Salinity-induced effects on transpiration rate, stomatal conductance and leaf area of three olive (Olea europaea L.) varieties

Transpiration of two year-old olive trees of three different varieties, Arbequina, Cobrançosa and Galega (18 trees per variety), irrigated with three levels of salt (0, 80 or 200 mM NaCl) for about 90 days, was measured by a gravimetric method. To determine leaf area, each tree was photographed from the side against a white background and the total area of each projected image was determined with ImageJ software. To calibrate these area determinations, one tree of each variety was subsequently stripped of all its leaves and its total leaf area was accurately measured. A correlation was then obtained between the area on the photograph of this particular tree and the total area of the detached leaves of the same tree. Using the leaf area determined by this procedure, transpiration rates of the trees could be calculated. Knowing leaf and air temperatures and RH, it was possible to determine the difference in molar fraction of water between the leaf and the air. Using this and the values of the transpiration rate, stomatal conductance could be calculated (gs calc) and compared with the conductance measured on the same trees with a porometer (gs). Actual leaf area of a plant was 1,40 (Arbequina), 1,42 (Cobrançosa) or 1,24 (Galega) times the area measured with ImageJ on the photograph of the same plant. Leaf area of the trees, on average of all salt irrigations, was significantly higher on Arbequina (0,187 m2) then on the other two varieties (0,138 m2 or 0,148 m2, for Cobrançosa or Galega, respectively), but did not differ significantly in percentage of controls (0 salt). On average of all three varieties, leaf area was also higher on plants irrigated without salt (0,181 m2) than on plants exposed to 80 or 200 mM NaCl (0,152 m2 or 0,140 m2, respectively), which did not differ between them. The same significant difference was observed when leaf area was expressed as percentage of controls. Transpiration rate was significantly higher on Cobrançosa (1,17 mmol m-2 s-1), on average of all treatments, but there were no significant differences between Arbequina (1,08 mmol m-2 s-1) and Galega (0,82 mmol m-2 s-1). In percentage of controls, there were no significant differences between varieties. Salt reduced significantly the transpiration rate in all varieties, both the actual and percentual values, to about 50% or 30% of controls when exposed to 80 mM or 200 mM NaCl, respectively. Stomatal conductance (gs), assessed by porometry, was significantly higher in control plants, mainly in Cobrançosa (102 mmol m-2 s-1), then in Arbequina (77 mmol m-2 s-1) and the lower values were found in Galega (51 mmol m-2 s-1). Salt reduced gs, on average of the three varieties to 30% or 10% of controls on exposure to 80 mM or 200 mM NaCl, respectively. Calculated (gs calc) and measured (gs) values of stomatal conductance showed a close relation between them (0,967, R2 = 0,837) which indicates this non-destructive method to determine whole-plant leaf area to be reasonably accurate.

A motivação como variável determinante da qualidade de vida no trabalho dos enfermeiros do Hospital do Espírito Santo de Évora E.P.E.

Ser enfermeiro supõe lidar com a ciência do cuidar. Porém, cada vez mais existe a preocupação de que estes profissionais igualmente devem ser cuidados. A qualidade de vida no trabalho deve ser transversal a todas as profissões e todos os trabalhadores, incluindo o assegurar da saúde, segurança e higiene no trabalho, assim como o bom relacionamento entre os colegas, um óptimo ambiente de trabalho e a prevenção de riscos psicossociais; para que a qualidade de vida no trabalho ocorra no seio laboral, a organização deve ter como objectivo a realização pessoal dos trabalhadores na sua profissão. Intrínseca a esta qualidade de vida, a motivação assume um papel preponderante na tomada de decisão dos trabalhadores, e, em particular, nos enfermeiros - existe o impulso que leva as pessoas a desempenharem determinadas actividades, atitudes ou funções. Neste âmbito, foi desenvolvido um estudo que englobou a população de enfermeiros do Hospital do Espírito Santo de Évora, apresentando como objectivo principal a verificação da motivação como variável determinante da qualidade de vida no trabalho desses mesmos profissionais. Foi efectuado um estudo de caso, recorrendo-se a uma metodologia mista para a validação ou não das hipóteses, estabelecendo-se a investigação num método não-experimental. Com este estudo pretende-se criar um instrumento de apoio aos órgãos de gestão do hospital mencionado, assim como às instituições influentes da zona de Évora. ABSTRACT: Being a nurse involves dealing with the science of caring. However, increasingly there is a concern that these professionals also should be well-taken care of. The quality of working life must be transversal to all the professions and all the workers, including assuring health, security and hygiene at work, as well as the good relationship between the colleagues, an excellent working environment and prevention of psychosocial risks; so that the quality of working life occurs within the workplace, the organization must have as its objective the fulfillment of workers in their profession. Intrinsic to this quality of life, motivation assumes a preponderant role in the decision­ making of the workers, and, in particular the nurses- the impulse exists to lead people to perform certain acts, attitudes or functions. ln this context, it was developed a study that involved the nurses in the Hospital do Espírito Santo de Évora E.P.E., presenting as its main objective the verification of motivation as a variable determining the quality of working life of these same professionals. We used a case study, involving a mixed methodology to validate or not the hypotheses, consequentially a non-experimental method in this research. With this research it is intended to create an instrument to support the management of the hospital in study, as well as the influential institutions in the area of Évora.