scholarly journals Ecology of Testate Amoebae from Mires in the Central Rhodope Mountains, Greece and Development of a Transfer Function for Palaeohydrological Reconstruction

Protist ◽  
2007 ◽  
Vol 158 (2) ◽  
pp. 159-171 ◽  
Author(s):  
R PAYNE ◽  
E MITCHELL
Keyword(s):  
Transfer Function ◽  
Testate Amoebae

Testate amoebae ecology and a local transfer function from a peatland in western Poland

Wetlands ◽  
2008 ◽  
Vol 28 (1) ◽  
pp. 164-175 ◽  
Author(s):  
Łukasz Lamentowicz ◽  
Mariusz Lamentowicz ◽  
Maciej Gąbka
Keyword(s):  
Transfer Function ◽  
Testate Amoebae ◽  
Local Transfer

A testate amoebae transfer function from Sphagnum-dominated peatlands in the Lesser Khingan Mountains, NE China

2015 ◽  
Vol 54 (2-3) ◽  
pp. 189-203 ◽  
Author(s):  
Hongkai Li ◽  
Shengzhong Wang ◽  
Hongyan Zhao ◽  
Ming Wang
Keyword(s):  
Transfer Function ◽  
Testate Amoebae ◽  
Ne China

Ecology of testate amoebae in peatlands of central China and development of a transfer function for paleohydrological reconstruction

2013 ◽  
Vol 50 (3) ◽  
pp. 319-330 ◽  
Author(s):  
Yangmin Qin ◽  
Edward A. D. Mitchell ◽  
Mariusz Lamentowicz ◽  
Richard J. Payne ◽  
Enrique Lara ◽  
...  
Keyword(s):  
Transfer Function ◽  
Testate Amoebae ◽  
Central China

scholarly journals Ecology of testate amoebae (Protista) in south-central Alaska peatlands: building transfer-function models for palaeoenvironmental studies

The Holocene ◽  
2006 ◽  
Vol 16 (3) ◽  
pp. 403-414 ◽  
Author(s):  
Richard J. Payne ◽  
Keiko Kishaba ◽  
Jeff J. Blackford ◽  
Edward A.D. Mitchell
Keyword(s):  
Transfer Function ◽  
Testate Amoebae ◽  
South Central ◽  
Function Models ◽  
Transfer Function Models

scholarly journals Ecology of Testate Amoebae in an Amazonian Peatland and Development of a Transfer Function for Palaeohydrological Reconstruction

2014 ◽  
Vol 68 (2) ◽  
pp. 284-298 ◽  
Author(s):  
Graeme T. Swindles ◽  
Monika Reczuga ◽  
Mariusz Lamentowicz ◽  
Cassandra L. Raby ◽  
T. Edward Turner ◽  
...  
Keyword(s):  
Transfer Function ◽  
Testate Amoebae

Radiation Damage of Support Films

1981 ◽  
Vol 39 ◽  
pp. 28-29
Author(s):  
H.A. Cohen ◽  
W. Chiu
Keyword(s):  
Transfer Function ◽  
Low Temperatures ◽  
Carbon Support ◽  
Contrast Transfer Function ◽  
Electron Dose ◽  
Imaging Parameters ◽  
Negative Stain ◽  
Phase Corrections ◽  
Two Parameters ◽  
Medium Dose

The goal of imaging the finest detail possible in biological specimens leads to contradictory requirements for the choice of an electron dose. The dose should be as low as possible to minimize object damage, yet as high as possible to optimize image statistics. For specimens that are protected by low temperatures or for which the low resolution associated with negative stain is acceptable, the first condition may be partially relaxed, allowing the use of (for example) 6 to 10 e/Å2. However, this medium dose is marginal for obtaining the contrast transfer function (CTF) of the microscope, which is necessary to allow phase corrections to the image. We have explored two parameters that affect the CTF under medium dose conditions.Figure 1 displays the CTF for carbon (C, row 1) and triafol plus carbon (T+C, row 2). For any column, the images to which the CTF correspond were from a carbon covered hole (C) and the adjacent triafol plus carbon support film (T+C), both recorded on the same micrograph; therefore the imaging parameters of defocus, illumination angle, and electron statistics were identical.

Possible applications of fraunhofer holography in high resolution electron microscopy

1978 ◽  
Vol 36 (1) ◽  
pp. 222-223 ◽  
Author(s):  
N. Bonnet ◽  
M. Troyon ◽  
P. Gallion
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Transfer Function ◽  
Radiation Damage ◽  
High Resolution Electron Microscopy ◽  
Far Field ◽  
Field Region ◽  
Crystalline Materials ◽  
Resolution Electron ◽  
The Ideal

Two main problems in high resolution electron microscopy are first, the existence of gaps in the transfer function, and then the difficulty to find complex amplitude of the diffracted wawe from registered intensity. The solution of this second problem is in most cases only intended by the realization of several micrographs in different conditions (defocusing distance, illuminating angle, complementary objective apertures…) which can lead to severe problems of contamination or radiation damage for certain specimens.Fraunhofer holography can in principle solve both problems stated above (1,2). The microscope objective is strongly defocused (far-field region) so that the two diffracted beams do not interfere. The ideal transfer function after reconstruction is then unity and the twin image do not overlap on the reconstructed one.We show some applications of the method and results of preliminary tests.Possible application to the study of cavitiesSmall voids (or gas-filled bubbles) created by irradiation in crystalline materials can be observed near the Scherzer focus, but it is then difficult to extract other informations than the approximated size.

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