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Genetic Divergence in Mango and Obtaining Minimum Efficient descriptors

American Journal of Plant Sciences 2013年第12期4卷 2318-2322页

作者： Sandra da Costa Preisigke adryellison lemes de campos Nadsley Seraglio Souza Leonarda Grillo Neves Marco Antonio Aparecido Barelli Petterson Baptista da Luz Kelly Lana Araújo Severino de Paiva Sobrinho Agronomy department Mato Grosso State University Cáceres Brazil Plant Breeding department Mato Grosso State University Cáceres Brazil

Mangifera indica (mango) is a typically tropical fruit with considerable economic value. Brazil features a wide variety of cultivars of this fruit, most of which are known under several different names. Indeed, the nomenclature of mango varieties is still quite confusing. Up to now there has been no well-defined scientific principle to differentiate them. The objective of the present work is to compare the different clustering methods in assessing genetic divergence among mango accessions, as well as identify the minimum efficient descriptors for that crop. A total of 20 mango accessions in Cáceres, Mato Grosso state, Brazil were evaluated. When building dissimilarity matrices, the descriptors were divided according to the following groups: leaf, flower/inflorescence, fruit, seed and growth habit/ripening period. With these divisions, combinations were performed among the groups of descriptors. The similarity index was used to obtain the dissimilarity matrices. Later, the accessions were clustered using the methods of Tocher, Ward and UPGMA. The study observed that it was possible to reduce the number of descriptors from 64 to 35, and that the clustering methods were compatible with the study of the genetic diversity of mango.

关键词： Mango Multicategorical Variables Morphological descriptors

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Evaluation of Biodegradation in Aqueous Medium of Poly(Hydroxybutyrate-Co-Hydroxyvalerate)/Carbon Nanotubes Films in Respirometric System

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Journal of Renewable Materials 2019年第2期7卷 117-128页

作者： Larissa Stieven Montagna Isabela CÉSAR Oyama Rita de CÁSSIA Barbosa Camargo Lamparelli Ana Paula Silva THAIS Larissa do Amaral Montanheiro Ana Paula lemes Federal University of São Paulo(UNIFESP) Institute of Science and TechnologyTechnology Laboratory of Polymers and Biopolymers(TecPBio)Talim330São Josédos CamposSP12231-280BrazilSão Josédos CamposSPBrazil

Biodegradable polymers have been increasingly used for scientific and commercial applications because they are similar to some conventional thermoplastics and exhibit the ability of ***(3-hydroxybutyrate-co-3-hydroxyvalerate)(PHBV)nanocomposites films with 1 and 2 wt% of carbon nanotubes(CNT)were prepared by solution mixing,followed by solvent *** this work,PHBV/CNT nanocomposites were submitted to biodegradation in an aqueous medium for 34 days through a respirometric ***,the PHBV films were analyzed by the CO2 production and mineralization as a response of a microbial attack,which was monitored by back titration during all the *** films were also characterized by measuring the weight loss;crystallinity was evaluated by differential scanning calorimetry(DSC)and the surface morphology by scanning electron microscopy(SEM).By analyzing the weight loss of the films,it was observed that adding CNT increases the resistance to biodegradation *** obtained values of CO2 production and mineralization of the samples,as well as the values of weight loss,showed that the biodegradation of PHBV/CNT nanocomposites was minor in comparison to neat *** addition of CNT in PHBV matrix influences the surface morphology,causing the presence of cavities and an increase of roughness.

关键词： Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) carbon nanotube nanocomposites biodegradation in aqueous medium

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