A Simple Gas Anticontamination Technique for Electron Transmission Microscopy

1969 ◽  
Vol 40 (12) ◽  
pp. 1647-1649 ◽  
Author(s):  
J. S. Bryner ◽  
J. J. Kelsch ◽  
A. G. Holtz
Keyword(s):  
Transmission Microscopy ◽  
Electron Transmission ◽  
Electron Transmission Microscopy

Ultrastructure of Melanin Formation in Curvularia sp., Alternaria sp., and Drechslera Sorokiniana

1977 ◽  
Vol 35 ◽  
pp. 398-399
Author(s):  
M. H. Wheeler ◽  
W. J. Tolmsoff ◽  
A. A. Bell
Keyword(s):  
Potassium Phosphate ◽  
Thielaviopsis Basicola ◽  
Wild Type ◽  
Potassium Phosphate Buffer ◽  
Transmission Microscopy ◽  
Electron Transmission ◽  
Melanin Formation ◽  
Before And After ◽  
Alternaria Sp ◽  
Electron Transmission Microscopy

(+)-Scytalone [3,4-dihydro-3,6,8-trihydroxy-l-(2Hj-naphthalenone] and 1,8-di- hydroxynaphthalene (DHN) have been proposed as intermediates of melanin synthesis in the fungi Verticillium dahliae (1, 2, 3, 4) and Thielaviopsis basicola (4, 5). Scytalone is enzymatically dehydrated by V. dahliae to 1,3,8-trihydroxynaphthalene which is then reduced to (-)-vermelone [(-)-3,4- dihydro-3,8-dihydroxy-1(2H)-naphthalenone]. Vermelone is subsequently dehydrated to DHN which is enzymatically polymerized to melanin.Melanin formation in Curvularia sp., Alternaria sp., and Drechslera soro- kiniana was examined by light and electron-transmission microscopy. Wild-type isolates of each fungus were compared with albino mutants before and after treatment with 1 mM scytalone or 0.1 mM DHN in 50 mM potassium phosphate buffer, pH 7.0. Both chemicals were converted to dark pigments in the walls of hyphae and conidia of the albino mutants. The darkened cells were similar in appearance to corresponding cells of the wild types under the light microscope.

Ultrastructure of Melanin Formation in Thielaviopsis Basicola

1976 ◽  
Vol 34 ◽  
pp. 50-51
Author(s):  
M. H. Wheeler ◽  
W. J. Tolmsoff ◽  
A. A. Bell ◽  
R. D. Stipanovic
Keyword(s):  
Agar Medium ◽  
Thielaviopsis Basicola ◽  
Wild Type ◽  
Transmission Microscopy ◽  
Electron Transmission ◽  
Type Isolate ◽  
Melanin Formation ◽  
Albino Mutant ◽  
Before And After ◽  
Electron Transmission Microscopy

Melanin formation in the fungus Thielaviopsis basicola was examined by light and electron-transmission microscopy with methods described previously in studies of Verticillium dahliae (1,2). A wild-type isolate and an albino mutant of T. basicola were grown on potato-carrot-dextrose-agar medium at 24°C prior to chemical treatment. The wild-type isolate was examined and compared with the albino mutant before and after treatment with each of the following compounds that have been proposed as melanin intermediates in various fungi (3): (+)-scytalone [3,4-dihydro-3,6,8-trihydroxy-l-(2H)- naphthalenone]; 1,8-dihydroxynaphthalene (DHN); L-3,4-dihydroxyphenylalanine (DOPA); and catechol.

Engineering ZnO/GaN Interfaces for Tunneling Ohmic Contacts to GaN

2002 ◽  
Vol 747 ◽  
Author(s):  
E. Kaminska ◽  
A. Piotrowska ◽  
K. Golaszewska ◽  
R. Kruszka ◽  
A. Kuchuk ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Thermal Oxidation ◽  
Ohmic Contacts ◽  
Sputter Deposition ◽  
Zno Films ◽  
Transmission Microscopy ◽  
X Ray ◽  
Electron Transmission ◽  
Electron Transmission Microscopy

ABSTRACTWe have investigated two approaches for the fabrication of thin ZnO films: sputter deposition from the ZnO target and thermal oxidation of vacuum deposited Zn. The microstructure and electronic properties after consecutive steps of the formation of n-ZnO/p-GaN contacts have been studied using electron transmission microscopy and x-ray photoelectron spectrometry. We have achieved ohmic contacts by Zn oxidation and explain their ohmic behaviour in terms of a tunnel n+-ZnO - p-GaN junction.

Electron Transmission Microscopy of NiAl

1967 ◽  
Vol 20 (2) ◽  
pp. 443-450 ◽  
Author(s):  
E. P. Lautenschlager ◽  
T. C. Tisone ◽  
J. O. Brittain
Keyword(s):  
Transmission Microscopy ◽  
Electron Transmission ◽  
Electron Transmission Microscopy
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