scholarly journals Orientational ordering in hard rectangles: The role of three-body correlations

2006 ◽  
Vol 125 (1) ◽  
pp. 014501 ◽  
Author(s):  
Yuri Martínez-Ratón ◽  
Enrique Velasco ◽  
Luis Mederos
Keyword(s):  
Orientational Ordering ◽  
Three Body

ZERO AND FINITE TEMPERATURE STUDY OF SINGLE FULLERENE CAGES AND CARBON “ONIONS” — GEOMETRY AND SHAPE

1993 ◽  
Vol 07 (29n30) ◽  
pp. 1883-1895 ◽  
Author(s):  
A. MAITI ◽  
C.J. BRABEC ◽  
J. BERNHOLC
Keyword(s):  
Interatomic Potential ◽  
Critical Size ◽  
Tight Binding ◽  
Configurational Entropy ◽  
Electronic Structure Calculations ◽  
Carbon Onions ◽  
Three Body ◽  
Structure Calculations ◽  
Scaling Arguments

Scaling arguments are used to show that above a critical size of several thousand atoms, there is a stability crossover from single to multilayer cages. Conjugate gradient minimization using a classical three-body interatomic potential, as well as tight-binding electronic structure calculations yield ground-state configurations for large fullerene shells that are polyhedral with clearly faceted geometry. The structure, energetics and configurational entropy associated with low-energy defects are calculated and the number of defects estimated as a function of temperature. The role of these thermally generated defects on the shape of large fullerenes is investigated in order to explain the nearly spherical shapes of the newly discovered carbon “onions”.

scholarly journals Gastruloids develop the three body axes in the absence of extraembryonic tissues and spatially localised signalling

2017 ◽  
Author(s):  
D.A. Turner ◽  
L. Alonso-Crisostomo ◽  
M. Girgin ◽  
P. Baillie-Johnson ◽  
C. R. Glodowski ◽  
...  
Keyword(s):  
Embryonic Stem ◽  
Model System ◽  
The Body ◽  
Genetic Studies ◽  
Animal Development ◽  
Embryonic Tissues ◽  
Bmp Signalling ◽  
Three Body ◽  
Extraembryonic Tissues

AbstractEstablishment of the three body axes is a critical step during animal development. In mammals, genetic studies have shown that a combination of precisely deployed signals from extraembryonic tissues position the anteroposterior axis (AP) within the embryo and lead to the emergence of the dorsoventral (DV) and left-right (LR) axes. We have used Gastruloids, embryonic organoids, as a model system to understand this process and find that they are able to develop AP, DV and LR axes as well as to undergo axial elongation in a manner that mirror embryos. The Gastruloids can be grown for 160 hours and form derivatives from ectoderm, mesoderm and endoderm. We focus on the AP axis and show that in the Gastruloids this axis is registered in the expression of T/Bra at one pole that corresponds to the tip of the elongation. We find that localisation of T/Bra expression depends on the combined activities of Wnt/β-Catenin and Nodal/Smad2,3 signalling, and that BMP signalling is dispensable for this process. Furthermore, AP axis specification occurs in the absence of both extraembryonic tissues and of localised sources of signalling. Our experiments show that Nodal, together with Wnt/β-Catenin signalling, is essential for the expression of T/Bra but that Wnt signalling has a separable activity in the elongation of the axis. The results lead us to suggest that, in the embryo, the role of the extraembryonic tissues might not be to induce the axes but to bias an intrinsic ability of the embryo to break its initial symmetry and organise its axes.One sentence summaryCulture of aggregates of defined number of Embryonic Stem cells leads to self-organised embryo-like structures which, in the absence of localised signalling from extra embryonic tissues and under the autonomous influence of Wnt and Nodal signalling, develop the three main axes of the body.

The Role of Excited-State Topology in Three-Body Dissociation of sym-Triazine

Science ◽  
2008 ◽  
Vol 321 (5890) ◽  
pp. 826-830 ◽  
Author(s):  
J. D. Savee ◽  
V. A. Mozhayskiy ◽  
J. E. Mann ◽  
A. I. Krylov ◽  
R. E. Continetti
Keyword(s):  
Excited State ◽  
Three Body

Role of the Lubricant in Three-body Abrasion

Nature ◽  
1970 ◽  
Vol 226 (5244) ◽  
pp. 446-447 ◽  
Author(s):  
C. PRITCHARD
Keyword(s):  
Three Body Abrasion ◽  
Three Body

Role of relativistic effects and three-body forces in nuclear matter properties

2019 ◽  
Vol 99 (2) ◽  
Author(s):  
S. Heidari ◽  
S. Zaryouni ◽  
H. R. Moshfegh ◽  
S. Goudarzi
Keyword(s):  
Nuclear Matter ◽  
Relativistic Effects ◽  
Body Forces ◽  
Three Body

scholarly journals Role of Three-Body Potentials in Disordered Alloys. I: Binary Alloys

1971 ◽  
Vol 46 (6) ◽  
pp. 1690-1702 ◽  
Author(s):  
G. B. Taggart ◽  
R. A. Tahir-Kheli
Keyword(s):  
Binary Alloys ◽  
Disordered Alloys ◽  
Three Body
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