Distortion and orientation of fulleride ions in A(4)C(60)

A(4)C(60) compounds (A = K, Rb, Cs) are good candidates to exhibit the Mott-Jahn-Teller insulating state. We present near-IR and neutron scattering data to reflect molecular and crystal stucture changes with temperature. We show how the size of the cation affects the structural and electronic properties of these compounds

Nonlinear Schrodinger equation with chaotic, random, and nonperiodic nonlinearity

In this paper we deal with a nonlinear Schr\"{o}dinger equation with chaotic, random, and nonperiodic cubic nonlinearity. Our goal is to study the soliton evolution, with the strength of the nonlinearity perturbed in the space and time coordinates and to check its robustness under these conditions. Comparing with a real system, the perturbation can be related to, e.g., impurities in crystalline structures, or coupling to a thermal reservoir which, on the average, enhances the nonlinearity. We also discuss the relevance of such random perturbations to the dynamics of Bose-Einstein Condensates and their collective excitations and transport.Comment: 4 pages, 6 figure

Utilização de porta-enxertos em cultivares de uvas sem sementes no Vale do São Francisco.

O objetivo do presente trabalho foi avaliar a influência de diferentes porta-enxertos sobre a produção e características do fruto nas cultivares Thompson Seedless, Sugraone, Catalunha, Crimson Seedless, Marroo Seedless e Fantasy Seedless nas condições do Submédio do Vale do São Francisco. Foram realizados três experimentos, sendo um no Campo Experimental de Bebedouro, da Embrapa Semiárido, em Petrolina, PE e os demais em um vinhedo comercial no Município de Sento Sé, BA. No experimento 1, foram avaliadas três cultivares copa Thompson Seedless, Catalunha e Sugraone sobre cinco portaenxertos e uma testemunha não enxertada (pé-franco). Os portaenxertos foram Harmony, 420 A, IAC 766, Couderc 1613 e Paulsen 1103. No experimento 2, as cultivares copa foram Crimson Seedless e Marroo Seedless enxertadas sobre os mesmos porta-enxertos. No experimento 3 foram utilizadas as cultivares copa Sugraone, Crimson Seedless e Fantasy Seedless avaliadas sobre os porta-enxertos Paulsen 1103, Harmony, 420 A e SO4. Em todos os experimentos, utilizou se delineamento experimental em blocos com parcelas subdivididas e três repetições, considerando-se como parcela principal as cultivares copa, e como parcelas secundárias, os porta-enxertos. No momento da colheita avaliaram-se as características relacionadas à produção e qualidade dos frutos: produção; massa média de cachos; massa, comprimento e diâmetro médio de bagas; teor de sólidos solúveis totais (SST) (oBrix); acidez total titulável (ATT) (% ácido tartárico) e relação SST/ATT. O vigor das plantas foi mensurado pela massa da parte aérea determinada após a poda. O efeito dos porta-enxertos variou em função das cultivares copa e das condições ambientais e de manejo específicas de cada experimento. De modo geral, as melhores respostas nas cultivares Thompson Seedless e Sugraone foram observadas sobre os porta-enxertos Harmony e Paulsen 1103, enquanto em Marroo Seedless e Crimson Seedless, destacou-se o porta-enxerto IAC 766 para a maioria das características avaliadas. As cultivares Catalunha e Fantasy Seedless foram menos influenciadas pelos porta-enxertos.bitstream/item/56485/1/BPD90.pd

Melhoramento genético da videira.

Classificação botânica; citogenética; biologia flora e reprodução; recursos genéticos; melhoramento genético da videira; biotecnologia aplicada ao melhoramento da videira.bitstream/item/17927/1/SDC224.pd

Influence of cutting on rooting, budding and death of grafting stock grape cv. IAC 766.

In the San Francisco Valleu, the grape crop assumes great social and economic importance. Grape scion growers are greatly interested in any technique that results in maximum yield of scion per plant. This work aimed at evaluating the influence of kind of cutting with variable bud number on rooting, budding and death percentage of grape scions. A trial was carried out at Brazilian Agricultural Research Cooporation nursery at Petrolina,PE, Northeastern Brazil, in a randomized design, with four replications and four treatments: 1) herbaceous cutting with one bud, 2) herbaceous cutting with two buds, 3) ligneous cutting with one bud and 4) ligneous cutting with two buds. Each plot was composed of 25 cutting with two buds. Each plot was composed of 25 cutting and evaluations were performed at 15, 30, 45 and 60 days after planting. Significative differenes occured among treatments by the Tukey test (5% probability level) regarding rooting, budding and death of cuttings. At 60 days after planting, treatments 4, 3, 1 and 2 presented, respectively, 95.98; 95.81; 67.22 and 59.97% of rooting with significant differences between herbaceous (treatments 1 and 2) and ligneous cuttings and ligneour cuttings (treatments 3 and 4). BUdding (90.12; 88.85, 67.99 and 58.97% for treatments 4, 3, 1 and 2, respectively) was lower than rooting. Cutting death for herbaceous cuttings (40.30 and 37.60% in treatments 2 and 1, respectively) was statistically higher than that for ligneous cuttings (2.000% in treatments 3 and 4). Bud (...)