Teor de clorofila e NDVI de soja em resposta ao ataque do percevejo-marrom, Euschistus heros.

Foram realizados experimentos com objetivo de avaliar a resposta da planta de soja a diferentes intensidades de infestação do percevejo marrom, Euschistus heros, em relação ao teor de clorofila (SPAD) e ao NDVI

Brazilian banana crop: current situation and research challenges.

Brazil is the worlds fifth largest producer of bananas, with 7.3 million Mg, 503 thousand ha and average yield of 14.6 Mg ha-1. The country also holds an important market with unique characteristics. In the Northern and Northeastern regions, AAB varieties such as Pacovan, Dwarf Prata and Terra dominate. In the Southeastern region, AAB Prata, Dwarf Prata and Maçã and AAA Cavendish type, in that order. In the Southern region, Cavendish varieties and the Prata type, and, in the Midwest, Prata type and Maçã. In the main banana producing centers of the country, in general, the climatic conditions are suitable, except for water limitation in the North of Minas Gerais, Medium and Submedium São Francisco in Bahia, Submedium São Francisco at Pernambuco, Jaguaribe-Apodi in Ceará and Mossoró/Açú in Rio Grande do Norte, overcome with the use of irrigation; and low temperatures in São Paulo and in the South. Research with the crop began in 1925 in São Paulo, and became more consistent after the 1970s. The Brazilian system of agricultural research is constituted by the Brazilian Agricultural Research Company, state research companies, federal and state universities and other research, teaching and extension institutions. More than a fifth of the 453 articles published in leading scientific journals in Brazil, in the last 20 years, developed the theme improved genotypes. The Brazilian Banana Breeding Program, coordinated by Embrapa Cassava and Fruits, began in 1983 and made available to farmers several genotypes, since 1995. In the North of the country, where black Sigatoka is present and there are climatic conditions favorable to the pathogen, there was greater adoption the new genotypes. The banana crop in Brazil has evolved greatly in recent decades, due to the generation, adaptation and diffusion of technology, but also the organization of banana growers. Some highly technified production centers emerged, especially in irrigated areas, disseminating information and functioning as showcases positive for producers

Incidência de fungos fitopatogênicos em sementes de caupi em Petrolina-PE, em diferentes temperaturas.

Suplemento, ref. 224. Edição dos Resumos do XXXV Congresso Paulista de Fitopatologia, Jaguariúna, fev. 2012

Stability of gold nanowires at large Au-Au separations

The unusual structural stability of gold nanowires at large separations of gold atoms is explained from first-principles quantum mechanical calculations. We show that undetected light atoms, in particular hydrogen, stabilize the experimentally observed structures, which would be unstable in pure gold wires. The enhanced cohesion is due to the partial charge transfer from gold to the light atoms. This finding should resolve a long-standing controversy between theoretical predictions and experimental observations.Comment: 7 pages, 3 figure