Browsing by Subject "Desecación"

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    Drenaje y crecimiento agrícola en la España mediterránea (1500-1800)
    (Murcia : Editora Regional de Murcia, 1997) Lemeunier, Guy; Editora Regional de Murcia
    Por razones de relieve, suelo y climatología abundan las zonas húmedas litorales o interiores en el cuadrante sureste de la Península. Su explotación avanzó lentamente durante la Edad Media, a causa de la débil ocupación humana i después de la Reconquista. En cambio, cuando aumente la presión demográfica y empiece a crecer el peligro del paludismo, es decir, a partir del siglo XVIII, se crean las condiciones para el despegue del proceso de drenaje y puesta en cultivo que reducirán drásticamente la extensión de dichas zonas.
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    Effect of trehalose and other compounds on the resistance to desiccation by Candida utilis cells
    (Murcia: Universidad de Murcia, Servicio de Publicaciones, 1987) Lapeña, M.A.; Pardo, C.; Gacto Fernández, Mariano José; Facultad de Biología
    As other yeasts, Candida utilis intracellularly accumulates trehalose as reserve carbohydrate. Stationary-phase cells show higher resistance to the loss of viability by desiccation than log-phase cells when subjected to a lyophilization protocol. This finding correlates with the fact that resting cells contain higher levels of endogenous trehalose than exponentially growing cells. The number of resulting viable cells can be increased by addition of exogenous trehalose inmediately before the desiccation treatment. These results suggest a protective role for trehalose in addition to the previously assumed of serving as energy source. The comparison of the protective effect of trehalose on cell death by dehydration to that developped by other compounds indicates that such a role is neither exclusive of this sugar nor dependent of its nonreducing character. Other disaccharides and glycerol can be even more effective in preventing loss of viability by desiccation. However, taking into account that trehalose is the only disaccharide endogenously accumulated, the physiological significance of this effect appears to be relevant.