Comparative biology: Naked ambition

Higher-Ambition CEOs Need Higher-Ambition Boards

Comparative Biology

■ Abstract Polymorphism, or variation within species, is common in all kinds of data and is the major focus of research on microevolution. However, polymorphism is often ignored by those who study macroevolution: systematists and comparative evolutionary biologists. Polymorphism may have a profound impact on phylogeny reconstruction, species-delimitation, and studies of character evolution. A v...

A Challenge, an Ambition

t h g e p w U m w a w m Portuguese gastroenterology, either at national and international levels, and will stand as an element of prestige for all of us. This is a short term goal within our reach. Portuguese gastroenterologists will surely rise up for the challenge. As Director of the GE Portuguese Journal of Gastroenterology I wish, first of all, to assume that I consider this challenge a gre...

Comparative Biology of Anxiety

Anxiety is pre-eminently the psychical reaction which characterizes the human, as opposed to the subhuman mind, and the civilized as opposed to the savage man. The capacity for anxiety is closely parallel with intelligence-the Greek Prometheus (' forethought') who stole fire from heaven and was condemned to have his bowels gnawed by an eagle is a strikingly apt allegorical representation of fac...

Integrative and Comparative Biology

Synopsis Flies of the genus Arachnocampa are sit-and-lure predators that use bioluminescence to attract flying prey to their silk webs. Some species are most common in rainforest habitat and others inhabit both caves and rainforest. We have studied the circadian regulation of bioluminescence in two species: one found in subtropical rainforest with no known cave populations and the other found i...