The inhibitory activity of liver extracts on thymidine incorporation into DNA was markedly enhanced by manganese and zinc. Manganese-activated liver extract (Mn-liver extract) also inhibited incorporation of deoxycytidine and adenine into DNA. The Mn-liver extract had no effect on incorporation of thymidine-5'-triphosphate into DNA but blocked the phosphorylation of deoxythymidine. The phosphor...

The inhibitory activity of liver extracts on thymidine incorporation into DNA was markedly enhanced by manganese and zinc. Manganese-activated liver extract (Mn-liver extract) also inhibited incorporation of deoxycytidine and adenine into DNA. The Mn-liver extract had no effect on incorporation of thymidine-5'-triphosphate into DNA but blocked the phosphorylation of deoxythymidine. The phosphor...

Addition of an anionic donor to an Mn(V) (O) porphyrinoid complex causes a dramatic increase in 2-electron oxygen-atom-transfer (OAT) chemistry. The 6-coordinate [Mn(V) (O)(TBP8 Cz)(CN)](-) was generated from addition of Bu4 N(+) CN(-) to the 5-coordinate Mn(V) (O) precursor. The cyanide-ligated complex was characterized for the first time by Mn K-edge X-ray absorption spectroscopy (XAS) and gi...

The use of the highly sterically demanding Cp(BIG) ligand (Cp(BIG) = C5(4-nBuC6H4)5) and white phosphorus (P4) enables the synthesis of new P-rich derivatives of the rare Pn ligand complexes of manganese. The obtained complexes, [{Cp(BIG)Mn}2(μ,η(5:5)-P5)] (2) and [{Cp(BIG)Mn}2(μ,η(2:2)-P2)2] (3), exhibit the highest number of P atoms in this class of manganese compounds identified by X-ray str...

The synthesis of 4'-CN, 5'-CN and 5'-Br substituted pyDTDA neutral radical bidentate ligands is reported (pyDTDA = 4-(2'-pyridyl)-1,2,3,5-dithiadiazolyl). The Ni(hfac)(2) and Mn(hfac)(2) coordination complexes of both cyano substituted ligands, and the Mn(hfac)(2) coordination complex of the bromo substituted ligand, have been prepared and the crystal packing of these is compared (hfac = 1,1,1,...

A new silver aluminium trimangan-ese penta-molybdate {silver(I) trimanganese(II) aluminium penta-kis-[tetra-oxidomolybdate(VI)]}, AgMn(II) 3(Mn(III) 0,26Al0,74)(MoO4)5, has been synthesized using solid-state methods. The structure is composed of M 2O10 dimers, M 3O14 (M = Mn, Al) trimers and MoO4 tetra-hedra sharing corners and forming three types of layers A, B and B'. The sequence of the cons...

Reaction of the Single Molecule Magnet [Mn(12)O(12)(CH(3)CO(2))(16)(H(2)O)(4)] (Mn(12)) with mesogenic dendritic ligands Li (i = 4, 5) quantitatively yields functional clusters [Mn(12)O(12)(Li-H)(16)(H(2)O)(4)] (i = 4, 5) that self-organize into a thermotropic SmA-type liquid crystalline phase. The perturbation of the molecular interface by methylation of the terminal mesogenic cyanobiphenyl gr...

Manganese (Mn) toxicity in crops is a serious problem in Hawaii, especially Kauai and Oahu, where most soils are highly weathered. To devise a management strategy to control Mn toxicity, a greenhouse experiment was conducted on an acid (pH 4.4) Oxisol (Wahiawa series) having 15g·kg total Mn. Factorial combinations of lime (0, 2.0, and 4.0 g·kg CaCO3) and two composts (made from chicken manure a...

Soluble manganese(III) [Mn(III)] has been thought to disproportionate to soluble Mn(II) and particulate Mn(IV)O2 in natural waters, although it persists as complexes in laboratory solutions. We report that, in the Black Sea, soluble Mn(III) concentrations were as high as 5 micromolar and constituted up to 100% of the total dissolved Mn pool. Depth profiles indicated that soluble Mn(III) was pro...

The reaction of trans-[Fe(R-bpb)(CN)2]- (R-bpb2-=R-substituted-1,2-bis(pyridine-2-carboxamido)benzenate) with trans-Mn(III) Schiff base complexes [Mn(5-X-saltn)]ClO4 (5-X-saltn2-=N,N'-propanolbis(5-X-substituted-salcylideneiminato) dianion) gave rise to cyanide-bridged neutral binuclear [MnFe] compounds [Mn(saltn)(MeOH)][Fe(bpb)(CN)2].3H2O (), [Mn(saltn)(H2O)Fe(bpmb)(CN)2].H2O (), [Mn(saltn)(Me...