Category: Top Posts

Why Felines Can’t Resist the #CatSquare

By Nicholas Dodman, Tufts University | April 18, 2017 12:40 pm
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Next best thing to a hidey-hole box? (Credit: Maggie Villiger, CC BY-ND)

Twitter’s been on fire with people amazed by cats that seem compelled to park themselves in squares of tape marked out on the floor. These felines appear powerless to resist the call of the #CatSquare. The Conversation

This social media fascination is a variation on a question I heard over and over as a panelist on Animal Planet’s “America’s Cutest Pets” series. I was asked to watch video after video of cats climbing into cardboard boxes, suitcases, sinks, plastic storage bins, cupboards and even wide-necked flower vases.

“That’s so cute … but why do you think she does that?” was always the question. It was as if each climbing or squeezing incident had a completely different explanation.

It did not. It’s just a fact of life that cats like to squeeze into small spaces where they feel much safer and more secure. Instead of being exposed to the clamor and possible danger of wide open spaces, cats prefer to huddle in smaller, more clearly delineated areas.

Kittens get securely snuggled by their mothers. (Credit: Shutterstock)

When young, they used to snuggle with their mom and litter mates, feeling the warmth and soothing contact. Think of it as a kind of swaddling behavior. The close contact with the box’s interior, we believe, releases endorphins – nature’s own morphine-like substances – causing pleasure and reducing stress.

Along with Temple Grandin, I researched the comforting effect of “lateral side pressure.” We found that the drug naltrexone, which counteracts endorphins, reversed the soporific effect of gentle squeezing of pigs. Hugs, anyone?

Also remember that cats make nests – small, discrete areas where mother cats give birth and provide sanctuary for their kittens. Note that no behavior is entirely unique to any one particular sex, be they neutered or not. Small spaces are in cats’ behavioral repertoire and are generally good (except for the cat carrier, of course, which has negative connotations – like car rides or a visit to the vet).

One variation on this theme occurs when the box is so shallow that it does not provide all the creature comforts it might.

Or then again, the box may have no walls at all but simply be a representation of a box – say a taped-in square on the ground. This virtual box is not as good as the real thing but is at least a representation of what might be – if only there was a real square box to nestle in.

This virtual box may provide some misplaced sense of security and psychosomatic comfort.

The cats-in-boxes issue was put to the test by Dutch researchers who gave shelter cats boxes as retreats. According to the study, cats with boxes adapted to their new environment more quickly compared to a control group without boxes: The conclusion was that the cats with boxes were less stressed because they had a cardboard hidey-hole to hunker down in.

Availability of a cozy box is part of a well-appointed space for a cat. (Credit: Lisa Norwood, CC BY-NC)

Let this be a lesson to all cat people – cats need boxes or other vessels for environmental enrichment purposes. Hidey-holes in elevated locations are even better: Being high up provides security and a birds’s-eye view of the world, so to speak.

Without a real box, a square on the ground may be the next best thing for a cat, though it’s a poor substitute for the real thing. Whether a shoe box, shopping bag or a square on the ground, it probably gives a cat a sense of security that open space just can’t provide.

Nicholas Dodman, Professor Emeritus of Behavioral Pharmacology and Animal Behavior, Cummings School of Veterinary Medicine, Tufts University

 

This article was originally published on The Conversation. Read the original article.

CATEGORIZED UNDER: Living World, Top Posts
MORE ABOUT: animals

Genomics Is Buried in Too Much Data

By Patrick Chain | April 10, 2017 12:26 pm
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(Credit: Alix Kreil/Shutterstock)

When a sore throat and sinus congestion warrant a visit to the doctor, your physician will attempt to determine whether a cold virus or bacterial infection is to blame—oftentimes without success. So, just to be safe, they might write a potentially unnecessary script for an antibiotic.

But what if a nurse could swipe your saliva and run a quick genetic test for bacteria? If the test results are negative, you get a prescription for a decongestant and orders to get some rest, rather than contributing to the widespread overuse of antibiotics. Read More

CATEGORIZED UNDER: Living World, Top Posts
MORE ABOUT: genetics

Do We Need a Word for Everything?

By Nathaniel Scharping | April 4, 2017 10:27 am
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(Credit: danm12/Shutterstock)

Imagine walking through a forest near dusk. It is peaceful and quiet; the setting sun paints streaks of light through tree trunks and across your path. The scene is familiar to anyone who’s ever taken a walk in the woods. 

Using one word, how would you describe the experience? 

You might defer to a string of adjectives: serenity, beauty, peace, fulfillment — words that dance around the feeling without ever precisely pinning it down. But that’s not the case in Japanese. In that language, a specific term encapsulates the feeling evoked by sunlight dancing through the trees: komorebi.

It’s a tidy way of packaging calm, wonder and harmony into one word. Read More

CATEGORIZED UNDER: Mind & Brain, Top Posts
MORE ABOUT: emotions, psychology

Get Lost in Mega-Tunnels Dug by South American Megafauna

By Andrew Jenner | March 28, 2017 1:39 pm
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Looking into a large paleoburrow in Brazil. (Courtesy: Heinrich Frank)

It was in 2010 that Amilcar Adamy first investigated rumors of an impressive cave in southern Brazil.

A geologist with the Brazilian Geological Survey (known by its Portuguese acronym, CPRM) Adamy was at the time working on a general survey of the Amazonian state of Rondonia. After asking around, he eventually found his way to a gaping hole on a wooded slope a few miles north of the Bolivian border.

Unable to contact the landowner, Adamy couldn’t study the cave in detail during that first encounter. But a preliminary inspection revealed it wasn’t the work of any natural geological process. He’d been in other caves nearby, formed by water within the same geology underlying this particular hillside. Those caves looked nothing like this large, round passage with a smooth floor.

“I’d never seen anything like it before,” said Adamy, who resolved to return for a closer look some day. “It really grabbed my attention. It didn’t look natural.”

Read More

CATEGORIZED UNDER: Living World, Top Posts
MORE ABOUT: paleontology

Revisited: The Regenerative Power of Pig Guts

By Adam Piore | March 27, 2017 3:09 pm
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(Credit: AVA Bitter/Shutterstock)

Bioengineers have made great strides harnessing the body’s ability to start over, whether regenerating heart tissue and bones, or using stem cells to regrow fingertips. Still, much of regenerative medicine’s promise remains inside the laboratory—or at least that was what I thought when I began reporting for The Body Builders: Inside the Science of the Engineered Human.

Some clinicians, like Dr. Eugenio Rodriguez, aren’t waiting for trials to be completed to help patients. Instead, they are already adding regenerative technologies to their medical toolboxes, and using them to save human limbs. Years ago down in Delray Beach, Florida, Rodriguez, a trauma surgeon, caused a bit of a sensation after exploring the regenerative powers of pig guts. Read More

CATEGORIZED UNDER: Health & Medicine, Top Posts
MORE ABOUT: biotechnology

Soaking in a Hot Bath Yields Benefits Similar to Exercise

By Steve Faulkner, Loughborough University | March 21, 2017 11:17 am

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Many cultures swear by the benefits of a hot bath. But only recently has science began to understand how passive heating (as opposed to getting hot and sweaty from exercise) improves health. The Conversation

At Loughborough University we investigated the effect of a hot bath on blood sugar control (an important measure of metabolic fitness) and on energy expended (number of calories burned). We recruited 14 men to take part in the study. They were assigned to an hour-long soak in a hot bath (40˚C) or an hour of cycling. The activities were designed to cause a 1˚C rise in core body temperature over the course of one hour. Read More

CATEGORIZED UNDER: Health & Medicine, Top Posts
MORE ABOUT: personal health

Phosphorus Is Vital for Life, and We’re Running Low

By Vera Thoss, Bangor University | March 15, 2017 11:05 am
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A farmer sprays field with a nitrogen, phosphorus, potassium fertilizer. (Credit: oticki/Shutterstock)

All life needs phosphorus and agricultural yields are improved when phosphorus is added to growing plants and the diet of livestock. Consequently, it is used globally as a fertilizer – and plays an important role in meeting the world’s food requirements.

In order for us to add it, however, we first need to extract it from a concentrated form – and the supply comes almost exclusively from phosphate mines in Morocco (with far smaller quantities coming from China, the US, Jordan and South Africa). Within Morocco, most of the mines are in Western Sahara, a former Spanish colony which was annexed by Morocco in 1975.

The fact that more than 70 percent of the global supply comes from this single location is problematic, especially as scientists are warning that we are approaching “peak phosphorus”, the point at which demand begins to outstrip supply and intensive agriculture cannot continue to provide current yields. In the worst case scenario, mineable reserves could be exhausted within as little as 35 years.

So what is going on – and how worried should be?

Here be phosphorus. (Credit: Shutterstock)

Natural Limits

In nature, phosphorus only exists bound to oxygen, which is called phosphate. It is in this form that it is mined. Chemists can remove the oxygens bound to it to get elemental white phosphorus, which glows in the dark, but it is so unstable that it spontaneously ignites on exposure to air.

Phosphate easily diffuses through soil or water and can be taken up by cells. When phosphate meets free calcium or iron, they combine to give highly insoluble salts.

In the first half of the 19th century, Justus von Liebig popularized the law of the minimum for agriculture, which states that growth is limited by the least available resource. It was soon discovered that this was often some form of phosphorus.

As a consequence, bones – comprised mostly of calcium and phosphate – from old battlefields were dug up to use in farming. Guano, large accumulations of bird droppings, also contains high concentrations of phosphorus and was used to fertilize crops. But supplies of this were soon depleted. As demand increased, supplies had to be mined instead.

But this applied inorganic phosphate fertilizer is highly mobile and leaches into watercourses. In addition, phosphate rock weathers and is also ultimately washed into the ocean where it either deposits as calcium phosphate or is taken up by marine organisms who also eventually deposit on the ocean floor when they die. Consequently, terrestrial phosphorus doesn’t really disappear, but it can move beyond our reach.

Natural Wastage

To complicate matters further, even the phosphorus we can use is largely wasted. Of the phosphorus mined as fertilizer, only a fifth reaches the food we eat. Some leaches away and some is bound to calcium and iron in the soil. Some plant roots have the ability to extract the latter, but not in large enough quantities to retrieve all of it.

In addition to these inorganic forms, phosphate is also converted into cellular compounds, creating organically-bound phosphorus, such as phospholipids or phytate. After the death of an organism, these organic phosphorus compounds need to be returned into the useable phosphate form. How much organically-bound phosphorus is present in soils depends on the number and activity of the organisms that can do this.

Phosphorous boosts crop yields. (Credit: Shutterstock)

Agricultural soils are usually rich in inorganic phosphorus while in undisturbed ecosystems, such as forests and long-term pastures, organically-bound phosphorus dominates. But agricultural land is often depleted of phosphorus during harvest and land management practices such as ploughing, hence the addition of phosphate-containing fertilizers.

Spreading manure and avoiding tillage are ways of increasing microbial abundance in the soil – and so keeping more phosphorus in an organically-bound form.

The risks of peak phosphorus can be countered with some simple solutions. Eating less meat is a start as huge amounts are used to rear livestock for meat. The chances are that agricultural yields are limited by phosphorus availability and will be further stretched as the global population grows.

Humans are themselves wasteful of phosphorus, as most of what we take in goes straight out again. Fortunately, technologies have been developed to mine phosphorus from sewage, but at present are too expensive to be practical.

Peak phosphorus does not mean that phosphorus will disappear, rather that the reserves with mineable high concentrations are depleting. Instead, we are increasing the background concentrations of phosphorus and adding it to the ocean floor. More sustainable phosphorus use requires a greater appreciation and understanding of the many organisms that make up soils – and the part they play in phosphorus distribution – or we may no longer be able to feed the world at an affordable price.

 

This article was originally published on The Conversation. Read the original article.

CATEGORIZED UNDER: Living World, Top Posts
MORE ABOUT: chemistry

VX Nerve Agent: The Deadly Weapon Engineered in Secret

By Carl Engelking | February 24, 2017 4:30 pm
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A World War II-era contamination suit. (Credit: Shutterstock)

In January 1958, two medical officers at Porton Down, Britain’s military science facility, exposed their forearms to 50-microgram droplets of a substance called VX, which was a new, fast-acting nerve agent that could kill by seeping through the skin.

VX, short for “venomous agent X,” is tasteless, odorless and causes uncontrollable muscle contractions that eventually stop a person’s breathing within minutes. That experiment in 1958, according to University of Kent historian Ulf Schmidt, was perhaps the first human test of VX in the Western world. Read More

What Causes a ‘Butterflies in the Stomach’ Sensation?

By Bradley Elliott, University of Westminster | February 21, 2017 7:00 am
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(Credit: Shutterstock)

If you have ever been nervous about something that is about to happen, then you may have felt the sensations of nausea and “fluttering”—the recognizable and odd sensation deep in your gut known as having “butterflies in the stomach.”

Perhaps you were about to give a speech to a large audience, were in the waiting room for a big interview, were about to step up and take a key penalty shot or about to meet a potential love interest. Rather than actual butterflies bouncing around your large intestine, of course, there is of course something more scientific going on—and it’s all down to your nervous system. Read More

CATEGORIZED UNDER: Top Posts, Uncategorized

Collective False Memories: What’s Behind the ‘Mandela Effect’?

By Caitlin Aamodt | February 16, 2017 1:45 pm

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Would you trust a memory that felt as real as all your other memories, and if other people confirmed that they remembered it too? What if the memory turned out to be false? This scenario was named the ‘Mandela effect’ by the self-described ‘paranormal consultant’ Fiona Broome after she discovered that other people shared her (false) memory of the South African civil rights leader Nelson Mandela dying in prison in the 1980s.

Is a shared false memory really due to a so-called ‘glitch in the matrix’, or is there some other explanation for what’s happening? Broome attributes the disparity to the many-worlds or ‘multiverse’ interpretation of quantum mechanics. Read More

CATEGORIZED UNDER: Mind & Brain, Top Posts
MORE ABOUT: Memory & learning
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