نتایج جستجو برای: 2 ratio

تعداد نتایج: 2879109  

Journal: :Organic & biomolecular chemistry 2008
Benito Alcaide Pedro Almendros Amparo Luna M Rosario Torres

Azetidine-2,3-diones (alpha-oxo-beta-lactams) and bromonitromethane undergo coupling in aqueous media in the presence of catalytic amounts of sodium azide. The stereoselectivity of the process was generally good, proceeding with reasonable anti : syn ratios under substrate control. On this basis, a simple and fast protocol for the synthesis of the potentially bioactive 3-substituted 3-hydroxy-b...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2010
Matthias Krüger Matthias Fuchs

We present a detailed analysis of the fluctuation-dissipation theorem (FDT) close to the glass transition in colloidal suspensions under steady shear using mode coupling approximations. Starting point is the many-particle Smoluchowski equation. Under shear, detailed balance is broken and the response functions in the stationary state are smaller at long times than estimated from the equilibrium...

2014
Bishnu P. Koiry Nikhil K. Singha

Copolymerization is an important synthetic tool to prepare polymers with desirable combination of properties which are difficult to achieve from the different homopolymers concerned. This investigation reports the copolymerization of 2-ethylhexyl acrylate (EHA) and styrene using copper bromide (CuBr) as catalyst in combination with N,N,N',N″,N″- pentamethyldiethylenetriamine (PMDETA) as ligand ...

Journal: :Journal of insect physiology 1974
R G Riley R M Silverstein J C Moser

S-(+)-4-methyl-3-heptanone has been identified as the principal alarm pheromone of Atta texana and Atta cephalotes. Both enantiomers of 4methyl-3-heptanone have been synthesized and their biological activities have been compared on both species of ants. Comparison of the geometric averages of response ratios, at threshold concentration levels on A. texana, showed S(4)-4-methyl-3-heptanone to be...

Journal: :Trends in amplification 2012
Gitte Keidser Harvey Dillon Lyndal Carter Anna O'Brien

NAL-NL1, the first procedure from the National Acoustic Laboratories (NAL) for prescribing nonlinear gain, was a purely theoretically derived formula aimed at maximizing speech intelligibility for any input level of speech while keeping the overall loudness of speech at or below normal loudness. The formula was obtained through an optimization process in which speech intelligibility and loudnes...

Journal: :Molecules 2015
Christiana Nikovia Andreas-Philippos Maroudas Panagiotis Goulis Dionysios Tzimis Patrina Paraskevopoulou Marinos Pitsikalis

Statistical copolymers of norbornene (NBE) with cyclopentene (CP) were prepared by ring-opening metathesis polymerization, employing the 1st-generation Grubbs' catalyst, in the presence or absence of triphenylphosphine, PPh₃. The reactivity ratios were estimated using the Finemann-Ross, inverted Finemann-Ross, and Kelen-Tüdos graphical methods, along with the computer program COPOINT, which eva...

2009
Haribabu Ankati Shashidhar Kumar Akubathini Sukanta Kamila Chandrani Mukherjee Santosh R. D’Mello Edward R. Biehl

A wide variety of titled compounds, several of which have neuro-protecting properties has been prepared in yields ranging between 70 to 90%. The compounds were identified by 1 HNMR, 13 C NMR, 1D and 2D NOE analysis, and HRMS. An investigation of the effect of certain 5-substitutuents on the E to Z ratios in DMSO-d6 was carried out. The 5nitro and 5-acetyl substituents were not isomerized, where...

Journal: :Biotechnology and bioengineering 2005
Hisashi Satoh Yuichi Sasaki Yoshiyuki Nakamura Satoshi Okabe Takuya Suzuki

In order to assess the applicability of using microelectrodes as a tool for inhibition tests, temporal and spatial inhibitory effects of 2-chlorophenol (2-CP) on O(2) respiration and nitrification activities in municipal wastewater biofilms were investigated using microelectrodes for O(2) and NH(4)(+). The time-course microelectrode measurements demonstrated that 2-CP inhibited O(2) respiration...

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