Sich erlaufen. Pilgern als Identitätsstärkung

Against the background of an unexpected upswing in pilgrimages, this article states the thesis that pilgrimage enables a strengthening of one’s identity. In addition, the problem of a fragmented and indefinite identity is sketched, with reference to Zygmunt Bauman. In contrast stands a model of identity (connected with Albrecht Grçzinger) in which one contributes to a tradition in which one already is situated. In its main part, the article investigates the various factors of pilgrimage that contribute to this process of gaining one’s identity. Thus, a route frequented as much as theWay of St. James forms an already patterned space that offers the pilgrim traditioned roles to adopt. Walking, as a characteristic element of pilgrimage, is interpreted as physically generating and distinctively opening the space in which pilgrims understand themselves in the world. It also can be shown how walking as a form of physical being that leads from an instrumental relationship to one’s body to an immediate being in living one’s life, conveys certainty about one’s self and the world, activates one’s potential to overcome challenges, and provides self-empowerment. The author makes a strong case for a definition of pilgrimage oriented to an understanding of the hardship of crossing a foreign land, which is an image of a goal-oriented understanding of existence. The resulting poles of self-assurance and self-estrangement in pilgrimage are, in connection with Wilhelm Gräb, interpreted as an expression of a truly known but at the same time distanced self-understanding. Pilgrimage is therefore a form of physical self-interpretation in which people learn to view and be aware of their self-familiarity. Finally, against the background of this representation, criteria are elaborated for organizing a pilgrimage journey that is conducive to identity.

Heimat Fremde

Urlauber suchen die Ungebundenheit der Fremde. Aber entfliehen sie wirklich einem normierten, durchrationalisierten, von Rollenfestlegungen, Notwendigkeiten und Bekanntem geprägten „modernen“ Alltag, wie es das gängige kulturwissenschaftliche Erklärungsmuster des Urlaubs im Anschluss v.a.an Enzensberger, Cohen und Turner behauptet? Im Urlaub wird nach dieser Auffassung eine Gegenwelt auf Zeit gesucht, in der spielerisch Rollentausch und Identitätsverflüssigung möglich wird. Dieses Essay kontrastiert diese Auffassung des Urlaubs mit der Situationsdiagnose der Postmoderne von Zygmunt Bauman: In der Postmoderne ist bereits der Alltag durch spielerischen Wechsel verschiedener Rollen und die Vermeidung von Identitätsfestlegung geprägt. Im Folgenden werden überraschende Konsequenzen aus Baumans Diagnose für eine veränderte Funktion des Urlaubs aufgezeigt: Wenn der Lifestyleswitch den Alltag selbst zum Unterwegssein in der Fremde werden lässt, dann bleibt das nicht ohne Folgen für den Urlaub, so die zentrale These: Der Urlaub bleibt ein Kontrast zum Alltag, aber nun gerade indem er dem im Alltag nicht realisierbaren Wunsch nach Beheimatung folgt. Solche regressive touristische Heimatsuche geschieht durch Romantisierung, Erleben von Natur und Geselligkeit, Bestätigung von Vorwissen und neuerdings besonders in der Wellness durch reflexive leibliche Selbstbezüglichkeit und Spiritualität. Bewegt sich der Alltag in der unvertrauten Fremde, reist der Urlauber in die vertraute Heimat. Ausgehend von dieser These wird das Modell einer durch das Reisen geschulten alltagstauglichen fragmentarischen Identität entwickelt: Es wird gezeigt, dass Urlaub zugleich Verwandlung wie Vergewisserung bewirken kann, wenn im Ausprobieren fremder Kulturmuster spielerische Leichtigkeit mit Authentizität und Sinnverstehen verbunden werden.

Role of CYP27A1 in progesterone metabolism in vitro and in vivo

In the kidney, progesterone is inactivated to 20alpha-dihydro-progesterone (20alpha-DH-progesterone) to protect the mineralocorticoid receptor from progesterone excess. In an attempt to clone the enzyme with 20alpha-hydroxysteroid activity using expression cloning in CHOP cells and a human kidney expression library, serendipitously cDNA encoding CYP27A1 was isolated. Overexpression of CYP27A1 in CHOP cells decreased progesterone conversion to 20alpha-DH-progesterone in a dose-dependent manner, an effect enhanced by cotransfection with adrenodoxin and adrenodoxin reductase. Incubation of CHOP cells with 27-hydroxycholesterol, a product of CYP27A1, increased the ratio of progesterone/20alpha-DH-progesterone in a concentration-dependent manner, indicating that the effect of CYP27A1 overexpression was mediated by 27-hydroxycholesterol. In order to analyze whether these observations are relevant in vivo, progesterone and 20alpha-DH-progesterone were measured by GC-MS in 24-h urine of CYP27A1 gene knock out (ko) mice and their control wild type (wt) and heterozygote (hz) littermates. In CYP27A1 ko mice, urinary progesterone concentrations were decreased, 20alpha-DH-progesterone increased and the progesterone/20alpha-DH-progesterone ratio decreased threefold (p<0.001). Thus, CYP27A1 modulates progesterone concentrations. The underlying mechanism is inhibition of 20alpha-hydroxysteroid dehydrogenase by 27-hydroxycholesterol. Key words: Progesterone, sterol 27-hydroxylase, 27-hydroxycholesterol, 20a-steroid dehydrogenase, 20a-DH-progesterone.

Development of light-responsive porous polycarbonate membranes for controlled caffeine delivery

For controlled caffeine release, light-responsive membranes were developed. It was possible to produce membranes that reduced their caffeine permeability resistance by about 97% when irradiated with UV-light compared to measurements at daylight. This was achieved by grafting polymers possessing photochromic units onto track-edged polycarbonate membranes. Covalently linked coatings on porous polycarbonate membranes were obtained by plasma activation of the membrane surface followed by plasma-induced graft polymerization. Copolymerization of spiro-compounds during the coating process as well as postmodification of preformed coatings with spiropyran resulted in photochromic membranes. For the copolymerization process, the synthesis of five photochromic methacrylic and acrylic spiropyrans and spirooxazines was successfully performed. Additionally, a spiropyran with carboxylic acid functionality was synthesized for the postmodification process. This enabled us to postmodify polymeric materials containing alcohol or amine groups to obtain photochromic materials. UV-irradiation of these light-responsive membranes resulted in a strong colouration of the membrane, in a reduction of surface tension, which resulted in a decreased caffeine permeability resistance. The membranes were characterized using XPS for the elemental composition of the coating, contact angle measurements for the surface tension, solid-state UV/VIS measurements for the determination of the kinetic and stability properties, and two-photon microscopy for the localisation of the photochromic substance in the porous membrane.