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Chemists developed a way to synthesize complex molecules called oligocyclotryptamines, originally found in plants, which could hold potential as antibiotics, analgesics, or anticancer drugs.

A team has reported the first demonstration of selective electrochemical separation driven by halogen bonding. This was achieved by engineering a polymer that modulates the charge density on a halogen atom when electricity is applied. The polymer then attracts only certain targets -- such as halides, oxyanions, and even organic molecules -- from organic solutions, a feature that has important implications for pharmaceuticals and chemical synthesis processes.

In the quantum realm, a particle’s properties can be separate from the particle itself, including its angular momentum – which could require a rethinking of fundamental laws

Martian landers have been able capture measurements of wind speeds -- some gauging the cooling rate of heated materials when winds blow over them, others using cameras to image 'tell-tales' that blow in the wind -- but there's still room for improvement. Researchers now demonstrate a novel sonic anemometric system featuring a pair of narrow-band piezoelectric transducers to measure the travel time of sound pulses through Martian air. The study accounted for variables including transducer diffraction effects and wind direction.

Martian landers have been able capture measurements of wind speeds -- some gauging the cooling rate of heated materials when winds blow over them, others using cameras to image 'tell-tales' that blow in the wind -- but there's still room for improvement. Researchers now demonstrate a novel sonic anemometric system featuring a pair of narrow-band piezoelectric transducers to measure the travel time of sound pulses through Martian air. The study accounted for variables including transducer diffraction effects and wind direction.

A computer algorithm has achieved a 98% accuracy in predicting different diseases by analyzing the color of the human tongue. The proposed imaging system can diagnose diabetes, stroke, anemia, asthma, liver and gallbladder conditions, COVID-19, and a range of vascular and gastrointestinal issues, according to new research.

The smaller carbon footprint, or wheel print, of automatic delivery robots can encourage consumers to use them when ordering food, according to a new study. The suitcase-sized, self-driving electric vehicles are much greener than many traditional food delivery methods because they have low, or even zero, carbon emissions. In this study, participants who had more environmental awareness and knowledge about carbon emissions were more likely to choose the robots as a delivery method. The green influence went away though when people perceived the robots as a high-risk choice -- meaning they worried that their food would be late, cold or otherwise spoiled before it arrived.

The smaller carbon footprint, or wheel print, of automatic delivery robots can encourage consumers to use them when ordering food, according to a new study. The suitcase-sized, self-driving electric vehicles are much greener than many traditional food delivery methods because they have low, or even zero, carbon emissions. In this study, participants who had more environmental awareness and knowledge about carbon emissions were more likely to choose the robots as a delivery method. The green influence went away though when people perceived the robots as a high-risk choice -- meaning they worried that their food would be late, cold or otherwise spoiled before it arrived.

Scientists have made a groundbreaking discovery in the field of nanotechnology. They have developed a novel microscopy method that allows for the unprecedented visualization of nanostructures and their optical properties.

Researchers have used silicon photonic microchip components to perform a quantum sensing technique called atom interferometry, an ultra-precise way of measuring acceleration. It is the latest milestone toward developing a kind of quantum compass for navigation when GPS signals are unavailable.

Researchers have started to unravel the mysteries of how near-horizontal bowling in cricket leads to such tough-to-hit balls. The team employed a wake survey rake device made of multiple tubes designed to capture the pressure downstream of the ball and examined the flow dynamics of cricket balls rotating up to 2,500 rpm in a wind tunnel. The group found that low-pressure zones expanded and intensified near the ball when spinning, while these zones shifted and diminished downstream. At higher spin rates, the low-pressure zone begins to change to a persistent bilobed shape. The results lend support to the theory that these newer bowling techniques tap into the Magnus effect.

Researchers used large language models to efficiently detect anomalies in time-series data, without the need for costly and cumbersome training steps. This method could someday help alert technicians to potential problems in equipment like wind turbines or satellites.

Researchers used large language models to efficiently detect anomalies in time-series data, without the need for costly and cumbersome training steps. This method could someday help alert technicians to potential problems in equipment like wind turbines or satellites.

A fire at the Russian-occupied Zaporizhzhia Nuclear Power Plant in Ukraine has former workers at the facility worried about a lack of experienced personnel and equipment needed to keep it safe

Cases of prostate cancer are surging alarmingly around the world. Thankfully, we are developing more accurate tests that can catch the condition early

Yesterday we visited a section of Table Mountain National Park, a part that was formerly called Cape Peninsula Park. The latter includes a large natural area that houses the extreme southwestern tip of Africa: The Cape of Good Hope.

On the night before, though, we dined on bobotie, a recipe from the Cape Malay region of South Africa, though Wikipedia gives it an ancient origin. Rita made the salad and main dish:

Bobotie appears to be a variant of patinam ex lacte, a dish documented by the ancient Roman writer Apicius consisting of layers of cooked meat, pine nuts, and seasoned with pepper, celery seeds and asafoetida. These were cooked until the flavours had blended, when a top layer of egg and milk was added. When the latter had set, the dish was ready to be served. C. Louis Leipoldt, a South African writer and gourmet, wrote that the recipe was known in Europe in the seventeenth century.

The bobotie, made with fruit as well, was terrific:

But Martim, who, I’m told, is a creditable baker, made a pear crumble with chocolate. I had it with sour cream on top. Yum!

On the drive there, we saw dozens of chacma baboons by the roadside, along with many signs saying “Beware of baboons” or “Do not feed the baboons.” They are hungry and aggressive, and often vicious.  If show them a banana, you have a good chance of dying. This one was grooming another, and the groomee apparently enjoyed its belly rub.

A troop. The babies are very cute, but the signs have made me scared of them. As I said before, a few years ago one of these squalid primates, being chased by a guard, jumped on Martim’s back and knocked him over.

A map of the park, which occupies the Peninsula. There’s a large “false bay” to the east which fooled early sailors who took a hard left at the Cape of Good Hope prominence at the tip of the Peninsula.  Rather then turning into the false bay, you take a gentle left and, lo, you’re on the way around Africa.

The first European to circle the southern tip of Africa was the Portuguese navigator Bartolomeu Dias in early 1488, paving the way for a route from Europe to India. Dias was in on the beginning of Vasco da Gama‘s successful expedition that made it to India exactly ten years later, and then returned. (Dias, however, got off at the Cape Verde Islands, and died on another venture around Africa in 1500, perishing in a storm—ironically at the Cape of Good Hope.)

This area is where the warm currents of the Indian Ocean meet the frigid currents from Antarctica. This is described below:

The entrance to False Bay, with the Cape of Good Hope (a small mountain) to the right and out of sight (see below):

The False Bay is where you wind up if you make a hard left at the Cape of Good hope. You have to make a gentle left heading towards Gansbaai and then keep hugging the African coast to really circle the southern tip of Africa:

The Cape of Good Hope, described as the extreme southwest tip of Africa, is the smallish “mountain” denuded of vegetation, to the rear:

Lo, the Cape of Good Hope:

A happy kid and his dad at the Cape. (The kid was laughing, not crying.)

A “pagoda”, or species of Mimetes, related to Proteus:

A cluster spiderhead (Serruria glomerata), a narrow endemic in the area:

Common silkypuff (Diastella divaricata), also found only on the Cape Peninsula:

A plant with the Afrikaans name of Hangertjies (Erica plukenetii):

Watch out for tortoises! Apparently the park is loaded with tortoises, but it was chilly yesterday and none showed. We did see one reptile (see below):

A black girdled lizard (Cordylus niger), which occurs only in several mountains on the Cape Peninsula, so it’s a narrow endemic:

Spot the lizard, peeking out for a bit of sun:

A sign by a steep cliff near the Cape of Good Hope. The meaning is clear:

A common eland (Taurotragus oryx), the second largest antelope in the world after the giant eland (also of Africa). Note two red-winged starlings on its back, eating the mammal’s parasites.

The widespread Greater Crested Tern (Thalasseus bergii), distributed widely in the tropical and subtropical Old World:

Cape cormorants (Phalacrocorax capensis) and one white-breasted cormorant (Phalacrocorax lucidus).

The park harbors common ostriches (Struthio camelus), and three of them crossed the road ahead of us. I was terribly excited as this was the first ratite I’d seen in the wild. They are BIG! (The black color gives this away as a male; females are browner.)

Evolution wound up with some strange (but well adapted) products:

One of several bontebok (Damaliscus pygargus), a medium-sized antelope.

They have white butts:

Martim took these pictures for me; the birds come to a feeder in our garden. This is a Cape White-Eye (Zosterops virens), native to southern Africa. The source of its name is obvious.

And two photos of a beautiful male Southern double-collared sunbird (Cinnyris chalybeus); the female is brown. As you can guess from where it’s sitting and the shape of its bill, it’s a nectar feeder. It’s a metallic malachite green with a red and a yellow collar:

On to Kruger today (if the weather is okay)!

https://traffic.libsyn.com/secure/sciencesalon/mss456_Sara_Walker_2024_08_13.mp3 Download MP3

What is life? This is among the most difficult open problems in science, right up there with the nature of consciousness and the existence of matter. All the definitions we have fall short. None help us understand how life originates or the full range of possibilities for what life on other planets might look like.

In Life as No One Knows It, physicist and astrobiologist Sara Imari Walker argues that solving the origin of life requires radical new thinking and an experimentally testable theory for what life is. This is an urgent issue for efforts to make life from scratch in laboratories here on Earth and missions searching for life on other planets.

Walker proposes a new paradigm for understanding what physics encompasses and what we recognize as life. She invites us into a world of maverick scientists working without a map, seeking not just answers but better ways to formulate the biggest questions we have about the universe. The book culminates with the bold proposal of a new theory for identifying and classifying life, one that applies not just to biological life on Earth but to any instance of life in the universe. Rigorous, accessible, and vital, Life as No One Knows It celebrates the mystery of life and the explanatory power of physics.

Sara Imari Walker is an astrobiologist and theoretical physicist interested in the origin of life and discovering alien life on other worlds. She is deputy director of the Beyond Center for Fundamental Concepts in Science and a professor in the School of Earth and Space Exploration at Arizona State University. She is also a fellow of the Berggruen Institute and a member of the external faculty at the Santa Fe Institute. She is the recipient of the Stanley L. Miller Early-Career Award for her research on the origin of life, and her research team at ASU is internationally regarded as being among the leading labs aiming to build a fundamental theory for understanding what life is. Her research has been featured in Scientific American, Quanta Magazine, and a variety of other international outlets.

Shermer and Walker discuss:

• Defining life
• Defining the self
• Defining the individual organism
• Materialism, vitalism, idealism, and Platonic ideas
• Where are the laws of nature?
• Is the universe mathematical?
• Why we need a paradigm shift in origins of life research
• Assembly theory and what it predicts
• Phase transitions in the origin and evolution of life
• The hard problem of consciousness
• Free will, volition, combatibilism, determinism
• What’s wrong with current definitions of life, self, and individual?
• Possible theories for how life originated on Earth
• Symbiogenesis: from Procaryote to Eucaryote cells
• Searching for biosignatures on exoplanets
• Dyson spheres and other technosignatures
• Avi Loeb’s Galileo Project
• What might aliens be like?
• Kardashev scale of civilizations
• Deities for Atheists, Skygods for Skeptics: aliens as gods and the search as religion.

If you enjoy the podcast, please show your support by making a $5 or $10 monthly donation.

When we talk publicly about the effects of human activity on the climate should we refer to “global warming”, “climate change”, the “climate crisis” or to “climate justice”? Perhaps we should also be more technical and say specifically, “anthropogenic climate change”. This kind of question is often referred to as “framing”, meaning that we need to be thoughtful about how we frame topics for science communication and open discussion.

I remember about two decades ago when the concept of “framing” was really introduced into the skeptical community. There was a lot of pushback, because the practice was considered to be deceptive, and more aligned with political persuasion than science communication. This criticism was unfounded, in my opinion, largely because it is naive. It assumes, falsely, that you can communicate without framing. In reality you are framing your messages whether you know it or not, so you might as well be conscious and thoughtful about it.

To get into more detail, what is meant by framing is the overall approach to a topic in terms of major perspectives and considerations. For example, we can frame a discussion on GMOs as purely a scientific question – what does the evidence say about the risks and benefits of genetic engineering technology? We can also frame the topic as one of regulation – how should governments regulate GMOs? Or we can focus on corporate behavior and power. Often, the explicit framing I take on this blog, the framing focusses on critical thinking, pseudoscience, and conspiracy theories. How do we think logically and make sense of all the claims and information?

Often framing is deliberate and manipulative, even deceptive. This is common in politics, which is why there can be a negative reaction to the concept. Do we talk about gun control, gun regulation, or gun safety? Should we frame the inheritance tax as a “death tax”, or hospital ethics committees as “death panels”? Deceptive framing can “rig the game” by trying to bake in unwarranted assumptions right at the beginning of a discussion – assuming your conclusion.

But just because framing can be abused does not mean it is always a bad practice or something to be avoided. Again – if you are having a discussion, you are using framing, whether you know it or not. The real goal is to properly and fairly frame a discussion or debate – don’t make unwarranted assumptions, don’t use overly emotional or biased terms, don’t exclude legitimate concerns (by using a narrow framing), and don’t be unfair to any one side.

Sometimes different framings are equally valid, but may affect how a message is perceived. There is a vast literature on this. For example, if a surgeon tells you that a surgical procedure they are recommending has a 98% survival rate you are more likely to accept the procedure than if they say it has a 2% fatality rate. This is the exact same information, just framed differently.

You may be thinking -well, just say both so as not to bias the information. That may be reasonable in some cases, but that is also just another aspect of framing – how much information do you give, and in how many different formats? In a technical journal, giving maximally technical and precise information, from multiple perspectives, is likely appropriate. Give the P-value, and the number needed to treat, the effect size, and the Bayesian analysis. But is this the best way to communicate that information to a patient facing a life-and-death decision? Overwhelming the target with highly technical information is not always the most effective method of communication. Anything less that that, however, means giving a simplified approximation, which requires decisions about which information to include, and in what format. This is framing. There is also a continuum from giving a bottom-line, single point framing all the way to maximal detail – and that is another decision that should be conscious and deliberate.

What is the best or most appropriate framing depends on context. Who is your audience, and what exactly are you trying to convey? Is this a public health message meant to have a maximal impact on behavior? Or are you trying get people to think more deeply and with more nuance about a complex topic?

Bringing this back to climate change, a recent study looked at different terms to use when referring to the topic – global warming, climate change, climate crisis, climate emergency, and climate justice. They found that people were more familiar with the terms global warming and climate change (about 88%), less so to crisis or emergency (76 and 58%), and least to climate justice (33%). Further, they were also less likely to express concern about these topics, in proportion to their familiarity. They concluded that familiarity with the terms used in framing a topic affects how the receiver responds to the messaging.

Of course there are other conf0unding variables as well. For example, it is possible that when using terms like “crisis” and “emergency” people may feel these terms are biased therefore the messenger is biased. They may react to emotional language defensively, on the assumption (usually a good one) that they are being manipulated. Also, the term “justice” has a lot of social baggage, as it has often been framed negatively as a zero-sum game – justice for one group comes at the expense of another group. But it does seem that familiarity is a consistent factor as well.

These are all good things to consider when framing a message. The authors conclude that we should stick with climate change and global warming, because people are most familiar with these terms. However, you could just as easily argue that we should spend capital on communicating the concept of climate justice to make people more familiar with the term. They don’t directly compare these strategies. This is a common debate we have within skepticism and science communication – do we use familiar terms, or market new terms that have a better framing? This depends on the details – sometimes the familiar terms are negatively framed and need to change. But sometimes we need to live with the familiar terms. Either way, decisions should be appropriate and strategic, not made thoughtlessly and by default.

The post Framing and Global Warming first appeared on NeuroLogica Blog.

Neptune’s largest moon, Triton, is one of the most biologically interesting places in the solar system. Despite being hard to reach, it appears to have active volcanoes, a thin atmosphere, and even some organic molecules called tholins on its surface. However, Voyager only visited it once, in passing, 35 years ago. Technology has advanced a lot in the intervening decades, and a new push for a lander on Triton specifically has been garnering attention. One such mission was described by Steve Oleson and Geoffrey Landis of NASA’s Glenn Research Center. Their concept mission, known as Triton Hopper, was funded by NASA’s Institute for Advanced Concepts (NIAC) back in 2018 and utilized a cryogenic pump to extract propellant from Triton’s surface to power a “hopper” that could travel up to 5 km a month, and do some fascinating science along the way.

The first challenge to any mission on Triton is getting there. As part of the NIAC final report for the Triton Hopper, the authors performed a preliminary study examining different propulsion methods. Solar electric propulsion and aerobraking in Neptune’s larger atmosphere came out on top. The Hopper would have to hitch a ride with a larger orbital spacecraft responsible for trajectory planning of the “hops” and communicating with Earth.

Once safely deposited on Triton’s surface, a hopper could do lots of exciting science. The instrument payload described in the mission brief included ground-penetrating radar, spectroscopy equipment, a microscope, and even a seismometer. In total, the whole system weighed just under 300 kg—relatively light for an interplanetary mission.

Video describing the Triton Hopper mission in detail.
Credit – Dreksler Astral YouTube Channel

But most of that weight wouldn’t be in the instrumentation—it would be in the Hopper’s unique propulsion system. The concept behind the propulsion system is simple enough: Get some propellant material into the spacecraft, then heat that material to a point where it is pressurized. Once enough pressure is built up, release it as a jet stream that would allow the 300 kg spacecraft to overcome the relatively weak gravity of Titan, which is only ½ the gravity of our own Moon.

The study focused on two main ways to get material into the Hopper – a shovel and a cryogenic pump. Each has its advantages, though the pump was more effective, at least in the theoretical simulations run as part of the Phase I project. The shovel suffered from potential contamination by other material being loaded into the propellant collection hopper and either blocking the nitrogen-rich ice and snow from entering it or itself being absorbed into the thermal chamber and sucking up some of the heat intended to melt the propellant.

On the other hand, a cryopump could use waste heat from the rover’s normal power-generating operations to directly melt the ice and snow the Hopper landed on and absorb that into a heating chamber, where it would be further heated before being used as a propellant. This methodology can be effective at gathering the best propellant options and providing an outlet for the lander’s waste heat that doesn’t just radiate into Triton’s thin atmosphere.

Fraser discusses why Triton is so interesting with Dr. Jason Hofgartner

Once enough pressure is built up by heating the propellant, the Hopper can take off from the moon’s surface and “hop” a short distance using its six power and four steering thrusters. The authors estimate about 50 seconds of specific impulse once a month. While that might not seem like a lot, it would allow the Hopper to cover about 150 kilometers over the course of a two-year mission.

It could find plenty of interesting scientific spots in those two years. However, the mission, which is also competing for resources with plenty of other mission concepts for Triton landers, appears to be on hold. It hasn’t received a Phase II, and there haven’t been any development updates in the last few years. But given the general popularity of the hopper concept even on other worlds in our solar system and the desirability of Triton as an exploration destination, it seems likely that someday some form of this mission will soar above the ice surface of Neptune’s biggest moon. It might just be a while before it does.

Learn More:
Oleson & Landis – Triton Hopper: Exploring Neptune’s Captured Kuiper Belt Object
UT – NASA Wants to Send a Low-Cost Mission to Explore Neptune’s Moon Triton
UT – Will Triton finally answer, ‘Are we alone?’
UT – Want to Explore Neptune? Use Triton’s Atmosphere to Put on the Brakes

Lead Image:
Artist’s conception of the Triton Hopper mission.
Credit – S. Oleson

The post A Hopper Could Explore Over 150km of Triton’s Surface In Two Years appeared first on Universe Today.

We’ve all read the advice, during a meteor shower there is no equipment needed. All you need to do is lay back and wonder at one of the most spectacular sights the universe has to offer. That’s about it though and while you lay back on a lounger and watch it really can be a wonderfully grounding and relaxing experience. Unless you happen to be on National TV and miss a meteor behind your head and just tell the world there’s nothing to see. Not that I’m bitter about that of course!

It’s quite easy to get confused; a meteor is a piece of rock that has fallen through the Earth’s atmosphere and been destroyed on its way down, a meteorite survives the plunge and a meteoroid is a piece of space rock floating through space before it encounters the atmosphere. We can see meteors any night of the year and these are called sporadic meteors however around 20 times a year we can enjoy a burst of meteor activity in events known as meteor showers. There are other showers but these are often faint and barely even noticeable. 

A brilliant Geminid meteor shower photographed from Mt. Balang, China. Credit: NASA/Kevin Wu

Individual meteors are seen as they plummet to Earth. Their passage through the atmosphere causes the gas to heat and emit light which we see as the familiar streak of light. The atmosphere is of great importance to us because it protects us from countless meteoric visitors that would otherwise strike the surface. Instead, only the largest get through but thankfully they are few and far between. Spacecraft and satellites of course orbit above the protective shield of the atmosphere and so are far more susceptible to damage. 

Organisations like NASA take the risk of meteoroid impact very seriously and their greater concern is the sporadic meteors. The showers that we all enjoy only raise the risk for a short time and their characteristics are well understand. This means that their risk profile can be very well calculated with NASA’s Meteoroid Environment Office issuing regular forecasts. The real risk though comes from outbursts, one off unexpected meteoroids or from the countless minor showers that are not yet well documented or understood. 

This isn’t just a paper based exercise though. The International Space Station has been in orbit since 1998 and in that time has had to adjust its course numerous times. There have been occasions when the occupants have had to get into an escape module and distance themselves from the Station due to possible meteoroid impact. To date though, there has been no major damage. There are thousands of satellites in orbit to and damage has been sustained by some. 

International Space Station. Credit: NASA

A paper recently published by Althea V. Moorhead and a small multi-discipline team from NASA’s Meteoroid Environment Office and the University of Western Ontraio looks at quantifying potentially hazardous meteor showers and looks at existing showers to determine which are high risk and of concern. 

The team conclude that for a shower to be classed as hazardous, the number of meteoroids of a certain mass or larger that impact upon an exposed spacecraft surface in low Earth orbit over a unit of time (known as the meteoroid flux) must raise by 5% over the sporadic rate. This would contribute 105 Joules of energy, sufficient to damage relatively delicate spacecraft components. The team are clear that they do not recommend spacecraft should mitigate for this level but instead, at least highlight for investigations from meteoroid forecast reports. 

Having identified the criteria, the team then assessed 74 of the established 110 meteor showers listed in the IAU Meteor Data Centre catalogue. They found that six showers would meet the criteria for being categorised as hazardous, indeed they exceeded the threshold by a factor of two! The showers of note are the daytime Arietids, Geminids, Perseids, Quadrantids, Southern Delta Aquariids and the daytime Xi Sagittariids. There are a further 11 showers that meet the threshold but do not exceed by a factor of two. 

Clearly as the study shows spacecraft operators need to be very conscious of meteoroid activity not just in their orbital operations but also in design and planning. To those of us on the ground we can still of course, sit back and relax to enjoy the spectacle but it adds an interesting context that, as we step out into the universe, those wonderful showers pose a very real risk to the safety of our explorers. 

Source : The threshold at which a meteor shower becomes hazardous to spacecraft

The post Can Meteor Showers Be Dangerous to Spacecraft? appeared first on Universe Today.