M. Allard – författare

Provides a unique survey of the information contained in the patent literature concerning solvent extraction of nickel and cobalt. All the available data from the patent documentation is classified systematically for easy retrieval of authors, patents or assignees. Presented in three parts, the first deals with leaching of nickeliferous or cobaltiferous sources using organic reagents; the second reviews the solvent extraction of nickel or cobalt, or both from solutions; the third covers solvent extraction methods used to remove impurities from solutions containing nickel or cobalt. Cites over 300 patent documents.

A central concept in the evolutionary theory of senescence is the idea that ageing results from life-history trade-offs. In particular, the disposable soma theory suggests that longevity is determined through the setting of longevity assurance mechanisms so as to provide an optimal compromise between investments in somatic maintenance (including stress resistance) and in reproduction. Comparative studies among mammalian species confirm that cells from long-lived species appear to have a greater intrinsic capacity to withstand stresses than cells from short-lived species. Childbearing at older ages has become increasingly common in modern societies because of demographic changes, medical progress and personal choice. While the detrimental effects of late reproduction on infant mortality and genetic diseases have been well documented, little is known about the possible postponed detrimental effects of late parenting.