The Hyperbolic Forest Owner

This paper examines the implications of quasi-hyperbolic inter-temporal preferences to the Faustman model. The use of decreasing discount rates leads to dynamically inconsistent behavior. To solve this problem a two-stages optimization decision model is developed. The resulting actual cutting time will be anticipated compared to the Faustman optimal cutting time. If, alternatively, the equivalent constant rate of discount is the empirically observed discount rate, then the optimal cutting time is the same, but the present value of profits for the hyperbolic forest owner is always higher than the one resulting from the equivalent constant discount rate. All these results apply to both the single and the multiple rotation problems.Hyperbolic discounting; time preference; dynamic inconsistency; Faustman model; optimal rotation

Forest vintages and carbon sequestration

In the current paper we examine the role of forest carbon sequestration benefits in optimal forest management. When carbon benefits are considered not only the forested area is relevant, but also the flow of carbon between land and the atmosphere through the carbon cycle. To account for all these impacts a multi-vintage forest setting is used, following Salo and Tahvonen (2004). The model is extended to three different carbon accounting methods to measure the benefits form carbon sequestration: carbon flow regime, tonne-year crediting and average storage. In the case of the carbon flow regime, the impact on the optimal management and allocation of land will depend upon the amount of carbon released when the forest is harvested. Under the other two accounting systems optimal steady state forest area will be increased, and in cases where optimal management imply cyclical harvesting, considering carbon benefits will always increase cycles dimension.

Uso de vácuo infiltração com Plant Preservative Mixture® (PPM) no cultivo in vitro dos bambus Dendrocalamus asper e Guadua angustifolia a partir de matrizes sob diferentes sistemas de cultivo

TCC (graduação) - Universidade Federal de Santa Catarina. Centro de Ciências Agrárias. Curso de Agronomia.O presente estudo objetivou avaliar a influência de vácuo infiltração de PPM em explantes obtidos a partir de matrizes cultivadas sob diferentes sistemas de cultivos, durante o estádio de introdução in vitro das espécies de bambus lenhosos, Dendrocalamus asper e Guadua angustifolia. O experimento foi implantado e conduzido no Laboratório de Fisiologia do Desenvolvimento e Genética Vegetal (LFDGV), da Universidade Federal de Santa Catarina (UFSC). O delineamento utilizado foi inteiramente casualizado, no qual foram avaliados os seguintes sistemas de cultivo: em cultivo protegido (sala de crescimento), cultivados em substratos comercial - Tropstrato florestal, em cultivo protegido (sala de crescimento) hidropônicos, provenientes do cultivo in vitro por Ornellas et al (2016), para a espécie Dendrocalamus asper e em aquaponia para Guadua angustifolia. Outro fator avaliado foi o uso ou não da vácuo infiltração em meio de cultura líquido contendo PPM (0,5%), totalizando 4 tratamentos para a espécie Dendrocalamus asper e 2 para Guadua angustifólia, conduzidos com 10 - 20 explantes por tratamento. No presente trabalho foi possível verificar que a vácuo infiltração foi eficiente na redução da incidência de contaminação nos diferentes sistemas de cultivo utilizados, trazendo novas perspectivas para outros estudos de cultivo in vitro referentes a essa nova técnica.The present study aimed to evaluate the influence of vacuum infiltration of PPM in explants obtained from matrices grown under different cropping systems. The evaluation was made during the stage of in vitro introduction of species of woody bamboos, Dendrocalamus asper and Guadua angustifolia. The experiment was established and conducted in the Development and Genetics Plant Physiology Laboratory (LFDGV) at Federal University of Santa Catarina (UFSC). The project's design was completely randomized and the following cropping systems were evaluated: in protected cultivation (growth room), grown on commercial substrates - forest Tropstrato in protected cultivation (growth room) hydroponics, from the in vitro culture by Ornellas et al (2016) for Dendrocalamus asper species and aquaponics to Guadua angustifolia. In addiction, was also evaluated the use or not of vacuum infiltration on liquid medium of culture containing PPM (0.5%). Therefore, the study had 4 treatments for Dendrocalamus asper and 2 for Guadua angustifolia, conducted with 10 to 20 explants per treatment. The research indicated that the vacuum infiltration was effective in reducing the incidence of contamination on the growing systems tested, which provides new perspectives to further in vitro cultivation studies regarding this new technique

Development of displacement electrochemical inmunosensors: the case of 2,4,6-trichloroanisole

Development of displacement El objetivo de este trabajo es explorar y explotar los principios de funcionamiento de un Inmunosensor Electroquímico de Desplazamiento [(Displacement Electrochemical Immunosensor (DEI)] y también del ELISA Indirecto Competitivo [(Indirect Competitive ELISA (ICE)] para la detección de 2,4,6-tricloroanisol (TCA). Para tal fin, se lleva a cabo el desarrollo racional de un ELISA Indirecto Competitivo. El ensayo desarrollado resulta capaz de detectar TCA en concentraciones 1ppt a 1 ppm, con un limite de detección de 4.2 ppt. El ensayo desarrollado puede tener un particular interés comercial en situaciones donde el tiempo experimental requerido es de menos de 80 minutos.Se desarrolla también un modelo matemático (MM) cuyo principal objetivo es permitir el desarrollo racional de un Inmunosensor Electroquímico de Desplazamiento (DEI). A pesar de las bajas constantes de afinidad observadas en los anticuerpos obtenidos para este trabajo, se logra desarrollar un DEI funcional cuyo limite de detección de TCA (0.2 ppm) se corresponde con los valores obtenidos a través del MM.La adsorción inespecífica (NSA) de proteínas es identificada como uno de los problemas críticos que impidieron alcanzar limites de detección más bajos. El uso del electroquímicamente compatible Cu UPD como barrera/control de la NSA, junto con la detección amperométrica del desplazamiento son propuestos en este trabajo como base o punto de partida para el desarrollo de inmunosensores que puedan ser operados sin necesidad de marcaje (labelling) o la adición de otros componentes diferentes de la muestra de interés (reagentless and labelless immunosensors).The purpose of this work is to explore and exploit the principles of Displacement Electrochemical Immunosensing (DEI) and Indirect Competitive ELISA (ICE) to detect 2,4,6-trichloroanisole (TCA). The rational design of indirect competitive ELISA for TCA detection is attempted. The developed assay detects TCA at concentrations from 1ppt to 1 ppm, with a limit of detection of 4.2 ppt. The assay can be commercially useful in situations where less than 80 minutes total assay time is required. A mathematical model (MM) is developed for the rational design of an electrochemical displacement immunosensor (DEI). Despite the low affinity constants of the antibodies obtained for this work a functional DEI is developed with the predicted by the MM high limit of detection for TCA (0.2 ppm). The non-specific adsorption (NSA) of proteins is identified as a critical problem inhibiting further optimization of the DEI. The use non-insulating Cu UPD as NSA controller or electrochemically compatible blocking, together with amperometric displacement detection are proposed as a platform that could permit further development of reagentless and labelless immunosensors

Constructing life: old troubles, new challenges for Psychology

This article is focused on the study object of the developmental psychology and career management field, within the context of organizations, and it is analyzed on an historical perspective. The second part revolves around the scientific tools that seek to match the individuals’ needs with the organizations’. In the third part, the principles of life construction paradigm are considered.Facultad de Psicologí

Constructing life: old troubles, new challenges for Psychology

This article is focused on the study object of the developmental psychology and career management field, within the context of organizations, and it is analyzed on an historical perspective. The second part revolves around the scientific tools that seek to match the individuals’ needs with the organizations’. In the third part, the principles of life construction paradigm are considered.Facultad de Psicologí