Dielectric study of aqueous solutions and solid samples of methylcellulose

2007 ◽  
pp. 27-29 ◽  
Author(s):  
P. Pissis ◽  
D. Daoukaki-Diamanti
Keyword(s):  
Aqueous Solutions ◽  
Dielectric Study ◽  
Solid Samples

Dielectric Study of Aqueous Solutions of Alanine and Phenylalanine

2005 ◽  
Vol 52 (1) ◽  
pp. 5-10 ◽  
Author(s):  
H. C. Chaudhari ◽  
Ajay Chaudhari ◽  
S. C. Mehrotra
Keyword(s):  
Aqueous Solutions ◽  
Dielectric Study

Dielectric study of the cooperative order-disorder transition in aqueous solutions of schizophyllan, a triple-helical polysaccharide

Biopolymers ◽  
1995 ◽  
Vol 36 (6) ◽  
pp. 803-810 ◽  
Author(s):  
Akio Teramoto ◽  
Hong Gu ◽  
Yuji Miyazaki ◽  
Michio Sorai ◽  
Satoru Mashimo
Keyword(s):  
Aqueous Solutions ◽  
Dielectric Study ◽  
Disorder Transition

Fluorescence Spectra of Europium (III) Phthalate and Naphthalate and of Samarium (111), Europium (Ill), Terbium (III) and Dysprosium (III) Dipyridyl Complexes

1964 ◽  
Vol 19 (4) ◽  
pp. 434-439 ◽  
Author(s):  
Shyama P. Sinha ◽  
Chr. Klixbüll Jørgensen ◽  
R. Pappalardo
Keyword(s):  
Energy Transfer ◽  
Aqueous Solutions ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Line Emission ◽  
Emission Spectra ◽  
Main Constituent ◽  
Solid Samples ◽  
Methanolic Solution

The line emission spectra were measured at 300 °K and 78 °K in solid samples of europium (III) phthalate and naphthalate and in the α,α'-dipyridyl complexes Sm dip2 Cl3, 2 H2O; Eu dip2 Cl3, 2 H2O; Tb dip2(NO3)3 and Dy dip2(NO3)3, H2O. The gadolinium (III) compound Gd dip2 Cl3, 2 H2O shows a typical VAN UITERT effect of energy transfer from the main constituent to Eu (III) and Tb(III) present in the concentration range 0.01-0.1 mole %. The methanolic solution of Gd(III) does not exhibit such energy transfer, whereas Eu dip2+3 and aqueous solutions, probably of Eu phthal2- and Eu naphthal2-. fluoresce strongly at room temperature. However, the latter solution tends slowly to deposit crystalline salts.

Ultrathin frozen sections of yeast without aldehyde prefixation

1978 ◽  
Vol 36 (2) ◽  
pp. 58-59
Author(s):  
K. J. Böhm ◽  
a. E. Unger
Keyword(s):  
Aqueous Solutions ◽  
Biological Material ◽  
Yeast Cells ◽  
Frozen Sections ◽  
Good Preservation ◽  
Ultrathin Frozen Sections

During the last years it was shown that also by means of cryo-ultra-microtomy a good preservation of substructural details of biological material was possible. However the specimen generally was prefixed in these cases with aldehydes.Preparing ultrathin frozen sections of chemically non-prefixed material commonly was linked up to considerable technical and manual expense and the results were not always satisfying. Furthermore, it seems to be impossible to carry out cytochemical investigations by means of treating sections of unfixed biological material with aqueous solutions.We therefore tried to overcome these difficulties by preparing yeast cells (S. cerevisiae) in the following manner:

Imaging polymers, proteins and dna in aqueous solutions with the atomic force microscope

1989 ◽  
Vol 47 ◽  
pp. 32-33
Author(s):  
S.A.C. Gould ◽  
B. Drake ◽  
C.B. Prater ◽  
A.L. Weisenhorn ◽  
S.M. Lindsay ◽  
...  
Keyword(s):  
Amino Acids ◽  
Dna Sequencing ◽  
Aqueous Solutions ◽  
Atomic Force Microscope ◽  
Piezoelectric Crystal ◽  
Atomic Force ◽  
Structure Of Molecules ◽  
Optical Lever

The atomic force microscope (AFM) is an instrument that can be used to image many samples of interest in biology and medicine. Images of polymerized amino acids, polyalanine and polyphenylalanine demonstrate the potential of the AFM for revealing the structure of molecules. Images of the protein fibrinogen which agree with TEM images demonstrate that the AFM can provide topographical data on larger molecules. Finally, images of DNA suggest the AFM may soon provide an easier and faster technique for DNA sequencing.The AFM consists of a microfabricated SiO2 triangular shaped cantilever with a diamond tip affixed at the elbow to act as a probe. The sample is mounted on a electronically driven piezoelectric crystal. It is then placed in contact with the tip and scanned. The topography of the surface causes minute deflections in the 100 μm long cantilever which are detected using an optical lever.

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