Systematic analysis of pT -distributions in p + p collisions

A systematic analysis of transverse momentum distribution of hadrons produced in ultra-relativistic p + p collisions is presented. We investigate the effective temperature and the entropic parameter from the non-extensive thermodynamic theory of strong interaction. We conclude that the existence of a limiting effective temperature and of a limiting entropic parameter is in accordance with experimental data.Comment: 9 pages, 5 figure

Linear stability analysis of morphodynamics during tissue regeneration in plants

One of the key characteristics of multicellular organisms is the ability to establish and maintain shapes, or morphologies, under a variety of physical and chemical perturbations. A quantitative description of the underlying morphological dynamics is a critical step to fully understand the self-organising properties of multicellular systems. Although many powerful mathematical tools have been developed to analyse stochastic dynamics, rarely these are applied to experimental developmental biology. Here, we take root tip regeneration in the plant model system Arabidopsis thaliana as an example of robust morphogenesis in living tissue, and present a novel approach to quantify and model the relaxation of the system to its unperturbed morphology. By generating and analysing time-lapse series of regenerating root tips captured with confocal microscopy, we are able to extract and model the dynamics of key morphological traits at cellular resolution. We present a linear stability analysis of its Markovian dynamics, with the stationary state representing the intact root in the space of morphological traits. This analysis suggests the intriguing co-existence of two distinct temporal scales during the process of root regeneration in Arabidopsis. We discuss the possible biological implications of our specific results, and suggest future experiments to further probe the self-organising properties of living tissue

Acaricidal activity of palm oil on Aceria guerreronis (Acari:Eriophyidae) and a nontarget predator.

The coconut mite,Aceria guerreronisKeifer (Acari: Eriophyidae), is a severe andubiquitous pest of coconut plantations worldwide. Vegetable oils contain fatty acids that areactive against a variety of agricultural pests; however, little is known about their efficiency incontrollingA. guerreronisas well as their adverse effects on its natural enemies. Here, weassessed the chemical profile of palm oil as well as its toxicity and repellence to bothA.guerreronisandTyphlodromus ornatusDenmark and Muma (Acari: Phytoseiidae), a naturalenemy of the pest. Oleic, palmitic, and linoleic acids accounted for over 85% of palm oil fattyacid composition. Also, palm oil was approximately 4-fold more toxic to the coconut mite thanto its predator. Furthermore, the lethal concentration percentage (LC)50and LC99of palm oilindicated greater activity against the coconut mite than to its predator. Therefore, by exhibitinghigher toxicity and repellence to the coconut mite, with substantial selectivity to the predatorT.ornatus, palm oil is a promising tool to be integrated in the control ofA. guerreronisin coconutplantations

Quantum Theory contents insertion in High School curricula

A inovação científica e tecnológica do século XX foi esmagadora. Contudo, a nossa experiência docente permite-nos afirmar que as aprendizagens na escola secundária estão longe de acompanhar a evolução que se verifica na sociedade atual. No entanto, já estão a ser incluídos alguns conteúdos de Física Moderna nos currículos oficiais de vários países, parecendo evidenciar uma preocupação em atualizar a preparação dos jovens para o mundo que os rodeia. Neste artigo relatamos um estudo que fizemos acerca dos currículos de Física de alguns países, sobretudo no que diz respeito à Teoria Quântica, a grande invenção do século XX, tentando identificar os conteúdos selecionados e a maneira como estes se integram nas orientações curriculares gerais.In the XXth century, scientific and technological innovation has been overwhelming. Our teaching profession lead us to believe that studies in High Schools do not follow the evolution of ideas that characterizes our modern society. However, some contents of Modern Physics are already included in the official curricula of several countries, which seem to be worried about the improvement of today’s youth training. In this paper we report a study made about Physics’ curricula in several countries, emphasizing Quantum Theory issues, the biggest invention of the XXth century, trying to identify the selected subjects selected and the way they fit into general curricula orientations

Guardiões da Comunidade Tanque Novo (Casa Nova-BA).

Esse trabalho teve como objetivo identificar os guardiões de variedades locais da Comunidade Tanque Novo, em Casa Nova?BA. A metodologia consistiu na aplicação de ferramentas participativas e questionários com agricultores familiares. Foi registrada a existência de 21 guardiões de 78 variedades locais, conservadas há pelo menos 10 anos, de abóbora (1), capim (10), feijão (10), leucena (2), mandioca (29), melancia (13), milho (5) e palma forrageira (8). Constatou-se que 79,5% das sementes tiveram como origem os parentes, amigos ou vizinhos e que as principais utilizações são para alimentação da família e de animais

Taxonomic insights and Its type cyclization correlation of VolaTile sesquiterpenes in vitex species and potential source insecticidal compounds: a review.

Sesquiterpenes (SS) are secondary metabolites formed by the bonding of 3 isoprene (C5) units. They play an important role in the defense and signaling of plants to adapt to the environment, face stress, and communicate with the outside world, and their evolutionary history is closely related to their physiological functions. This review considers their presence and extensively summarizes the 156 sesquiterpenes identified in Vitex taxa, emphasizing those with higher concentrations and frequency among species and correlating with the insecticidal activities and defensive responses reported in the literature. In addition, we classify the SS based on their chemical structures and addresses cyclization in biosynthetic origin. Most relevant sesquiterpenes of the Vitex genus are derived from the germacredienyl cation mainly via bicyclogermacrene and germacrene C, giving rise to aromadrendanes, a skeleton with the highest number of representative compounds in this genus, and 6,9-guaiadiene, respectively, indicating the production of 1.10-cyclizing sesquiterpene synthases. These enzymes can play an important role in the chemosystematics of the genus from their corresponding routes and cyclizations, constituting a new approach to chemotaxonomy. In conclusion, this review is a compilation of detailed information on the profile of sesquiterpene in the Vitex genus and, thus, points to new unexplored horizons for future research

Seleção intra-populacional em bucha vegetal.

Suplemento. Edição dos Anais do 52 Congresso Brasileiro de Olericultura, Salvador, jul. 201

Seleção de bucha vegetal visando produção de artesanato.

Foram avaliadas 254 progênies de polinização livre (PLs) de bucha vegetal visando selecionar frutos adequados para a confecção de artesanatos. As progênies foram avaliadas para as características: produtividade de fibra seca (ProdFi); peso da fibra seca(PFF); formato do fruto (FormF); tipo de fibra na região medial do fruto (TFP); tipo de fibra na região proximal (TFP); tipo de fibra na região distal (TDP); resiliência da bucha seca (RBS) e formato do bacalhau (FormB). A PL 34.5 apresentou maior ProdFi (778,7g) e PFF (59,9g), mas a fibra é muito macia, não sendo recomendado para confecção de artesanatos. As PLs 19.9, 47.2 e 57.6, apresentaram melhor FormF (respectivamente 1, 0,99 e 0,98cm), pois resultados próximos a 1 indicam frutos cilíndricos. No entanto, se a finalidade for fabricar tapetes, o ideal seria bucha com formatos cônicos, ou seja, tipo bacalhau. Assim, as PLs 35.8, 34.10 e 35.5 se destacam para este fim. Para as características TFM, TFD e TFP, a PL 35.4 e 47.8 tiveram maior destaque, visto que apresentaram fibra muito dura. Já as PLs 6.2, 6.6, 34.6, 38.5 e 49.5 tiveram maior resiliência em relação às outras. No geral, as PLs 35.4 e 47.8 se destacam para a confecção de artesanatos por apresentarem fibra muito dura e ProdFi superior à média da população original (128,7g). Para a fabricação de tapetes tipo peixe, são recomendadas as progênies 35.8, 34.10 e 35.5. As melhores progêneis podem ser usadas diretamente pelos agricultores ou em programas de melhoramento da espécie