100,906 research outputs found
Seleção de isolados de Bacillus spp. para promoção de crescimento vegetal e biocontrole de Thielaviopsis paradoxa.
No full textA utilização de Bacillus spp. para a promoção de crescimento e para o biocontrole de doenças de plantas é uma ferramenta adequada para a sustentabilidade agrícola. Porém existem muitas lacunas neste conhecimento que precisam ser esclarecidas. A promoção de crescimento e a proteção contra Thielaviopsis paradoxa em cana-de-açúcar estão entre os estudos que necessitam ser realizados. O trabalho teve como objetivo a identificação de cepas de Bacillus spp. para os fins anteriormente relacionados. Testes bioquímicos e de inibição de crescimento micelial foram realizados com 60 cepas de Bacillus spp., provenientes de uma coleção depositada na Embrapa Meio Ambiente. Testes de produção de HCN, de ácido indolacético (AIA) e de sideróforos (S), solubilização de fósforo (P), assimilação de nitrogênio (N) e catalase (Ct) relacionados à promoção de crescimento; e pareamento direto in vitro para avaliar a inibição de T. paradoxa foram realizados. Os isolados AP-12 e AP-165 obtiveram valores positivos para os testes HCN, S, P e N. E os isolados AP-106, AP-115 e AP-512 inibiram totalmente o patógeno. Isolados de Bacillus spp. com resultados positivos aos testes citados acima serão utilizados nos estudos in vivo em cana-de-açúcar para tratamento de toletes visando ao controle da podridão abacaxi e a promoção de crescimento
Influência de matéria orgânica no crescimento dos fungos ectomicorrízicos Pisolithus tinctorius e Thelephora terrestris.
No full textForam avaliados os efeitos dos extratos aquosos de lodo de esgoto, torta de filtro, esterco de curral, e acículas de pinus nas concentrações de 1, 10, 100 e 1000 ppm e 1,2,3,4,5,10,15 e 20% (v/v) em MMn-agar (meio de Melin - Norkrans, modificado por Marx), sobre o crescimento micelial dos fungos ectomicorrizicos Pisolithus tinctorius e Thelephora terrestris. Nas concentrações inferiores a 1% não houve efeito significativo de todos os extratos sobre o crescimento dos fungos. Em concentrações superiores a 1000 ppm o extrato de acículas de Pinus reduziu o crescimento tanto de P. tinctorius com T. terrestris. Lodo de esgoto reduziu o crescimento de P. tictorius nas concentrações acima de 1000 ppm. O crescimento de T. terrestris foi também diminuído por lodo de esgoto, mas só em concentracoes acima de 3%. torta de filtro não afetou o crescimento de P. tictorius em qualquer concentração e esterco de curral somente a 20%, reduzindo-o. Esterco de curral e torta de filtro diminuíram o crescimento de T. terrestris em concentrações acima de 4%
Influência de matéria orgânica na formação de ectomicorrizas em mudas de Pinus por Pisolithus tinctorius e Thelephora terrestris.
No full textForam avaliados os efeitos do lodo de esgoto, esterco de curral, torta de filtro e acículas de Pinus incorporados ao solo nas concentracoes de 10%, 30% e 50% (v/v) sobre a formação de ectomicorrizas em mudas de Pinus caribea var. hondurensis inoculadas artificialmente com Pisolithus tinctorius e Thelephora terrestris. O esterco de curral e acículas de Pinus na concentração 10% não afetaram a formação de micorrizas, tanto por P. tinctorius quanto por T. terrestris, ao passo que as concentracoes de 30% e 50% reduziram a simbiose. Lodo de esgoto em todas as concentracoes inibiu a formação de micorrizas por ambos os fungos. Torta de filtro inibiu a associação das mudas de P. caribea va. hondurensis com T. terrestris em todas as concentracoes e nas de 30% e 50% para P. tinctorius
Uniform boundedness for the optimal controls of a discontinuous, non-convex Bolza problem
No full textWe consider a Bolza type optimal control problem of the form min Jt{y,u) :=jf A(s, y(s), u(s)) ds + g{y(T)) Subject to: y G W1,1([t,T];Rn) y = b(y)u a.e. 5 G [t,T], y(t) = x u(s) G U a.e. 5 G [t,T], 1/(5) G 5 Vs G [t,T],where A(s.y.u) is locally Lipschitz in s, just Borel in (y,u), b has at most a linear growth and both the Lagrangian A and the end-point cost function g may take the value +00. If b = 1, g = 0, (Pt,x) is the classical problem of the Calculus of Variations. We suppose the validity of a slow growth condition in u, introduced by Clarke in 1993, including Lagrangians of the type A(s,y, u) = \J 1 + M2 and A(s.y.u) = |u| - y/\u\ and the superlinear case. We show that, if A is real valued, any family of optimal pairs (ym,u.) for (Pt,x) whose energy Jt(y~, is equi-bounded as (t,x) vary in a compact set, has - equibounded controls. Moreover, if A is extended valued, the same conclusion holds under an additional lower semicontinuity assumption on (s, u) 1-> A(s, y, u) and requiring a condition on the structure of the effective domain. No convexity, nor local Lipschitzianity is assumed on the variables (y,u). As an application we obtain the local Lipschitz continuity of the value function under slow growth assumptions
LAGRANGIAN SUBMANIFOLD LANDSCAPES OF NECESSARYCONDITIONS FOR MAXIMA IN OPTIMAL CONTROL:GLOBAL PARAMETERIZATIONS AND GENERALIZED SOLUTIONS
No full textAbstract. We construct global generating functions of the initial and of the evolution Lagrangian sub- manifolds related to a Hamiltonian flow. These global parameterizations are realized by means of Amann– Conley–Zehnder reduction. In some cases, we have to to face generating functions that are weakly quadratic at infinity; more precisely, degeneracy points can occurs. Therefore, we develop a theory which allows us to treat possibly degenerate cases in order to define a Chaperon–Sikorav–Viterbo weak solution of a time- dependent Hamilton-Jacobi equation with a Cauchy condition given at time t = T (T > 0). The starting motivation is to study some aspects of Mayer problems in optimal control theory
Exploiting semantics for constructing and comparing occupational and educational-driven qualifications: the TIPTOE project
No full textIn recent years, mobility of students and workers started to be considered as a way for answering skill shortages in the European labor world. However, in order to implement effective mobility practices, suitable instruments supporting transparency and readability of the outcomes of learning processes as well as of the needs of companies and employers in general have to be developed. In fact, though some instruments have been introduced (like, for instance, the European Qualification Framework, EQF, the European Credit system for Vocational Education and Training, ECVET, etc.), they are often seen as theoretical tools rather than a practical help for involved stakeholders. In this work, the results of the TIPTOE project, a transnational initiative funded by the European Commission under the Lifelong Learning Programme are illustrated. In particular, the semantic-based methodology for the construction of a European-wide profile mixing education and labor worlds perspectives in the trade sector is discussed. Furthermore, a number of tools allowing end-users to compare owned qualifications to the reference one and supporting stakeholders in the reading of national educational and occupational profiles in the EQF dimension are presente
Letter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
Submitochondrial particles as toxicity biosensors of chlorophenols: structure-toxicity correlations
No full textInfluência do lodo de esgoto na severidade da podridão de raiz do sorgo causada por Pythium arrehenomanes.
No full textLodo de esgoto, incorporado ao solo, nas concentacoes de 5, 10 e 15% (v/v) reduziu a severidade da podridao de raiz de plantas de sorgo cultivadas em vaso contendo o solo previamente infestado com micelio de Pythium - arrhenomanes, especialmente nas maiores concentracoes. O lodo de esgoto tambem estimulou o crescimento das plantas, tanto na ausencia como na presenca do patogeno
Industrial district firms do not smile: Structuring the value chain between local and global
No full textDefined as local manufacturing systems, industrial districts have been recog- nized as particularly important for the location of firms’ manufacturing activities intertwined with innovation processes. The debate on the interna- tionalization of production has stressed the low value related to manufactur- ing within value chain activities (smile framework), emphasizing the need to focus on high value-added activities (R&D or marketing). Following multi- national enterprises’ internationalization strategies, also district firms have progressively offshored their production phases in the past years. However, recent studies focused on backshoring have revamped the attention on the domestic control of production for firms’ competitiveness. This chapter explores district firms’ location choices for manufacturing activities between local and global. Based on an empirical analysis of about 260 Italian district firms specialized in mechanics, furniture, and fashion and supported by a case study investigation, our results show that despite district internationali- zation processes, a non-negligible amount of firms still carry out in-house or through outsourcing production activities at district level. Larger firms couple district production and long-term upstream outsourced internationali- zation activities. The district system confirms its role of pooling specialized competences and product know-how, being decisive for firms’ innovation and responsiveness to national and international markets. Backshoring, instead, is a very limited phenomenon and linked to upgrading strategies
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