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#cyanobacteria

2 posts2 participants0 posts today
Public
:rss: Hacker News

Earth's oceans used to be green, and they could turn purple next
newatlas.com/science/earths-oc
#ycombinator #ancient_oceans #early_earth #green_oceans #purple_oceans #ocean_color_change #great_oxidation_event #cyanobacteria #phycoerythrobilin #iron_precipitation #archean_eon #earth_history #ocean_chemistry #environmental_changes #ocean_color_prediction #ocean_evolution

There's evidence that cyanobacteria flourished in green seas
New Atlas · Earth’s oceans used to be green, and they could turn purple nextFor ages, Earth has been known as a blue planet, a vision largely shaped by the vast oceans that cover three-quarters of its surface. But what if this wasn't always the case, and our oceans used to be green? That's the surprising claim in a new study published in Nature Geology & Evolution.
Public
Bob LeFridge :tinoflag:

Lake Hood outside Ashburton has been closed due to cyanobacteria. It's a man-made lake in a development offering luxury lakefront properties. While it's surrounded by one of the most intensively farmed areas of New Zealand, the story doesn't mention farmers.

So far two people have been poisoned by toxic algae so the district council has made the decision to close the lake entirely.

stuff.co.nz/nz-news/360647577/

An elevated shot showing cyanobacteria infecting channels lined with houses.
#NZ#LakeHood#Cyanobacteria
Public
Lukas VFN 🇪🇺

#MolecularClock analysis shows #bacteria used oxygen long before widespread photosynthesis
phys.org/news/2025-04-molecula

A geological timescale for bacterial #evolution and oxygen adaptation science.org/doi/10.1126/scienc

"the earliest aerobic transition occurred in an ancestor of photosynthetic #cyanobacteria, indicating that the ability to utilize trace amounts of oxygen may have allowed the development of genes central to oxygenic #photosynthesis."

Illustration of chains of green bacteria and geologic layers
Public
Warren Currie 🦠🦐

Weekend #Plankton #Factoid 🦠🦐
Autotrophs are organisms which use pigments for photosynthesis by absorbing light at specific wavelengths. The dominant chlorophyll-a absorbs #light in the violet-blue (430nm) and red (660nm) wavelengths, but not green, which is why #algae is green. Phycocyanin, an accessory #pigment in #cyanobacteria, absorbs in those green wavelengths, so is blue in colour. This is why we can determine algae types from space.
scitechdaily.com/new-research-
#Science #satellites #oceans

image/jpeg a graph of pigments in algae showing absorbance of light by wavelength grom 440 (violet) to 700 nm (red). Pigments shown are chlorophyll a, chlorophyll b, chlorophyll Concentration, carotenoids, phycocyanin, phycoerythrin. Each absorb light at different wavelengths at their peaks.
image/jpeg a microscope image of a ball with tiny green dots filled with other bright green balls against a black background. Volvox Frank Fox CC-BY-SA 3.0.
image/jpeg a microscope image of a filament of cells that are slightly bluish-green coloured. Anabaena sphaerica CC-BY-SA 3.0.
Public
Christopher Kyba 🇨🇦🇪🇺

A new paper from the "Illuminating Lake Ecosystems" #ILES project (that I was involved in) shows that skyglow-like levels of #LightPollution are sufficient to change the structure of microbial communities in lakes: sciencedirect.com/science/arti

The "low" treatment was 0.06 lux, which is less than lakes typically get from moonlight. The "high" treatment was 6 lux, which would only be found inside of cities or near harbors with illumination.

Two images showing boxplots from the paper. The vertical axis is "closeness centrality", and the plots show that both treatments (0.06 and 6 lux) are different from the control treatment (natural starlight).
#Ecology#Bacteria#Cyanobacteria
Public
RashaKamel

"When populations of tiny aquatic organisms called cyanobacteria (formerly known as blue-green algae) explode, their toxic overgrowth can threaten human drinking water and cause wildlife deaths in events known as harmful algal blooms (HABs). In freshwater environments such as lakes, ponds and streams, a cyanobacterium known as Microcystis aeruginosa is responsible for most toxic harmful algal bloom episodes".
#climatechange #algalblooms #cyanobacteria

phys.org/news/2025-02-cyanobac

Phys.org · Cyanobacteria diversity challenges 'one-size-fits-all' algal bloom solutionsBy Mario Aguilera
Public
RIO Journal

💡 Innovative method uses #cyanobacteria to naturally produce 100% #biodegradable #plastics overcoming issues with scalability & #microplastic residues.

📃 Policy Brief: doi.org/10.3897/arphapreprints, published in the #openscience project collection by the #PROMICON #Horizon2020 consortium.

👉 Explore the collection at: doi.org/10.3897/rio.coll.239.

👌 So far, it presents a total of 17 project outputs, i.e. 12 research papers published in different journals, project reports, policy briefs & preprints.

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