Configuration Space of Surface–Surface Contact

We consider a space X of constant curvature (Euclidean, elliptic, and hyperbolic space, and the sphere). The set of isometries of X transforming a surface such that it touches a second surface is called the configuration space of surface–surface contact. We investigate when this subset of Isom(X) is an immersed submanifold (which depends on the principal curvatures of the surfaces involved), and when it is an embedded submanifold (which depends on the size and shape of the given surfaces).     

Polyamide resin: A novel immunoadsorbent

A solid phase assay for radiolabeled antibody synthesizedde novo in vitro has been described (1). The solid phase consists of antigen covalently bound to bromacetyl cellulose, a useful but difficult to prepare immunoadsorbent. Herein, we describe the preparation of polyamide resin immunoadsorbent and the procedure for coupling antigen to the polymer. Data are presented that show that polyamide resin-Ag? conjugates can replace bromacetyl cellulose-Ag conjugates. The usefulness of this easily prepared and inexpensive immunoadsorbent is discussed.     

Orbits in finite incidence structures

Geometriae Dedicata -     

Über Kennzeichnungen endlicher Gruppenräume

Ohne ZusammenfassungMeinem verehrten Lehrer Günter Picken zum 70. Geburtstag gewidmet     

Study of the mechanism of hydroformylation at industrial reaction conditions

With a newly developed analytical technique, i.e. high temperature/pressure IR cell coupled to the reactor, it was possible to study the mechanism of hydroformylation at reaction conditions. It has been conclusively found that the hydrogenolysis of the acyl cobalt complex is performed by HCo(CO)₄ and not by molecular H₂, as proposed byHeck andBreslow.Therefore the formation of HCo(CO)₄ from Co₂(CO)₈ is an intermediate step in the sequence of hydroformylation reaction steps. The rate of hydroformylation of any of the olefins is smaller than the rate of formation of HCo(CO)₄ from Co₂(CO)₈. The IR spectra reveal that always more than 30% of the cobalt is in the form of HCo(CO)₄ under the reaction conditions.It is found that the formation of HCo(CO)₄ from Co₂(CO)₈ is the slowest and most temperature-dependent step of the hydroformylation reaction. Also the reaction between olefin and HCo(CO)₄ is slower than the hydrogenolysis of the acyl complex.The experiments were carried out under industrial oxo conditions. The diffusional effects were eliminated.With 6 FiguresPart of the Ph.D. dissertation 1974. N. H. Alemdarolu, J. M. L. Penninger, andE. Oltay, Mechanism of Hydroformylation, Part II. Mh. Chem.107, 1043 (1976).