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Properties and activity of the cobalt catalysts for NH3synthesis obtained by co-precipitation – the effect of lanthanum addition

100%

Zybert M., Karasińska M., Truszkiewicz E., Mierzwa B., Raróg-Pilecka W.

Polish Journal of Chemical Technology

2015

vol. 17

issue 1

138-143

In modern research on catalysts for NH3 synthesis a lot of attention is paid to cobalt. In this work the new catalytic systems based on cobalt are presented. Unsupported cobalt catalysts singly promoted (La or Ba) and doubly promoted (La and Ba) were prepared and tested in NH3 synthesis reaction under commercial synthesis conditions. Characterization studies revealed that lanthanum plays a role of a structural promoter, which improves the surface of catalyst precursors and prevents from sintering during calcination. However, lanthanum has a negative effect on the reduction of cobalt oxide, but the addition of barium promoter (Co/La/Ba catalyst) diminishes the negative impact of La. The co-promotion of cobalt with lanthanum and barium results in the increasing of the active phase surface and improvement of its activity in NH3 synthesis.

Plant Metallothioneins: Putative Functions Identified by Promoter Analysis in Silico

100%

Dąbrowska G.

Acta Biologica Cracoviensia s. Botanica

2012

vol. 54

issue 2

A common cis-element in promoters of protein synthesis and cell cycle genes

86%

Wyrwicz L. S., Gaj P., Hoffmann M., Rychlewski L., Ostrowski J.

Acta Biochimica Polonica

2007

vol. 54

issue 1

89-98

Gene promoters contain several classes of functional sequence elements (cis elements) recognized by protein agents, e.g. transcription factors and essential components of the transcription machinery. Here we describe a common DNA regulatory element (tandem TCTCGCGAGA motif) of human TATA-less promoters. A combination of bioinformatic and experimental methodology suggests that the element can be critical for expression of genes involved in enhanced protein synthesis and the G1/S transition in the cell cycle. The motif was identified in a substantial fraction of promoters of cell cycle genes, like cyclins (CCNC, CCNG1), as well as transcription regulators (TAF7, TAF13, KLF7, NCOA2), chromatin structure modulators (HDAC2, TAF6L), translation initiation factors (EIF5, EIF2S1, EIF4G2, EIF3S8, EIF4) and previously reported 18 ribosomal protein genes. Since the motif can define a subset of promoters with a distinct mechanism of activation involved in regulation of expression of about 5% of human genes, further investigation of this regulatory element is an emerging task.

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1 Acta Biochimica Polonica

1 Acta Biologica Cracoviensia s. Botanica

1 Polish Journal of Chemical Technology

1 2015

1 2012

1 2007

1 Dąbrowska G.

1 Gaj P.

1 Hoffmann M.

1 Karasińska M.

1 Mierzwa B.

1 Ostrowski J.

1 Raróg-Pilecka W.

1 Rychlewski L.

1 Truszkiewicz E.

1 Wyrwicz L. S.

1 Zybert M.

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Properties and activity of the cobalt catalysts for NH3synthesis obtained by co-precipitation – the effect of lanthanum addition

Plant Metallothioneins: Putative Functions Identified by Promoter Analysis in Silico

A common cis-element in promoters of protein synthesis and cell cycle genes