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The Response of Work Function οf Thin Metal Films to Interaction with Hydrogen

100%

Duś R., Nowicka E., Nowakowski R.

Acta Physica Polonica A

2008

vol. 114

issue S

S-29-S-47

The aim of this paper is to summarize the results of experiments carried out at our laboratory on the response of the work function of several thin films of transition metals and rare earth metals to interaction with molecular hydrogen. The main focus concerns the description of surface phenomena accompanying the reaction of hydride formation as a result of the adsorbate's incorporation into the bulk of the thin films. Work function changes Δ Φp caused by adsorption and reaction concern the surface, hence this experimental method is appropriate for solving the aforementioned problem. A differentiation is made between the work function changes ΔΦp due to creation of specific adsorption states characteristic of hydrides, and ΔΦp arising as a result of surface defects and protrusions induced in the course of the reaction. The topography of thin metal films and thin hydride films with defects and protrusions was illustrated by means of atomic force microscopy. For comparison, the paper discusses work function changes caused by H_2 interaction with thin films of metals which do not form hydrides (for example platinum), or when this interaction is performed under conditions excluding hydride formation for thermodynamic reasons. Almost complete diminishing of ΔΦp was observed, in spite of significant hydrogen uptake on some rare earth metals, caused by formation of the ordered H-Y-H surface phase.

Possible disease-modifying factors: the mannan-binding lectin pathway and infections in hereditary angioedema of children and adults

64%

Cedzynski M., Madalinski K., Gregorek H., Swierzko A. S., Nowicka E., Obtulowicz K., Dzierzanowska-Fangrat K., Wojda U., Rabczenko D., Kawakami M.

Archivum Immunologiae et Therapiae Experimentalis

2008

vol. 56

issue 1

69-75

The study was performed in 65 patients with HAE and 113 healthy persons. The parameters measured were C1-INH, C4, MBL concentration and MBL/MASP-2 complex activity, and serological markers of H. pylori, HBV, and HCV infection. Scores for the frequency and severity of HAE symptoms were determined. Results: HAE scores were significantly higher in patients whose C1-INH activity did not exceed 10% than in patients with activity of 10?52% (p=0.016). No significant differences were found in the median levels of MBL concentration and MBL/MASP-2 complex activity between patients and the control group. There was a slight association between contact with H. pylori in patients and HAE symptom score (p=0.052, not significant). Adult patients showed a 2.6-times higher frequency of anti-HBc than the general population. HBV DNA was negative in anti-HBc(+) patients. Conclusions: These results suggest that the MBL complement activation pathway itself does not contribute to the frequency of angioedema attacks. Infections with H. pylori and HBV may slightly influence the disease score (not significant).

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1 Acta Physica Polonica A

1 Archivum Immunologiae et Therapiae Experimentalis

2 2008

2 Nowicka E.

1 Cedzynski M.

1 Duś R.

1 Dzierzanowska-Fangrat K.

1 Gregorek H.

1 Kawakami M.

1 Madalinski K.

1 Nowakowski R.

1 Obtulowicz K.

1 Rabczenko D.

1 Swierzko A. S.

1 Wojda U.

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The Response of Work Function οf Thin Metal Films to Interaction with Hydrogen

Possible disease-modifying factors: the mannan-binding lectin pathway and infections in hereditary angioedema of children and adults