1 The pine shoot beetle, Tomicus piniperda (L.) (Coleoptera: Scolytidae), is an exotic pest of pine, Pinus spp., and was first discovered in North America in 1992. 2 Although primary attraction to host volatiles has been clearly demonstrated for T. piniperda, the existence and role of secondary attraction to insect-produced pheromones have been widely debated. 3 Currently, commercial lures for T. piniperda include only the host volatiles a-pinene in North America and a-pinene, terpinolene and (þ)-3-carene in Europe. Several potential pheromone candidates have been identified for T. piniperda. 4 We tested various combinations of host volatiles and pheromone candidates in Michigan, U.S.A., and Ontario, Canada, to determine an optimal blend. 5 Attraction of T. piniperda was significantly increased when trans-verbenol (95% pure, 3.2% cis-verbenol content) was added with or without myrtenol to a-pinene or to blends of a-pinene and other kairomones and pheromone candidates. 6 Our results, together with other research demonstrating that trans-verbenol is produced by T. piniperda, support the designation of trans-verbenol as a pheromone for T. piniperda. A simple operational lure consisting of a-pinene and trans-verbenol is recommended for optimal attraction of T. piniperda.

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Socioeconomic status explains many ethnic disparities in health; however, mechanisms are hard to identify. Fatigue-a frequent complaint in patients and normals-is associated with poorer quality of life. We wondered if ethnicity and social class interact to explain fatigue. A total of 40 African Americans (AAs) and 64 Caucasian Americans (CAs) completed short forms of the Profile of Mood States (POMS-SF) and Multidimensional Fatigue Symptom Inventory (MFSI-SF). Participants were divided into high-middle and low social class groups (as per Hollingshead, 1958a). After controlling for gender, body mass index, depressive symptoms, and response bias, ethnicity and social class interacted for POMS-SF fatigue. AAs in the high-middle classes reported more fatigue than AAs in the low classes and CAs in the high-middle classes. Fatigue did not differ by class for CAs nor by ethnicity in the lower classes. Similar findings emerged for MFSI-SF general fatigue. Social class is important for understanding fatigue in AAs but not CAs.

A relationship has been observed between increasing ethanol content in gasoline and increased particulate matter (PM) emissions from direct injection spark ignition (DISI) vehicles. The fundamental cause of this observation is not well understood. One potential explanation is that increased evaporative cooling as a result of ethanol's high HOV may slow evaporation and prevent sufficient reactant mixing resulting in the combustion of localized fuel rich regions within the cylinder. In addition, it is well known that ethanol when blended in gasoline forms positive azeotropes which can alter the liquid/vapor composition during the vaporization process. In fact, it was shown recently through a numerical study that these interactions can retain the aromatic species within the liquid phase impeding the in-cylinder mixing of these compounds, which would accentuate PM formation upon combustion. To better understand the role of the azeotrope interactions on the vapor/liquid composition evolution of the fuel, distillations were performed using the Advanced Distillation Curve apparatus on carefully selected samples consisting of gasoline blended with ethanol and heavy aromatic and oxygenated compounds with varying vapor pressures, including cumene, p-cymene, 4-tertbutyl toluene, anisole, and 4-methyl anisole. Samples collected during the distillation indicate an enrichment of the heavy aromatic or oxygenated additive with an increase in initial ethanol concentration from E0 to E30. A recently developed distillation and droplet evaporation model is used to explore the influence of dilution effects versus azeotrope interactions on the aromatic species enrichment. The results suggest that HOV-cooling effects as well as aromatic species enrichment behaviors should be considered in future development of predictive indices to forecast the PM potential of fuels containing oxygenated compounds with comparatively high HOV.NREL/CP-5400-71336. Posted with permission.