1,041 research outputs found
Photoinduced Intracellular Controlled Release Drug Delivery in Human Cells by Gold-Capped Mesoporous Silica Nanosphere
No full textMesoporous Silica Nanoparticles for Reducing Hemolytic Activity Towards Mammalian Red Blood Cells
No full textLigand Conformation Dictates Membrane and Endosomal Trafficking of Linear and Cyclic Arginine-Glycine-Aspartate (RGD)-functionalized Mesoporous Silica Nanoparticles.
No full textSurface structure of linear nanopores in amorphous silica: Comparison of properties for different pore generation algorithms
Get PDFWe compare the surface structure of linear nanopores in amorphous silica (a-SiO2) for different versions of “pore drilling” algorithms (where the pores are generated by the removal of atoms from the preformed bulk a-SiO2) and for “cylindrical resist” algorithms (where a-SiO2 is formed around a cylindrical exclusion region). After adding H to non-bridging O, the former often results in a moderate to high density of surface silanol groups, whereas the latter produces a low density. The silanol surface density for pore drilling can be lowered by a final dehydroxylation step, and that for the cylindrical resist approach can be increased by a final hydroxylation step. In this respect, the two classes of algorithms are complementary. We focus on the characterization of the chemical structure of the pore surface, decomposing the total silanol density into components corresponding to isolated and vicinal mono silanols and geminal silanols. The final dehyroxylation and hydroxylation steps can also be tuned to better align some of these populations with the target experimental values.This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Han, Yong, Igor I. Slowing, and James W. Evans. "Surface structure of linear nanopores in amorphous silica: Comparison of properties for different pore generation algorithms." The Journal of Chemical Physics 153, no. 12 (2020): 124708, and may be found at DOI: 10.1063/5.0021317. Posted with permission.</p
Piano works by Igor Stravinsky
No full textIn my work I thought was right at first a brief outline development work of Igor Stravinsky. I also tried to "map out" the emergence of some major piano works by the author. finally, I added a few notes on the piano interpretive art of Igor Stravinsky
Ppm scale Pd catalyst applied in aqueous Sonogashira reaction
Get PDFPd catalyst has been widely used in modern synthesis. However, the soaring palladium price in the past years has limited its use due to the high cost. Lowering down the loading of Pd in Pd-catalyzed reactions may help to solve the problem. Here an example of ppm (part per million) scale Pd used in Sonogashira reaction is presented, using the melamine-based resin as supporter of the Pd atom, with TON up to 20,000 in aqueous phase. This method was proved by 20 entries using different aryl bromides with various terminal alkynes, and good to excellent yields were obtained in most cases.This is a manuscript of an article published as Wang, Zhiying, Liang Sun, Jiahao Tang, Wei Shi, and Igor I. Slowing. "Ppm scale Pd catalyst applied in aqueous Sonogashira reaction." Tetrahedron Letters (2022): 154107.
DOI: 10.1016/j.tetlet.2022.154107.
Copyright 2022 Elsevier Ltd.
Posted with permission
Introduzione a Igor Spanò (a cura di) Il Teatro e la festa. Il tempio, la piazza, la scena
No full textPer tre giorni gli studiosi che sono intervenuti al Convegno hanno riflettuto sul senso e sulle funzioni, sulle pratiche cultuali e rituali, sui luoghi che hanno definito nel corso del tempo i momenti della festa e sulle forme di rappresentazione agonistica (danze, corse, gare, giochi di abilità) o drammatica - di cui erano parte essenziale la musica e il canto - che, spesso intrinsecamente, li accompagnano. L'autore nella sua introduzione esamina le sfumature di significato che racchiude il termine utsava, “festa”, “gioia” in sanscrito.For three days the scholars who spoke at the conference reflected on the meaning and functions, on the cult and ritual practices, on the places that have defined the moments of the celebration over time and on the forms of competitive representation (dances, races, competitions, skill games) or dramatic - of which music and singing were an essential part - which, often intrinsically, accompany them. In his introduction, the author examines the nuances of meaning contained in the term utsava, "feast", "joy" in Sanskrit
Compositions of Igor Stravinsky for Violin
No full textThe topic of my thesis is life and work of Igor Stravinsky with norrow focus on compositions for violin. I give greater emphasis to compositions Concerto in D for Violin and Orchestra and the Italian suite with which I have personal experience. Igor Stravinsky composed most of the compositions in the 1930th in cooperation with the violinist Samuel Duskin. Only a few of them are completely original works. The author often used musical themes from his own previously composed ballets, such as the The Firebird, Petrushka, The Soldier's Tale, Pulcinella, or Fairy's Kiss.
Composer Igor Stravinsky is certainly a controversial figure. Though essentially a pragmatist, he was always directed more by instinct while creating music. I would like to present to not only violinists interesting circumstances of compositions, even though is still little available informations
Pore diameter dependence of catalytic activity: p-nitrobenzaldehyde conversion to an aldol product in amine-functionalized mesoporous silica
Get PDFThe reaction yield for conversion of p-nitrobenzaldehyde (PNB) to an aldol product in amine-functionalized mesoporous silica nanoparticles (MSN) exhibits a 20-fold enhancement for a modest increase in pore diameter, d. This enhanced catalytic activity is shown to reflect a strong increase in the “passing propensity,” , of reactant and product species inside the pores. We find that ≈ 0, corresponding to single-file diffusion, applies for the smallest d which still significantly exceeds the linear dimensions of PNB and the aldol product. However, in this regime of narrow pores, these elongated species must align with each other and with the pore axis in order to pass. Thus, reflects both translational and rotational diffusion. Langevin simulation accounting for these features is used to determine versus d. The results are also augmented by analytic theory for small and large d where simulation is inefficient. The connection with the catalytic activity and yield is achieved by the incorporation of results for into a multi-scale modeling framework. Specifically, we apply a spatially coarse-grained (CG) stochastic model for the overall catalytic reaction-diffusion process in MSN. Pores are treated as linear arrays of cells from the ends of which species adsorb and desorb, and between which species hop and exchange, with the exchange rate reflecting . CG model predictions including yield are assessed by Kinetic Monte Carlo simulation.The following article appeared in García, Andres, Igor I. Slowing, and James W. Evans. "Pore diameter dependence of catalytic activity: p-nitrobenzaldehyde conversion to an aldol product in amine-functionalized mesoporous silica." The Journal of Chemical Physics 149, no. 2 (2018): 024101, and may be found at doi: 10.1063/1.5037618. Posted with permission.</p
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