A simple method for labelling proteins with211At via diazotized aromatic diamine

A simple and rapid method for labelling proteins with²¹¹At by means of a 1,4-diaminobenzene link is described. 1,4-diaminobenzene is transformed into the diazonium salt and subsequently reactions of both²¹¹At and proteins with the diazonium salt take place simultaneously. For possibly high yields of astatized protein an appropriate temperature of 273 K was found. The results demonstrate the difference between the reaction mechanisms of iodine and astatine with proteins.     

Hamiltonian structure of the nonlinear sigma model in light front coordinates

Theoretical and Mathematical Physics -     

The total hadronic cross section for e+e− annihilation between 3.1 and 4.8 GeV center of mass energy

Using the solenoidal magnetic detector PLUTO, we have measured the total cross section for e⁺e^? annihilation into hadrons. Results are presented for center of mass energies between 3.6 and 4.8 GeV, and in the regions of the $\text{J}\text{ψ}$(3.1) and ψ(3.7) resonances. We also present results for the 2 prong cross section in the energy range 3.6 to 4.8 GeV.     

Seven new hindered isomeric rhodopsins: A reexamination of the stereospecificity of the binding site of bovine opsin

Results of interaction of seven new geometric isomers of retinal (7-cis, 7,9-dicis; 7,11-dicis, 7,13-dicis; 9,11-dicis 7,9,11-tricis 7,9,13-tricis) with bovine opsin are reported. All of them form pigments with absorption maxima varying between 450 and 480 nm. The rates of pigment formation were generally considerably lower than those of 11-cis-retinal and the yields were less than quantitative. Implications of these results for the stereospecificity of the binding site of opsin are discussed.     

On the light-cone quantization of non-abelian gauge theory

The implications of periodic boundary conditions in the light-cone quantization of non-abelian fields are studied. Formulation of the theory in the singularity-free case is presented. Some consequences of field singularities are discussed.