65 research outputs found
Macular pigment Raman detector for clinical applications
Journal ArticleClinical studies of carotenoid macular pigments (MP) have been limited by the lack of noninvasive, objective instruments. We introduce a novel noninvasive optical instrument, an MP Raman detector, for assessment of the carotenoid status of the human retina in vivo. The instrument uses resonant excitation of carotenoid molecules in the visible wavelength range, and quantitatively measures the highly specific Raman signals that originate from the single- and double-bond stretch vibrations of the pi-conjugated carotenoid molecule's carbon backbone. The instrument is a robust, compact device and suitable for routine measurements of MP concentrations in a clinical setting. We characterized and tested the instrument in clinical studies of human subjects to validate its function and to begin to establish its role as a possible screening test for macular pathologies. We also show that the MP Raman spectroscopy technology has potential as a novel, highly specific method for rapid screening of carotenoid antioxidant levels in large populations at risk for vision loss from age-related macular degeneration, the leading cause of blindness of the elderly in the developed world
Testing eigenstate decoherence hypothesis in a model of collisional decoherence
The eigenstate decoherence hypothesis (EDH) asserts that each individual
eigenstate of a large closed system is locally classical-like. We test this
hypothesis for a heavy particle interacting with a gas of light particles. This
system is paradigmatic for studies of the quantum-to-classical transition: The
reduced state of the heavy particle is widely believed to rapidly loose any
nonclassical features due to the interaction with the gas. Yet, we find
numerical evidence that the EDH is violated: certain eigenstates of this model
are manifestly non-classical. Only the weak version of EDH referring to the
majority (instead of the totality) of eigenstates holds
Π‘ΠΈΠ±ΠΈΡΡΠΊΠΈΠΉ ΡΠΈΡ ΠΠΎΠ»ΠΆΡΠΊΠΎΠΉ ΡΠ²Π΅ΡΠ΄ΡΠ½ΠΈ
On the fundamental work βThe Siberian Shield of the Volga Strongholdβ, telling about the contribution of the Siberians and the Far-Easterns to the defeat of Nazi invaders and their Hungarian, Romanian, Italian satellites and the Spanish βBlue Divisionβ on the banks of Volga, the Great Russian River.Π ΡΡΠ½Π΄Π°ΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠΌ ΡΡΡΠ΄Π΅ Β«Π‘ΠΈΠ±ΠΈΡΡΠΊΠΈΠΉ ΡΠΈΡ ΠΠΎΠ»ΠΆΡΠΊΠΎΠΉ ΡΠ²Π΅ΡΠ΄ΡΠ½ΠΈΒ», ΠΏΠΎΠ²Π΅ΡΡΠ²ΡΡΡΠ΅ΠΌ ΠΎ Π²ΠΊΠ»Π°Π΄Π΅ ΡΠΈΠ±ΠΈΡΡΠΊΠΎΠ² ΠΈ Π΄Π°Π»ΡΠ½Π΅Π²ΠΎΡΡΠΎΡΠ½ΠΈΠΊΠΎΠ² Π² ΡΠ°Π·Π³ΡΠΎΠΌ Π³ΠΈΡΠ»Π΅ΡΠΎΠ²ΡΠΊΠΈΡ
Π·Π°Ρ
Π²Π°ΡΡΠΈΠΊΠΎΠ² ΠΈ ΠΈΡ
Π²Π΅Π½Π³Π΅ΡΡΠΊΠΈΡ
, ΡΡΠΌΡΠ½ΡΠΊΠΈΡ
, ΠΈΡΠ°Π»ΡΡΠ½ΡΠΊΠΈΡ
ΡΠ°ΡΠ΅Π»Π»ΠΈΡΠΎΠ² ΠΈ ΠΈΡΠΏΠ°Π½ΡΠΊΠΎΠΉ Β«ΠΠΎΠ»ΡΠ±ΠΎΠΉ Π΄ΠΈΠ²ΠΈΠ·ΠΈΠΈΒ» Π½Π° Π±Π΅ΡΠ΅Π³Π°Ρ
Π²Π΅Π»ΠΈΠΊΠΎΠΉ ΡΡΡΡΠΊΠΎΠΉ ΡΠ΅ΠΊΠΈ ΠΠΎΠ»Π³ΠΈ
Π‘ΠΈΠ±ΠΈΡΡΠΊΠΈ - Π·Π°ΡΠΈΡΠ½ΠΈΠΊΠΈ ΠΈ ΠΏΠΎΠ±Π΅Π΄ΠΈΡΠ΅Π»ΠΈ
Review of publication "Siberians in the battle for Moscow", which is part of the anthology "Tobolsk, and the whole of Siberia", published by the Public Charitable Foundation "Revival of Tobolsk."ΠΠ±Π·ΠΎΡ ΠΈΠ·Π΄Π°Π½ΠΈΡ Β«Π‘ΠΈΠ±ΠΈΡΡΠΊΠΈ Π² Π±ΠΈΡΠ²Π΅ Π·Π° ΠΠΎΡΠΊΠ²ΡΒ», Π²Ρ
ΠΎΠ΄ΡΡΠ΅Π³ΠΎ Π² ΡΠΎΡΡΠ°Π² Π°Π»ΡΠΌΠ°Π½Π°Ρ
Π° Β«Π’ΠΎΠ±ΠΎΠ»ΡΡΠΊ ΠΈ Π²ΡΡ Π‘ΠΈΠ±ΠΈΡΡΒ», Π²ΡΠΏΡΡΠ΅Π½Π½ΠΎΠ³ΠΎ ΠΠ±ΡΠ΅ΡΡΠ²Π΅Π½Π½ΡΠΌ Π±Π»Π°Π³ΠΎΡΠ²ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΡΠΌ ΡΠΎΠ½Π΄ΠΎΠΌ Β«ΠΠΎΠ·ΡΠΎΠΆΠ΄Π΅Π½ΠΈΠ΅ Π’ΠΎΠ±ΠΎΠ»ΡΡΠΊΠ°Β»
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