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排序方式: 共有37条查询结果,搜索用时 15 毫秒
1.
Itamar Willner Mazzi Lion-Dagan Shai Rubin Johann Wonner Franz Effenberger Peter Bäuerle 《Photochemistry and photobiology》1994,59(4):491-496
Abstract α-Chymotrypsin exhibits photoswitchable activities in an organic solvent after covalent modification of the protein backbone with thiophenefulgide active ester (2). The thiophenefulgide-modified α-chymotrypsin exhibits reversible photoisomerizable properties between states (3)-E and (3)-C. The modified α-chymotrypsin, where nine lysine residues are substituted by thiophenefulgide units, retains 60% of the activity of the native enzyme. The activities of thiophenefulgide-modified α-chymotrypsin toward esterification of N -acetyl-L-phenylalanine (4) by ethanol in cyclohexane are controlled by the configuration of the attached photoisomerizable component and by prior bioimprinting of the protein backbone with the reaction substrate (4). The esterification of (4) in cyclohexane using bioimprinted (3)-C is two-fold faster than in the presence of (3)-E. In the presence of a nonbioimprinted enzyme, esterification of (4) by (3)-C is five-fold faster than with (3)-E. The activity of bioimprinted (3)-E toward esterification of (4) is 4.5-fold higher than that of nonbioimprinted (3)-E. Switchable cyclic esterification of (4) is accomplished by sequential photoisomerization of the thiophenefulgide-modified α-chymotrypsin between states (3)-C and (3)-E. 相似文献
2.
Francesca Cal Chiara Roberta Girelli Federica Angil Laura Del Coco Lucia Mazzi Daniele Barbini Francesco Paolo Fanizzi 《Molecules (Basel, Switzerland)》2021,26(8)
Considering the growing number of extra virgin olive oil (EVOO) producers in the world, knowing the influence of olive oils with different geographical origins on the characteristics of the final blend becomes an interesting goal. The present work is focused on commercial organic EVOO blends obtained by mixing multiple oils from different geographical origins. These blends have been studied by 1H-NMR spectroscopy supported by multivariate statistical analysis. Specific characteristics of commercial organic EVOO blends originated by mixing oils from Italy, Tunisia, Portugal, Spain, and Greece were found to be associated with the increasing content of the Italian component. A linear progression of the metabolic profile defined characteristics for the analysed samples—up to a plateau level—was found in relation to the content of the main constituent of the Italian oil, the monocultivar Coratina. The Italian constituent percentage appears to be correlated with the fatty acids (oleic) and the polyphenols (tyrosol, hydroxytyrosol, and derivatives) content as major and minor components respectively. These results, which highlight important economic aspects, also show the utility of 1H-NMR associated with chemometric analysis as a powerful tool in this field. Mixing oils of different national origins, to obtain blends with specific characteristics, could be profitably controlled by this methodology. 相似文献
3.
4.
In this paper we address the problem of characterizing the infinitesimal properties of functions which are nonincreasing along all the trajectories of a differential inclusion. In particular, we extend the condition based on the proximal gradient to the case of semicontinuous functions and Lipschitz continuous differential inclusions. Moreover, we show that the same criterion applies also in the case of Lipschitz continuous functions and continuous differential inclusions. 相似文献
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Transition Metal Chemistry - 相似文献
7.
Ulderico Mazzi Edoardo Roncari Roberto Rossi Valerio Bertolasi Orazio Traverso Luciano Magon 《Transition Metal Chemistry》1980,5(1):289-293
Summary The reactions of ReOX3(PPh3)2 (X = CI or Br) withN-methylsalicylideneimine (Me-saIH),N-phenylsalicylideneimine (Ph-saIH),N,N-ethylenebis(salicyli(leneimine) [(SaIH)2en] and 8-hvdroxyquinoline (Oxinell) are here reported. They give rise to the ReOX2(Me-sal)PPh2. ReOX-(Me-sal)2, ReOX2(Ph-sal)PPh3, ReOX(Ph-sal),, Re2O2X4-(Sal2en)(PPh3)2, ReOX2(Oxine)PPh, and ReOX(Oxine)2 complexes. 相似文献
8.
Edoardo Roncari Ulderico Mazzi Roberto Rossi Adriano Duatti Luciano Magon 《Transition Metal Chemistry》1981,6(3):169-173
Summary Some isomers of the ReOX2LPPh3 complexes [X = Cl or Br and L =N-methylsalicylideneiminate,N-phenylsalicylideneiminate, halfN,N'-ethylenebis(salicylideneiminate) or 8-hydroxyquinolinate] have been synthesized and characterized. Two different mechanisms for reaction of thetrans-ReOX3(PPh3)2 complexes (X = Cl or Br) with the Schiff bases are supported by qualitative studies on such parameters as the Schiff base ligand form, concentration of free triphenylphosphine ligand, reaction solvent and temperature. 相似文献
9.
G. Mazzi 《Chromatographia》1987,24(1):313-316
Summary A rapid, practicable and versatile high-performance liquid chromatographic method is described, which applies to different
therapeutic drug-monitorings. Using the same extraction procedure with 500μl of serum and 250μl of extracting mixture, the
same column and the same mobile phase, the following drugs were separated from endogenous molecules: amitriptyline with nortriptyline,
imipramine with desipramine, chlomipramine, haloperidol, diltiazem, verapamil, amiodarone and desethylamiodarone. 相似文献
10.
E. Vannacci S. Granchi M. Cecchi M. Calzolai E. Mazzi E. Biagi 《Opto-Electronics Review》2018,26(3):201-209
In this study, the temperature influence on the spectral responsivity of a Light Emitting Diode (LED) used as a photoreceptor, combined to light source spectrum is correlated to electrical characteristics in order to propose an alternative method to estimate LED junction temperature, regardless of the absolute illumination intensity and based on the direct correlation between the integral of the product of two optical spectra and the photo-generated currents. A laboratory test bench for experimental optical measurements has been set in order to enable any characterizing of photoelectric devices in terms of spectral behaviour, in a wavelength range placed between 400–1000?nm, and of current-voltage characteristics as function of temperature by using two different illumination sources. The temperature is analysed in a range from 5?°C up to 85?°C, so as to evaluate thermal variation effects on the sensor performance. The photo-generated current of two LEDs with different peak wavelengths has been studied. Research has observed and mathematically analysed what follows: since the photo-generated current strictly depends on the combination between the spectral response of the photoreceptor and the lighting source response, it becomes possible to estimate indirectly the junction temperature of the LEDs by considering the ratio between the photogenerated currents obtained by using two different illumination sources. Such results may for one thing increase knowledge in the fields where LEDs are used as photo-detectors for many applications and for another, they could be extended to generic photodetectors, thus providing useful information in photovoltaic field, for instance. 相似文献