A tailor-made molecule that ties nerve connections

From Phys.Org:

The human brain’s neuronal network undergoes lifelong changes in order to be able to assimilate information and store it in a suitable manner. This applies in particular to the generation and recall of memories. So-called synapses play a central role in the brain’s ability to adapt. They are junctions through which nerve signals are passed from one cell to the next. A number of specific molecules known as synaptic organizing proteins ensure that synapses are formed and reconfigured whenever necessary.

An artificial protein

An international team of researchers has now combined structural elements of such naturally occurring molecules into an artificial protein called CPTX and tested its effect in disease models. To this end, the compound was administered to mice with neurological deficits analogous to human afflictions. Specifically, the tests focused on Alzheimer’s disease, spinal cord injury and cerebellar ataxia—a disease that is characterized primarily by a failure of muscle coordination. All these conditions are associated with damage to the synapses or their loss. The study was a collaborative effort by experts from several research institutions, including the DZNE’s Magdeburg site, MRC Laboratory of Molecular Biology in UK, Keio University School of Medicine in Tokyo, and, also in Japan, Aichi Medical University.

Easing symptoms of disease

“In our lab we studied the effect of CPTX on mice that exhibited certain symptoms of Alzheimer’s disease,” said Prof. Alexander Dityatev, a senior researcher at the DZNE, who has been investigating synaptic proteins for many years. “We found that application of CPTX improved the mice’s memory performance.” The researchers also observed normalization of several important neuronal parameters that are compromised in Alzheimer’s disease, as well as in the studied animal model. Namely, CPTX increased the ability of synapses to change, which is considered as a cellular process associated with memory formation. Furthermore, CPTX was shown to elevate what is called “excitatory transmission.” This is to say that the protein acted specifically on synapses that promoted activity of the contacted cell. And finally, CPTX increased the density of so-called dendritic spines. These are tiny bulges in the cell’s membrane that are essential for establishing excitatory synaptic connections.

More here.

Thursday, August 27, 2020

Long-Haulers Are Redefining COVID-19

Ed Yong in The Atlantic:

Lauren Nichols has been sick with COVID-19 since March 10, shortly before Tom Hanks announced his diagnosis and the NBA temporarily canceled its season. She has lived through one month of hand tremors, three of fever, and four of night sweats. When we spoke on day 150, she was on her fifth month of gastrointestinal problems and severe morning nausea. She still has extreme fatigue, bulging veins, excessive bruising, an erratic heartbeat, short-term memory loss, gynecological problems, sensitivity to light and sounds, and brain fog. Even writing an email can be hard, she told me, “because the words I think I’m writing are not the words coming out.” She wakes up gasping for air twice a month. It still hurts to inhale.

Tens of thousands of people, collectively known as “long-haulers,” have similar stories. I first wrote about them in early June. Since then, I’ve received hundreds of messages from people who have been suffering for months—alone, unheard, and pummeled by unrelenting and unpredictable symptoms. “It’s like every day, you reach your hand into a bucket of symptoms, throw some on the table, and say, ‘This is you for today,’” says David Putrino, a neuroscientist and a rehabilitation specialist at Mount Sinai Hospital who has cared for many long-haulers.

More here.

Blockchain, the amazing solution for almost nothing

Jesse Frederik in The Correspondent:

I’ve been hearing a lot about blockchain in the last few years. I mean, who hasn’t? It’s everywhere.

I’m sure I wasn’t the only one who thought: but what is it then, for God’s sake, this whole blockchain thing? And what’s so terribly revolutionary about it? What problem does it solve?

That’s why I wrote this article. I can tell you upfront, it’s a bizarre journey to nowhere. I’ve never seen so much incomprehensible jargon to describe so little. I’ve never seen so much bloated bombast fall so flat on closer inspection. And I’ve never seen so many people searching so hard for a problem to go with their solution.

More here.

Jacques Rivette on Out 1 and Céline and Julie Go Boating

Carlos Clarens and Edgardo Cozarinsky interview Jazques Rivette at Sight and Sound:

JACQUES RIVETTE: When I began making films my point of view was that of a cinephile, so my ideas about what I wanted to do were abstract. Then, after the experience of my first two films, I realised I had taken the wrong direction as regards methods of shooting. The cinema of mise en scène, where everything is carefully preplanned and where you try to ensure that what is seen on the screen corresponds as closely as possible to your original plan, was not a method in which I felt at ease or worked well. What bothered me from the outset, after I had finally managed to finish Paris Nous Appartient with all its tribulations, was what the characters said, the words they used. I had written the dialogue beforehand with my co-writer Jean Gruault (though I was 90 per cent responsible) and then it was reworked and pruned during shooting, as the film otherwise would have run four-and-a-half hours. The actors sometimes changed a word here and there, as always happens in films, but basically the dialogue was what I had written – and I found it a source of intense embarrassment. So much so that when I began work on La Religieuse, which was a project that took quite a while to get off the ground, I determined this time to use what was basically a pre-existing text.

more here.

The dizzying ‘Celine and Julie Go Boating’

Philippa Snow at The New Statesman:

“[Jacques Rivette’s] whole movie, like a dream, is set between quotation marks,” Gilbert Adair suggested in Film Comment in 1974. “Like a dream, it is an anagram of reality.” The simplest way to explain the film – if there is a simple way to explain it – is that at some point Celine enters a ­remote mansion on the outskirts of the city, loses track of time, and ends up thrown back into daylight after an unspecified number of hours. She is dazed, and has no memory of what occurred inside the house, but feels compelled to keep returning.

Julie, keen to solve the puzzle, does the same. After each visit, they emerge with a mysterious piece of candy in their mouths; eventually, it becomes clear that the key to remembering what has transpired is ­consuming this strange sweet, allowing them to experience a shared hallucination that takes on the shape of a Victorian  murder mystery.

more here.

Lynching and Liberalism

Paul Berman in Tablet:

The larger question lurking behind the debate over “cancel culture” is the one about liberalism—to wit, what is liberalism, anyway? And why should we care about it? I signed the Harper’s “Letter on Justice and Open Debate” last month because it beams a clarifying spotlight on the cancel phenomenon, and on its progressive or left-wing version, in particular: “an intolerance of opposing views, a vogue for public shaming and ostracism, and the tendency to dissolve complex policy issues in a blinding moral certainty.” But I signed also because, in the course of making its point, the Harper’s letter scatters a few additional illuminations on the larger background question, as well. It is a nuanced letter. Its tone seems to me agreeably old school, recognizable from liberal debates and manifestos of long ago—which, to be sure, the letter’s detractors may regard as one more reason for dismissing the debate and the document and the signatories and their worries. But sometimes it is good to be reminded of times gone by.

Cancel culture is a new name, but the ideological coercions of an overheated left are not, after all, a new problem. They have a history, and, by my reckoning, they even have an origin, which goes back to the 1920s.

More here.

What Near-Death Experiences Reveal about the Brain

Christof Koch in Scientific American:

A young Ernest Hemingway, badly injured by an exploding shell on a World War I battlefield, wrote in a letter home that “dying is a very simple thing. I’ve looked at death, and really I know. If I should have died it would have been very easy for me. Quite the easiest thing I ever did.” Years later Hemingway adapted his own experience—that of the soul leaving the body, taking flight and then returning—for his famous short story “The Snows of Kilimanjaro,” about an African safari gone disastrously wrong. The protagonist, stricken by gangrene, knows he is dying. Suddenly, his pain vanishes, and Compie, a bush pilot, arrives to rescue him. The two take off and fly together through a storm with rain so thick “it seemed like flying through a waterfall” until the plane emerges into the light: before them, “unbelievably white in the sun, was the square top of Kilimanjaro. And then he knew that there was where he was going.” The description embraces elements of a classic near-death experience: the darkness, the cessation of pain, the emerging into the light and then a feeling of peacefulness.

Near-death experiences, or NDEs, are triggered during singular life-threatening episodes when the body is injured by blunt trauma, a heart attack, asphyxia, shock, and so on. About one in 10 patients with cardiac arrest in a hospital setting undergoes such an episode. Thousands of survivors of these harrowing touch-and-go situations tell of leaving their damaged bodies behind and encountering a realm beyond everyday existence, unconstrained by the usual boundaries of space and time. These powerful, mystical experiences can lead to permanent transformation of their lives.

…Why the mind should experience the struggle to sustain its operations in the face of loss of blood flow and oxygen as positive and blissful rather than as panic-inducing remains mysterious. It is intriguing, though, that the outer limit of the spectrum of human experience encompasses other occasions in which reduced oxygen causes pleasurable feelings of jauntiness, light-headedness and heightened arousal—deepwater diving, high-altitude climbing, flying, the choking or fainting game, and sexual asphyxiation. Perhaps such ecstatic experiences are common to many forms of death as long as the mind remains lucid and is not dulled by opiates or other drugs given to alleviate pain. The mind, chained to a dying body, visits its own private version of heaven or hell before entering Hamlet’s “undiscovered country from whose bourn no traveler returns.”

More here.

The bold plan that could save South Africa’s leopards

Heather Richardson in BBC:

A grimace revealing powerful yellow incisors clearly indicated we were too close. As our game drive vehicle gently reversed, the female leopard, Thandi, relaxed and settled back in the thicket with her seven-month-old cub, panting as she digested her latest kill. An impala carcass hung limply in the branches nearby. Leopards are famously elusive – but here in the private Sabi Sands Game Reserve, on the edge of Kruger National Park in South Africa, these cats are so habituated to human presence, they’re commonly seen strolling nonchalantly past vehicles of tourists, unconcerned by the frantic clicking of cameras. Though their presence in the Sabi Sands might suggest otherwise, South Africa’s leopard population faces an uncertain future. In a country where reserves and national parks are surrounded by farms, roads and developments, leopards have been forced into ever smaller areas. In some populations, as one recent paper shows, this has led to inbreeding – something that can have long-lasting, catastrophic effects, impacting the cats’ resistance to illnesses and climate events like droughts, and even resulting in local extinction.

“You’re looking at anything between 70 to 100 years to recover any kind of diversity,” says the paper’s lead author, Vincent Naude, a PhD candidate at the University of Cape Town. In the face of global development, how can conservationists protect species like leopards that require room to roam, but are increasingly meeting barriers, from busy roads to conflicts with farmers?

More here.

Wednesday, August 26, 2020

A Review of “Pricks in the Tapestry” by Jameson Fitzpatrick

Daniel Felsenthal in The Believer:

HIV infects the body through a protein on the surface of white blood cells. A tiny percentage of people have no functional receptors for this protein, meaning they can have sex with whomever they want and never risk contracting the virus. Other people, like the poet Jameson Fitzpatrick’s uncle, have fewer working receptors, so HIV is harder for them to contract, develops more slowly, and leads to less abundant viral loads. “Roughly,” about his uncle, is the longest poem in Fitzpatrick’s new collection Pricks in the Tapestry, a book that often views queer cultural inheritance in the 21st century from the vantage of past generations.

In “Roughly,” Fitzpatrick, who was born in 1990, stares across the Millenial-Boomer divide with bifocals on. A speaker modeled on the poet tells the narrative of his late uncle’s life, while another speaker based on Fitzpatrick’s mother offers her own account in the form of footnotes. Spanning nearly twenty pages of mostly unbroken lines, the poem asks the reader which voice has better access to the reality of a man who was born in 1955, ran away as a teenager, likely worked as a rent boy, turned a chaotic youth into a stable adulthood, and ultimately died of AIDS.

More here.

COVID-19 Is Transmitted Through Aerosols: We Have Enough Evidence, Now It Is Time to Act

Jose-Luis Jimenez in Time:

Many months into the COVID-19 pandemic, the coronavirus is still spreading uncontrolled through the U.S. Public health authorities including the U.S. Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO) tell us to remain six feet apart, wash our hands, disinfect frequently touched surfaces, and wear masks. But compliance with these measures—especially masks—is mixed, and daily we hear of cases where people do not know how they were infected. We hear about superspreading events, where one person infects many, happening in crowded bars and family gatherings, but not at outdoor demonstrations. Beaches in cities like Chicago are closed, but gyms and indoor dining at restaurants have reopened. It is no wonder the public is confused.

It is critical to have a clear physical description of the ways in which COVID-19 is transmitted, so that individuals and institutions are able to visualize it and will understand how to protect themselves. Contrary to public health messaging, I, together with many other scientists, believe that a substantial share of COVID-19 cases are the result of transmission through aerosols. The evidence in favor of aerosols is stronger than that for any other pathway, and officials need to be more aggressive in expressing this reality if we want to get the pandemic under control.

More here.

If you’re so smart, why aren’t you rich? Turns out it’s just chance

From a couple of years ago in MIT Technology Review:

The distribution of wealth follows a well-known pattern sometimes called an 80:20 rule: 80 percent of the wealth is owned by 20 percent of the people. Indeed, a report last year concluded that just eight men had a total wealth equivalent to that of the world’s poorest 3.8 billion people.

This seems to occur in all societies at all scales. It is a well-studied pattern called a power law that crops up in a wide range of social phenomena. But the distribution of wealth is among the most controversial because of the issues it raises about fairness and merit. Why should so few people have so much wealth?

The conventional answer is that we live in a meritocracy in which people are rewarded for their talent, intelligence, effort, and so on. Over time, many people think, this translates into the wealth distribution that we observe, although a healthy dose of luck can play a role.

But there is a problem with this idea: while wealth distribution follows a power law, the distribution of human skills generally follows a normal distribution that is symmetric about an average value. For example, intelligence, as measured by IQ tests, follows this pattern. Average IQ is 100, but nobody has an IQ of 1,000 or 10,000.

More here.

Stop Defending The Humanities!

Simon During at Public Books:

The key consequence of seeing the humanities as a world alongside other broadly similar worlds is that the limits of their defensibility becomes apparent, and sermonizing over them becomes harder. If people stopped watching and playing sports, how much would it matter? The question is unanswerable since we can’t imagine a society continuous with ours but lacking sports, even though one such is, I suppose, possible. We do not have the means to adjudicate between that imaginary sportless society and our own actual sports-obsessed society. The same is true for the humanities. If the humanities were to disappear, new social and cultural configurations would then exist. Would this be a loss or gain? There is no way of telling, partly because we can’t picture what a society and culture that follow from ours but lack the humanities would be like at the requisite level of detail, and partly because, even if we could imagine such a society, our judgment between a society with the humanities and one without them couldn’t appeal to the standards like ours that are embedded in the humanities themselves. The humanities would be gone: that’s it.

more here.

The Tragic Charisma of Justin Townes Earle

Amanda Petrusich at The New Yorker:

One of my favorite Earle performances is an acoustic cover of Paul Simon’s “Graceland,” which he recorded in 2017 for Hamburger Küchensessions, a German series in which musicians perform from the corner of a kitchen. Take a breath before you watch it. His eyes are fluttering, and he appears unshaven, a little jittery. But his voice is beautiful—fragile and strong. “Graceland” is a kind of American hymn, a song about tragedy and heartache and also the part of a person’s spirit that tells them to keep going anyway, always—to atone and reclaim, as many times as it takes. Earle speeds the song up, and doesn’t quite cling to the melody or the lyrics as Simon wrote them, but his rendition is heavy, spare, and stunning. “I’m going to Graceland,” he promises, over and over as the song ends. It feels good to think that he is there right now, received and at peace.

more here.

History Will Judge the Complicit

Anne Applebaum in The Atlantic:

Here is another pair of stories, one that will be more familiar to American readers. Let’s begin this one in the 1980s, when a young Lindsey Graham first served with the Judge Advocate General’s Corps—the military legal service—in the U.S. Air Force. During some of that time, Graham was based in what was then West Germany, on the cutting edge of America’s Cold War efforts. Graham, born and raised in a small town in South Carolina, was devoted to the military: After both of his parents died when he was in his 20s, he got himself and his younger sister through college with the help of an ROTC stipend and then an Air Force salary. He stayed in the Reserves for two decades, even while in the Senate, sometimes journeying to Iraq or Afghanistan to serve as a short-term reserve officer. “The Air Force has been one of the best things that has ever happened to me,” he said in 2015. “It gave me a purpose bigger than myself. It put me in the company of patriots.” Through most of his years in the Senate, Graham, alongside his close friend John McCain, was a spokesperson for a strong military, and for a vision of America as a democratic leader abroad. He also supported a vigorous notion of democracy at home. In his 2014 reelection campaign, he ran as a maverick and a centrist, telling The Atlantic that jousting with the Tea Party was “more fun than any time I’ve been in politics.”

While Graham was doing his tour in West Germany, Mitt Romney became a co-founder and then the president of Bain Capital, a private-equity investment firm. Born in Michigan, Romney worked in Massachusetts during his years at Bain, but he also kept, thanks to his Mormon faith, close ties to Utah. While Graham was a military lawyer, drawing military pay, Romney was acquiring companies, restructuring them, and then selling them. This was a job he excelled at—in 1990, he was asked to run the parent firm, Bain & Company—and in the course of doing so he became very rich. Still, Romney dreamed of a political career, and in 1994 he ran for the Senate in Massachusetts, after changing his political affiliation from independent to Republican. He lost, but in 2002 he ran for governor of Massachusetts as a nonpartisan moderate, and won. In 2007—after a gubernatorial term during which he successfully brought in a form of near-universal health care that became a model for Barack Obama’s Affordable Care Act—he staged his first run for president. After losing the 2008 Republican primary, he won the party’s nomination in 2012, and then lost the general election.

Both Graham and Romney had presidential ambitions; Graham staged his own short-lived presidential campaign in 2015 (justified on the grounds that “the world is falling apart”). Both men were loyal members of the Republican Party, skeptical of the party’s radical and conspiratorial fringe. Both men reacted to the presidential candidacy of Donald Trump with real anger, and no wonder: In different ways, Trump’s values undermined their own. Graham had dedicated his career to an idea of U.S. leadership around the world—whereas Trump was offering an “America First” doctrine that would turn out to mean “me and my friends first.”

More here.

The Bias in the Machine

Sydney Perkowitz in Nautilus:

In January, Robert Williams, an African-American man, was wrongfully arrested due to an inaccurate facial recognition algorithm, a computerized approach that analyzes human faces and identifies them by comparison to database images of known people. He was handcuffed and arrested in front of his family by Detroit police without being told why, then jailed overnight after the police took mugshots, fingerprints, and a DNA sample. The next day, detectives showed Williams a surveillance video image of an African-American man standing in a store that sells watches. It immediately became clear that he was not Williams. Detailing his arrest in the Washington Post, Williams wrote, “The cops looked at each other. I heard one say that ‘the computer must have gotten it wrong.’” Williams learned that in investigating a theft from the store, a facial recognition system had tagged his driver’s license photo as matching the surveillance image. But the next steps, where investigators first confirm the match, then seek more evidence for an arrest, were poorly done and Williams was brought in. He had to spend 30 hours in jail and post a $1,000 bond before he was freed.

What makes the Williams arrest unique is that it received public attention, reports the American Civil Liberties Union.1 With over 4,000 police departments using facial recognition, it is virtually certain that other people have been wrongly implicated in crimes. In 2019, Amara Majeed, a Brown University student, was falsely identified by facial recognition as a suspect in a terrorist bombing in Sri Lanka. Sri Lankan police retracted the mistake, but not before Majeed received death threats. Even if a person goes free, his or her personal data remains listed among criminal records unless special steps are taken to expunge it.

More here.