CyberRaiders Math

Intelligence crisis

akourakine — Mon, 04 Feb 2008 10:59:19 -0800

Introduction to the scale-invariant organizational phenomenon termed "intelligence crisis".

CyberRaiders Math

A semaphorin code defines subpopulations of spinal motor neurons during mouse development.

apryl — Sun, 02 Dec 2007 19:36:08 -0800

In the spinal cord, motor neurons (MNs) with similar muscle targets and sensory inputs are grouped together into motor pools. To date, relatively little is known about the molecular mechanisms that control the establishment of pool-specific circuitry. Semaphorins, a large family of secreted and cell surface proteins, are important mediators of developmental processes such as axon guidance and cell migration. Here, we used mRNA in situ hybridization to study the expression patterns of semaphorins and their receptors, neuropilins and plexins, in the embryonic mouse spinal cord.

CyberRaiders Math

Simultaneity Video

nsf — Fri, 05 Oct 2007 15:03:52 -0700

The very notion of "now" is relative. For more information, see the World Year of Physics 2005 feature.

CyberRaiders Math

Time Dilation Video

nsf — Thu, 04 Oct 2007 12:56:43 -0700

Is time different to observers moving at different speeds? For more information, see the World Year of Physics 2005 feature.

CyberRaiders Math

Protein Synthesis

jmath — Tue, 18 Sep 2007 15:47:54 -0700

Directed in 1971 by Robert Alan Weiss for the Department of Chemistry of Stanford University and imprinted with the "free love" aura of the period, this short film continues to be shown in biology class today. It has since spawn a series of similar funny attempts at vulgarizing protein synthesis. Narrated by Paul Berg, 1980 Nobel prize for Chemistry.

CyberRaiders Tech

Time Dilation - An Experiment With Mu-Mesons

scivee-team — Fri, 14 Sep 2007 17:04:01 -0700

TIME DILATION: an experiment with mu-mesons

This classic film documents an experiment done in 1963 the results of which can only be explained when one accepts the consequence that moving clocks run slow. This phenomenon is known as time dilation. The timekeeping device is the mu-mesona, a subatomic particle with origins away from the Earth moving at relativistic speed. What follows here is an explanation of the experiment described in that film.

Science History

Order in Spontaneous Behavior

brembs — Wed, 22 Aug 2007 06:07:09 -0700

Brains are usually described as input/output systems: they transform sensory input into motor output. However, the motor output of brains (behavior) is notoriously variable, even under identical sensory conditions. The question of whether this behavioral variability merely reflects residual deviations due to extrinsic random noise in such otherwise deterministic systems or an intrinsic, adaptive indeterminacy trait is central for the basic understanding of brain function.

CyberRaiders Math