Playing catch-up

Playing Catch-up with Iterated Exponentials

Suppose that we have two animals that make the same number of strides per minute, but one of them makes larger strides than the other. If the strides of the smaller animal (the prey) have length a, and those of the larger animal (the predator) have length b, it is easy to see that a persistent predator will always be able to catch up with its prey. Let us assume that the prey starts one step ah...

Transcriptional Regulation of Grass Secondary Cell Wall Biosynthesis: Playing Catch-Up with Arabidopsis thaliana

Secondary cell wall synthesis occurs in specialized cell types following completion of cell enlargement. By virtue of mechanical strength provided by a wall thickened with cellulose, hemicelluloses, and lignin, these cells can function as water-conducting vessels and provide structural support. Several transcription factor families regulate genes encoding wall synthesis enzymes. Certain NAC and...

Statistics catch-up lecture

Example 1. In a genetic study, n = 2217 patients are recruited, among which 1127 have bladder cancer. After whole genome sequencing, p = 475290 single nucleatide polymorphisms (or SNPs, a possible variation of the DNA sequence at one location) are measured on each patient. We construct a matrix X = (Xij)1≤i≤n,1≤j≤p where Xij = 1 if the ith patient has a mutation at jth location and 0 otherwise....

Catch-up Growth

Catch-up growth.

Catch-up growth, defined as growth velocity above the statistical limits of normality for age or maturity during a defined period of time, is distinguished from compensatory growth since it makes up for a potential loss rather than an actual loss and is seen in the whole body as opposed to specific organs. The cellular explanation for catch-up based on the work of Winick is described and a rece...