Nanoparticles reveal their location via mirror SELFI
Can a mirror turn an orange into a doughnut?
(Press-News.org) Can a mirror turn an orange into a doughnut? The answer is definitely no in the real (macro) world. But at the nanoscale, a mirror can turn an "orange" shaped pattern into a "doughnut" shaped pattern by overlapping the "orange" with its reflected mirror image.
A team of researchers from the University of Technology Sydney (UTS) has shown for the first time that fluorescent nanoparticles placed near a mirror generate unique patterns that can be used to pinpoint their location.
The researchers attribute this effect to the light emitting nanoparticle's interference with its own mirror image. Using this method they can also detect the size of particles to a resolution of one nanometre - or around 1/80,000th of the diameter of a human hair.
This breakthrough in ultra-sensitive measuring technology, published in Nature Communications, could have many applications including tracking and analysing disease causing viruses and other pathogens.
"When we look in a mirror it doesn't change our physical shape, but that's not the case with emission patterns of nanoparticles," says leading co-author Dr Fan Wang from the UTS Institute for Biomedical Materials and Devices.
"If you put a nanoparticle in front of a mirror, it will change its image by itself, and the image shape reflects the spacing between the particle and the mirror. This is due to the phase difference between the emitter and its image," he says.
The researchers describe this encoding of position information from a particle emission's self-interference as the "SELFI effect". The resulting patterns include Gaussian, doughnut and archery target shapes.
"To the best of our knowledge, the spatial distribution of the spontaneous emission's SELFI from multiple emitters at the nanoscale has not been reported," says leading co-author Professor Dayong Jin.
"This SELFI leads to a fast, high-resolution and anti-drift sensing method to accurately resolve the position of a single nanoparticles."
The nanoparticles are doped with many rare-earth element ions to achieve the necessary luminescence to create an effective SELFI.
The authors note this new method is suitable for conventional widefield fluorescence microscopy setups without requiring system modification.
The open access article 'Axial localization and tracking of self-interference nanoparticles by lateral point spread functions' is published in Nature Communications.
[Attachments] See images for this press release:
ELSE PRESS RELEASES FROM THIS DATE:
Areas with a relatively greater amount of misogynistic tweets have higher incidences of domestic and family violence, a UNSW study has found.
The study, published in Psychological Science, not only found this connection with domestic and family violence carried over from one year to the next, but also occurred despite the 'usual suspects' of domestic violence, such as alcohol and inequality.
Examples of misogynistic tweets identified by the researchers included, "Women are all bitches," "Whore had it coming," and, "Make me a sandwich, slut."
"We found that misogynistic ...
Ever since the early humans learned to walk upright, they have suffered, as an unfortunate consequence of their erect posture, from low back pain. Modern understanding on this matter dictates that low back pain, in particular, is caused due to a postural instability resulting from poor "proprioception", which is a term for the perception of part of our body's own position in space. In fact, our trunk and lower legs are key to maintaining postural stability due to the presence of "proprioceptors"--sensory receptors responding to position and movement--in those areas.
Elderly people suffering from low back pain tend to have poorly performing proprioceptors, ...
COLUMBUS, Ohio - Researchers have found a way to use chaos to help develop digital fingerprints for electronic devices that may be unique enough to foil even the most sophisticated hackers.
Just how unique are these fingerprints? The researchers believe it would take longer than the lifetime of the universe to test for every possible combination available.
"In our system, chaos is very, very good," said Daniel Gauthier, senior author of the study and professor of physics at The Ohio State University.
The study was recently published online in the journal IEEE Access.
The researchers created a new version ...
(Boston)--Diagnosing Chronic Traumatic Encephalopathy (CTE) during life is crucial for developing therapies and for determining how common the disease is among individuals exposed to repetitive head impacts from contact sports, military service and physical violence.
While the ability to diagnose CTE prior to death has remained elusive, researchers from Boston University School of Medicine (BUSM) for the first time have shown that progressive memory loss and issues with executive function, the ability to focus, follow directions, and problem-solve, are more useful for predicting CTE pathology than mood and behavior symptoms.
CTE is a progressive brain disease. Clinically, impulsivity, explosivity, depression, memory impairment and executive dysfunction have been reported to ...
WASHINGTON, April 7, 2021 -- On the surface, Parkinson's disease -- a neurodegenerative disorder -- and melanoma -- a type of skin cancer -- do not appear to have much in common. However, for nearly 50 years, doctors have recognized that Parkinson's disease patients are more likely to develop melanoma than the general population. Now, scientists report a molecular link between the two diseases in the form of protein aggregates known as amyloids.
The researchers will present their results today at the spring meeting of the American Chemical Society (ACS). ACS Spring 2021 is being held online April 5-30. Live sessions will be hosted April ...
DALLAS, April 7, 2021 — Receiving palliative or hospice care services was found to improve quality of life for hospitalized ischemic stroke patients, however, disparities persist in which patients are prescribed or have access to these holistic comfort care options, according to new research published today in the Journal of the American Heart Association, an open access journal of the American Heart Association.
Prior to the COVID-19 pandemic, stroke ranked No. 5 among all causes of death in the U.S. Nearly 9 in 10 strokes are ischemic strokes caused by a blockage in a blood vessel that carries blood to the brain. Despite advances in acute stroke treatment and management, stroke remains a leading cause of serious long-term disability in the U.S.
Skoltech chemists have proposed a new electronegativity scale and published their findings in Nature Communications.
The concept of electronegativity introduced by Linus Pauling, a great American chemist, in the 1930s refers to the ability of an atom to attract electron density. In a chemical bond, the more electronegative atom gains extra electrons, becoming negatively charged, while the less electronegative one loses electrons and becomes positively charged. Electronegativity is a fundamental notion, essential for explaining things that range from chemical bonds' energy to the (in)stability of chemical compounds and the color and hardness of crystals.
Since then, chemists have come up with various definitions and scales of electronegativity. Yet Pauling's ...
Events such as the COVID-19 pandemic have highlighted the crucial role played by biodiversity collections in enabling rapid responses to crises and in facilitating ongoing research across numerous fields. Despite the recognized value of this infrastructure, the community nevertheless has further opportunities to maximize its value to the scientific enterprise.
Writing in BioScience, Barbara Thiers of the New York Botanical Garden and colleagues describe (https://academic.oup.com/bioscience/article-lookup/doi/10.1093/biosci/biab036) the necessary steps for the biodiversity collections community to vouchsafe its position as an important catalyst of research. The authors draw on recommendations ...
A new scientific review has found there are significant gaps in our knowledge of how mammal populations are responding to climate change, particularly in regions most sensitive to climate change. The findings are published in the British Ecological Society's Journal of Animal Ecology.
Nearly 25% of mammal species are threatened with extinction, with this risk exacerbated by climate change. But the ways climate change is impacting animals now, and projected to in the future, is known to be complex. Different environmental changes have multiple and potentially contrasting, ...
Philadelphia, April 7, 2021 - Building family child care home providers' (FCCH) self-efficacy--an individual's belief in their ability to manage their situation--for healthy eating is an important component of health promotion and can buffer the impact of stress on their diet quality, according to a new study in the Journal of Nutrition Education and Behavior, published by Elsevier.
"The FCCH provider is an important source of child care in this country. A lot of families from lower-income environments use the FCCH because of its affordability and location," said Dianne Ward, EdD, of the Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
FCCH providers can experience multiple stressors ...
LAST 30 PRESS RELEASES:
[Press-News.org] Nanoparticles reveal their location via mirror SELFI
Can a mirror turn an orange into a doughnut?