Palha de sorgo associada ao herbicida imazamox no controle de plantas daninhas na cultura da soja em sucessão

Os resíduos vegetais de uma cultura de cobertura de outono/inverno podem interferir na infestação das plantas daninhas das culturas de verão subseqüentes. Dessa forma, com o objetivo de avaliar o efeito da palha de híbridos de sorgo (Sorghum bicolor), associada ao uso do herbicida imazamox, no controle de plantas daninhas na cultura da soja (Glycine max), cv. 'Conquista', em sucessão, foi conduzido no ano agrícola 2000/2001 um experimento em Uberlândia-MG. Foram utilizados quatro tipos de cobertura: três provenientes de resíduos culturais de híbridos de sorgo (Sara, DKB 860 e Ambar) e uma sem restos vegetais (anteriormente sob pousio). Aos 24 dias após aplicação do herbicida, o controle das espécies Leonotis nepetifolia, Alternanthera tenella, Amaranthus hibridus, A. retroflexus, A. spinosus, Ipomoea grandifolia, Commelina benghalensis e Nicandra physaloides foi mais eficaz nas palhas dos híbridos Sara e Ambar, na ausência de imazamox, com porcentagens de controle de 40 e 41%, respectivamente. Quando associada a 15 g ha-1 de imazamox, a palha do Ambar resultou em melhor controle dessas espécies de plantas daninhas, com controle de 76%; e a 30 g ha-1 a palha do DKB 860 foi a mais eficaz, promovendo 85% de controle. Sem cobertura do solo, com 30 g ha-1 de imazamox obteve-se controle de 62,5%, e 47,5% com metade da dosagem. Os resultados indicaram variabilidade de controle em relação ao híbrido de sorgo estudado e a possibilidade de redução de dosagens do herbicida imazamox quando associado aos resíduos vegetais de sorgo.Plant residues of a fall/winter coverage crop can influence weed infestation of the subsequent summer crops. This research was carried out to evaluate the effects of mulch from several sorghum (Sorghum bicolor) hybrids plus the herbicide imazamox on the control of the subsequent weed infestation of soybean crop (Glycine max cv. 'Conquista'). The experiment was carried out in the 2000/2001 crop year in Uberlândia, MG. Four types of mulch were used, three from sorghum hybrid residues (Sara, DKB 860 and Ambar) and one without residues (no previous winter crop). Twenty-four days after the application of imazamox, the control of the species Leonotis nepetifolia, Aternanthera tenella, Amaranthus hibridus, A. retroflexus, A. spinosus, Ipomoea grandifolia, Commelina benghalensis, and Nicandra physaloides was more effective with the use of Sara or Ambar mulch without the herbicide, with 40 and 41% of control, respectively. When associated to 15 g ha-1 of imazamox, Ambar mulch resulted in better efficiency, with 76% of control. DKB 860 combined with 30 g ha-1 of imazamox was the most efficient treatment, providing 85% of weed control. Without soil coverage, 62.5% of control was achieved with 30 g ha¹ of imazamox and 47.5% with 15 g ha-1. The results indicated wide control variability in relation to the sorghum hybrid used and possibility of imazamox dose reduction when associated to sorghum residues

EasyPET: A novel concept for an affordable tomographic system

The easyPET concept described here aims to reduce complexity and cost of preclinical Positron Emission Tomography (PET) scanners. The system, original in its principle and realisation, is based on a single pair of detectors and a rotating mechanism with two degrees of freedom reproducing the functionalities of an entire PET ring. The characterisation of a 2D imaging prototype, realised to assess the easyPET concept, is presented in this paper. In particular, a spatial resolution of 1\ub10.1. mm and a sensitivity of 0.1% with an energy threshold of 80. keV have been measured. These encouraging results, compared to the performances of commercial preclinical PET, motivate the feasibility study of a 3D system

Potential protein markers in children with Autistic Spectrum Disorder (ASD) revealed by salivary proteomics

The lack of specific pharmacological therapy for Autistic Spectrum Disorder (ASD) and its clinical heterogeneity demand efforts directed toward the identification of biomarkers to aid in diagnosis. Proteomics offers a new perspective for studying the altered proteins associated with autism spectrum disorders (ASD) and we have saliva as an easy-to-collect biological fluid with important biomolecules for investigating biomarkers in various diseases. In this sense, saliva could be used to identify potential biomarkers of ASD. In the current work, saliva samples were collected from children with different degrees of ASD and healthy children and proteomics approaches were applied to generate data on differentially expressed proteins between groups which will serve as a basis for future validation studies as protein markers. Data are available via ProteomeXchange with identifier PXD030065. As results, 132 proteins were present in 80% of the saliva pools of all analyzed groups. Twenty-five proteins were identified as overexpressed in the group of severe and mild/moderate ASD carriers, among which, eight were identified as potential biomarkers for ASD