scholarly journals Interceptação em uma floresta ripária secundária urbana em Santarém- PA, Amazônia, Brasil

2020 ◽  
Vol 42 ◽  
pp. e1
Author(s):  
Milena Míria Nobre Campos ◽  
Mírian Santos de Sousa ◽  
Bruno De Oliveira Ribeiro ◽  
Leidiane Leão de Oliveira
Keyword(s):  
Forest Floor ◽  
Riparian Forest ◽  
Urban Runoff ◽  
High Volume ◽  
Total Precipitation ◽  
Forest Trees ◽  
Open Area ◽  
Rain Gauges ◽  
Amazon Ecosystem

The interception of rain by riparian forest trees plays an important role in the urban Amazon ecosystem. It affects all hydrological processes, as well as the spatial and temporal redistribution of moisture. The aim of this study was to evaluate rainfall interception in an area of urban riparian forest at the source of the Irurá stream, Santarém-PA. The monitoring of precipitation in the open area and precipitation in the internal area occurred with the use of Ville de Paris type rain gauges and gutters. Runoff through the trunk was monitored within a 10 m x 10 m plot. During the study period, 2,659.6 mm of rain was accounted for rainfall above the canopy, 89.3% reached the forest floor as internal precipitation and only 0.5% as runoff through the tree trunk. The trees of the urban secondary riparian forest from the source of the Irurá stream intercepted 272 mm, that is, 10.2% of the total precipitation, representing an important role for the hydrology of the area, both because it allows a high volume of water to return to the atmosphere, as by minimizing the increase in urban runoff. In this study it was possible to quantify and qualify the important role of the components for the recharge of groundwater from the urban spring.

The role of wood decay fungi in the carbon and nitrogen dynamics of the forest floor

2009 ◽  
pp. 151-181 ◽  
Author(s):  
Sarah Watkinson ◽  
Dan Bebber ◽  
Peter Darrah ◽  
Mark Fricker ◽  
Monika Tlalka ◽  
...  
Keyword(s):  
Forest Floor ◽  
Wood Decay ◽  
Nitrogen Dynamics ◽  
Decay Fungi ◽  
Carbon And Nitrogen ◽  
Wood Decay Fungi ◽  
Carbon And Nitrogen Dynamics

The Role of Ectomycorrhizal Symbiosis in the Resistance of Forests to Water Stress

2000 ◽  
Vol 29 (1) ◽  
pp. 63-69 ◽  
Author(s):  
Jean Garbaye
Keyword(s):  
Water Stress ◽  
Sustainable Management ◽  
Fine Roots ◽  
Forest Ecosystems ◽  
Water Status ◽  
Forest Trees ◽  
Direct Effects ◽  
Ectomycorrhizal Symbiosis ◽  
Protection Mechanisms

Forest trees live in enforced symbiosis with specialized fungi that form composite organs (ectomycorrhizas) with fine roots. This paper examines how this association contributes to the water status of trees and how it plays a major role in the protection mechanisms by which trees and forest stands resist drought-induced water stress. It shows how ectomycorrhizal symbiosis has both direct effects (at the uptake level) and indirect effects (at the regulation level) on the water status of trees. The facts presented are discussed in terms of forest adaptation to changing environmental conditions and the practical consequences for the sustainable management of forest ecosystems.

scholarly journals The role of cardiomyocyte apoptosis in mechanisms of ischemic myocardial remodeling

2008 ◽  
Vol 7 (3) ◽  
pp. 33-38
Author(s):  
A. P. Khlapov ◽  
Yu. Yu. Vechersky ◽  
N. V. Ryazantseva ◽  
V. V. Kalyuzhin ◽  
L. R. Mustafina ◽  
...  
Keyword(s):  
Heart Failure ◽  
Left Ventricle ◽  
Coronary Arteries ◽  
High Volume ◽  
Cardiomyocyte Apoptosis ◽  
Atherosclerotic Disease ◽  
Myocardial Remodeling ◽  
Early Stages

Here the role of cardiomyocyte apoptosis in mechanisms of ischemic myocardial remodeling was investigated. The samples of left ventricle were obtained on 50 patients with the diagnosed atherosclerotic disease of coronary arteries and heart failure. Obtained data allow to approve about the maximal importance of cardiomyocyte apoptosis at an early stages of ischemic myocardial remodeling. The role of cardiomyocyte apoptosis was decreased at a high volume of left ventricle. The received results suggest about an importance of cardiomyocyte apoptosis as an marker of ischemic myocardial remodeling and heart failure.

scholarly journals The role of Edge-Driven Convection in the generation of volcanism I: a 2D systematic study

2020 ◽  
Author(s):  
Antonio Manjón-Cabeza Córdoba ◽  
Maxim Ballmer
Keyword(s):  
Numerical Models ◽  
High Volume ◽  
Oceanic Lithosphere ◽  
Companion Paper ◽  
Small Scale ◽  
Continental Lithosphere ◽  
Transient Phenomenon ◽  
Mantle Viscosity ◽  
Wide Range

Abstract. The origin of intraplate volcanism is not explained by the plate tectonic theory, and several models have been put forward for explanation. One of these models involves Edge-Driven Convection (EDC), in which cold and thick continental lithosphere is juxtaposed to warm and thin oceanic lithosphere to trigger convective instability. To test whether EDC can produce long-lived high-volume magmatism, we run numerical models of EDC for a wide range of mantle properties and edge (i.e., the oceanic-continental transition) geometries. We find that the most important parameters that govern EDC are the rheological paramaters mantle viscosity η0 and activation energy Ea. However, even the maximum melting volumes found in our models are insufficient to account for island-building volcanism on old seafloor, such as at the Canary Islands and Cape Verde. Also, beneath old seafloor, localized EDC-related melting commonly transitions into widespread melting due to small-scale sublithospheric convection, inconsistent with the distribution of volcanism at these volcanic chains. In turn, EDC is a good candidate to sustain the formation of small seamounts on young seafloor, as it is a highly transient phenomenon that occurs in all our models soon after initiation. In a companion paper, we investigate the implications of interaction of EDC with mantle-plume activity.

scholarly journals Huftiere und Verjüngung im Gebirgswald: eine Geschichte mit vielen Variablen und noch mehr Interaktionen | Ungulates and Tree Regeneration in Mountain Forests: an Issue with many Variables and even more Interactions

2000 ◽  
Vol 151 (4) ◽  
pp. 99-106 ◽  
Author(s):  
Josef Senn
Keyword(s):  
Tree Regeneration ◽  
Small Scale ◽  
Mountain Forest ◽  
Forest Trees ◽  
Mountain Forests ◽  
Wild Ungulates ◽  
Site Factors ◽  
The Past

After excessive cutting in Swiss mountain forests and extirpation of most of the wildlife during the past centuries, efficient forestry and hunting laws allowed a wide regeneration of the forests and a rapid increase of ungulate populations in the present century. As a consequence, the impacts of ungulates on the vegetation became obvious. Regeneration of forest trees, however, is influenced not only by ungulates, but by a number of physical site factors and biotic impacts. As these impacts and their interactions vary extensively, regeneration is neither spatially nor temporally constant. Most of the presently used tree-regeneration methods, however, assume constant conditions, which renders a proper evaluation of tree regeneration in mountain forests and the role of ungulates impossible. Furthermore, the effect of this variation on forest development and forest functions is unknown with regard to the long term. While society requires a multipurpose mountain forest, structured at a small scale, wild ungulates use their habitat at a larger scale. This often leads to conflicts. Consequently,solutions including different scales are necessary. A lack of knowledge will, therefore, have to be met by research making data available to the practice as well as through coordinated investigations and experiments.

scholarly journals The role of edge-driven convection in the generation of volcanism – Part 1: A 2D systematic study

Solid Earth ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 613-632
Author(s):  
Antonio Manjón-Cabeza Córdoba ◽  
Maxim D. Ballmer
Keyword(s):  
Numerical Models ◽  
High Volume ◽  
Oceanic Lithosphere ◽  
Companion Paper ◽  
Rheological Parameters ◽  
Small Scale ◽  
Transient Phenomenon ◽  
Mantle Viscosity ◽  
Wide Range

Abstract. The origin of intraplate volcanism is not explained by plate tectonic theory, and several models have been put forward for explanation. One of these models involves edge-driven convection (EDC), in which cold and thick continental lithosphere is juxtaposed with warm and thin oceanic lithosphere to trigger convective instability. To test whether EDC can produce long-lived high-volume magmatism, we run numerical models of EDC for a wide range of mantle properties and edge (i.e., the oceanic–continental transition) geometries. We find that the most important parameters that govern EDC are the rheological parameters mantle viscosity η0 and activation energy Ea. However, even the maximum melting volumes predicted by our most extreme cases are insufficient to account for island-building volcanism on old seafloor, such as at the Canary Islands and Cabo Verde. Also, beneath old seafloor, localized EDC-related melting commonly transitions into widespread melting due to small-scale sublithospheric convection, inconsistent with the distribution of volcanism at these volcano chains. In turn, EDC is a good candidate to sustain the formation of small seamounts on young seafloor, as it is a highly transient phenomenon that occurs in all our models soon after initiation. In a companion paper, we investigate the implications of interaction of EDC with mantle plume activity (Manjón-Cabeza Córdoba and Ballmer, 2021).

scholarly journals The role of corporate communication in intelligent organizations

2019 ◽  
Vol 35 (65) ◽  
pp. 105-117
Author(s):  
Jonathan Lozano Oviedo
Keyword(s):  
Knowledge Society ◽  
High Volume ◽  
Corporate Communication ◽  
Effective Management ◽  
Uncertain Environments ◽  
Actual Knowledge ◽  
Learning Capacity ◽  
Action Center ◽  
Intelligent Organizations

Intelligent organizations are characterized for having a high learning capacity, innovation, response and competitivity within its action center. However, corporate communication is also seen as a basic component of such organizations; being considered a pillar of effectivity in management within the organizational mark. The following article makes a reflexion around corporate communication and it’s underlying elements, perceiving it as an indispensable piece of management in the intelligent organizations that find success and are able to maintain themselves in high uncertain environments, competitivity, client’s demand and under a high volume of information that characterize the actual knowledge society. It emphasizes the necessity of the communication role value in this context and it poses a net mode from the effective management of corporate communication allowing development of organization intelligence.

scholarly journals Generic drugs: international trends and policy developments in Australia

2004 ◽  
Vol 27 (1) ◽  
pp. 39 ◽  
Author(s):  
Hans Lofgren
Keyword(s):  
Generic Drugs ◽  
Cost Savings ◽  
High Volume ◽  
Third Party ◽  
Public And Private ◽  
International Trends ◽  
Speed Up ◽  
Policy Measures ◽  
Pharmaceutical Benefits Scheme

Public and private third-party payers in many countries encourage or mandate the use of generic drugs. This articleexamines the development of generics policy in Australia, against the background of a description of internationaltrends in this area, and related experiences of reference pricing programs. The Australian generics market remainsunderdeveloped due to a historical legacy of small Pharmaceutical Benefits Scheme price differentials betweenoriginator brands and generics. It is argued that policy measures open to the Australian government can be conceivedas clustering around two different approaches: incremental changes within the existing regulatory framework, or a shifttowards a high volume/low price role of generics which would speed up the delivery of substantial cost savings, andcould provide enhanced scope for the financing of new, patented drugs.

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