منابع مشابه
Enantioselectivity of some lipases: Control and prediction
Different strategies for the resolution of racemates in lipase catalyzed hydrolyses, esterifications, and transesterifications are presented. The importance of the equilibrium conversion for the optimization of the enantiomeric excess is emphasized. Investigations have been carried out on esters of 1-phenylethanol and 2methylalkanoic acids. Results are presented, which provide general informati...
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Chirality is a critical property of amino acids that form proteins, the building blocks of life, and of DNA, which encodes the genetic traits passed from one generation to the next. Furthermore, chirality can be observed throughout nature in objects ranging from spiral seashells to the human hands. If an object and its mirror image are nonsuperimposable, then they have the property of chirality...
متن کاملHydrogen-bonding directed reversal of enantioselectivity.
The preparation of both enantiomers of a chiral compound is still a vital task in pharmaceutical and bioorganic chemistry.1 Basically, it can be achieved with the use of both enantiomers of a chiral ligand, respectively, in a catalytic asymmetric process. However, the two enantiomers of a chiral ligand are not always easily available from natural chiral sources, such as amino acids, carbohydrat...
متن کاملConstructing Enantioselectivity Using Asymmetric Michael Additions
...................................................................................................1 ACKNOWLEDGEMENTS...................................................................................2 TABLE OF CONTENTS.....................................................................................4 LIST OF COMMON ABBREVIATIONS.................................................................5
متن کاملHuman-competitive evolved antennas
We present a case study showing a human-competitive design of an evolved antenna that was deployed on a NASA spacecraft in 2006. We were fortunate to develop our antennas in parallel with another group using traditional design methodologies. This allowed us to demonstrate that our techniques were human-competitive because our automatically designed antenna could be directly compared to a human-...
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ژورنال
عنوان ژورنال: Nature Chemistry
سال: 2008
ISSN: 1755-4330,1755-4349
DOI: 10.1038/nchem.72