Early withering of lower leaves of Phragmites australis (Cav.) Trin. ex Steud. in a eutrophic stand: role of oxygen concentration, fate of nitrogen and nitrogen uptake by the plants

1992 ◽  
Vol 42 (2) ◽  
pp. 143-157 ◽  
Author(s):  
Shiori Yamasaki ◽  
Makoto Kimura ◽  
Tadakatsu Yoneyama
Keyword(s):  
Oxygen Concentration ◽  
Phragmites Australis ◽  
Nitrogen Uptake ◽  
Fate Of Nitrogen

THE ROLE OF OXYGEN IN TISSUE MAINTENANCE: MATHEMATICAL MODELING AND QUALITATIVE ANALYSIS

2008 ◽  
Vol 18 (08) ◽  
pp. 1409-1441 ◽  
Author(s):  
AVNER FRIEDMAN ◽  
BEI HU
Keyword(s):  
Mathematical Modeling ◽  
Free Boundary ◽  
Qualitative Analysis ◽  
Phase I ◽  
Stationary Solution ◽  
Oxygen Concentration ◽  
Existence And Uniqueness ◽  
Symmetric Case ◽  
Special Case

The cells in a tissue occupying a region Ωt are divided according to their cycling phase. The density pi of cells in phase i depends on the spatial variable x, the time t, and the time si since the cells entered in phase i. The pi(x, t, si) and the oxygen concentration w(x, t) satisfy a system of PDEs in Ωt, and the boundary of Ωt is a free boundary. We denote by [Formula: see text] the oxygen concentration on the free boundary and consider the radially symmetric case, so that Ωt = {r < R(t)}. We prove that R(t) is always bounded; furthermore, if [Formula: see text] is small, then R(t) → 0 as t → ∞, and if [Formula: see text] is large, then R(t) ≥ c > 0 for all t. Finally, we prove the existence and uniqueness of a stationary solution in a special case.

scholarly journals Experimental evidence for the role of paramagnetic oxygen concentration on the decay of long-lived nuclear spin order

RSC Advances ◽  
2019 ◽  
Vol 9 (40) ◽  
pp. 23418-23424 ◽  
Author(s):  
Bryan Erriah ◽  
Stuart J. Elliott
Keyword(s):  
Experimental Evidence ◽  
Oxygen Concentration ◽  
Nuclear Spin ◽  
Longitudinal Magnetization ◽  
Spin Order

The sensitivity of longitudinal magnetization and singlet order to relaxation from dissolved paramagnetic oxygen sources in solution is investigated experimentally.

scholarly journals The Effect of Artificial Mowing on the Competition of Phragmites australis and Spartina alterniflora in the Yangtze Estuary

Scientifica ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Yue Yuan ◽  
Chao Zhang ◽  
Dezhi Li
Keyword(s):  
Spartina Alterniflora ◽  
Phragmites Australis ◽  
Native Species ◽  
Interspecific Interactions ◽  
Interaction Strength ◽  
Yangtze Estuary ◽  
The Yangtze Estuary ◽  
Neighbor Effect ◽  
Index Effect

Spartina alterniflora Loisel. is one of the most invasive species in the world. However, little is known about the role of artificial mowing in its invasiveness and competiveness. In this work, we studied the effect of mowing on its interspecific interactions with native species Phragmites australis (Cav.) Trin ex Steud of the Yangtze Estuary, China. We calculated their relative neighbor effect (RNE) index, effect of relative crowding (Dr) index, and interaction strength (I) index. The results showed that the RNE of Phragmites australis and Spartina alterniflora was 0.354 and 0.619, respectively, and they have competitive interactions. The mowing treatments can significantly influence the RNE of Phragmites australis and Spartina alterniflora on each other. Concretely, the RNE of Spartina alterniflora in the removal treatments was significantly higher than the value in the controls. But the RNE of Phragmites australis in the removal treatments was significantly lower than the value in the controls. Meanwhile, Dr of the two species on the targets was higher in the removal treatments than that in the controls, and the opposite was for I. We concluded that artificial mowing could promote the invasion of Spartina alterniflora by increasing its competitive performance compared with native species.

Functional Role of Bacteria from Invasive Phragmites australis in Promotion of Host Growth

2016 ◽  
Vol 72 (2) ◽  
pp. 407-417 ◽  
Author(s):  
M. A. Soares ◽  
H-Y. Li ◽  
K. P. Kowalski ◽  
M. Bergen ◽  
M. S. Torres ◽  
...  
Keyword(s):  
Phragmites Australis ◽  
Functional Role ◽  
Host Growth

Integrated study of the role of Phragmites australis in azo-dye treatment in a constructed wetland: From pilot to molecular scale

2009 ◽  
Vol 35 (6) ◽  
pp. 961-970 ◽  
Author(s):  
L.C. Davies ◽  
G.J.M. Cabrita ◽  
R.A. Ferreira ◽  
C.C. Carias ◽  
J.M. Novais ◽  
...  
Keyword(s):  
Phragmites Australis ◽  
Constructed Wetland ◽  
Azo Dye ◽  
Molecular Scale ◽  
Integrated Study

The Role of the Interstitial Oxygen in the Recovery and Evolution of the Boron Implantation Damage

2009 ◽  
Vol 156-158 ◽  
pp. 269-274
Author(s):  
Isabella Mica ◽  
Maria Luisa Polignano ◽  
F. Cazzaniga ◽  
L. Di Piazza ◽  
M. Mariani ◽  
...  
Keyword(s):  
Oxygen Concentration ◽  
Silicon Substrate ◽  
Interstitial Oxygen ◽  
Projected Range ◽  
Implantation Damage ◽  
Boron Implantation

The recovery of the boron implantation damage can be very difficult. Depending on the energy and the dose many dislocations are generated at the projected range of the boron implantation. The morphology of these dislocations depends on the silicon substrate. In this work we demonstrate that the interstitial oxygen concentration ([Oi]) is related with the dislocation dimension, density end morphology. Particularly long dislocation dipoles were generated by the boron implantation in substrate with interstitial oxygen, and their density is connected with the [Oi] concentration.

Habitat Characteristics ofEurytemora lacustris(Poppe, 1887) (Copepoda, Calanoida): The Role of Lake Depth, Temperature,Oxygen Concentration and Light Intensity

2005 ◽  
Vol 90 (3) ◽  
pp. 292-309 ◽  
Author(s):  
Peter Kasprzak ◽  
Claudia Reese ◽  
Rainer Koschel ◽  
Michael Schulz ◽  
Lusine Hambaryan ◽  
...  
Keyword(s):  
Light Intensity ◽  
Oxygen Concentration ◽  
Habitat Characteristics ◽  
Lake Depth
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