Rhône-Poulenc

About: Rhône-Poulenc is a based out in . It is known for research contribution in the topics: Alkyl & Catalysis. The organization has 8909 authors who have published 8934 publications receiving 182241 citations. The organization is also known as: Rhone-Poulenc.

Field-Induced Structures in Ferrofluid Emulsions.

Abstract: The field-induced structure in a monodisperse ferrofluid emulsion is studied. An applied magnetic field induces a magnetic dipole moment in each droplet. When the dipole-dipole interaction energy exceeds the thermal energy, a phase transition occurs as the fluid of randomly dispersed droplets changes to a solid of nearly equally sized and spaced columns. Our results show that the column spacing follows a relation ${d\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.33L}^{0.37}$ for cell thickness $3\ensuremath{\le}L\ensuremath{\le}800\ensuremath{\mu}\mathrm{m}$. A new theory, which treats the column shape more realistically, is developed to account for the results.

Chimeric gene comprising the arabidopsis histone H4 promoter for the transformation of plants

Abstract: The present invention relates to a chimeric gene for conferring to plants an increased tolerance to a herbicide. This chimeric gene comprises, in the direction of transcription, a promoter region, a transit peptide region, a sequence encoding glyphosate tolerance and a polyadenylation signal region, wherein the promoter region consists of at least one promoter of a plant histone gene enabling the expression of the herbicide tolerance protein in the regions of glyphosate accumulation. The present invention further provides vectors containing the present chimeric genes, as well as plant cells and plants transformed with such vectors which permit production of glyphosate-tolerant plants.

Claus catalysis and H2S selective oxidation

Abstract: This review article deals with the development of sulfur recovery from the Claus process to H2S selective oxidation. Governments are constantly tightening regulations to limit the emission of sulfur compounds into the air. This makes it necessary to constantly enhance the level of sulfur recovery from natural, refinery, or coal gasification geses, and many improvements in the Claus process have been introduced to this end. In this review, emphasis has been put on the mechanism of reactions occurring in most of the sulfur recovery units, reactions between H2S and SO2 or O2 and side reactions such as hydrolysis of COS and CS2 or sulfation of the catalyst.