Single-Crystal Matrix Isolation of Biopolymers

1997 ◽  
Vol 119 (43) ◽  
pp. 10565-10566 ◽  
Author(s):  
Jean Chmielewski ◽  
Jerry J. Lewis ◽  
Scott Lovell ◽  
Reena Zutshi ◽  
Phil Savickas ◽  
...  
2021 ◽  
Vol 406 ◽  
pp. 274-284
Author(s):  
Soria Zeroual ◽  
Mohammed Sadok Mahboub ◽  
Ghani Rihia ◽  
Mourad Mimouni ◽  
Ghougali Mebrouk ◽  
...  

ZnS nanocrystals were embedded in a KBr single crystal matrix using the Czochralski growth technique. The X-ray diffraction, FT-IR and optical spectroscopy revealed the incorporation of ZnS nanocrystals. A blue shift of the absorption edge of the obtained samples has been observed, indicating the quantum confinement effect. The optical band-gap is estimated to be about 4.67 eV. Two excitonic peaks appeared at 300.4 nm and 271 nm. The average nanocrystal size was derived from the optical spectra. Annealing led to a shift in the absorption edge towards longer wavelengths and an increasing of the emissions intensity. Raman lines of the nanoparticles are broader and frequency-shifted compared to those of the bulk crystals. These results show that KBr is a good matrix-host of ZnS nanocrystals, and that the elaborated samples can be used for important technological applications.


1984 ◽  
Vol 37 ◽  
Author(s):  
A. F. Marshall ◽  
F. Hellman ◽  
B. Oh

AbstractFilms of Nb3Sn vapor deposited at low rates and high temperatures on (1102) sapphire form an epitaxial <100> single crystal matrix with a domain structure of misoriented regions bounded by low-angle dislocation boundaries. Nucleation of other orientations at the interface result in a highly oriented but polycrystalline film through approximately the first thousand Angstroms of film thickness. After this point random orientations become overgrown by epitaxial <100> regions. At slightly lower temperatures many small <100> grains with a second epitaxial relationship also nucleate at the interface. These rotated grains persist through greater thicknesses than random orientations. The misorientation defect structure of the single crystal matrix is analyzed by transmission electron microscopy.


2000 ◽  
Vol 620 ◽  
Author(s):  
Miki Kurimoto ◽  
Loyd D. Bastin ◽  
Daniel Fredrickson ◽  
Pamela N. Gustafson ◽  
Sei-Hum Jang ◽  
...  

ABSTRACTOriented gases of biopolymers in simple, single crystal hosts might be used to measure anisotropic molecular properties of analytes that could not otherwise be crystallized. Here we show two types of crystals as examples of the single crystal matrix isolation of biopolymers: green fluorescent protein in α-lactose monohydrate as a model system for studying the kinetic stabilization of biopharmaceuticals, and adenosine phosphates in potassium dihydrogen phosphate, a first step in the matrix isolation of oligonucleotides. In each case, the hosts undergo compositional zoning – both intersectoral and intrasectoral – during growth from solution. Intrasectoral zoning is evident by the selective luminescence of adjacent vicinal slopes of growth active hillocks. Nucleotides furthermore distinguish between symmetry related growth sectors enantioselectively.


1980 ◽  
Vol 193 (3) ◽  
pp. 315-320 ◽  
Author(s):  
R. Franzi ◽  
M. Geoffroy ◽  
N. Leray

1983 ◽  
Vol 38 (7) ◽  
pp. 830-834 ◽  

Abstract Single crystals of acetyltetralone grown from a solution containing a small amount of Cu(II) ions are studied by ESR. The corresponding g, 63Cu magnetic and quadrupolar hyperfine tensors are obtained and are consistent with the trapping of a square planar copper(II) complex. X-ray diffraction shows that pure acetyltetralone crystallizes in the orthorhombic space group Pbca (a - 8.893 Å, b = 20.301 Å, c = 10.715 Å). Comparison of the ESR eigenvectors with the bond directions obtained from this crystal structure study shows that the Cu(II) complex experiences some constraint from the crystal matrix. The present complex is a model for one of the complexation sites of tetracyclines.


2013 ◽  
Vol 86 (6) ◽  
Author(s):  
R.P. Borges ◽  
B. Ribeiro ◽  
M.M. Cruz ◽  
M. Godinho ◽  
U. Wahl ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document