New highly fluorescent ketocyanine polarity probes
摘要:
The syntheses and spectral properties of three new and highly fluorescent solvent polarity probes are described. They are found to be extremely sensitive to solvent polarity in that spectral red shifts in both absorption and fluorescence spectra occur upon increasing solvent polarity. Excitation and emission data of the dyes in a set of different polar solvents are given. The emission data are compared with the standard ET(N) values of solvent polarity and a linear correlation is obtained over a wide range. The origin of the unusual solvatochromic properties is discussed in terms of the resonance structures of this new group of molecular probes. Their outstanding features include high spectral sensitivity to polarity, high molar absorptivities, high fluorescence quantum yields, longwave excitation and emission, insignificant quenching by oxygen, and a sufficient stability in aqueous solution. Therefore, the new probes are considered to be advantageous over other polarity probes used so far in probing biochemical and biological systems.
作者:Bernard Garrigues、Aurelio Munoz、Max Koenig、Michel Sanchez、Robert Wolf
DOI:10.1016/0040-4020(77)80303-7
日期:1977.1
New spirophosphoranes have been prepared by reaction of &alpha-aminoacids with tricoordinate phosphorus substrates. In one case, 1i, an equilibrium chain-cycle PIIIPv has been observed.
通过α-氨基酸与三配位磷底物的反应已制备了新的螺正膦。在一种情况1i中,已经观察到平衡链循环P III P v。
MICROORGANISMS WITH ABILITY TO DEGRADE INDOLE AND ENZYMES THEREFROM
申请人:——
公开号:US20030054519A1
公开(公告)日:2003-03-20
There is provided novel indole oxidase activity isolated from
P. putida
, such indole oxidase activity is believed to be useful in the biosynthetic production of indigo from its precursor indole. Also provided are compositions of matter comprising the indole oxidase and methods for producing such.
Novel Microorganisms with ability to degrade indole and novel enzymes therefrom
申请人:——
公开号:US20030059913A1
公开(公告)日:2003-03-27
There is provided novel indole oxidase activity isolated from
P. putida,
such indole oxidase activity is believed to be useful in the biosynthetic production of indigo from its precursor indole. Also provided are compositions of matter comprising the indole oxidase and methods for producing such.
An antifreeze agent comprises a water-soluble alcohol component, such as ethylene glycol, together with the following percentages by weight (all with reference to the alcohol component) of the following substances:
about 0.02 to about 1% alkali metal or ammonium metasilicate (calculated as pentahydrate), such as sodium metasilicate;
about 0.1 to about 5% alkali metal or ammonium salt of an α,β-ethylenically unsaturated carboxylic acid, such as sodium cinnamate;
about 0.5 to about 5% alkali metal or ammonium salt of boric acid, such as borax decahydrate;
0 to about 1% alkali metal or ammonium hydroxide, such as caustic soda;
0 to about 0.15% polycyclic heterocyclic copper corrosion inhibitor, such as benzotriazole;
0 to about 1% alkali metal or ammonium nitrite, such as sodium nitrite; and
0 to about 1 % alkali metal or ammonium nitrate, such as sodium nitrate.