A part of the system CaO-SiO2–Al2O3–Fe2O3–MgO which is of relevance to iron-ore sintering has been studied in detail. For a bulk composition corresponding to 10.45 wt% CaO, 5.49 wt% MgO, 69.15 wt% Fe2O3, 13.37 wt% Al2O3 and 1.55 wt% SiO2 synthesis runs have been performed in air in the range between 1100 and 1300°C. Products have been characterized using reflected-light microscopy, electron microprobe analysis and diffraction techniques. At 1250°C, an almost phase-pure material with composition Ca2.99Mg2.67Fe3+14.58Fe2+0.77Al4.56Si0.43O36 has been obtained. The compound corresponds to the first Si-containing representative of the M14+6nO20+8n polysomatic series of so-called SFCA phases (Silico-Ferrites of Calcium and Aluminum) with n = 2 and is denoted as SFCA-III. Single-crystal diffraction investigations using synchrotron radiation at the X06DA beamline of the Swiss Light Source revealed that the chemically homogenous sample contained both a triclinic and monoclinic polytype. Basic crystallographic data are as follows: triclinic form: a = 10.3279 (2) Å, b = 10.4340 (2) Å, c = 14.3794 (2) Å, α = 93.4888 (12)°, β = 107.3209 (14)° and γ = 109.6626 (14)°, V = 1370.49 (5) Å3, Z = 2, space group P{overline 1}; monoclinic form: a = 10.3277 (2) Å, b = 27.0134 (4) Å, c = 10.4344 (2) Å, β = 109.668 (2)°, V = 2741.22 (9) Å3, Z = 4, space group P21/n. Structure determination of both modifications was successful using diffraction data from the same allotwinned crystal. A description of the observed polytypism within the framework of OD-theory is presented. Triclinic and monoclinic SFCA-III actually correspond to the two possible maximum degree of order structures based on OD-layers containing three spinel (S) and one pyroxene (P) modules (〈S3P〉). The existence of SFCA-III in industrial iron-ore sinters has yet to be confirmed. Polytypism is likely to occur in other SFCA-members (SFCA, SFCA-I) relevant to sintering as well, but has so far been neglected in the characterization of industrial samples. Our results shed light on this phenomenon and may therefore be also helpful for better interpretation of the powder diffraction patterns that are used for phase analysis of iron-ore sinters.

Here, structural parameters of various structure reports on RSi2 and R2TSi3 compounds [where R is an alkaline earth metal, a rare earth metal (i.e. an element of the Sc group or a lathanide), or an actinide and T is a transition metal] are summarized. The parameters comprising composition, lattice parameters a and c, ratio c/a, formula unit per unit cell and structure type are tabulated. The relationships between the underlying structure types are presented within a group–subgroup scheme (Bärnighausen diagram). Additionally, unexpectedly missing compounds within the R2TSi3 compounds were examined with density functional theory and compounds that are promising candidates for synthesis are listed. Furthermore, a correlation was detected between the orthorhombic AlB2-like lattices of, for example, Ca2AgSi3 and the divalence of R and the monovalence of T. Finally, a potential tetragonal structure with ordered Si/T sites is proposed.

Convolutional neural networks are useful for classifying grazing-incidence small-angle X-ray scattering patterns. They are also useful for classifying real experimental data.

GIDVis is a software package based on MATLAB specialized for, but not limited to, the visualization and analysis of grazing-incidence thin-film X-ray diffraction data obtained during sample rotation around the surface normal. GIDVis allows the user to perform detector calibration, data stitching, intensity corrections, standard data evaluation (e.g. cuts and integrations along specific reciprocal-space directions), crystal phase analysis etc. To take full advantage of the measured data in the case of sample rotation, pole figures can easily be calculated from the experimental data for any value of the scattering angle covered. As an example, GIDVis is applied to phase analysis and the evaluation of the epitaxial alignment of pentacene­quinone crystallites on a single-crystalline Au(111) surface.

Grazing-incidence small-angle X-ray scattering (GISAXS) coupled with computed tomography (CT) has enabled the visualization of the spatial distribution of nanostructures in thin films. 2D GISAXS images are obtained by scanning along the direction perpendicular to the X-ray beam at each rotation angle. Because the intensities at the q positions contain nanostructural information, the reconstructed CT images individually represent the spatial distributions of this information (e.g. size, shape, surface, characteristic length). These images are reconstructed from the intensities acquired at angular intervals over 180°, but the total measurement time is prolonged. This increase in the radiation dosage can cause damage to the sample. One way to reduce the overall measurement time is to perform a scanning GISAXS measurement along the direction perpendicular to the X-ray beam with a limited interval angle. Using filtered back-projection (FBP), CT images are reconstructed from sinograms with limited interval angles from 3 to 48° (FBP-CT images). However, these images are blurred and have a low image quality. In this study, to optimize the CT image quality, total variation (TV) regularization is introduced to minimize sinogram image noise and artifacts. It is proposed that the TV method can be applied to downsampling of sinograms in order to improve the CT images in comparison with the FBP-CT images.

BornAgain is a free and open-source multi-platform software framework for simulating and fitting X-ray and neutron reflectometry, off-specular scattering, and grazing-incidence small-angle scattering (GISAS). This paper concentrates on GISAS. Support for reflectometry and off-specular scattering has been added more recently, is still under intense development and will be described in a later publication. BornAgain supports neutron polarization and magnetic scattering. Users can define sample and instrument models through Python scripting. A large subset of the functionality is also available through a graphical user interface. This paper describes the software in terms of the realized non-functional and functional requirements. The web site https://www.bornagainproject.org/ provides further documentation.

By using small-angle neutron scattering (SANS) reinforced by scanning electron microscopy, the fine structure of catalysts for polymer electrolyte fuel cells has been investigated. The experimental data resulting from contrast variation with mixed light and heavy water (H2O/D2O) are well described by a core–shell model with fluctuations in concentration between water and Nafion.

A software package for Grazing Incident Wide Angle X-ray Scattering (GIWAXS) geared toward weakly ordered materials, including: scattering intensity normalization/uncertainty, scattering pattern indexing, and refractive shift correction.

Most articles dealing with R2TSi3 compounds are only interested in one specific composite or in a series of composites with varying T elements while keeping R fixed (or vice versa). The present work gives an overview of the complete range of 2:1:3 silicides, similar those of Hoffmann & Pöttgen (2001) and Pan et al. (2013). In contrast to the work of Hoffmann & Pöttgen (2001), reasons for formation of the different symmetries and superstructures are discussed. Here, crystallographic properties are in[the] focus, whereas physical and magnetic properties are omitted because those are given by Pan et al. (2013). READS LIKE AN ABSTRACT, please re-write and remove references if possible. Should be two sentences max.

The title compound, C11H11NO5, has a nearly planar geometry. In the crystal, the molecules are assembled into chains parallel to the [overline{1}11] direction by O—H...O and C—H...O hydrogen bonds.

Insights were obtained into the structure of the 4-hydroxy-tetrahydrodipicolinate synthase from the thermoacidophilic methanotroph Methylacidiphilum fumariolicum SolV and the phylogeny of the aminotransferase pathway for the biosynthesis of lysine.

Already under siege from overfishing, disease and poor water quality, the oyster population in the Chesapeake Bay today stands at 2 percent of what it was in colonial times. Now, new data show that rising acidity in the Bay will have a negative impact on oyster shells.

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A recent experiment by scientists at the Smithsonian Tropical Research Institute in Panama has revealed just how rising atmospheric carbon dioxide will deliver a one-two […]

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A team of scientists from the Smithsonian Environmental Research Center in Edgewater, Md., is taking a closer look at how rising acidification of ocean water may be impacting estuaries and near shore environments on the Chesapeake Bay

The post Oysters on floating plates help scientists study acidification and shell growth appeared first on Smithsonian Insider.

Researchers from the Smithsonian Institution and the University of Florida have announced the discovery of a bone fragment, approximately 13,000 years old, in Florida with an incised image of a mammoth or mastodon.

The post Bone fragment is only Ice Age artwork from America to show a “proboscidean” appeared first on Smithsonian Insider.

Two studies appearing in the Aug. 25 issue of the journal Nature provide new insights into a cosmic accident that has been streaming X-rays toward Earth since late March. NASA's Swift satellite first alerted astronomers to intense and unusual high-energy flares from the new source in the constellation Draco.

The post Swift satellite alerts astronomers to cosmic accident in constellation Draco appeared first on Smithsonian Insider.

Fond of a range of marine and freshwater vegetation such as turtle grass and eelgrass, the Florida manatee spends most of its waking hours grazing […]

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If you were an average person in the 18th and early 19th centuries, chances are your wardrobe was 50 shades of beige, with maybe a […]

The post A Purple Accident and Its Vibrant Impact on the Modern World appeared first on Smithsonian Insider.

Higher acidity in coastal waters can make fish more sensitive to low oxygen, causing them to become debilitated and suffocate in water with oxygen levels […]

The post Acidification, Low Oxygen Can be Deadly Combination for Fish appeared first on Smithsonian Insider.

Crystal structure identification of thin organic films entails a number of technical and methodological challenges. In particular, if molecular crystals are epitaxially grown on single-crystalline substrates a complex scenario of multiple preferred orientations of the adsorbate, several symmetry-related in-plane alignments and the occurrence of unknown polymorphs is frequently observed. In theory, the parameters of the reduced unit cell and its orientation can simply be obtained from the matrix of three linearly independent reciprocal-space vectors. However, if the sample exhibits unit cells in various orientations and/or with different lattice parameters, it is necessary to assign all experimentally obtained reflections to their associated individual origin. In the present work, an effective algorithm is described to accomplish this task in order to determine the unit-cell parameters of complex systems comprising different orientations and polymorphs. This method is applied to a polycrystalline thin film of the conjugated organic material 6,13-pentacene­quinone (PQ) epitaxially grown on an Ag(111) surface. All reciprocal vectors can be allocated to unit cells of the same lattice constants but grown in various orientations [sixfold rotational symmetry for the contact planes (102) and (102)]. The as-determined unit cell is identical to that reported in a previous study determined for a fibre-textured PQ film. Preliminary results further indicate that the algorithm is especially effective in analysing epitaxially grown crystallites not only for various orientations, but also if different polymorphs are present in the film.

Smithsonian staff gathered on Thursday, June 1 outside the National Museum of African American History and Culture to show their support and listen to Director […]

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Smithsonian Tropical Research Institute MarineGEO Postdoctoral Fellow Maggie Johnnson outlines her research studying the effects of ocean acidification on marine coral near Bocas del Toro, […]

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These opportunistic plants quickly fill-in the gap taking advantage of the increased light coming through the tree canopy and the fresh soil at the fallen tree’s turned-up roots.

The post Falling trees help invasive wineberry move into deciduous forests in North America appeared first on Smithsonian Insider.

The crystal structures of caesium di­hydrogen arsenate(V) bis­[tri­hydrogen arsen­ate(V)], Cs(H2AsO4)(H3AsO4)2, ammonium di­hydrogen arsenate(V) tri­hydrogen arsenate(V), NH4(H2AsO4)(H3AsO4), and dilithium bis­(di­hydrogen phosphate), Li2(H2PO4)2, were solved from single-crystal X-ray diffraction data. NH4(H2AsO4)(H3AsO4), which was hydro­thermally synthesized (T = 493 K), is homeotypic with Rb(H2AsO4)(H3AsO4), while Cs(H2AsO4)(H3AsO4)2 crystallizes in a novel structure type and Li2(H2PO4)2 represents a new polymorph of this composition. The Cs and Li compounds grew at room temperature from highly acidic aqueous solutions. Li2(H2PO4)2 forms a three-dimensional (3D) framework of PO4 tetra­hedra sharing corners with Li2O6 dimers built of edge-sharing LiO4 groups, which is reinforced by hydrogen bonds. The two arsenate compounds are characterized by a 3D network of AsO4 groups that are connected solely via multiple strong hydrogen bonds. A statistical evaluation of the As—O bond lengths in singly, doubly and triply protonated AsO4 groups gave average values of 1.70 (2) Å for 199 As—OH bonds, 1.728 (19) Å for As—OH bonds in HAsO4 groups, 1.714 (12) Å for As—OH bonds in H2AsO4 groups and 1.694 (16) Å for As—OH bonds in H3AsO4 groups, and a grand mean value of 1.667 (18) Å for As—O bonds to nonprotonated O atoms.

A method is described for indexing grazing-incidence X-ray diffraction data of epitaxially grown thin films comprising various crystal orientations and/or polymorphs by measuring reciprocal-lattice vectors.

Evidence exists linking three cancers and two other health problems with chemicals used in herbicides in the Vietnam War, a committee of the Institute of Medicine (IOM) has concluded.

No justification currently exists for completely abandoning chemical pesticides, says a new report from the National Academies National Research Council.

The 2011 Fukushima Daiichi nuclear accident should serve as a wake-up call to nuclear plant operators and regulators on the critical importance of measuring, maintaining, and restoring cooling in spent fuel pools during severe accidents and terrorist attacks, says a new report from the National Academies of Sciences, Engineering, and Medicine.

In response to alarming evidence of high rates of depression and suicide among U.S. health care workers, the National Academy of Medicine is launching a wide-ranging “action collaborative” of multiple organizations to promote clinician well-being and resilience.

Two years after it released the first season of the show 13 Reasons Why with a graphic suicide scene, Netflix has announced that it has edited it out.

The show is centered on the suicide of fictional teen Hannah Baker, and the first season's finale shows her taking her own life. Several organizations, including the National Association of School Psychologists, raised concerns that it could romanticize suicide for vulnerable teens.

"Our creative intent in portraying the ugly, painful reality of suicide in such graphic detail in Season 1 was to tell the truth about the horror of such an act, and make sure no one would ever wish to emulate it," show creator Brian Yorkey said in a statement. "But as we ready to launch Season 3, we have heard concerns about the scene from Dr. Christine Moutier at the American Foundation for Suicide Prevention and others, and have agreed with Netflix to re-edit it."

"No one scene is more important than the life of the show, and its message that we must take better care of each other," he added. "We believe this edit will help the show do the most good for the most people while mitigating any risk for especially vulnerable young viewers."

After some initial criticism, Netflix added a warning card to the beginning of the episode, alerting viewers that the episode contained "graphic depictions of suicide and violence."

The show also has a website, 13reasonswhy.info, containing resources about suicide prevention. It contains videos of cast members discussing topics such as bullying, consent, depression and how to talk with a teen about the series. The site also warns: "If you are struggling, this series may not be right for you or you may want to watch it with a trusted adult."

The edited version, now on Netflix, shows Hannah looking at herself in the mirror, full of emotion. It then cuts to her parents finding her body in the bathroom and reacting to her death. The previous version was nearly three minutes long, according to The Hollywood Reporter, and showed her cutting her wrists with a razor blade.

Netflix's decision has drawn praise from a number of suicide prevention advocates, such as American Association of Suicidology, American Foundation for Suicide Prevention, American School Counselor Association, Dr. Helen Hsu from Stanford, advocacy group Mental Health America, the Trevor Project and Dr. Rebecca Hedrick from Cedars-Sinai, according to THR.

"We support the decision to edit the scene in which Hannah takes her own life from 13 Reasons Why. There has been much debate about the series in the medical community," they said in a joint statement, as THR reported. "But this positive change will ensure that 13 Reasons Why continues to encourage open conversation about mental health and suicide prevention — while also mitigating the risk for the most vulnerable teenage viewers."

Ron Avi Astor at the University of Southern California, who studies adolescent bullying and mental health, discussed with NPR's Anya Kamenetz how the images of self-harm on the show could affect teens.

Avi Astor told Kamenetz that the depiction could be contagious — but just for certain teens. "It's not just that any random kid would see it and do it," he said, but for a kid who was already thinking about suicide, it had the potential to influence their behavior.

If you or someone you know may be considering suicide, contact the National Suicide Prevention Lifeline at 1-800-273-8255 (En Español: 1-888-628-9454; Deaf and Hard of Hearing: 1-800-799-4889) or the Crisis Text Line by texting HOME to 741741.

This content is from Southern California Public Radio. View the original story at SCPR.org.

Opera singer Plácido Domingo, shown here speaking in Spain last July, said earlier this month that he tested positive for the coronavirus.; Credit: Ricardo Rubio/Europa Press via Getty Images

Plácido Domingo has been hospitalized because of COVID-19-related complications, according to multiple reports.

He is in stable condition in an Acapulco, Mexico, hospital and will receive medical attention for "as long as the doctors find it necessary until a hoped-for full recovery," a spokesperson for Domingo told Opera News over the weekend.

Domingo's reported hospitalization comes just days after he posted a March 22 message on Facebook revealing that he had tested positive for the disease caused by the coronavirus.

"I feel it is my moral duty to announce that I tested positive for COVID19, also known as the Corona Virus. My family and I are and will remain individually isolated for as long as it is medically necessary. Today we all enjoyed good health, but I presented symptoms of coughing and fever, so I decided to take the test and the result was positive," Domingo said.

Domingo has been one of opera's most reliable and bankable stars and is known for his ability to sing tenor and baritone and in multiple languages, including Italian, English, Russian and Spanish.

Recently, the 79-year-old has been embroiled in controversy as several women accused the Spanish-born singer of sexual misconduct.

On March 10, NPR reported that LA Opera, which Domingo helped establish, announced that its investigation substantiated 10 "inappropriate conduct" claims levied against him dating back to as early as 1986. Domingo resigned as the LA Opera's general director in October.

Prior to that, he withdrew from a production of the Metropolitan Opera's performance of "Macbeth" amid allegations of sexual misconduct.

He has denied the allegations.

Domingo is among a growing list of celebrities who have announced they have tested positive for the coronavirus, including actor Tom Hanks and his wife Rita Wilson, actor Idris Elba, NBA star Kevin Durant, talk show host Andy Cohen and British Prime Minister Boris Johnson.

This content is from Southern California Public Radio. View the original story at SCPR.org.

The Asian Garden Mall in Westminster, where voters will make a choice about whether to recall city leaders.; Credit: Dorian Merina/KPCC

Voters in Westminster will decide this spring whether to recall its mayor and two city councilmembers. The Orange County Registrar of Voters has signed off on petitions for a recall election.  

This content is from Southern California Public Radio. View the original story at SCPR.org.

David Rolf, International Vice President of the Service Employees International Union, stands in his downtown Seattle office. Rolf led the campaign to bring a $15 minimum wage to Seatac, Washington in 2013.; Credit: Ben Bergman/KPCC

As Los Angeles mulls a law that would raise the minimum wage above the current California minimum of $9 an hour, it's the latest city to jump on a trend that started as the by-product of a failed labor negotiation in the state of Washington.

The first city to enact a $15-per-hour minimum wage was SeaTac, Wash., — a tiny airport town outside Seattle. "SeaTac will be viewed someday as the vanguard, as the place where the fight started," the lead organizer of SeaTac's $15 campaign, David Rolf, told supporters in November 2013 after a ballot measure there barely passed.

Rolf never set out to raise SeaTac’s minimum wage, much less start a national movement. Speaking from a sparse corner office in downtown Seattle at the Service Employees International Union 775, which he founded in 2002, Rolf told KPCC that his original goal in 2010 was to unionize workers at SeaTac airport.

When employers – led by Alaska Airlines — played hardball, Rolf put the $15 minimum wage on the ballot as leverage. “We had some polling in SeaTac that it could pass, but it was not at all definitive,” Rolf said.

That proved prescient: In a city of just 12,108 registered voters, Rolf's staff signed up around 1,000 new voters, many of them immigrants who had never cast a ballot. The measure won by just 77 votes.

It's an irony that the new law doesn't apply to workers at the center of the minimum wage campaign: The airport workers at SeaTac. That's because the Port of Seattle, which oversees the airport, challenged the initiative, arguing that the city's new minimum wage should not apply to the nearly 5,000 workers at the airport. A county judge agreed. Supporters of the $15 wage have appealed.

Still, Rolf said, "I think people are proud that that’s what happening. There are leaders of the movement in Seattle, including our mayor, that said shortly after the victory, 'Now we have to take it everywhere else.'"

The $15 minimum wage spread to Seattle last June and to San Francisco in November. 

Why $15 an hour?

The $15 figure first came to people’s attention in a series of strikes by fast food workers that started two years ago in New York. 

“I think it’s aspirational, and it provides a clean and easy-to-understand number," Rolf said. "You can debate whether it ought to really be $14.89 or $17.12, and based upon the cost of living in different cities, you could have a different answer. But in the late 19th and early 20th century, American workers didn’t rally for 7.9 or 8.1 hour working day. They rallied for an eight-hour day.”

“What’s really remarkable about social protest movements in American history is that the radical ideas of one group are often the common sense ideas of another group in a matter of a few years," said Peter Dreier, professor of politics at Occidental College.

Rolf is hopeful the $15 minimum wage can spread to every state. But Nelson Lichtenstein, Director of the Center for the Study of Work, Labor and Democracy at the University of California, Santa Barbara, is skeptical.

“I don’t think having high wages in a few cities will mean it will spread to red state America,” he said. 

Lichtenstein said cities like L.A. have become more labor friendly, thanks largely to an influx of immigrants, but that’s not the case in the South. Oklahoma recently banned any city from setting its own minimum wage, joining at least 12 other states with similar laws, according to Paul Sonn, general counsel and program director at the National Employment Law Project.

In November, voters in four Republican-leaning states — Alaska, Arkansas, South Dakota, and Nebraska — approved higher minimum wages, but they weren’t close to $15.

A $15 dollar wage would have a much greater impact in Los Angeles than Seattle or San Francisco because the average income here is much lower than in those cities. Post-recession, income inequality has become much more of a concern for voters, which has made $15 more palatable, Sonn said.

This fall, the Los Angeles City Council enacted a $15.37 minimum wage for hotel workers that takes effect next year. A similar law has been in effect around LAX since 2007. 

But even though California cities have been allowed to set their own minimum wages for more than a decade, L.A. has never come close to doing so.

Until now.

This content is from Southern California Public Radio. View the original story at SCPR.org.

My new book LOSERTHINK, available now on Amazon https://tinyurl.com/rqmjc2a Content: Watching Anderson Cooper CNN is like being on mushrooms Why state governments are best for reopening decisions Disbanding the task force, it’s time Moonface Ben Shapiro’s clear description of coronavirus situation If you would like my channel to have a wider audience and higher production […]

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My new book LOSERTHINK, available now on Amazon https://tinyurl.com/rqmjc2a Content: The Plague of Corruption video General Flynn San Antonio makes phrase “Chinese virus” hate speech Vitamin D deficiency and coronavirus Testing, flattening the curve, magical thinking If you would like to enjoy this same content plus bonus content from Scott Adams, including micro-lessons on lots […]

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Researchers have found that ocean acidification leads to changes in the ways that clownfish normally respond to sound. As many species rely on hearing for orientation, habitat selection, avoiding predators and communication, ocean acidification could compromise auditory behaviour crucial for survival.

Mediterranean red coral (Corallium rubrum), already endangered due to over-harvesting, is likely to suffer still further under increasing ocean acidification as a result of rising CO2 emissions. Research has shown that under more acidic conditions the structural development of red coral skeletons is abnormal and growth rate is reduced.

A new study from Denmark has indicated that a substantial proportion of farmers may place professional values above cost savings when making decisions about how much pesticide to use. This implies that agricultural policy should consider a broad array of policy instruments to reduce pesticide usage.

Underground water aquifers are a significant source of drinking water. In a recent study, French researchers found that pesticides applied to crops can take many years to sink down through the ground and reach groundwater. This means that they may still be entering aquifers, even after agricultural application has stopped.

The use of herbicides on crops causes environmental concerns. A new French study assesses the performance of cropping systems to manage weeds and finds that these techniques could control arable weeds in the long-term and reduce reliance on herbicides.

Organic pesticides may not always be the most environmentally-friendly choice of pest control, according to recent research. Two new synthetic pesticides for controlling aphids were found to be less harmful to other species and more efficient than the two new organic pesticides tested in the study.

A recent study has compared the chemical environmental impacts of using the weed controller glyphosate on glyphosate-tolerant (GT) crops, with the use of other herbicides on non-GT crops. Glyphosate used on GT crops had lower environmental impacts than herbicides used on non-GT crops, but the persistence of AMPA (a break-down product of glyphosate) in soils could be a problem in the future.

Biochar is increasingly mixed into farm soils to improve crop productivity and maintain carbon stocks. However, it can change the way that pesticides applied to the same soil behave, according to a new study. The researchers suggest that farmers may also need to follow new guidelines on pesticide application if they add biochar to their soil.

Coral and mollusc species with an outer layer of protective tissue are more able to withstand acidic seawater than some other species, according to a recent study. However, higher temperatures projected under climate change are likely to worsen the impact of ocean acidification on coral and molluscs, even affecting those that are otherwise resistant to higher levels of acidity.

Coral reef formation is already decreasing worldwide. A new study predicts that formation will drop to 60% of its natural rate if anthropogenic CO2 emissions continue to rise over the next century and keep acidifying the oceans.

Researchers have found that ocean acidification leads to changes in the ways that clownfish normally respond to sound. As many species rely on hearing for orientation, habitat selection, avoiding predators and communication, ocean acidification could compromise auditory behaviour crucial for survival.

Ocean acidification may affect sharks’ sense of smell, causing them to avoid food, reports new research. In lab tests, the study found that sharks exhibited less feeding behaviour when they were kept in tanks of acidified seawater. These changes could pose a risk to the health of sharks, with knock-on effects for whole marine ecosystems.

Ocean acidification could damage the organs of Atlantic herring, as well as slow their growth and development, recent experiments show. It adds to the list of pressures currently threatening this commercially important species, including over-fishing and marine pollution.