Phase contrast, ultraviolet microscopy, and freeze-etching were used to determine the amount of exocellular polymer surrounding unfixed cells of four genera of bacteria: Azotobacter vinelandii, Zoogloea ramigera, Leuconostoc mesenteroides, and an acid-tolerant, floc-forming Bacillus species. Thin-sectional electron microscopy was employed to measure the effectiveness of a modified ruthenium red...

Ruthenium complexes offer new perspectives in cancer therapy; towards this aim we have synthesized a new amphiphilic unimer able to coordinate ruthenium complexes and to form liposomes.

Ruthenium red induces the agglutination of ascites hepatoma cells. The agglutination was inhibited by acidic polysaccharides but not by haptenic inhibitors of some plant agglutinins. The agglutination was also abolished by treatment of the cells with a low concentration of papain. Papain digestion causes a decrease in the number of microvilli on the cell surface and the release of carbohydrate-...

A ruthenium-catalyzed hydrative cyclization of enynes has been developed. The reaction converts a range of 1,5-enynes bearing terminal alkyne and Michael acceptor moieties into cyclopentanone derivatives. From extensive catalyst screening experiments, a trinuclear ruthenium complex, [Ru3(dppm)3Cl5]PF6, has been identified to be an effective catalyst in mediating the 1,1-difunctionalization of a...

We introduce a strategy for the verification of relational specifications based on the analysis of monotonicity of variables within formulas. By comparing with the Alloy Analyzer, we show that for a relevant class of problems this technique outperforms analysis of the same problems using SAT-solvers, while consuming a fraction of the memory SAT-solvers require.

Alloy is a formal modeling language based on first-order relational logic, with no native support for specifying reactive systems. We propose an extension of Alloy to allow the specification of temporal formulas using LTL, and show how they can be verified by bounded model checking with the Alloy Analyzer.

Department of Chemistry, Kongunadu Arts and Science College, Coimbatore – 641029, India Post Graduate and Research Department of Chemistry, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore – 641020, India. ABSTRACT: Six new organosoluble ruthenium(II) complexes bearing dibasic tetradentate Schiff base ligands of the general formula [Ru(CO)(PPh3)(L)] (where L = dibasic t...

II 1 A group of five new ruthenium(II) bipyridine heterochelates of the type [Ru (bpy) L] 1a–1e have been synthesized (bpy52,292 bipyridine; L5anionic form of the thiol-based imine ligands, HS–C H N=C(H)C H (R) (R5OMe, Me, H, Cl, NO ). The complexes 6 4 6 4 2 1a21e are 1:1 conducting and diamagnetic. The complexes 1a21e exhibit strong MLCT transitions in the visible region and intra-ligand tran...

Photocatalysis. In their Communication (e202304474), Markus R. Heinrich et al. demonstrate the linkage of ruthenium photocatalysis with chemiluminescence read-out from a 1,2-dioxetane. The ruthenium-dioxetane system was shown to be useful for quantification optical input by inverse correlation output.

Ruthenium(III) chloride-catalyzed acylation of a variety of alcohols, phenols, and thiols was achieved in high yields under mild conditions (room temperature) in the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF(6)]). The ionic liquid and ruthenium catalyst can be recycled at least 10 times. Our system not only solves the basic problem of ruthenium catalyst reuse, but ...