Biomimetic Nanotechnology Vol. 2

Biomimetic nanotechnology relates to the most basic aspects of living systems, and the transfer of their properties to human applications [...]

Dominating lengthscales of zebrafish collective behaviour

Collective behaviour in living systems is observed across many scales, from bacteria to insects, to fish shoals. Zebrafish have emerged as a model system amenable to laboratory study. Here we report a three-dimensional study of the collective dynamics of fifty zebrafish. We observed the emergence of collective behaviour changing between ordered to randomised, upon adaptation to new environmental conditions. We quantify the spatial and temporal correlation functions of the fish and identify two length scales, the persistence length and the nearest neighbour distance, that capture the essence of the behavioural changes. The ratio of the two length scales correlates robustly with the polarisation of collective motion that we explain with a reductionist model of self–propelled particles with alignment interactions.

Towards a mathematical theory of behavioral human crowds

The first part of our paper presents a general survey on the modeling, analytic problems, and applications of the dynamics of human crowds, where the specific features of living systems are taken into account in the modeling approach. This critical analysis leads to the second part which is devoted to research perspectives on modeling, analytic problems, multiscale topics which are followed by hints towards possible achievements. Perspectives include the modeling of social dynamics, multiscale problems and a detailed study of the link between crowds and swarms modeling.

Recurrent, nonequilibrium systems and the Markov blanket assumption

Markov blankets –statistical independences between system and environment– have become popular to describe the boundaries of living systems under Bayesian views of cognition. The intuition behind Markov blanket originates from considering acyclic, atemporal networks. In contrast, living systems display recurrent interactions that generate pervasive couplings between system and environment, making Markov blankets highly unusual and restricted to particular cases.

Navigating Extinction: Zen Buddhism and Eco-Anarchism

What can esoteric knowledge and spiritual practices from the East teach us about the deep psychological roots of domination and hierarchy? In what ways have ancient Buddhist sages acted as anarchist exemplars and deep ecologists long before these traditions began in the West? How might these anarchistic spiritual traditions inform our approaches to work in education, expand our notions of community, help us navigate ecological collapse, and contribute to our efforts to sustain living systems and rekindle our connection to the myriad sentient inhabitants of the places we live beyond the reaches of capital and the State? This paper will examine the anti-doctrine doctrine of Zen Buddhism as a concrete and embodied system of thought and practice for seeing through the delusions of the ego and the psychological and cultural conditioning these delusions engender. What will also be acknowledged is the general lack of attention this spiritual tradition has given to the capitalistic, authoritarian, and anti-ecological systems that tap into and flow from these delusions. It will be argued that these experiential approaches to overcoming the tyranny of the ego have significant implications for loosening the grip of hierarchical thinking, capitalist hyper-consumption, centralized systems of obedience and command, and human destruction of the biosphere.

Multi-micron crisscross structures from combinatorially assembled DNA-origami slats

Living systems achieve robust self-assembly across length scales. Meanwhile, nanofabrication strategies such as DNA origami have enabled robust self-assembly of submicron-scale shapes.However, erroneous and missing linkages restrict the number of unique origami that can be practically combined into a single supershape. We introduce crisscross polymerization of DNA-origami slats for strictly seed-dependent growth of custom multi-micron shapes with user-defined nanoscale surface patterning. Using a library of ~2000 strands that can be combinatorially assembled to yield any of ~1e48 distinct DNA origami slats, we realize five-gigadalton structures composed of >1000 uniquely addressable slats, and periodic structures incorporating >10,000 slats. Thus crisscross growth provides a generalizable route for prototyping and scalable production of devices integrating thousands of unique components that each are sophisticated and molecularly precise.

Boundaries and borders gone! But life goes on

Unlike machines, living systems are distinguished by the continual destruction and regeneration of their boundaries and other components. Stable Markov blankets may be a real feature of the world, or they may be merely a construction of particular models, but they are neither a feature of organisms nor of any model that can capture the necessary conditions of their existence.

Sustainability, evaluation and industry trends

Sustainability has been defined as “the process of living within the limits of available physical, natural, and social resources in ways that allow the living systems in which humans are embedded to thrive in perpetuity” (Sustain SU, 2010). Hence, in terms of environmental sustainability, there needs to be a focus on the use of renewable rather than non-renewable resources. And even with renewable resources, there needs to be a focus on avoiding over-utilisation and wastage. Sustainability is about more than just ‘being green’. It is about doing things efficiently and effectively, being innovative and creating a positive impact, achieving excellence, and leaving lasting legacies.

Introduction: Three Kinds of Engagement

To change the course of the unsustainable trends of American Prosperity, we must change the social climate of injustice that allows it to continue. This change entails three operations: create an interpretive framework that covers the key components of our living systems, tell coherent stories that include past injustices and places to repair them, and create a civic space that enables us to create a climate of justice. The four components of the interpretive framework are the Earth, our humanity, the social, and the civic. The historical narratives are stories guided by the principle of coherence, which reveal opportunities to change the current course of history. Making such changes involves civilians entering civic spaces where they can invite citizens to care for justice and for future generations.