Testing physiologically-based resource allocation rules in laboratory experiments with Daphnia magna Straus

The rules governing the allocation of available resources to varying physiological processes are evaluated in three physiologically-based models of individual Daphnia. In laboratory experiments using a single clone, subjected to varying regimes of food deprivation, growth was found to vary inversely with food level, ceasing in the absence of food, implying that growth allocation is derived directly from food. Reproductive investment was reduced under food deprivation, ceasing at low food levels. By exposing juvenile and adult daphnia to varying food deprivation regimens during different periods within their intermoult interval, it was shown that instar durations vary as a function of body size and food availability independent of the age of the animal. For the first time, the role of variable instar duration, which critically influences physiological processes such as growth, moulting and reproduction in adult females, that has been neglected by existing Daphnia models, is explicitly incorporated in a physiological allocation model. The consequent model provides a simplified framework for modelling the consequences of food deprivation in cladocerans which has important application in population modelling and environmental risk assessment.EC - STEP and Environment ProgrammesEV5V-CT91-0009EV5V-CT94-0422FCTPRAXIS programBritish Counci

Inseminação Artificial em Tempo Fixo (IATF).

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An approach to comfort in 3D printed clothing

A prototipagem rápida (3D) tem se apresentado como uma promissora técnica de produção. Diante do fato, diversas questões surgem com relação a mudança nos processos de produção, nomeadamente a percepção do conforto nos produtos obtidos por esta tecnologia. O presente artigo faz uma revisão acerca do conforto, das técnicas de impressão 3D e apresenta uma breve reflexão entre o conforto e os produtos vestíveis.The rapid prototyping (3D) has become a promise of production techniques. Faced with the fact, several questions arise regarding the change in the production process, namely the perception of comfort in the products obtained by this technology. This paper reviews the background of 3D printing techniques and presents a brief reflection between comfort and wearable products.info:eu-repo/semantics/publishedVersio

Spin and Charge Josephson effects between non-uniform superconductors with coexisting helimagnetic order

We consider the spin and charge Josephson current between two non-uniform Fulde-Ferrel-Larkin-Ovchinnikov superconductors with helimagnetic order. We demonstrate that the presence of the helimagnetic phase generates a spin Josephson effect and leads to additional contributions to both single-particle and Josephson charge current. It is shown that for such systems the AC effect differs more radically from the DC effect than in the case of a BCS superconductor with helimagnetic order considered earlier in the literature [M. L. Kuli\'c and I. M. Kuli\'c, Phys. Rev. B {\bf 63}, 104503 (2001)] where a spin Josephson current has also been found. In our system the most interesting effect occurs in the presence of an external magnetic field and in absence of voltage, where we show that the charge Josephson current can be tuned to zero while the spin Josephson current is non-vanishing. This provides a well controlled mechanism to generate a spin supercurrent in absence of charge currents.Comment: final versio