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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...
Comprehension of Passive Sentences by patients with Broca’s Aphasia
Patients with Broca's aphasia not only suffer deficits in language production, but also have difficulty in understanding. A recent study has focused on the understanding of active and passive sentences with or without explicit agent...
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