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Browsing 04 Earth Sciences by Author "Hassler Christel"

Now showing items 1-12 of 12

Bioavailability of organically bound Fe to model phytoplankton of the Southern Ocean

Hassler Christel; Schoemann V (Copernicus GmbH, 2009)

Iron (Fe) is known to be mostly bound to organic ligands and to limit primary productivity in the Southern Ocean. It is thus important to investigate the bioavailability of organically bound Fe. In this study, we used four ...
Characterisation Of Water Masses And Phytoplankton Nutrient Limitation In The East Australian Current Separation Zone During Spring 2008

Hassler Christel; Djajadikarta Jr; Doblin Martina; Everett Jason; Thompson Patrick (Pergamon-Elsevier Science Ltd, 2011)

This study focuses on the comparison of oceanic and coastal cold-core eddies with inner-shelf and East Australian Current (EAC) waters at the time of the spring bloom (October 2008).
Contrasting Oceanographic Conditions And Phytoplankton Communities On The East And West Coasts Of Australia

Thompson Patrick; Bonham P; Waite Am; Clementson La; Cherukuru N; Hassler Christel; Doblin Martina (Pergamon-Elsevier Science Ltd, 2011)

The composition and dynamics of the phytoplankton communities and hydrographic factors that control them are described for eastern and western Australia with a focus on the Eastern Australian Current (EAC) and Leeuwin ...
Discriminating between intra- and extracellular metals using chemical extractions: an update on the case of iron

Hassler Christel; Schoemann V (American Society of Limnology and Oceanography Inc., 2009)

Iron influences the climate system by limiting primary productivity. It is therefore essential to accurately measure the iron fraction associated with phytoplankton in aquatic systems. A washing procedure using EDTA, being ...
Distinguishing intra- from extracellular metals: chemical extraction techniques

Hassler Christel; Slaveykova V; Wilkinson K (American Society of Limnology and Oceanography Inc., 2004)

Several washing agents (EDTA, CDTA, NTA, 8 HQS, Ti-EDTA-citrate, Ca2+, and H+) were tested for their ability to extract adsorbed metal from biological surfaces to distinguish between internalized and total cellular metal ...
An evaluation of iron bioavailability and speciation in western Lake Superior with the use of combined physical, chemical, and biological assessment

Hassler Christel; Havens S; Bullerjahn G; Mckay R; Twiss M (Amer Soc Limnology and Oceanography, 2009)

An iron-dependent cyanobacterial bioreporter (Synechococcus strain KAS101) was used in unison with sizefractionated iron content (.0.45, ,0.45, ,0.02 mm), and chemical characterization of iron complexation (C18 resin column) ...
Exopolysaccharides produced by bacteria isolated from the pelagic Southern Ocean - Role in Fe binding, chemical reactivity, and bioavailability

Hassler Christel; Alasonati E; Nichols Ce; Slaveykova V (Elsevier Science Bv, 2011)

As a result of ubiquitous excretion by micro-organisms, extracellular polymeric substances are reported in high concentrations in marine systems. The majority of this material is exopolysaccharide (EPS). Despite previous ...
Iron biogeochemistry across marine systems - progress from the past decade

Breitbarth E; Achterberg E; Ardelan M; Baker A; Bucciarelli E; Chever F; Croot L; Duggen S; Gledhill M; Hassellove M; Hassler Christel; Hoffmann L; Hunter K; Hutchins D; Ingri J; Jickells T; Lohan M; Nielsdottir M; Sarthou G; Schoemann V; Trapp J; Turner D; Ye Y (Copernicus GmbH, 2010)

Based on an international workshop (Gothenburg, 14â¿¿16 May 2008), this review article aims to combine interdisciplinary knowledge from coastal and open ocean research on iron biogeochemistry. The major scientific findings ...
Iron-limitation and high light stress on phytoplankton populations from the Australian Sub-Antarctic Zone (SAZ)

Petrou Katherina; Hassler Christel; Doblin Martina; Shelly Kirsten; Schoemann V; Van Den Enden Rick; Wright Simon; Ralph Peter (Pergamon-Elsevier Science Ltd, 2011)

The high nutrient low chlorophyll (HNLC) surface waters of the Southern Ocean are characterised by high concentrations of nitrate and phosphate, low concentrations of dissolved iron and deep vertical mixing. Future climate ...
Porous underwater chamber (PUC) for in-situ determination of nutrient and pollutant bioavailability to microorganisms

Hassler Christel; Twiss M; Simon D; Wilkinson K (American Society of Limnology and Oceanography Inc., 2008)

Physical (e.g., temperature and light) and biogeochemical (e.g., cycling) parameters are known to affect bioavailability and toxicity of nutrients and pollutants to microorganisms. A system that would allow exposure of ...
Saccharides enhance iron bioavailability to Southern Ocean phytoplankton

Hassler Christel; Schoemann V; Mancuso-Nichols Carol; Butler E; Boyd Philip (National Academy of Sciences, 2011)

Journal article showing evidence that saccharides are key player in iron biogeochemistry as they form bioavailable organic form of iron mainly as colloidal iron.
The strengthening East Australian Current, its eddies and biological effects - an introduction and overview

Suthers Iain; Everett Jason; Roughan Moninya; J.W. Young; Oke Peter; Condie Scott; Hartog Jason; Baird Mark; Hassler Christel; Brassington Gary; Byrne Maria; Holbrook Neil; Malcolm Hamish (Elsevier B.V., 2011)

This is the opening paper for the special issue on the East Australian Current, which is available on line.

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Browsing 04 Earth Sciences by Author "Hassler Christel"

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Browsing 04 Earth Sciences by Author "Hassler Christel"