260,848 research outputs found
Seminário sobre aquacultura 14 a 16 de dezembro de 1983
No full textA necessidade de desenvolver a aquacultura em Portugal obriga à escolha das espécies mais indicadas para tal finalidade. A propósito o autor chama a atenção para as graves consequências que podem advir das introduções e/ou transferências de animais aquáticos, quer para as espécies locais e meio ambiente, como para a para a saúde pública.Concerning the need to choose the most convenient species to cultivate in order to implement aquaculture in Portugal, the author draws the attention to the deleterious consequences of introductions and transfers of aquatic animals.Caixa Geral de Depósito
Influência do tamanho, da profundidade e densidade de plantio da semente sobre a germinação, vigor e produtividade do gergelim (Sesamum indicum L.).
No full textA cultura do gergelim vem sendo cultivada no Brasil desde a época colonial. Um dos aspectos de relevância diz respeito ao tamanho das sementes a serem utilizadas no plantio. Este trabalho foi conduzido com o propósito de se determinarem os efeitos do tamanho da semente, profundidade e densidade de plantio sobre a germinação, vigor e produtividade do gergelim (Sesamun indicum L.), cultivar "JORI"Dissertação (Mestrado em Agronomia: Fitotecnia) - Universidade Federal do Ceará, Fortaleza. Orientador: Marcos Vinicius Assunção
Murici (Byrsonima crassifolia (L.) Rich.).
No full textEste folder reúne informações simplicadas, sobre o Murici (Byrsonima crassifolia (L.) Rich.). Sintetiza a origem, a descrição da planta, seu cultivo e a parte da planta que mais se utiliza
The vulnerability of ecosystem trophic dynamics to anthropogenically induced environmental change: A comparative approach
No full textThe chapter, "The vulnerability of ecosystem trophic dynamics to anthropogenically induced environmental change: A comparative approach" was written by the listed authors including Jessica L. Clasen (Douglas College Faculty).
The Ecological Dissertations in the Aquatic Sciences (Eco-DAS) symposia bring together 35-40 recent PhD recipients for one week in alternate years. Eco-DAS VIII was held in 2008. Eco-DAS is sponsored by the Center for Microbial Oceanography: Research and Education (C-MORE), the University of Hawai`i School of Ocean and Earth Science and Technology (SOEST) and its Department of Oceanography, and the Association for the Sciences of Limnology and Oceanography (ASLO). The Proceedings of Eco-DAS VIII includes nine chapters published in open access.
We employed a comparative approach to review the vulnerability of the trophic interactions within aquatic systems to global threats associated with anthropogenic activities. The goal of this chapter was to identify and characterize mechanisms by which human-mediated environmental threats may modulate trophic dynamics across aquatic ecosystems. Trophic dynamics include some of the most obvious and pervasive factors influencing ecosystems and were used as a metric because of their importance and commonality across all aquatic environments. Our use of trophic dynamics proved to be insightful, illustrating that the flow of energy through aquatic food webs will be (or already has been) altered by invasive species, land-use change, nutrient loading, exposure to ultraviolet radiation, overharvesting, acidification, and increasing global temperatures. The response of trophic dynamics to these threats was often similar across oceans, estuaries, lakes, and rivers. This similarity proved to be interesting given the differences in both the level of concern expressed by scientists and the predicted variability in environment-specific responses. As the trophic interactions of an ecosystem are at the root of its function and structure, examining trophic dynamics could be an informative method for evaluating the response of aquatic environments to global threats. If future analyses validate the use of trophic dynamics as a metric, it is our hope that trophic dynamics can be used by scientists and politicians to mitigate the effects of human actions.book chapterPublished
Climate and anthropogenic change in aquatic environments: A cross ecosystem perspective
No full textThe chapter, "Climate and anthropogenic change in aquatic environments: A cross ecosystem perspective" was written by the listed authors including Jessica L. Clasen (Douglas College Faculty). The Ecological Dissertations in the Aquatic Sciences (Eco-DAS) symposia bring together 35-40 recent PhD recipients for one week in alternate years. Eco-DAS VIII was held in 2008. Eco-DAS is sponsored by the Center for Microbial Oceanography: Research and Education (C-MORE), the University of Hawai`i School of Ocean and Earth Science and Technology (SOEST) and its Department of Oceanography, and the Association for the Sciences of Limnology and Oceanography (ASLO). The Proceedings of Eco-DAS VIII includes nine chapters published in open access.
In an effort to foster collaboration among researchers across diverse ecosystems, a group of early career scientists whose interests span the aquatic sciences, convened at the University of Hawai’i to participate in the 2008 Eco-DAS symposium. During a break out session of the symposium in which participants were charged with discussing how to best approach mitigation of climate and anthropogenic threats to aquatic ecosystems, participants concluded that effective mitigation will depend upon prioritizing threats across ecosystems. These priorities were documented using a thought experiment in which participants defined their ecosystem of expertise, and then ranked the highest-priority threats to them. Results revealed that marine (open ocean, deep sea, coastal oceans, and rocky intertidal) researchers ranked climate-related impacts (i.e., temperature and ocean acidification) as the highest priority threats whereas estuarine, marsh, wetland, stream, and lake/reservoir researchers ranked the direct anthropogenic impacts of land-use change and nutrient inputs (eutrophication) highest. With such a diverse group, it became apparent that working across ecosystems is limited by issues rang- ing from a lack of large-scale, long-term monitoring to provide baseline data, to broader questions of how changes in one ecosystem cascade across interconnected ecosystems. Here we summarize the discussions, offer insight into the rankings for specific ecosystems, and propose ideas of how past, current, and future research can be used to support a cross-ecosystem perspective on climate and anthropogenic change.book chapterPublished
Phase Measurement in Interacting Fock Space
No full textIn this paper we discuss probability operator measure and phase measurement in one
mode interacting Fock space
Sistema automatizado para cultivo de plantas baseado internet das coisas
No full textThis work consists of developing an indoor greenhouse for growing plants through an
automated system using the principle of the internet of things. Using the control of
temperature variables, air and soil humidity and luminosity, using sensing connected
to the ESP32 platform. The user is given control and access to the status of the
greenhouse, providing an environment for quality cultivation and easy construction.Este trabalho consiste no desenvolvimento de uma estufa indoor para o cultivo de
plantas por meio de um sistema automatizado utilizando o princípio da internet das
coisas. Com o emprego do controle das variáveis de temperatura, umidade do ar e
do solo e luminosidade, utilizando o sensoriamento conectado à plataforma ESP32.
Proporciona-se ao usuário o controle e acesso ao status da estufa, fornecendo um
ambiente para cultivo de qualidade e de fácil construção
Chemically Fueled Self-Assembly in Biology and Chemistry
No full textLife is a non-equilibrium state of matter maintained at the expense of energy. Nature uses predominantly chemical energy stored in thermodynamically activated, but kinetically stable, molecules. These high-energy molecules are exploited for the synthesis of other biomolecules, for the activation of biological machinery such as pumps and motors, and for the maintenance of structural order. Knowledge of how chemical energy is transferred to biochemical processes is essential for the development of artificial systems with life-like processes. Here, we discuss how chemical energy can be used to control the structural organization of organic molecules. Four different strategies have been identified according to a distinguishable physical-organic basis. For each class, one example from biology and one from chemistry are discussed in detail to illustrate the practical implementation of each concept and the distinct opportunities they offer. Specific attention is paid to the discussion of chemically fueled non-equilibrium self-assembly. We discuss the meaning of non-equilibrium self-assembly, its kinetic origin, and strategies to develop synthetic non-equilibrium systems
Determinação de resistência varietal de caupi (Vigna unguiculata (L.) Walp.) armazenado a Callosobruchus maculatus.
No full textO Callosobruchus maculatus constitui-se numa das principais pragas do caupi armazenado. Sua abrangência geográfica atinge quase todas as regiões produtoras determinando prejuízos na ordem de 30% após seis meses de armazenamento e as reduções de preço e comercialização chegam a 81,27% para amostras com 100% de dano. Como os meios tradicionais de controle envolvem altos custos e o poder aquisitivo dos nossos agricultores de caupi e baixo, a utilização da resistência varietal surge como outra alternativa para minimizar os prejuízos causados pela praga. Dentro deste ponto de vista, iniciou-se o teste de 180 cultivares de procedência nacional e internacional, sob condições de laboratório a 27 C e de UR de 60%
Estimativa da área foliar de plantas daninhas: Brachiaria decumbens Stapf. e Brachiaria brizantha (Hochst.) Stapf Leaf area estimative in weeds Brachiaria decumbens Stapf and Brachiaria brizantha (Hochst.) Stapf
No full textCom o objetivo de obter uma equação que, através de parâmetros lineares dimensionais das folhas, permita a estimativa da área foliar de Brachiaria decumbens Stapf. e Brachiaria brizantha (Hochst.) Stapf., estudaram-se correlações entre a área foliar real (Sf) e parâmetros dimensionais do limbo foliar, como o comprimento ao longo da nervura principal (C) e a largura máxima (L), perpendicular à nervura principal. Todas as equações, exponenciais, geométricas ou lineares simples, permitiram boas estimativas da área foliar. Do ponto de vista prático, sugere-se optar pela equação linear simples envolvendo o produto C x L, considerando o coeficiente linear igual a zero. Desse modo, a estimativa da área foliar de B. decumbens pode ser feita pela fórmula Sf = 0,9810 x (C x L), ou seja, 98,10% do produto entre o comprimento ao longo da nervura principal e a largura máxima, enquanto que, para a B. brizantha a estimativa da área foliar pode ser feita pela fórmula SF = 0,7468 x (C x L), ou seja 74,68% do produto entre o comprimento ao longo da nervura principal e a largura máxima da folha.In order to obtain equations which make feasible the leaf area estiomate from linear measures of the leaf blade, correlation studies were done involving the real leaf blade area and main vein leaf lenght (C), maximum leaf width (L) and C*L. All the equations, linear, geometric and exponential, provide good leaf area estimate for both species. In the practical sense, it is suggested the use of the simple linear equation of the regression model using the C*L parameter and taking the linear coefficient equal zero. Then, the Brachiaria decumbens leaf area can be estimate using the equation Sf = 0,9810 (C*L) and the Brachiaria brizantha by using the equation Sf = 0,7468*(C*L)
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