The Island - The Island.lk

The Island  The Island.lk

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COVID-19 Daily Update April 29, 2020 - S&P Global

COVID-19 Daily Update April 29, 2020  S&P Global

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Tuesday, April 28, 2020

Reel Time: For the birds - The Anna Maria Island Sun Newspaper

Reel Time: For the birds  The Anna Maria Island Sun Newspaper

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Prevent mosquito-borne diseases - Middletown Transcript

Prevent mosquito-borne diseases  Middletown Transcript

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Genomic secrets of scaly-foot snail from hydrothermal vents

Researchers have decoded for the first time the genome of Scaly-foot Snail, a rare snail inhabited in what scientists called 'the origin of life'- deep-sea hydrothermal vents characterized with near-impossible living conditions. Unraveling the genome of this unique creature will not only shed light on how life evolved billions of years ago, but will also lay the foundation for the discovery of potential remedies offered by these ancient creatures.

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Plastic pollution reaching the Antarctic

Food wrapping, fishing gear and plastic waste continue to reach the Antarctic. Two new studies detail how plastic debris is reaching sub-Antarctic islands.

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Oceans feeling the heat - NBC4 WCMH-TV

Oceans feeling the heat  NBC4 WCMH-TV

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Oceans feeling the heat - NBC4 WCMH-TV

Oceans feeling the heat  NBC4 WCMH-TV

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Saturday, April 25, 2020

Judge Tosses Major Keystone XL Permit - EcoWatch

Judge Tosses Major Keystone XL Permit  EcoWatch

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Researchers explore ocean microbes’ role in climate effects

A new study shows that “hotspots” of nutrients surrounding phytoplankton — which are tiny marine algae producing approximately half of the oxygen we breathe every day — play an outsized role in the release of a gas involved in cloud formation and climate regulation.

The new research quantifies the way specific marine bacteria process a key chemical called dimethylsulfoniopropionate (DMSP), which is produced in enormous amounts by phytoplankton. This chemical plays a pivotal role in the way sulfur and carbon get consumed by microorganisms in the ocean and released into the atmosphere.

The work is reported today in the journal Nature Communications, in a paper by MIT graduate student Cherry Gao, former MIT professor of civil and environmental engineering Roman Stocker (now a professor at ETH Zurich, in Switzerland), in collaboration with Jean-Baptiste Raina and Professor Justin Seymour of University of Technology Sydney in Australia, and four others.

More than a billion tons of DMSP is produced annually by microorganisms in the oceans, accounting for 10 percent of the carbon that gets taken up by phytoplankton — a major “sink” for carbon dioxide, without which the greenhouse gas would be building up even faster in the atmosphere. But exactly how this compound gets processed and how its different chemical pathways figure into global carbon and sulfur cycles had not been well-understood until now, Gao says.

“DMSP is a major nutrient source for bacteria,” she says. “It satisfies up to 95 percent of bacterial sulfur demand and up to 15 percent of bacterial carbon demand in the ocean. So given the ubiquity and the abundance of DMSP, we expect that these microbial processes would have a significant role in the global sulfur cycle.”

Gao and her co-workers genetically modified a marine bacterium called Ruegeria pomeroyi, causing it to fluoresce when one of two different pathways for processing DMSP was activated, allowing the relative expression of the processes to be analyzed under a variety of conditions.

One of the two pathways, called demethylation, produces carbon and sulfur based nutrients that the microbes can use to sustain their growth. The other pathway, called cleavage, produces a gas called dimethylsulfide (DMS), which Gao explains “is the compound that’s responsible for the smell of the sea. I actually smelled the ocean a lot in the lab when I was experimenting.”

DMS is the gas responsible for most of the biologically derived sulfur that enters the atmosphere from the oceans. Once in the atmosphere, sulfur compounds are a key source of condensation for water molecules, so their concentration in the air affects both rainfall patterns and the overall reflectivity of the atmosphere through cloud generation. Understanding the process responsible for much of that production could be important in multiple ways for refining climate models.

Those climate implications are “why we're interested in knowing when bacteria decide to use the cleavage pathway versus the demethylation pathway,” in order to better understand how much of the important DMS gets produced under what conditions, Gao says. “This has been an open question for at least two decades.”

The new study found that the concentration of DMSP in the vicinity regulates which pathway the bacteria use. Below a certain concentration, demethylation was dominant, but above a level of about 10 micromoles, the cleavage process dominated.

“What was really surprising to us was, upon experimentation with the engineered bacteria, we found that the concentrations of DMSP in which the cleavage pathway dominates is higher than expected — orders of magnitude higher than the average concentration in the ocean,” she says.

That suggests that this process hardly takes place under typical ocean conditions, the researchers concluded. Rather, microscale “hotspots” of elevated DMSP concentration are probably responsible for a highly disproportionate amount of global DMS production. These microscale “hotspots” are areas surrounding certain phytoplankton cells where extremely high amounts of DMSP are present at about a thousand times greater than average oceanic concentration.

“We actually did a co-incubation experiment between the engineered bacteria and a DMSP-producing phytoplankton,” Gao says. The experiment showed “that indeed, bacteria increased their expression of the DMS-producing pathway, closer to the phytoplankton.”

The new analysis should help researchers understand key details of how these microscopic marine organisms, through their collective behavior, are affecting global-scale biogeochemical and climatic processes, the researchers say.

The research team included MIT and ETH Zurich postdocs Vicente Fernandez and Kang Soo Lee, graduate student Simona Fenizia, and Professor Georg Pohnert at Friedrich Schiller University in Germany. The work was supported by the Gordon and Betty Moore Foundation, the Simons Foundation, the National Science Foundation, and the Australian Research Council.



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Mangroves and Manatee Poop - The Bentley University Newsroom

Mangroves and Manatee Poop  The Bentley University Newsroom

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When It Comes to Water, Think Global - NASA

When It Comes to Water, Think Global  NASA

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Raising Captain Planets - CSRwire.com

Raising Captain Planets  CSRwire.com

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News - COVID-19 Trumps Climate Concerns - The Heartland Institute

News - COVID-19 Trumps Climate Concerns  The Heartland Institute

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Rising carbon dioxide levels will change marine habitats and fish communities

Researchers showed that elevated dissolved CO2 conditions can lead to a 45% decrease of fish diversity.

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10 Secret Islands in Florida - Coastal Living

10 Secret Islands in Florida  Coastal Living

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10 Secret Islands in Florida - Coastal Living

10 Secret Islands in Florida  Coastal Living

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