The deep-sea fish leech Bathybdella sawyeri Burreson has recently been collected from two sites on the South East Pacific Rise at approximately14° and 17°S, 2623–2586 m depth. Leeches were obtained from washings of vent mussels Bathymodiolus thermophilus (Mytilidae) and clams Calyptogena magnifica (Vesicomyidae) collected with a grab by a submersible, or were found attached to the cheliped of t...

La universidad se caracteriza por la circulación y producción de ciertos géneros escritos (monografías, informes, proyectos) como uno los modos privilegiados evaluación aprendizajes. Aun tratándose estudiantes que ya han superado distintos niveles educación obligatoria, sus producciones escritas dejan ver deficiencias en cuanto a aspectos básicos normativa lengua general del lenguaje académico ...

THE production of ammonia as their main nitrogenous end-product by flesh-fly larvae is now well known. The mechanism of its production however is still obscure [Messer and McLellan, 1935]. Hobson [1931] for instance was unable to find any evidence of deamination of glycine at PH 6-8 by aqueous extracts of Lucilia sericata larvae. One of us [Brown, 1935] carried out the same experiment using lar...