J

Jarvis-Patrick cluster algorithm

A non-heirarchial clustering method for conformational analysis of molecules that uses a "nearest neighbor" approach to look for clusters of conformations that are the shortest distance away from each other.

Java

A programming language developed by Sun Microsystems that allows small programs (applets) to be run on any computer. Java applets are typically involved when a user clicks on a hyperlink on a Web page.

Jini

Java for small appliances.

joule

Standard unit of energy in the meter-kilogram system. One joule is the energy delivered in one second by a one-watt power source. Approximately equal to 0.24 calories.

jumping genes

transposons

junctional diversification

The random loss and gain of nucleotides at immunoglobin V(D)J joining sites. It increases the diversity of V- region coding sequences created by recombination.

jun oncogene

produces the Jun protein, a transcriptional regulator (with a leucine zipper motif) that recognizes AP-1 sites in DNA. Similar function to fos.

junk DNA

The fraction of genomic DNA that is devoid of function.