Morphogenesis of the spikelets and inflorescence of Andropogon gerardii Vit. (Gramineae) and the relationship between form, information theory, and thermodynamics

1982 ◽  
Vol 60 (6) ◽  
pp. 806-817 ◽  
Author(s):  
Jack Maze ◽  
R. K. Scagel
Keyword(s):  
Information Theory ◽  
Cell Division ◽  
Andropogon Gerardii ◽  
Informational Entropy ◽  
Inflorescence Axis ◽  
Sessile Spikelet ◽  
Growth Differences ◽  
The Relationship ◽  
Marginal Meristem ◽  
Form Information

The spikelets of Andropogon gerardii occur in pairs, one sessile and one pedicellate. The first glume of the sessile spikelet is bikeeled. The fertile lemma of the sessile spikelet is awned and the awn develops after the lemma has been initiated. The paleas of both spikelets initiate at two positions, are bikeeled, and, on occasion, are two-parted as a result of an interrupted zone of initiation. Each functional lodicule of A. gerardii is developmentally similar to one keel of the palea that has become thickened as a result of activity of an adaxial meristem. The spikelet pairs develop from one primordium. At early stages, spikelet pair primordia about each other along the inflorescence axis and the spikelets of a pair are not separated by a pedicel. The pedicel and the axis of the inflorescence develop through intercalary growth. Differences between appendages in the spikelet of A. gerardii can be viewed as the result of differing amounts of developmental activity (apical growth, marginal meristem, adaxial meristem) common to phyllomic structures. These common developmental activities are, in turn, the result of certain patterns of cell division and cell growth. The evolution of form thus results from alteration of common developmental events. When viewed in such a manner, the evolution of form is seen to be the modification of the informational entropy in an organism. With evolution, there are increases and decreases in informational entropy but, generally speaking, more complex organisms have higher entropy.

PIOPLE. INFORMATION. DEGRADATION

2019 ◽  
pp. 44-53
Author(s):  
Andrey Varlamov ◽  
Vladimir Rimshin
Keyword(s):  
Information Theory ◽  
Mathematical Theory ◽  
Maximum Information ◽  
Building Models ◽  
Man And Nature ◽  
History Of ◽  
Nature And Society ◽  
Relationship Of ◽  
Link Information ◽  
The Relationship

Considered the issues of interaction between man and nature. Noted that this interaction is fundamental in the existence of modern civilization. The question of possible impact on nature and society with the aim of preserving the existence of human civilization. It is shown that the study of this issue goes towards the crea-tion of models of interaction between nature and man. Determining when building models is information about the interaction of man and nature. Considered information theory from the viewpoint of interaction between nature and man. Noted that currently information theory developed mainly as a mathematical theory. The issues of interaction of man and nature, the availability and existence of information in the material sys-tem is not studied. Indicates the link information with the energy terms control large flows of energy. For con-sideration of the interaction of man and nature proposed to use the theory of degradation. Graphs are pre-sented of the information in the history of human development. Reviewed charts of population growth. As a prediction it is proposed to use the simplest based on the theory of degradation. Consideration of the behav-ior of these dependencies led to the conclusion about the existence of communication energy and information as a feature of the degradation of energy. It justifies the existence of border life ( including humanity) at the point with maximum information. Shows the relationship of energy and time using potential energy.

scholarly journals Area Entropy and Quantized Mass of Black Holes from Information Theory

Entropy ◽  
2021 ◽  
Vol 23 (7) ◽  
pp. 858
Author(s):  
Dongshan He ◽  
Qingyu Cai
Keyword(s):  
Information Theory ◽  
Black Hole ◽  
Black Hole Entropy ◽  
Quantum Corrections ◽  
Compton Wavelength ◽  
Information Theoretic ◽  
Curved Space ◽  
Thermodynamic Entropy ◽  
Hole Area ◽  
The Relationship

In this paper, we present a derivation of the black hole area entropy with the relationship between entropy and information. The curved space of a black hole allows objects to be imaged in the same way as camera lenses. The maximal information that a black hole can gain is limited by both the Compton wavelength of the object and the diameter of the black hole. When an object falls into a black hole, its information disappears due to the no-hair theorem, and the entropy of the black hole increases correspondingly. The area entropy of a black hole can thus be obtained, which indicates that the Bekenstein–Hawking entropy is information entropy rather than thermodynamic entropy. The quantum corrections of black hole entropy are also obtained according to the limit of Compton wavelength of the captured particles, which makes the mass of a black hole naturally quantized. Our work provides an information-theoretic perspective for understanding the nature of black hole entropy.

scholarly journals Specimen-based analysis of morphology and the environment in ecologically dominant grasses: the power of the herbarium

2018 ◽  
Vol 374 (1763) ◽  
pp. 20170403 ◽  
Author(s):  
Christine A. McAllister ◽  
Michael R. McKain ◽  
Mao Li ◽  
Bess Bookout ◽  
Elizabeth A. Kellogg
Keyword(s):  
Morphological Characters ◽  
Automated Image Analysis ◽  
Climate Variables ◽  
Theme Issue ◽  
Analysis Techniques ◽  
Temperature And Precipitation ◽  
Sessile Spikelet ◽  
Effects Of Temperature ◽  
The Relationship ◽  
Image Analysis Techniques

Herbaria contain a cumulative sample of the world's flora, assembled by thousands of people over centuries. To capitalize on this resource, we conducted a specimen-based analysis of a major clade in the grass tribe Andropogoneae, including the dominant species of the world's grasslands in the genera Andropogon , Schizachyrium , Hyparrhenia and several others. We imaged 186 of the 250 named species of the clade, georeferenced the specimens and extracted climatic variables for each. Using semi- and fully automated image analysis techniques, we extracted spikelet morphological characters and correlated these with environmental variables. We generated chloroplast genome sequences to correct for phylogenetic covariance and here present a new phylogeny for 81 of the species. We confirm and extend earlier studies to show that Andropogon and Schizachyrium are not monophyletic. In addition, we find all morphological and ecological characters are homoplasious but variable among clades. For example, sessile spikelet length is positively correlated with awn length when all accessions are considered, but when separated by clade, the relationship is positive for three sub-clades and negative for three others. Climate variables showed no correlation with morphological variation in the spikelet pair; only very weak effects of temperature and precipitation were detected on macrohair density. This article is part of the theme issue ‘Biological collections for understanding biodiversity in the Anthropocene'.

scholarly journals The Relationship between Autopoiesis Theory and Biosemiotics: On Philosophical Suppositions as Bases for a New Information Theory

2011 ◽  
Vol 9 (2) ◽  
pp. 424-433
Author(s):  
Yohei Nishida
Keyword(s):  
Information Theory ◽  
Systems Theory ◽  
Unified Theory ◽  
Methodological Issues ◽  
Basic Principles ◽  
New Information ◽  
Theory Of Information ◽  
The Relationship

This paper discusses methodological issues related to a possible framework for a unified theory of information. We concentrate on the relationship between systems theory and semiotics, or to put it more concretely, the relationship between autopoiesis theory and biosemiotics. These theories give rise to two decisive viewpoints on life that seem poten- tially contradictory and consequently provoke a fruitful controversy, which is conducive for the consideration of philosophical suppositions vital for a new information theory. The following three points are derived in the context of basic principles: epistemology rather than ontology, constructivism rather than metaphysics, meta-theoretical recursiveness rather than linear consistency.

scholarly journals An orthographic effect in loanword adaptation

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Robert Daland ◽  
Mira Oh
Keyword(s):  
Information Theory ◽  
Speech Perception ◽  
Recent Work ◽  
Native Language ◽  
Relative Strength ◽  
Large Role ◽  
Loanword Adaptation ◽  
English Vowels ◽  
Source Form ◽  
The Relationship

Loanword corpora have been an important tool in studying the relationship between speech perception and native-language phonotactics. Recent work has challenged this use of loanword corpora on methodological grounds, based on the fact that source and possibly loan orthography conditions the adaptation. The present study replicates and extends this finding by using information theory to quantify the relative strength of orthographic effects, in the adaptation of English vowels into Korean. It is found that the orthographic effect is strong for unstressed vowels, but almost unnoticable for stressed vowels. It is proposed that orthography plays a large role in adaptation only when the source form is perceptually compatible with multiple phonological parses in the borrowing language.

The role of initial cells in maize anther morphogenesis

Development ◽  
1992 ◽  
Vol 116 (4) ◽  
pp. 1077-1085 ◽  
Author(s):  
R.K. Dawe ◽  
M. Freeling
Keyword(s):  
Cell Division ◽  
Small Groups ◽  
Cell Movement ◽  
Basic Structure ◽  
Early Growth ◽  
Structural Template ◽  
Axes Of Symmetry ◽  
The Relationship ◽  
Mature Anther

The near absence of cell movement in plants makes clonal analysis a particularly informative method for reconstructing the early events of organ formation. We traced the patterns of cell division during maize anther development by inducing sector boundaries that preceded the earliest events of anther initiation. In doing this, we were able to estimate the smallest number of cells that are fated to form an anther, characteristic cell division patterns that occur during anther morphogenesis, and the relationship between the pre-existing symmetry of the initial cells and the final symmetry of the mature anther. Four general conclusions are made: (1) anthers are initiated from small groups of 12 or fewer cells in each of two floral meristematic layers; (2) the early growth of the anther is more like a shoot than a glume or leaf; (3) cell ancestry does not dictate basic structure and (4) the orientation of initial cells predicts the orientation of the four pollen-containing microsporangia, which define the axes of symmetry on the mature anther. The final point is discussed with other data, and an explanation involving a ‘structural template’ is invoked. The idea is that the orientation of initial cells within the floral meristem establishes an architectural pattern into which anther cells are recruited without regard to their cellular lineages. The structural template hypothesis may prove to be generally applicable to problems of pattern formation in plants.

DNA methylation versus gene expression

Development ◽  
1984 ◽  
Vol 83 (Supplement) ◽  
pp. 31-40
Author(s):  
Adrian P. Bird
Keyword(s):  
Gene Expression ◽  
Dna Methylation ◽  
Cell Division ◽  
Methylation Pattern ◽  
Current Evidence ◽  
Evolutionary Perspective ◽  
Cell Type ◽  
Versus Gene ◽  
Daughter Cells ◽  
The Relationship

Vertebrate DNA is methylated at a high proportion of cytosine residues in the sequence CpG, and it has been suggested that the distribution of methylated and non-methylated CpGs in a given cell type influences the pattern of gene expression in those cells. Since a DNA methylation pattern is normally transmitted faithfully to daughter cells via cell division, this idea suggests an origin for stable, clonally inherited patterns of gene expression. This article discusses some of the current evidence for a relationship between DNA methylation and gene expression. Although the evidence is incomplete, it appears already that the relationship is variable: transcription of some genes is repressed by the presence of 5-methylcytosine at certain CpGs, and may be controlled by methylation, while transcription of other genes is indifferent to methylation. In attempting to explain this variability it is helpful to adopt an evolutionary perspective.

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