Statistical Analysis of Protein Structural Features: Relationships and PCA Grouping

2015 ◽  
pp. 33-43
Author(s):  
E. Del Prete ◽  
S. Dotolo ◽  
A. Marabotti ◽  
A. Facchiano
Keyword(s):  
Statistical Analysis ◽  
Structural Features

scholarly journals Singular Structural Features on Humic Fractions in Solution: Statistical Analysis of Diverse Analytical Techniques Spectra

2010 ◽  
Vol 74 (1) ◽  
pp. 74-86 ◽  
Author(s):  
Roberto Baigorri ◽  
Marta Fuentes ◽  
Francisco J. González-Vila ◽  
José M. García-Mina
Keyword(s):  
Statistical Analysis ◽  
Analytical Techniques ◽  
Structural Features ◽  
Humic Fractions

THE STUDY NOISE OF THE PULSE ENERGY OF THE IBR-2M REACTOR

2019 ◽  
pp. 48-54
Author(s):  
A.M. Abackumov ◽  
L.A. Tayibov ◽  
T. Tsogsaihan
Keyword(s):  
Statistical Analysis ◽  
Standard Deviation ◽  
Pulse Energy ◽  
Structural Features ◽  
The Creation

This work is devoted to investigation of fluctuations of pulse energy of the IBR-2M reactor by the method of statistical analysis. There is a description of structural features of the IBR-2M reactor in this work and its main parameters are given. The principle of the creation of neutron pulses is shown. The work also contains a description of the method of statistical analysis and further calculations made by this method. Having the received data, a comparison of the estimates of the standard deviation with the available results for 2012 was made.

scholarly journals Contribución del Análisis Estadístico Textual a la labor del tutor académico y el orientador educativo

2010 ◽  
pp. 110-130
Author(s):  
Mtra. Ma. De los Ágneles Silva Mar ◽  
Dra. María Luisa Hernández Maldonado ◽  
Lic. Areli Sosa Mora
Keyword(s):  
Data Analysis ◽  
Statistical Analysis ◽  
School Performance ◽  
Correspondence Analysis ◽  
Structural Features ◽  
Community Study ◽  
Multidimensional Data ◽  
Student Community ◽  
Open Questions ◽  
Self Knowledge

Este trabajo es parte del resultado del análisis textual realizado a las respuestas libres contenidas en la encuesta sobre “Búsqueda de la personalidad de los estudiantes” que la Universidad Veracruzana aplicó a parte de su comunidad estudiantil. Entre los objetivos que se plantean se encuentra el estudio sobre el autoconocimiento que los estudiantes manifiestan tener. Este trabajo contribuye a la labor del Tutor Académico y al quehacer del Orientador Educativo que, entre otras, tienen como finalidad el reforzar y apoyar a los estudiantes en sus requerimientos para mejorar su rendimiento escolar. Para el tratamiento de este instrumento, cuyas variables son de naturaleza textual, se ha realizado un análisis estadístico de textos. Este análisis ha integrado distintas técnicas y métodos (combina el análisis multidimensional de datos y la lexicometría) que facilitan la tarea en el análisis de encuestas que contienen preguntas de respuesta libre. En una primea etapa, se aplican procedimientos que permiten obtener el número de ocurrencias de las unidades verbales básicas (generalmente palabras); posteriormente, a partir de esos recuentos es posible realizar un análisis factorial de correspondencias que muestre los rasgos estructurales que los individuos manifiestan a través de sus respuestas.AbstractThis work is part of the result of textual analysis made to the free responses contained in the survey on "Finding the personality of students" that the Universidad Veracruzana applied to part of their student community. Study about self-knowledge, that students say they have, is one of the objectives studied. This work contributes to the work of Tutor Academic and Educational counsellor’s task that, among others, are aimed at strengthening and supporting students in their requirements to improve school performance. Treatment of this tool -whose variables are textual nature-, consists in a statistical analysis of texts. This analysis has integrated various techniques and methods (combining multidimensional data analysis and lexicometry) facilitating the analysis of survey with open questions. The first step is to apply procedures that obtain the number of occurrences of basic verbal units (usually words); then, from these counts, it is possible to perform a correspondence analysis that shows the structural features that individuals manifest through their responses.Recibido: 11 de enero de 2010 Aceptado: 30 de marzo de 2010

Statistical analysis of classification

1966 ◽  
Vol 24 ◽  
pp. 188-189
Author(s):  
T. J. Deeming
Keyword(s):  
Multivariate Analysis ◽  
Statistical Analysis ◽  
Classification Scheme ◽  
Analytical Procedure ◽  
Narrow Band ◽  
Scientific Research ◽  
Maximum Amount ◽  
Amount Of Information

If we make a set of measurements, such as narrow-band or multicolour photo-electric measurements, which are designed to improve a scheme of classification, and in particular if they are designed to extend the number of dimensions of classification, i.e. the number of classification parameters, then some important problems of analytical procedure arise. First, it is important not to reproduce the errors of the classification scheme which we are trying to improve. Second, when trying to extend the number of dimensions of classification we have little or nothing with which to test the validity of the new parameters.Problems similar to these have occurred in other areas of scientific research (notably psychology and education) and the branch of Statistics called Multivariate Analysis has been developed to deal with them. The techniques of this subject are largely unknown to astronomers, but, if carefully applied, they should at the very least ensure that the astronomer gets the maximum amount of information out of his data and does not waste his time looking for information which is not there. More optimistically, these techniques are potentially capable of indicating the number of classification parameters necessary and giving specific formulas for computing them, as well as pinpointing those particular measurements which are most crucial for determining the classification parameters.

Electron microscopy and diffraction studies of polyimides

1983 ◽  
Vol 41 ◽  
pp. 28-29
Author(s):  
O.C. de Hodgins ◽  
K. R. Lawless ◽  
R. Anderson
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Structural Features ◽  
Inert Atmosphere ◽  
Polyimide Films ◽  
Resolution Electron ◽  
The Matrix ◽  
High Resolution Electron Microscope ◽  
Diffraction Patterns ◽  
Polymeric Samples

Commercial polyimide films have shown to be homogeneous on a scale of 5 to 200 nm. The observation of Skybond (SKB) 705 and PI5878 was carried out by using a Philips 400, 120 KeV STEM. The objective was to elucidate the structural features of the polymeric samples. The specimens were spun and cured at stepped temperatures in an inert atmosphere and cooled slowly for eight hours. TEM micrographs showed heterogeneities (or nodular structures) generally on a scale of 100 nm for PI5878 and approximately 40 nm for SKB 705, present in large volume fractions of both specimens. See Figures 1 and 2. It is possible that the nodulus observed may be associated with surface effects and the structure of the polymers be regarded as random amorphous arrays. Diffraction patterns of the matrix and the nodular areas showed different amorphous ring patterns in both materials. The specimens were viewed in both bright and dark fields using a high resolution electron microscope which provided magnifications of 100,000X or more on the photographic plates if desired.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

Study of the Molecular Architecture of Keratin Filaments by Electron Microscopy

1982 ◽  
Vol 40 ◽  
pp. 118-119
Author(s):  
U. Aebi ◽  
P. Rew ◽  
T.-T. Sun
Keyword(s):  
Electron Microscopy ◽  
Structural Organization ◽  
Cell Types ◽  
Structural Features ◽  
Molecular Architecture ◽  
The Past ◽  
Keratin Filaments ◽  
Different Types ◽  
10 Nm Filaments ◽  
Different Cell Types

Various types of intermediate-sized (10-nm) filaments have been found and described in many different cell types during the past few years. Despite the differences in the chemical composition among the different types of filaments, they all yield common structural features: they are usually up to several microns long and have a diameter of 7 to 10 nm; there is evidence that they are made of several 2 to 3.5 nm wide protofilaments which are helically wound around each other; the secondary structure of the polypeptides constituting the filaments is rich in ∞-helix. However a detailed description of their structural organization is lacking to date.

Measurement and Reduction of Radiation Damage in Frozen Hydrated Crystalline Specimens

1978 ◽  
Vol 36 (3) ◽  
pp. 70-77 ◽  
Author(s):  
R.M. Glaeser ◽  
S.B. Hayward
Keyword(s):  
Diffraction Pattern ◽  
Structural Information ◽  
Structural Disorder ◽  
Structural Features ◽  
Biological Macromolecules ◽  
Diffraction Intensity ◽  
Object Structure ◽  
Specimen Material ◽  
Unit Cells ◽  
Identical Unit

Highly ordered or crystalline biological macromolecules become severely damaged and structurally disordered after a brief electron exposure. Evidence that damage and structural disorder are occurring is clearly given by the fading and eventual disappearance of the specimen's electron diffraction pattern. The fading and disappearance of sharp diffraction spots implies a corresponding disappearance of periodic structural features in the specimen. By the same token, there is a oneto- one correspondence between the disappearance of the crystalline diffraction pattern and the disappearance of reproducible structural information that can be observed in the images of identical unit cells of the object structure. The electron exposures that result in a significant decrease in the diffraction intensity will depend somewhat upon the resolution (Bragg spacing) involved, and can vary considerably with the chemical makeup and composition of the specimen material.

Some Structural Features of Metaphase Chromosomes of Mice and Men

1967 ◽  
Vol 25 ◽  
pp. 190-191
Author(s):  
Godfrey C. Hoskins ◽  
Betty B. Hoskins
Keyword(s):  
Electron Microscopy ◽  
Electron Micrographs ◽  
Structural Features ◽  
Metaphase Chromosomes ◽  
The Future ◽  
Of Mice And Men ◽  
Mouse Cells ◽  
Human And Mouse

Metaphase chromosomes from human and mouse cells in vitro are isolated by micrurgy, fixed, and placed on grids for electron microscopy. Interpretations of electron micrographs by current methods indicate the following structural features.Chromosomal spindle fibrils about 200Å thick form fascicles about 600Å thick, wrapped by dense spiraling fibrils (DSF) less than 100Å thick as they near the kinomere. Such a fascicle joins the future daughter kinomere of each metaphase chromatid with those of adjacent non-homologous chromatids to either side. Thus, four fascicles (SF, 1-4) attach to each metaphase kinomere (K). It is thought that fascicles extend from the kinomere poleward, fray out to let chromosomal fibrils act as traction fibrils against polar fibrils, then regroup to join the adjacent kinomere.

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