Press releases archive 鈥� 2020
Oct
26
2020
09:21
Film and media scholars at 51猎奇 Frankfurt dissect the new media world of the pandemic聽
Of drones, dating-apps and Trump鈥檚 COVID strategy
With the onset of the current pandemic, our lives have
become more digital and more mediatized than ever before. But how can we
understand this transformation, and how can we envision our lives in this 鈥渘ew鈥�
media world? A new publication edited by a group of media scholars working in
Frankfurt offers a glimpse of some of the research questions and challenges to
come.
FRANKFURT. The
current pandemic poses a particular challenge for film and media scholars.
COVID-19 changes not just their work routines but transforms their very object
of study: the media. 鈥淎s a consequence of the pandemic, we have to adapt
ourselves to new conditions of producing, accessing, consuming, sharing, and
deploying media for the flow of information, labor, goods, policies, and culture鈥�,
says Laliv Melamed, post-doc researcher in the Graduate Research Training
Program 鈥淜onfigurationen des Films鈥� (). Together with her colleague Phillipp
Keidl, Melamed has initiated and co-edited the collection 鈥淧andemic Media鈥�,
which appears as an open access publication this week.
鈥溾�楶andemic Media鈥� is an attempt to meet
the challenges of the pandemic with a series of flashlight essays which address
current and future research questions in media studies鈥�, says professor Vinzenz
Hediger, project director of 鈥淜onfigurationen des Films鈥�. In that spirit, the
publication鈥檚 subtitles is 鈥淧reliminary Notes Towards an Inventory鈥�.
鈥淧andemic Media鈥� brings together 37 contributions
from the scientific network of 鈥淜onfiguration des Films鈥� 鈥� a network that is
truly global. Contributors include researchers working at universities in New
York, Stanford, Toronto, Seattle, Oxford, London, Lagos, Utrecht, Frankfurt,
Weimar or Paris. The diversity of the contributors is reflected in the variety
of their topics and perspectives: These include the now ubiquitous drone
images, the split-screen aesthetics of video conferencing software, dating
apps, Trump鈥檚 television strategy against COVID, visualisations of the virus or
the development and implementation of the COVID tracing app in Germany.
The publication鈥檚 cover is based on the
current work of MAGNUM photographer Antoine D鈥橝gata, who has been documenting
the impact of the pandemic in Paris streets and hospitals with a heat sensor
camera. D鈥橝gata鈥檚 eerily suggestive images, which are on display at the
Brownstone Foundation in Paris until the end of October, are also the subject
of one the contributions to the volume.
Among 鈥淧andemic Media鈥濃�榮 innovations is
the digital open access publication strategy, which allowed the editors to put
the project in the short space of four months.
All contributions underwent a two-step double blind peer review process.
The project director of 鈥淜onfigurationen des Films鈥� and Professor Antonio
Somaini, who teaches at Universit茅 Paris-3 and is also a partner of Goethe
University in the International Master Cinema Studies (IMACS, www.imacsite.net)
serve as co-editors.
The publication date for the 37
contributions and the introduction is 28 October 2020. 鈥淧andemic Media鈥� is the
latest volume in the 鈥濩onfigurations of film鈥� series published by meson press.
The full publication can be accessed here: , first in html format, later as PDF files
for download. The publication will be available in book form in time for the
holidays.
Meson press is an innovative new publisher
specializing in open access publications on digital media culture. 鈥淔rom our
point of view, 鈥楶andemic Media鈥� is an exciting pilot project鈥�, comments Andreas
Kirchner, co-founder and co-director of meson press. 鈥淣ot only does the volume
perfectly fit our profile, it offers us an opportunity to experiment with
groundbreaking new publication formats.鈥�
The Graduate Research Training Program
鈥淜onfigurationen des Films鈥�, which is funded by the Deutsche
Forschungsgemeinschaft (DFG), has been studying the digital transformation of
film culture since 2017. This summer, the second cohort of 12 doctoral
candidates has assumed their positions and started their research projects.
Publication:
鈥濸andemic Media. Preliminary Notes Towards an Inventory鈥�, published by Vinzenz
Hediger, Philipp Keidl, Laliv Melamed und Antonio Somaini
Images
to download:
Caption:
The temperature of the pandemic: The book cover is based on a photo by Magnum
photographer Antoine D鈥橝gata, who has been documenting Parisian street scenes
and processes in hospitals with a heat-sensitive camera since April (Foto:
Cover (c) meson press/Mathias B盲r/Antoine D鈥橝gata)
Further information:
Dr.
Philipp Keidl
Graduate
Research Training Program 鈥濳onfigurationen des Films鈥�
keidl@em.uni-frankfurt.de
Dr.
Laliv Melamed,
Graduate
Research Training Program 鈥濳onfigurationen des Films鈥�
melamed@tfm.uni-frankfurt.de
Prof. Dr. Vinzenz
Hediger
Speaker
of the Graduate Research Training Program 鈥濳onfigurationen des Films鈥�
hediger@tfm.uni-frankfurt.de
Oct
16
2020
10:06
鈥婸hysicists from Frankfurt, Hamburg and Berlin track the propagation of light in a molecule
Zeptoseconds: New world record in short time measurement
In the global race to measure ever shorter time spans, physicists from 51猎奇 Frankfurt have now taken the lead: together with colleagues at the accelerator facility DESY in Hamburg and the Fritz-Haber-Institute in Berlin, they have measured a process that lies within the realm of zeptoseconds for the first time: the propagation of light within a molecule. A zeptosecond is a trillionth of a billionth of a second (10-21 seconds).
FRANKFURT. In 1999, the Egyptian chemist Ahmed Zewail received the Nobel Prize for measuring the speed at which molecules change their shape. He founded femtochemistry using ultrashort laser flashes: the formation and breakup of chemical bonds occurs in the realm of femtoseconds. A femtosecond equals 0.000000000000001 seconds, or 10-15 seconds.
Now atomic physicists at 51猎奇 in Professor Reinhard D枚rner's team have for the first time studied a process that is shorter than femtoseconds by magnitudes. They measured how long it takes for a photon to cross a hydrogen molecule: about 247 zeptoseconds for the average bond length of the molecule. This is the shortest timespan that has been successfully measured to date.
The scientists carried out the time measurement on a hydrogen molecule (H2) which they irradiated with X-rays from the synchrotron lightsource PETRA III at the Hamburg accelerator centre DESY. The researchers set the energy of the X-rays so that one photon was sufficient to eject both electrons out of the hydrogen molecule.
Electrons behave like particles and waves simultaneously, and therefore the ejection of the first electron resulted in electron waves launched first in the one, and then in the second hydrogen molecule atom in quick succession, with the waves merging.
The photon behaved here much like a flat pebble that is skimmed twice across the water: when a wave trough meets a wave crest, the waves of the first and second water contact cancel each other, resulting in what is called an interference pattern.
The scientists measured the interference pattern of the first ejected electron using the COLTRIMS reaction microscope, an apparatus that D枚rner helped develop and which makes ultrafast reaction processes in atoms and molecules visible. Simultaneously with the interference pattern, the COLTRIMS reactions microscope also allowed the determination of the orientation of the hydrogen molecule. The researchers here took advantage of the fact that the second electron also left the hydrogen molecule, so that the remaining hydrogen nuclei flew apart and were detected.
鈥淪ince we knew the spatial orientation of the hydrogen molecule, we used the interference of the two electron waves to precisely calculate when the photon reached the first and when it reached the second hydrogen atom," explains Sven Grundmann whose doctoral dissertation forms the basis of the scientific article in Science. 鈥淎nd this is up to 247 zeptoseconds, depending on how far apart in the molecule the two atoms were from the perspective of light."
Professor Reinhard D枚rner adds: 鈥淲e observed for the first time that the electron shell in a molecule does not react to light everywhere at the same time. The time delay occurs because information within the molecule only spreads at the speed of light. With this finding we have extended our COLTRIMS technology to another application."
Publication: Sven Grundmann, Daniel Trabert, Kilian Fehre, Nico Strenger, Andreas Pier, Leon Kaiser, Max Kircher, Miriam Weller, Sebastian Eckart, Lothar Ph. H. Schmidt, Florian Trinter, Till Jahnke, Markus S. Sch枚ffler, Reinhard D枚rner: Zeptosecond Birth Time Delay in Molecular Photoionization. Science
Image download:
Caption: Schematic representation of zeptosecond measurement. The photon (yellow, coming from the left) produces electron waves out of the electron cloud (grey) of the hydrogen molecule (red: nucleus), which interfere with each other (interference pattern: violet-white). The interference pattern is slightly skewed to the right, allowing the calculation of how long the photon required to get from one atom to the next. Photo: Sven Grundmann, 51猎奇 Frankfurt
Further information:
Prof. Dr. Reinhard D枚rner
Institute for Atomic Physics
Telephone +49 69 798 47003
doerner@atom.uni-frankfurt.de
FRANKFURT. In 1999, the Egyptian chemist Ahmed Zewail received the Nobel Prize for measuring the speed at which molecules change their shape. He founded femtochemistry using ultrashort laser flashes: the formation and breakup of chemical bonds occurs in the realm of femtoseconds. A femtosecond equals 0.000000000000001 seconds, or 10-15 seconds.
Now atomic physicists at 51猎奇 in Professor Reinhard D枚rner's team have for the first time studied a process that is shorter than femtoseconds by magnitudes. They measured how long it takes for a photon to cross a hydrogen molecule: about 247 zeptoseconds for the average bond length of the molecule. This is the shortest timespan that has been successfully measured to date.
The scientists carried out the time measurement on a hydrogen molecule (H2) which they irradiated with X-rays from the synchrotron lightsource PETRA III at the Hamburg accelerator centre DESY. The researchers set the energy of the X-rays so that one photon was sufficient to eject both electrons out of the hydrogen molecule.
Electrons behave like particles and waves simultaneously, and therefore the ejection of the first electron resulted in electron waves launched first in the one, and then in the second hydrogen molecule atom in quick succession, with the waves merging.
The photon behaved here much like a flat pebble that is skimmed twice across the water: when a wave trough meets a wave crest, the waves of the first and second water contact cancel each other, resulting in what is called an interference pattern.
The scientists measured the interference pattern of the first ejected electron using the COLTRIMS reaction microscope, an apparatus that D枚rner helped develop and which makes ultrafast reaction processes in atoms and molecules visible. Simultaneously with the interference pattern, the COLTRIMS reactions microscope also allowed the determination of the orientation of the hydrogen molecule. The researchers here took advantage of the fact that the second electron also left the hydrogen molecule, so that the remaining hydrogen nuclei flew apart and were detected.
鈥淪ince we knew the spatial orientation of the hydrogen molecule, we used the interference of the two electron waves to precisely calculate when the photon reached the first and when it reached the second hydrogen atom," explains Sven Grundmann whose doctoral dissertation forms the basis of the scientific article in Science. 鈥淎nd this is up to 247 zeptoseconds, depending on how far apart in the molecule the two atoms were from the perspective of light."
Professor Reinhard D枚rner adds: 鈥淲e observed for the first time that the electron shell in a molecule does not react to light everywhere at the same time. The time delay occurs because information within the molecule only spreads at the speed of light. With this finding we have extended our COLTRIMS technology to another application."
Publication: Sven Grundmann, Daniel Trabert, Kilian Fehre, Nico Strenger, Andreas Pier, Leon Kaiser, Max Kircher, Miriam Weller, Sebastian Eckart, Lothar Ph. H. Schmidt, Florian Trinter, Till Jahnke, Markus S. Sch枚ffler, Reinhard D枚rner: Zeptosecond Birth Time Delay in Molecular Photoionization. Science
Image download:
Caption: Schematic representation of zeptosecond measurement. The photon (yellow, coming from the left) produces electron waves out of the electron cloud (grey) of the hydrogen molecule (red: nucleus), which interfere with each other (interference pattern: violet-white). The interference pattern is slightly skewed to the right, allowing the calculation of how long the photon required to get from one atom to the next. Photo: Sven Grundmann, 51猎奇 Frankfurt
Further information:
Prof. Dr. Reinhard D枚rner
Institute for Atomic Physics
Telephone +49 69 798 47003
doerner@atom.uni-frankfurt.de
Oct
14
2020
14:16
Three-year German-American project studies biology of LRRK2聽
51猎奇 partner in US$ 7.2 million research project on Parkinson鈥檚 disease
FRANKFURT. About ten percent of Parkinson's cases can be ascribed to mutations in the LRRK2 gene. Five research teams from the University of California in San Diego, 51猎奇 Frankfurt and the University of Konstanz want to explain in the next few years how mutations in the LRRK2 gene trigger Parkinson's disease and what possible targets there are for drugs. The US-American initiative 鈥淎ligning Science Across Parkinson's" has made the equivalent of 鈧� 6.1 million available for this project.
In the early 2000s, it was discovered that
in many Parkinson's patients a certain enzyme called LRRK2 mutates and
evidently plays a significant role in five to ten percent of hereditary Morbus
Parkinson and between one and five percent of the spontaneous form. LRRK2 is an
enzyme that attaches phosphate groups to other proteins in the human cell and
is far more active than normal in the brain cells of Parkinson's patients,
leading it to block transport processes in the cell. Many inhibitors against
the LRRK2 enzyme have already been tested in the past, but they are not
sufficiently effective or their side-effects are too severe.
The five teams from USA and Germany want
now to elucidate in detail the enzyme's structure and how it works in the cell
and thus create a basis for the targeted production of inhibitors. A first
three-dimensional structure of the LRRK2 protein was recently published by the
research team in the journal Nature. The initiative 鈥淎ligning Science
Across Parkinson's", which is backed by The Michael J. Fox Foundation for
Parkinson's Research, is supporting the project financially.
Co-Project Manager Stefan Knapp, Professor
for Pharmaceutical Chemistry at 51猎奇, explains: 鈥淏y comparing
LRRK2 mutations in Parkinson's patients with normal LRRK2, we want to find out
which tasks LRRK2 assumes in the cell, how the enzyme moves three-dimensionally,
and how the mutated LRRK2 contributes to nerve cells dying off. While the
expertise of our colleagues in the USA lies in various imaging methods, here in
Frankfurt we'll develop chemical probes to localize and study LRRK2 in cells
and we will produce recombinant LRRK2 variants that will help us to understand
their three-dimensional structure."
Co-Project Manager Florian Stengel, Professor
for Cellular Proteostasis at the University of Konstanz, says: 鈥淚n the
framework of this project, we here in Konstanz want to identify the cellular
interaction partners of LRRK2. In this way, we'll be able to complete our
picture of its cellular role and thus make it possible to develop a drug
against LRRK2 mutated Morbus Parkinson."
Article
on the first three-dimensional structure of the LKKR2 protein: C K Deniston, J Salogiannis, S Mathea, D M
Snead, I Lahiri, M Matyszewski, O Donosa, R Watanabe, J B枚hning, A K Shiau, S
Knapp, E Villa, S L Reck-Peterson, A E Leschziner. Structure of LRRK2 in
Parkinson's disease and model for microtubule interaction. Nature. 2020 Aug 19
Pictures
to download:
Caption:
Professor Stefan Knapp, Institute of
Pharmaceutical Chemistry, 51猎奇, Frankfurt (Foto: Uwe Dettmar)
Further
information:
Professor Stefan Knapp
Institute of Pharmaceutical Chemistry
51猎奇 Frankfurt
Phone: +49 69 798-29871
knapp@pharmchem.uni-frankfurt.de
Professor
Florian Stengel
Department
of Biology / Laboratory of Cellular Proteostasis and Mass Spectrometry
University of Konstanz
Phone:
+49 7531 88-5172
florian.stengel@uni-konstanz.de
Oct
6
2020
14:45
鈥婼tudy by 51猎奇 shows: Particulate matter is also reduced 鈥� ventilation remains necessary because of CO2
Risk of infection: Air purifiers remove 90 percent of aerosols in school classrooms
FRANKFURT. Atmospheric researchers from 51猎奇 have demonstrated that air purifiers with a class H13 filter (HEPA) can lower aerosol concentration in a classroom by 90 percent within 30 minutes. Because this significantly reduces the risk of airborne infection with SARS-CoV-2, the scientists recommend placing such air purifiers in classrooms. In most cases, students and teachers did not find the noise made by the purifier disturbing. The study is now available as a preprint, prior to appearing in a scientific journal. ()
The most dangerous route to an infection with SARS-CoV-2 is via the air: For example, when infected persons sneeze or cough, they catapult relatively large droplets which, however, sink to the ground within a radius of two metres. Important are also aerosols, much smaller droplets, which we emit when speaking or breathing. Studies show that infectious SARS-CoV-2 pathogens can still be detected in such aerosols over three hours after emission and several metres away from an infected person. The fluid in such aerosol particles evaporates quickly, making them smaller and able to disperse in a room within a few minutes.
Together with his team, Joachim Curtius, Professor for Experimental Atmospheric Research at 51猎奇, tested four air purifiers in a classroom with 27 students and their teachers over a period of a week. The purifiers had a simple prefilter for coarse dust particles and fluff as well as HEPA and active carbon filters. Together, the filters processed between 760 and 1,460 m3 of air per hour. Apart from aerosol load, the researchers also measured the volume of fine dust particles and CO2 concentration and analysed the noise levels caused by the device. The result: Half an hour after switching it on, the air purifiers had removed 90 percent of the aerosols from the air.
Professor Curtius explains: 鈥淥n the basis of our measurement data, we've calculated a model that allows the following estimate: An air purifier lowers the amount of aerosols to such a considerable degree that the risk of being infected by a highly contagious person, a superspreader, is greatly reduced. That's why we're recommending that schools use HEPA air purifiers this winter with a sufficiently high air flow rate."
Noise measurements and a survey among students and teachers revealed that in most cases the noise made by the air purifier was not considered disturbing, provided that the appliance was not running at the highest level.
The researchers also measured that the air purifier 鈥� apart from lowering the risk of infection 鈥揳dditionally reduced allergens and fine dust particles (PM10). Joachim Curtius: 鈥淎n air filter does not, however, replace opening the window at regular intervals, which is important for decreasing CO2 concentration in the room. Our measurements in the classrooms showed that levels often exceeded the recommended limits. Here, we recommend installing CO2 sensors so that students and teachers can monitor this themselves."
Publication: Joachim Curtius, Manuel Granzin, Jann Schrod: Testing mobile air purifiers in a school classroom: Reducing the airborne transmission risk for SARS鈥怌oV鈥�2. Preprint: medRxiv 2020.10.02.20205633; doi:
Further information:
Professor Dr. Joachim Curtius
Institute for Atmospheric and Environmental Sciences
51猎奇
Tel.: +49 69 798-40258
curtius@iau.uni-frankfurt.de
The most dangerous route to an infection with SARS-CoV-2 is via the air: For example, when infected persons sneeze or cough, they catapult relatively large droplets which, however, sink to the ground within a radius of two metres. Important are also aerosols, much smaller droplets, which we emit when speaking or breathing. Studies show that infectious SARS-CoV-2 pathogens can still be detected in such aerosols over three hours after emission and several metres away from an infected person. The fluid in such aerosol particles evaporates quickly, making them smaller and able to disperse in a room within a few minutes.
Together with his team, Joachim Curtius, Professor for Experimental Atmospheric Research at 51猎奇, tested four air purifiers in a classroom with 27 students and their teachers over a period of a week. The purifiers had a simple prefilter for coarse dust particles and fluff as well as HEPA and active carbon filters. Together, the filters processed between 760 and 1,460 m3 of air per hour. Apart from aerosol load, the researchers also measured the volume of fine dust particles and CO2 concentration and analysed the noise levels caused by the device. The result: Half an hour after switching it on, the air purifiers had removed 90 percent of the aerosols from the air.
Professor Curtius explains: 鈥淥n the basis of our measurement data, we've calculated a model that allows the following estimate: An air purifier lowers the amount of aerosols to such a considerable degree that the risk of being infected by a highly contagious person, a superspreader, is greatly reduced. That's why we're recommending that schools use HEPA air purifiers this winter with a sufficiently high air flow rate."
Noise measurements and a survey among students and teachers revealed that in most cases the noise made by the air purifier was not considered disturbing, provided that the appliance was not running at the highest level.
The researchers also measured that the air purifier 鈥� apart from lowering the risk of infection 鈥揳dditionally reduced allergens and fine dust particles (PM10). Joachim Curtius: 鈥淎n air filter does not, however, replace opening the window at regular intervals, which is important for decreasing CO2 concentration in the room. Our measurements in the classrooms showed that levels often exceeded the recommended limits. Here, we recommend installing CO2 sensors so that students and teachers can monitor this themselves."
Publication: Joachim Curtius, Manuel Granzin, Jann Schrod: Testing mobile air purifiers in a school classroom: Reducing the airborne transmission risk for SARS鈥怌oV鈥�2. Preprint: medRxiv 2020.10.02.20205633; doi:
Further information:
Professor Dr. Joachim Curtius
Institute for Atmospheric and Environmental Sciences
51猎奇
Tel.: +49 69 798-40258
curtius@iau.uni-frankfurt.de
Sep
29
2020
14:28
鈥婭nternational research team solves theory of how diamonds formed inside protoplanets
Geoscience: Cosmic diamonds formed during gigantic planetary collisions
FRANKFURT. Geoscientists from 51猎奇 have found the largest extraterrestrial diamonds ever discovered 鈥� a few tenths of a millimetre in size nevertheless 鈥� inside meteorites. Together with an international team of researchers, they have now been able to prove that these diamonds formed in the early period of our solar system when minor planets collided together or with large asteroids. These new data disprove the theory that they originated deep inside planets 鈥� similar to diamonds formed on Earth - at least the size of Mercury. (PNAS, https://www.pnas.org/content/early/2020/09/22/1919067117)
It is estimated that over 10 million asteroids are circling the Earth in the asteroid belt. They are relics from the early days of our solar system, when our planets formed out of a large cloud of gas and dust rotating around the sun. When asteroids are cast out of orbit, they sometimes plummet towards Earth as meteoroids. If they are big enough, they do not burn up completely when entering the atmosphere and can be found as meteorites. The geoscientific study of such meteorites makes it possible to draw conclusions not only about the evolution and development of planets in the solar system but also their extinction.
A special type of meteorites are ureilites. These are fragments of a larger celestial body 鈥� probably a minor planet 鈥� which was smashed to pieces through violent collisions with other minor planets or large asteroids. Ureilites often contain large quantities of carbon, among others in the form of graphite or nanodiamonds. The diamonds on the scale of over 0.1 and more millimetres now discovered cannot have formed when the meteoroids hit the Earth. Impact events with such vast energies would make the meteoroids evaporate completely. That is why it was so far assumed that these larger diamonds 鈥� similar to those in the Earth's interior 鈥� must have been formed by continuous pressure in the interior of planetary precursors the size of Mars or Mercury.
Together with scientists from Italy, the USA, Russia, Saudi Arabia, Switzerland and the Sudan, researchers from 51猎奇 have now found the largest diamonds ever discovered in ureilites from Morocco and the Sudan and analysed them in detail. Apart from the diamonds of up to several 100 micrometres in size, numerous nests of diamonds on just nanometre scale as well as nanographite were found in the ureilites. Closer analyses showed that what are known as londsdalite layers exist in the nanodiamonds, a modification of diamonds that only occurs through sudden, very high pressure. Moreover, other minerals (silicates) in the ureilite rocks under examination displayed typical signs of shock pressure. In the end, it was the presence of these larger diamonds together with nanodiamonds and nanographite that led to the breakthrough.
Professor Frank Brenker from the Department of Geosciences at 51猎奇 explains:
鈥淥ur extensive new studies show that these unusual extraterrestrial diamonds formed through the immense shock pressure that occurred when a large asteroid or even minor planet smashed into the surface of the ureilite parent body. It's by all means possible that it was precisely this enormous impact that ultimately led to the complete destruction of the minor planet. This means 鈥� contrary to prior assumptions 鈥� that the larger ureilite diamonds are not a sign that protoplanets the size of Mars or Mercury existed in the early period of our solar system, but nonetheless of the immense, destructive forces that prevailed at that time."
The international research team comprises scientists from the following institutions:
Department of Geosciences, University of Padova, Italy
Department of Geosciences, 51猎奇, Frankfurt, Germany
Lunar and Planetary Institute, USRA, Houston, Texas, USA
Department of Earth and Environmental Sciences, University of Pavia, Italy
Astromaterials Research and Exploration Science Division, Jacobs JETS, Johnson Space Center, NASA, Houston, Texas, USA
CNR Institute of Geosciences and Earth Resources, Padua, Italy
Vereshchagin Institute for High Pressure Physics RAS, Troitsk, Moscow, Russia
NASA Astromaterials Acquisition and Curation Office, Johnson Space Center, NASA, Houston, Texas, USA
Department of Civil, Environmental and Mechanical Engineering, University of Trento, Italy
Saudi Aramco R&D Center, Dhahran, Saudi Arabia
Swiss Light Source, Paul Scherrer Institute, Villigen, Switzerland
SETI Institute, Mountain View, California, USA
Department of Physics and Astronomy, University of Khartoum, Khartoum, Sudan
Publication: Fabrizio Nestola, Cyrena A. Goodrich, Marta Morana, Anna Barbaro, Ryan S. Jakubek, Oliver Christ, Frank E. Brenker, Maria C. Domeneghetti, Maria C. Dalconi, Matteo Alvaro, Anna M. Fioretti, Konstantin Litasov, Marc D. Fries, Matteo Leoni, Nicola P. M. Casati, Peter Jenniskens, Muawia H. Shaddad: Impact shock origin of diamonds in ureilite meteorites. Proceedings of the National Academy of Science
Images to download:
Picture1: Planetary collision
Caption: Artist's impression of the collision of two protoplanets. Credits: NASA/SOFIA/Lynette Cook
Picture2: Rock sample from ureilite minor planet
Caption: Photo of a rock sample from the ureilite minor planet, found as a meteorite in the Sahara. Length of the fragments about 2cm. Credits: Oliver Christ
Picture3: Colour coded Raman spectroscopic map of the ureilite studied. diamond (red), graphite (blue). Credits: Cyrena Goodrich
Further information:
Professor Frank E. Brenker
Department of Geosciences / NanoGeoscience
51猎奇
Tel: +49 69 798 40134
f.brenker@em.uni-frankfurt.de
It is estimated that over 10 million asteroids are circling the Earth in the asteroid belt. They are relics from the early days of our solar system, when our planets formed out of a large cloud of gas and dust rotating around the sun. When asteroids are cast out of orbit, they sometimes plummet towards Earth as meteoroids. If they are big enough, they do not burn up completely when entering the atmosphere and can be found as meteorites. The geoscientific study of such meteorites makes it possible to draw conclusions not only about the evolution and development of planets in the solar system but also their extinction.
A special type of meteorites are ureilites. These are fragments of a larger celestial body 鈥� probably a minor planet 鈥� which was smashed to pieces through violent collisions with other minor planets or large asteroids. Ureilites often contain large quantities of carbon, among others in the form of graphite or nanodiamonds. The diamonds on the scale of over 0.1 and more millimetres now discovered cannot have formed when the meteoroids hit the Earth. Impact events with such vast energies would make the meteoroids evaporate completely. That is why it was so far assumed that these larger diamonds 鈥� similar to those in the Earth's interior 鈥� must have been formed by continuous pressure in the interior of planetary precursors the size of Mars or Mercury.
Together with scientists from Italy, the USA, Russia, Saudi Arabia, Switzerland and the Sudan, researchers from 51猎奇 have now found the largest diamonds ever discovered in ureilites from Morocco and the Sudan and analysed them in detail. Apart from the diamonds of up to several 100 micrometres in size, numerous nests of diamonds on just nanometre scale as well as nanographite were found in the ureilites. Closer analyses showed that what are known as londsdalite layers exist in the nanodiamonds, a modification of diamonds that only occurs through sudden, very high pressure. Moreover, other minerals (silicates) in the ureilite rocks under examination displayed typical signs of shock pressure. In the end, it was the presence of these larger diamonds together with nanodiamonds and nanographite that led to the breakthrough.
Professor Frank Brenker from the Department of Geosciences at 51猎奇 explains:
鈥淥ur extensive new studies show that these unusual extraterrestrial diamonds formed through the immense shock pressure that occurred when a large asteroid or even minor planet smashed into the surface of the ureilite parent body. It's by all means possible that it was precisely this enormous impact that ultimately led to the complete destruction of the minor planet. This means 鈥� contrary to prior assumptions 鈥� that the larger ureilite diamonds are not a sign that protoplanets the size of Mars or Mercury existed in the early period of our solar system, but nonetheless of the immense, destructive forces that prevailed at that time."
The international research team comprises scientists from the following institutions:
Department of Geosciences, University of Padova, Italy
Department of Geosciences, 51猎奇, Frankfurt, Germany
Lunar and Planetary Institute, USRA, Houston, Texas, USA
Department of Earth and Environmental Sciences, University of Pavia, Italy
Astromaterials Research and Exploration Science Division, Jacobs JETS, Johnson Space Center, NASA, Houston, Texas, USA
CNR Institute of Geosciences and Earth Resources, Padua, Italy
Vereshchagin Institute for High Pressure Physics RAS, Troitsk, Moscow, Russia
NASA Astromaterials Acquisition and Curation Office, Johnson Space Center, NASA, Houston, Texas, USA
Department of Civil, Environmental and Mechanical Engineering, University of Trento, Italy
Saudi Aramco R&D Center, Dhahran, Saudi Arabia
Swiss Light Source, Paul Scherrer Institute, Villigen, Switzerland
SETI Institute, Mountain View, California, USA
Department of Physics and Astronomy, University of Khartoum, Khartoum, Sudan
Publication: Fabrizio Nestola, Cyrena A. Goodrich, Marta Morana, Anna Barbaro, Ryan S. Jakubek, Oliver Christ, Frank E. Brenker, Maria C. Domeneghetti, Maria C. Dalconi, Matteo Alvaro, Anna M. Fioretti, Konstantin Litasov, Marc D. Fries, Matteo Leoni, Nicola P. M. Casati, Peter Jenniskens, Muawia H. Shaddad: Impact shock origin of diamonds in ureilite meteorites. Proceedings of the National Academy of Science
Images to download:
Picture1: Planetary collision
Caption: Artist's impression of the collision of two protoplanets. Credits: NASA/SOFIA/Lynette Cook
Picture2: Rock sample from ureilite minor planet
Caption: Photo of a rock sample from the ureilite minor planet, found as a meteorite in the Sahara. Length of the fragments about 2cm. Credits: Oliver Christ
Picture3: Colour coded Raman spectroscopic map of the ureilite studied. diamond (red), graphite (blue). Credits: Cyrena Goodrich
Further information:
Professor Frank E. Brenker
Department of Geosciences / NanoGeoscience
51猎奇
Tel: +49 69 798 40134
f.brenker@em.uni-frankfurt.de