Control of nanopore wetting by a photochromic spiropyran: a light-controlled valve and electrical switch. (1/510)
By modifying the surface of nanoporous alumina membranes using mixtures of a photochromic spiropyran and hydrophobic molecules, it is possible to control the admission of water into the membrane using light. When the spiropyran is in the thermally stable, relatively hydrophobic closed form, the membrane is not wet by an aqueous solution. Upon exposure to UV light, the spiropyran photoisomerizes to the more polar merocyanine form, allowing water to enter the pores and cross the membrane. Thus, the photosensitive membrane acts as a burst valve, allowing the transport of water and ions across the membrane. If the aqueous solution contains ions, then the membrane acts as an electrical switch; photoisomerization leads to a two-order-of-magnitude increase in ionic conductance, allowing a current to flow across the membrane. Exposure to visible light causes photoisomerization of the merocyanine back to the closed, spiro form, but dewetting of the membrane does not occur spontaneously, due to a high activation barrier. (+info)Effect of initiator on photopolymerization of acidic, aqueous dental model adhesives. (2/510)
(+info)Importance of hydrogen-bonding sites in the chiral recognition mechanism between racemic D3 terbium(III) complexes and amino acids. (3/510)
(+info)Site-specific modification by functionality-transfer oligonucleotide with the photo-inducible reactivity. (4/510)
(+info)RNA aptamers that reversibly bind to photoresponsive peptide. (5/510)
(+info)A diazirine-based nucleoside analogue for efficient DNA interstrand photocross-linking. (6/510)
(+info)Structural analysis of the Mn(IV)/Fe(III) cofactor of Chlamydia trachomatis ribonucleotide reductase by extended X-ray absorption fine structure spectroscopy and density functional theory calculations. (7/510)
(+info)UV-Vis spectrophotometric analysis and light irradiance through hot-pressed and hot-pressed-veneered glass ceramics. (8/510)
(+info)Photochemical processes refer to chemical reactions that are initiated or driven by the absorption of light. In these reactions, photons (light particles) interact with molecules, causing electrons in the molecules to become excited and leading to the formation of new chemical bonds or the breaking of existing ones. This results in the creation of different molecular structures or products.
In the context of human health and medicine, photochemical processes can occur both naturally and artificially. For instance, the body uses light-dependent reactions in the process of vision, where light is absorbed by rhodopsin in the retina, triggering a series of chemical events that ultimately lead to visual perception.
Additionally, photochemotherapy is a medical treatment that utilizes photochemical processes to achieve therapeutic effects. In this approach, a photosensitizing agent is administered to a patient, and then exposed to specific wavelengths of light. The light causes the photosensitizer to react with oxygen, generating reactive oxygen species that can destroy targeted cells or tissues, such as cancer cells or bacteria.
Overall, photochemical processes play an essential role in various biological and medical contexts, enabling critical functions like vision and offering promising therapeutic avenues for a range of conditions.
In the context of medical terminology, "light" doesn't have a specific or standardized definition on its own. However, it can be used in various medical terms and phrases. For example, it could refer to:
1. Visible light: The range of electromagnetic radiation that can be detected by the human eye, typically between wavelengths of 400-700 nanometers. This is relevant in fields such as ophthalmology and optometry.
2. Therapeutic use of light: In some therapies, light is used to treat certain conditions. An example is phototherapy, which uses various wavelengths of ultraviolet (UV) or visible light for conditions like newborn jaundice, skin disorders, or seasonal affective disorder.
3. Light anesthesia: A state of reduced consciousness in which the patient remains responsive to verbal commands and physical stimulation. This is different from general anesthesia where the patient is completely unconscious.
4. Pain relief using light: Certain devices like transcutaneous electrical nerve stimulation (TENS) units have a 'light' setting, indicating lower intensity or frequency of electrical impulses used for pain management.
Without more context, it's hard to provide a precise medical definition of 'light'.
Photochemical reduction of carbon dioxide
Photoelectrochemical process
Catalysis
Di-π-methane rearrangement
Photochemical machining
James Franck
Franck-Condon principle
Bullvalene
Norrish reaction
Nonlinear optics
Photo-oxidation of polymers
Johannes Lelieveld
Far-red
Lightfastness
Ozone depletion
Shadow mask
Environmental impact of the petroleum industry
Ultraviolet
Cell disruption
Vinyl alcohol
Richard Lindzen
Fritz Weigert
Vitamin D
Advanced oxidation process
Solar energy
Cage effect
LightJet
Konrad Johannes Karl Büttner
Woodward-Hoffmann rules
Enzacamene
Quantum computing offers new insight into photochemical processes
A Novel Photochemical Machining Process for Magnesium Aerospace and Biomedical Microengineering Applications - PCMI
UV light for photochemical processes
Search
Denzil Browne: Photo Chemical Process • Dnote
Synthesis of polymeric ionic liquids using a photochemical polymerization process | University of Toledo Digital Repository
Quantum computing offers new insight into photochemical processes
Project Record: Oxidant and Particle Photochemical Processes above a South-East Asian tropical rain forest (OP3-1) Project
Precision In The Photochemical Etching Process | Entrepreneur Articles & Resources | Liqsquid
Versatile and nondestructive photochemical process for biomolecule immobilization. - NextBio article
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Photochemical reduction of carbon dioxide - Wikipedia
Plaque Etching & Engraving machines photo etching process etching machine photo chemical etching machine
Seán Ottewell | Chemical Processing
Photovoltaic Energy-Assisted Electrocoagulation of a Synthetic Textile Effluent
Water Research Institute - University of Barcelona
Catalysis - Wikipedia
Novel intermolecular and intramolecular photochemical reactions initiated by excited state single electron transfer processes<...
Bright monomeric photoactivatable red fluorescent protein for two-color super-resolution sptPALM of live cells
Falguera V, Garvin A, Garza S, Pagan J, Ibarz A. 2014. Effect of UV-Vis Photochemical Processing on Pear Juices from Six...
Active repair of a dinuclear photocatalyst for visible-light-driven hydrogen production | Nature Chemistry
Photochemical upconversion of near-infrared light from below the silicon bandgap | Nature Photonics
KAKEN - Research Projects | Photochemical reaction dynamics of hybrid structures composed of metal nanoparticle and organic...
Reston Biogeochemical Processes in Groundwater Laboratory | U.S. Geological Survey
eTD Explore
NIOSHTIC-2 Search Results - Full View
Reactor process using metal oxide ceramic membranes (Patent) | DOE Patents
Thomas Nast | Encyclopedia.com
Photochemical metallization allows the manufacture of touchscreens in a single step
Reactions5
- Quantum computing has provided new insights into a fundamental aspect of photochemical reactions that has previously proven difficult to study. (lifeboat.com)
- In addition to the conventional, long-proven reaction process in stirred tank reactors, chemical reactions are increasingly performed in microreactors, which enables even easier and more efficient implementation of photochemical reaction steps. (heraeus.com)
- The carbon capture and conversion process uses a switchable dual-function material consisting of nanoparticles to perform reactions. (chemicalprocessing.com)
- Dark Intermediate States in Photochemical Cis-Trans Isomerization and Pericyclic Reactions. (mpg.de)
- On the atomic scale level, we can describe these photo-chemical reactions, through a multitude of elementary processes occurring on the ultrafast time scale (from sub femtosecond to picosecond) where the initial energy/light harvesting process is followed by energy conversion and transport processes. (lu.se)
Molecular3
- Balzani, V. Photochemical molecular devices. (nature.com)
- We have examined and revealed the effects of localized surface plasmon resonance of metal nanopaparticels on molecular photochemical processes by conventional and single particle spectroscopies. (nii.ac.jp)
- Including the exploitation of previous results from EU funded projects, the goal of project RECOPHARMA is to design, develop, validate and demonstrate a novel process by sequential integration the potentials offered by Molecular Imprinted Polymers (MIPs), Reagentless Thermosorption (RTS), Nanocomposites Functional Materials, Advanced Oxidation Processes, for an effective treatment aiming the recovery of target recalcitrant CDs and degradation of corresponding transformation products or metabolites, working in a continuous operation mode. (europa.eu)
Oxidant1
- The formations of sulfate and nitrate on dust are studied along with the dust effects on the photochemical oxidant cycle for the long-range-transported particles with a diameter of 0.1-40 μ m. (ametsoc.org)
Photophysical2
- We aim at unravelling a complete picture of photophysical and photochemical processes in these systems. (lu.se)
- Our research covers from synthesis (solution process and colloidal synthesis) and characterization (primarily by photochemical and photophysical measurements) to fabrication of eco-friendly, low-cost, and high-performance light-converting devices (primarily for solar cells and photoelectrochemical cells). (lu.se)
Reaction2
- Catalysts generally react with one or more reactants to form intermediates that subsequently give the final reaction product, in the process of regenerating the catalyst. (wikipedia.org)
- This article reports on a project in which silver decahedra were successfully synthesized with high yield via a photochemical reaction using blue light-emitting diodes (LEDs) as the exciting light source. (ojp.gov)
Carbon2
- Photochemical reduction of carbon dioxide harnesses solar energy to convert CO2 into higher-energy products. (wikipedia.org)
- Part 2 of this blog topic continues the discussion from last month of some important aspects of adsorption on activated carbon in the process industries and both parts are intended to serve as an introduction to the topic. (processengr.com)
Photosynthesis2
- The findings could improve scientists' understanding of light-driven processes such as photosynthesis, smog formation and ozone destruction. (lifeboat.com)
- Examples of photochemical processes including photosynthesis, photography, solar energy conversation and atmospheric photochemistry. (bath.ac.uk)
Sequential2
Chemical7
- Photochemical reduction involves chemical reduction (redox) generated from the photoexcitation of another molecule, called a photosensitizer. (wikipedia.org)
- This Small Chemical Etching Equipment is a chemical photoengraving processing equipments. (etchmachinery.com)
- This double side spray Acid etching machine is a chemical photoengraving processing equipment.This machine can use alkaline or acidic etching solution. (etchmachinery.com)
- Prior to joining Chemical Processing in 2012 he was editor of European Chemical Engineer, European Process Engineer, International Power Engineer, and European Laboratory Scientist , with Setform Limited, London. (chemicalprocessing.com)
- [6] Estimates are that 90% of all commercially produced chemical products involve catalysts at some stage in the process of their manufacture. (wikipedia.org)
- The main classes of industrial and natural photo-chemical processes are finally described. (epfl.ch)
- Light is emitted when excited atoms dispose of their excess energy, through several physical, chemical and biological processes. (lu.se)
Isomerization1
- The photochemical cis-trans isomerization of free stilbene molecules follows a hula-twist pathway. (mpg.de)
Substances1
- Photochemical processes can also be used with a specific purpose, e.g. to decompose pollutants or remove toxic substances. (heraeus.com)
Meshes3
- The Ferric Etching Machine can be configured to do ferric chloride etching, as well as cupric chloride etching,used for photochemical milling filter meshes, seives, screens and grilles. (etchmachinery.com)
- When applied specifically to the manufacture of customized meshes and filters, PCE is characterized by several process advantages. (ctemag.com)
- The versatility of micrometal's PCE process removes the limitations OEMs consistently experience when designing filters and meshes. (ctemag.com)
Ultrafast Processes1
- In: Femtochemistry VII: Fundamental Ultrafast Processes in Chemistry, Physics, and Biology, S. 96 - 104 (Hg. (mpg.de)
Oxidation1
- The results show that mineral dust may influence tropospheric sulfate, nitrate, and O 3 formation by affecting trace gas concentrations and the tropospheric oxidation capacity through surface processes. (ametsoc.org)
Conventional1
- Jochen Kern, head of sales and marketing at micrometal said, "When compared with conventional production processes, PCE has several inherent advantages, key among which are the ability to produce parts without degrading material properties, the fact that there is almost no limit on part complexity, and the ability to process a huge range of metals and alloys. (ctemag.com)
Biological methods1
- Actual methods for the removal and degradation of CDs, including electrochemical, photochemical, and biological methods have been developed. (europa.eu)
Light9
- Photochemical upconversion is a strategy for converting infrared light into more energetic, visible light, with potential applications ranging from biological imaging and drug delivery to photovoltaics and photocatalysis. (nature.com)
- Improving the light-harvesting of amorphous silicon solar cells with photochemical upconversion. (nature.com)
- For the new process, the developers use a process known as photochemical metallization: When a photoactive layer is irradiated by UV light, colorless silver compounds are transformed into electrically conductive metallic silver. (nanowerk.com)
- Iron-Induced Changes in Light Harvesting and Photochemical Energy Conversion Processes in Eukaryotic Marine Algae. (epa.gov)
- Scholars@Duke publication: Drosophila TRPA1 isoforms detect UV light via photochemical production of H2O2. (duke.edu)
- Our results suggest that specific isoforms of dTRPA1 can sense UV light via photochemical production of H2O2. (duke.edu)
- Time resolved information about these processes can be obtained using free electron lasers or attosecond light sources. (lu.se)
- These properties make 2DES the method of choice when exploring the light-triggered processes in complex systems. (lu.se)
- Physical phenomena such as refraction, diffraction and interference are explained by the wave model of light, but when explaining photoelectric, photochemical or photobiological processes, we use the photon model. (lu.se)
Solar energy1
- Schulze, T. F. & Schmidt, T. W. Photochemical upconversion: present status and prospects for its application to solar energy conversion. (nature.com)
Formation1
- Through the scheduled secondments, the involved staff will perform the required R&I to demonstrate the technical and economic feasibility of the developed process, including the technical formation of specialists as a fundamental activity to project success. (europa.eu)
Physics1
- Despite the ever-increasing need to understand these energy conversion and transport processes in many fields of Physics, Chemistry, and Biology, many challenges must be addressed due to the multiscale nature of the problem - from atomic to nanoscopic length and time scale. (lu.se)
Centers2
- In our Applications Competence Centers worldwide, industrial processes can be simulated and materials tested with UV technology. (heraeus.com)
- The advantage of dividing the two processes among different centers is in the ability to tune each center for a particular task, whether through selecting different metals or ligands. (wikipedia.org)
Impacts1
- A detailed gas-phase chemistry mechanism is combined with dust surface uptake processes to explore possible impacts of mineral dust on tropospheric chemistry. (ametsoc.org)
Wastewater1
- Its combination with other processes, like ozonation [ 18 ], has also been demonstrated to be highly effective for complex matrix wastewater remediation. (hindawi.com)
Concentrations1
- Effects of Inorganic Sediment and Food Concentrations on Energetic Processes of the Zebra Mussel, 'Dreissena polymorpha': Implications for Growth in Turbid Rivers. (epa.gov)
Reduction2
- The reduction process begins with excitation of the photosensitizer, as mentioned. (wikipedia.org)
- Common donors in photochemical reduction include triethylamine (TEA), triethanolamine (TEOA), and 1-benzyl-1,4-dihydronicotinamide (BNAH). (wikipedia.org)
Metal4
- Research was carried out to evaluate the feasibility of fabricating perforated (filigree) magnesium microcomponents with metal wire widths of the order of the metal thickness using a photochemical machining (PCM) process. (pcmi.org)
- Experimentally, it has been demonstrated for the first time that metal wire widths of 0.15 mm can be achieved within a 2D, 0.25 mm thick magnesium foil to fabricate microcomponents for use as micro air vehicle (MAV) wings or stents through a bespoke PCM process. (pcmi.org)
- Photochemical etching is a metal processing technology that produces stress-free, flat components by selective etching through a photo-resist mask. (ctemag.com)
- At micrometal, we have a complete focus on the industrial production of high precision, repeatably accurate micro metal components, and to ensure this the company is constantly evolving the PCE process to offer far superior results than legacy PCE processes. (ctemag.com)
Environmentally2
- Environmentally friendly process could lead to the sustainable production of bioactive compounds and advanced biofuels. (chemicalprocessing.com)
- Oliviera added that this process offered several benefits: Since it is fast, flexible, variable in size, inexpensive and environmentally friendly, further process steps for post-treatment became unnecessary. (nanowerk.com)
Enables1
- Researchers from leading institutions collaborate on a dual-active site catalyst comprising copper and tungsten, which enables an efficient and selective conversion process and. (chemicalprocessing.com)
Purification1
- Major uses for this process include purification and feed systems where contaminants are present at high concentration (bulk separations). (processengr.com)
Initially2
- In these processes, a tricoordinate boronic ester initially serves as a protective group for a sugar-derived 1,2- or 1,3-diol motif, permitting functionalization of free OH groups. (acs.org)
- The neural signals initially processed by the retina travel via the axons of the ganglion cells through the optic nerves, dividing and partially crossing over into the optic chiasm and then travelling via the optic tracts to the lateral geniculate nucleus (LGN). (medscape.com)
Methods1
- Describe modern instrumental methods for photochemical investigation. (bath.ac.uk)
Lasers1
- There are three different possibilities we can use depending on the requirements: `Writing conductive paths` using UV lasers is the process which is particularly suitable for the initial customized prototype manufacture and testing the new design of the conductive path. (nanowerk.com)
Precision1
- This double spray precision Plaque Etching & Engraving machines is Photochemical etching processing equipments. (etchmachinery.com)
Manufacture5
- This etching process differs significantly from the industrial etching process used currently to manufacture magnesium letterpress printing plates and embossing dies. (pcmi.org)
- Nanowerk News ) Research scientists at INM - Leibniz Institute for New Materials are presenting a new process that, in a single step, allows manufacture of conductive paths that are just a few micrometers in width on flexible foils. (nanowerk.com)
- The research scientists at INM - Leibniz-Institute for New Materials are now presenting a new process that, in a single step, allows manufacture of conductive paths that are just a few micrometers in width on carrier materials such as glass but also on flexible foils. (nanowerk.com)
- On plastic foil, in particular, manufacture using the roll-to-roll process thus becomes particularly efficient. (nanowerk.com)
- The Eco-Efficiency Analysis compares the life cycles of products or manufacturing processes in a holistic approach from the assessment including raw materials sourcing, product manufacture and use, to disposal or recycling. (basf.com)
Laboratory1
- The Reston Biogeochemical Processes in Groundwater Laboratory (RBPGL) research team conducts long-term investigations on the fate and geochemical effects of organic contaminants in surface and subsurface environments. (usgs.gov)
Growth1
- The photochemical growth process of silver decahedra was monitored by both extinction and scattering spectral evolution. (ojp.gov)
Materials2
- For a `semi-continuous process` they are particularly suitable for applying the conductive paths on glass," the materials expert says. (nanowerk.com)
- Thus, the initial steps for a roll-to-roll process would already have been taken," the Head of Optical Materials group concluded. (nanowerk.com)
Application1
- Our application experts give advice on finding the right solution for your process. (heraeus.com)
Solution1
- It focuses then on photoredox processes in solution and at the surface of solids. (epfl.ch)
Products1
- The graph reveals the Eco-Efficiency of a product or process compared to other products or processes. (basf.com)
Occurs1
- In this process, desorption occurs at a pressure much lower than adsorption. (processengr.com)
Ability1
- Varying bar sizes and open area ratios can be incorporated to control flow rates across the mesh, and something that appeals to design engineers across the industry is that micrometal's PCE process allows for far greater open areas than is possible using alternative processing technologies due to its ability to produce tiny and intricate wire sizes. (ctemag.com)
Filter1
- The speed, cost efficiency, and accuracy of micrometal's PCE process are critical for filter applications. (ctemag.com)
Energy1
- In these processes, the individual photon's interaction with an atom or molecule is described, and the energy of the photon is therefore crucial. (lu.se)
Fields1
- Visual processing and, ultimately, visual fields begin in the retina. (medscape.com)
Analysis1
- BASF's Eco-Efficiency Analysis is based on DIN EN ISO 14040 and 14044 for ecological evaluations. (basf.com)