Extinction-angle distribution of plagioclase feldspars in clastic sediments

1975 ◽  
Vol 7 (4) ◽  
pp. 335-348 ◽  
Author(s):  
S. Mizutani
Keyword(s):  
Angle Distribution ◽  
Extinction Angle ◽  
Clastic Sediments

Sequence Specific Dihedral Angle Distribution: Application in Protein Structure Prediction and Evaluation

1970 ◽  
Vol 19 (2) ◽  
pp. 217-226
Author(s):  
S. M. Minhaz Ud-Dean ◽  
Mahdi Muhammad Moosa
Keyword(s):  
Protein Structure ◽  
Dihedral Angle ◽  
Protein Structure Prediction ◽  
Structure Prediction ◽  
Protein Structures ◽  
Angle Distribution ◽  
Ramachandran Plot ◽  
Specific Data ◽  
Specific Distribution ◽  
Structure Evaluation

Protein structure prediction and evaluation is one of the major fields of computational biology. Estimation of dihedral angle can provide information about the acceptability of both theoretically predicted and experimentally determined structures. Here we report on the sequence specific dihedral angle distribution of high resolution protein structures available in PDB and have developed Sasichandran, a tool for sequence specific dihedral angle prediction and structure evaluation. This tool will allow evaluation of a protein structure in pdb format from the sequence specific distribution of Ramachandran angles. Additionally, it will allow retrieval of the most probable Ramachandran angles for a given sequence along with the sequence specific data. Key words: Torsion angle, φ-ψ distribution, sequence specific ramachandran plot, Ramasekharan, protein structure appraisal D.O.I. 10.3329/ptcb.v19i2.5439 Plant Tissue Cult. & Biotech. 19(2): 217-226, 2009 (December)

Cyclic and sequence-stratigraphic characteristics of the Vize-Serpukov deposits of the southern part of Moscow syncline

2018 ◽  
pp. 30-41
Author(s):  
R . R . Gabdullin ◽  
А. V. Bershov ◽  
Е. N. Samarin ◽  
N. V. Badulina ◽  
М. А. Afonin ◽  
...  
Keyword(s):  
Generalized Model ◽  
Sequence Stratigraphic ◽  
Biogenic Carbonate ◽  
Clastic Sediments

Composition and origin of Visean–Serpukhovian deposits of the Southern part of the Moscow syncline based upon generalizations of our own results and analysis of published and unpublished data were specified. The levels of karst-influenced rocks correspond to the shallowest biogenic carbonate organogeneous-clastic sediments of the initial and final phases of the eustatic cycle, i.e. the beginning of the transgression (the transgressive system of the tracts) and the end of the regression (the second half of the high-standing tract). In the karst cavities alluvial sands of the Oka river were found. A generalized model of the sequence was proposed and a sequential-stratigraphic interpretation of the studied section was carried out.

scholarly journals Electromagnetic ELF wave intensification associated with fast earthward flows in mid-tail plasma sheet

2012 ◽  
Vol 30 (3) ◽  
pp. 467-488 ◽  
Author(s):  
J. Liang ◽  
B. Ni ◽  
C. M. Cully ◽  
E. F. Donovan ◽  
R. M. Thorne ◽  
...  
Keyword(s):  
Plasma Sheet ◽  
Occurrence Rate ◽  
Lower Hybrid ◽  
Angle Distribution ◽  
Frequency Range ◽  
Frequency Wave ◽  
Whistler Mode ◽  
Central Plasma ◽  
Fast Flow ◽  
Flow Activity

Abstract. In this study we perform a statistical survey of the extremely-low-frequency wave activities associated with fast earthward flows in the mid-tail central plasma sheet (CPS) based upon THEMIS measurements. We reveal clear trends of increasing wave intensity with flow enhancement over a broad frequency range, from below fLH (lower-hybrid resonant frequency) to above fce (electron gyrofrequency). We mainly investigate two electromagnetic wave modes, the lower-hybrid waves at frequencies below fLH, and the whistler-mode waves in the frequency range fLH < f < fce. The waves at f < fLH dramatically intensify during fast flow intervals, and tend to contain strong electromagnetic components in the high-plasma-beta CPS region, consistent with the theoretical expectation of the lower-hybrid drift instability in the center region of the tail current sheet. ULF waves with very large perpendicular wavenumber might be Doppler-shifted by the flows and also partly contribute to the observed waves in the lower-hybrid frequency range. The fast flow activity substantially increases the occurrence rate and peak magnitude of the electromagnetic waves in the frequency range fLH < f < fce, though they still tend to be short-lived and sporadic in occurrence. We also find that the electron pitch-angle distribution in the mid-tail CPS undergoes a variation from negative anisotropy (perpendicular temperature smaller than parallel temperature) during weak flow intervals, to more or less positive anisotropy (perpendicular temperature larger than parallel temperature) during fast flow intervals. The flow-related electromagnetic whistler-mode wave tends to occur in conjunction with positive electron anisotropy.

scholarly journals Change in backbone torsion angle distribution on protein folding

2000 ◽  
Vol 9 (6) ◽  
pp. 1129-1136 ◽  
Author(s):  
Andrei-José Petrescu ◽  
Patrick Calmettes ◽  
Dominique Durand ◽  
Veronique Receveur ◽  
Jeremy C. Smith
Keyword(s):  
Protein Folding ◽  
Torsion Angle ◽  
Angle Distribution ◽  
Backbone Torsion Angle
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