Heavy metal-nucleotide reactions. IV. Nature of the reaction between mercury(II) and uridine or thymidine. Vibrational spectroscopic studies on binding to N(3), C(4)=O, and C(5) of the uracil base

1975 ◽  
Vol 14 (2) ◽  
pp. 287-291 ◽  
Author(s):  
Samir. Mansy ◽  
R. Stuart. Tobias
Keyword(s):  
Heavy Metal ◽  
Spectroscopic Studies ◽  
Uracil Base

Spectroscopic studies on vitreous and polycrystalline heavy metal gallium–bismuthates

2009 ◽  
Vol 355 (50-51) ◽  
pp. 2451-2455 ◽  
Author(s):  
V. Simon ◽  
O. Ponta ◽  
D. Trandafir ◽  
H. Mocuta
Keyword(s):  
Heavy Metal ◽  
Spectroscopic Studies

Synthetic, structural and PE spectroscopic studies on bis(pentadienyl) compounds of iron, ruthenium and osmium. The role of the heavy metal

1987 ◽  
Vol 326 (2) ◽  
pp. 257-268 ◽  
Author(s):  
Lothar Stahl ◽  
Huairang Ma ◽  
Richard D. Ernst ◽  
Isabella Hyla-Kryspin ◽  
Rolf Gleiter ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Spectroscopic Studies

Complementary Z-Contrast Imaging and Digital Image Processing

1985 ◽  
Vol 43 ◽  
pp. 304-305
Author(s):  
K. N. Colonna ◽  
G. Oliphant
Keyword(s):  
Image Processing ◽  
Heavy Metal ◽  
Digital Image Processing ◽  
Digital Image ◽  
Biological Tissue ◽  
Biological Imaging ◽  
Tissue Preparation ◽  
Contrast Imaging ◽  
Imaging Tool ◽  
Z Contrast

Harmonious use of Z-contrast imaging and digital image processing as an analytical imaging tool was developed and demonstrated in studying the elemental constitution of human and maturing rabbit spermatozoa. Due to its analog origin (Fig. 1), the Z-contrast image offers information unique to the science of biological imaging. Despite the information and distinct advantages it offers, the potential of Z-contrast imaging is extremely limited without the application of techniques of digital image processing. For the first time in biological imaging, this study demonstrates the tremendous potential involved in the complementary use of Z-contrast imaging and digital image processing.Imaging in the Z-contrast mode is powerful for three distinct reasons, the first of which involves tissue preparation. It affords biologists the opportunity to visualize biological tissue without the use of heavy metal fixatives and stains. For years biologists have used heavy metal components to compensate for the limited electron scattering properties of biological tissue.

Recent Progress In High-Resolution Shadowing For Biological Transmission Electron Microscopy

1990 ◽  
Vol 48 (1) ◽  
pp. 510-511 ◽  
Author(s):  
Heinz Gross ◽  
Katarina Krusche ◽  
Peter Tittmann
Keyword(s):  
Heavy Metal ◽  
High Resolution ◽  
Freeze Drying ◽  
Atmospheric Conditions ◽  
Vacuum Equipment ◽  
Transmission Electron ◽  
Gas Atmosphere ◽  
Gas Molecules ◽  
Residual Gas ◽  
Backing Layer

Freeze-drying followed by heavy metal shadowing is a long established and straight forward approach to routinely study the structure of dehydrated macromolecules. Very thin specimens such as isolated membranes or single macromolecules are directly adsorbed on C-coated grids. After rapid freezing the grids are transferred into a suitable vacuum equipment for freeze-drying and heavy metal shadowing.To improve the resolution power of shadowing films we introduced shadowing at very low specimen temperature (−250°C). To routinely do that without the danger of contamination we developed in collaboration with Balzers an UHV (p≤10-9 mbar) machine (BAF500K, Fig.2). It should be mentioned here that at −250°C the specimen surface acts as effective cryopump for practically all impinging residual gas molecules from the residual gas atmosphere.Common high resolution shadowing films (Pt/C, Ta/W) have to be protected from alterations due to air contact by a relatively thick C-backing layer, when transferred via atmospheric conditions into the TEM. Such an additional C-coat contributes disturbingly to the contrast at high resolution.

Heavy Metal Tales

2008 ◽  
Vol 42 (2) ◽  
pp. 24
Author(s):  
WILLIAM G. WILKOFF
Keyword(s):  
Heavy Metal
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