Photoproduction of pions and properties of baryon resonances from a Bonn-Gatchina partial wave analysis

Masses, widths and photocouplings of baryon resonances are determined in a coupled-channel partial wave analysis of a large variety of data. The Bonn-Gatchina partial wave formalism is extended to include a decomposition of t- and u-exchange amplitudes into individual partial waves. The multipole transition amplitudes for $\gamma p\to p\pi^0$ and $\gamma p\to n\pi^+$ are given and compared to results from other analyses.Comment: 18 pages, 14 figure

P-wave excited baryons from pion- and photo-induced hyperon production

We report evidence for $N(1710)P_{11}$, $N(1875)P_{11}$, $N(1900)P_{13}$, $\Delta(1600)P_{33}$, $\Delta(1910)P_{31}$, and $\Delta(1920)P_{33}$, and find indications that $N(1900)P_{13}$ might have a companion state at 1970\,MeV. The controversial $\Delta(1750)P_{31}$ is not seen. The evidence is derived from a study of data on pion- and photo-induced hyperon production, but other data are included as well. Most of the resonances reported here were found in the Karlsruhe-Helsinki (KH84) and the Carnegie-Mellon (CM) analyses but were challenged recently by the Data Analysis Center at GWU. Our analysis is constrained by the energy independent $\pi N$ scattering amplitudes from either KH84 or GWU. The two $\pi N$ amplitudes from KH84 or GWU, respectively, lead to slightly different $\pi N$ branching ratios of contributing resonances but the debated resonances are required in both series of fits.Comment: 22 pages, 28 figures. Some additional sets of data are adde

Properties of baryon resonances from a multichannel partial wave analysis

Properties of nucleon and $\Delta$ resonances are derived from a multichannel partial wave analysis. The statistical significance of pion and photo-induced inelastic reactions off protons are studied in a multichannel partial-wave analysis.Comment: 12 pages, 8 Table

Studies on the antigenic properties of the Fd-fragment of a human G-myeloma protein (Daw)

The present investigation deals with an immunochemical approach in studies on the structure of Fd-fragments of human immunoglobulins. Rabbits were immunized with a preparation of Fd-fragment of a human G-myeloma protein (Daw) [1]. Detailed studies on the reactions of the rabbit antiserum with a panel of antigens demonstrated that antibodies were obtained against an idiotypic site on the Fd- or the Fab-fragment of the Daw immunoglobulin molecule. No antibodies against any common region of the Fd-fragment could be detected in immunodiffusion experiments with the antigens used, a finding confirmed by the outcome of various haemagglutinating experiments. Structural implications of these findings are discussed

Acute phase reactants and complement components as indicators of recurrence in human cervical cancer

Twenty patients with invasive cervical cancer of the squamous cell type were treated by radiotherapy and/or radical hysterectomy. During a follow-up period of approximately 2 yr in 10 of these patients a recurrence was established. Serial determinations of three acute phase reactants (α1-acid glycoprotein, haptoglobin and C-reactive protein) and of three complement components (C4, C3-proactivator and C9) were performed before and after therapy and either at the time of recurrence (recurrence group), or at the end of the follow-up period (non-recurrence group). Sequential analysis of the serum levels of all the parameters tested showed a significant increase at the time of recurrence. The most conclusive results were obtained with haptoglobin and the C9-component of complement

Acute phase reactants and complement components as indicators of recurrence in human cervical cancer

Twenty patients with invasive cervical cancer of the squamous cell type were treated by radiotherapy and/or radical hysterectomy. During a follow-up period of approximately 2 yr in 10 of these patients a recurrence was established. Serial determinations of three acute phase reactants (α1-acid glycoprotein, haptoglobin and C-reactive protein) and of three complement components (C4, C3-proactivator and C9) were performed before and after therapy and either at the time of recurrence (recurrence group), or at the end of the follow-up period (non-recurrence group). Sequential analysis of the serum levels of all the parameters tested showed a significant increase at the time of recurrence. The most conclusive results were obtained with haptoglobin and the C9-component of complement

Immunoglobulin determination evaluation of the results of immunoelectrophoretic analysis and the radial diffusion method

A comparative study was made of the results of immunoglobulin determination in sera using immunoelectrophoresis and the radial diffusion method of Mancini. The results indicated that, except for certain ranges of immunoglobulin concentration (low, normal or slightly increased) the data obtained by immunoelectrophoresis are unreliable and do not correlate with the values obtained by the Mancini method

Serum immunoglobulins in healthy children and adults levels of the five classes, expressed in international units per millilitre

Serum levels of IgM, IgG, IgA, IgD, and IgE were determined in serum samples of 270 healthy Dutch children (aged 4–13 years) and of 30 healthy Dutch adults, the amounts being expressed in International Units per millilitre. Special attention is given to the IgD and IgE results, since the IgM, IgG, and IgA levels in mg per 100 ml of these sera and their implications have already been reported. In the children's sera the occurrence of relatively high IgD and IgE levels was frequently observed, whereas the adult group did not show excessive variation in this respect. The mean IgD levels found for adult males and females are 21 I.U./ml and 24 I.U./ml, respectively; the mean IgE levels for the same groups are 68 I.U./ml and 88 I.U./ml, respectively. The mean IgD and IgE levels in the children of each year group were usually higher than those of the adult group, but the difference between the mean level of each of the juvenile groups and the mean level of the adult group was not statistically significant. A statistically significant influence of sex and season on the IgD and IgE levels could not be demonstrated in this material either. Three of the 270 children's sera showed an exceptionally low IgA content. In two of these cases the serum was sampled and studied a second time after an interval of four years, when the IgA deficiency proved to be still present. The IgE levels in the sera of these healthy IgA-deficient children were normal, whereas the presence of IgD could not be demonstrated