For centuries untold numbers of this tiny arachnid (cousin to spiders and ticks) have ended up in teapots, invisibly steeping alongside the leaves of the tea plant on which it lives.

The post Primitive, bizarre, beautiful: New mite species reveal a lost world awaiting discovery appeared first on Smithsonian Insider.

Residents of the southeastern United States might occasionally come across an oddity along a barbed-wire fence: a series of insects, mice or even small birds […]

The post Tiny, fierce and disappearing: breeding program aims to help the loggerhead shrike appeared first on Smithsonian Insider.

“When you can’t breathe, nothing else matters,” once a tagline of the American Lung Association, today it might easily describe what is happening in many […]

The post Gasping for air: nutrients, warming trigger ocean oxygen deficit appeared first on Smithsonian Insider.

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 […]

The post Study: Managed beehives can discourage crop-raiding elephants appeared first on Smithsonian Insider.

At the approach of a hungry parrot snake, a tree frog egg transforms from a haven to a prison. With no parent to offer protection, […]

The post Mystery solved: frogs use snout glands in emergency jail break appeared first on Smithsonian Insider.

A newly discovered Hawaiian tree recently had the distinction of being added to the International Union for the Conservation of Nature’s Red List of Critically […]

The post Newly named, Hawaiian tree species already critically endangered appeared first on Smithsonian Insider.

If you are a plant, when life aboveground turns harsh, you have few options. Some orchids respond by going dormant, spending years to decades underground […]

The post Dormant Orchids Need Fungi to Rise Again appeared first on Smithsonian Insider.

Rainforests on infertile wet soils support more than half of all plant species. Shrublands on infertile dry soils in southwestern Australia, jokingly called “knee-high tropical […]

The post Microbes rule in ‘knee-high tropical rainforests’ appeared first on Smithsonian Insider.

Earth Day is coming up, and this year, the Smithsonian has a different take on it. It has invited more than 150 scientists, thought leaders, […]

The post Earth Optimism Summit to showcase steady, positive gains in conservation appeared first on Smithsonian Insider.

Smithsonian scientists have discovered two new gecko species—the Lenya banded bent-toed gecko (Cyrtodactylus lenya) and Tenasserim Mountain bent-toed gecko (C. payarhtanesnsis)—in the little-studied lowland forests […]

The post Smithsonian Scientists Discover Two New Gecko Species in Vanishing Myanmar Rainforest appeared first on Smithsonian Insider.

Smithsonian’s MarineGEO (Marine Global Earth Observatory) conducts long-term research around the world on coastal marine ecosystems, including at their field station on Carrie Bow Cay […]

The post MarineGEO Field Campaign: Belize appeared first on Smithsonian Insider.

Hidden in plain sight–that’s how researchers describe their discovery of a new genus of large forest tree commonly found, yet previously scientifically unknown, in the […]

The post Remarkable new tree species was “hidden in plain sight” in the Andes appeared first on Smithsonian Insider.

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.

Millions, if not billions, of specimens reside in the world’s natural history collections, but most of these have not been carefully studied, or even looked […]

The post Using digitized Botany specimens, AI excels in simple curatorial tasks appeared first on Smithsonian Insider.

No green thumb? You don’t need to water these dazzling orchids to enjoy them. More than 8,000 living specimens in the Smithsonian Gardens Orchid Collection […]

The post See thousands of orchids in incredible detail in the Smithsonian’s newly digitized collection appeared first on Smithsonian Insider.

This article aims to encourage practitioners, young and seasoned, by enhancing their structure-determination toolboxes with a selection of tips and tricks on recognizing and handling aspects of data collection, structure modelling and refinement, and the interpretation of results.

This work presents a technique for extracting the detailed shape of peaks with extended, overlapping tails in an X-ray powder diffraction pattern. The application discussed here concerns crystallite size broadening, though the technique can be applied to spectra of any origin and without regard to how the profiles are to be subsequently analyzed. Historically, the extraction of profile shapes has been difficult due to the complexity of determining the background under the peak, resulting in an offset of the low-frequency components of the Fourier transform of the peak known as the `hook' problem. The use of a carefully considered statistical weighting function in a non-linear least-squares fit, followed by summing the residuals from such a fit with the fit itself, allows one to extract the full shape of an isolated peak, without contributions from either the background or adjacent peaks. The extracted shape, consisting of the fit function recombined with the residuals, is not dependent on any specific shape model. The application of this to analysis of microstructure is performed independently of global parametric models, which would reduce the number of refined parameters; therefore the technique requires high-quality data to produce results of interest. The effectiveness of the technique is demonstrated by extraction of Fourier transforms of peaks from two sets of size-broadened materials with two differing pieces of equipment.

It is shown how to reconstruct the stacking sequence from the pairwise correlation functions between layers in close-packed structures. First, of theoretical interest, the analytical formulation and solution of the problem are presented when the exact pairwise correlation counts are known. In the second part, the practical problem is approached. A simulated annealing procedure is developed to solve the problem using as initial guess approximate solutions from previous treatments. The robustness of the procedure is tested with synthetic data, followed by an experimental example. The developed approach performs robustly over different synthetic and experimental data, comparing favorably with the reported methods.

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?

Attempting to display the contents of an HDF5 file containing fixed-length UTF-8 encoded strings results in an unexpected error in MATLAB.

For example, the following code

  h5disp('myHDF5FileWithFixedLenUTF8Strings.h5')

returns this error:

Error using h5infoc
UTF-8 encoding is only supported for variable length strings.

Error in h5info (line 108)
hinfo = h5infoc(filename,location, useUtf8);

Error in h5disp>display_hdf5 (line 121)
hinfo = h5info(options.Filename,options.Location);

Error in h5disp (line 99)
display_hdf5(options);

Simulink might produce an incorrect sorted order for a model that meets all of the following conditions:

• The model contains blocks from the SoC Blockset
• The Signal logging option is selected in the model configuration set
• Signals using asynchronous sample time are configured for logging

In small-molecule single-crystal structure determination, we now have at our disposal an inspiring range of fantastic diffractometers with better, brighter sources, and faster, more sensitive detectors. Faster and more powerful computers provide integrated tools and software with impressive graphical user interfaces. Yet these tools can lead to the temptation not to check the work thoroughly and one can too easily overlook tell-tale signs that something might be amiss in a structure determination; validation with checkCIF is not always revealing. This article aims to encourage practitioners, young and seasoned, by enhancing their structure-determination toolboxes with a selection tips and tricks on recognizing and handling aspects that one should constantly be aware of. Topics include a pitfall when setting up data collections, the usefulness of reciprocal lattice layer images, processing twinned data, tips for disorder modelling and the use of restraints, ensuring hydrogen atoms are added to a model correctly, validation beyond checkCIF, and the derivation and interpretation of the final results.

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.

Host Jon Stewart of Comedy Central's "The Daily Show with Jon Stewart" watches a video while taping "The Daily Show with Jon Stewart: Restoring Honor & Dignity to the White House" at the McNally Smith College of Music Sept. 5, 2008 in St. Paul, Minnesota.; Credit: Ethan Miller/Getty Images for Comedy Central

Host Jon Stewart announced at Tuesday's "The Daily Show" taping that he is leaving the show.

Comedy Central confirmed the news in a statement, saying that Stewart will be leaving later this year:

"For the better part of the last two decades, we have had the incredible honor and privilege of working with Jon Stewart. His comedic brilliance is second to none. Jon has been at the heart of Comedy Central, championing and nurturing the best talent in the industry, in front of and behind the camera. Through his unique voice and vision, ‘The Daily Show’ has become a cultural touchstone for millions of fans and an unparalleled platform for political comedy that will endure for years to come. Jon will remain at the helm of ‘The Daily Show’ until later this year. He is a comic genius, generous with his time and talent, and will always be a part of the Comedy Central family."

The news comes less than two months after Stephen Colbert brought "The Colbert Report" to an end in order to prepare for hosting CBS's "Late Show," replacing David Letterman after he leaves later this year.

"The Daily Show" existed before Jon Stewart, hosted from 1996 until 1998 by Craig Kilborn, but Stewart took the show into a bolder political direction and made it a cultural landmark, becoming the go-to news source for numerous young people. Polls started to show Jon Stewart as being one of the most trusted newsmen in America.

It's just over three weeks after Comedy Central launched "The Nightly Show" with Larry Wilmore and details have yet to be announced about the future of Comedy Central's late night lineup.

The show has created hosts for other networks, with Colbert leaving for CBS after getting his start as a "Daily Show" correspondent and John Oliver, who served as a fill-in host while Stewart shot the film "Rosewater," left for his own weekly rundown of the news "Last Week Tonight" at HBO. The show's starmaking power also includes actors such as Steve Carell, Ed Helms and more, and new "Saturday Night Live" Weekend Update anchor Michael Che.

Stewart didn't announce his plans for what comes next. He directed the 2014 film "Rosewater," based on journalist Maziar Bahari's memoir detailing his imprisonment in Iran following an interview with "The Daily Show's" Jason Jones.

Stewart previously talked about "Rosewater" with KPCC's "The Frame," saying at the time that "The Daily Show" isn't all fun.

"As sad as it sounds, people might say, 'Man, working at 'The Daily Show,' that's gotta be a blast. You just sit around and laugh all day,'" Stewart said. "And you're like, 'No, we have a meeting at 9, and the 9 meeting has to be over by 9:30, and the scripts have to be in by 11, because if they're not, then we miss this deadline.'"

He also told the Hollywood Reporter last summer that he didn't know how much longer he would stay with the show.

"I mean, like anything else, you do it long enough, you will take it for granted, or there will be aspects of it that are grinding. I can't say that following the news cycle as closely as we do and trying to convert that into something either joyful or important to us doesn't have its fraught moments," Stewart said.

The show, one of Comedy Central's top franchises, will likely continue. John Oliver and Stephen Colbert would have seemed like the heirs apparent before they left; of the current staff, Samantha Bee, Jason Jones and Aaasif Mandvi are the longest-running correspondents, with Bee starting all the way back in 2003. Jones filled in for Stewart as anchor last fall, assisted by his wife Samantha Bee, when Stewart was out sick.

The show has also pushed for expanded diversity in its own cast, along with launching "The Nightly Show" with a black host and a minority panel, so that could point to a more diverse host in the future. The show has also recently expanded its international perspective, with Trevor Noah covering international news, Hasan Minhaj as the new Indian correspondent and Egyptian satirist Bassem Youssef joining as a Middle East correspondent.

Correction: An earlier version of this story referred to "Rosewater" as a documentary; it is a drama, based on Maziar Bahari's memoir. KPCC regrets the error.

This story has been updated.

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

Structure-mining finds and returns the best-fit structures from structural databases given a measured pair distribution function data set. Using databases and heuristics for automation it has the potential to save experimenters a large amount of time as they explore candidate structures from the literature.

To describe multiple Bragg reflection from a thick, ideally imperfect crystal, the transport equations are reformulated in three-dimensional phase space and solved by spectral collocation in the depth coordinate. Example solutions illustrate the orientational spread of multiply reflected rays and the distortion of rocking curves, especially for finite detectors.

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 Paypers) Yoti has revealed a pair of partnerships to provide solutions combining its biometric technology...

(The Paypers) CredoLab has partnered with iovation to integrate

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

File: California school employees can now take their required training to spot child abuse and neglect by going online.; Credit: Cayoup/Flickr

Public school employees can take their required annual training to spot child abuse or neglect online, California State Superintendent of Public Instruction Tom Torlakson announced Monday.

“Nothing is more important than the safety of our students,” Torlakson said in a written statement. “The new online training lessons will help school employees carry out their responsibilities to protect children and take action if they suspect abuse or neglect.”

A new California law requires school employees, including teachers, teacher aides, and substitute teachers, to show proof to their employers that they’ve taken the training.

“We were hearing anecdotally that there may have been suspicions of abuse and neglect that was not always reported and we wanted to do something about that issue,” said Stephanie Papas, a California Department of Education consultant.

Recent high-profile cases, such as that of former Miramonte Elementary teacher Mark Berndt, revealed that school employees failed to report allegations of abuse. Los Angeles Unified agreed to pay a record $140 million to settle claims filed by one group of students in the case and $30 million to a second group. Berndt is serving a 25-year sentence after pleading no contest to the charges of committing lewd acts on children.

Papas, who helped create the new two-hour online training, said the course will help employees tell if a child has been hurt from abuse or from an accident, for example.

“We have photos that are examples of, say, a welt that is in the shape of a belt buckle or a slap on a child’s cheek that’s left a hand imprint,” she said.

In-person trainings are more effective, she said, but they’re more expensive than online trainings. That pushed the Department of Education to provide the free online training for school districts still under budget constraints.

She said current employees have until this fall to show their school districts proof that they’ve taken the training.

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

Full Text:

The same artificial intelligence technique typically used in facial recognition systems could help improve prediction of hailstorms and their severity, according to a new, National Science Foundation-funded study. Instead of zeroing in on the features of an individual face, scientists trained a deep learning model called a convolutional neural network to recognize features of individual storms that affect the formation of hail and how large the hailstones will be, both of which are notoriously difficult to predict. The promising results highlight the importance of taking into account a storm's entire structure, something that's been challenging to do with existing hail-forecasting techniques.

Image credit: Carlye Calvin

Full Text:

Many wild southern sea otters in California are infected with the parasite Toxoplasma gondii, yet the infection is fatal for only a fraction of sea otters, which has long puzzled the scientific community. A National Science Foundation-funded study identifies the parasite's specific strains that are killing southern sea otters, tracing them back to a bobcat and feral domestic cats from nearby watersheds. The study marks the first time a genetic link has been clearly established between the Toxoplasma strains in felid hosts and parasites causing fatal disease in marine wildlife. The study's results highlight how infectious agents like Toxoplasma can spread from cat feces on land to the sea, leading to detrimental impacts on marine wildlife.

Image credit: Trina Wood/UC Davis