Human complement factor H

We isolated cDNA clones coding for the functionally important tryptic N-terminal38- kDa fragment of human complement control protein factor H using polyclonal and monoclonal antibodies to screen a human liver cDNA library cloned in a bacterial expression vector, PEX-1. By testing the reactivity of antibodies specific for the recombinant proteins produced by individual clones with proteolytic fragments of serum H the exact position of these cDNA clones within H was mapped. One clone, H-19, coding for the 38-kDa fragment of H was sequenced and found to code for 289 amino acids derived from the 38-kDa N-terminal fragment as well as for the first 108 amino acids belonging to the complementary 142-kDa tryptic fragment. The derived protein sequence could be arranged in 6 highly homologous repeats of about 60 amino acids each, the homology between the repeats being determined by the characteristic position of cysteine, proline, glycine, tyrosine and tryptophane residues. The region coding for the epitope recognized by one of our monoclonal antibodies was localized by subcloning restriction fragments of H-19 into the expression plasmid and testing for the expression of this epitope

A Comparison of the Coagulation Phenomena of Dialysed and Fresh Prepared Silver Iodide Sols

The coagulation values of potassium-, barium-, and lanthanum nitrate were compared for dialysed sols of silver iodide and silver iodide sols in statu nascendi. It has been shown that the behaviour of dialysed sols against these coagulating ions is practically the same as the behaviour of the sols in statu nascendi

A Comparison of the Coagulation Phenomena of Dialysed and Fresh Prepared Silver Iodide Sols

The coagulation values of potassium-, barium-, and lanthanum nitrate were compared for dialysed sols of silver iodide and silver iodide sols in statu nascendi. It has been shown that the behaviour of dialysed sols against these coagulating ions is practically the same as the behaviour of the sols in statu nascendi

Weakly correlated electrons on a square lattice: a renormalization group theory

We study the weakly interacting Hubbard model on the square lattice using a one-loop renormalization group approach. The transition temperature T_c between the metallic and (nearly) ordered states is found. In the parquet regime, (T_c >> |mu|), the dominant correlations at temperatures below T_c are antiferromagnetic while in the BCS regime (T_c << |mu|) at T_c the d-wave singlet pairing susceptibility is most divergent.Comment: 12 pages, REVTEX, 3 figures included, submitted to Phys. Rev. Let

Adsorption of Thorium on Silver Halides and Silver Thiocyanate Sols

The adsorption of thorium has been determined on freshly prepared, coagulated sols of silver halides and silver thiocyanate. The amount of adsorbed thorium has been measured radiometrically by addition of thorium-234. It was found that the adsorption of thorium was much stronger on positively charged sols; on the negatively charged sols the adsorption was much less pronounced . The acidity also influences the adsorption, so that it is higher at greates pH values (measured up to pH = 4.5). The adsorption is nearly equal on coagulated sols of silver chloride, silver bromide and silver iodide; on silver thiocyanate is considerably less

The Determination of the Charge of Some Inorganic Thorium Complexes with the Ion-exchange Method

Chemistry of ilhorirum complexes is now of particular interest but our knowledge is still inadequate. The thorium ion forms various coplexes with a great number of anions and in water solutions the salts of thorium are undergoing hydrolysis already at low pH values (pH>· 3.5)\u27 giving various products

Adsorption of Thorium on Silver Halides and Silver Thiocyanate Sols

The adsorption of thorium has been determined on freshly prepared, coagulated sols of silver halides and silver thiocyanate. The amount of adsorbed thorium has been measured radiometrically by addition of thorium-234. It was found that the adsorption of thorium was much stronger on positively charged sols; on the negatively charged sols the adsorption was much less pronounced . The acidity also influences the adsorption, so that it is higher at greates pH values (measured up to pH = 4.5). The adsorption is nearly equal on coagulated sols of silver chloride, silver bromide and silver iodide; on silver thiocyanate is considerably less

Na2V3O7, a frustrated nanotubular system with spin-1/2 diamond rings

Following the recent discussion on the puzzling nature of the interactions in the nanotubular system Na2V3O7, we present a detailed ab-initio microscopic analysis of its electronic and magnetic properties. By means of a non-trivial downfolding study we propose an effective model in terms of tubes of nine-site rings with the geometry of a spin-diamond necklace with frustrated inter-ring interactions. We show that this model provides a quantitative account of the observed magnetic behavior.Comment: 5 pages, 5 figures. Phys. Rev. Lett. (in press