Search results for "EROD"

Scuteparvin, a new neoclerodane diterpenoid from Scutellaria parvula

2004

Abstract The diterpenoid fraction occurring in the acetone extract of the aerial parts of Scutellaria parvula has been investigated. Only one neoclerodane diterpenoid, scuteparvin, was isolated and its structure elucidated as 4α,18-epoxy-6α- trans -cinnamoyloxy- neo clerod-13-en-15,16-olide, a new natural product. Scuteparvin is quite similar to the already known ajugarin V from Ajuga remota , the only difference being the occurrence of a trans -cinnamoyl ester system instead of an acetate on the 6α-OH group. This finding confirms that the genera Scutellaria and Ajuga are closely related taxonomically.

A Reconsideration of the Role of Forward-Market Arbitrage in Keynes’s and Hicks’s Theories of the Term Structure of Interest Rates

2014

International audience; This paper develops the relationship between Hicks’s and Keynes’s writings on the theory of the term structure of interest rates, and shows in detail how Hicks built on and extended Keynes’s account. According to this theory, the level of the long-term interest rate is determined by expectations of future short-term rates. Keynes’s thinking contained several notions – such as the preferred habitat of lenders, the theory of forward markets, and risk-premiums – which Hicks used to give a more complete theory of the term structure of interest rates. Besides implementing these notions in his own theory, Hicks introduced the concepts of the preferred habitat of borrowers,…

Volatile Compounds in Red Wines Processed on an Industrial Scale by Short Pre-fermentative Cold Maceration

2012

Nero d’Avola and Shiraz grapes were subjected to pre-fermentative cold maceration at 4°C for about 24 h in industrial winemaking, in order to evaluate the effects of the pre-treatment on aroma profile. The volatile compounds were identified by gas chromatography-mass spectrometry and grouped into 14 chemical families 4 and 9 months after bottling. Principal components analysis (PCA) plots of the volatile compounds showed clear separation among wines from the Shiraz and Nero d’Avola varieties. For instance, Shiraz wines were characterized along the PC1 axe by esters of organic acids, norisoprenoids and C6 alcohols, while Nero d’Avola wines were characterized by acetates and monoterpenic oxid…

Synthetic studies on neoclerodane diterpenes from Salvia splendens: oxidative modifications of ring A.

2011

Salvinorin A (1), a neoclerodane diterpene from the hallucinogenic mint Salvia divinorum, is the only known naturally occurring non-nitrogenous and specific κ-opioid agonist. Some oxidative modifications of the A ring in the congeners of 1 isolated from Salvia splendens salviarin, splenolide B, splendidin and in the non-natural 8-epi-salviarin gave new derivatives, some of which were tested as agonists at opioid receptors. However, none of these compounds were active. The presence of the C-18, C-19 lactone could be at the origin of the observed lack of binding affinity.

MEASURING FIELD RILL ERODIBILITY BY A SIMPLIFIED METHOD

2016

Many process-oriented erosion prediction models reproduce rill erosion as affected by site-specific parameters, as for example, rill erodibility, and thus, their practical application requires the measurement of these parameters or their estimate. The aim of this paper was establishing a method for indirectly measuring field rill erodibility. A simple mathematical approach based on a known soil detachment equation and accounting for the rill erosion dynamic process is applied. Field measurements carried out for seven natural rainfall events occurring at the plots of the Sparacia experimental station, southern Italy, are used for indirectly measuring the rill erodibility of the investigated …

Activity and kinetics of DNA dependent DNA and RNA polymerases n xeroderma pigmentosum and in normal human skin.

1971

1. DNA dependent DNA polymerase (E.C.2.7.7.7) was prepared from human normal and from Xeroderma pigmentosum skin. 2. DNA polymerase from normal skin has the same Michaelis constant with native and denatured DNA as templateKm= 120 ± 11 µg DNA/ml, with differing maximum reaction velocities. 3. The enzyme from Xeroderma pigmentosum has the same Michaelis constant for denatured DNA as the enzyme from normal skin, but with native DNA as template, theKmvalue is lower (97.2 ± 9.8). The maximum reaction velocities of the Xeroderma pigmentosum enzyme with native resp. denatured DNA as template are the same. 4. DNA dependent RNA polymerases (E.C.2.7.7.6) from normal and Xeroderma pigmentosum skin wer…

An Economic Definition of the City

1998

International audience

Herodianus, Regnum post Marcum, edidit Carlo M. Lucarini

2005

Forme e logiche di reciprocità in Erodoto e Tucidide

Questo studio mira ad analizzare le differenti forme e funzioni che l’etica della reciprocità assume nella cultura greca del V secolo a.C., in particolare in Erodoto e Tucidide. La reciprocità è una componente essenziale delle relazioni umane su cui la cultura greca ha elaborato una riflessione attenta. Questo principio morale costituisce una delle primarie forme di applicazione della giustizia nelle relazioni sociali; il suo ruolo si può indagare nell'ambito dei rapporti interpersonali e parimenti nelle relazioni interstatali. Si tratta di un sistema etico che ha delle radici profonde nel pensiero e nel costume greco, pertanto l'indagine su questo tema offre una chiave d'accesso privilegia…

Transient stability simulation of a fixed speed wind turbine by Matlab/Simulink

2007

This paper describes the dynamic behavior of a typical fixed speed wind turbine connected to the grid; the model is developed in the simulation tool Matlab/Simulink and created as a modular structure. The pitch control system is used for stabilization of the wind turbine at grid faults. In this way, voltage stability of the system with grid-connected wind turbines can be improved by using blade-angle control for a temporary reduction of the wind turbine power during a short-circuit fault in the grid. This paper shows a new variable control for maintaining of voltage stability, when a three-phase fault is applied close to the wind turbine and cleared by disconnecting the affected line. In th…