Biological process excited state photochemical processes. Medical search. Frequent questions

Photochemical reactions occur naturally in many biological membranes and are responsible for diverse processes such as photosynthesis and vision/phototaxis. (bvsalud.org)
Light is indisputably at the origin of life on earth, driving all photo-chemical reactions in atmosphere, biological systems, and "man-made" energy related materials. (lu.se)
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)
The class of reversibly photoswitchable FPs (rs-FPs) is of particular interest for understanding the origin of structural motions that are associated with the cis-trans and trans-cis photoisomerization reactions of these biological chromophores. (nature.com)
Successful time-resolved crystallography studies have used the pump-probe approach, and the light-induced X-ray crystallographic difference densities have been assigned to reactions and excited-state processes. (nature.com)
This crucial topic is a mechanism that plays a significant role in numerous chemical reactions and processes. (hellovaia.com)
Further, gain insights into its critical role in influencing chemical processes and reactions: an attribute that elevates its significance in the field of organic chemistry. (hellovaia.com)
The origin of widely used division of photodynamic processes into type I and type II and the relation of these processes to the nature of the primary photochemical reactions of photosensitizers are discussed. (msu.ru)
They were based on the effects of electron and nuclear spins in particular and on magnetic interaction in general, on the rates and yields of chemical and biological reactions. (europa.eu)
1. study of photochemical reactions involving proteins and protein related molecules. (europa.eu)
In this talk several examples of photochemical reactions in zeolites with chiral final products would be provided. (miami.edu)
The main way to improve photosynthetic efficiency is to optimize the light reactions, including increasing light absorption and conversion, accelerating the recovery of non-photochemical quenching, modifying enzymes in the Calvin cycle, introducing carbon concentration mechanisms into C 3 plants, rebuilding the photorespiration pathway, de novo synthesis, and changing stomatal conductance. (encyclopedia.pub)
The process of photosynthesis can be basically divided into two stages: light and dark reactions. (encyclopedia.pub)
The light reactions of photosynthesis are the starting points of the whole photosynthesis process, providing adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide phosphate (NADPH) as the energy sources for the subsequent dark reactions, and part of the ATP and NADPH generated enters the photorespiratory pathway. (encyclopedia.pub)
Bekker, who was not involved in either of the current studies, notes that photochemical processes, in which chemical reactions are driven by different wavelengths of light, can lead to changes in the relative amounts of different forms of sulfur, for instance. (livescience.com)
B) The use of photochemical reagents to carry out site-specific reactions on DNA, in particular those involving photo-induced electron transfer. (tcd.ie)

Photochemical and photophysical processes in biomolecules are intimately involved in a multitude of functional processes, that include vision, photosynthesis, molecular recognition, gene replication, etc., and can be utilized in areas such as photodynamic therapy. (rsc.org)
This lecture will present results of photochemical, photophysical, NMR and EPR studies of organic molecules included within a watersoluble cavitand trivially known as octa acid. (miami.edu)

Photosynthesis is the largest mass- and energy-conversion process on Earth, and it is the material basis for almost all biological activities. (encyclopedia.pub)
Photosynthesis refers to the process in which autotrophs convert light energy from the sun into chemical energy to convert inorganic carbon into complex organic carbon and release oxygen. (encyclopedia.pub)
Carbon assimilation is the carbon-reaction stage of photosynthesis, which is essentially a process of inorganic carbon fixation and conversion to organic carbon. (encyclopedia.pub)
The molecular apparatus behind biological photosynthesis retains its long-term functionality through enzymatic repair. (nature.com)
Plants, algae and a few other organisms rely on a process known as photosynthesis to fuel themselves, as they can harness cellular structures called chloroplasts to convert light into usable energy. (elifesciences.org)
Second, a molecule that serves as an intermediate during photosynthesis is kept in a 'safe' state which prevents it from creating harmful compounds. (elifesciences.org)
The work by Havurinne and Tyystjärvi may also reveal new ways to harness biological processes such as photosynthesis for energy production in other contexts. (elifesciences.org)

Light induced chemical and physical processes in small organic-/inorganic-/bio-molecules have been a subject of experimental and theoretical research for several decades. (rsc.org)
Recent advances in high resolution spatio-temporal techniques have offered detailed understanding of excited state processes in small molecules. (rsc.org)
George Church's statement "Regenesis: How Synthetic Biology Will Reinvent Nature and Ourselves" gives us the promise of moving towards using biological molecules for material applications. (rsc.org)
However, excessive exposure to light in the presence of absorbing molecules produces excited states and other oxidant species that may cause cell aging/death, mutations and innumerable diseases including cancer. (bvsalud.org)
A firm groundwork laid in 1960s by G.M.J. Schmidt and his group for solid-state photochemistry established that molecules do react in this state provided they do not have to move much. (miami.edu)
This talk will illustrate with examples the remarkable changes in the photochemical properties of different molecules on placing them within a water-soluble cavitand trivially known as octa acid. (miami.edu)
The photo-chemical properties of this radiation had enriched the covering layer of the earth with highly reactive molecules which were kept far away from a state of chemical equilibrium. (boloji.com)
Thus solar energy is converted into chemical bond energy and incorporated in the biological system as reduced molecules. (boloji.com)
The process in which pigment molecules produce electrons by capturing solar energy is called photosynthetic electron transport (PET). (encyclopedia.pub)

The structural dynamics that result from femtosecond optical excitation have contributions from vibrational and electronic processes and from reaction dynamics that involve the crossing through a conical intersection. (nature.com)
A coherent-control experiment using a two-colour and two-pulse optical excitation strongly amplifies the X-ray crystallographic difference density, while it fully depletes the photoisomerization process. (nature.com)
b) Strong laser excitation pushes most fluorophores to a dark state, from which single fluorophores may stochastically return to an emissive state (highlighted in yellow), the centroid position identified (illustrated by black crosses), and finally mapped in a single composite super-resolution reconstruction (f). (microscopyu.com)
Slug chloroplasts also rapidly build up a strong proton-motive force upon a dark-to-light transition, which helps them to rapidly switch on photoprotective non-photochemical quenching of excitation energy. (elifesciences.org)

In view of the fact that ions play a major role in many chemical and biological process, designing ion selective molecular sensors is a challenging entity in supramolecular chemistry [1,2]. (researchsquare.com)
A conception stating that molecular oxygen is chemically rather passive and special activation mechanisms are needed to involve it into chemical and biological processes appeared in the scientific literature in the middle of XIX century. (msu.ru)
Balzani, V. Photochemical molecular devices. (nature.com)
Femtosecond pump-probe spectroscopy using ultrafast optical and infrared pulses has become an essential tool to discover and understand complex electronic and structural dynamics in solvated molecular, biological, and material systems. (stanford.edu)

However, we demonstrate that the measured motions are not part of the photoisomerization reaction but instead arise from impulsively driven coherent vibrational processes in the electronic ground state. (nature.com)

Now some gases might be a false positive for biosignatures because they can be created by other chemical processes on a planet like photochemical processes in the atmosphere or geological processes beneath the surface that create a given gas. (universetoday.com)
The authors suggest a complex and interdependent dance between biological and geological processes can explain the gap. (livescience.com)
There are geological processes that consume oxygen, so even when biology is pumping it into the environment it doesn't necessarily rise strongly in the atmosphere right away," Anbar said. (livescience.com)

Because photoisomerization occurs on the timescale of the excited-state (ES) lifetime, ultrafast time resolution is needed for direct structural observations. (nature.com)

In L. Bolis, E. J. M. Helmreich, and H. Passow, editors, Information and Energy Transduction in Biological Membranes , pp. 113-131. (uiuc.edu)

Biological photoisomerization is a representative example of non-adiabatic reaction dynamics that involves substantial nuclear reconfiguration. (nature.com)
The presence of the bicontinuous structures formed by the upconverting fibrous nanoassemblies and the solution phase is utilized to design photochemical reaction systems induced by TTA-UC. (mdpi.com)

Activation of oxygen might occur due to intermediate formation of peroxides, which always appear during slow oxidation processes, no matter what is the nature of the oxidizing compound. (msu.ru)
Thus a oxidation-reduction process resulting into transfer and storage of energy got entrenched in the system. (boloji.com)
Together, these [studies] provide compelling evidence for a shift in the oxidation state of the surface ocean 50 million years before the Great Oxidation Event," said Alan Jay Kaufman, a geochemist at the University of Maryland and lead author of the second new study. (livescience.com)
If the biological interpretation is correct, some process must have kept the oxygen being produced in check for millions of years, up until the Great Oxidation Event. (livescience.com)

2. investigation of structure, i.e. surface accessibility and confinement, and dynamic processes, i.e. intermolecular electron and proton transfer, in native and ill defined partly folded and denatured states of proteins as promising new applications. (europa.eu)

This proved to be a development of far reaching consequence Processes of conversion of simple inorganic compounds to an array of complex organic compounds were established. (boloji.com)

As the removal of a PPG does not require chemical reagents, the photocleavage of a PPG is often referred to as "traceless reagent processes", and is often used in biological model systems and multistep organic syntheses. (wikipedia.org)
Fluoride ion is a necessary trace element in the human body, which has vital role in a broad range of chemical, biological and environmental processes [3-5]. (researchsquare.com)
3. modelling of non-enzymatic Deoxyribonucleic acid (DNA) repair via electron transfer from amino acids to the oxidised purine nucleotides that we recently found as a prototype of fast chemical repair of radiation induced damages of DNA and extending the findings to systems with increased complexity within the frame of proteomic research on peculiarities of recognition and processing of DNA substrate. (europa.eu)
And while we don't know exactly what an alien organism would be, we do know that some chemical and physical processes are universal. (universetoday.com)
INTERNATIONAL PROGRAMME ON CHEMICAL SAFETY ENVIRONMENT HEALTH CRITERIA 23 LASERS AND OPTICAL RADIATION This report contains the collective views of an international group of experts and does not necessarily represent the decisions or the stated policy of the United Nations Environment Programme, the International Labour Organisation, or the World Health Organization. (inchem.org)
According to EPA's National Air Pollutant Emission Trends (EPA 1994a), other sources of sulfur dioxide include emissions from chemical and allied product manufacturing, metal processing, petroleum and related industries, other industrial processes, and on-road vehicles. (cdc.gov)

In the ground state of receptor-fluoride complex, the added fluoride ion made hydrogen bond through N−H … F … H−N. Whereas, the intramolecular hydrogen bonding was through F−H … N in the excited state of receptor-fluoride complex. (researchsquare.com)
Based on the experimental results, researchers have proposed several categories of signalling mechanisms for fluoride chemosensor, such as photo-induced electron transfer (PET), intramolecular charge transfer (ICT), excimer and exciplex formation, metal ligand charge transfer (MLCT), excited-state intramolecular proton transfer etc. [13-16]. (researchsquare.com)
We proposed to utilise CIDNP kinetics in proteins to determine the paramagnetic nuclear relaxation times and use them for site-specific determination of correlation times of intramolecular mobility of residues in different conformational states on the nanosecond time scale. (europa.eu)

The results indicate that the excited-state proton transfer (ESPT) process from N-H group nearby the anthracene moiety. (researchsquare.com)

Electrons released in this process are transferred to carbon dioxide and lead to synthesis of carbohydrates. (boloji.com)

This shop contains to the energy of the business of problem regulation 2D studies via the ppb of Photochemical Metal Organic Deposition( PMOD). (taido-hannover.de)
Next, it goes through hydrothermal carbonization, a thermochemical process that uses heat and pressure to convert biomass and organic waste (such as the sargassum being used) into solid hydrochar. (fit.edu)

Time resolved information about these processes can be obtained using free electron lasers or attosecond light sources. (lu.se)

Interpretation of the mechanism and dynamics of photoexcited state processes is of paramount importance to understanding DNA oxidative damage. (rsc.org)

It becomes a co-evolutionary dance or interplay," said Ariel Anbar, a biogeochemist at Arizona State University and lead author of one of the studies. (livescience.com)

Stochastic Optical Reconstruction Microscopy, STORM , is one of a family of Nobel Prize winning super-resolution Single Molecule Localization Microscopies ( SMLM ) for the visualization of biological systems with an optical resolution measured in the tens of nanometers (nm) in the x, y, and z directions. (microscopyu.com)
The importance of weak interactions in biological systems has been recognized for several decades. (miami.edu)

The dramatic history of mechanistic studies of oxygen photoactivation is reviewed starting from the Bach-Engler peroxidation theory to the hypothesis of moloxide, discovery of singlet oxygen and free radicals and, then, to modern views on the primary photoactivation processes. (msu.ru)
At least, the term active (excited) oxygen was widely used in his papers and in works of his followers. (msu.ru)
porphyrazines to improve same view dreamweaver cs5 for spreading a common oxygen as state in a exceptional assumption, which is to be now. (medmotion.com)
Atmospheric carbon dioxide gets fixed in the biological system as energy-rich carbohydrates As a result carbon dioxide content of the atmosphere in the prebiotic era came down and oxygen content increased to stabilize at the present level. (boloji.com)
Oxygen atom functionalization has played an indispensable role in industrial applications and biological processes. (rsc.org)

Photoinduced inter-protein electron transfer is also responsible for various biological processes. (rsc.org)

Past studies have already looked at calculating required biomass to determine how plausible it is that a biosignature gas is in fact the by-product of living beings and not some other unknown abiotic process. (universetoday.com)

Their physicochemical and photochemical properties were investigated, as well as the efficiency and mechanism of PDT death in a cervical cancer cell line (HeLa). (bvsalud.org)
STORM and other SMLMs are conceptually similar techniques: the photochemical properties of the fluorophore are exploited to induce a weakly emissive or non-emissive "dark" state. (microscopyu.com)

Following the ensuing Auger-Meitner cascade, the second X-ray pulse probes the Fe 1s3p transitions in resultant novel core-excited electronic states. (stanford.edu)

Such processes in DNA are also of interest to both the biological and materials communities as memory devices and structural building blocks. (rsc.org)
However, despite growing biological and clinical significance, little is known about the structural arrangement of this receptor or any of its family members. (uci.edu)

Releases of sulfur dioxide to the environment from large processing facilities are not required to be reported to the Toxics Release Inventory (TRI). (cdc.gov)
The primary anthropogenic source of sulfur dioxide gas is fuel combustion from power generation and industrial processes. (cdc.gov)
With regard to the United States, EPA National Air Pollutant Emission Trends estimate that in 1994 a total of 2 1.1 million tons of sulfur dioxide was emitted into the atmosphere in the United States from point and area sources (EPA 1994a). (cdc.gov)
Since sulfur dioxide is the major substance used for manufacturing sulfuric acid, it is not surprising that a significant source of industrial emissions is acid manufacturing and processing facilities. (cdc.gov)
Data are available at the state-level for sulfur dioxide emissions and rank by major category (EPA 1994a). (cdc.gov)

Electrons located in the outer orbit of such particles got excited by the solar energy and were displaced from their orbitals and were transferred to such catalytic particles, which were able to accept electrons from relatively higher energy level. (boloji.com)

ii) response to light and ii) electron transfer processes in a variety of organisms are subjects of great importance. (rsc.org)

We study matter via its interaction with electromagnetic radiation, with a special emphasis on how light couples to the quantum mechanical states of matter. (lu.se)

Confocal steady-state and lifetime-resolved fluorescence imaging microscopy data showed that the released PSs are free to target their natural intracellular targets, which are mitochondria and lysosomes for CisDiMPyP and TPPS2a, respectively. (bvsalud.org)
Similar SMLM techniques include Photoactivated Localization Microscopy ( PALM) and Ground State Depletion Individual Molecule Return ( GSDIM) , among many others. (microscopyu.com)

with two nitro groups, an incoming photon will be twice as likely to promote the compound into an excited state. (wikipedia.org)
Specifically, Physical Optics Corporation will fabricate and test a solid-state filter tailored to precisely match the spectral characteristics of target compound(s), either gaseous or liquid, in the near-infrared region of the electromagnetic spectrum. (nsf.gov)

6. it was also shown that spin-spin interaction induced polarisation transfer in diamagnetic states and essentially affected field dependences of hyperpolarisation when the condition of strong coupling was fulfilled. (europa.eu)

And so, the study used these universal principals to avoid a trap of "terracentricity" - basing all biological models on life we know of on earth. (universetoday.com)

The transition state (TS) calculations were performed to understand the thermodynamic features and mechanism of host-guest interaction. (researchsquare.com)
The sensing mechanism of ATSC receptor was also investigate to evaluate the effect of aromatic group in sensing process. (researchsquare.com)
5.the detailed mechanism of photooxidation of a number of peptides, such as gly-gly, met-gly, gly-met, by tripled excited 4-carboxybenzophenone (CBP) was established. (europa.eu)

Anbar suggests non-biological processes could play a role. (livescience.com)

The natural bond orbital analyses show the second perturbation energy for donor-acceptor interaction of F - with hydrogen is more than 300 kcal/mol at the excited state of receptor-fluoride complex, which indicates the strong single bond between fluoride and hydrogen atom. (researchsquare.com)
Her research interests include the advanced materials processing of ideal electrode materials for electrochemical energy storage system applications such as supercapacitor, water splitting process, direct methanol fuel cells, and hydrogen generation. (rsc.org)

Additionally, while the rate varies with a number of variables, including choice of solvent and pH, the photodeprotection has been exhibited in both solution and in the solid-state. (wikipedia.org)

Photoinduced charge transfer processes have been implicated in a variety of oxidative processes which ultimately lead to mutations, compromising the biological function of DNA. (rsc.org)

From the dark state, very small populations of (ideally) fluorophore are returned to an emissive state, excited, and detected. (microscopyu.com)

By tracking as markedly reflected data themselves, may shop The Mistress Diaries (Avon careers database semi-group to momentum processes only, evenly adjusting that standard analyses should sort kept also for the celestial i of measurements. (taido-hannover.de)

In the process of energy transfer free energy is released which is available to physiochemical processes. (boloji.com)

and (4) industrial process control. (nsf.gov)

Anatomy4

Organisms10

Diseases1

Chemicals and Drugs46

Analytical, Diagnostic and Therapeutic Techniques and Equipment36

Phenomena and Processes66

Disciplines and Occupations12

Anthropology, Education, Sociology and Social Phenomena1

Technology, Industry, Agriculture1

Information Science17

Health Care5

Reactions16

Photophysical2

Photosynthesis7

Molecules9

Excitation4

Molecular4

Vibrational1

Geological processes3

Ultrafast time1

Membranes1

Reaction2

Oxidation4

Confinement1

Inorganic1

Chemical6

Intramolecular3

Proton transfer1

Synthesis1

Organic2

Time-resolved1

Dynamics1

Interplay1

Systems2

Oxygen5

Protein1

Studies1

Properties2

Transitions1

Structural2

Sulfur5

Solar energy1

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Essentially1

Study1

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Role1

Hydrogen2

Solid-state1

Charge transfer1

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