scholarly journals Polarographic Studies of Basic Triarylmethane Dyes. III. Kinetics, Equilibria, and Polarographic Behaviour of 3-Thiophene Green in Aqueous Solutions.

1968 ◽  
Vol 22 ◽  
pp. 1241-1251 ◽  
Author(s):  
Gösta Bengtsson ◽  
Magnus Aronsson ◽  
S. Liaaen-Jensen ◽  
Ulrich Schwieter ◽  
Jaakko Paasivirta
Keyword(s):  
Aqueous Solutions ◽  
Triarylmethane Dyes ◽  
Polarographic Behaviour

scholarly journals Polarographic Studies of Basic Triarylmethane Dyes. I. Kinetics, Equilibria, and Polarographic Behaviour of Methyl Green in Aqueous Solutions.

1967 ◽  
Vol 21 ◽  
pp. 1138-1152 ◽  
Author(s):  
Gösta Bengtsson ◽  
Peder Kierkegaard ◽  
Johan Santesson ◽  
Pär Holmberg ◽  
G. Eriksson ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Methyl Green ◽  
Triarylmethane Dyes ◽  
Polarographic Behaviour

Polarographic behaviour of petroleum components in aqueous solutions: A study using DPP and convective adsorption accumulation

1986 ◽  
Vol 51 (8) ◽  
pp. 1587-1594 ◽  
Author(s):  
Robert Kalvoda ◽  
Ladislav Novotný
Keyword(s):  
Water Pollution ◽  
Aqueous Solutions ◽  
Differential Pulse ◽  
Diesel Oil ◽  
Polarographic Method ◽  
Base Electrolyte ◽  
Mercury Drop Electrode ◽  
Polarographic Behaviour ◽  
Aqueous Base

Tensametric behaviour of solutions of petroleum and its fractions in aqueous base electrolytes was studied by differential pulse polarographic method (DPP) using a stationary mercury drop electrode with adsorptive accumulation. The results indicate that water pollution with petroleum can be determined by DPP, the sensitivity of the determination depending on the quality of the pollutant and on the composition of the base electrolyte. Well utilizable calibration curves were obtained with Diesel oil at concentrations from 30-50 μl/l to 0.5 mg/l and with Saratov petroleum from 0.1-0.2 mg/l to 3.3 mg/l. Use of adsorptive accumulation led to a marked increase of the sensitivity of the analysis.

scholarly journals Polarographic Studies of Basic Triarylmethane Dyes. VI. The Polarographic Behaviour of Three Pyridine Analogues of Malachite Green.

1969 ◽  
Vol 23 ◽  
pp. 455-466 ◽  
Author(s):  
Gösta Bengtsson ◽  
Vegard Nordal ◽  
Kurt Torssell ◽  
Olav Smidsrød ◽  
Alf A. Lindberg ◽  
...  
Keyword(s):  
Malachite Green ◽  
Triarylmethane Dyes ◽  
Polarographic Behaviour

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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