This paper studies quantity surcharge and heterogeneity in consumer attention, using scanner data in the peanut butter category. Quantity surcharge exists for packaged goods when a smaller package size is cheaper than its larger size counterpart per unit. Quantity surcharges are frequent in the data, and households have heterogeneous purchasing behavior during quantity surcharge weeks: attentiv...

A 1995 outbreak of dengue haemorrhagic fever (DHF) occurred on Samui Island in Thailand with an incidence of almost 500 cases/100,000 population. To find and develop effective strategies to control this disease through cost-effective vector control programs, entomological studies were carried out on the island between 1996 and 1998. There were two species of DHF vectors, Aedes aegypti and Ae. a...

Experiments on in vitro feeding of the hard ticks Ixodes ricinus, Boophilus microplus, Amblyomma variegatum and Amblyomma hebraeum are described. An in vitro test for systemic acaricides is presented. Work started with a feeding chamber continuously supplied with new blood. It proved too susceptible to fungal contamination and not efficient enough. Simple feeding units made of honey jars with a...

The slipper shell snail Crepidula fornicata forms dense assemblages along much of the European coast, where it co-occurs with oysters. We examined the susceptibility of slipper shell larvae to predation by suspension-feeders, including adults of their own species. In particular, we compared filtration rates on phytoplankton with those on larvae, and determined the extent to which consumption of...

The aim of this study was to determine the silage quality and in situ degradability silages prepared with addition grape pomace into variety sorghum-sudan grass as rapid fermentable carbohydrate source. Grape obtained at region ensiled sorghum- sudan grown Keskin Fodder Plants Production Processing Facility same period levels 0, 10, 20 40%. Glass jars (1L) were used for ensiling silages. Four s...