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Genetic Studies of Influenza A Viruses Circulating in Pigs in Spain
A genetic study of influenza virus circulating in pigs in the north-east of Spain during the period 2006-2007 reveals their belonging to three family subtypes of influenza virus. Most were genetically related to other European strains, indicating...
Photochemistry of Indigo: a long-standing controversy
Although the use of indigo as a dye dates back to at least the 7th century B.C., it was not until the late nineteenth century when its chemical structure was discovered, and 60 years more passed before spectroscopic data was obtained. The indigo molecules are not water...
Factors Affecting Geographic Distribution of Populations
Traditionally, economic theory explains population distribution according to the physical distance from the centres of interest. One study proposes a new methodology which introduces the idea of subjective distance, which also takes into account other variables. In...
The Attention Rats Give their Offspring Protects them Against Stress When they Are Adults
A study with rats shows that in a situation of environmental stress, the mother increases her maternal behaviour toward offspring, trying to compensate them for the stress received. As adults, these offspring have...
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