Polycyclic aromatic hydrocarbons (PAHs) and n-alkanes are important specific organic constituents in fine particulate matter (PM2.5). Seventy-five PM2.5 samples were collected Spring Changzhou, to investigate the concentrations sources of (C9–C40) PAHs. The average total PAHs (∑PAHs) (∑n-alkanes) 4.37 ± 4.95 ng/m3 252.37 184.02 ng/m3, ranging from 0.43 22.22 57.37 972.17 respectively. ∑n-alkane...

Insect cuticular hydrocarbons (CHCs) serve as important intersexual signaling chemicals and generally show variation between the sexes, but little is known about generation of sexually dimorphic (SDHCs) in insects. In this study, we report molecular mechanism biological significance that underlie SDHC German cockroach Blattella germanica . Sexually mature females possess more C29 CHCs, especial...

This study aimed to isolate and genotype T. gondii from Brazilian wildlife. For this purpose, 226 samples were submitted to mice bioassay and screened by PCR based on 18S rRNA sequences. A total of 15 T. gondii isolates were obtained, including samples from four armadillos (three Dasypus novemcinctus, one Euphractus sexcinctus), three collared anteaters (Tamandua tetradactyla), three whited-lip...

In spite of the fact that individual races of Botryococcus braunii are widely distributed in lakes, reports of the co-existence of different chemical races are rare. Here we report biomarker evidence for the co-occurrence of three different races of B. braunii (A, B and L) in the water column and sediments of El Junco Lake, a freshwater crater lake at 700 m elevation on San Cristóbal Island, Ga...

Varved sediments from the center of Santa Barbara Basin (SBB) off southern California are a valuable archive for high-resolution climate reconstruction. Using mass spectrometry imaging lipid biomarkers, this study examines interactions perennial upwelling strength and oxygen-driven redox conditions at sediment-water interface 1900 CE to 2009. In SBB, variations in recorded by isoprenoidal tetra...

There is a lack of knowledge on the European bison (Bison bonasus L. 1758) foraging behavior that essential to develop an appropriate feeding strategy for each specific situation (captive or wild). Utilization faecal markers may allow us fill this gap, accommodating animal welfare and intensive labour issues are major limitations traditional techniques. This study aimed evaluate potential n-alk...