160,740 research outputs found
Nomada panzeri LEPELETIER 1841
No full textNomada panzeri LEPELETIER, 1841, Panzers Wespenbiene N a c h w e i s: 22. Bez., Obere Lobau, Wolfsboden 2B, Randstruktur, N 48°11,25′, E16°31,0′, 153 m SH, F&B-Q20, 29.III.2019, 1♁, ldcEO.Published as part of Zettel, Herbert, Ockermüller, Esther, Schoder, Sabine & Seyfert, Franz, 2022, Zur Verbreitung der Wildbien en (Hymenoptera, Apidae) in Wien, Österreich, pp. 351-396 in Linzer biologische Beiträge 54 (1) on page 384, DOI: 10.5281/zenodo.750760
A Combined Experimental and Theoretical Study on the Stereodynamics of Monoaza[5]helicenes: Solvent-Induced Increase of the Enantiomerization Barrier in 1-Aza-[5]helicene
No full textHelicenes and heterohelicenes are attractive compounds with great potential in materials sciences to be used in optoelectronics as ligand backbones in enantioselective catalysis and as chiral sensors.[1] Synthetic protocols were developed to obtain helicenes with skeletons consisting of ortho-fused benzene rings or analogue structures incorporating a heteroatom, as in thiophene-, furane-, or pyridine-containing helicenes.[2] In recent years, a repertoire of synthetic strategies was developed to access all monoaza[5]helicenes as well as some diaza[ 5]helicenes.[3] The properties of these materials are related to the stereodynamics of these helical chiral compounds. By exploration of the unexpected broad range of physicochemical properties of aza[n]helicenes it was realized that there is an opportunity to modulate a specific property by controlled design of the position of the N atoms in the helical molecular frame. In this contribution, we show a complete stereodynamic characterization of monoaza[5]-helicenes combining enantioselective dynamic HPLC and DFT calculations. At variance with previous theoretical calculations[4], 1-aza[5]helicene shows a surprisingly high enantiomerization barrier, which is triggered by specific solvent interactions. [5]
References
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[2] a) M. Gingras, Chem. Soc. Rev. 2013, 42, 968–1006; b) M. Gingras, G. F_lix, R. Peresutti, Chem. Soc. Rev. 2013, 42, 1007 –1050; c) Y. Shen, C.-F. Chen, Chem. Rev. 2012, 112, 1463– 1535.
[3] a) C. Bazzini, S. Brovelli, T. Caronna, C. Gambarotti, M. Giannone, P. Macchi, F. Meinardi, A. Mele, W. Panzeri, F. Recupero, A. Sironi, Eur. J. Org. Chem. 2005, 1247 – 1257; b) S. Abbate, C. Bazzini, T. Caronna, F. Fontana, C. Gambarotti, F. Gangemi, G. Longhi, A. Mele, I. Natali Sora, W. Panzeri, Tetrahedron 2006, 62,139 –148; c) T. Caronna, F. Fontana, A. Mele, I. Natali Sora, W. Panzeri, L. Vigan_, Synthesis 2008, 413– 416; d) T. Caronna, S. Gabbiadini, A. Mele, F. Recupero, Helv. Chim. Acta 2002, 85, 1 –8; e) T. Caronna, F. Castiglione, F. Fontana, D. Mendola, I. Natali Sora, Molecules 2012, 17, 463 –479.
[4] S. Abbate, C. Bazzini, T. Caronna, F. Fontana, F. Gangemi, F. Lebon, G. Longhi, A. Mele, I. Natali Sora, Inorg. Chim. Acta 2007, 360, 908 –912.
[5] T. Caronna, A. Mele, A. Famulari, D. Mendola, F. Fontana, M. Juza, M. Kamuf, K. Zawatzky, and O. Trapp, Chem. Eur. J. 2015, 21, 1–7
Thermal and X-ray powder diffraction structural characterization of two benfluorex hydrochloride polymorphs
No full textTwo polymorphic forms of benfluorex hydrochloride, phases land II, were isolated as monophasic polycrystalline samples, and structurally characterized using ab initio X-ray powder diffraction methods and a global optimization strategy (simulated annealing). Form I crystallizes in monoclinic system, space group P2(1)/n, with Z=4, a=21.0719(10)angstrom, b=7.0563(4)angstrom, c=14.8684(7)angstrom, beta=116.998(3)degrees, V=1969.8(2)angstrom(3), while Form II crystallizes in the orthorhombic space group Pbca, with Z=8, a=33.8031(2)angstrom, b=15.1451(8)angstrom, c=7.6138(6)angstrom, V=3897.9(4)angstrom(3). Crystals of Form land Form II of benfluorex hydrochloride are based upon an ionic packing of protonated benfluorex molecules at the most basic site, the N1 atoms, and chloride anions. Form I shows the presence of mu-Cl ions, generating centrosymmetric dimers with a N(2)Cl(2) moiety, while Form II contains antiparallel chains of C-H center dot center dot center dot O hydrogen-bonded molecules running along c axis. DSC and thermodiffractometric measurements showed that heating progressively Form II from ambient temperature to 160 degrees C causes a phase transition to the thermodynamically stable Form I, immediately followed by the sample melting, near 165 degrees C. Recrystallization directly to Form I is observed when the melt is cooled back to ambient temperature, with a significant hysteresis (this event being centered near 130 degrees C)
Localized bias Panzeri-Treves-correction for plug-in estimators.
No full textLocalized bias Panzeri-Treves-correction for plug-in estimators.</p
Ctenichneumon panzeri
No full text<i>Ctenichneumon panzeri</i> (W ESMAEL, 1845) <p>M a t e r i a l e x a m i n e d: Trap 4: 1♀ 20.iv.-5.v.</p> <p>D i s t r i b u t i o n: Transpalaearctic and Oriental, known from Georgia (DJANELIDZE 1967).</p>Published as part of <i>Riedel, Pénigot, Schwarz, Diller, Johansson & Japoshvili, G., 2023, Darwin wasps (Hymenoptera, Ichneumonidae) of the Kintrishi National Park, Sakartvelo (Georgia), with descriptions of six new species, pp. 61-153 in Linzer biologische Beiträge 55 (1)</i> on page 100, DOI: <a href="http://zenodo.org/record/10788481">10.5281/zenodo.10788481</a>
Letter: Fast atom bombardment, electrospray, ionspray and tandem mass spectrometry of 1:1 beta-cyclodextrin. 5-methoxytriptamine hydrocloride host-guest complex: host protonation and fragmentation due to guest deamination
No full textSintesi radicaliche di zuccheri ramificati e di disaccaridi 5 - 5' e 6 - 6' a partire da alogenozuccheri
No full textFast Atom Bombardment Mass Spectrometric and Tandem Mass Spectrometric Study on (-)-Menthol-β-(D)-Glucopyranoside, Neohesperidin Dihydrochalcone and Their Non Covalent Associations of β-Cyclodextrin. Two Examples of Interaction of a Carbohydrate Host with Glycoconjugate Guests
No full textFast Atom Bombardment Mass Spectrometric and Tandem Mass Spectrometric Investigation in Thioglycerol on Protonated Non Covalent Associations of Beta-Cyclodextrin with 2-Acetyl-, 2-Propionyl-1-pyrroline and 5-Acetyl-2,3-dihydro-1,4-thiazine, Roast Smelling Odorants in Food. The Role of Matrix
No full textValidation of the Brief Index of Sexual Functioning for women and men (BISF-W and BISF-M) in an Italian sample
No full textIntroduction: The Brief Index of Sexual Functioning for Women (BISF-W) is an international 4-factors tool assessing qualitative and quantitative aspects of sexual experiences in women, both in clinical and experimental settings. The present research aims at validating an Italian version of the BISF-W, to develop a BISF version for men (BISF-M) to fill the gap in the existing sexual function evaluation tools in Italy and to analyze gender and age groups differences in the BISF factors. Methods: The research included 6,355 women, aged from 18 to 65 (M = 34.94, SD = 10.52) and 2,207 men, aged from 18 to 80 (M = 38.25, SD = 13.67), who completed the BISF-W and BISF-M. The Quality of Marriage Index (QMI) was administrated to both samples for testing divergent validity, while Female Sexual Function Index (FSFI) and the International Index of Erectile Function (IIEF) were administered for testing convergent validity. Correlation analysis, MANOVA between gender and age and Confirmatory Factor Analysis were conducted. Results: The CFAs confirmed that the proposed 4-factor model (Dyadic, Solitaire and Anal Sexuality, and Sexual Difficulties) is suitable both for the BISF-W and the BISF-M, demonstrated strong psychometric properties for assessing sexual functioning in both genders, with dyadic sexuality being the most important factor. MANOVA analysis showed significative differences in the factors’ scores, according to gender and age. Discussion: The BISF-W and the BISF-M are promising tools to address sexual functioning in individuals and couples, both in clinical and non-clinical settings. Gender and age differences are discussed regarding the potential use of BISF in the therapeutic context
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