Pore-water response on seasonal environmental changes in intertidal sediments of the Weser Estuary, Germany

1996 ◽  
Vol 27 (4) ◽  
pp. 362-369 ◽  
Author(s):  
J. Sagemann ◽  
F. Skowronek ◽  
A. Dahmke ◽  
H. D. Schulz
Keyword(s):  
Pore Water ◽  
Environmental Changes ◽  
Intertidal Sediments ◽  
Weser Estuary ◽  
Water Response

Pore-water response on seasonal environmental changes in intertidal sediments of the Weser Estuary, Germany

1996 ◽  
Vol 27 (4) ◽  
pp. 362-369
Author(s):  
J. Sagemann ◽  
F. Skowronek ◽  
A. Dahmke ◽  
H.D. Schulz
Keyword(s):  
Pore Water ◽  
Environmental Changes ◽  
Intertidal Sediments ◽  
Weser Estuary ◽  
Water Response

scholarly journals A multilevel in situ pore-water sampler for use in intertidal sediments and laboratory microcosms

1990 ◽  
Vol 35 (6) ◽  
pp. 1381-1389 ◽  
Author(s):  
Peter G. Watson ◽  
Trish E. Frickers
Keyword(s):  
Pore Water ◽  
Intertidal Sediments ◽  
Water Sampler ◽  
Pore Water Sampler

scholarly journals A Simple And Inexpensive In Situ Pore Water Sampler For Intertidal Sediments

1988 ◽  
Vol 14 (1) ◽  
pp. 41-50 ◽  
Author(s):  
S. Alvarez-Borrego
Keyword(s):  
Pore Water ◽  
Intertidal Sediments ◽  
Water Sampler ◽  
Pore Water Sampler

Interlinked seasonal variation in biogenic nutrient fluxes and pore-water nutrient concentrations in intertidal sediments

2014 ◽  
Vol 161 (12) ◽  
pp. 2767-2779 ◽  
Author(s):  
P. Magni ◽  
S. Como ◽  
S. Montani ◽  
H. Tsutsumi
Keyword(s):  
Seasonal Variation ◽  
Pore Water ◽  
Nutrient Concentrations ◽  
Nutrient Fluxes ◽  
Intertidal Sediments

Pore Water Response of Seabed Soils during Multi-Hazards: Model Validation

2019 ◽  
Author(s):  
Ying Qing Qiu ◽  
H. Benjamin Mason ◽  
Michael H. Scott
Keyword(s):  
Model Validation ◽  
Pore Water ◽  
Hazards Model ◽  
Water Response

Seafloor sediment supply of nutrient silicon on the Greenland margin

2020 ◽  
Author(s):  
Hong Chin Ng ◽  
Lucie Cassarino ◽  
Rebecca Pickering ◽  
Malcolm Woodward ◽  
Samantha Hammond ◽  
...  
Keyword(s):  
Pore Water ◽  
Environmental Changes ◽  
Coastal Upwelling ◽  
Greenland Ice Sheet ◽  
Open Ocean ◽  
Benthic Flux ◽  
Sediment Supply ◽  
High Latitudes ◽  
Polar Ocean ◽  
Greenland Margin

<p>The biogeochemical cycling of nutrient silicon (Si) in the northern high latitudes has received increasing attention over recent years. This is in large part due to the discovery of silicon limitation of diatoms over seasonal timescales, the potential role of melting glaciers in supplying a significant amount of this nutrient to the coastal ocean, and the rapid environmental changes the polar ocean is experiencing as a result of global climate warming. However, our understanding of the nutrient Si in the polar ocean is severely restricted by the lack of knowledge of the benthic Si cycling and its controlling processes, which is due to the limited number of seafloor observations in the region. In this study, we address this knowledge gap through the acquisition of sediment pore water profiles and the execution of incubation experiments on sediment cores collected from the Greenland continental margin and the Labrador Sea.</p><p>Our results indicate a net (benthic) flux of dissolved silica (DSi) out of the sediment into the overlying seawater at the study sites. A new global compilation also reveals that benthic Si flux observed at our marginal sites are substantially higher than in the open ocean. This is likely because benthic flux in the open ocean is solely maintained by molecular diffusion along a concentration gradient, while there are additional processes: pore water advection and rapid dissolution of certain siliceous sponge groups, and other reactive silica phases, that contribute to the elevated benthic Si flux on the Greenland margin. This finding has important implications for existing evaluations of oceanic Si budgets, which have not accounted for any processes other than diffusion in the global estimation of benthic Si flux. Our results also suggest that strong benthic Si flux observed on the Greenland margin, combined with wind-driven coastal upwelling, could be a significant source of this nutrient to both the diverse (benthic) sponge communities and (planktonic) diatom productivity in the region. The magnitude of this benthic cycling could potentially rival the other continental inputs of Si in the northern high latitudes, as the first estimation of total benthic Si flux from the western Greenland shelf alone (0.04–0.27 Tmol year<sup>-1</sup>) is in the same order of magnitude as the total Si export from Greenland Ice Sheet (0.2 Tmol year<sup>-1</sup>) and the pan-Arctic rivers (0.35 Tmol year<sup>-1</sup>) respectively.</p>

Linking transcription, RNA polymerase II elongation and alternative splicing

2020 ◽  
Vol 477 (16) ◽  
pp. 3091-3104 ◽  
Author(s):  
Luciana E. Giono ◽  
Alberto R. Kornblihtt
Keyword(s):  
Gene Expression ◽  
Alternative Splicing ◽  
Rna Polymerase Ii ◽  
Environmental Changes ◽  
Transcription Elongation ◽  
Single Gene ◽  
Regulation Of Gene Expression ◽  
Regulation Of Transcription ◽  
Stepping Stones ◽  
Eukaryotic Transcription

Gene expression is an intricately regulated process that is at the basis of cell differentiation, the maintenance of cell identity and the cellular responses to environmental changes. Alternative splicing, the process by which multiple functionally distinct transcripts are generated from a single gene, is one of the main mechanisms that contribute to expand the coding capacity of genomes and help explain the level of complexity achieved by higher organisms. Eukaryotic transcription is subject to multiple layers of regulation both intrinsic — such as promoter structure — and dynamic, allowing the cell to respond to internal and external signals. Similarly, alternative splicing choices are affected by all of these aspects, mainly through the regulation of transcription elongation, making it a regulatory knob on a par with the regulation of gene expression levels. This review aims to recapitulate some of the history and stepping-stones that led to the paradigms held today about transcription and splicing regulation, with major focus on transcription elongation and its effect on alternative splicing.

Seeking to uncover biology's chemical roots

2019 ◽  
Vol 3 (5) ◽  
pp. 435-443 ◽  
Author(s):  
Addy Pross
Keyword(s):  
Environmental Changes ◽  
Biological Systems ◽  
Significant Development ◽  
The Road ◽  
Physical Chemical ◽  
Systems Chemistry ◽  
Biological World ◽  
Inanimate Matter ◽  
The Origin Of Life ◽  
Opening Up

Despite the considerable advances in molecular biology over the past several decades, the nature of the physical–chemical process by which inanimate matter become transformed into simplest life remains elusive. In this review, we describe recent advances in a relatively new area of chemistry, systems chemistry, which attempts to uncover the physical–chemical principles underlying that remarkable transformation. A significant development has been the discovery that within the space of chemical potentiality there exists a largely unexplored kinetic domain which could be termed dynamic kinetic chemistry. Our analysis suggests that all biological systems and associated sub-systems belong to this distinct domain, thereby facilitating the placement of biological systems within a coherent physical/chemical framework. That discovery offers new insights into the origin of life process, as well as opening the door toward the preparation of active materials able to self-heal, adapt to environmental changes, even communicate, mimicking what transpires routinely in the biological world. The road to simplest proto-life appears to be opening up.

Holocene diatom assemblages from Dunderbukhta sediments, West Svalbard

2019 ◽  
pp. 242-245
Author(s):  
Ksenya V. Poleshchuk ◽  
Zinaida V. Pushina ◽  
Sergey R. Verkulich
Keyword(s):  
Environmental Changes ◽  
Ecological Groups ◽  
Diatom Assemblages ◽  
Diatom Analysis ◽  
Diatom Flora ◽  
Sediment Samples ◽  
Ecological Zones ◽  
Middle Holocene ◽  
Temperature Trends

The diatom analysis results of sediment samples from Dunderbukta area (Wedel Jarlsberg Land, West Svalbard) are presented in this paper. The diatom flora consists of four ecological groups, which ratio indicates three ecological zones. These zones show environmental changes of the area in early–middle Holocene that is demonstrating periods of regression and temperature trends.

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