Rosling

Udvalgt
Five important lessons we can learn from statistician Hans Rosling
I first came across Hans Rosling's work while I was trying to make mathematics students fall in love with statistics. His TED talks are inspirational since they present data in new and dynamic ways, but not just that, they're also educational and eye-opening.

indføre proteiner i planteceller

Udvalgt
Plasmas promote protein introduction in plants
Scientists have developed a technique for introducing proteins into plant cells using plasma treatment. Their method could have multiple applications in plant research and industry.

robotbi

Udvalgt
Japanske forskere opfinder robotbi - spild af penge, mener dansk forsker
I stedet skal man give plads til insekterne, der har klaret opgaven siden dinosaurerne, fortæller han.

zink

Udvalgt
Grisene bliver fravænnet efter fire uger, og så får de zink for at undgå diarré
Danmarks produktion af små 32 millioner svin foregår så intensivt, at grisene bliver fravænnet die, før de er klar til vegetabilsk føde. Konsekvensen er dårlig mave, som bl.a. zinkoxid kan kurere.

2D

Experts investigate how order emerges from chaos
Igor Kolokolov and Vladimir Lebedev, scientific experts from HSE's Faculty of Physics and the Landau Institute for Theoretical Physics of Russian Academy of Sciences, have developed an analytical theory binding the structure of coherent vortices formed due to inverse cascades in 2-D turbulence with the statistical properties of hydrodynamic fluctuations. Uncovering this link could be useful in ide

actin

Image: Valentine-shaped mouse skin cancer cells connected with actin protein
This heart-shaped image shows two mouse skin cancer cells connected to each other with actin, a protein that is part of the cellular skeleton. Researchers use mouse cells like these to tease out the molecular methods that cancer employs to invade new tissues in the body. It turns out that actin plays an essential role.

actin

Heart-shaped cells
The cellular skeleton protein actin can bind cells together, and also play a number of roles in cancer's invasion into new tissues in the body.

astronomi

Scientists make huge dataset of nearby stars available to public
The search for planets beyond our solar system is about to gain some new recruits.

atombomber og måneklipper

What Our 1st Nuclear Test Left Behind Is a Lot Like Moon Rocks. Hm.
A study of the zinc left behind at a plutonium blast site shows that it’s identical to what’s in moon rocks, supporting the idea of an explosive lunar origin. .

bedøvelse

Danske anæstesi­læger i åben krig mod FDA
Dansk Selskab for Anæstesiologi og Intensiv Medicin afviser advarsel fra de amerikanske sundhedsmyndigheder.

Brefeldin A

Researchers derive pharmaceutical from natural sources by synthesizing processes and catalysts
Once they can synthesise molecules of active natural substances, scientists will be able to harness nature's medicine cabinet for the drugs of the future. By testing newly developed synthesising processes and catalysts, a project funded by the Austrian Science Fund FWF managed to produce the promising natural substance Brefeldin A faster and in larger quantities.

byfarme

Højteknologisk landbrug: Fremtidens mad spirer på storbyens urbane farme
Rundt om i verdens storbyer skyder plantefabrikker op med avancerede teknologier til at brødføde byboere. Nu spirer det også herhjemme.

chili

This Heatless Habanero Packs All Of The Flavor With None Of The Burn
Some breeders vie to grow ever more mouth-burning peppers. The guy behind the Habanada had a different goal: a habanero with no heat all. The aromatic, melon-like result is winning over top chefs. (Image credit: Courtesy of Blue Hill)

cobalt i blod af skildpadder

High metal levels found in Queensland turtle blood
Cobalt, a naturally occurring mineral that can also be an environmental pollutant, has been recorded in the blood of Queensland turtles at potentially harmful levels

computere der bruger mindre energi

The ultimate green technology: Creating computers that use 10,000 times less energy
Imagine patterning and visualizing silicon at the atomic level, something which, if done successfully, will revolutionize the quantum and classical computing industry. A team of scientists in Edmonton, Canada has done just that, led by a world-renowned physicist and his up-and-coming protégé.

connectom

Diversity of meso-scale architecture in human and non-human connectomes
The brain's functional diversity is reflected in the meso-scale architecture of its connectome, i.e. its division into clusters and communities of topologically-related brain regions. The dominant view, and one that is reinforced by current analysis techniques, is that communities are strictly assortative and segregated from one another, purportedly for the purpose of carrying out specialized info

cyperkriminalitet

Teleselskabet 3 afpresses: It-kriminelle hævder at have tappet tusindvis af kunders CPR
https://www.version2.dk/artikel/it-kriminelle-haevder-at-have-tappet-tusindvis-kundedata-hos-teleselskabet-3-moedt-1073375 Teleselskabet 3 bliver pt. afpresset af kriminelle, der kræver et større millionbeløb for ikke at udlevere CPR, navn og adresse på ca. 3.600 kunder. 3 har overdraget sagen til politiet. Version2

delfiiner

Help to save rare humpback dolphins
Flinders researchers have confirmed the importance of the remote Ningaloo Reef as a conservation site of significance for the rare and secretive Australian humpback dolphin.

depression

Caregivers need help dealing with depression
There are more than 34 million people in the US who care for terminally ill loved ones, but few resources are available to help them navigate the challenges they encounter. A new study published in the Journal of Palliative Medicine finds that nearly one-quarter of caregivers are moderately or severely depressed and nearly one-third have moderate or severe anxiety. Researchers recommend that heal

depression hos piger

Depression Strikes Today's Teen Girls Especially Hard
A study tracking depression rates among U.S. teens from 2005 to 2014 finds an increase — especially among girls. A steady diet of harsh judgements from social media may play a role, researchers say. (Image credit: Nicole Xu for NPR)

DNA-reparation

DNA repair—a new letter in the cell alphabet
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send "repair-proteins" to the damaged parts within the DNA. To do this, an elaborate protein language has evolved. Now scientists from the Max Planck Institute for Biology of Ageing in Cologne have discovered the way a new letter of this alphabet is used in cells.

energisystem

Using new archaeological techniques to uncover more about our past
Bournemouth University researchers are using new archaeological techniques and technologies to learn more about an iconic Islamic palace in Southern Spain.

evolution

How evolution alters biological invasions
Biological invasions pose major threats to biodiversity, but little is known about how evolution might alter their impacts over time.

farver af blomster

Roses are red, violets are blue—what gives flowers those eye-catching hues?
To solve the mystery of why roses are red and violets are blue, scientists are peering into the genes of plant petals.

flagermus

Ohio critics hope bats might slow down pipeline project
Opponents of a high-pressure natural gas pipeline expected to be built across the northern half of Ohio are clinging to the wings of a furry flier, the northern long-eared bat, in their efforts to at least delay the $2 billion project.

fugle: rød glente i Danmark

Kæmpe rovfugl vender stærkt tilbage til Danmark
Med et vingefang på halvanden meter er den røde glente én af Danmarks største rovfugle. I januar blev der spottet et rekord-antal.

fugleinfluenza

Some China cities close poultry markets amid bird flu fears
Several Chinese cities have shut down their poultry markets in the wake of a bird flu outbreak that has killed at least two dozen people this year across China.

fusion

Physicists improve method for designing fusion experiments
"Measure twice, cut once" is an old carpenter's proverb—a reminder that careful planning can save time and materials in the long run.

grafen

A new platform to study graphene's electronic properties
Graphene's unusual electronic structure enables this extraordinary material to break many records of strength, electricity and heat conduction. Physicists at the Center for Theoretical Physics of Complex Systems (PCS), in collaboration with the Research Institute for Standards and Science (KRISS), used a model to explain the electronic structure of graphene measured by a new spectroscopic platform

happyness

Science: How to Get into the "Flow" and Do What Makes You Happiest
Researchers study the "paradox of happiness" to find out how get into "flow activities" that would make us happiest. .

hash på recept i Sverige

To patienter får for første gang cannabis på recept i Sverige
To svenske patienter med stærke nervesmerter kan nu få medicinsk cannabis på recept. Herhjemme starter et forsøg med cannabis på recept til januar næste år - og første danske producent af medicinsk cannabis er klar med høst i august.

havbundens organiske stof

Low bottom-water oxygen leads to more organic matter ending up on the seafloor
Periodic oscillations of bottom-water oxygen concentrations can alter benthic communities and carbon storage for decades, reveals a new study published in Science Advances. This is particularly relevant as low oxygen conditions are on the rise in the world's oceans.

hestes evolution

How the horse can help us answer one of evolution's biggest questions
For 600m years, life has been responding to our changing world. Virtually every conceivable environment in every corner of the planet has been occupied as animals and plants have diversified. Environmental shifts and mass extinctions produce new evolutionary opportunities for organisms to exploit as they compete for survival.

hjerneskade

Studies uncover long-term effects of traumatic brain injury
Doctors are beginning to get answers to the question that every parent whose child has had a traumatic brain injury wants to know: What will my child be like 10 years from now?

hukommelsestab

What amnesiac patients can tell us about how memories are made
submitted by /u/amykhar [link] [comments]

hunde donerer blod

Scientists uncover huge reservoir of melting carbon under Western United States
New research published in Earth and Planetary Science Letters describes how scientists have used the world's largest array of seismic sensors to map a deep-Earth area of melting carbon covering 1.8 million square kilometres. Situated under the Western US, 350km beneath the Earth's surface, the discovered melting region challenges accepted understanding of how much carbon the Earth contains – much

hydra regeneration

ScienceTake: How a Little Bit of Hydra Regrows a Whole Animal
A protein scaffold in the body of the hydra, a tiny predator, helps it regenerate a whole animal from even a small piece.

hydra regeneration

Growth Secrets of the Hydra
The tiny hydra, a relative of jellyfish and a favorite in school biology labs, can regrow a whole animal from a piece, partly because even small remnants contain part of a protein scaffold that guides development.

indkapslng af medicin

Corn, milk proteins make medicine easier to swallow
It’s all about the layers, say scientists. Encapsulating a drug in corn protein nanoparticles and then covering with them milk protein can make children’s medications better tasting and safer.

kiropraktik

Corrigendum. The week in review for 02/12/2017
The week in review. Chiropractic and stroke. Integrative Medical doctors don’t trust vaccines. Death from medical marijuana. Shilajit: compost or mulch oozing from Himalayan rocks. India goes full Tuskeegee with AIDS. And more

klimaændring Australien hedebølger

Australia’s extreme heatwave is a preview of things to come
The current record-breaking heat, sparking bush fires and putting people in hospital, could be a foretaste of the new normal as climate change proceeds

klimaændringer

Humans affect Earth system more than natural forces
Humans are causing the climate to change 170 times faster than natural forces, new research co-led by The Australian National University (ANU) has found.

klimaændringer dæmningkollapsrisiko

188,000 under evacuation orders near Northern California dam
At least 188,000 people remain under evacuation orders after Northern California authorities warned an emergency spillway in the country's tallest dam was in danger of failing Sunday and unleashing uncontrolled flood waters on towns below.

klimaændringer dæmningkollapsrisiko

130.000 evakueret: Overløb ved USA's højeste dæmning risikerer at kollapse
Det næststørste vandreservoir i Californien er flydt over, og vandmasserne har borteroderet en del af overløbsbygværkerne. Cirka 130.000 beboere er i gang med at evakuere, og et nyt regnvejr er på vej.

kometjagt

Comet's trip past Earth offers first in a trio of opportunities
Comet hunters still have a chance to see comet 45P/Honda-Mrkos-Pajdušáková in the next few days using binoculars or a telescope. It's the first of a trio of comets that will—between now and the end of 2018—pass close enough to Earth for backyard observers to try to spot and for scientists to study using ground-based instruments.

kræft

Ny rapport: Bedre chancer for at overleve kræft
Mulighederne for at overleve kræft er forbedret på fire store kræftområder, og forskellen mellem regionerne er nærmest ikke-eksisterende, det er hovedkonklusionerne i en ny rapport.

kul

Nordjylland og Fyn holder fast i kulkraftværkerne
Mens alle andre danske kraftvarmeværker efterhånden ombygges til biomasse og måske reducerer elkapaciteten, har hverken Nordjyllandsværket eller Fynsværket planer om at sige farvel til kullene.

Larsen is

The Break in the Larsen Ice Shelf Is Bad for the Planet, But Huge for Science
A big chunk of Antarctica's Larsen C ice shelf is about to break off into a new iceberg. This group of scientists is ready to capture every gruesome detail.

liv i mørke

Mismatched eyes help squid survive ocean's twilight zone
From eyes the size of basketballs to appendages that blink and glow, deep-sea dwellers have developed some strange features to help them survive their cold, dark habitat.

livslængde

Tough early life makes wild animals live longer
Growing up in tough conditions can make wild animals live longer, new research suggests.

luftforurening

Do Car Bans Actually Mitigate Air Pollution?
Recent measures in Paris and New Delhi yield mixed results

lys til kommunikation

Researcher explores how light can solve wireless space shortage
The proliferation of wireless devices may make daily life easier, but their signals are crowding an already limited number of available radio frequencies that enable wireless communication. A University of Georgia researcher is looking to make the most of the spectrum by using photonics, the science of creating, detecting and maneuvering light.

lyspulser

New record achieved in terahertz pulse generation
A group of scientists from TU Wien and ETH Zurich have succeeded in their attempts to generate ultrashort terahertz light pulses. With lengths of just a few picoseconds, these pulses are ideally suited to spectroscopic applications and enable extremely precise frequency measurements to be taken.

muskusokser og biolog i isbjørnedragt

Scientist Dons Polar Bear Costume to Stalk Musk Oxen in the Arctic
How is rapid warming in the Arctic affecting animals that are adapted to cold? A wildlife biologist is using many techniques to find out, including stalking muskoxen in a polar bear costume.

bitcoin

AI and Bitcoin Are Driving the Next Big Hedge Fund Wave
Jeffrey Tarrant believes that the hedge fund world is on the verge of a new, Silicon Valley-inspired revolution. He calls it the Third Wave.

olieudslip i Danmark

50 meter lang flænge i grundstødt skib - risiko for olieudslip i dansk farvand
Dykkere har her til formiddag fundet en flænge på 50 meter i skroget på portugisisk containerskib, der fredag aften gik på grund nord for Fyns Hoved. Der er fundet olierester i vandet ved As Vig nær Juelsminde og på stranden på Endelave.

proteiner 3D

New study shows that proteins are 'virtually' knotted
Many of the processes essential to life involve proteins - long molecules which 'fold' into three-dimensional shapes allowing them to perform their biological role.

proteiners form

50+ Year-Old Protein Volume Paradox Resolved
New research makes it possible to predict how volume for a given protein will change between the folded and unfolded state. Computations accurately predict how a protein will react to increased pressure, shed light on the inner-workings of life in the ocean depths, and may also offer insights into alien life.

robotter

'Taste-robotter' kan udføre idiot-opgaver i gamle it-systemer
https://www.version2.dk/artikel/administrative-robotter-kan-lave-idiot-opgaverne-haabloese-legacy-systemer-1073312 Administrative robotter er ofte et plaster af automatisering på it-systemer, der ikke virker. Men der er gevinster at hente, mener konsulenthus. Version2

robotter

“The Relentless Pace of Automation”
Artificial intelligence could dramatically improve the economy and aspects of everyday life, but we need to invent ways to make sure everyone benefits.

rumforskning Australien

Why it's time for Australia to launch its own space agency
Any nation that hopes to have a space program needs to be able to keep an eye on its orbiting assets at all times. This means that Australia has become a key link in the global chain of ground-based tracking stations.

sandheder og løgne

Science in the Age of Alternative Facts
In a time when many agencies and researchers are threatened, let's remember how the scientific method originated. .

smugling af arkæologiske ting

Albania stops smugglers of 230 ancient Apollonia artifacts
Albanian police say they have prevented the smuggling of 230 archaeological artifacts from ancient Apollonia and have arrested two people.

squid øje

Deep-sea squid points a big, bulging eye up and a tiny eye down
Videos reveal that the cock-eyed squid’s two contrasting eyes are adapted for entirely different hunting purposes

tog komfort

Passengers take mobile measure of comfort for railway companies
Scientists at the University of Birmingham have developed a smartphone app that allows passengers to measure ride comfort themselves using their smartphones.

Trump: antivaxers

In 2017, are antivaxers winning?
The election of Donald Trump as President has emboldened antivaxers, because they quite rightly sense that he is one of them. His inauguration as President, combined with other trends, have led observers to ask the question: Are antivaxers winning, or will 2017 be the year of the antivaxer?

Trump: forskere

Yes, Scientists Need to Fight Back
The battle for LGBT rights offers ideas about how to do it

ure

Researchers find new date for the first mass production of timepieces
New research brings the commonly accepted date for the birth of mass production of watches forwards by nearly 100 years, and, will change the way many people view the watch industry as it stands today.

vægge

The (Anthropological) Truth about Walls
From the Great Wall of China to Hadrian's Wall to the New Amsterdam Wall on Wall Street to the Wall defended by Castle Black, walls have a long-standing place in history and pop culture to defend...

ZomBees

Honeybees hijacked by parasitic fly larvae
If you've ever seen bees flying around at night, there's a good chance they're so-called "ZomBees"—honey bees whose brains are under the control of tiny fly larvae growing inside their bodies.

øjet

Miniaturized robots can be propelled through biological fluids by an enzymatic reaction or ultrasound
Nanorobots and other mini-vehicles might be able to perform important services in medicine one day – for example, by conducting remotely-controlled operations or transporting pharmaceutical agents to a desired location in the body. However, to date it has been hard to steer such micro- and nanoswimmers accurately through biological fluids such as blood, synovial fluid or the inside of the eyeball.


Pride may actually be key to our social lives
Pride served an important function in social life that led to its evolution among our foraging ancestors, argue researchers. As human emotions go, pride has earned a bad rap. Christians count it among the seven deadly sins, the ancient Greeks charged it with provoking destruction by the gods, and non-industrial peoples around the world consider it a source of bad luck. Still, some behavioral scie


Of cabbages and cows—increasing agricultural yields in Africa
Africa's food requirements, along with its population, are growing fast. Three research programmes ask how a better understanding of viruses, parasites and the spread of disease can pave the way to improving agricultural yields.


Unique study reveals dog owners' motivations for pet blood donation
A new study by researchers at the University of Nottingham's Vet School has revealed fascinating insights into the motivations of pet owners who volunteer their dog as a blood donor.


Self-Driving Cars Won’t Just Watch the World—They’ll Watch You
The more control the car has, the more it needs to know about the person sitting behind the wheel.

New material holds promise to create more flexible, efficient technologies
An organic-inorganic hybrid material may be the future for more efficient technologies that can generate electricity from either light or heat or devices that emit light from electricity.


Snapshot of Hawaii: Why NASA Is Studying Islands' Volcanoes & Reefs
Scientists are descending on the Aloha State to gain new insights into volcanic activity and coral reef health there

School vouchers bring more money to Catholic schools—but at a cost, study finds
School voucher programs, which use government funds to support students attending private schools, are rising in popularity around the United States. Today, dozens of states offer this type of program to students, and that number is expected to increase. President Donald Trump's pick for secretary of education, Betsy DeVos, is a strong advocate for these programs.


Technology puts 'touch' into long-distance relationships
Long-distance couples can share a walk, watch movies together, and even give each other a massage, using new technologies being developed in Carman Neustaedter's Simon Fraser University lab.


Ancient Pueblo Used Golden Ratio to Build the Sun Temple
A new analysis found that the ancient Southwestern Pueblo people used the golden ratio and other geometric constructs in the Sun Temple of Mesa Verde.


Volcanic Eruption May Have Plunged the Maya into a "Dark Age"
A new study of ancient ash links El Chichón eruption to a time of inexplicable cultural upheaval in Maya history

Squid Uses Mismatched Eyes to Navigate the 'Twilight Zone' | Video
The cockeyed squid (Histioteuthis heteropsis) has two mismatched eyes — one large and one tiny.


Squid Survives Ocean's 'Twilight Zone' Thanks to Its Mismatched Eyes
As its name implies, the cockeyed squid has some peculiar peepers: One is small and black, and the other is exceptionally large and yellow. Now, scientists think they know the reason for the squid's wonky eyes: They help the squid spy on prey and predator


A decade researching buying patterns of the world's poorest populations
A decade of research by a Penn State Abington professor into the consumer behavior of and marketing to some of the world's poorest residents resulted in striking findings, detailed in several academic publications.


Asteroid resembles Dungeons and Dragons dice
Radar images of asteroid 2017 BQ6 were obtained on Feb. 6 and 7 with NASA's 70-meter (230-foot) antenna at the Goldstone Deep Space Communications Complex in California. They reveal an irregular, angular-appearing asteroid about 660 feet (200 meters) in size that rotates about once every three hours. The images have resolutions as fine as 12 feet (3.75 meters) per pixel.


Report shows schools in nation's capital remain intensely segregated
The UCLA Civil Rights Project/Proyecto Derechos Civiles today released a new research report on segregation and its alternatives in Washington D.C. showing that despite the sharply increasing diversity of the nation's capital, generation after generation of African American students in Washington D.C. have attended intensely segregated schools and still do in a city with a wider racial achievement


NASA vil male himlen fuld af kunstige skyer
Skyerne skal gøre os klogere på solvinden, der b.la udløser nordlyset.


Tony Stark Has Jarvis. And Now IBM Has Havyn
What started as a father and son weekend project could change how cybersecurity works.

Forskere og virksomheder designer et helt nyt energisystem
17 centrale energiaktører fra ind- og udland går sammen om at designe et integreret, bæredygtigt energisystem, der blandt andet skal tage højde for nabolandedes udbygning med vedvarende energi.


Beijing MST Radar detection of the lower, middle and upper atmosphere
Beijing MST (Mesosphere-Stratosphere-Troposphere) Radar is one of the largest facilities within the Chinese Meridian Project, a chain of diverse ground-based remote sensing facilities for monitoring and forecasting the space environment, and is one of only two domestic MST radars. It was built by the Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS), and is located at the I


Coherence of Raman light arises from disorder
Light propagation in disordered materials is a topic of great interest for the scientific community, with applications in the fields of photonics and renewable energies and the discovery of fascinating new phenomena related to wave physics.


3 på bar bund: Kriminelle kan have fået fat i kunders hemmelige adresser
https://www.version2.dk/artikel/3-paa-bar-bund-hemmelige-adresser-kan-ogsaa-vaere-blandt-oplysninger-1073384 Teleselskabet 3 oplyser, at blandt andet kunders sim-kortnumre og hemmelige adresser kan være blandt de oplysninger, som kriminelle er i besiddelse af. Version2


Science entering a new frontier: Politics
Like many scientists, Aaron Parsons doesn't have a history of political engagement.


We need transparent trials to keep confidence in medicine
Controversies about the safety of medicines given to millions of people can’t be settled unless data is made more freely available


Heavyweight funders back central site for life-sciences preprints
Coalition of scientists and research agencies argue for a one-stop shop server.


Pattern Storage, Bifurcations and Higher-Order Correlation Structure of an Exactly Solvable Asymmetric Neural Network Model
Exactly solvable neural network models with asymmetric weights are rare, and exact solutions are available only in some mean-field approaches. In this article we find exact analytical solutions of an asymmetric spin-glass-like model of arbitrary size and we perform a complete study of its dynamical and statistical properties. The network has discrete-time evolution equations, binary firing rates a


Any other cognitive science study abroad programs like this for 2017?
submitted by /u/jackielarson [link] [comments]


Talara--Peru's Great Ice Age Tar Trap
For sticky Ice Age fossils, Talara is second only to La Brea

5 Reasons Why America Will Not Collapse Like the Roman Empire
While often compared to the Roman Empire, the United States is not likely to collapse in the same way. .

Put a Ring on It! Saturn Impresses in Stunning Valentine's Day Photos
NASA's Cassini spacecraft sends its love this Valentine's Day with photos of Saturn’s beautiful rings, moons and polar vortex.


How The New York Times Is Clawing Its Way Into the Future
The Gray Lady is embarking on an ambitious plan, inspired by the strategies of Netflix, Spotify, and HBO, to make a subscription to the Times indispensable.

Tegn abonnement på

BioNyt Videnskabens Verden (www.bionyt.dk) er Danmarks ældste populærvidenskabelige tidsskrift for naturvidenskab. Det er det eneste blad af sin art i Danmark, som er helliget international forskning inden for livsvidenskaberne.

Bladet bringer aktuelle, spændende forskningsnyheder inden for biologi, medicin og andre naturvidenskabelige områder som f.eks. klimaændringer, nanoteknologi, partikelfysik, astronomi, seksualitet, biologiske våben, ecstasy, evolutionsbiologi, kloning, fedme, søvnforskning, muligheden for liv på mars, influenzaepidemier, livets opståen osv.

Artiklerne roses for at gøre vanskeligt stof forståeligt, uden at den videnskabelige holdbarhed tabes.