scholarly journals Ultra-low temperature carbon (di)oxide hydrogenation catalyzed by hybrid ruthenium–nickel nanocatalysts: towards sustainable methane production

2020 ◽  
Vol 22 (15) ◽  
pp. 5143-5150 ◽  
Author(s):  
Tomasz Siudyga ◽  
Maciej Kapkowski ◽  
Piotr Bartczak ◽  
Maciej Zubko ◽  
Jacek Szade ◽  
...  
Keyword(s):  
Low Temperature ◽  
Temperature Effect ◽  
Methane Production ◽  
Methane Conversion ◽  
Ni Catalyst

Syngas to methane conversion can be attained in flow at temperatures starting from −7 °C with a hybrid bimetallic Ru/Ni catalyst. In turn, the ultra-low temperature effect cannot be observed for the Re/Ni and Pd/Ni combinations.

scholarly journals GENETIC EVIDENCE FOR INTERACTION BETWEEN NONHOMOLOGOUS PROTEINS IN YEAST AND A CASE OF SUPPRESSION AT THE HIS1 LOCUS

Genetics ◽  
1980 ◽  
Vol 94 (2) ◽  
pp. 327-339 ◽  
Author(s):  
Richard Snow
Keyword(s):  
Enzyme Activity ◽  
Low Temperature ◽  
Enzymatic Activity ◽  
Temperature Effect ◽  
Conformational Change ◽  
Minimal Medium ◽  
Genetic Evidence ◽  
Structural Genes ◽  
Wild Type ◽  
Is Strain

ABSTRACT The HIS1 and THR4 loci are the structural genes for phosphoribosyl-ATP pyrophosphorylase and threonine synthetase, respectively. The allele his1-IS has no enzyme activity at 30", but does have activity at 15" provided the cell contains the wild-type THR4 allele or a suppressing allele at another locus, designated SUP(his1-1S). Under these conditions, cells with the hisl-IS mutation are capable of growth on minimal medium at 15". Three kinds of reversions of a hisl-IS thr4 sup(his1-IS) strain to histidine prototrophy have been obtained: (1) his1-IS locus reversions to HIS1 that restore growth without added histidine at 30", (2)  thr4 reversions to THR4 that simultaneously eliminate the requirement for threonine and restore the low-temperature effect on the his1-IS allele, and (3)mutations from sup to SUP. The SUP allele is not an ochre suppressor, and it is not linked to either HISI, THR4 or a centromere. It may represent a missense suppressor. I t is proposed that the effect ofTHR4 is caused by aggregation of the wild-type threonine synthetase with defective his1-IS monomers, causing a favorable conformational change in the histidine protein that restores limited enzymatic activity. This can be regarded as a case of complementation between nonhomologous proteins.

scholarly journals Low-temperature effect on the impact and flexural behaviour of basalt composite laminates

2020 ◽  
Vol 249 ◽  
pp. 112607 ◽  
Author(s):  
M.R. Ricciardi ◽  
I. Papa ◽  
F. Impero ◽  
A. Langella ◽  
V. Lopresto ◽  
...  
Keyword(s):  
Low Temperature ◽  
Temperature Effect ◽  
Composite Laminates ◽  
Flexural Behaviour ◽  
The Impact
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