Search results for "Hymenaea"
showing 2 items of 2 documents
The never-ending story of geologically ancient DNA: was the model plantArabidopsisthe source of Miocene Dominican amber?
2013
Studies characterizing geologically ancient DNA in plants are rare, and all have reportedly obtained plastid DNA sequences from Miocene fossils in a remarkable state of preservation. Recently, a group made the extraordinary claim of having amplified a geologically ancient Miocene plastid DNA fragment (the rbcL gene) from Dominican amber nuggets, and the organismal source of this DNA was identified as Hymenaea protera (Fabaceae), the plant that produced the fossilized Dominican amber. Assuming that the Miocene sequence is error-free, reanalysis of the sequence indicates it is probably a technical artifact or an rbcL pseudogene. Furthermore, BLAST similarity searches and phylogenetic analyses…
Ageing behaviour and analytical characterization of the Jatobá resin collected from Hymenaea stigonocarpa Mart.
2009
Abstract This paper reports the results of an analytical study to characterize the trunk resin collected from the Hymenaea stigonocarpa Mart. species from the region of Minas Gerais (Brazil), popularly known as Jatoba resin. Hymenaea resins are reported to have been used in artistic applications such as protective varnishes in polychromed sculptures and paintings. Therefore, the identification of the main chemical changes that take place in the resin when it is prepared as a thin film exposed to atmospheric effects have been considered herein. Changes due to the degradation effect of light have been studied on a series of specimens prepared as a thin films and subjected to accelerated UV li…