Models for Embryonic Periodicity

ISBN-10: 3805560087

ISBN-13: 9783805560085

Edition: 3rd

Authors: L. I. Held, H. W. Sauer

List price: $35.00
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Spatially periodic patterns like zebra stripes or insect segments are mysteriously precise. How do they form during development? The deeper question, which lies at the heart of developmental biology, is: How do cells in different places within an embryo acquire different states of gene expression? In principle, there are three possible answers: either a cell's position causes its state, or its state causes its position, or both are caused by some third agent. These alternatives provide a framework for classifying theoretical models. Positional information models, the most widely used today, belong to the first category. Dozens of rival schemes have been proposed, but until now many have been overlooked because they were obscured by confusing jargon, impenetrable mathematics, or tortuous logic.In order to facilitate comparisons, this book (1) strips away all ad hoc assumptions to expose the central tenets of each model, (2) traces the historical roots and familial relationships among different types of models, and (3) illustrates the rules of each model in terms of how it would solve the same basic problem. It also reexamines the computer metaphor in developmental biology: Are embryonic cells robots in disguise? The surprising answer, based upon their ability to perform Boolean logic, store and process information, execute iterative subroutines ... and malfunction in predictable ways ... is yes!This valuable text by the author of the acclaimed new book Imaginal Discs (Cambridge University Press) is required reading for biologists and zoologists interested in the pattern subfield of developmental biology.
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Book details

List price: $35.00
Edition: 3rd
Publisher: S. Karger AG
Publication date: 6/30/1998
Binding: Paperback
Pages: 120
Size: 6.00" wide x 8.75" long x 0.50" tall
Weight: 0.484
Language: English

Types of Patterning Mechanisms
Positional Information Mechanisms
The Gradient Model
The Polar Coordinate Model
The Progress Zone Model
Puzzles and Paradoxes
Prepattern Mechanisms
Models Involving Physical Forces
Reaction-Diffusion Models
Induction Across Layers
Prepatterns vs. Positional Information
Hybrid Models
Determination Wave Mechanisms
Chemical Waves
Cellular Automata
The Sequential Induction Model
The Clock-and-Wavefront Model
Inhibitory Field Models
Darwinian Mechanisms
Cell Death Models
State-Change Models
Rearrangement Mechanisms
Adhesion Models
Repulsion Models
Interdigitation Models
Chemotaxis Models
Cell-Lineage Mechanisms
The Quantal Mitosis Model
The Stem Cell Model
L-Systems and Fractal Geometry
The Cortical Inheritance Model
The Computer Metaphor in Developmental Biology
Local vs. Global Information
Binary Codes and Boolean Logic
Default States
Linguistic Hierarchies
Stent's Cat, Brenner's Virus, and the 'Homeobox Homunculi'
Subroutines and Modules
Iteration and Halt Conditions
Input-Output, 'Morphospaces', and Evolutionary Constraints
Game Theory
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