Optically Active Cyclic Oligomers Based on Planar Chiral [2.2]Paracyclophane

Analysis methods developed specifically to determine the presence of ink and other optically active components in paper machine white waters or other process effluents are not available. It is generally more interest¬ing to quantify the effect of circulation water contaminants on end products. This study compares optical techniques to quantify the dirt in process water by two methods for test media preparation and measurement: direct process water filtration on a membrane foil and low-grammage sheet formation. The results show that ink content values obtained from various analyses cannot be directly compared because of fundamental issues involving test media preparation and the varied methodologies used to formulate the results, which may be based on different sets of assumptions. The use of brightness, luminosity, and reflectance and the role of scattering measurements as a part of ink content analysis are discussed, along with fine materials retention and measurement media selection. The study concludes with practical tips for case-dependent measurement methodology selection.

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Microscopic Structure of Er-Related Optically Active Centers in Si

MRS Proceedings ◽

10.1557/proc-770-i7.1 ◽

2003 ◽

Vol 770 ◽

Author(s):

H. Przybylinska ◽

N. Q. Vinh ◽

B.A. Andreev ◽

Z. F. Krasil'nik ◽

T. Gregorkiewicz

Keyword(s):

Ground State ◽

Photoluminescence Spectrum ◽

Zeeman Effect ◽

Optically Active ◽

Single Type ◽

Active Centers ◽

Mbe Growth ◽

Spectral Components ◽

Er Doped ◽

Successful Observation

AbstractA successful observation and analysis of the Zeeman effect on the near 1.54 μm photoluminescence spectrum in Er-doped crystalline MBE-grown silicon are reported. A clearly resolved splitting of 5 major spectral components was observed in magnetic fields up to 5.5 T. Based on the analysis of the data the symmetry of the dominant optically active center was conclusively established as orthorhombic I (C2v), with g‼≈18.4 and g⊥≈0 in the ground state. The fact that g⊥≈0 explains why EPR detection of Er-related optically active centers in silicon may be difficult. Preferential generation of a single type of an optically active Er-related center in MBE growth confirmed in this study is essential for photonic applications of Si:Er.

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Optically Active Gold-Based Composite Particles For Sensing And Catalytic Applications

10.30707/etd2020.lartey.j ◽

2020 ◽

Author(s):

Jemima Asi Lartey

Keyword(s):

Optically Active ◽

Composite Particles ◽

Catalytic Applications

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Chalk-Ex: Transport of Optically Active Particles from the Surface Mixed Layer

10.21236/ada444169 ◽

2005 ◽

Author(s):

Albert J. Plueddemann

Keyword(s):

Mixed Layer ◽

Optically Active ◽

Surface Mixed Layer ◽

Active Particles

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The Catalytic Enantioselective Synthesis of Optically Active Epoxides and Tetrahydrofurans.Asymmetric Epoxidation, the Desymmetrization of meso-Tetrahydrofurans, and Enantiospecific Ring-Enlargement

Current Organic Chemistry ◽

10.2174/1385272013375364 ◽

2001 ◽

Vol 5 (6) ◽

pp. 663-678 ◽

Cited By ~ 45

Author(s):

Tsutomu Katsuki

Keyword(s):

Optically Active ◽

Enantioselective Synthesis ◽

Ring Enlargement

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Lanoconazole and Its Related Optically Active Compound NND-502: Novel Antifungal Imidazoles with a Ketene Dithioacetal Structure

Current Medicinal Chemistry - Anti-Infective Agents ◽

10.2174/1568012033483097 ◽

2003 ◽

Vol 2 (2) ◽

pp. 147-160 ◽

Cited By ~ 10

Author(s):

Yoshimi Niwano ◽

Tetsuto Ohmi ◽

Akira Seo ◽

Hiroki Kodama ◽

Hiroyasu Koga ◽

...

Keyword(s):

Active Compound ◽

Optically Active ◽

Ketene Dithioacetal

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Biological Production of (S)-acetoin: A State-of-the-Art Review

Current Topics in Medicinal Chemistry ◽

10.2174/1568026619666191018111424 ◽

2019 ◽

Vol 19 (25) ◽

pp. 2348-2356 ◽

Cited By ~ 2

Author(s):

Neng-Zhong Xie ◽

Jian-Xiu Li ◽

Ri-Bo Huang

Keyword(s):

Side Effects ◽

Chemical Synthesis ◽

State Of The Art ◽

Optically Active ◽

Considerable Progress ◽

Future Prospects ◽

Chiral Compound ◽

Biological Production ◽

Acetoin Production ◽

Made In

Acetoin is an important four-carbon compound that has many applications in foods, chemical synthesis, cosmetics, cigarettes, soaps, and detergents. Its stereoisomer (S)-acetoin, a high-value chiral compound, can also be used to synthesize optically active drugs, which could enhance targeting properties and reduce side effects. Recently, considerable progress has been made in the development of biotechnological routes for (S)-acetoin production. In this review, various strategies for biological (S)- acetoin production are summarized, and their constraints and possible solutions are described. Furthermore, future prospects of biological production of (S)-acetoin are discussed.

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