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NeuroQuantology

Quantum Physics in Living Matter: From Quantum Biology to Quantum Neurobiology

Sultan Tarlacı

Published Dec 8, 2011• 12 citations
Publisher

Abstract

For years, quantum physics was seen as the physics of non-living matter. Thus, when biological living things were discussed, this sequence always came to the fore: biology > organism> organs> tissue> biochemistry> physics> classical mechanics + quantum mechanics. It can be seen that there was a reduction to the lower structures, and that at the base one reaches the level of particles such as atoms and molecules. But when the physico-chemical level is reached, it can be seen that many quantum mechanical events are taking place in living things, and that in fact these are quite normal reactions.

DOI
10.14704/nq.2011.9.4.443

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For years, quantum physics was seen as the physics of non-living matter. Thus, when biological living things were discussed, this sequence always came to the fore: biology > organism> organs> tissue> biochemistry> physics> classical mechanics + quantum mechanics. It can be seen that there was a reduction to the lower structures, and that at the base one reaches the level of particles such as atoms and molecules. But when the physico-chemical level is reached, it can be seen that many quantum mechanical events are taking place in living things, and that in fact these are quite normal reactions.
Introduction Key features of quantum mechanics are the uncertainty principle, wave–particle duality, quantization of energies and the modification of classical probability laws. Biology is concerned with how natural systems function – from understanding how genetically coded information is replicated, to attaining a mechanistic model for complex multistep reactions. Recently researchers have been asking whether quantum mechanics, normally the domain of physics, is also needed to understand some biological processes. This field includes fascinating developments in theory and experiment, as well as multidisciplinary discussion, and the state-of-the-art is documented in this book. Erwin Schrödinger, in his famous book What is Life ? (Schrödinger, 1944), noted that quantum mechanics accounts for the stability of living things and their cellular processes because of our understanding, via quantum mechanics, of the stability and structure of molecules. The fact that quantum effects create, sometimes large, energy gaps between different states of a chemical system is also important. Such energy gaps, between electronic energy levels, enable living organisms to capture and store the energy carried from the sun by photons, and to visualize the world around them via optically induced chemical reactions. Davydov's view in Biology and Quantum Mechanics (Davydov, 1982) was that quantum mechanics is most relevant for isolated systems in pure states and therefore is of little importance for biological systems that are in statistical states at thermal equilibrium.
Quantum biology is the study of quantum effects on biochemical mechanisms and biological function. Quantum physics describes the behaviour of the nanoscale particles that make up all matter including living organisms, but it was generally believed that the ‘warm, wet and noisy environment’ in living organisms would result in decoherence making it impossible for meaningful quantum effects to occur. However, there is now a substantial body of work supporting that nature has actually adapted in such a way as to exploit quantum properties to enhance cellular functioning and is believed to have role in a diverse range of key processes in living organisms ranging from maintaining the stability of DNA to neuron function to conscious cognition; from light harvesting in photosynthesis to avian magnetic field based navigation. This review aims to summarize the various mechanisms and functions in living organisms believed to utilize quantum mechanics to purposefully and effectively enhance their performance, and to explore the potential this could hold in diagnosing and treating various medical conditions.
Quantum mechanics is the science dealing with the behaviour of matter and energy on the scale of atoms and subatomic particles/waves. The majority of the biological processes involving the conversion of energy into forms usable for chemical transformations are quantum mechanical in nature. The chapter “Quantum Mechanics in Biology” presents the basic concepts and postulates of quantum systems, including the probabilistic and non-local nature of quantum systems, and introduces the mathematical formalism to describe quantum mechanics. Finally, the chapter works out some well-known biological processes governed by quantum physics.
Probably no theory in the history of science has produced such a profound cultural and scientific revolution as is determined by quantum mechanics. Founded around 1920 by illustrious physicists, all Nobel Prize winners, it has completely subverted the conception of matter and the universe. The theory that all matter is made up of atoms has already been formulated by Greek philosophers, starting with Democritus. Quantum mechanics provided a description based on a new conception of the elementary structure of atoms, and formulated the fundamental laws to which atoms obey. Quantum theory has obtained the unanimous and shared consent of the scientific world, although some aspects have not been definitively confirmed. Strengthened by the universal acceptance of his theories, quantum mechanics claims its intellectual primacy over all the other sciences, and the scientific world seems to grant it, so much so as to archive all the knowledge and achievements gathered in its thousand-year history. From the epistemological point of view all established theories are worthy of consideration and must be shared and accepted until proven groundless. Dating, quantum mechanics still enjoys the consent of many scientists, but this does not mean that it can claim to be the repository of all truth, based on an unacceptable and anti-scientific syllogism for which: A) all organic and inorganic matter is formed by atoms and molecules; B) quantum mechanics has founded theories and formulas to which atoms and molecules obey; C) accordingly quantum mechanics can control all universal matter. But the presumption of its predominance goes further than willing to dominate living matter. In this article we are going to examine with a sharp criticism, the aberrant and anti-scientific claim of this discipline to dominate not only science but also universal matter. We propose a more moderate and considered vision of the observable natural phenomena and consider them events in continuous evolution, and to adapt our hypotheses and theories with an equal evolutionary approach.
The penetration of quantum concepts into biological science, which began shortly after the creation of quantum mechanics, over the past two decades has taken shape in a new interdisciplinary scientific discipline quantum biology. One of the key questions of quantum biology has been formulated as follows: are there biological systems that use quantum effects to perform a task that cannot be done classically? More broadly, do some kinds of organisms adapt efficient quantum mechanisms in the process of their evolutionary development in order to gain an advantage over their competitors? The range of topical problems of the new discipline discussed in this brief review includes questions of a general, historical and methodological character, and generalizes some theoretical models aimed at describing quantum processes, including bacterialphotosynthesis, bird magnetoreception, and the mechanism of olfactory sense in living organisms.