FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2082354890> ?p ?o ?g. }

• W2082354890 endingPage "1094" @default.
• W2082354890 startingPage "1074" @default.
• W2082354890 abstract "Abstract In this paper, we review the literature and present some new data to examine the occurrence and photophysics of the diverse hypericin‐like chromophores in heterotrichs, the photoresponses of the cells, the various roles of the pigments and the taxa that might be studied to advance our understanding of these pigments. Hypericin‐like chromophores are known chemically and spectrally so far only from the stentorids and Fabrea , the latter now seen to be sister to stentorids in the phylogenetic tree. For three hypericin‐like pigments, the structures are known but these probably do not account for all the colors seen in stentorids. At least eight physiological groups of Stentor exist depending on pigment color and presence/absence of zoochlorellae, and some species can be bleached, leading to many opportunities for comparison of pigment chemistry and cell behavior. Several different responses to light are exhibited among heterotrichs, sometimes by the same cell; in particular, cells with algal symbionts are photophilic in contrast to the well‐studied sciaphilous (shade‐loving) species. Hypericin‐like pigments are involved in some well‐known photophobic reactions but other pigments (rhodopsin and flavins) are also involved in photoresponses in heterotrichs and other protists. The best characterized role of hypericin‐like pigments in heterotrichs is in photoresponses and they have at least twice evolved a role as photoreceptors. However, hypericin and hypericin‐like pigments in diverse organisms more commonly serve as predator defense and the pigments are multifunctional in heterotrichs. A direct role for the pigments in UV protection is possible but evidence is equivocal. New observations are presented on a folliculinid from deep water, including physical characterization of its hypericin‐like pigment and its phylogenetic position based on SSU rRNA sequences. The photophysics of hypericin and hypericin‐like pigments is reviewed. Particular attention is given to how their excited‐state properties are modified by the environment. Dramatic changes in excited‐state behavior are observed as hypericin is moved from the homogeneous environment of organic solvents to the much more structured surroundings provided by the complexes it forms with proteins. Among these complexes, it is useful to consider the differences between environments where hypericin is not found naturally and those where it is, notably, for example, in heterotrichs. It is clear that interaction with a protein modifies the photophysics of hypericin and understanding the molecular basis of this interaction is one of the outstanding problems in elucidating the function of hypericin and hypericin‐like chromophores." @default.
• W2082354890 created "2016-06-24" @default.
• W2082354890 creator A5002116173 @default.
• W2082354890 creator A5012303178 @default.
• W2082354890 creator A5050692328 @default.
• W2082354890 creator A5054490875 @default.
• W2082354890 date "2007-08-06" @default.
• W2082354890 modified "2023-10-15" @default.
• W2082354890 title "Photophysics and Multifunctionality of Hypericin-Like Pigments in Heterotrich Ciliates: A Phylogenetic Perspective" @default.
• W2082354890 cites W123992214 @default.
• W2082354890 cites W1571690917 @default.
• W2082354890 cites W1573644421 @default.
• W2082354890 cites W1783185091 @default.
• W2082354890 cites W181251935 @default.
• W2082354890 cites W1915102573 @default.
• W2082354890 cites W1966171518 @default.
• W2082354890 cites W1966192582 @default.
• W2082354890 cites W1967903310 @default.
• W2082354890 cites W1973703868 @default.
• W2082354890 cites W1973855992 @default.
• W2082354890 cites W1974045807 @default.
• W2082354890 cites W1974533920 @default.
• W2082354890 cites W1976947862 @default.
• W2082354890 cites W1977468235 @default.
• W2082354890 cites W1977702305 @default.
• W2082354890 cites W1977740366 @default.
• W2082354890 cites W1979153448 @default.
• W2082354890 cites W1983704024 @default.
• W2082354890 cites W1985445336 @default.
• W2082354890 cites W1986232263 @default.
• W2082354890 cites W1986426749 @default.
• W2082354890 cites W1986579505 @default.
• W2082354890 cites W1987028320 @default.
• W2082354890 cites W1989208756 @default.
• W2082354890 cites W1989952262 @default.
• W2082354890 cites W1990453428 @default.
• W2082354890 cites W1992695412 @default.
• W2082354890 cites W1992779662 @default.
• W2082354890 cites W1994741283 @default.
• W2082354890 cites W1995675972 @default.
• W2082354890 cites W1996005858 @default.
• W2082354890 cites W1997314815 @default.
• W2082354890 cites W1999366120 @default.
• W2082354890 cites W1999428677 @default.
• W2082354890 cites W1999866183 @default.
• W2082354890 cites W2003991955 @default.
• W2082354890 cites W2007315892 @default.
• W2082354890 cites W2009120949 @default.
• W2082354890 cites W2011050823 @default.
• W2082354890 cites W2011762271 @default.
• W2082354890 cites W2012851108 @default.
• W2082354890 cites W2013320271 @default.
• W2082354890 cites W2016079171 @default.
• W2082354890 cites W2016442918 @default.
• W2082354890 cites W2017737965 @default.
• W2082354890 cites W2020324553 @default.
• W2082354890 cites W2022898194 @default.
• W2082354890 cites W2025212924 @default.
• W2082354890 cites W2025503987 @default.
• W2082354890 cites W2026890952 @default.
• W2082354890 cites W2029526573 @default.
• W2082354890 cites W2033888422 @default.
• W2082354890 cites W2034358050 @default.
• W2082354890 cites W2039128085 @default.
• W2082354890 cites W2039837336 @default.
• W2082354890 cites W2040214992 @default.
• W2082354890 cites W2043577437 @default.
• W2082354890 cites W2044153378 @default.
• W2082354890 cites W2044181884 @default.
• W2082354890 cites W2046145489 @default.
• W2082354890 cites W2052979944 @default.
• W2082354890 cites W2053406406 @default.
• W2082354890 cites W2053437772 @default.
• W2082354890 cites W2053895172 @default.
• W2082354890 cites W2057612578 @default.
• W2082354890 cites W2058585497 @default.
• W2082354890 cites W2059451478 @default.
• W2082354890 cites W2060760744 @default.
• W2082354890 cites W2062215334 @default.
• W2082354890 cites W2063637565 @default.
• W2082354890 cites W2064748348 @default.
• W2082354890 cites W2064770404 @default.
• W2082354890 cites W2066592304 @default.
• W2082354890 cites W2069277487 @default.
• W2082354890 cites W2071290145 @default.
• W2082354890 cites W2071904570 @default.
• W2082354890 cites W2073431353 @default.
• W2082354890 cites W2074310954 @default.
• W2082354890 cites W2074874130 @default.
• W2082354890 cites W2074905000 @default.
• W2082354890 cites W2075972452 @default.
• W2082354890 cites W2078320341 @default.
• W2082354890 cites W2079150384 @default.
• W2082354890 cites W2085251780 @default.
• W2082354890 cites W2085587438 @default.
• W2082354890 cites W2089079131 @default.
• W2082354890 cites W2090049237 @default.
• W2082354890 cites W2090404934 @default.

• next