233 articles from TUESDAY 12.11.2019

While the field of morphology—the study of the form and function of organisms—is centuries old, the last two decades have brought incredible leaps forward through the emergence of new technologies and genetic research methods. And the impact of these advances has been revolutionary for the scientists working to untangle the vast biodiversity and evolutionary paths of the world of insects.

According to the International Union for Conservation of Nature (IUCN), whale sharks are considered endangered, which means the species has suffered a population decline of more than 50% in the past three generations. The whale shark is only two classifications from being extinct. Improvements and conservation efforts are in place, but there is still a long way to go to protect these gentle underwater giants.

The generation of species-specific singing in songbirds is associated with species-specific patterns of gene activity in brain regions called song nuclei, according to a study published November 12 in the open-access journal PLOS Biology by Kazuhiro Wada of Hokkaido University in Japan, and colleagues. According to the authors, the findings could be a promising step toward a better understanding of the contribution of multiple genes to the evolution of behaviors.

Reproducibility is a major challenge in experimental biology, and with the increasing complexity of data generated by genomic-scale techniques this concern is immensely amplified. RNA-seq, one of the most widely used methods in modern molecular biology, allows in a single test the simultaneous measurement of the expression level of all the genes in a given sample. New research publishing November 12 in the open-access journal PLOS Biology by Shir Mandelbaum, Zohar Manber, Orna Elroy-Stein, and Ran Elkon from Tel Aviv University, identifies a frequent technical bias in data generated by RNA-seq technology, which recurrently leads to false results.

Bambang Hero Saharjo has received death threats for testifying against companies

A scientist who takes on the companies responsible for massive wildfires across Indonesia has won the prestigious John Maddox prize for standing up for science in the face of harassment, intimidation and lawsuits.

Bambang Hero Saharjo, a fire forensics specialist at Bogor Agricultural University, gathers evidence for criminal trials against firms that are accused of using illegal slash-and-burn methods to clear peatland for cash crops such as palm oil, pulpwood and rubber trees.

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For the first time in the history of space exploration, scientists have measured the seasonal changes in the gases that fill the air directly above the surface of Gale Crater on Mars. As a result, they noticed something baffling: oxygen, the gas many Earth creatures use to breathe, behaves in a way that so far scientists cannot explain through any known chemical processes.

‘Ultima Thule’ no more: New Horizons’ space snowman is named ArrokothThe snowman-shaped object that NASA's New Horizons probe flew past nearly a year ago on the solar system's icy fringe now has a Native American name: Arrokoth, a word that means "sky" in the Powhatan/Algonquian language. Arrokoth replaces earlier labels for the Kuiper Belt object, including the numerical designation 2014 MU69 and the nickname Ultima Thule, which turned out to be rather controversial. Members of the New Horizons science team announced today that their proposed name has won approval by the International Astronomical Union and its Minor Planet Center. Before making the proposal, the scientists won the consent of elders… Read More

This blog post originated in the 2018 Science Mission Directorate Science and Technology Report.


High-Performance In Situ Dust Analyzer (Hyperdust)


Hyperdust’s unique ion optics design combines the ability to provide high-performance composition measurements with the aperture that is needed to detect a statistically significant number of particles in space over a standard mission duration of a few years.

Photo of hyperdust prototype
The Hyperdust prototype instrument’s ion optics. (Image credit: Tibor Balint)

The history of the formation and evolution of the Solar System is encoded in the compositional diversity of its small bodies, including comets and asteroids, and the solid material that was the source of it all: interstellar dust. But there are simply too many small bodies to be visited and investigated individually. Instead, what if scientists could survey the tiny particles (microsamples) that originate from these bodies and are delivered near Earth’s orbit by dynamic processes?

The High-Performance In Situ Dust Analyzer (Hyperdust) Project is developing a highly capable instrument to measure the compositional diversity of many thousands of solid particles in space. The Composition Analyzer part of this instrument is now in development for deployment on NASA’s Interstellar Mapping and Acceleration Probe (IMAP) mission to be launched in 2024. Over the past four years, the Hyperdust Project has been maturing a novel instrument concept that will provide the capability of analyzing the composition of micron- and submicron-sized cosmic dust particles with higher resolution and sensitivity than ever before. The National Research Council’s 2013 Planetary Science Decadal Survey notes that, “There are too many asteroids, comets and KBOs [Kuiper belt objects] to explore individually by spacecraft.” Over the past 30+ years, in situ composition measurements have been obtained only for a handful of asteroids and comets. The Hyperdust instrument offers a paradigm shift, from an approach limited to observing a few bodies individually, to one surveying the entire solar system and beyond.

schematics of the hyperdust instrument
The schematics of the full Hyperdust instrument. The Hyperdust Project team developed many of the key technologies enabling the instrument’s unique capabilities. (Image credit: Tibor Balint)

Hyperdust is a complex instrument that measures the velocity vector and composition of each cosmic particle encountered in space. The former measurements are accomplished by the Trajectory Sensor, which consists of an array of wire electrodes that sense the particles when they enter through the aperture. The velocity information is used to identify the origin of each particle based on its orbit around the Sun. The Composition Analyzer then measures the composition of ions that are generated by the high-speed impact of the dust particle on a clean metal surface. This information reveals the elemental and chemical composition of the impacting dust. The Hyperdust project team developed key elements of this measurement capability, namely the sensitive electronics needed to detect the particle in the Trajectory Sensor, the refined ion optics, and the ion detector.

The full Hyperdust instrument is approximately 70 cm tall and has a disk-shaped impact collection surface that is 40 cm in diameter. Such large size is needed to collect a statistically significant number of particles and their composition information. The Composition Analyzer part of the instrument has been selected to fly on the IMAP mission—the fifth mission selected in NASA’s Solar Terrestrial Probes program. The goal of the IMAP-bound instrument is to map out the composition of interstellar particles traversing through the solar system and link their composition to the characteristics and physical processes of the interstellar medium.

Photo of detector prototypes
Two copies of the SUDA ion detector prototype. The SUDA detector is built on the Hyperdust technology development. (Image credit: LASP/CU)

Besides detecting and analyzing cosmic dust in interplanetary space, the technology advanced during development of the Hyperdust instrument is also supporting exploration of icy worlds and their habitability. For example, NASA is developing the SUrface Dust Analyzer (SUDA) instrument for the Europa Clipper mission. SUDA carries an ion detector that is based on that developed for Hyperdust. The SUDA instrument will analyze the icy particles originating from the surface of the Jovian moon Europa, and identify the chemicals embedded in the ice, both organic and inorganic.


Planetary Science Division’s MatISSE Program


Dr. Zoltan Sternovsky, University of Colorado

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Photo of hyperdust prototype

New research reveals that carbon nanotubes (CNTs) as a coating can both repel and hold water in place, a useful property for applications like printing, spectroscopy, water transport, or harvesting surfaces. When water is dropped on a CNT forest, the CNTs repel the water, and it forms a sphere. However, when flipped over, the drop does not fall to the ground but rather clings to the surface.

Dave Morris on the collective power of research and Alastair Leake on the decline in moth populations

The efforts of campaigners to highlight important issues can often be overlooked by a historical approach that focuses on individuals, often academics or politicians. An example is in the obituary of the biologist Victoria Braithwaite (Obituary, 9 November), which asserts that “until the early 2000s everyone knew that fish do not feel pain”. But almost 20 years earlier, we had produced and started to widely distribute a leaflet called Fish Feel Pain. And of course hundreds of thousands of people were already refusing to eat fish on those very grounds.

In that same era, our group and others were campaigning on a range of other matters – such as traffic pollution, junk food, the arms trade, non-renewable energy, single-use plastics, environmental destruction – which may have seemed marginal at the time but are now acknowledged as mainstream concerns.

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Boarding schools | Wellington college fees | Steve McQueen’s Year 3 project | Spike Milligan’s election advice | Shared ancestry | Parliamentary disillusion

George Monbiot’s article on boarding schools (Journal, 7 November) will have been a painful read for many, and may well have been painful for him to write. As a director for Boarding School Survivors Support (BSSS), I read of experience after experience of suffering. I applaud Mr Monbiot for having the courage to bring his story into the public eye. For those who suffer, there is help: visit the BSSS website as a first step.
Margaret Laughton

• Mike Hoskin (Letters, 11 November) says the current fees for Wellington college (my alma mater) are about £30,000. In fact it charges about £42,000 a year for boarders. His point nonetheless remains entirely valid.
Chris Entwistle
Tiptree, Essex

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Since the Egyptian pyramids and the Roman Coliseum were built, mankind has been searching for an affordable, versatile building material, that can be easily manufactured and transported, and, above all, which is durable. Concrete, a mixture of water, cement and different kinds of minerals and rocks, has all these characteristics, which is why it is currently the most-used material in all sorts of structures. However, there is an issue that preoccupies professionals in the construction industry all over the world: the corrosion of steel bars that internally strengthen structures made of reinforced concrete. This situation causes rapid, internal deterioration of frames and may even lead to buildings collapsing.