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Digitale Medien

Muonic atoms testing the electron propagator of quantum electrodynamics and the Higgs boson contribution (1983)

Bauer, W. G. ; Salecker, H.

Springer

Foundations of physics 13 (1983), S. 115-132

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ISSN: 1572-9516

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract In this work we consider the energy states of muonic atoms which are predominantly influenced by vacuum polarization. This fact is used for testing the electron propagator of QED with the modification $$S(p) = (\not p - me)^{ - 1} + f(\not p - M)^{ - 1}$$ . The data of some well analyzed transitions in muonic He, Si, Ba, and Pb yield the limit M〉29 MeV for f=1. Similarly the presence of a Higgs boson would cause a shift of the energy levels which can be measured easier in muonic atoms since the coupling grows with the fermion mass. The analysis of several transitions in heavy muonic atoms shows, that the mass of the Higgs boson is larger than 12.8 MeV. Further reductions of the present-day uncertainties concerning the experimental data and especially of the nuclear structure effects could improve these limits.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01889415

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Digitale Medien

Spot inoculation of soybean roots withRhizobium japonicum (1983)

Turgeon, B. G. ; Bauer, W. D.

Springer

Protoplasma 115 (1983), S. 122-128

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ISSN: 1615-6102

Schlagwort(e): Inoculation ; Nodulation ; Rhizobium japonicum ; Soybean ; Symbiosis

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary A method has been developed to inoculate soybean roots in the zone of susceptible root cells with nanoliter droplets containing the symbiont,Rhizobium japonicum. The position of inoculation is marked by means of ion exchange beads which adhere to the root surface. InoculatedR. japonicum cells from a nanoliter droplet spread over an area of approximately 35 host epidermal cells and have a high probability (∼ 80%) of inducing nodule formation at exactly the point of inoculation. The spot inoculation method is highly efficient in terms of the number of bacteria required to achieve a given probability of nodule formation. The method greatly facilitates ultrastructural analysis of the infection process and is useful for certain physiological studies of infection.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01279804

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