A Practical Method for the Synthesis of Enantiomerically Pure 4-Borono-L-phenylalanine

2000 ◽  
Vol 73 (1) ◽  
pp. 231-235 ◽  
Author(s):  
Hiroyuki Nakamura ◽  
Masaru Fujiwara ◽  
Yoshinori Yamamoto
Keyword(s):  
Practical Method ◽  
Enantiomerically Pure

ChemInform Abstract: A Practical Method for the Synthesis of β-Amino α-Hydroxy Acids. Synthesis of Enantiomerically Pure Hydroxyaspartic Acid and Isoserine.

ChemInform ◽  
2010 ◽  
Vol 31 (5) ◽  
pp. no-no
Author(s):  
Giuliana Cardillo ◽  
Luca Gentilucci ◽  
Alessandra Tolomelli ◽  
Claudia Tomasini
Keyword(s):  
Practical Method ◽  
Hydroxy Acids ◽  
Enantiomerically Pure

ChemInform Abstract: A Practical Method for the Synthesis of Enantiomerically Pure 4-Borono-L-phenylalanine.

ChemInform ◽  
2010 ◽  
Vol 31 (13) ◽  
pp. no-no
Author(s):  
Hiroyuki Nakamura ◽  
Masaru Fujiwara ◽  
Yoshinori Yamamoto
Keyword(s):  
Practical Method ◽  
Enantiomerically Pure

A Practical Method for the Synthesis of β-Amino α-Hydroxy Acids. Synthesis of Enantiomerically Pure Hydroxyaspartic Acid and Isoserine

Synlett ◽  
1999 ◽  
Vol 1999 (11) ◽  
pp. 1727-1730 ◽  
Author(s):  
Giuliana Cardillo ◽  
Luca Gentilucci ◽  
Alessandra Tolomelli ◽  
Claudia Tomasini
Keyword(s):  
Practical Method ◽  
Hydroxy Acids ◽  
Enantiomerically Pure

The role of differential phase contrast in electron microscopy

1978 ◽  
Vol 36 (1) ◽  
pp. 176-177
Author(s):  
E.M. Waddell ◽  
J.N. Chapman ◽  
R.P. Ferrier
Keyword(s):  
Phase Contrast ◽  
Practical Method ◽  
Position Vector ◽  
Differential Phase ◽  
Pure Phase ◽  
Differential Phase Contrast ◽  
The Difference ◽  
Image Position ◽  
First Moment

Dekkers and de Lang (1977) have discussed a practical method of realising differential phase contrast in a STEM. The method involves taking the difference signal from two semi-circular detectors placed symmetrically about the optic axis and subtending the same angle (2α) at the specimen as that of the cone of illumination. Such a system, or an obvious generalisation of it, namely a quadrant detector, has the characteristic of responding to the gradient of the phase of the specimen transmittance. In this paper we shall compare the performance of this type of system with that of a first moment detector (Waddell et al.1977).For a first moment detector the response function R(k) is of the form R(k) = ck where c is a constant, k is a position vector in the detector plane and the vector nature of R(k)indicates that two signals are produced. This type of system would produce an image signal given bywhere the specimen transmittance is given by a (r) exp (iϕ (r), r is a position vector in object space, ro the position of the probe, ⊛ represents a convolution integral and it has been assumed that we have a coherent probe, with a complex disturbance of the form b(r-ro) exp (iζ (r-ro)). Thus the image signal for a pure phase object imaged in a STEM using a first moment detector is b2 ⊛ ▽ø. Note that this puts no restrictions on the magnitude of the variation of the phase function, but does assume an infinite detector.

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