What's the difference between chromophore and uroerythrin?
Chromophore
Definition:
(n.) Any chemical group or residue (as NO2; N2; or O2) which imparts some decided color to the compound of which it is an ingredient.
Example Sentences:
(1) F(420) is photolabile aerobically in neutral and basic solutions, whereas the acid-stable chromophore is not photolabile under these conditions.
(2) Theoretical computations are performed of the intercalative binding of the neocarzinostatin chromophore (NCS) with the double-stranded oligonucleotides d(CGCG)2, d(GCGC)2, d(TATA)2 and d(ATAT)2.
(3) The drug-picrate chromophores maximally absorb within the first minute of reaction (21 s for phenacemide, 45 s for cephalothin), after which the absorbances decrease.
(4) The chromophore of octopus rhodopsin is 11-cis retinal, linked via a protonated Schiff base to the protein backbone.
(5) These results suggest that the chromophore-protein interaction is significantly altered during the phototransformation of phytochrome.
(6) Their absorption spectra are at sufficiently long wavelength to be unobscured by cellular chromophores such as nucleotides and aromatic amin acids.
(7) Synthesis products have been identified, and three chromophores have been displayed by their n----II and II----II dichroic transitions.
(8) These surplus chromophores become esterified and are temporarily taken up by the pigment epithelium to be re-entered into the visual cycle as fast as they can be processed by the regenerative machinery of the rod outer segments.
(9) Utilizing the known atomic coordinates of the chromophores (Schirmer, T., Bode, W. and Huber, R. (1987) J. Mol.
(10) In spite of this relatively high value and unusual stability, a persulfide group, R-S-SH, seems to be the most likely structure for this chromophore.
(11) The chromophore was found in the 105,000xg supernatant and gave a reduced CO-difference spectrum with an absorption maximum of 448 nm.
(12) The only other fluorescent chromophore in that region of the spectrum has excitation and emission peaks at 328 and 460 nm, respectively.
(13) When the monomer was further dissociated into constituent subunits in strong alkali or at high concentrations of SDS, the CD spectrum disappeared almost completely, indicating loss of the asymmetric interactions of the chromophoric heme a with its immediate environments, consisting of the subunit assembly.
(14) Using these techniques we have also determined a conditional reduction potential of -0.156 V for the chromophore producing fatty acyl-CoA substrate beta-2-furylpropionyl-CoA.
(15) This effect is attributed to intercalation of the ellipticine chromophore.
(16) The bathochromic shift may be a consequence of a reduced exposure of the chromophore to the aqueous solvent.
(17) In exogenous photosensitization, the chemical agent (chromophore) is most often identified, reaching the skin either via topical contact or by systemic administration (drugs).
(18) Circular dichroism of these compounds allows us to assign the transition due to the amide chromophore.
(19) Fourier-transform infrared difference spectroscopy has been used to detect the vibrational modes in the chromophore and protein that change in position or intensity between rhodopsin and the photoproducts formed at low temperature (70 K), bathorhodopsin and isorhodopsin.
(20) The second chromophore exhibits spectral properties (lambda max = 360, 255 nm, pH 2) similar to that observed for 7,8-dihydropterin cations.
Uroerythrin
Definition:
(n.) A reddish urinary pigment, considered as the substance which gives to the urine of rheumatism its characteristic color. It also causes the red color often seen in deposits of urates.
Example Sentences:
(1) For optimal purification uroerythrin was converted into the trimethyl derivative and chromatographed on silical gel thin-layer plates.
(2) The pigments were eluted with methanol and uroerythrin was further purified by extraction with ether at pH 4.0, repeated chromatography on lipophilic Sephadex LH-20 and thin-layer chromatography on silica gel.
(3) The red pigment uroerythrin, a chromophore known to be adsorbed by the amorphous urate sediments (sedimentum lateritium), has been isolated from human urine and further purified as its trimethyl derivative.
(4) From these results and from infrared, mass spectral and nuclear magnetic resonance data a tripyrrole structure for uroerythrin is concluded.
(5) Urine was applied to a column of Amberlite XAD-2 resin on which uroerythrin and other pigments were adsorbed.