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This paper proposes a systemic perspective for some aspects of bothphylogenesis and ontogenesis, in the light of the notion of biologicalorganization as negative entropy, following some hints by Schroedinger. To thispurpose, we introduce two extra principles to the thermodynamic ones, which are(mathematically) compatible with the traditional principles, but have nomeaning in inert matter. A traditional balance equation for metabolism will bethen extended to the new notion as specified by these principles. We considerfar from equilibrium systems and we focus in particular on the production ofglobal entropy associated to the irreversible character of the processes. Aclose analysis of this term will be carried on, both in terms of a diffusionequation of biomass over complexity and, as a complementary approach and as atool for specifying a source term, in connection to Schroedinger's method forhis equation in Quantum Mechanics. We borrow from this equation just theoperatorial approach and, this, in a classical frame, as we use realcoefficients instead of complex ones, away thus from the mathematical frame ofquantum theories. The first application of our proposal is a simplemathematical reconstruction of Gould's complexity curve of biomass overcomplexity, as for evolution. We then elaborate, from the existence ofdifferent time scales, a partition of ontogenetic time, in reference to entropyand negative entropy variation. On the grounds of this approach, we analyzemetabolism and scaling laws. This allows to compare various relevantcoefficients appearing in these scaling laws, which seem to fit empirical data.Finally, a tentative and quantitative evaluation of complexity is proposed,also in relation to some empirical data (caenorhabditis elegans).

Biological Organization and Negative Entropy: Based on Schroedinger's reflections