Dissipative structures and morphogenetic pattern in uhicellular algae.

  • 2.49 MB
  • 7658 Downloads
  • English
by
Royal Society , London
SeriesPhilosophical Transactions of the Royal Society of London -- Vol. 294, no. 1074, 16 September 1981, pp547-588
ContributionsRoyal Society.
ID Numbers
Open LibraryOL13808236M

Patterns of cell wall growth and ornamentation in unicellular algae, mainly in desmids, are compared with patterns generated by Tyson's Brusselator, a two-morphogen reaction-diffusion model. The model generates hexagonal arrays of points in two dimensions, according well with the observed patterns of surface ornamentation on desmid by: Patterns of cell wall growth and ornamentation in unicellular algae, mainly in desmids, are compared with patterns generated by Tyson’s Brusselator, a two-morphogen reaction-diffusion model.

Description Dissipative structures and morphogenetic pattern in uhicellular algae. EPUB

The mo. Patterns of cell wall growth and ornamentation in unicellular algae, mainly in desmids, are compared with patterns generated by Tyson's Brusselator, a two-morphogen reaction-diffusion model. The model generates hexagonal arrays of points in two dimensions, according well with the observed patterns of surface ornamentation on desmid zygospores.

Patterns of cell wall growth and ornamentation in unicellular algae, mainly in desmids, are compared with patterns generated by Tyson's Brusselator, a two-morphogen reaction-diffusion model.

The Dasycladalian algae produce diverse whorled structures, among which the best-known are the reproductive whorl (cap) and the vegetative whorls (hair whorls) of Acetabularia acetabulum.

The origin of these structures is addressed in terms of three pattern forming mechanisms proposed to explain whorl formation. The mechanisms involve either: mechanical buckling of the cell wall, reaction Cited by: 1.

Reaction-diffusion systems have often been invoked as a mechanism for the generation of chemical gradients which initiate pattern formation in embryos. We describe how, with the aid of path-following methods and the pseudo-spectral method, the space of steady-state solutions of the equations can be systematically mapped by: 6.

The pattern of wall deposition in sucrose was compared in control cells and in cells also treated with A After 1/ hr in an isotonic solution, the cells were plasmolyzed in At sucrose to reveal more clearly the wall deposition by:   The number of cotyledons in angiosperm monocots and dicots is tightly constrained.

But in the gymnosperm Pinaceae (pine family), which includes many of the conifers, cotyledon number (n c) can vary widely, commonly from 2 to Conifer cotyledons form in Cited by: 2.

Unicellular algae occur most frequently in water, especially in lankton is the population of free‐floating microorganisms composed primarily of unicellular algae.

In addition, algae may occur in moist soil or on the surface of moist rocks and wood. Algae live with fungi in lichens. According to the Whittaker scheme, algae are classified in seven divisions, of which five are. Dissipative structures and morphogenetic pattern in unicellular algae, ().

A class of reaction-di®usion mechanisms which preferentially select striped patterns, Reaction di®usion modelling of biological pattern formation: application to the embryogenesis of Drosophila melanogaster,Cited by: Algae lack the distinct cells and organs that characterize land plants.

Algae range in size from microscopic organisms, such as plankton that drift passively near the surfaces of oceans and freshwater bodies, to macroscopic seaweeds several meters long. The structural body of algae, either unicellular or multicellular, is called the thallus. Mechanisms acting in pattern morphogenesis in the cell walls of two distant groups of plants, pollen of spermatophytes and diatoms, are compared in order to discriminate common principles from plant group- and wall material-specific by: Dissipative structures in nature and human systems E.

Tiezzi1, R. Pulselli2, N. Marchettini2 & E. Tiezzi2 1Department of Mathematics and Informatics, University of Siena, Italy 2Department of Chemical and Biosystems Sciences, University of Siena, Italy Abstract Evolutionary physics studies the general behaviour of non equilibrium systems.

Journals & Books; Help Download PDF Recent examples of biological pattern formation where a pattern changes qualitatively as the underlying domain grows have given rise to renewed interest in the reaction–diffusion (Turing) model for pattern formation. T.C.

LacalliDissipative structures and morphogenetic pattern in unicellular algae Cited by: Essay on the Structure of Algae. The plant body in algae is always a thallus. It is not differentiated in root, stem and leaves.

Algae range in size from minute unicellular plants (less than 1 µ in diameter in some planktons) to very large highly differentiated multicellular forms e.g., some sea-weeds. Lacalli, T.C., Controlling reaction-diffusion pattern with gradients: lessons from Drosophila, and trajectories through parameter space.

In: Experimental and Theoretical Advances in Biological. Spatially Quantitative Control of the Number of Cotyledons in a Clonal Population of Somatic Embryos of Hybrid Larch Larix for application of Bessel functions to morphogenetic patterns in unicellular algae, see Lacalli ().] These are essentially products (in the Dissipative structures and morphogenetic pattern in unicellular algae.

Cited by:   There are two types of very large unicellular algae that together display pattern changes relevant to some of the most important features of multicellular plant development. First, the Dasycladales, an order of marine algae that have been described as ‘the most improbable unicellular organisms that exist’ (see Berger and Kaever,for Cited by: On the structure and origin of the seedling of Psittacanthus schiedeanus (Loranthaceae).

Canadian Journal of Botany – LacalliTC Dissipative structures and morphogenetic pattern in unicellular algae. Philosophical Transactions of the Royal Society, London B – LehmanA, Black R, Ecker JRCited by: This is how the long unicellular Dasycladales gain enough stability to grow upright.

When a calcified alga dies the coating may be preserved in the sediment as an impression of a once-living structure. Consequently, fossils of these coated algae exist, sometimes in great.

Genetic Structure of the Bithorax Complex Ernest0 Sanchez- Herrero, Jordi Casanova and Gin& Morata Introduction Research in developmental genetics of Drosophila has recently concentrated on the study of a set of genes which control developmental decisions.

The Structure and Reproduction of the Algae, Volume 1 The Structure and Reproduction of the Algae, Felix Eugene Fritsch: Author: Felix Eugene Fritsch: Publisher [Cambridge] University Press, Original from: the University of Michigan: Digitized: Length: pages: Export Citation: BiBTeX EndNote RefMan.

An exhaustive review on all things algae would require a multi-volume encyclopedic work. Even then, such a tome would prove to be of limited value, as in addition to being quite complex, it would soon be outdated, as the field of phycology is full of continual revelations and new : Anatomy, Biochemistry, and Biotechnology o5/5(2).

CONTENTS Series B Volume No. 14 August Metabolic and physiological consequences of trace element deficiency in animals and man A Discussion organized by L. FOWDEN, F.R.S., G. GARTON, F.R.S., and C. THE CLASSIFICATION OF THE ALGAE. A REVIEW OF PROFESSOR OLTHANNS' RECENT BOOK.' AFTER the large amount of work of all kinds that has been published on the Algae, more particularly on the green forms and on the plant-like Flagellata, during the last fifteen years, a putting together of the results in one or more general works has.

Ectocarpus siliculosus is a small brown alga that has recently been developed as a genetic model. Its thallus is filamentous, initially organized as a main primary filament composed of elongated cells and round cells, from which branches differentiate.

Modeling of its early development suggests the involvement of very local positional information mediated by cell-cell recognition.

Lacalli TC. Dissipative structures and morphogenetic pattern in unicellular algae. Philosophical Transactions of the Royal Society of London B.

; – Lacalli TC, Harrison LG. Turing's conditions and the analysis of morphogenetic models. Journal of Theoretical Biology. ; – Lacalli TC, Harrison by: Morphogenesis remains a riddle, wrapped in a mystery, inside an enigma.

Download Dissipative structures and morphogenetic pattern in uhicellular algae. PDF

It remains a formidable problem viewed from many different perspectives of morphology, genetics, and computational modelling. We propose a biochemical reductionist approach that shows how both internal and external physical forces contribute to plant morphogenesis via mechanical stress–strain transduction from the Cited by: 4.

Brown algae are multicellular marine organisms evolutionarily distant from both metazoans and land plants. The molecular or cellular mechanisms that govern the developmental patterning in brown algae are poorly characterized.

Here, we report the first morphogenetic mutant, étoile (etl), produced in the brown algal model Ectocarpus siliculosus. Genetic, cellular, and Cited by: The Structure and Reproduction of the Algae.

by F. Fritsch (Author) out of 5 stars 1 rating. See all 3 formats and editions Hide other formats and editions.

Price 5/5(1). Describe the Morphology (cell wall structure, pigments) of BROWN ALGAE.

Details Dissipative structures and morphogenetic pattern in uhicellular algae. PDF

It is a multicellular body called a thallus, which is relatively undifferentiated. Its cell wall is made of cellulose with some plasmodesmatal connection.Give an example of each of the following types of green algae: unicellular green algae.

chlymydomonas. Give an example of each of the following types of green algae: filamentous green algae. Regarding Dinoflagellates: describe their structure. 2 flagella and cellulose plate, chloroplast vary from yellow-green to brown. Regarding.on complex shapes with a remarkable degree of intracellular patterning.

How do these patterns arise? As in embryogenesis, the development of structure inside a cell can be broken down into a number of basic pro-cesses.

For each part of the cell, morphogenetic processes create internal structures such as .