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- Fröjmark, Anders
(author)
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Mirakler och helgonkult : Linköpings biskopdöme under senmedeltid
- 1992
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Doctoral thesis (other academic/artistic)abstract
- This work studies the introduction of three new cults of saints in the Linköping Bishopric during the Late Middle Ages. Two of them were based at Vadstena Convent: the Holy Bridgel (Birgitta, d. 1373) cult which had its beginning in 1374 and the cult of Katarina Ulfsdotter (d. 1381), which started during the 1410's. The third, the cult of Bishop Nils Hermansson (d. 1391), which originated at the latest in I40l. was associaled w ith the cathedral in Linköping.The introduction of a saint's cult may be relaled to the need of many people in medieval society for healing and protection. The tales about the saint's posthumous miracles played a key role in the introductory phase of the cults. In the dissertation such tales are used as the foundation for the analysis of the varied geographic and social patterns of distnbution of the three cults.The cult of the Holy Bridget was as much an intemational as a Swedish cult. The other cults studied were two of manv attempts to ride on the wave created by the successes of the Bridget cult. They may furthermore be regarded a response to various types of crises which the sponsoring institutions experienced.
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- Molin, Nils-Erik, et al.
(author)
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Transient wave response of the violin body
- 1990
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In: Journal of the Acoustical Society of America. - : Acoustical Society of America (ASA). - 0001-4966 .- 1520-8524. ; 88:5, s. 2479-2481
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Journal article (peer-reviewed)abstract
- In this investigation, the dispersive, transient wave propagation field of a complete violin excited by a mechanically induced impulse at the top of the bridge is presented. By means of double pulsed holographic interferometry with a ruby laser as light source the propagating wave field is recorded. From presented interferograms, it is seen that initially the top plate acts mainly as a nonsymmetric dipole with centers at the two bridge feet. The back plate is strongly coupled to the motion of the top plate by the sound post and acts more like a monopole. Thus the position of the sound post is crucial to the performance of the instrument. The free edges at the f-holes are very early reached by the dispersive bending waves of high amplitude probably giving a significant contribution to the sound of the violin family instruments
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- Molin, Nils-Erik, et al.
(author)
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Transient wave response of the violin body revisited
- 1991
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In: Journal of the Acoustical Society of America. - : Acoustical Society of America (ASA). - 0001-4966 .- 1520-8524. ; 90:4, s. 2192-2195
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Journal article (peer-reviewed)abstract
- In this investigation, the dispersive, transient wave propagation field of the top plate of a complete violin excited by a mechanically induced pulse at the top of the bridge is presented. A similar investigation has previously been made for excitation parallel with the top plate and is now completed with excitation perpendicular to the plate. From presented interferograms, it is seen that the top plate initially deforms in a nonsymmetric two-pole with centers at the two bridge feet. Shortly thereafter the two poles (valleys) are joined into one, but after 0.30 ms the displacement is still nonsymmetric with maximum motion at the bridge foot closest to the excitation point. From the measurements it can be concluded that for excitation parallel with the top plate, the plate between the f-holes acts mainly as a dipole, but with excitation perpendicular the same part acts mainly as a monopole. Thus the excitation of the top plate when playing the violin depends on the angle of the bow in relation to the top plate and should influence the tone character
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- Tunlid, Anders, et al.
(author)
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Fungal attachment to nematodes
- 1992
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In: Mycological Research. - 0953-7562. ; 96:6, s. 401-412
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Research review (peer-reviewed)abstract
- The adhesion mechanisms in three nematophagous fungi are reviewed. In all these fungi the infection and subsequent digestion of nematodes is initiated by the firm adhesion of the fungus to the nematode surface. In Arthrobotrys oligospora the adhesive phase is restricted to special three-dimensional structures. Drechmeria coniospora conidia attach to the nematode cuticle by an adhesive bud while Catenaria anguillulae uses an adhesive phase of zoospore development for this purpose. In A. oligospora, the adhesion of nematodes to the traps is mediated by a layer of extracellular fibrillar polymers. The ultrastructure of this layer changes during adhesion, the fibrils become more dense and oriented in one direction. The surface layer consists mainly of carbohydrate-containing fibrils and a low-molecular-weight protein. Previous and present studies show that the low-molecular-weight protein of A. oligospora is a lectin. In contrast, the adhesive layer of D. coniospora does not seem to change during the adhesion process. The adhesin of C. anguillulae appears to consist mainly of protein. The studies suggest that adhesion of nematodes to A. oligospora involves a recognition event using a lectin-carbohydrate interaction which might trigger the reorganization of the surface polymer layer and release of enzymes, leading to the firm binding of the nematode. A similar process may take place also in other nematophagous fungi.
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- Tunlid, Anders, et al.
(author)
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Infrared monitoring of the adhesion of Catenaria anguillulae zoospores to solid surfaces
- 1991
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In: Experimental Mycology. - : Elsevier BV. - 0147-5975. ; 15:3, s. 206-214
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Journal article (peer-reviewed)abstract
- Electron microscopic studies of nematodes infected with the chytridiomycetous fungusCatenaria anguillulae indicated that zoospores of the fungus adhered to the cuticle of nematodes by a layer of extracellular polymers. The chemical composition of the adhesive polymers and their interaction with a solid surface were examined with Fourier transform infrared spectroscopy, using an attenuated total reflectance cell. On-line monitoring of the adhesion of zoospores to a germanium crystal with this technique showed that the adhesive polymers consisted of a protein(s) containing amide I and II bands. The adsorption of these proteins, measured as the increase in the amide II band, had a rapid initial phase of ca. 20 minutes, followed by a slower increase during the course of incubation. Fluorescein isothiocyanate staining of the attached cells at the end of the experiment showed that the adhesion of the zoospores occurred before the formation of the cyst wall.
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