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Internet and phone connections are essential for effective communicators and for success in business. New results from the Smithsonian Tropical Research Institute in Panama show […]

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Coral reefs are home to some of the most colorful, diverse life on the planet. And yet, for all their fame as biodiversity hotspots, it’s […]

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To catch lizards on the offshore islands close to St. Croix in the Caribbean, Smithsonian herpetologist Nicole Angeli uses a lasso of thread looped at […]

The post Mongooses wiped them out. Now Nicole Angeli wants the St. Croix ground lizard home again appeared first on Smithsonian Insider.

White-tailed deer don’t like to eat the invasive plants Japanese stilt grass, garlic mustard or barberry. Native oak seedlings and tulip poplar, on the other […]

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A new paper published in Behavioral Ecology finds that some ant colonies defend more gallantly than others, revealing that colonies themselves may have personalities. Trees that have […]

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“One cannot think well, love well, sleep well if one has not dined well,” Virginia Woolf once said. Woolf’s sentiment is one that the staff […]

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The crystal structure of vanthoffite, Na6Mg(SO4)4, was redetermined and refined with anisotropic displacement parameters for all atoms. Here, for the first time, we give its detailed description.

The cationic cyclo­metallated iridium(III) complex [Ir(C9H7N2)2(C12H8N2)](PF6) has been synthesized and crystallized by the inter-diffusion method. It contains an unknown number of solvent mol­ecules and has a different space-group symmetry (C2/c) structure than its solvatomorph (P21/c).

The title compound exhibits exceptionally weak inter­molecular C—H⋯π hydrogen bonding of the ethynyl groups, with the corresponding H⋯π separations [2.91 (2) and 3.12 (2) Å] exceeding normal vdW distances. This bonding compliments distal contacts of the CH (aliphatic)⋯π type [H⋯π = 3.12 (2)–3.14 (2) Å] to sustain supra­molecular layers.

This work considers the scaling properties characterizing the hyperuniformity (or anti-hyperuniformity) of long-wavelength fluctuations in a broad class of one-dimensional substitution tilings. A simple argument is presented which predicts the exponent α governing the scaling of Fourier intensities at small wavenumbers, tilings with α > 0 being hyperuniform, and numerical computations confirm that the predictions are accurate for quasiperiodic tilings, tilings with singular continuous spectra and limit-periodic tilings. Quasiperiodic or singular continuous cases can be constructed with α arbitrarily close to any given value between −1 and 3. Limit-periodic tilings can be constructed with α between −1 and 1 or with Fourier intensities that approach zero faster than any power law.

The title compound, C14H16, exhibits exceptionally weak intermolecular C—H...π hydrogen bonding of the ethynyl groups, with the corresponding H...π separations [2.91 (2) and 3.12 (2) Å] exceeding normal vdW distances. This bonding complements distal contacts of the CH (aliphatic)...π type [H...π = 3.12 (2)–3.14 (2) Å] to sustain supramolecular layers. Hirshfeld surface analysis of the title compound suggests a relatively limited significance of the C...H/H...C contacts to the crystal packing (24.6%) and a major contribution from H...H contacts accounting 74.9% to the entire surface.

The cationic complex in the title compound, [Ir(C9H7N2)2(C12H8N2)]PF6, comprises two phenylpyrazole (ppz) cyclometallating ligands and one 1,10-phenanthroline (phen) ancillary ligand. The asymmetric unit consists of one [Ir(ppz)2(phen)]+ cation and one [PF6]− counter-ion. The central IrIII ion is six-coordinated by two N atoms and two C atoms from the two ppz ligands as well as by two N atoms from the phen ligand within a distorted octahedral C2N4 coordination set. In the crystal structure, the [Ir(ppz)2(phen)]+ cations and PF6− counter-ions are connected with each other through weak intermolecular C—H...F hydrogen bonds. Additional C—H...π interactions between the rings of neighbouring cations consolidate the three-dimensional network. Electron density associated with additional disordered solvent molecules inside cavities of the structure was removed with the SQUEEZE procedure in PLATON [Spek (2015). Acta Cryst. C71, 9–18]. The given chemical formula and other crystal data do not take into account the unknown solvent molecule(s). The title compound has a different space-group symmetry (C2/c) from its solvatomorph (P21/c) comprising 1.5CH2Cl2 solvent molecules per ion pair.

The crystal structure of vanthoffite {hexasodium magnesium tetrakis[sulfate(VI)]}, Na6Mg(SO4)4, was solved in the year 1964 on a synthetic sample [Fischer & Hellner (1964). Acta Cryst. 17, 1613]. Here we report a redetermination of its crystal structure on a mineral sample with improved precision. It was refined in the space group P21/c from a crystal originating from Surtsey, Iceland. The unique Mg (site symmetry overline{1}) and the two S atoms are in usual, only slightly distorted octahedral and tetrahedral coordinations, respectively. The three independent Na atoms are in a distorted octahedral coordination (1×) and distorted 7-coordinations intermediate between a `split octahedron' and a pentagonal bipyramid (2×). [MgO6] coordination polyhedra interchange with one half of the sulfate tetrahedra in <011> chains forming a (100) meshed layer, with dimers formed by edge-sharing [NaO7] polyhedra filling the interchain spaces. The other [NaO7] polyhedra are organized in a parallel layer formed by [010] and [001] chains united through edge sharing and bonds to the remaining half of sulfate groups and to [NaO6] octahedra. The two types of layers interconnect through tight bonding, which explains the lack of morphological characteristics typical of layered structures.

The enanti­opure monopyrrolidine derivative (2S)-methyl (Z)-5-(2-tert-but­oxy-1-cyano-2-oxo­ethyl­idene)pyrrolidine-2-carboxyl­ate, C13H18N2O4, (1), represents a potential ligand and an attractive inter­mediate for the synthesis of chiral metal com­plexes. At the mol­ecular level, the com­pound features an intra­molecular N—H⋯O hydrogen bond; neighbouring mol­ecules inter­act via N—H⋯N contacts to form chains along [100]. Due to its elemental com­position, resonant scattering of the target com­pound is entirely insignificant for diffraction experiments with Mo Kα and small even for Cu Kα radiation. A preliminary study with the harder radiation type confirmed the chiral space group and the suitability of the single crystal chosen; as expected, the results concerning the absolute structure remained com­pletely inconclusive. A second data collection with the longer wavelength gave satisfactory quality indicators for the correct handedness of the mol­ecule, albeit with high standard uncertainties. The absolute configuration has been assessed independently: CD spectra for both enanti­omers of the target mol­ecule were calculated and the spectrum for the S-configured stereoisomer was in agreement with the experiment. The Cotton effect of (1) may be ascribed to π–π* transitions from HOMO to LUMO and from HOMO to LUMO+1. As both independent techniques agree with respect to the handedness of the target mol­ecule, the absolute structure may be assigned with a high degree of confidence.

Physical quantities in arbitrary dimensional space can be classified into 41 types using three antisymmetries within the framework of Clifford algebra.

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A new study shows that the West Antarctic Peninsula is experiencing some of the most rapid climate change on Earth, featuring dramatic increases in temperatures, retreats in glaciers and declines in sea ice. The Southern Ocean absorbs nearly half of the carbon dioxide -- the key greenhouse gas linked to climate change -- that is absorbed by all the world's oceans. The study tapped an unprecedented 25 years of oceanographic measurements in the Southern Ocean and highlights the need for more monitoring in the region. The research revealed that carbon dioxide absorption by surface waters off the West Antarctic Peninsula is linked to the stability of the upper ocean, along with the amount and type of algae present. A stable upper ocean provides algae with ideal growing conditions. During photosynthesis, algae remove carbon dioxide from the surface ocean, which in turn draws carbon dioxide out of the atmosphere. From 1993 to 2017, changes in sea ice dynamics off the West Antarctic Peninsula stabilized the upper ocean, resulting in greater algal concentrations and a shift in the mix of algal species. That's led to a nearly five-fold increase in carbon dioxide absorption during the summertime. The research also found a strong north-south difference in the trend of carbon dioxide absorption. The southern portion of the peninsula, which to date has been less impacted by climate change, experienced the most dramatic increase in carbon dioxide absorption, demonstrating the poleward progression of climate change in the region.

Image credit: Drew Spacht/The Ohio State University

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On August 17, 2017, scientists made history with the first direct observation of a merger between two neutron stars. It was the first cosmic event detected in both gravitational waves and the entire spectrum of light, from gamma rays to radio emissions. The impact also created a kilonova -- a turbocharged explosion that instantly forged several hundred planets’ worth of gold and platinum. The observations provided the first compelling evidence that kilonovae produce large quantities of heavy metals, a finding long predicted by theory. Astronomers suspect that all of the gold and platinum on Earth formed as a result of ancient kilonovae created during neutron star collisions. Based on data from the 2017 event, first spotted by the Laser Interferometer Gravitational-wave Observatory (LIGO), astronomers began to adjust their assumptions of how a kilonova should appear to Earth-bound observers. A team of scientists reexamined data from a gamma-ray burst spotted in August 2016 and found new evidence for a kilonova that went unnoticed during the initial observations.

Image credit: NASA/ESA/E. Troja

Source: Streetwise Reports   05/06/2020

Testing has been an Achilles heel of the coronavirus pandemic, but ProMIS Neurosciences Inc. (PMN:TSX; ARFXF:OTCQB) has partnered with Dr. Hans Frykman and the BC Neuroimmunology Lab to use its unique technology to create a more accurate antibody test for SARS-CoV-2, the virus that causes Covid-19.

Two main types of tests exist for Covid-19: one that detects the presence of the virus that causes Covid-19, which indicates a person has an active infection, and another that detects antibodies, showing that a person has been exposed to the virus.

The first test that was developed, a test for the presence of the virus, is used mainly to confirm diagnosis of Covid-19 in people who are showing symptoms such as a fever, a dry, persistent cough, difficulty breathing, a sense of restriction in the chest. "They are typical signs of Covid-19, but we would want to know if these are signs of the common flu or a bad cold or Covid-19. We know that Covid can progress really significantly very quickly, especially in individuals with underlying conditions," ProMIS CEO Dr. Elliot Goldstein told Streetwise Reports. "The number of tests is limited, but it's not actually the tests themselves but the reagents and systems you need to run the test that are in short supply."

"Anytime you conduct a test for the virus and get a negative response, the test indicates only that on that day at that time, the person does not have the virus. The person could have had Covid and recovered, or might have had an asymptomatic or very mild case. Or that person could get the virus tomorrow or in three days," Dr. Goldstein explained. "At any point in time the virus test helps indicate the prevalence of the virus—how many people are actually infected—if you test broadly, and at the time you do it, you can determine whether an individual is currently infected or not."

The second type of test, called serological tests or assays, is also known as an antibody test. "When a person is recovering from a viral infection, the immune system makes antibodies—also called immunoglobulins—that are specific to the virus. They neutralize the virus and help clear it out; that's part of the mechanism of why you get better," Dr. Goldstein explained.

One way to see if a person has had Covid is to test for antibodies. "A positive test means you've been exposed to the virus because, in the absence of a vaccine, that's the only way you would have the antibodies. While it's not 100% certain that antibodies neutralize the virus, based on experience with other coronaviruses, it is likely," Dr. Goldstein said. Having the virus neutralized should offer at least some protection against future re-infections.

People who have had positive virus tests know that they have Covid or had Covid and recovered, but many people are asymptomatic or may have had what felt like a light cold, and they want to know if they are at risk, or if they have some protection against the disease. "This is really important for frontline healthcare workers, people working 8-10 hours a day in intensive care or the emergency room with patients known to be very sick with Covid-19; even with protective equipment, they have significant exposure to the virus," Dr. Goldstein explained. "If someone has been through the disease and has natural antibodies, they can't infect someone else. What you want to know on an individual level is am I safe from infection and am I safe for other people."

Generally, antibody testing is a fairly common procedure, Dr. Goldstein explained. When you spin blood in a centrifuge, it separates into three parts: red blood cells, plasma and serum. Serum is where you find antibodies. "ELISA (enzyme-linked immunosorbent assay) is a standard test that looks for antibodies, but it is not specific enough for the Covid-19 virus."

The challenge is there are multiple coronaviruses. "Four different coronaviruses are responsible for the common cold, and then there are others like SARS and MERS. They all have the same sort of halo or corona of protein around the outside of it," Dr. Goldstein said. "They look like the old naval mines used in war. The whole family of coronaviruses look like that. The amino acid sequences of different coronaviruses are not identical but very similar; they share a lot of common structures. There are only really small differences and you can't really pick them up using the usual physical methods."

Studies have shown that up to 90% of individuals in Western countries have been exposed to one or more of the common cold coronaviruses and have antibodies against them. "They look very similar to the coronavirus causing Covid-19. So in Covid-19 antibody tests, the most important thing is it has to be highly specific for the Covid-19 antibodies and doesn't test positive when it identifies a common cold antibody. That is a false positive," said Dr. Goldstein. "It's actually much safer not to have a test that has a lot of false positives because you could base a behavioral decision on faulty information."

Dr. Goldstein cited an example. "If you are testing 1,000 people and there is a 90% prevalence for the cold virus, that means around 900 people have antibodies to the common cold. If the prevalence of the Covid-19 virus is 2%, roughly 20 of the 1,000 would have antibodies to the Covid-19 virus. Let's say the serology test has 95% specificity. That means five times out of 100, it will give a false positive, indicating the presence of Covid-19 antibodies when it is really picking up antibodies against the cold virus. What this means is 5% of 900, or 45 people, will test positive for Covid when they have not had it, and are making decisions based on incorrect information. The consequences of being wrong are dramatic and highlight the need for a very good, high-quality serological test."

How does this relate to Alzheimer's and other neurological diseases that are ProMIS' core competency? "In Alzheimer's, ALS, frontotemporal dementia, Parkinson's disease and other neurological disease, we've been able to use our proprietary, unique technology to identify sites on misfolded proteins that are driving these diseases. Our core technology is the capability to understand what's special about the bad proteins that are causing these diseases and then we can make antibodies highly selective against them. Our technology allows us to identify a region, an epitopes target, which is a series of four to six amino acids where the protein has misfolded. Not only do we know where this target site is located, importantly we also determine the shape (conformation) of this site. Proteins like amyloid and alpha synuclein and TDP 43 misfold and when these proteins misfold they become toxic, they kill neurons, resulting in disease," Dr. Goldstein explained.

ProMIS has transferred that thinking to the virus causing Covid-19. "The corona is composed of the spiky protein. Remember, we want to be able to distinguish between the coronavirus causing the common cold and the coronavirus causing Covid-19," Dr. Goldstein said. "If we can distinguish between the two, we can have an antibody test that's specific for Covid-19. We are looking at a region of the virus called the receptor binding domain, the RBD, that is part of the spike protein and how it attaches to cells. We have a core competency that allows us to identify sites, and not just the location of the sites, but the shape of the sites on complex protein molecules. That allows us then to use that knowledge to create either antibodies or to create serum tests, or even quite frankly, we can use those targets to create vaccines."

Using ProMIS' proprietary technology, the company has been able to "identify a site that we believe is only present on the Covid-19 virus and not on other coronaviruses. We are now initiating the synthesis of several different forms of that site; it's a small area," Dr. Goldstein stated. "That would then transfer to Dr. Hans Frykman's lab at University of British Columbia, a world-class serology lab. Then we will see if the targets we've identified are specific and selective antibodies against Covid-19."

When you test the serum of an individual, if they've been exposed to the virus and have the antibodies, "those antibodies should bind selectively and specifically to the target. So if the antibodies from the patient's serum are binding to the target site, we know it's a Covid-19 virus because that site is only visible in that shape on the Covid-19 virus and not the others. For the validation of our test, only in patients known to have had Covid-19 should we see binding of antibodies against Covid-19 to our target. The second validation is based on testing in serum from subjects known to have never been exposed to Covid-19 virus—such subjects have antibodies only from cold or other coronaviruses, and therefore the antibody test should be negative; there should be no binding. So we should only see binding in serum from a patient known to have recovered from COVID-19, and we should not see binding in serum from an individual known not to have been exposed to COVID-19," Dr. Goldstein explained.

"Our technology basically allows us to zero in with sniper-like precision on the structure of a protein and understand it, not only the structure overall but the shape of the regions on that protein and then that allows us to identify what is specific to that protein, in this case the spiky protein on the virus causing COVID-19," said Dr. Goldstein.

ProMIS expects to have initial results in June.

Disclosure:
1) Patrice Fusillo compiled this article for Streetwise Reports LLC and provides services to Streetwise Reports as an employee. She or members of her household own securities of the following companies mentioned in the article: None. She or members of her household are paid by the following companies mentioned in this article: None.
2) The following companies mentioned in this article are billboard sponsors of Streetwise Reports: ProMIS Neurosciences. Click here for important disclosures about sponsor fees.
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( Companies Mentioned: PMN:TSX; ARFXF:OTCQB, )

Cancer-causing chemicals that occur naturally in foods are far more numerous in the human diet than synthetic carcinogens, yet both types are consumed at levels so low that they currently appear to pose little threat to human health, a committee of the National Research Council said in a report released today.

Bacteria that resist antibiotics can be passed from food animals to humans, but not enough is known to determine the public health risks posed by such transmission, says a new report by a committee of the National Research Council.

Insufficient evidence exists to support claims that taking megadoses of dietary antioxidants, such as selenium and vitamins C and E, or carotenoids, including beta-carotene, can prevent chronic diseases, says the latest report on Dietary Reference Intakes (DRIs) from the Institute of Medicine of the National Academies.

While every mode of transportation in the U.S. will be affected as the climate changes, potentially the greatest impact on transportation systems will be flooding of roads, railways, transit systems, and airport runways in coastal areas because of rising sea levels and surges brought on by more intense storms, says a new report from the National Research Council.

Good morning. I am Dr. Alice Gast and I am here today with Dr. David Relman as the chair and vice chair of the Committee on the Review of the Scientific Approaches Used During the FBI’s Investigation of the 2001 Bacillus anthracis Mailings.

A National Research Council committee asked to examine the scientific approaches used and conclusions reached by the Federal Bureau of Investigation during its investigation of the 2001 Bacillus anthracis mailings has determined that it is not possible to reach a definitive conclusion about the origins of the anthrax in letters mailed to New York City and Washington, D.C., based solely on the available scientific evidence.

On average, Americans die sooner and experience higher rates of disease and injury than people in other high-income countries, says a new report from the National Research Council and Institute of Medicine.

Given the minimal impact of long prison sentences on crime prevention and the negative social consequences and burdensome financial costs of U.S. incarceration rates, which have more than quadrupled in the last four decades, the nation should revise current criminal justice policies to significantly reduce imprisonment rates, says a new report from the National Research Council.

A new report from the National Research Council has upheld the listing of styrene as “reasonably anticipated to be a human carcinogen” in the National Toxicology Program’s 12th Report on Carcinogens (RoC).

As immigrants and their descendants become integrated into U.S. society, many aspects of their lives improve, including measurable outcomes such as educational attainment, occupational distribution, income, and language ability, but their well-being declines in the areas of health, crime, and family patterns, says a new report from the National Academies of Sciences, Engineering, and Medicine.

Veterans who participated in a series of tests during the 1960s known as Project SHAD (Shipboard Hazard and Defense) show no significant increase in adverse health outcomes, specific causes of death, or death rates compared with a similar group of veterans who were not involved in the tests, says a new report from a committee of the National Academies of Sciences, Engineering, and Medicine.