Traveling Waves in Natural Systems

2002 ◽  
pp. 115-131
Author(s):  
R. E. L. Turner
Keyword(s):  
Traveling Waves ◽  
Natural Systems

Effect of Iron Limitation on the Ultrastructure of Agmenellum Quadruplicatum

1981 ◽  
Vol 39 ◽  
pp. 410-411
Author(s):  
L. P. Hardie ◽  
D. L. Balkwill ◽  
S. E. Stevens
Keyword(s):  
Growth Medium ◽  
Green Alga ◽  
Natural Habitat ◽  
Iron Limitation ◽  
Natural Environments ◽  
Blue Green Alga ◽  
Marine Cyanobacterium ◽  
Natural Systems ◽  
Thin Sectioning ◽  
Agmenellum Quadruplicatum

Agmenellum quadruplicatum is a unicellular, non-nitrogen-fixing, marine cyanobacterium (blue-green alga). The ultrastructure of this organism, when grown in the laboratory with all necessary nutrients, has been characterized thoroughly. In contrast, little is known of its ultrastructure in the specific nutrient-limiting conditions typical of its natural habitat. Iron is one of the nutrients likely to limit this organism in such natural environments. It is also of great importance metabolically, being required for both photosynthesis and assimilation of nitrate. The purpose of this study was to assess the effects (if any) of iron limitation on the ultrastructure of A. quadruplicatum. It was part of a broader endeavor to elucidate the ultrastructure of cyanobacteria in natural systemsActively growing cells were placed in a growth medium containing 1% of its usual iron. The cultures were then sampled periodically for 10 days and prepared for thin sectioning TEM to assess the effects of iron limitation.

Modulating excitability in the cortical network: impact on emergent activity and traveling waves

2014 ◽  
Vol 1 ◽  
pp. 563-565
Author(s):  
M.V. Sanchez-Vives ◽  
Maurizio Mattia
Keyword(s):  
Traveling Waves ◽  
Cortical Network

THE PLASMA ANTENNA WITH AZIMUTHAL-ASYMMETRICAL TRAVELING WAVES OF CURRENT

2018 ◽  
Vol 77 (10) ◽  
pp. 863-874
Author(s):  
V. D. Karlov ◽  
Yu. V. Kirichenko
Keyword(s):  
Traveling Waves ◽  
Plasma Antenna

How hunting strengthens social awareness of coupled human-natural systems

2011 ◽  
Vol 6 (2) ◽  
Author(s):  
M. Nils Peterson ◽  
Hans Peter Hansen ◽  
Markus J Peterson ◽  
Tarla R. Peterson
Keyword(s):  
Social Awareness ◽  
Natural Systems

Implementation of active suppression of traveling waves in structures

1987 ◽  
Author(s):  
JEFFREY RENNIGHOFT ◽  
LEONARD MEIROVITCH
Keyword(s):  
Traveling Waves ◽  
Active Suppression

ECOLOGICAL-GEOLOGICAL PASSPORTIZATIONOF NATURAL SYSTEMS OF THE NOVOSIBIRSK PRIOBYE REGION

2019 ◽  
Vol 41 (4) ◽  
pp. 398-409
Author(s):  
Lidiya Senkova ◽  
Anastasia Kiseleva ◽  
Valeriya Tskhovrebov
Keyword(s):  
Natural Systems

DRAINAGE BASIN AS A COMPLEX SOCIO-NATURAL HIERARCHICAL SYSTEM

2020 ◽  
Vol 42 (3) ◽  
pp. 293-303
Author(s):  
VALERIY BONDAREV
Keyword(s):  
Drainage Basin ◽  
Temporal Analysis ◽  
Large River ◽  
Hierarchical Level ◽  
Effective Management ◽  
Drainage Basins ◽  
Time Intervals ◽  
Natural Systems ◽  
Spatial And Temporal Analysis ◽  
Entire Complex

The theoretical and methodological basis of the systems hierarchical spatial and temporal analysis of a drainage basin, which addresses the problems of effective management in socio-natural systems of different ranks, is considered. It is proposed to distinguish 9 orders of forms that are relevant to the analysis of drainage basins, where the first level is represented by individual aggregates and particles, and the last - by basins of large and the largest rivers. As part of the allocation of geological, historical and modern time intervals, the specificity of the implementation of processes in basins of different scales from changing states, through functioning to evolution is demonstrated. The interrelation of conditions and factors that determine the processes occurring within the drainage basins is revealed. It is shown that a specific combination of conditions and factors that determine processes in the drainage basin is associated with the hierarchy of the objects under consideration, i.e. the choice of a spatial-temporal hierarchical level is crucial for the organization of study within drainage basins. At one hierarchical level, some phenomenon can be considered as a factor, and at another - as a condition. For example, tectonic processes can be considered as an active factor in the evolution of large river basins in the geological perspective, but for small drainage basin, this is already a conservative background condition. It is shown that at the historical time the anthropogenic factor often comes to the fore, with the appearance of which in the functioning of the drainage basin, there is a need to take into account the entire complex of socio-environmental problems that can affect the sustainable state of various territories, especially in the field of water and land use. Hierarchical levels of managing subjects are identified, which are primarily responsible for effective management at the appropriate hierarchical level of the organization of the socio-natural system within the catchment area, starting from an individual to humankind as a whole.

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