| 词汇 | porphyrin |
| 释义 | BETA Examples of porphyrinporphyrin isn’t in the Cambridge Dictionary yet. You can help! The oligopyrroles and their metal complexes could have been used by primitive metabolizing systems and later modified into porphyrin-like macrocycles. This correlates well with the optical spectra due to chlorophyll or its related porphyrins. Although this subsurface chlorophyll/porphyrin could not be detected by orbital spectrometers, a spectrometer on a landed mission with a penetrator could identify this. As a final step, it has been investigated using similar models, whether an electron can move from the tyrosine to the porphyrin cation. Red light with a narrower spectrum giving the same activation of accumulated porphyrins may be used. They found that 56 % of haemoglobin was converted to porphyrin indicating that the blood lost mostly originated from the upper gastrointestinal tract. Another promising class of biomarkers is the porphyrins, which form the basic structure for the photosynthetic pigment chlorophyll and heme, a prosthetic group found in several proteins of aerobic organisms. This enzyme participates in porphyrin and chlorophyll metabolism. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The parent porphyrin is porphine, and substituted porphines are called porphyrins. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. When there is no metal ion (or atom) bound to the nitrogens in the center, then the compounds are called "free porphin" or "free porphyrins". From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It covers research in the chemistry, physics, biology and technology of porphyrins, phthalocyanines and related macrocycles. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This is similar to hemoglobin in blood, which consists of an iron containing porphyrin reversibly bonded to a protein shell. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The direct ligands to iron, the porphyrin and the proximal histidine, are obviously also needed in the model. Variations and temperature dependence of the excited state properties of conformationally and electronically perturbed zinc and free base porphyrins. Whereas hemoglobin carries its iron atoms in porphyrin rings (heme groups), the copper atoms of hemocyanin are bound as prosthetic groups coordinated by histidine residues. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Plant pigments include a variety of different kinds of molecules, including porphyrins, carotenoids, and anthocyanins. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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