identified in plants. The HS-SPME GC-MS analysis of the volatiles described differences between samples. Based on peak area analysis, VOCs sign...

BACKGROUND The brown marmorated stink bug (BMSB) is an exotic insect pest that was first recognized in the United States in 2001. As of today, it has been found in more than 42 states. BMSB has a very broad host plant range and damage to crops in mid-Atlantic States has reached a critical level. A reliable and accurate tool for infestation detection and population monitoring is urgently needed ...

This work was aimed at isolating and characterising biosurfactant producing bacteria strain from diesel oil contamination sites. The potential of the to degrade n-alkanes further studied. Soil samples were collected rich areas, identified strains grown on minimal media that contained as only carbon source. Enrichment culture technique used identify bacteria. Seventeen based their capacity use O...

Biodegradation of crude oil and 7 different distillation products by Ralstonia picketti SRS and Alcaligenes piechaudii SrS was investigated. Crude oil degradation was above 80% after incubation of 20 days for both strains and their mixture. removal of short/long alkanes and BteX investigated was different, from 97% (for hexane degraded by the mixture of the isolates) to 22% (for tridecane degra...

Vibrio cholerae, the causative agent of the disease cholera, uses a cell to cell communication process called quorum sensing to control biofilm formation and virulence factor production. The major V. cholerae quorum-sensing signal CAI-1 has been identified as (S)-3-hydroxytridecan-4-one, and the CqsA protein is required for CAI-1 production. However, the biosynthetic route to CAI-1 remains uncl...