Manipulation of large molecules by low-temperature STM: model systems for molecular electronics

2004 ◽  
Vol 399 (4) ◽  
pp. 175-225 ◽  
Author(s):  
Francesca Moresco
Keyword(s):  
Low Temperature ◽  
Molecular Electronics ◽  
Model Systems ◽  
Large Molecules

Manipulation of large molecules by low temperature STM

2004 ◽  
Vol 36 (2) ◽  
pp. 109-113 ◽  
Author(s):  
Francesca Moresco ◽  
Christian Joachim ◽  
Karl Heinz Rieder
Keyword(s):  
Low Temperature ◽  
Large Molecules

STATUS OF THE RADAPPERTIZATION OF MEATS1

1974 ◽  
Vol 37 (2) ◽  
pp. 86-93 ◽  
Author(s):  
D. B. Rowley ◽  
Abe Anellis ◽  
E. Wierbicki ◽  
A. W. Baker
Keyword(s):  
Sodium Chloride ◽  
Low Temperature ◽  
Proteolytic Enzymes ◽  
Model Systems ◽  
Human Consumption ◽  
Cured Meats ◽  
Radiation Resistant ◽  
Animal Feeding ◽  
Resistant Strains ◽  
Microbiological Data

Considerable progress has been made toward development of highly acceptable radappertized meats through application of a heat treatment to an internal temperature of 65–80 C to inactivate proteolytic enzymes before irradiation, low temperature (−30 ± 10 C) of the food during irradiation, and addition of low levels of tripolyphosphate and sodium chloride. To assure that radappertized meats are free of potential pathogens and spoilage microorganisms they are given a minimum radiation dose (MRD) computed to effect a 12 log cycle reduction in the most radiation resistant strains of Clostridium botulinum spores. Inoculated pack studies are carried out to obtain the specific microbiological data required for computing the MRD. Cured meats normally have a lower MRD than uncured meats. In model systems concentrations of sodium chloride (NaCl) up to 4.0% (w/v) present during irradiation had no effect on radiation resistance, but NaCl did inhibit recovery of irradiated spores. A mixture of salts (4.0% NaCl, 30 ppm NaNO2 500 ppm NaNO3) had essentially the same effect as NaCl alone. Of 11 genera of vegetative cells examined, Micrococcs radiodurans and Streptococcus faecium were shown to be the most resistant to low-temperature gamma irradiation. Before the radappertization process can be established commercially it is necessary to provide proof that products so treated are safe for human consumption. An intensive animal feeding study of radappertized (4.7–7.1 Mrads) beef was initiated in 1971 and is expected to be completed in 1976.

Conformationally controlled ultrafast intersystem crossing in bithiophene systems

2018 ◽  
Vol 20 (19) ◽  
pp. 13412-13418 ◽  
Author(s):  
Anders B. Skov ◽  
Martin A. B. Larsen ◽  
Mikkel B. Liisberg ◽  
Thorsten Hansen ◽  
Theis I. Sølling
Keyword(s):  
Solar Cell ◽  
Molecular Electronics ◽  
Model Systems ◽  
Intersystem Crossing

Bithiophenes serve as model systems for polythiophenes used in solar cell applications and molecular electronics. Bithiophene has two major conformations, where the disfavored cis-conformation shows a higher rate of intersystem crossing.

Reaction of the Five-Coordinate O-Nitrito Complex Fe(Por)(ONO) (Por = meso-tetra-arylporphyrinato) with THF Gives Two Six-Coordinate Isomers

2009 ◽  
Vol 62 (10) ◽  
pp. 1226 ◽  
Author(s):  
Tigran S. Kurtikyan ◽  
Astghik A. Hovhannisyan ◽  
Alexei Iretskii ◽  
Peter C. Ford
Keyword(s):  
Low Temperature ◽  
Density Functional ◽  
Adduct Formation ◽  
Solvent Free ◽  
Model Systems ◽  
Lewis Bases ◽  
Nitrogen Donor ◽  
Density Functional Computations

The effect of the proximal ligand on the coordination of the nitrite ligand to the heme model systems Fe(Por)(η1-ONO) (Por = meso-tetraarylporphyrinato dianion) was investigated by FTIR and UV-vis spectra in solvent free, low temperature, porous layered solids and by density functional computations. The reaction of the five-coordinate complex Fe(Por)(η1-ONO) with the ether tetrahydrofuran gives a mixture of the O-nitrito and N-nitrito isomers Fe(Por)(THF)(η1-ONO) and Fe(Por)(THF)(NO2), respectively. This observation is in contrast to earlier studies with nitrogen donor Lewis bases where the N-nitrito isomers were clearly the more stable of the six-coordinated complexes. The adduct formation is reversible; the five-coordinate O-nitrito complexes Fe(Por)(η1-ONO) were largely restored upon warming under vacuum pumping.

Porphyrin-based nanostructures: routes to molecular electronics

2000 ◽  
Vol 04 (04) ◽  
pp. 401-406 ◽  
Author(s):  
ANTHONY K. BURRELL ◽  
MICHAEL R. WASIELEWSKI
Keyword(s):  
Molecular Electronics ◽  
Light Harvesting ◽  
Three Dimensional ◽  
Electronic System ◽  
Reaction Centers ◽  
Model Systems ◽  
Molecular Electronic

The potential of porphyrins and related macrocycles for applications in molecular electronics owes much to the fundamental studies of the photosynthetic light-harvesting arrays and reaction centers. The use of model systems to better understand these essential processes has resulted in the development of an assortment of methodologies for functionalizing and constructing the complex three-dimensional nanostructures that will be essential for a successful molecular electronic system.

scholarly journals Low-Temperature Dephasing and Renormalization in Model Systems

2003 ◽  
Vol 72 (Suppl.A) ◽  
pp. 30-35 ◽  
Author(s):  
Dmitri S. Golubev ◽  
Gerd Schön ◽  
Andrei D. Zaikin
Keyword(s):  
Low Temperature ◽  
Model Systems
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