摘要:
A photocatalyst can be regenerated with increasing efficiency, turnover number and turnover frequency in the presence of air by irradiating the photocatalyst, preferably eosin Y, with a first range of wavelengths of light that excite the photocatalyst to an intermediate, adding an electron donor, preferably triethanolamine, or an electron acceptor, and irradiating the so-treated intermediate with a second range of wavelengths of light, typically of shorter wavelength, that turns the intermediate into the original photocatalyst again.
摘要:
This invention is directed to photoluminescent compounds based on rhodamine dyes with green emission and uses thereof for photoluminescence based devices.
摘要:
Compounds and methods for determining transmembrane potential, monitoring changes in transmembrane potential, and/or drug screening are provided. In one aspect, compounds of the invention have a structure according to the formula: E-M-A-C*, wherein A is a fluorophore, selected from xanthenes, coumarins, cyanines, bimanes, and difuloroboradizaindacenes, charged at physiological pH; M is a molecular wire; and E is a hydrophobic moiety, wherein A and E are capable of being involved in a photo-induced, intramolecular electron transfer that quenches the fluorescence of A in response to a voltage condition. C* is a caging moiety (e.g., a photoremovable protecting group). When in use, exemplary compounds of the invention are membrane-impermeant and oriented within the cell membrane such that the charged moiety localizes at the outer leaflet of the lipid bilayer and the hydrophobic moiety and molecular wire associate with the hydrophobic portion of the lipid bilayer. The rate of electron transfer, fluorescence intensity, and quenching are altered in response to changes in transmembrane potential.
摘要翻译:提供了确定跨膜电位的化合物和方法,监测跨膜电位的变化和/或药物筛选。 一方面,本发明的化合物具有下列结构:E-M-A-C *,其中A是在生理pH下加入的选自呫吨,香豆素,花青,双马来酰亚胺和二氟硼烷二恶烷的荧光团; M是分子线; 并且E是疏水部分,其中A和E能够参与光诱导的分子内电子转移,其响应于电压条件淬灭A的荧光。 C *是笼状部分(例如,可光敏保护基团)。 当使用时,本发明的示例性化合物是膜不渗透的并且在细胞膜内定向,使得带电部分定位在脂质双层的外部小叶上,并且疏水部分和分子线与脂质双层的疏水部分缔合。 响应于跨膜电位的变化,电子转移速率,荧光强度和淬灭速率发生变化。
摘要:
The invention provides fluorogenic compounds and probes that can be used as reagents for measuring, detecting and/or screening superoxide. The fluorogenic compounds of the invention can produce fluorescence colors, such as green, yellow, red, or far-red. The invention further provides fluorogenic compounds for selectively staining superoxide in the mitochondria of living cells. The invention also provides methods that can be used to measure, directly or indirectly, the presence and/or amount of superoxide in chemical samples and biological samples such as cells and tissues in living organisms, and a high-throughput screening methods for detecting or screening superoxide or compounds that can increase or decrease the level of superoxide in chemical and biological samples.
摘要:
The present invention relates to novel compounds comprising one or more hydrophobic domains and a hydrophilic domain comprising PEG moieties, useful for binding cells, as well as uses and compositions related thereto. The compounds are useful for immobilizing and/or stabilizing cells.
摘要:
A compound having the formula (I), for use in treating a disease; a composition comprising said fused quinonic compound of formula (I) and at least one pharmaceutically acceptable carrier; as well as a method of modulating a Janus Kinase-Signal Transduction and Activators of Transcription (JAK-STAT) pathway. The activation of a JAK and/or STAT pathways are associated with several disease states such as immunological and inflammatory diseases, hyperproliferative disorders including cancer, and myeloproliferative diseases.