RT America employees found out Wednesday there would be no live programming and were told by management to come back to the office at noon Thursday for more information, according to a person familiar with the matter. There was a brief meeting led by news director Mikhail Solodovnikov, who informed employees RT America was shutting down immediately, the person said.

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Polarized Light and Polarization Vision in Animal Sciences covers advances made since the 2004 Springer volume Polarized Light in Animal Vision edited by Horváth and Varjú, but also provides reviews and synopses of some areas. Part I examines polarization sensitivity across many animal taxa including vertebrates and invertebrates and details both terrestrial and aquatic life. Part II is devoted to the description of polarized light in nature and explores how the physics of light must be taken into account when understanding how polarized light is detected by the visual system. This includes underwater polarization due to scattering; polarization patterns reflected from freshwater bodies; polarization characteristics of forest canopies; normal and anomalous polarization patterns of the skies; skylight polarization transmitted through Snell's window and both linearly and circularly polarized signals produced by terrestrial and aquatic animals. This Part also examines polarized "light pollution" induced by anthropogenic factors such as reflection off asphalt surfaces, glass panes, car bodies, and other man-made structures that are now known to form ecological traps for polarotactic insects. Part III surveys some of the practical applications of polarization vision including polarization-based traps for biting insects, ground-based polarimetric cloud detectors and an historical examination of the navigational abilities of Viking seafarers using the sky polarization compass. The deterrent qualities of ungulate pelage to polarization-sensitive biting insects is also examined in this section.

The news caught some employees off guard. They speculated that program cutbacks could follow the actions taken by DirecTV and Roku but didn't expect a full-scale shutdown, two of the people said.

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RT America is an English-language sister network of RT, the Russian state-owned news channel. It's operated by Russia-backed T&R Productions, which sent a memo Thursday to more than 100 employees informing them their employment will end on May 3, according to a person familiar with the matter.

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Polarized Light and Polarization Vision in Animal Sciences covers advances made since the 2004 Springer volume Polarized Light in Animal Vision edited by Horváth and Varjú, but also provides reviews and synopses of some areas. Part I examines polarization sensitivity across many animal taxa including vertebrates and invertebrates and details both terrestrial and aquatic life. Part II is devoted to the description of polarized light in nature and explores how the physics of light must be taken into account when understanding how polarized light is detected by the visual system. This includes underwater polarization due to scattering; polarization patterns reflected from freshwater bodies; polarization characteristics of forest canopies; normal and anomalous polarization patterns of the skies; skylight polarization transmitted through Snell's window and both linearly and circularly polarized signals produced by terrestrial and aquatic animals. This Part also examines polarized "light pollution" induced by anthropogenic factors such as reflection off asphalt surfaces, glass panes, car bodies, and other man-made structures that are now known to form ecological traps for polarotactic insects. Part III surveys some of the practical applications of polarization vision including polarization-based traps for biting insects, ground-based polarimetric cloud detectors and an historical examination of the navigational abilities of Viking seafarers using the sky polarization compass. The deterrent qualities of ungulate pelage to polarization-sensitive biting insects is also examined in this section.

Conservation Land Management (CLM) is a quarterly magazine that is widely regarded as essential reading for all who are involved in land management for nature conservation, across the British Isles. CLM includes long-form articles, events listings, publication reviews, new product information and updates, reports of conferences and letters.

"As a result of unforeseen business interruption events, T&R Productions LLC will be ceasing production and, therefore, must lay off most of its staff who work at all its locations," wrote Misha Solodovnikov, T&R Productions' General Manager, in a note to employees. "We anticipate this lay off will be permanent."

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The U.S. cable news network RT America informed its employees that it's halting operations immediately and laying off almost all staff, according to a memo obtained by CNBC.

DirecTV, the largest U.S. satellite-TV operator, stopped carrying RT America earlier this week — a decision based on Russia's attack on Ukraine. Roku followed DirecTV's lead by removing the network from its Roku Channel Store.

British Wildlife is the leading natural history magazine in the UK, providing essential reading for both enthusiast and professional naturalists and wildlife conservationists. Published eight times a year, British Wildlife bridges the gap between popular writing and scientific literature through a combination of long-form articles, regular columns and reports, book reviews and letters.

Part I. Polarization vision in animals and humansPart II. Polarized light in nature with implications to animal polarization visionPart III. Practical applications of polarization vision and polarization patterns