Russian military correspondent Alexander Kots said that the Russian Armed Forces use Elon Musk's technology in military actions. According to Kots, the Russian military use Starlink satellites in the special military operation zone. "The troops actively use Starlink in the SVO (SVO is a Russian abbreviation for special military operation — ed.). We use it, among other things, for broadcast to command posts, to get images from reconnaissance UAVs,” the military correspondent said. This has significantly raised the level of Russian intelligence, the military correspondent added.

The title mol­ecule, C12H15NO5, is a methyl carbamate derivative obtained by reacting (R)-2-phenyl­glycinol and methyl chloro­formate, with calcium hydroxide as heterogeneous catalyst. Supra­molecular chains are formed in the [100] direction, based on N—H⋯O hydrogen bonds between the amide and carboxyl­ate groups. These chains weakly inter­act in the crystal, and the phenyl rings do not display significant π–π inter­actions.

The receptor ability of diethyl N,N'-(1,3-phenyl­ene)dicarbamate (1) to form host–guest com­plexes with theophylline (TEO) and caffeine (CAF) by mechanochemistry was evaluated. The formation of the 1–TEO com­plex (C12H16N2O4·C7H8N4O2) was preferred and involves the conformational change of one of the ethyl carbamate groups of 1 from the endo conformation to the exo conformation to allow the formation of inter­molecular inter­actions. The formation of an N—H⋯O=C hydrogen bond between 1 and TEO triggers the conformational change of 1. CAF mol­ecules are unable to form an N—H⋯O=C hydrogen bond with 1, making the conformational change and, therefore, the formation of the com­plex impossible. Conformational change and selective binding were monitored by IR spectroscopy, solid-state 13C nuclear magnetic resonance and single-crystal X-ray diffraction. The 1–TEO com­plex was characterized by IR spectroscopy, solid-state 13C nuclear magnetic resonance, powder X-ray diffraction and single-crystal X-ray diffraction.

The title compound, [Mo3(C9H18NS2)3(S2)3S]2S, crystallizes on a general position in the monoclinic space group P21/n (No. 14). The cationic [Mo3S7(S2CNiBu2)3]+ fragments are joined by a mono­sulfide dianion that forms close S⋯S contacts to each of the di­sulfide ligands on the side of the Mo3 plane opposite the μ32− ligand. The two Mo3 planes are inclined at an angle of 40.637 (15)°, which gives the assembly an open clamshell-like appearance. One μ6-S2−⋯S22− contact, at 2.4849 (14) Å, is appreciably shorter than the remaining five, which are in the range 2.7252 (13)–2.8077 (14) Å.

; Credit: LA Johnson/NPR

Undergraduate college enrollment fell again this spring, down nearly 5% from a year ago. That means 727,000 fewer students, according to new data from the National Student Clearinghouse.

"That's really dramatic," says Doug Shapiro, who leads the clearinghouse's research center. Fall enrollment numbers had indicated things were bad, with a 3.6% undergraduate decline compared with a year earlier, but experts were waiting to see if those students who held off in the fall would enroll in the spring. That didn't appear to happen.

"Despite all kinds of hopes and expectations that things would get better, they've only gotten worse in the spring," Shapiro says. "It's really the end of a truly frightening year for higher education. There will be no easy fixes or quick bounce backs."

Overall enrollment in undergraduate and graduate programs has been trending downward since around 2012, and that was true again this spring, which saw a 3.5% decline — seven times worse than the drop from spring 2019 to spring 2020.

The National Student Clearinghouse attributed that decline entirely to undergraduates across all sectors, including for-profit colleges. Community colleges, which often enroll more low-income students and students of color, remained hardest hit by far, making up more than 65% of the total undergraduate enrollment losses this spring. On average, U.S. community colleges saw an enrollment drop of 9.5%, which translates to 476,000 fewer students.

"The enrollment landscape has completely shifted and changed, as though an earthquake has hit the ground," says Heidi Aldes, dean of enrollment management at Minneapolis Community and Technical College, a community college in Minnesota. She says her college's fall 2020 enrollment was down about 8% from the previous year, and spring 2021 enrollment was down about 11%.

"Less students are getting an education"

Based on her conversations with students, Aldes attributes the enrollment decline to a number of factors, including being online, the "pandemic paralysis" community members felt when COVID-19 first hit, and the financial situations families found themselves in.

"Many folks felt like they couldn't afford to not work and so couldn't afford to go to school and lose that full-time income," Aldes says. "There was so much uncertainty and unpredictability."

A disproportionately high number of students of color withdrew or decided to delay their educational goals, she says, adding to equity gaps that already exist in the Minneapolis area.

"Sure, there is a fiscal impact to the college, but that isn't where my brain goes," Aldes says. "There's a decline, which means there are less students getting an education. That is the tragedy, that less students are getting an education, because we know how important education is to a successful future."

To help increase enrollment, her team is reaching out to the high school classes of 2020 and 2021, and they're contacting students who previously applied or previously enrolled and stopped attending. She says she's hopeful the college's in-person offerings — which now make up nearly 45% of its classes — will entice students to come back, and appeal to those who aren't interested in online courses. So far, enrollment numbers for fall 2021 are up by 1%. "We are climbing back," she says.

A widening divide

Despite overall enrollment declines nationally, graduate program enrollments were up by more than 120,000 students this spring. That means there are more students who already have college degrees earning more credentials, while, at the other end of the spectrum, students at the beginning of their higher ed careers are opting out — a grim picture of a widening gap in America.

"It's kind of the educational equivalent of the rich getting richer," Shapiro says. "Those gaps in education and skills will be baked into our economy, and those families' lives, for years to come."

The value of a college degree — and its impact on earning power and recession resilience — has only been reinforced by the pandemic. According to the U.S. Bureau of Labor Statistics, Americans with a college degree were more likely to stay employed during the pandemic, and if they did lose a job, they were more likely to get hired again. Unemployment rates were higher for those without a degree or credential beyond high school.

"Almost all of the income gains and the employment gains for the last decade have gone to people with higher education degrees and credentials," Shapiro says. "Those who are getting squeezed out of college today, especially at community colleges, are just getting further and further away from being able to enjoy some of those benefits."

In the National Student Clearinghouse data, traditional college-aged students, those 18 to 24, were the largest age group missing from undergraduate programs. That includes many students from the high school class of 2020, who graduated at the beginning of the pandemic. Additional research from the Clearinghouse shows a 6.8% decline in college-going rates among the class of 2020 compared to the class of 2019 — that's more than four times the decline between the classes of 2018 and 2019. College-going rates were worse for students at high-poverty high schools, which saw declines of more than 11%.

For the communities and organizations tasked with helping high school graduates transition and succeed in college, the job this year is exponentially harder. Students have always struggled to attend college: "It's not new to us," says Nazy Zargarpour, who leads the Pomona Regional Learning Collaborative, which helps Southern California high school students enroll and graduate from college. "But this year, it's on steroids because of COVID."

Her organization is offering one-on-one outreach to students to help them enroll or re-enroll in college. As part of that effort, Zargarpour and her colleagues conducted research to help them understand why students didn't go on to college during the pandemic.

"Students told us that it's a variety of things, including a lot of just life challenges," she says. "Families being disrupted because of lack of work; families being disrupted because of the challenges of the illness itself; students having to take care of their young siblings; challenges with technology."

The biggest question now: Will those students return to college? Experts say the farther a student gets from their high school graduation, the less likely they are to enroll, because life gets in the way. But Zargarpour is hopeful.

"It will take a little bit of time for us to catch up to normal and better, but my heart can't bear to say all hope is lost for any student ever."

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

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New report finds that GHGs can be reduced significantly through the use of reclaimed refrigerant versus producing and using newly manufactured virgin refrigerant. 

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We used virus-mediated anterograde and retrograde tracing, optogenetic modulation, immunostaining, in situ hybridization, and patch-clamp recordings in acute brain slices to study the release mechanism and μ-opioid modulation of the dual glutamatergic/GABAergic inputs from the ventral tegmental area and supramammillary nucleus to the granule cells of the dorsal hippocampus of male and female mice. In keeping with previous reports showing that the two transmitters are released by separate active zones within the same terminals, we found that the short-term plasticity and pharmacological modulation of the glutamatergic and GABAergic currents are indistinguishable. We further found that glutamate and GABA release at these synapses are both virtually completely mediated by N- and P/Q-type calcium channels. We then investigated μ-opioid modulation of these synapses and found that activation of μ-opioid receptors (MORs) strongly inhibits the glutamate and GABA release, mostly through inhibition of presynaptic N-type channels. However, the modulation by MORs of these dual synapses is complex, as it likely includes also a disinhibition due to downmodulation of local GABAergic interneurons which make direct axo-axonic contacts with the dual glutamatergic/GABAergic terminals. We discuss how this opioid modulation may enhance LTP at the perforant path inputs, potentially contributing to reinforce memories of drug-associated contexts.

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Called M136279841, the value belongs to a rare class of prime numbers called Mersenne primes and was found using a supercomputer system spread across 17 countries