|
|
|
|
Bioelectric Field The area of bioelectric field phenomena is rich with studies that may have a direct impact on the health and well-being of humans in the coming years and decades. Some examples of focused research in this science include the examination of the ionic currents in and near the heart, studies of electrical patterns during an active brain seizure and research into the nature of cardiac defibrillation. As in many other fields of endeavor, the recent advances in computing hardware and software development techniques have brought about great demand for more sophisticated simulation tools in this area. Recognizing this need, scientists at the National Institutes for Health (NIH) have undertaken the challenge through the development of a Problem Solving Environment, or PSE, for use in bioelectric field studies. The PSE, dubbed BioPSE, is a great example of integrated computing in a modern simulation setting. A visit to the project web site -- http://www.sci.utah.edu/ncrr/research/re... -- will show that the NIH researchers have divided the problem into three pieces: modeling, simulation, and visualization. In this setting, modeling is described as a quantitative description of the physical features of a human body. In general, such modeling consists of a series of geometric shapes joined together to form a representation of a certain body part or area of the body. Simulation, on the other hand, gives a quantitative description of the function of body structures, utilizing the results of the modeling efforts. Of course, being conceptual creatures, humans have a hard time making heads or tails of piles of numbers, so visualization is an essential piece in order to be able to interpret the results of the modeling and simulation. ---- Bioelectromagnetism (sometimes equated with bioelectricity) refers to the electrical, magnetic or electromagnetic fields produced by living cells, tissues or organisms. Examples include the cell membrane potential and the electric currents that flow in nerves and muscles, as a result of action potentials. It is not to be confused with bioelectromagnetics, which deals with the effect on life from external electromagnetism. Biological cells use bioelectricity to store metabolic energy, to do work or trigger internal changes, and to signal one another. Bioelectromagnetism is the electric current produced by action potentials along with the magnetic fields they generate through the phenomenon of electromagnetism. Bioelectromagnetism is studied primarily through the techniques of electrophysiology. In the late eighteenth century, the Italian physician and physicist Luigi Galvani first recorded the phenomenon while dissecting a frog at a table where he had been conducting experiments with static electricity. Galvani coined the term animal electricity to describe the phenomenon, while contemporaries labeled it galvanism. Galvani and contemporaries regarded muscle activation as resulting from an electrical fluid or substance in the nerves. Bioelectromagnetism is an aspect of all living things, including all plants and animals. Some animals have acute bioelectric sensors, and others, such as migratory birds, are believed to navigate in part by orienting with respect to the Earth's magnetic field. Also, sharks are more sensitive to local interaction in electromagnetic fields than most humans. Other animals, such as the electric eel, are able to generate large electric fields outside their bodies. In the life sciences, biomedical engineering uses concepts of circuit theory, molecular biology, pharmacology, and bioelectricity. Bioelectromagnetism is associated with biorhythms and chronobiology. Biofeedback is used in physiology and psychology to monitor rhythmic cycles of physical, mental, and emotional characteristics and as a technique for teaching the control of bioelectric functions. Bioelectromagnetism involves the interaction of ions. Bioelectromagnetism is sometimes difficult to understand because of the differing types of bioelectricity, such as brainwaves, myoelectricity (e.g., heart-muscle phenomena), and other related subdivisions of the same general bioelectromagnetic phenomena. One such phenomenon is a brainwave, which neurophysiology studies, where bioelectromagnetic fluctuations of voltage between parts of the cerebral cortex are detectable with an electroencephalograph. This is primarily studied in the brain by way of electroencephalograms. It is bio-electromagnetic phenomena that enable migratory birds to travel great distances at the same time each year with the accuracy It is bioelectricity that enables a shark to map the ocean floor
Electricity, defined by Merriam-Webster, is as follows: a
fundamental form of energy observable in positive and negative forms
that occurs naturally (as in lightning) or is produced (as in a
generator) and that is expensed in terms of the movement and
interaction of electrons. |
|
Verification of Individual Identification Method Using Bioelectric Potential of Plant during Human WalkingGraduate School of Science and Engineering, University of Toyama, 3190 Gohuku, Toyama 930-8555, Japan(Received October 4, 2006; accepted December 2, 2006; published online April 5, 2007) In this study, we monitored electromagnetic waves generated by human activity and investigated a method for individual identification by looking at the bioelectric potential of a rubber tree. Four subjects were asked to walk in place at a distance of 60 cm from a rubber tree while we measured variations in the bioelectric potential of the tree as produced by the stepping. The results confirmed that electromagnetic waves generated by a human subject walking in place produce a measurable response in the bioelectric potential of a plant. It was also found that this variation in bioelectric potential varies in synchrony with each subject's walking pace. The spectral envelope of the observed signal was approximated using a straight line and the distribution of the coefficients of this line was plotted. Even for a simple straight-line approximation, we demonstrated that this coefficient distribution varies considerably among individual subjects.
|
|