Estágios imaturos de algumas Xylocopa neotropicais (Hymenoptera——Apoidea)

Some simple demonstration experiments involving homopolar motors (Algumas experiências simples de demonstração envolvendo motores homopolares)

The importance and use of carefully selected demonstration experiments in the teaching of physics should not be underestimated. Cliff Swartz, the highly regarded American teacher of physics writes that “Physics instruction without demonstrations is like dinner without food” [1]. Pedagogically, demonstration experiments provide those we teach with an opportunity to gain and develop basic familia...

A gynandromorph of Xylocopa nigrocincta Smith (Hymenoptera: Apidae).

We describe a mixed gynandromorph of Xylocopa (Neoxylocopa) nigrocincta from a single specimen from Argentina. The specimen presents bilateral asymmetry, with the right half of its head displaying male characters and the left half displaying female characters; the mesosoma presents male characters mostly in the right half of the prothorax, pronotal lobe and distal half of the fore tibia and in ...

Systematics and biology of Xylocopa subgenus Schonnherria (Hymenoptera, Apidae) in Argentina

Biological information on the species of the large carpenter bee Xylocopa subgenus Schonnherria occurring in Argentina is revised. Based on the appraisal of museum specimens, the study of type material, and field surveys conducted across 15 provinces between 2007 and 2011, the following seven species are recognized for the country: Xylocopa bambusae Schrottky, Xylocopa chrysopoda Schrottky, Xyl...

Allometry of kinematics and energetics in carpenter bees (Xylocopa varipuncta) hovering in variable-density gases.

We assessed the energetic and aerodynamic limits of hovering flight in the carpenter bee Xylocopa varipuncta. Using normoxic, variable-density mixtures of O(2), N(2) and He, we were able to elicit maximal hovering performance and aerodynamic failure in the majority of bees sampled. Bees were not isometric regarding thorax mass and wing area, both of which were disproportionately lower in heavie...

Vaccination antirougeoleuse: Etude de l'immunité humorale chez les enfants Vaccinés de la région de Tunis