Biophysics is an interdisciplinary science using methods of, and theories from, physics to study biological systems. Biophysics spans all levels of biological organization, from the molecular scale to whole organisms and ecosystems. Biophysical research shares significant overlap with biochemistry, nanotechnology, bioengineering, agrophysics, and systems biology. It has been suggested as a bridge between biology and physics.
Molecular biophysics typically addresses biological questions similar to those in biochemistry and molecular biology, but more quantitatively. Scientists in this field conduct research concerned with understanding the interactions between the various systems of a cell, including the interactions between DNA, RNA and protein biosynthesis, as well as how these interactions are regulated. A great variety of techniques are used to answer these questions.
Fluorescent imaging techniques, as well as electron microscopy, x-ray crystallography, NMR spectroscopy, atomic force microscopy (AFM) and small-angle scattering (SAS) both with X-rays and neutrons (SAXS/SANS) are often used to visualize structures of biological significance. Conformational change in structure can be measured using techniques such as dual polarisation interferometry, circular dichroism, SAXS and SANS. Direct manipulation of molecules using optical tweezers or AFM, can also be used to monitor biological events where forces and distances are at the nanoscale. Molecular biophysicists often consider complex biological events as systems of interacting units which can be understood through statistical mechanics, thermodynamics and chemical kinetics. By drawing knowledge and experimental techniques from a wide variety of disciplines, biophysicists are often able to directly observe, model or even manipulate the structures and interactions of individual molecules or complexes of molecules.
In addition to traditional (i.e. molecular and cellular) biophysical topics like structural biology or enzyme kinetics, modern biophysics encompasses an extraordinarily broad range of research, from bioelectronics to quantum biology involving both experimental and theoretical tools. It is becoming increasingly common for biophysicists to apply the models and experimental techniques derived from physics, as well as mathematics and statistics (see biomathematics), to larger systems such as tissues, organs (e.g. see cardiophysics), populations and ecosystems. Biophysics is now used extensively in the study of electrical conduction in single neurons, as well as neural circuit analysis in both tissue and whole brain.
In comparison with other branches of biology and physics, biophysics is relatively new and, therefore, still evolving. Some of the earliest studies in biophysics were conducted in the 1840s by a group known as the Berlin school of physiologists. Among its members were pioneers such as Hermann von Helmholtz, Ernst Heinrich Weber, Carl F. W. Ludwig, and Johannes Peter Müller.
Focus as a subfield
Generally, biophysics does not have university-level departments of its own, but has presence as groups across departments within the fields of molecular biology, biochemistry, chemistry, computer science, mathematics, medicine, pharmacology, physiology, physics, and neuroscience. What follows is a list of examples of how each department applies its efforts toward the study of biophysics. This list is hardly all inclusive. Nor does each subject of study belong exclusively to any particular department. Each academic institution makes its own rules and there is much overlap between departments.
- Biology and molecular biology - Almost all forms of biophysics efforts are included in some biology department somewhere. To include some: gene regulation, single protein dynamics, bioenergetics, patch clamping, biomechanics.
- Structural biology - Ångstrom-resolution structures of proteins, nucleic acids, lipids, carbohydrates, and complexes thereof.
- Biochemistry and chemistry - biomolecular structure, siRNA, nucleic acid structure, structure-activity relationships.
- Computer science - Neural networks, biomolecular and drug databases.
- Computational chemistry - molecular dynamics simulation, molecular docking, quantum chemistry
- Bioinformatics - sequence alignment, structural alignment, protein structure prediction
- Mathematics - graph/network theory, population modeling, dynamical systems, phylogenetics.
- Medicine and neuroscience - tackling neural networks experimentally (brain slicing) as well as theoretically (computer models), membrane permitivity, gene therapy, understanding tumors.
- Pharmacology and physiology - channelomics, biomolecular interactions, cellular membranes, polyketides.
- Physics - negentropy, stochastic processes, covering dynamics.
- Quantum biophysics involves quantum information processing of coherent states, entanglement between coherent protons and transcriptase components, and replication of decohered isomers to yield time-dependent base substitutions. These studies imply applications in quantum computing.
- Agronomy and agriculture
Many biophysical techniques are unique to this field. Research efforts in biophysics are often initiated by scientists who were traditional physicists, chemists, and biologists by training.
- Biophysical Society
- Index of biophysics articles
- List of publications in biology – Biophysics
- List of publications in physics – Biophysics
- List of biophysicists
- Outline of biophysics
- Biophysical chemistry
- European Biophysical Societies' Association
- Medical biophysics
- Membrane biophysics
- Molecular biophysics
- Careers in Biophysics brochure, Biophysical Society
- Roland Glaser. Biophysics: An Introduction. Springer; 23 April 2012. ISBN 978-3-642-25212-9.
- Donald R. Franceschetti. Applied Science - 5 Volume Set. SALEM PressINC; 15 May 2012. ISBN 978-1-58765-781-8. p. 234.
- Joe Rosen; Lisa Quinn Gothard. Encyclopedia of Physical Science. Infobase Publishing; 2009. ISBN 978-0-8160-7011-4. p. 49.
- Perutz MF (1962). Proteins and Nucleic Acids: Structure and Function. Amsterdam: Elsevier. ASIN B000TS8P4G.
- Perutz MF (1969). "The haemoglobin molecule". Proceedings of the Royal Society of London. Series B 173 (31): 113–40. Bibcode:1969RSPSB.173..113P. doi:10.1098/rspb.1969.0043. PMID 4389425.
- Dogonadze RR, Urushadze ZD (1971). "Semi-Classical Method of Calculation of Rates of Chemical Reactions Proceeding in Polar Liquids". J Electroanal Chem 32 (2): 235–245. doi:10.1016/S0022-0728(71)80189-4.
- Volkenshtein M.V., Dogonadze R.R., Madumarov A.K., Urushadze Z.D. and Kharkats Yu.I. Theory of Enzyme Catalysis.- Molekuliarnaya Biologia (Moscow), 6, 1972, pp. 431–439 (In Russian, English summary. Available translations in Italian, Spanish, English, French)
- Philip Nelson (2014). Biological Physics: Energy, Information, Life: With new art by David Goodsell. W. H. Freeman and Co.
- Rodney M. J. Cotterill (2002). Biophysics : An Introduction. Wiley. ISBN 978-0-471-48538-4.
- Sneppen K, Zocchi G (2005-10-17). Physics in Molecular Biology (1 ed.). Cambridge University Press. ISBN 0-521-84419-3.
- Glaser, Roland (2004-11-23). Biophysics: An Introduction (Corrected ed.). Springer. ISBN 3-540-67088-2.
- Hobbie RK, Roth BJ (2006). Intermediate Physics for Medicine and Biology (4th ed.). Springer. ISBN 978-0-387-30942-2.
- Cooper WG (2009). "Evidence for transcriptase quantum processing implies entanglement and decoherence of superposition proton states". BioSystems 97 (2): 73–89. doi:10.1016/j.biosystems.2009.04.010. PMID 19427355.
- Cooper WG (2009). "Necessity of quantum coherence to account for the spectrum of time-dependent mutations exhibited by bacteriophage T4". Biochem. Genet. 47 (11–12): 892–910. doi:10.1007/s10528-009-9293-8. PMID 19882244.
- Goldfarb, Daniel (2010). Biophysics Demystified. McGraw-Hill. ISBN 0-07-163365-0.
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- Biophysical Society
- Journal of Physiology: 2012 virtual issue Biophysics and Beyond
- Link archive of learning resources for students: biophysika.de (60% English, 40% German)
- Journal of Medicine, Physiology and Biophysics, International Institute of Science, Technology, Education (IISTE), USA. Chief Editor of the journal is Ignat Ignatov.