The structure of alectoronic acid and related lichen metabolites

1974 ◽  
Vol 27 (11) ◽  
pp. 2403 ◽  
Author(s):  
JA Elix ◽  
BA Ferguson ◽  
MV Sargent
Keyword(s):  
Spectroscopic Evidence ◽  
Lactone Form ◽  
Lichen Metabolites

Spectroscopic evidence is presented to show that the lichen depsidone alectoronic acid is a tautomeric compound which exists predominantly in a novel, six-membered, pseudo-acid (hydroxy lactone) form. The existence of this pseudo-acid tautomer was confirmed chemically by esterification with acidic methanol, whereupon the corresponding pseudo-ester was produced. P.m.r. spectroscopy indicated that the related depsidone, α-collatolic acid, and the lichen depside, microphyllinic acid, exhibit analogous ring-chain tautomerism.

NADH in Solution: A Single State

2019 ◽  
Author(s):  
Joachim Hönes ◽  
Julia Wack ◽  
Katja Schmitz
Keyword(s):  
Aqueous Solution ◽  
Base Stacking ◽  
Spectroscopic Evidence ◽  
Single State

<div>Spectroscopic evidence is presented to show that NADH in aqueous solution does not exist as a folded/unfolded equilibrium but as a single state. The molecule is folded but without base stacking between dihydronicotinamide and adenine.<br></div>

scholarly journals Dihydroflavonol and Flavonol Derivatives from Macaranga Recurvata

2012 ◽  
Vol 7 (10) ◽  
pp. 1934578X1200701
Author(s):  
Mulyadi Tanjung ◽  
Euis H. Hakim ◽  
Elfahmi ◽  
Jalifah Latip ◽  
Yana M. Syah
Keyword(s):  
Strong Activity ◽  
Spectroscopic Evidence ◽  
New Compounds ◽  
Flavonol Derivatives

Two new dihydroflavonol derivatives, macarecurvatins A and B, have been isolated from the leaves of Macaranga recurvata(Euphorbiaceaae), along with the known compounds diisoprenylaromadendrin, glyasperin A and broussoflavonol F. The structures of the new compounds were determined on the basis of spectroscopic evidence. Upon cytotoxic evaluation against P-388 cells, macarecurvatin B showed strong activity with an IC50 of 0.83 μM.

scholarly journals Mars: Mariner 9 Spectroscopic Evidence for H2O Ice Clouds

Science ◽  
1973 ◽  
Vol 182 (4110) ◽  
pp. 381-383 ◽  
Author(s):  
R. J. Curran ◽  
B. J. Conrath ◽  
R. A. Hanel ◽  
V. G. Kunde ◽  
J. C. Pearl
Keyword(s):  
Ice Clouds ◽  
Spectroscopic Evidence ◽  
Mariner 9

scholarly journals SPECTROSCOPIC EVIDENCE FOR THE EXISTENCE OF CARBOXYCYTOCHROME C

1938 ◽  
Vol 124 (1) ◽  
pp. 25-31
Author(s):  
Aaron M. Altschul ◽  
T.R. Hogness
Keyword(s):  
Spectroscopic Evidence

scholarly journals Novel metal cluster in the iron-molybdenum cofactor of nitrogenase. Spectroscopic evidence

1978 ◽  
Vol 253 (4) ◽  
pp. 1001-1004 ◽  
Author(s):  
J. Rawlings ◽  
V.K. Shah ◽  
J.R. Chisnell ◽  
W.J. Brill ◽  
R. Zimmermann ◽  
...  
Keyword(s):  
Metal Cluster ◽  
Molybdenum Cofactor ◽  
Spectroscopic Evidence ◽  
Iron Molybdenum Cofactor

scholarly journals Structural evidence for a reaction intermediate mimic in the active site of a sulfite dehydrogenase

2020 ◽  
Vol 56 (68) ◽  
pp. 9850-9853
Author(s):  
Ahmed Djeghader ◽  
Melanie Rossotti ◽  
Saleh Abdulkarim ◽  
Frédéric Biaso ◽  
Guillaume Gerbaud ◽  
...  
Keyword(s):  
Active Site ◽  
Spectroscopic Evidence ◽  
Reaction Intermediate

We provide structural and spectroscopic evidence for a molybdenum–phosphate adduct mimicking a proposed reaction intermediate in the active site of a prokaryotic sulfite oxidizing enzyme.

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