scholarly journals Nitrogen oxides (NO and NO2) pollution in the Accra metropolis: Spatiotemporal patterns and the role of meteorology

2022 ◽  
Vol 803 ◽  
pp. 149931
Author(s):  
Jiayuan Wang ◽  
Abosede Sarah Alli ◽  
Sierra Clark ◽  
Allison Hughes ◽  
Majid Ezzati ◽  
...  
Keyword(s):  
Nitrogen Oxides ◽  
Spatiotemporal Patterns ◽  
No2 Pollution

scholarly journals Lattice-based microenvironmental uncertainty driven phenotypic decision-making: a comparison with Notch-Delta-Jagged signaling

2021 ◽  
Author(s):  
Aditi Ajith Pujar ◽  
Arnab Barua ◽  
Divyoj Singh ◽  
Ushasi Roy ◽  
Mohit Kumar Jolly ◽  
...  
Keyword(s):  
Decision Making ◽  
Variational Principle ◽  
Signaling Pathway ◽  
Biological System ◽  
Single Cells ◽  
Tissue Level ◽  
Spatiotemporal Patterns ◽  
Complex Environment ◽  
Agent Based

Phenotypic decision-making is a process of determining important phenotypes in accordance with the available microenvironmental information. Although phenotypic decision at the level of a single cell has been precisely studied, but the knowledge is still imperceptible at the multicellular level. How cells sense their environment and adapt? How single cells change their phenotype in a multicellular complex environment (without knowing the interactions among the cells), is still a rheotorical question. To unravel the fragmental story of multicellular decision-making, Least microEnvironmental Uncertainty Principle (LEUP) was refined and applied in this context. To address this set of questions, we use variational principle to grasp the role of sensitivity, build a LEUP driven agent-based model on a lattice which solely hinges on microenvironmental information and investigate the parallels in a well-known biological system, viz., Notch-Delta-Jagged signaling pathway. The analyses of this model led us to interesting spatiotemporal patterns in a population of cells, responsive to the sensitivity parameter and the radius of interaction. This resembles the tissue-level pattern of a population of cells interacting via Notch-Delta-Jagged signaling pathway in some parameter regimes.

Silica and silica–titania intercalated MCM-36 modified with iron as catalysts for selective reduction of nitrogen oxides – the role of associated reactions

2020 ◽  
Vol 10 (23) ◽  
pp. 7940-7954 ◽  
Author(s):  
Aleksandra Jankowska ◽  
Andrzej Kowalczyk ◽  
Małgorzata Rutkowska ◽  
Włodzimierz Mozgawa ◽  
Barbara Gil ◽  
...  
Keyword(s):  
High Temperature ◽  
Nitrogen Oxides ◽  
Selective Reduction ◽  
Fe Species

Fe-MCM-36 zeolites are effective catalysts for high-temperature NH3-SCR – their activity is related to effective NO to NO2 oxidation over Fe2O3 species, while high N2-selectivity is attributed to dispersed Fe-species active in N2O decomposition.

scholarly journals The role of nitrogen oxides in human adaptation to hypoxia

2011 ◽  
Vol 1 (1) ◽  
Author(s):  
Denny Z. Levett ◽  
◽  
Bernadette O. Fernandez ◽  
Heather L. Riley ◽  
Daniel S. Martin ◽  
...  
Keyword(s):  
Nitrogen Oxides ◽  
Adaptation To Hypoxia ◽  
Human Adaptation

Nitrogen oxides as environmental sensors for seeds

2003 ◽  
Vol 13 (3) ◽  
pp. 187-196 ◽  
Author(s):  
Zlatko Giba ◽  
Dragoljub Grubišić ◽  
Radomir Konjević
Keyword(s):  
Nitrogen Oxides ◽  
Climate Changes ◽  
Annual Variation ◽  
Trace Gas ◽  
Nitrate Content ◽  
Environmental Sensors ◽  
Gas Fluxes ◽  
Trace Gas Fluxes ◽  
Integral Data

AbstractNitrates have long been known to promote seed germination in many species, and various proposals have been made regarding the role of nitrates in this process. One hypothesis suggests a possible ecological role for nitrate, providing the seeds with a report of soil nitrogen status and the proximity of already established plants. However, nitrogen oxides (NO, NO2), which are present in the soil, also may be information carriers that indicate not only soil nitrate content, but also microbial activity and, therefore, soil quality. Because of annual variation of soil trace gas fluxes, seeds could be provided with information on seasonal and climate changes in their surroundings. Thus, nitrogen oxides would be the outer information carriers providing the seeds with integral data about many important factors required for successful germination and seedling establishment.

scholarly journals Dynamics and Patterns of a Diffusive Prey-Predator System with a Group Defense for Prey

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Honglan Zhu ◽  
Xuebing Zhang
Keyword(s):  
Neumann Boundary Condition ◽  
Critical Role ◽  
Neumann Boundary ◽  
Steady States ◽  
Spatiotemporal Patterns ◽  
System Parameters ◽  
Existence And Nonexistence ◽  
Group Defense ◽  
Predator System

We study a diffusive prey-predator system with a group defense for prey. Under Neumann boundary condition, we analyze local and stability of nonnegative constant steady states and the existence and nonexistence of nonconstant steady states. These results also exhibit the critical role of the system parameters leading to the formation of spatiotemporal patterns.

Post-dispersal seed predation in Pinus halepensis and consequences on seedling establishment after fire

2008 ◽  
Vol 17 (3) ◽  
pp. 407 ◽  
Author(s):  
Maria José Broncano ◽  
Anselm Rodrigo ◽  
Javier Retana
Keyword(s):  
Seed Predation ◽  
Seedling Establishment ◽  
Pinus Halepensis ◽  
Spatiotemporal Patterns ◽  
Seedling Density ◽  
Burned Areas ◽  
One Year ◽  
Rodent Populations ◽  
Very High

In the present study, we analyse the spatiotemporal patterns of seed predation and the consequences of this predation in the establishment of new Pinus halepensis individuals. Rodents were the main predators of P. halepensis seeds in burned areas, while predation by ants was considerably lower. Concerning spatiotemporal patterns of seed predation, the results obtained indicate that, although there were some small differences among distances or among seasons, removal of P. halepensis seeds was consistently very high in all situations, whether close to or far from the unburned margins, in pine or mixed forests, in different sites and in all sampling periods throughout the year. We analysed the role of seed predation on the modulation of post-fire regeneration of P. halepensis. Just after fire, no differences in seedling density were found between plots with or without rodent exclusion, probably owing to the high density of seeds on the ground and the low density of rodents affected by fire. One year after fire, when rodent populations had recovered in burned areas and seeds were much less abundant, the combination of addition of seeds and rodent exclusion led to an increase in pine seedling establishment.

Evidence for a physiological role of intracellularly occurring photolabile nitrogen oxides in human skin fibroblasts

2008 ◽  
Vol 44 (9) ◽  
pp. 1752-1761 ◽  
Author(s):  
Christian Opländer ◽  
Wiebke Wetzel ◽  
Miriam M. Cortese ◽  
Norbert Pallua ◽  
Christoph V. Suschek
Keyword(s):  
Nitrogen Oxides ◽  
Human Skin ◽  
Physiological Role ◽  
Skin Fibroblasts ◽  
Human Skin Fibroblasts
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