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cell theory


  • WordNet 3.6
    • n cell theory (biology) the theory that cells form the fundamental structural and functional units of all living organisms; proposed in 1838 by Matthias Schleiden and by Theodor Schwann
    • ***
Webster's Revised Unabridged Dictionary
    • Cell theory (Biol) a theory, according to which the essential element of every tissue, either vegetable or animal, is a cell; the whole series of cells having been formed from the development of the germ cell and by differentiation converted into tissues and organs which, both in plants and animals, are to be considered as a mass of minute cells communicating with each other.
    • Cell theory (Biol) See Cellular theory, under Cellular.
    • ***


In literature:

Schleiden and Schwann, Cell-theory of.
"Darwin and Modern Science" by A.C. Seward and Others
Hence, the establishment of the cell theory, in normal biology, was swiftly followed by a "cellular pathology," as its logical counterpart.
"Science and Education" by Thomas H. Huxley
SCHWANN, THEODOR, German physiologist, born at Neuss; made several discoveries in physiology, and established the cell theory (1810-1882).
"The Nuttall Encyclopaedia" by Edited by Rev. James Wood
The centre theory and the cell and neurone theory seemed obligatory starting-points.
"A Psychiatric Milestone" by Various
If these theories be true, what, it may be asked, is the agency that causes the dendrites to contract or the neuroglia cells to expand?
"Scientific American Supplement, No. 1178, June 25, 1898" by Various
We shall see in his treatment of the cell-theory clear indications of his physiological turn of mind.
"Form and Function" by E. S. (Edward Stuart) Russell
The theory that light acts directly on the chromatophoric cells has been proved to be incorrect.
"The Dawn of Reason" by James Weir
The cell theory was for some time combated by the most eminent German men of science.
"A History of the Nineteenth Century, Year by Year" by Edwin Emerson
Dr. Montgomery on the Cell Theory.
"Buchanan's Journal of Man, October 1887" by Various
Theorie refutant celle de M. Darwin.
"Life of Charles Darwin" by G. T. (George Thomas) Bettany
If this theory were true, then a brain in middle age would be unable to function because of the impossibility of renewing its cells.
"The Goat-gland Transplantation" by Sydney B. Flower
It is to nature what in Weismann's theory the germ plasm is to the somatic cell.
"Monophysitism Past and Present" by A. A. Luce
The usual theory is, that cells fill up by repeated use, and, becoming smaller, render the bees raised in them diminutive.
"Soil Culture" by J. H. Walden
It is new in the sense in which Schwann's Cell Theory was new to Physiology, or Dalton's Atomic Theory to Chemistry.
"Malplaquet" by Hilaire Belloc
Another curious application of the selenium cell has been attempted, but has scarcely gone beyond the domain of theory.
"Electricity and Magnetism" by Elisha Gray
A theory of heredity must be reconciled with the cell theory.
"The Biological Problem of To-day" by Oscar Hertwig
The generally accepted theory is that it was a pagan altar which some hermit afterwards converted into a cell.
"Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 7" by Various
My space is too limited to enter into any of the theories as to the possibility of the pigment cells playing a part in colour vision.
"Old Flies in New Dresses" by Charles Edward Walker
Theories: (a) of voltaic cells, (b) of electrolysis.
"Physics" by Willis Eugene Tower
Theories are also being developed about the mechanisms which control and regulate receptor and enzymatic activities within the cell.
"Significant Achievements in Space Bioscience 1958-1964" by National Aeronautics and Space Administration

In news:

"Splinter Cell Chaos Theory" is one game that was created using 3DS Max.
TOM CLANCY'S SPLINTER CELL CHAOS THEORY Developed and published by Ubisoft for Xbox, Playstation 2, GameCube, Windows 2000/XE only.
According to the theory, human cells die and are replaced.
Bone marrow is where immune-system cells are generated, so transplanting mutant bone-marrow cells would render the patient immune to HIV into perpetuity, at least in theory.

In science:

Matching the LPB theory at the cell boundary [140], one derives the effective interaction potential v(r) = λ∗2 /ǫK0 (κr), where κ and λ∗ are renormalized according to the cell model prescription.
Effective interactions between electric double-layers
Of course, in the full QCD theory (i.e. beyond perturbation theory) the perturbative divergences are regularized by small physical cutoffs related to hadron masses and the finite experimental resolution (size of calorimeter cells, energy thresholds, etc.).
The QCD and Standard Model Working Group: Summary Report from Les Houches
However, in a proper quantum theory the cells should likely be regarded as indistinguishable bosonic degrees of freedom.
Dual Branes, Discrete Chain States and the Entropy of the Schwarzschild Black Hole
Therefore in the weakly coupled string-theory limit, where gs → 0, the cell volume becomes infinitesimally small while the number of cells approaches infinity N → ∞ when keeping the brane volume fixed.
Dual Branes, Discrete Chain States and the Entropy of the Schwarzschild Black Hole
It is known in Probability Theory that, if m = c √S, c > 0 then the average number of cells with at least two pellets equals c2 (1/2 + ◦(1) ), where S goes to ∞ ; see Kolchin, Sevast’yanov and Chistyakov, 1976.
Using Information Theory Approach to Randomness Testing
A stable homotopy theory (like the homotopy category of spectra or chain complexes) yields a groupoid-enriched category B in which 2-cells are tracks, i. e. homotopy classes of homotopies.
The characteristic cohomology class of a triangulated category
Danger Theory The idea is that the artificial cells release signals describing their status, e.g. safe signals and danger signals.
Next Challenges in Bringing Artificial Immune Systems to Production in Network Security
All of these cells calculate a danger level and adapt their internal behavior accordingly - implementation of the danger theory.
Next Challenges in Bringing Artificial Immune Systems to Production in Network Security
In information theory this technique is known as “writing in memory with defective cells”.
Wet Paper Coding for Watermarking of Binary Images
This theory has a lot of applications, because of the high number of situations that can be described with the chaotic iterations: neural networks, cellular automata, multi-processor computing, and more generally any aggregation of cells (such as pictures, movies, sounds).
Chaotic iterations and topological chaos
Then we review classical theoretical work on cell motility: early calculations of the speed of a swimmer with prescribed stroke, and the application of resistive-force theory and slender-body theory to flagellar locomotion.
The hydrodynamics of swimming microorganisms
Measurements of force together with quantitative observation of cell motion motivate the development of detailed hydrodynamic theories that can constrain or rule out models of cell motion.
The hydrodynamics of swimming microorganisms
In the limit where cells do not interact with each other hydrodynamically, the response of a cell population to an external shear can be quantified using Batchelor’s theory for suspensions of force-free bodies .
The hydrodynamics of swimming microorganisms
These couplings determine the properties of atoms, cells, planets and the universe as a whole, so it’s remarkable how little we know about them—we have no ’theory of constants’.
Three tests of LambdaCDM
Red cells are a physical system in which such a non perturbative theory could be applied.
The role of tank-treading motions in the transverse migration of a spheroidal vesicle in a shear flow