object

Red Queen

...tion of a chess piece. She has become a popular object of metaphor as a result of the dream-like scene in which she seizes Alice by the shoulder in order that they can run together very fast in a desperate attempt to keep up with the landscape. She then advises Alice that in order to get anywhere else...

Potential energy

... stored as a result of the elevated position of an object such as a rock on top of a hill or water behind a ...ells)] A frequently adopted convention is that an object infinitely far away from an attracting source has zero potential energy. Relative to this, an objec...

Pigment

... there is no such thing as white pigment. A white object is simply a diffuse reflecting object which does not contain any pigment. In the coloring of paint , ink , plastic , fabric and othe...

Magnetic resonance imaging

...es of excited hydrogen nuclei in water. When the object to be imaged is placed in a powerful, uniform mag...ighting in two or three dimensions of a real space object as sampled by MRI. The information is subsequently inverse Fourier transformed by a computer int...

Microscope

...more lenses that produce an enlarged image of an object placed in the focal plane of the lens(es). See ...es coarse adjustment knob fine adjustment knob object holder or stage mirror diaphragm and condenser Common optical microscope and its pri...

Kinetic energy

...tivity theory states that the kinetic energy of an object grows towards infinity as its velocity approaches ...t, and thus that it is impossible to accelerate an object to this boundary. Where gravity is weak, and objects move at much slower velocities than light (e.g...

Human

... and Silk 2003:389-399). Some religious groups object to the theory of evolution : see creationism , argument from evolution , intelligent design , creation (theology) . Culture Culture is defined here as a set of distinctive material, intellectual , emotional , and spiritual features of ...

Gregor Mendel

...ogy. His experimental results have later been the object of considerable dispute. The renowned statistician Ronald Fisher analyzed the results of the F1 ratio and found them to be implausibly close to the exact ratio of 3 to 1. Only a few would accuse Mendel of scientific malpractice or call it a scien...

Eye

...refraction required depends on the distance of the object which is being viewed. A distant object will require less bending of light than a nearer one. Most of the refraction occurs at the cornea ...

Epigenetics

...ing (see Waterland citation). In both cases, the object of study includes how gene regulatory information that is not expressed in DNA sequences is transmitted from one generation (of cells or organisms) to the next - that is (harking back to the Greek prefix), 'in addition to' the genetic information enc...

Enzyme

...al reactions. This is analogous to raising a heavy object by attaching it to a rope that goes over a pulley ...a large release of energy. This is analogous to an object sliding freely on a flat surface; the object may be pulled in one direction by attaching it to a rop...

Computed axial tomography

... three-dimensional image of the internals of an object from a large series of two-dimensional X-ray ima...ce. Many data scans are progressively taken as the object is gradually passed through the gantry. Newer machines with faster computer systems and newer softw...

Anatomy

...a scientific and fascinating study, having for its object the discovery of the causes which have brought about the existing structure of humans, and needing a knowledge of the allied sciences of embryology or developmental biology , phylogeny , and histology . Pathological anatomy (or morbid a...

Affinity chromatography

...cess can be illustrated thus: Of course if the object is to remove an undesirable molecule from the initial mixture, then once the initial binding has been achieved, the material of interest is the unbound mixture, and the washing and elution steps can be omitted or used simply for analytical purposes. ...