113,689 research outputs found
Recettore dell’ossitocina e regolazione della proliferazione cellulare: ruolo della localizzazione in microdomini di membrana
No full textnul
Esercizi di FIsica I
No full textV ia Pinturicchio, 21 20133
214 esercizi e problemi svolti su: 1. Misure e unità di misura; 2. Vettori; 3. Forze; 4. Cinematica; 5. Dinamica di una particella; 6. Lavoro ed energia; 7. Dinamica di un sistema di particelle; 8. Dinamica del corpo rigido; 9. Moti oscillator
Level 1 Muon Trigger Simulation in the Barrel Region
No full textLevel 1 Muon Trigger Simulation in the Barrel Regio
Modulation of anthracycline resistance by the nitroxide TEMPOL in human carcinoma cells.
No full textauthor-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
Frequency combs in III-V/SiN integrated hybrid lasers with narrowband mirror
No full textWe address the dynamics of a III-V/SiN external cavity hybrid laser with a frequency-selective mirror. Simulations through a set of time-delayed algebraic equations accounting for the narrowband SiN mirror reflectivity demonstrate that CW instability occurs when relaxation oscillations become resonant with the beating between longitudinal modes. In the CW unstable regime, we observe the emergence of frequency combs due to four wave mixing, characterized by a modulation of amplitude and frequency. We then characterize the resulting combs in terms of achievable bandwidth. These results are also confirmed through a more accurate time-domain traveling wave model
Synergistic antiproliferative effects of the piperidine nitroxide Tempol and Temozolomide against human glioma cell lines.
No full textAbstract n. 45
ZedPhos Ru(II)/Diamine complexes in asymmetric reduction of carbonyl groups.
No full textThe asymmetric catalysis by transition metal complexes is recognized an alternative strategy for the preparation of compounds which were believed to be impossible to carry out by conventional methods. The greater part of the transition metals known as excellent catalysts for asymmetric synthesis have optically active diphosphine as source of chiality but in spite of the great variety of chiral ligands available, there is still demand for the development of catalysts which display the requirements of high enantioselectivity, diastereoselectivity and productivity in fine chemicals, fragrances, flavours, agrochemicals1.
We have recently prepared two ligands derived from chiral olefins in Z-geometry2, nicknamed ZedPhos by ourselves(a (R,R)-ZedPhos and b(R,R)-Xilyl ZedPhos).
We have investigated the stereodifferentiating ability of these ligands in Hydrogen Transfer (HT) and Asymmetric Hydrogenation (AH) of carbonyl compounds in the presence of achiral diamine (ampy), and chiral (R,R) or (S,S)-1,2-diphenyletylen diamine (DPEN). By comparison we have prepared the hydrogenated analogous3, (2R,5R) -2,5-bis(diphenylphosphino)hexane c, to investigate the possible fate of the the double bound on the ligand. e.e.% up to 82% was obtained in the reduction of acetophenone.
[1] H.U. Blaser, Asymmetric catalysis on industrial scale, E. SHMIDT Eds., 2004.
[2] Cesarotti, Edoardo; Rimoldi, Isabella; Spalluto, Paola; Demartin, Francesco. Chiral 1,4-bis-diphosphine ligands from optically active (Z)-olefins. Tetrahedron: Asymmetry 2007, 18(11), 1278-1283.
[3] Yan, Yuan-Yong; RajanBabu, T. V. Ligand substituent effects on asymmetric induction. Effect of structural variations of the DIOP ligand on the Rh-catalyzed asymmetric hydrogenation of enamides. Organic Letters 2000, 2(26), 4137-4140
Self-Generation of Optical Frequency Combs in III-V/SiN External Cavity Laser with Frequency-Selective Mirror
No full textIn recent years, laser sources based on hybrid integration have been attracting surging interest for their compatibility with silicon photonic (SiPh) platforms making them the key components for many applications in optical communication and sensing. Furthermore, this technology is appealing for the realization of optical frequency combs (OFC) [1] at chip scale [2]. In this contribution, we address the dynamics of III-V/SiN hybrid lasers with high-Q SiN rings (Fig. 1a), providing a narrowband effective reflectivity (/reff/2 in Fig. 1c). Our model makes use of time-delayed algebraic equations accounting for mirror frequency selectivity [4]
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