A peek inside the gates at the Goodman Games late summer 2017. Held in the heart of Anacostia’s historic Barry Farm, the Goodman League hosts […]
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“Our guide celebrates the beauty of some of the most attractive inhabitants of Panama’s undersea realm and provides an indispensable, easy-to-use tool for their identification,” say the Littlers.
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Katie Cramer is a MarineGEO Post-Doctoral Fellow and travels to Smithsonian Tropical Research Institute in Panama throughout the year to conduct research. Her recent paper […]
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A global analysis raises the minimum estimated number of tropical tree species to at least 40,000–53,000 worldwide in a paper appearing in Proceedings of the […]
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Rattlesnake, zebra and peacock plants have a new wild relative, discovered by Rodolfo Flores, Panamanian botanist and intern at the Smithsonian Tropical Research Institute (STRI). […]
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The Smithsonian Tropical Research Institute (STRI) celebrated with Panama the completion of the Panama Canal expansion project on June 26, 2016. The $5.6 billion engineering […]
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Strategically placed honeybee hives can deter African elephants from raiding crops, but the hives must be actively managed by beekeepers to work, according to a […]
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What might lure someone away from the sunny beaches and lush forests of Brazil to the concrete jungle of Washington, D.C.? For wood anatomist Marcelo […]
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(A male golden-collared manakin cleans up his display area.) Few of us would find a marriage proposal made amidst dirty dishes and messy clutter particularly […]
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In the structure of the title salt, second-order Jahn–Teller distortion of the coordination octahedra around V ions is reflected by coexistence of short V—O bonds and trans-positioned long V—F bonds, with four equatorial V—F distances being intermediate in magnitude. Hydrogen bonding of the anions is restricted to F-atom acceptors only, with particularly strong N–H⋯F interactions [N⋯F = 2.5072 (15) Å] established by axial and cis-positioned equatorial F atoms.
The asymmetric unit of the title compound contains two independent molecules, consisting of perimidine and phenol units, which are linked through an N—H⋯O hydrogen bond. Intramolecular O—H⋯N hydrogen bonds are observed in both independent molecules.
The title compound, 1-(2,5-dimethoxyphenyl)-2,2,6,6-tetramethylpiperidine, was synthesized as a side-product during the synthesis of the intermediate, methyl 3,6-dimethoxy-2-(2-methoxy-2-oxoethyl)benzoate, necessary for the total synthesis of the isocoumarin 5,8-dimethoxy-3-methyl-1H-isochromen-1-one.
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.
The dihedral angle between the two aromatic rings of the title compound is 64.12 (14)°. The crystal structure is stabilized by a short Cl⋯H contact, C—Cl⋯π and van der Waals interactions.
The title complex, Cu(L)2 or [Cu(C15HF10O2)2], comprising one copper ion and two fully fluorinated ligands (L−), was crystallized with 3,4-ethylenedioxythiophene (EDOT, C6H6O2S) as a guest molecule to give in a dichloromethane solution a unique co-crystal, Cu(L)2·3C6H6O2S.
The structural and nonlinear optical properties of a new anilinium hybrid crystal of chemical formula (C6H7NCl+·NO3−)3 have been investigated. The crystal structure was determined from single-crystal X-ray diffraction measurements performed at a temperature of 100 K which show that the compound crystallizes in a noncentrosymmetric space group (Pna21). The structural analysis was coupled with Hirshfeld surface analysis to evaluate the contribution of the different intermolecular interactions to the formation of supramolecular assemblies in the solid state that exhibit nonlinear optical features. This analysis reveals that the studied compound is characterized by a three-dimensional network of hydrogen bonds and the main contributions are provided by the O...H, C...H, H...H and Cl...H interactions, which alone represent ∼85% of the total contributions to the Hirshfeld surfaces. It is noteworthy that the halogen...H contributions are quite comparable with those of the H...H contacts. The nonlinear optical properties were investigated by nonlinear diffuse femtosecond-pulse reflectometry and the obtained results were compared with those of the reference material LiNbO3. The hybrid crystals exhibit notable second (SHG) and third (THG) harmonic generation which confirms its polarity is generated by the different intermolecular interactions. These measurements also highlight that the THG signal of the new anilinium compound normalized to its SHG counterpart is more pronounced than for LiNbO3.
In the title compound, C16H14Cl2FN3, the dihedral angle between the two aromatic rings is 64.12 (14)°. The crystal structure is stabilized by a short Cl...H contact, C—Cl...π and van der Waals interactions. The Hirshfeld surface analysis and two-dimensional fingerprint plots show that H...H (33.3%), Cl...H/H...Cl (22.9%) and C...H/H...C (15.5%) interactions are the most important contributors towards the crystal packing.
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 asymmetric unit of the title compound, C17H14N2O, contains two independent molecules each consisting of perimidine and phenol units. The tricyclic perimidine units contain naphthalene ring systems and non-planar C4N2 rings adopting envelope conformations with the C atoms of the NCN groups hinged by 44.11 (7) and 48.50 (6)° with respect to the best planes of the other five atoms. Intramolecular O—H...N hydrogen bonds may help to consolidate the molecular conformations. The two independent molecules are linked through an N—H...O hydrogen bond. The Hirshfeld surface analysis of the crystal structure indicates that the most important contributions for the crystal packing are from H...H (52.9%) and H...C/C...H (39.5%) interactions. Hydrogen bonding and van der Waals interactions are the dominant interactions in the crystal packing. Density functional theory (DFT) optimized structures at the B3LYP/ 6–311 G(d,p) level are compared with the experimentally determined molecular structure in the solid state. The HOMO–LUMO behaviour was elucidated to determine the energy gap.
In the title compound, C17H27NO2, the piperidine ring has a chair conformation and is positioned normal to the benzene ring. In the crystal, molecules are linked by C—H...O hydrogen bonds, forming chains propagating along the c-axis direction.
In the structure of the title salt, (C7H12N6)[VOF5], second-order Jahn–Teller distortion of the coordination octahedra around V ions is reflected by coexistence of short V—O bonds [1.5767 (12) Å] and trans-positioned long V—F bonds [2.0981 (9) Å], with four equatorial V—F distances being intermediate in magnitude [1.7977 (9)–1.8913 (9) Å]. Hydrogen bonding of the anions is restricted to F-atom acceptors only, with particularly strong N–H...F interactions [N...F = 2.5072 (15) Å] established by axial and cis-positioned equatorial F atoms. Hirshfeld surface analysis indicates that the most important interactions are overwhelmingly H...F/F...H, accounting for 74.4 and 36.8% of the contacts for the individual anions and cations, respectively. Weak CH...F and CH...N bonds are essential for generation of three-dimensional structure.
A cosplay gathering in the Anaheim Convention Center's Grand Plaza during WonderCon Anaheim 2014.; Credit: Kevin Green/SDCC
Mike RoeFor all the sad comic book and pop culture fans who weren't able to get tickets to San Diego Comic-Con, we've got good news for you: They run another convention, and it's closer to Los Angeles. Their little brother WonderCon Anaheim has been growing, with some comparing it to the Comic-Con of old — before it got way too crowded. It's this Friday through Sunday, April 3-5. They're starting to have big stars and lots of great panels, so if you want to get your geek heart sated, here are some of the events you won't want to miss.
The most highly anticipated event at this weekend's convention, Warner Brothers is putting on a special presentation with footage from these two upcoming action films. They haven't announced which stars will be on hand, but these panels often surprise with star power, so you may get a visit from stars like "San Andreas's" Dwayne "The Rock" Johnson or "Mad Max: Fury Road's" Tom Hardy or Charlize Theron. At the Comic-Con panel last year for the "Mad Max" flick, the director talked in detail about the film, so you'll probably at least get his take on the franchise and its resurrection.
While Marvel has been dominant on the big screen, DC has put out a diverse slate of TV shows, with "The Flash" being the biggest hit among them. It's among those getting a spotlight at WonderCon, with creators and stars dishing on the programs that have captured the imaginations of TV fans and comic fans alike. All three shows are also getting special video presentations, likely showing clips of what you can expect the rest of this season. And in case you didn't already know, "iZombie" comes from "Veronica Mars" creator Rob Thomas, so come find out about his latest project.
It's become a tradition at both WonderCon and San Diego Comic-Con for DC Comics to debut their latest animated movie, and the new one is based on the critically acclaimed "Court of Owls" storyline by writer Scott Snyder. (Be sure to check out our previous interviews with Snyder — he's even an NPR fan.) The original story is based on how Batman thinks he knows everything there is to know about Gotham City and faces the discovery that there are deep secrets about the city that he had no idea about, and the film also emphasizes him fighting his son Damian.
Batman: The Brave and the Bold: Drives Us Bats
People go to comic conventions to geek out, and what's geekier than a good old-fashioned singalong? In addition to one for geek god Joss Whedon's much loved Web series "Dr. Horrible's Sing-Along Blog," they're also doing one for the musical episode of animated series "Batman: The Brave and the Bold" — which, just like "Dr. Horrible," features singing by the one and only Neil Patrick Harris. In the Batman cartoon, he plays the Music Meister, a Batman villain who makes both heroes and villains sing, as he drops some tunes of his own.
There's a reunion of stars from the first two of the classic Christopher Reeve Superman movies, including Lois Lane herself, Margot Kidder. You can also see the actors who played characters like Jimmy Olsen, several of the villains and more, as well as two of the producers. Find out what you don't know about the movie that broke ground when it came to depicting flight on-screen and, like the ads promised, made you believe a man could fly.
Two panels will give you a peek into the world of the writers who write some of the hottest shows on TV: "TV Guide Magazine's Fan Favorites Showrunners" and "Inside The Writers' Room: Earth's Mightiest Writers Re-Assemble Redux." The first of those includes legendary TV showrunners like Dan Harmon of "Community" and the minds behind shows including "Orphan Black," "The Goldbergs" and more. Meanwhile, at the writers room panel, you'll get writers who've worked on shows like "Lost," "Firefly," "Heroes," "The Big Bang Theory," "Agent Carter" and more.
This includes a lot of different panels, but it's a sign of the way fandom is shifting — it's a lifestyle that's far more diverse than it used to be, with a lot more gender parity. This track includes panels on topics like body confidence in cosplay, fashion, fitness, race and more. See what sparks your interest and might invite you into having an identity as a fan being a bigger part of your life while not letting anyone make you feel excluded.
There's so much more, like Will Forte doing a panel promoting his new show "The Last Man On Earth," the annual cosplay masquerade and so much more. Tickets are sold out for Saturday, but at press time, tickets were still available for both Friday and Sunday at WonderCon.
This content is from Southern California Public Radio. View the original story at SCPR.org.
A Landau theory for the wurtzite-based heterovalent ternary semiconductor ZnSnN2 is developed and a first-order reconstructive phase transition is proposed as the cause of observed crystal structure disorder. The model infers that the phase transition is paraelectric to antiferroelectric.
The analytical solution of the problem of X-ray spherical-wave Laue diffraction in a single crystal with a linear change of thickness on the exit surface is derived. General equations are applied to a specific case of plane-wave Laue diffraction in a thick crystal under the conditions of the Borrmann effect.
Using mineralogical data, it is demonstrated that chemical simplicity measured as an amount of Shannon information per atom on average corresponds to higher symmetry measured as an order of the point group of a mineral, which provides a modern formulation of the Fedorov–Groth law.
(The Paypers) Fenergo, a provider of digital Client Lifecycle Management (CLM) software solutions for...
(The Paypers) A new survey suggests the majority of Canadians remain worried about the security of their personal information online.
Symend, a Canada-based digital engagement platform, has raised USD 52 million to identify customers...
As society changes, it places new demands on its surroundings. New research has found that some EU countries are better able to manage the undesirable expansion of cities, the concept known as ‘urban sprawl’, because they have a flexible spatial planning policy that can easily adapt to changes. Urban sprawl is a term used to describe the expansion of residential suburbs around city centres, driven by peoples’ desire to live in larger houses and the ease of transport made possible by cars.
Marijuanas active components are potentially effective in treating pain, nausea, the anorexia of AIDS wasting, and other symptoms, and should be tested rigorously in clinical trials.
Good morning and welcome. There has been unprecedented interest in recent years about whether marijuana or its constituent compounds should be used as medicine. Since 1996, voters in seven states have approved the medical use of marijuana.
Many U.S. farmers who grow genetically engineered (GE) crops are realizing substantial economic and environmental benefits -- such as lower production costs, fewer pest problems, reduced use of pesticides, and better yields -- compared with conventional crops, says a new report from the National Research Council.
Every year, approximately 100 million* adult Americans experience chronic pain, a condition that costs the nation between $560 billion and $635 billion annually, says a new report from the Institute of Medicine.
The analysis used by federal agencies to set standards for fuel economy and greenhouse gas emissions for new U.S. light-duty vehicles -- passenger cars and light trucks -- from 2017 to 2025 was thorough and of high caliber overall, says a new report from the National Research Council.
The best indicator of whether a disabled adult who receives Social Security benefits is capable of managing his or her benefits is evidence of real-world performance of meeting his or her own basic needs, rather than an office-based assessment of financial competence, says a new report from the National Academies of Sciences, Engineering, and Medicine.
To ensure the Comprehensive Everglades Restoration Plan (CERP) is responsive to changing environmental conditions like climate change and sea-level rise, as well as to changes in water management, a new report by the National Academies of Sciences, Engineering, and Medicine calls for a re-examination of the program’s original restoration goals and recommends a forward-looking, systemwide analysis of Everglades restoration outcomes across a range of scenarios.
A new report from the National Academies of Sciences, Engineering, and Medicine offers a rigorous review of scientific research published since 1999 about what is known about the health impacts of cannabis and cannabis-derived products – such as marijuana and active chemical compounds known as cannabinoids – ranging from their therapeutic effects to their risks for causing certain cancers, diseases, mental health disorders, and injuries.
A comprehensive aviation safety system as envisioned by NASA would require integration of a wide range of systems and practices, including building an in-time aviation safety management system (IASMS) that could detect and mitigate high-priority safety issues as they emerge and before they become hazards, says a new report by the National Academies of Sciences, Engineering, and Medicine.
The National Academy of Sciences (NAS) announces the appointment of May R. Berenbaum as Editor-in-Chief of the Proceedings of the National Academy of Sciences (PNAS), the official journal of the Academy. Berenbaum will begin the editorship on January 1, 2019.
NASA’s investment in new instruments to analyze extraterrestrial samples is insufficient to provide for replacement of existing instruments, says a new report from the National Academies of Sciences, Engineering, and Medicine.
A new report from the National Academies of Sciences, Engineering, and Medicine offers guidance to the U.S. Environmental Protection Agency to inform the next revision of a permit program that requires industries to manage stormwater to minimize discharges of pollutants to the environment.
A new report from the National Academies of Sciences, Engineering, and Medicine examines the effects and efficacy of using dispersants in marine oil spill response.
Sethuraman “Panch” Panchanathan, executive vice president and chief research and innovation officer at Arizona State University (ASU), and ASU’s named representative to the National Academies’ Government-University-Industry-Research Roundtable (GUIRR), has been nominated by President Trump to serve as the next director of the National Science Foundation.
Symend, a Canada-based digital engagement platform, has raised USD 52 million to identify customers having trouble with their bills to keep them from defaulting.