Polymerase chain reaction (PCR)-based detection strategies were adopted to examine the etiology and vectorship of pear decline in Taiwan (PDTW). 16S rDNA sequences were amplified from total DNAs prepared from PDTW-affected pear trees Pyrus serotina Rehd. cv. Hengshan and pear psyllid Cacopsylla chinensis using PCR. According to the sequence analyses, C. chinensis carried phytoplasmas of two 16S...

En el presente artículo autor presenta los principales conceptos relativos a la epistemología, ciencia y búsqueda de verdad desde óptica Bunge, Tarski, Popper Kuhn. Conceptos que vincula con una noción instrumental del derecho objetivo responder pregunta si existe o no relación entre epistemología Derecho, acerca qué tipo sería tal. Sobre esa base, un criterio escéptico concluye destacando rele...

The sequence of events which occurs during the ripening of the Passe-Crassane pear fruit have been previously studied. In this work, we have investigated the ripening of another climacteric fruit (Pyrus malus L. cv Golden Delicious) and of a nonclimacteric fruit (Prunus avium L. cv Bigarreau Napoléon). We show that both climacteric fruits exhibit the same preclimacteric sequence of events. Diff...