Spatio-Temporal Organization of the Apoplast as a Signal Effector in Cell Growth Polarity: Experimental Evidence

1987 ◽  
pp. 129-138 ◽  
Author(s):  
Béatrice Satiat-Jeunemaitre
Keyword(s):  
Cell Growth ◽  
Experimental Evidence ◽  
Temporal Organization ◽  
Growth Polarity ◽  
Spatio Temporal

scholarly journals The spatio-temporal organization of mitochondrial F1FO ATP synthase in cristae depends on its activity mode

2020 ◽  
Vol 1861 (1) ◽  
pp. 148091 ◽  
Author(s):  
Kirill Salewskij ◽  
Bettina Rieger ◽  
Frances Hager ◽  
Tasnim Arroum ◽  
Patrick Duwe ◽  
...  
Keyword(s):  
Atp Synthase ◽  
Temporal Organization ◽  
F1fo Atp Synthase ◽  
Activity Mode ◽  
Spatio Temporal

scholarly journals Discrete simulations of spatio-temporal dynamics of small water bodies under varied stream flow discharges

2005 ◽  
Vol 12 (1) ◽  
pp. 31-40 ◽  
Author(s):  
B. S. Daya Sagar
Keyword(s):  
Water Body ◽  
Stream Flow ◽  
Fractal Dimensions ◽  
Temporal Patterns ◽  
Temporal Organization ◽  
Water Bodies ◽  
Flow Discharge ◽  
Small Water ◽  
Spatio Temporal ◽  
Small Water Bodies

Abstract. Spatio-temporal patterns of small water bodies (SWBs) under the influence of temporally varied stream flow discharge are simulated in discrete space by employing geomorphologically realistic expansion and contraction transformations. Cascades of expansion-contraction are systematically performed by synchronizing them with stream flow discharge simulated via the logistic map. Templates with definite characteristic information are defined from stream flow discharge pattern as the basis to model the spatio-temporal organization of randomly situated surface water bodies of various sizes and shapes. These spatio-temporal patterns under varied parameters (λs) controlling stream flow discharge patterns are characterized by estimating their fractal dimensions. At various λs, nonlinear control parameters, we show the union of boundaries of water bodies that traverse the water body and non-water body spaces as geomorphic attractors. The computed fractal dimensions of these attractors are 1.58, 1.53, 1.78, 1.76, 1.84, and 1.90, respectively, at λs of 1, 2, 3, 3.46, 3.57, and 3.99. These values are in line with general visual observations.

Spatio-Temporal Organization of the Mitochondrial Phase of Apoptosis

IUBMB Life ◽  
2001 ◽  
Vol 52 (3-5) ◽  
pp. 237-245 ◽  
Author(s):  
György Hajnóczky ◽  
Pál Pacher ◽  
Xuena Lin
Keyword(s):  
Temporal Organization ◽  
Spatio Temporal

scholarly journals Cross-linker–mediated regulation of actin network organization controls tissue morphogenesis

2019 ◽  
Vol 218 (8) ◽  
pp. 2743-2761 ◽  
Author(s):  
Daniel Krueger ◽  
Theresa Quinkler ◽  
Simon Arnold Mortensen ◽  
Carsten Sachse ◽  
Stefano De Renzis
Keyword(s):  
Myosin Ii ◽  
Temporal Organization ◽  
Tissue Morphogenesis ◽  
Animal Development ◽  
Spatio Temporal ◽  
Development In Vitro ◽  
Short Time ◽  
Actomyosin Contraction

Contraction of cortical actomyosin networks driven by myosin activation controls cell shape changes and tissue morphogenesis during animal development. In vitro studies suggest that contractility also depends on the geometrical organization of actin filaments. Here we analyze the function of actomyosin network topology in vivo using optogenetic stimulation of myosin-II in Drosophila embryos. We show that early during cellularization, hexagonally arrayed actomyosin fibers are resilient to myosin-II activation. Actomyosin fibers then acquire a ring-like conformation and become contractile and sensitive to myosin-II. This transition is controlled by Bottleneck, a Drosophila unique protein expressed for only a short time during early cellularization, which we show regulates actin bundling. In addition, it requires two opposing actin cross-linkers, Filamin and Fimbrin. Filamin acts synergistically with Bottleneck to facilitate hexagonal patterning, while Fimbrin controls remodeling of the hexagonal network into contractile rings. Thus, actin cross-linking regulates the spatio-temporal organization of actomyosin contraction in vivo, which is critical for tissue morphogenesis.

Imaging the invisible: resolving cellular microcompartments by superresolution microscopy techniques

2013 ◽  
Vol 394 (9) ◽  
pp. 1097-1113 ◽  
Author(s):  
Michael Hensel ◽  
Jürgen Klingauf ◽  
Jacob Piehler
Keyword(s):  
Imaging Techniques ◽  
Live Cell ◽  
Temporal Organization ◽  
Membrane Microdomains ◽  
Superresolution Microscopy ◽  
Neuronal Synapses ◽  
Spatio Temporal ◽  
Microscopy Techniques ◽  
Plasma Membrane Microdomains ◽  
Diffraction Barrier

Abstract Unraveling the spatio-temporal organization of dynamic cellular microcompartments requires live cell imaging techniques capable of resolving submicroscopic structures. While the resolution of traditional far-field fluorescence imaging techniques is limited by the diffraction barrier, several fluorescence-based microscopy techniques providing sub-100 nm resolution have become available during the past decade. Here, we briefly introduce the optical principles of these techniques and compare their capabilities and limitations with respect to spatial and temporal resolution as well as live cell capabilities. Moreover, we summarize how these techniques contributed to a better understanding of plasma membrane microdomains, the dynamic nanoscale organization of neuronal synapses and the sub-compartmentation of microorganisms. Based on these applications, we highlight complementarity of these techniques and their potential to address specific challenges in the context of dynamic cellular microcompartments, as well as the perspectives to overcome current limitations of these methods.

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