On-surface synthesis has received great attention as a method to create atomically-precise one-dimensional (1D) and two-dimensional (2D) polymers with intriguing properties. In particular, graphene nanoribbons (GNRs), a category of quasi-1D nanomaterials derived from graphene, have been widely studied due to their tunable electronic properties and potential applications in semiconductor devices, such as field-effect transistors and spintronics. A series of top-down approaches have been pursued to produce GNRs, but a lack of control over the ribbon width and edge structure has hindered their further development. In 2010, Cai et al. firstly reported the fabrication of an atomically-precise armchair GNR (AGNR) on the Au(111) surface using a bottom-up ...

The directly catalytic oxidation of alkanes has high atomic economy and application value to form corresponding chemical organic products such as alcohols, aldehydes, ketones and carboxylic acid. It is challenging to achieve efficient and selective oxidation of alkane under mild conditions due to the inert C-H bonds of alkanes. Many researchers have developed a series of supported iron based catalysts to simulate the alkane biological monooxygenase with iron center atoms. However, traditional methods, such as impregnation method, ion exchange method, etc., are ...

Air pollution from the burning of fossil fuels impacts human health but predicting pollution levels at a given time and place remains challenging, according to a team of scientists who are turning to deep learning to improve air quality estimates. Results of the team's study could be helpful for modelers examining how economic factors like industrial productivity and health factors like hospitalizations change with pollution levels. "Air quality is one of the major issues within an urban area that affects people's lives," said Manzhu Yu, assistant professor of geography at Penn State. "Yet existing observations are not adequate to provide comprehensive information that may help vulnerable populations ...

A new technique that mimics the ancient Japanese art of kirigami may offer an easier way to fabricate complex 3D nanostructures for use in electronics, manufacturing and health care. Kirigami enhances the Japanese artform of origami, which involves folding paper to create 3D structural designs, by strategically incorporating cuts to the paper prior to folding. The method enables artists to create sophisticated three-dimensional structures more easily. "We used kirigami at the nanoscale to create complex 3D nanostructures," said Daniel Lopez, Penn State ...

Scientists from Nagoya University, Yokohama City University and Chubu University have developed a system which enables the live imaging of the formation of the female gamete in plants. In flowering plants, the sperm cell and egg cell meet and fertilization takes place in the flower. While sperm cells are made in the pollen, egg cells are made in the ovule, the structure that becomes the seed. However, as the ovule is buried deep within the pistil, it has thus far been impossible to observe the formation of the egg cell in living plants. The team, led by Dr Daisuke Kurihara and Dr Tetsuya Higashiyama of Nagoya University Institute of Transformative Bio-Molecules (WPI-ITbM), Dr Daichi Susaki of Yokohama City University Kihara Institute for Biological Research ...

Washington, DC, April 1, 2021 - A study in the Journal of the American Academy of Child and Adolescent Psychiatry (JAACAP), published by Elsevier, reports that middle schoolers from a predominantly Latinx community, with elevated levels of mental health problems, showed a reduction in symptoms during the early stages of the pandemic. "While the negative impact of the COVID pandemic on mental health is widespread, our study found that COVID-19 stay-at-home measures may have offered some protective effects for youth mental health early in the pandemic," said study coordinator Francesca Penner, MA, University ...

EUGENE, Ore. -- April 2, 2021 -- Across California's Central Valley, under stress from large-scale agriculture and climate change, native bee species that are flexible in their pollination behavior when around other wild bee populations appear best suited for survival in shrinking habitats. That's the primary finding of a study published online April 1 in the journal Nature Ecology & Evolution. A research team led by University of Oregon biologist Lauren C. Ponisio identified 1,150 network interactions involving 157 wild bee species and 152 plant species at 63 sites spread across three counties. The findings emerged from observations of adult bees from 31 species whose pollination activities with at ...

FINDINGS A UCLA research team has shown that using a truncated form of the CD4 molecule as part of a gene therapy to combat HIV yielded superior and longer-lasting results in mouse models than previous similar therapies using the CD4 molecule. This new approach to CAR T gene therapy -- a type of immunotherapy that involves genetically engineering the body's own blood-forming stem cells to create HIV-fighting T cells -- has the potential to not only destroy HIV-infected cells but to create "memory cells" that could provide lifelong protection from infection with the virus that causes AIDS. BACKGROUND CAR therapies have emerged as a powerful immunotherapy for various forms of cancer and show promise ...

As an essential material for the survival and reproduction of almost all aerobic organisms, oxygen is closely related to the formation and development of complex organisms. A recent review provides a systematic overview of the latest advances in the oxygen cycle at different spatial and temporal scales and the important role that oxygen plays in shaping our current habitable Earth. Professor Jianping Huang from Lanzhou University is the corresponding author of the review entitled "The oxygen cycle and a habitable Earth", which is the cover article of the 64(4) of SCIENCE CHINA Earth Sciences in 2021. Based ...

BOSTON - In the first study to use whole genome sequencing (WGS) to discover rare genomic variants associated with Alzheimer's disease (AD), researchers have identified 13 such variants (or mutations). In another novel finding, this study establishes new genetic links between AD and the function of synapses, which are the junctions that transmit information between neurons, and neuroplasticity, or the ability of neurons to reorganize the brain's neural network. These discoveries could help guide development of new therapies for this devastating neurological condition. Researchers at Massachusetts General Hospital (MGH), the Harvard T. H. Chan School of Public Health, and Beth Israel Deaconess Medical Center report these findings in Alzheimer's & Dementia: The Journal of the Alzheimer's Association. Over ...

Bottom Line: Among patients at high risk of melanoma, those who received routine skin cancer screening and education about skin self-exams were significantly more likely to be diagnosed with thinner and earlier stage melanomas. Journal in Which the Study was Published: Cancer Epidemiology, Biomarkers & Prevention, a journal of the American Association for Cancer Research Author: Michael Sargen, MD, a dermatologist and clinical fellow in the Division of Cancer Epidemiology and Genetics at the National Cancer Institute (NCI), part of the National Institutes of Health (NIH) Background: "Whole-body screening for melanoma is currently routine for individuals at high ...

The Tibet ASγ experiment, a China-Japan joint research project on cosmic-ray observation, has discovered ultra-high-energy diffuse gamma rays from the Milky Way galaxy. The highest energy detected is estimated to be unprecedentedly high, nearly 1 Peta electronvolts (PeV, or one million billion eV). Surprisingly, these gamma rays do not point back to known high-energy gamma-ray sources, but are spread out across the Milky Way (see Fig.1). Scientists believe these gamma rays are produced by the nuclear interaction between cosmic rays escaping from the most powerful galactic sources ...

A dangerous toxin has been witnessed - for the first time - releasing into the air from pond scum, research published in the peer-reviewed journal Lake and Reservoir Management today shows. Not only is pond scum - otherwise known as algal bloom - an unsightly formation which can occur on still water across the world, it can also prove dangerous to wildlife and humans. For the first time, scientists have now detected the presence of the algal toxin anatoxin-a (ATX)which is also known as 'Very Fast Death Factor', in the air near a Massachusetts pond with large algal blooms. ATX can cause a range of symptoms at acute doses, including loss of coordination, muscular twitching and respiratory paralysis, and has been linked to the deaths of livestock, waterfowl and dogs from ...

Researchers from University of Queensland, University of Melbourne, and Universidad Finis Terrae published a new paper in the Journal of Marketing that studies consumer resistance to a nationwide plastic bag ban implemented in Chile in 2019. The study, forthcoming in the Journal of Marketing, is titled "How Do I Carry All This Now?': Understanding Consumer Resistance to Sustainability Interventions" and is authored by Claudia Gonzalez-Arcos, Alison M. Joubert, Daiane Scaraboto, and Jörgen Sandberg. As environmental crisis challenges accelerate, governments are searching for solutions to reduce the negative impacts of economic activity. One popular measure has been to ban disposable plastic ...

A palliative care doctor has suggested that studying Shakespeare's plays could help medical students connect more closely with their patients. Writing in the Journal of the Royal Society of Medicine Dr David Jeffrey, of the Department of Palliative Medicine at the University of Edinburgh, investigates how the playwright's empathic approach - the ability to understand and share the feelings of another - can enhance the patient-doctor relationship. Dr Jeffrey writes that the idea that emotions are disruptive and need to be controlled is deeply ingrained in medical education and practice, contributing to doctors distancing from patients. The coronavirus pandemic, with ...

Fewer than half of inmates in jails and prisons surveyed in a study by the CDC and University of Washington said they would accept a COVID-19 vaccine, while the majority either said they wanted to wait before getting the vaccine or would refuse one. "This is a population already at risk for COVID-19, and outbreaks among incarcerated people can worsen inequities in COVID-19 outcomes as well as contribute to spread in the surrounding community," said lead author Dr. Marc Stern, affiliate assistant professor of health services in the UW School of Public Health. "So culturally and health-literacy informed interventions are needed to help them feel more confident about getting vaccinated." The study conducted by CDC researchers ...

As the COVID-19 pandemic lingers, researchers have found associations between certain lifestyle factors and a person's risk of getting infected. While it has already been established that those with Type II diabetes and a high body mass index (BMI) are at greater risk of experiencing hospitalizations and other severe complications related to COVID-19, they are also at greater risk of getting symptomatic infection in the first place. That is the finding of a recent study conducted by researchers at the University of Maryland School of Medicine that was published today in the journal PLoS ONE. Using data from the UK Biobank of 500,000 British volunteers over age 40, the researchers examined ...

ROCHESTER, Minn. -- All too often, patients with high levels of antibodies face major challenges getting a transplant. These highly sensitized patients have a much higher risk of death while waiting for suitable organs they are less likely to reject. But there is new hope for highly sensitized patients in need of a combined heart and liver transplant, thanks to an innovative surgical approach at Mayo Clinic. Traditionally, surgeons transplant the heart first, followed by the liver. But Mayo Clinic heart transplant team decided to reverse the order for highly sensitized patients in the hopes that the liver would absorb some of the patient's antibodies, removing them from circulation and lowering ...

Researchers have confirmed for the first time that Pine Island Glacier in West Antarctica could cross tipping points, leading to a rapid and irreversible retreat which would have significant consequences for global sea level. Pine Island Glacier is a region of fast-flowing ice draining an area of West Antarctica approximately two thirds the size of the UK. The glacier is a particular cause for concern as it is losing more ice than any other glacier in Antarctica. Currently, Pine Island Glacier together with its neighbouring Thwaites glacier are responsible for about 10% of the ongoing increase in global sea level. Scientists have argued for some time that this region of Antarctica could reach a tipping point and undergo an irreversible ...

Kidney development is a balancing act between the self-renewal of stem and progenitor cells to maintain and expand their numbers, and the differentiation of these cells into more specialized cell types. In a new study in the journal eLife from Andy McMahon's laboratory in the Department of Stem Cell Biology and Regenerative Medicine at the Keck School of Medicine of USC, former graduate student Alex Quiyu Guo and a team of scientists demonstrate the importance of a molecule called β-catenin in striking this balance. β-catenin is a key driver at the end of a complex signaling cascade known as the Wnt pathway. Wnt signaling plays critical roles in the embryonic development of multiple organs including the kidneys. By partnering with ...

Key Takeaways: Discounting or couponing is not the most effective way to tap the power of retargeting in online marketing. Customized seller recommendations may be more powerful than discounting. Seller auctions that allow marketers to self-select in the retargeting process improve cost efficiency. CATONSVILLE, MD, April 1, 2021 - Online marketers have seen the pattern: 95%-98% of online visitors search for something, but the search never converts into a purchase and they leave the site without buying. For marketers, this results in speculation and assumptions that can lead to wasted time and investments in ineffective marketing programs. One of the more common ways online marketers attempt to solve this problem is to "retarget," which tracks those consumers and reconnects ...

Boulder, Colo., USA: GSA's dynamic online journal, Geosphere, posts articles online regularly. Locations studied this month include the western Himalaya, the boundary between the southern Coast Ranges and western Transverse Ranges in California, the northern Sierra Nevada, and northwest Nepal. Marine sedimentary records of chemical weathering evolution in the western Himalaya since 17 Ma Peng Zhou; Thomas Ireland; Richard W. Murray; Peter D. Clift Abstract: The Indus Fan derives sediment from the western Himalaya and Karakoram. Sediment from International Ocean Discovery Program drill sites in the eastern part of the fan coupled with data from an industrial ...

Below please find a summary of a new article that is published in Annals of Internal Medicine today. The summary is not intended to substitute for the full article as a source of information. Physicians must advocate for common sense gun laws for good of public health #thisisourlane FREE content: https://www.acpjournals.org/doi/10.7326/M21-1505 A pointed editorial by Douglas DeLong, MD, Chief of the Division of General Internal Medicine at Bassett Healthcare in Cooperstown, NY, suggests that it's time for physicians to move past talking and start taking ...

The recent power outages in Texas brought attention to its power grid being separated from the rest of the country. While it is not immediately clear whether integration with other parts of the national grid would have completely eliminated the need for rolling outages, the state's inability to import significant amounts of electricity was decisive in the blackout. A larger power grid has perks, but also has perils that researchers at Northwestern University are hoping to address to expedite integration and improvements to the system. An obvious challenge in larger grids is that failures can propagate further -- in the case of Texas, across state lines. Another is that all power generators ...

Telehealth has become a critical way for doctors to still provide health care while minimizing in-person contact during COVID-19. But with phone or Zoom appointments, it's harder for doctors to get important vital signs from a patient, such as their pulse or respiration rate, in real time. A University of Washington-led team has developed a method that uses the camera on a person's smartphone or computer to take their pulse and respiration signal from a real-time video of their face. The researchers presented this state-of-the-art system in December at the Neural Information Processing Systems conference. Now the team is proposing a better system to measure these physiological signals. This system is less likely to be tripped up by different ...