‘Genetic Coding’ Reconsidered : An Analysis of Actual Usage

I thank George Pandarakalam for research assistance; Hans-Jörg Rheinberger for hosting my stay at the Max Planck Institute for History of Science, Berlin; and Sahotra Sarkar and referees of this journal for offering detailed comments. Funded by the Wellcome Trust (WT098764MA).Peer reviewedPublisher PD

Localization under the effect of randomly distributed decoherence

Electron transport through disordered quasi one-dimensional quantum systems is studied. Decoherence is taken into account by a spatial distribution of virtual reservoirs, which represent local interactions of the conduction electrons with their environment. We show that the decoherence distribution has observable effects on the transport. If the decoherence reservoirs are distributed randomly without spatial correlations, a minimal degree of decoherence is necessary to obtain Ohmic conduction. Below this threshold the system is localized and thus, a decoherence driven metal-insulator transition is found. In contrast, for homogenously distributed decoherence, any finite degree of decoherence is sufficient to destroy localization. Thus, the presence or absence of localization in a disordered one-dimensional system may give important insight about how the electron phase is randomized.Comment: 8 pages, 5 figure

Statistical model for the effects of phase and momentum randomization on electron transport

A simple statistical model for the effects of dephasing on electron transport in one-dimensional quantum systems is introduced, which allows to adjust the degree of phase and momentum randomization independently. Hence, the model is able to describe the transport in an intermediate regime between classic and quantum transport. The model is based on B\"uttiker's approach using fictitious reservoirs for the dephasing effects. However, in contrast to other models, at the fictitious reservoirs complete phase randomization is assumed, which effectively divides the system into smaller coherent subsystems, and an ensemble average over randomly distributed dephasing reservoirs is calculated. This approach reduces not only the computation time but allows also to gain new insight into system properties. In this way, after deriving an efficient formula for the disorder-averaged resistance of a tight-binding chain, it is shown that the dephasing-driven transition from localized-exponentially to ohmic-linear behavior is not affected by the degree of momentum randomizing dephasing.Comment: 6 pages, 7 figure

DNA, Inference, and Information

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A willow drawing from 1786 : the earliest depiction of intraspecific trait variation in plants?

Acknowledgements I thank Kasey Barton and two anonymous reviewers for valuable suggestions and references.Peer reviewedPostprin

On the 'transmission sense of information'

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Scientific modelling with diagrams

An earlier version of this paper was presented at two workshops in 2016 (“Many Methods, One Biology?”, Munich, and “Representing Scientific Results”, Kassel). I thank participants for stimulating discussions. Special thanks to Christian Joas, Tilmann Massey, Robert Meunier, Kärin Nickelsen, and Raphael Scholl. I would also like to acknowledge the helpful comments by three anonymous reviewers. Springer/Nature and Elsevier granted permissions to reproduce copyrighted material.Peer reviewedPublisher PD