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#oxygen

2 posts2 participants0 posts today
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Dragofix

Oxygen is running low in inland waters—and human activities are to blame phys.org/news/2025-04-oxygen-i

Oxygen is running low in inland waters, and humans are to blame sciencedaily.com/releases/2025

phys.orgOxygen is running low in inland waters—and human activities are to blameRivers, streams, lakes, and reservoirs aren't just scenic parts of our landscape—they're also vital engines for life on Earth. These inland waters "breathe" oxygen, just like we do. But a new study led by Utrecht University researchers shows that we've been suffocating them during the last century, an era also known as the Anthropocene. The research, published today in Science Advances, reveals that the way oxygen is produced and used in inland waters has dramatically changed since 1900. The culprit? Human activities.
#environment#water#waters
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michael

3-Apr-2025
#MolecularClock analysis shows #bacteria used #oxygen long before widespread photosynthesis
Scientists use the #GreatOxidationEvent and how organisms adapted to it to map bacterial #evolution

eurekalert.org/news-releases/1 #science #astrobiology

EurekAlert!Molecular clock analysis shows bacteria used oxygen long before widespread photosynthesisIn a new study published in Science, researchers from the Model-Based Evolutionary Genomics Unit at the Okinawa Institute of Science and Technology (OIST) and their international collaborators have constructed a detailed timeline for bacterial evolution and oxygen adaptation. Their findings suggest some bacteria could use trace oxygen long before evolving the ability to produce it through photosynthesis. 
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Niels de Winter

Exploring macroevolutionary links in multi-species #planktonic #foraminifera Mg∕Ca and stable #oxygen #isotope from 15 Ma to recent @EGU_BioGeo bg.copernicus.org/articles/22/

bg.copernicus.orgExploring macroevolutionary links in multi-species planktonic foraminiferal Mg∕Ca and δ18O from 15 Ma to recentAbstract. The ratio of the trace element Mg over Ca (Mg/Ca) and the oxygen isotopic composition (δ18O) of foraminiferal calcite are widely employed for reconstructing past ocean temperatures, although geochemical signals are also influenced by several other factors that vary temporally and spatially. Here, we analyse a global dataset of Mg/Ca and δ18O data of 59 middle Miocene to recent species of planktonic foraminifera from a wide range of depth habitats, many of which have never been analysed before for Mg/Ca. We investigate the extent to which Mg/Ca and δ18O covary through time and space and identify several sources of mismatch between the two proxies. Once the data are adjusted for long-term non-thermal factors, Mg/Ca and δ18O are overall positively correlated in a way consistent with temperature being the dominant controller through both space and time and across many different species, including deep dwellers. However, we identify several species with systematic offsets in Mg/Ca values, to which multispecies calibrations should be applied with caution. We can track the appearance of such offsets through ancestor-descendent species over the last 15 Myr and propose that the emergence of these offsets may be the geochemical expression of evolutionary innovations. We find that virtually all of the Mg/Ca- and δ18O-derived temperatures from the commonly used genera Globigerinoides and Trilobatus are within uncertainty of each other, highlighting the utility of these species for paleoceanographic reconstructions. Our results highlight the potential of leveraging information from species lineages to improve sea surface temperature reconstruction from planktonic foraminifera over the Cenozoic.
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JiKo

Globally, 2 out of 5 pregnant women and young children are affected by anemia, a condition in which the number of red blood cells falls below normal.

This means less oxygen than normal is being delivered throughout the body.

Image of two children looking like lacking energy. Text: Lack of iron can cause fatigue, poor physical performance and less productivity at work and school
#WHO#Health#Anemia
Replied in thread
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Dendrobatus Azureus

@stefano

Blood The fuel of our Corpus
It's fascinating to know how Blood works, it's magnificent to see how Blood changes Colour when it's in contact with oxygen.

It's refreshing to read that you're in a country where the taxes are actually used for the people, something that my country still needs to work on
The taxes are simply used by the politicians for themselves, then they pay off certain things that they have to pay off and only when elections are close they take the time to patch up some roads, while road work is something that needs to go on 24/7, so over here taxes are not used in a proper manner by anyone who runs government.

It's also refreshing to see how other people think about blood in their own Corpus.

And what's overly wonderful to read is that you actively make sure that your body is in a proper condition

#Health#Sangre#Oxygen
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Warren Currie 🦠🦐

Weekend 🦠🦐
The most common on the planet was only discovered in 1986. Prochlorococcus is a genus of picoplankton (~½ micron) bacteria found in the Sargasso Sea by Penny Chisholm, Robert Olsen +, and eventually across all tropical oceans. It accounts for up to half the world's production. Recently, a relationship with heterotrophic was found, reinforcing its importance to the cycle.
phys.org/news/2025-01-abundant

image/jpeg a microscopic photograph of number of roughly spherical dark green organisms. A false color transmission electron microscope image of Prochlorococcus marinus Luke Thompson from Chisholm Lab and Nikki Watson from Whitehead, MIT CC0 1.0 Universal.
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arthurgessler

A long-term #drought reconstruction based on #oxygen #isotope tree ring data for central and eastern parts of Europe (Romania) bg.copernicus.org/articles/22/

bg.copernicus.orgA long-term drought reconstruction based on oxygen isotope tree ring data for central and eastern parts of Europe (Romania)Abstract. This study investigates the relationship between oxygen isotope ratios (δ18O) in oak tree ring cellulose and past drought variability in Letea Forest, Romania. A δ18O site chronology spanning 1803–2020 was compiled from seven individual time series. δ18O values exhibited a significant negative correlation with moisture-related variables (cloud cover, relative humidity, and precipitation) and a positive correlation with temperature and sunshine duration. This confirms that δ18O from tree rings can be a good proxy for moisture availability. The strongest correlation was found between δ18O and the August Standardized Precipitation Evapotranspiration Index for an accumulation period of 9 months (SPEI9) for central and eastern Europe. This highlights SPEI9 as a superior indicator of drought compared to individual parameters like temperature or precipitation. Using a linear regression model, we reconstructed August SPEI9 variability for the past 200 years. The reconstruction captured interannual and decadal variations, with distinct wet and dry periods. Analysis of large-scale atmospheric circulation patterns revealed a link between high δ18O values (indicating dry conditions) and a high-pressure system over the North Atlantic. Conversely, low δ18O values (indicating wet conditions) corresponded to negative pressure anomalies over Europe. Moreover, extreme values of δ18O are also associated with the prevalence of a hemispheric teleconnection pattern, namely wave number 4. This δ18O chronology and the corresponding August SPEI9 reconstruction offer valuable tools for understanding past climate variability and its relationship with large-scale atmospheric and oceanic circulation patterns.
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Brad Rosenheim

My take that no one asked for: we should be paying Brazilians more for the oxygen that their forests produce than for the steaks that they produce after cutting down the forests.

How much do we pay for oxygen? $0. Does that mean it is devoid of value? Of course not. It simply means that our markets are centered on absolutely the wrong things.

newsie.social/@allthebrazilian

#deforestation
#agriculture
#meat
#LandUseChange
#ecocide
#ClimateChange
#oxygen

NewsieAll The Brazilian Politics (@allthebrazilianpolitics@newsie.social)Brazil ends 2024 with record-breaking meat exports #politics #brazil #economy https://valorinternational.globo.com/agribusiness/news/2025/01/09/brazil-ends-2024-with-record-breaking-meat-exports.ghtml?utm_source=Twitter&utm_medium=Social&utm_campaign=compartilhar
Continued thread
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Mx Verda

Fellow asthma non-enjoyers:
Pls carry your inhaler. Please USE your inhaler.
PLEASE wear an FFP3 respirator, ideally reusable with filters.

Please GO TO A&E / CALL AN AMBULANCE if your reliever / rescue inhaler does not resolve your symptoms.

You WILL die one day.
You can postpone that day (and some disablement until then) with prompt action.

(Also, SEE YOUR GP after breathlessness or symptoms that are severe even to make you consider a hospital visit.
Your respiratory / chronic disease nurse needs to know.
You may benefit from a course of short-term steroids.)

youtube.com/watch?v=CyJwCTgK-j

YouTubeFree clean gone wrong!By Fife Free Cleaning
#asthma#asthmatic#breathing
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