The Center for Tropical Forest Science, which manages a global network of temperate and tropical forest research plots, will utilize the funds to conduct workshops in the Americas and Asia to investigate how taxonomic, functional, and genetic dimensions of diversity affect tree communities and their resilience to global change.

The post Center for Tropical Forest Science receives grant to study diversity of tree communities appeared first on Smithsonian Insider.

Nearly 60 million years ago rainforests prospered at temperatures that were 3-5 degrees higher and at atmospheric carbon dioxide levels 2.5 times today’s levels.

The post Plant diversity in tropical forests increased during ancient global warming event appeared first on Smithsonian Insider.

The post Community ecologist Sunshine Van Bael explains her work in Panama with leafcutting ants appeared first on Smithsonian Insider.

Soon after a dirt road through the forests of Lambir Hills National Park in Borneo was improved in 1987, local markets selling the meat of […]

The post Loss of animals spells doom for diversity of rainforest trees appeared first on Smithsonian Insider.

Tucked into the wooded landscape and rolling hills of the Smithsonian Environmental Research Center in Edgewater, Md., is a new forest. Six months ago, a […]

The post Century-long Smithsonian experiment tests forest diversity appeared first on Smithsonian Insider.

A 57-acre research plot at a University of Michigan forest preserve northwest of Ann Arbor has been added to a Smithsonian Institution global network used […]

The post University of Michigan forest preserve joins Smithsonian global network appeared first on Smithsonian Insider.

Pollinators like butterflies, bees, beetles, flies, and moths help to pollinate almost 80 percent of the world’s flowering plants, one benefit of which is providing […]

The post Oasis in the city appeared first on Smithsonian Insider.

The Smithsonian’s National Museum of Natural History announced today that scientists with the museum’s Global Genome Initiative will attempt to capture the genomic diversity of half the […]

The post Smithsonian and Partners To Preserve Earth’s Genomic Plant Diversity appeared first on Smithsonian Insider.

This year’s El Niño event is one of the strongest on record and is still ramping up. Large parts of the tropics are turning into […]

The post Major El Nino Perfect opportunity for Global Change Research appeared first on Smithsonian Insider.

With net in hand and eyes peeled, Mauren Turcatel spent two-weeks last October chasing blood-thirsty predators through the Amazon jungle of Brazil. One-by-one they appeared […]

The post Blood-thirsty jungle horse-flies catch big chill from Smithsonian entomologist appeared first on Smithsonian Insider.

Profound ideas don’t need to be complicated. A simple cube made of aluminum tubing, a centerpiece of a new exhibit “Life in One Cubic Foot,” […]

The post From Rochester to Polynesia, a simple cube unveils Earth’s dazzling biological diversity appeared first on Smithsonian Insider.

Coastal marine environments are impacted by human disturbance. Dock pilings allow MarineGEO researchers to study these impacts in a standardized way around the world to […]

The post The incredible marine diversity under boat docks appeared first on Smithsonian Insider.

Zebra mussels in the Great Lakes, lionfish in the Atlantic and pythons in the Everglades: Large creatures like these generally draw the spotlight when talking […]

The post DNA is trusty new weapon for detecting slime nets and other invasive marine parasites appeared first on Smithsonian Insider.

The post Global forest network cracks the case of tropical biodiversity appeared first on Smithsonian Insider.

Visitors to the tropics are amazed by the huge variety of colorful, complex and sometimes ferocious creatures living near the equator. Smithsonian scientists and colleagues […]

The post Is This the Long-Sought Answer to the Question of Tropical Biodiversity? 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 […]

The post Too many hungry deer are lowering diversity of native plants in eastern U.S. forests appeared first on Smithsonian Insider.

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 […]

The post Ant colony ‘personality’ may play role in survival of its host plant appeared first on Smithsonian Insider.

Each year from summer into fall, ornamental crape myrtle trees in the southern and central U.S. lay out a visual feast of vibrant flowers in […]

The post Crape myrtle trees aren’t native to the US, but hungry native birds still find them tasty appeared first on Smithsonian Insider.

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.

In a Model block, if the instance-specific value of a model argument has an anonymous structure type, an update diagram reports an error when there are multiple bus types that match that anonymous structure type.This bug exists in the following release(s):
R2020a

This bug has a workaround

Interested in Upgrading?

When creating a System Composer architecture model, if the following functions are called with an invalid or missing stereotype, it can cause the model to get corrupted and might lead to a MATLAB crash:

• addComponent
• addPort
• connect

Experimental electron-density studies based on high-resolution diffraction experiments allow halogen bonds between heavy halogens to be classified. The topological properties of the electron density in Cl⋯Cl contacts vary smoothly as a function of the inter­action distance. The situation is less straightforward for halogen bonds between iodine and small electronegative nucleophiles, such as nitro­gen or oxygen, where the electron density in the bond critical point does not simply increase for shorter distances. The number of successful charge–density studies involving iodine is small, but at least individual examples for three cases have been observed. (a) Very short halogen bonds between electron-rich nucleophiles and heavy halogen atoms resemble three-centre–four-electron bonds, with a rather symmetric heavy halogen and without an appreciable σ hole. (b) For a narrow inter­mediate range of halogen bonds, the asymmetric electronic situation for the heavy halogen with a pronounced σ hole leads to rather low electron density in the (3,−1) critical point of the halogen bond; the properties of this bond critical point cannot fully describe the nature of the associated inter­action. (c) For longer and presumably weaker contacts, the electron density in the halogen bond critical point is only to a minor extent reduced by the presence of the σ hole and hence may be higher than in the aforementioned case. In addition to the electron density and its derived properties, the halogen–carbon bond distance opposite to the σ hole and the Raman frequency for the associated vibration emerge as alternative criteria to gauge the halogen-bond strength. We find exceptionally long C—I distances for tetra­fluoro­diiodo­benzene molecules in cocrystals with short halogen bonds and a significant red shift for their Raman vibrations.

An error in an equation in the paper by Song et al. [Acta Cryst. (2019), C75, 1353–1358] is corrected.

The positional change of nitro­gen-7 of the RNA constituent guanosine to the bridgehead position-5 leads to the base-modified nucleoside 5-aza-7-de­aza­guanosine. Contrary to guanosine, this mol­ecule cannot form Hoogsteen base pairs and the Watson–Crick proton donor site N3—H becomes a proton-acceptor site. This causes changes in nucleobase recognition in nucleic acids and has been used to construct stable `all-purine' DNA and DNA with silver-mediated base pairs. The present work reports the single-crystal X-ray structure of 7-iodo-5-aza-7-de­aza­guanosine, C10H12IN5O5 (1). The iodinated nucleoside shows an anti conformation at the glycosylic bond and an N conformation (O4'-endo) for the ribose moiety, with an anti­periplanar orientation of the 5'-hy­droxy group. Crystal packing is controlled by inter­actions between nucleobase and sugar moieties. The 7-iodo substituent forms a contact to oxygen-2' of the ribose moiety. Self-pairing of the nucleobases does not take place. A Hirshfeld surface analysis of 1 highlights the contacts of the nucleobase and sugar moiety (O—H⋯O and N—H⋯O). The concept of pK-value differences to evaluate base-pair stability was applied to purine–purine base pairing and stable base pairs were predicted for the construction of `all-purine' RNA. Furthermore, the 7-iodo substituent of 1 was functionalized with benzo­furan to detect motional constraints by fluorescence spectroscopy.

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

The inversion of X-ray reflectivity to reveal the topography of a one-dimensional interface is evaluated through model calculations.

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.

Here’s what’s planned for chemical and laboratory safety at the ACS National Meeting in San Diego, which starts on Sunday. You can also take advantage of the Division of Chemical Health & Safety’s printer-friendly CHAS-At-A-Glance. Sunday, Aug. 25 Committee on Chemical Safety Open and Executive Subcommittee Meeting, 7:00–10:00 am, Marriott Marquis San Diego Marina, Marina […]

The post #Chemsafety at #ACSSanDiego appeared first on CENtral Science.

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(The Paypers) Menlo Security, a global enterprise cloud security provider, has entered the Australian...

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(The Paypers) Acuant, a global identity verification solutions provider, has teamed up with

(The Paypers) A new survey suggests the majority of Canadians remain worried about the security of their personal information online.

The US Federal Reserve has created a new group to advise on its planned faster payments service, the FedNow...

In this file photo, students warm up in a mariachi class at Hamilton High School.; Credit: Susanica Tam for KPCC

Los Angeles Unified's arts education leaders took steps to renew long-dormant community partnerships with arts organizations Wednesday, part of an effort to revitalize arts education in the nation’s second largest school district. 

At the Los Angeles Cathedral in downtown L.A., the district's new arts ed director, Rory Pullens, held his first meeting with community arts organizations. More than 100 people representing several dozen groups attended the event.

Pullens outlined the district's arts plans and how community partners can help boost the arts for students.

“Guess what," Pullens said, getting a round of applause with cheers of support from some of the attendees. "We're back." 

RELATED: LAUSD decision ushers in new source of funding for arts education

Pullens lauded the district's recent announcement clearing the way for arts funding for low-income students, and pointed to new allocations this year that helped some of the district's schools purchase items like art supplies.

He also said the district is working on a school survey to create an arts equity index that will change the way the district allocates arts funds. The index would measure how well schools are providing arts instruction and arts access to students. Originally planned for release last year, the index is now expected next month.

But Pullens also painted a grim picture of the district’s current arts offerings. He said about a third of the district's middle schools currently offer little or no exposure to the arts. Some of the district’s students can go through both elementary and middle school without taking a single arts class, he said. Because of gaps in arts instruction, students who start learning an instrument in elementary school, for example, might not have classes to continue music study in their middle or high schools.

Pullens further talked about widespread budget problems, but took district leaders to task for failing to restore arts funding to the budget as the recession eased.

He said the arts education branch is still facing a deficit. Superintendent Ramon Cortines told reporters recently that the district as a whole is looking at a $160 million shortfall heading into the 2015-2016 school  year.

Despite the mixed funding news, for many in attendance, the meeting marked a positive shift in the district's arts strategy. Some groups currently serve as partners with the district, but the gathering was the first major effort in several years to reach out to organizations with the aim of restoring arts in the schools.

Jay McAdams, the executive director of 24th Street Theatre, said he remembered a few years back when the district emailed a cease-and-desist letter calling for an end to all arts partnership programs. He saw Wednesday's meeting as a major turnaround. 

"This is just a real breath of fresh air. There’s hope, there’s hope for first time in a long time for arts," he said. 

This content is from Southern California Public Radio. View the original story at SCPR.org.

The studio arts program at California Lutheran University in Thousand Oaks, Calif., includes courses in painting. ; Credit: Photo courtesy of Cal Lutheran/Brian Stethem

California Lutheran University in Thousand Oaks has taken the first steps toward building a new, art center with a commitment of at least $8 million in contributions and matching funds.

Over the weekend, the university's board of regents voted to spend $300,0o0 on design and planning for the new project. The complex will include offices and art studios in about 25,000 to 30,000 square feet of space.

RELATED: Top 10 arts education stories for 2014

The center will be the new home for the school's art department, which is currently spread out across the campus. 

"The facilities that they're in now are really not optimal," said Karin Grennan, the media relations manager for the university. 

The school offers instruction in studio arts, design and commercial art, digital art and art history. 

Grennan said the new project will add to the university's recent art initiatives: in 2012, the faculty members launched an art conference that's attracted international interest. Two conferences have been held so far and the next one will take place in November. The university is also raising funds to build a new performing art center on campus. 

Art collector and real estate developer William Rolland pledged up to $4 million toward the art center project, an amount the university will match. 

Rolland has previously donated money to the university, including contributions for the football stadium and art gallery. Rolland spent several decades as a real estate developer in Ventura County, and once lived in Thousand Oaks. 

This content is from Southern California Public Radio. View the original story at SCPR.org.

Elisa Reimer
Apr 23, 2020; 134:jcs246421-jcs246421
Articles

Björn Eismann
Apr 15, 2020; 0:jcs.245043v1-jcs.245043
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