Ví dụ về việc sử dụng Singlet oxygen trong Tiếng anh và bản dịch của chúng sang Tiếng việt
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When they come into contact with singlet oxygen, they can be.
The singlet oxygen quantum yield correlated with this observation.
Photosensitiser ZnPcS4 has a singlet oxygen quantum yield of 0.70;
Singlet oxygen can theoretically only interact with proximal molecules and structures within this radius.
The carrier may limit light absorption, reducing singlet oxygen yield.[1].
These species include singlet oxygen(1O2), hydroxyl radicals(•OH) and superoxide(O2-) ions.
Its function is to halt oxidation,especially the toxicity of a free radical known as singlet oxygen.
Long-lived nuclear isomers and singlet oxygen are two examples of this.
And since singlet oxygen is believed to have a narrow radius of action, it may not reach the target cells.
It is possible that(over a 6 μs period) singlet oxygen can diffuse up to approximately 300 nm in vivo.
In nature, singlet oxygen is commonly formed from water during photosynthesis, using the energy of sunlight.
Methylene blue is also a photosensitizer used to create singlet oxygen when exposed to both oxygen and light.
Singlet oxygen is a name given to several higher-energy species of molecular O 2 in which all the electron spins are paired.
Following this period a laser light source(Gemini laser) is applied to the skin to activate ALA within the cells,releasing singlet oxygen species.
Photosensitiser ZnPcS4 has a singlet oxygen quantum yield of 0.70; nearly twice that of most other mPCs(ΦΔ at least 0.40).[1].
The singlet state is believed to be more reactive than the ground state triplet state,in the same way that singlet oxygen is more reactive than the triplet oxygen.[3].
The ability of metallo-NC derivatives(AlNc) to generate singlet oxygen is weaker than the analogous(sulphonated) metallo-PCs(AlPC); reportedly 1.6- 3 orders of magnitude less.[1].
These are free radicals(Type I) generated through electron abstraction or transfer from a substrate molecule andhighly reactive state of oxygen known as singlet oxygen(Type II).
It may also be the most powerful carotenoid against singlet oxygen, a highly reactive oxygen molecule and a primary cause of premature skin aging.
A photosensitizer is a chemical compound that can be promoted to an excited state upon absorption of light and undergo intersystem crossing(ISC)with oxygen to produce singlet oxygen.
They also protectplant tissues by helping to absorb the energy from singlet oxygen, an excited form of the oxygen molecule O2 which is formed during photosynthesis.
Recent breakthroughs include a technique where nanoparticles are injected and then only activated at the tumour site by way of x-ray pulses,which creates singlet oxygen to destroy the cancer cells.
This reaction isaccompanied by the production of free radicals(but not singlet oxygen), probably alkoxyl radicals, which may play a role in the initiation of Hypochlorite-induced Lipid peroxidation.
Diamagnetic metals such as zinc, aluminium and gallium, generate metallo-phthalocyanines(MPC) with high triplet quantum yields(ΦT≥ 0.4) and short lifetimes(ZnPCS4 τT= 490 Fs and AlPcS4 τT= 400 Fs)and high singlet oxygen quantum yields(ΦΔ≥ 0.7).
Lycopene may be the most powerful carotenoid quencher of singlet oxygen, being 100 times more efficient in test tube studies of singlet-oxygen quenching action than vitamin E, which in turn has 125 times the quenching action of glutathione.
Lycopene is extract from the fruit of Tomato Solanum lycopersicum L The main active ingredients of Tomato Extract is Lycopene Lycopene maybe the most powerful carotenoid quencher of singlet oxygen being 100 times more efficient in test tube studies….
Low photobleaching to preventdegradation of the photosensitizer so it can continue producing singlet oxygen Natural fluorescence(Many optical dosimetry techniques, such as fluorescence spectroscopy, depend on fluorescence.)[14].
The higher-energy singlet oxygen state(1Σg, 157kJ mol- 1gt; 3Σg) is very short-lived(1Σg≤ 0.33 milliseconds(methanol), undetectable in H2O/D2O) and rapidly relaxes to the lower-energy excited state(1Δg, 94kJ mol- 1gt; 3Σg).
Water(2:3) extract of Quercus robur leaves also exerted a high potency to scavenge reactive oxygen species(superoxide radical, hydroxyl radical, peroxyl radical,hydrogen peroxide, singlet oxygen and reactive nitrogen species)(21).
Although these systems may increase therapeutic effects, the carrier system may inadvertently decreasethe"observed" singlet oxygen quantum yield(ΦΔ): the singlet oxygen generated by the photosensitiser must diffuse out of the carrier system; and since singlet oxygen is believed to have a narrow radius of action, it may not reach the target cells.