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In cats anesthetized with alpha-chloralose, extracellular recordings were made from fine afferent units belonging to the medial articular nerve (MAN) of the knee joint. The excitatory and sensitizing effects on articular afferents of serotonin (5-HT) applied intra-arterially close to the joint were examined. The joints were either normal or an experimental arthritis had been induced some hours before the recording session. Bolus injections of 1.35-135 p,g 5-HT excited about 43% of group 111 (CV: 2.5-20 m/sec) and 73% of group IV units (CV: < 2.5 mjsec) from normal joints. The latency was usually between 10 and 30 sec, and the duration and size of the responses were dose-dependent. Fast group 111 units (CV: > 16 mjsec) and group li units (CV: > 20 m/sec) were never excited by 5-HT. Repetitiveadministration led to pronounced tachyphylaxis of the 5-HT response. Inflammation induced an enhanced sensitivity of group III articular afferent units to close intra-arterial application of 5-HT. In particular the total duration of each response was considerably prolonged (4-10 min against 1-2 min under normal conditions). At the same time the tachyphylaxis seen under normal conditions was gteatly reduced. In contrast, group IV articular afferent units did not become sensitized to 5-HT in the course of inflammation. In normal joints 5-HT did not sensitize fineafferent units for movement-induced responses. However, after inflammation, a distinct sensitization to such movements by 5-HT application could be observed bothin group 111 and group IV fiber ranges. The sensitization had a short time course not exceeding 7 min. The tonic component of the movement-induced response was more enhanced than the phasic one. The bolus application of 5-HT led to temporary vasoconstriction of the knee joint vessels. This vasoconstriction was especially pronounced in inflamed joints and impeded the access of subsequently applied substances to the terminal regions of the afferent units under observation. lt is concluded that the present results support the notion that 5-HT may participate in the mediation of pain from inflamed tissue such as an arthritic joint by exciting and sensitizing fine afferent units. During inflammation group 111 units are particularly sensitive to 5-HT and, thus, may carry the bulk of the 5-HT-induced nociceptive messages.
The total nerve cell numbers in the right and in the left human entorhinal areas have been calculated by volume estimations with the Cavalieri principle and by cell density determinations with the optical disector. Thick gallocyanin-stained serial frozen sections through the parahippocampal gyrus of 22 human subjects (10 female, 12 male) ranging from 18 to 86 years were analysed. The laminar composition of gallocyanin (Nissl)-stained sections could easily be compared with Braak's (1972, 1980) pigmentoarchitectonic study, and Braak's nomenclature of the entorhinal laminas was adopted. Cellsparse laminae dissecantes can more clearly be distinguished in Nissl than in aldehydefuchsin preparations. These cell-poor dissecantes, lamina dissecans extema (dis-ext), lamina dissecans 1 (dis-1) and lamina dissecans 2 (dis-2), were excluded from nerve cell nurober determinations. An exact delineation of the entorhinal area is indispensable for any kind of quantitative investigation. We have defined the entorhinal area by the presence of pre-alpha ceil clusters and the deeper layers of lamina principalis externa (pre-beta and gamma) separated from lamina principalis interna (pri) by lamina dissecans 1 (dis-1). The human entorhinal area is quantitatively characterized by a left-sided (asymmetric) higher pre-alpha cell number and an age-related nerve cell loss in pre as well as pri layers. At variance with other CNS cortical and subcortical structures, the neuronal number of the entorhinal area appears to decrease continuously from the earliest stages analysed, although a secular trend has to be considered. The asymmetry in pre-alpha cell number is discussed in the context of higher human mental capabilities, especially language.
Ultrastructural changes including reduced electron density, reduction in polysemes and cisternae of rough endoplasmic reticulum occur in the cytoplasrn of endothelial cells and pericytes in the cerebellar cortex of senile virgin female Han: WIST-rats in cornparison to 3-month old virgin rats. Processes of pericytes cover less of the capillary surface in the cerebellar cortex of senile rats; moreover, arithmetic and harmonic mean thickness of the endothelium and relative volume of mitochondria in endothelial cells and pericytes are reduced, w hereas the luminal diameter of the capillaries, harmonic and arithmetic mean thickness of pericytes and their processes and of the basal laminae between endothelial cells and astrocytes (abbreviated BAL 1), pericytes and astrocytes (BAL 2) and endothelial cells and pericytes (BAL 3) increase. The increase in harmonic mean thickness of the basal laminae is statistically significant (α<=0.05) and compensates for a decrease in thickness of capillary endothelium. Consequently, the total barrier mass and thickness of cerebellar cortical capillaries in senile animals is higher than in young individuals.
The distribution of lipofuscin in the perikarya of Purkin je cells of vermal and hemispheric lobules has been determined quantitatively in 7 rats, 30-38 months old, by the point-counting method. On the basis of morphologically and statistically significant differences a pigmentarchitectonics of the cerebellar cortex is established. The Purkinje cells of lobule VIa (Larsell 1952) are extremely lipofuscin-rich. The Purkinje cells of the hemispheres, lobules V, Vlb + c and VII contain considerable amounts of a finely granular lipofuscin, the Purkinje cells of lobules I-III and VIII- IXa a globular type of lipofuscin. The Purkinje cells of sublobule XI d c and X are lipofuscin-poor cells. Three types of lipofuscin ha ve been identified in the light microscope.
The ultrastructure of autofluorescent, PAS-positive lipofuscin in Purkinje, granule, Golgi epithelial, basket and stellate, microglial and perivascular cells in the cerebellar cortex of senescent rats is described. The membrane- bounded pigment is composed ofthree elements: 1) electron-lucent homogeneaus droplets, 2) a granular matrix and 3) intensely osmiophilic patches. The proportians ofthese three components vary between cell types and one can grossly differentiate a neuronal and a gliallipofuscin. The lipofuscin granules of stellate and perivscular cells are different from lipofuscin of other cerebellar neurons and glia. lt can be concluded from these morphological observations that each cerebellar cell type has its distinct lipofuscin.
Quantitative anatomical studies on the postnatal development of the cerebellum of the albino rat
(1977)
The quantitative postnatal changes of the cerebella of 65 Wistar rats aged 2-120 days have been examined. The cerebellar volume increases in two phases: The first phase lasts from birth to the seventh postnatal week. The second phase begins ten weeks post parturn and lasts for a Ionger period than the first phase. The cerebellar surface increases continuously from birth to the end of the seventh week. The volume of the external granular layer is maximal when the organ grows rapidly. The external granular layer has nearly disappeared 24 days after birth; the volume of the interaal granular layer is maximal at this time. Later on, the volume and the width of the interaal granular layer decrease. Myelinization of the cerebellar fibers and growth of the molecular layer run parallel to this decrease. The second late, but protracted growth of the cerebellum, ten weeks after birth, is due to an increase of the molecular and medullary layer. These findings are in good accord with histological, histochemical, and ultrastructural observations of other authors.
Ernährung und Krebs
(1985)
No abstract available
The total cortical and striatal neurone and glial numbers were estimated in five cases of Huntington's disease (three males, two females) and five ageand sex-matched control cases. Serial 500-l-lm-thick gallocyanin-stained frontal sections through the left hemisphere were analysed using Cavalieri's principle for volume and the optical disector for cell density estimations. The average cortical neurone number of five controls (mean age 53±13 years, range 36-72 years) was 5.97x 109±320x 106 , the average number of small striatal neurones was 82 X 106± 15.8 X 106• The left striatum (caudatum, putamen, and accumbens) contained a mean of 273 X 106±53 X 106 glial cells (oligodendrocytes, astrocytes and unc1assifiable glial profiles). The mean cortical neurone number in Huntington's disease patients (mean age 49±14 years, range 36-75 years) was diminished by about 33 % to 3.99x109±218x106 nerve cells (P ::;:::: 0.012, MannWhitney V-test). The mean number of small striatal neurones decreased tremendously to 9.72 X 106 ± 3.64 X 106 (-88 % ). The decrease in total glial cells was less pronounced (193 X 106±26 X 106) but the mean glial index, the numerical ratio of glial cells per neurone, increased from 3.35 to 22.59 in Huntington's disease. Qualitatively, neuronal loss was most pronounced in supragranular layers of primary sensory areas (Brodmann's areae 3,1,2; area 17, area 41). Layer HIc pyramidal cells were preferentially lost in association areas of the temporal, frontal, and parietal lobes, whereas spared layer IV granule cells formed a conspicuous band between layer IH and V in these fields. Methodological issues are discussed in context with previous investigations and similarities and differences of laminar and lobar nerve cellloss in Huntington's disease are compared with nerve cell degent-ration in other neuropsychiatric diseases.
Prostaglandin D2 (PGD2) is the most common prostaglandin type of tile rat brain. Recently a neurornodulator role for PGD2 has been suggested. In the present work the central cardiovascular and thermal effects of PGDz were studied in urethane-anaesthetised rats. Mlen adrndnistered at the doses of 0.001-10 ~g/rat into the lateral cerebral ventricle(i.c.v.), PGD2 slightly increased the blood pressure, heart rate and body ternpera~ ure. The highest dose caused also an initial hypotensive effect. Upon lntravenous injections PGD2 (0.1-10 ~g/rat) initially decreased and then weakly increased the blood pressure but had only negligible effects on heart rate and body temperature. Central pretreatment with sodium meclofenamate or indomethacin (1 mg/rat i.c.v.) antagonised effectively all the recorded central effects of PGD2. The central cardiovascular and thermal effects of PGD2 were much weaker than those obtained earlier with other prostaglandins, such as PGF2alpha and PGE2.. Therefore, in spite of its abundance in the brain PGD2 may not be very important for the central cardiovascular and thermal regulation in the rat.
In addition to the endocrine effects, the thyrotropin releasing hormone (TRH) is known to induce dose-dependent increases in blood pressure and heart rate after intracerebroventricular (i.c.v.) administration in urethane-anaesthetised rats (1, 2). The a~ of the present study was to investigate whether TRH has similar effects in conscious rats of various strains i.e. spontaneously hypertensive rats (SHR), normotensive Wistar-Kyoto (WKY) and Wistar (NR) rats.
Thromboxanes are abundantly present in the rat brain but their possible physiological functions in the brain are not known. The prostaglandin endoperoxide analogue U-46619 is a selective agonist of TxA2 receptors in many peripheral tissues. In the present study the ·central cardiovascular and ventilatory effects of U-46619 were investigated in rats. In conscious spontaneously hypertensive rats (SHR) U-46619 (1-100 nmol/kg i.c.v.) induced a strong dose-related increase in blood pressure but had no significant effect on heart rate. In conscious normotensive rats (NR) neither blood pressure nor heart rate was significantly affected. Furthermore, U-46619 (0.1-100 nmol/kg i.c.v.) had no significant effect on blood pressure, heart rate or ventilation in urethane-anaesthetised NR . The results demonstrate an increased sensitivity of SHR to TxA2.
The endogenous opioid system has been reported to depress the cardiovascular system during shock states, since naloxone, a potent opiate antagonist, enhances recovery of hemodynamic variables in various shock states. However, the effect of naloxone on long-term survival of experimental animals exposed to hypovolemic hypotension is not clear. The present studies tested the capacity of various doses of naloxone to protect conscious rats from mortality following various bleeding paradigms. In addition, the effect of morphine on survival of rats exposed to hemorrhage was also examined. In the six different experimental protocols tested, naloxone treatments failed to improve short- or long-term survival; in fact, naloxone treatment reduced short-term survival in two of the experimental protocols. Morphine injection, however, enhanced the mortality of rats exposed to hemorrhage in a dose-dependent manner. It is concluded that while opiates administered exogenously decrease survival after acute bleeding, naloxone has no protective action in such states and, like morphine, it may decrease survival in some situations.
Thyrotropin releasing hormone (TRH, I-pyroglutamyl-l-histidyl-l-prolinamide) was the fIrst hypothalamic releasing SUbstance to be isolated, chemically characterized and synthetized /1/. The studies to date have revealed that the thyrotropin release from the pituitary gland is only one of the numerous actions of TRH. In addition to its endocrine actions (TSH and prolactin release) this tripeptide has central nervous system actions totally unrelated to its effects on the hypothalamo-pituitary axis. This review aims to summarize the studies on the central nervous system' actions of TRH with special emphasis on the autonomic pharmacology of this peptide.
Enkephalins and their receptors are found in neurons and nerve terminals known to be involved in central cardiovascular control as well as the peripheral sympathetic and parasympathetic systems. Enkephalins and opioid receptors were also iden tified in the heart, kidneys, and blood vessels. The enkephalins interact with several specific receptors, of which p, 0, and K have been best characterized. Enkephalins administered to humans or animals produce cardiovascular effects which depend on the spedes, route of administration, anesthesia, and the selectivity for receptor subtype. While little information exists on the role of enkephalins in normal cardiovascular control, current data suggest that enkephalins might have a role in cardiovascular stress responses such os in shock and trauma.
The endogenous opioid system includes three major families of peptides: dynorphins (derived from pre-proenkephalin B), endorphins (derived from pre-proopiomelanocortin), and enkephalins (derived from pre-proenkephalin A). Multiple species of opioid peptides are derived from these major precursors and many of them possess potent cardiovascular properties. Opioid peptides and opioid receptors, of which multiple forms have been defined, are present in the central nervous system and peripheral neural elements. In the central nervous system, opioid peptides and receptors are found in forebrain and hindbrain nuclei involved in baroregulation, sympathoadrenal activation, and several other vital autonomic functions. In the periphery, opioid peptides are found in autonomic ganglia, adrenal gland, heart, and other organs; multiple opioid receptors are also found in vascular tissue, heart, and kidneys. Although little is known to date on the regulatory mechanisms of the opioid system in normal cardiovascular states, it became clear that cardiovascular stress situations substantially modify the activity of the endogenous opioid system. The purpose of this review is to clarify the sites of interaction of the opioid system with all major components of the cardiovascular system and indicate the potential role of this system in the ontogenesis of cardiac malfunction, vascular diseases, and hypertension.
We have previously reported that analgesic doses of morphine accelerate mortality of rats exposed to hemorrhage (Feuerstein and Siren: Circ Shock 19:293-300, 1986). To study the potential mechanisms involved in this phenomenon, rats were chronically implanted with catheters in the femoral vessels and morphine (1.5 or 5 mg/kg) was administered 30 min or 24 hr after bleeding (8.5 mll300 g over 5 min) while arterial blood pressure and heart rate were continuously monitored. Furthermore, the effect of morphine (5 mg/kg) on cardiac output (CO) response to hemorrhage was studied in rats chronically equipped with a mini thermistor for CO monitoring by a thermodilution technique. In addition, plasma catecholamines (HPLC), plasma renin activity (PRA, RIA), vasopressin (RIA), pH, and blood gases were also determined. Morphine administration 30 min after hemorrhage produced a pressor response and tachycardia which were in marked contrast to its depressor effect in intact rats. Morphine elevated PRA and epinephrine but not vasopressin, while blood pH and gases showed no consistent change as compared to salinetreated hemorrhaged rats. Morphine given after the bleeding resulted in enhanced cardiac depression in response to a second bleed of 2 m1l300 g. Our data suggest that activation of pressor mechanisms by morphine during hypovolemic hypotension might enhance vasoconstriction in essential organs, depress cardiac function, and further reduce effective tissue perfusion.
Nach der vorliegenden Untersuchung zum Outsourcing medizinischer Daten aus strafrechtlicher Sicht kann folgendes Gesamtergebnis festgehalten werden. Beim Outsourcing medizinischer Daten sind regelmäßig personenbezogene Informationen betroffen. Personenbezogene Information umfasst als Oberbegriff „Geheimnisse“ i.S.v. § 203 StGB sowie personenbezogene Daten im Sinne des Datenschutzrechts. Bei der Bestimmung des Personenbezuges ist es trotz der grundsätzlichen Parallelgeltung von Datenschutzrecht und § 203 StGB zulässig, auf Grundsätze aus dem Datenschutzrecht zurückzugreifen. Für den Outsourcer medizinischer Daten droht eine Strafbarkeit nach § 203 StGB, wenn private IT-Dienstleistungsunternehmen vom schweigepflichtigen Outsourcer zur Erledigung von Aufgaben herangezogen werden und in Kontakt mit den Geheimnissen geraten. Daneben kann sich eine Strafbarkeit im Wege der Teilnahme an einer nach § 203 StGB strafbaren Geheimnisverletzung ergeben. Bei Sachverhalten mit Auslandsbezug kann es dabei zu einer Anwendung deutschen Strafrechts kommen, wenn die Teilnahmehandlung im Inland sich auf ein im Ausland erfolgendes Outsourcing bezieht oder die Teilnahmehandlung im Ausland sich auf ein im Inland erfolgendes Outsourcing bezieht. Bei § 85a SGB X und § 44 BDSG können sich ausländische Outsourcingpartner auch als Mittäter strafbar machen, da es sich bei diesen Delikten nicht um Sonderdelikte handelt. Allerdings lässt sich durch eine entsprechende Gestaltung des Outsourcingvorhabens im Einzelfall, unabhängig davon, ob ein Schweigepflichtiger nach § 203 Abs. 1 oder Abs. 2 StGB betroffen ist, eine Strafbarkeit vermeiden. Ansatz ist dabei die Tatbestandsebene des § 203 StGB, nämlich das Merkmal „Geheimnis“ sowie das Merkmal „Offenbaren“. So kann einerseits durch eine wirksame Verschlüsselung ein „Geheimnis“ i.S.v. § 203 StGB entfallen. Andererseits besteht die Möglichkeit, Mitarbeiter des privaten externen Dienstleistungsunternehmens als Gehilfen in den Kreis der zum Wissen Berufenen zu integrieren. Hierzu muss der Dritte an die Funktion des Schweigepflichtigen so angebunden werden, dass aus objektiv-normativer Sicht von einer tatbestandlichen Verantwortungseinheit gesprochen werden kann. Auf der Ebene der Rechtswidrigkeit lässt sich der Gefahr einer Strafbarkeit nach § 203 StGB durch eine Einwilligung begegnen. Außerhalb des Rechtfertigungsgrundes der Einwilligung bestehen für das Outsourcing von medizinischen Daten regelmäßig keine strafrechtlichen Erlaubnissätze. Allenfalls in unvorhergesehenen Ausnahmesituationen ist eine Rechtfertigung nach § 34 StGB denkbar. Für den Regelfall des Outsourcings ist § 34 StGB nicht als Rechtfertigungsgrund tauglich. Neben einer Strafbarkeit nach § 203 StGB kommt beim Outsourcing medizinischer Daten eine Strafbarkeit nach § 44 BDSG bzw. nach entsprechenden Vorschriften der Landesdatenschutzgesetze sowie eine Strafbarkeit nach § 85a SGB X in Betracht. Die Gefahr einer Strafbarkeit kann ausgeschlossen werden, wenn das Outsourcing datenschutzrechtlich bzw. sozialrechtlich zulässig ist. Neben der Möglichkeit einer Einwilligung, die nur ausdrücklich erfolgen kann, ist die Zulässigkeit eines Outsourcings medizinischer Daten über eine Ausgestaltung als Auftragsdatenverarbeitung erreichbar. Vorschriften zur Auftragsdatenverarbeitung existieren sowohl im Datenschutzrecht als auch im Sozialrecht. Diese Vorschriften ermöglichen, sofern nicht spezielle Vorschriften des sektorspezifischen Datenschutzrechts wie beispielsweise Art. 27 Bayerisches Krankenhausgesetz entgegenstehen, in bestimmten Grenzen ein Outsourcing medizinischer Daten unter Beteiligung privater IT-Dienstleistungsunternehmen. Die Normen der Auftragsdatenverarbeitung ermöglichen nicht eine selbständige und eigenverantwortliche Aufgabenerfüllung durch den Outsourcingnehmer im Sinne einer Funktionsübertragung. Vielmehr muss der Outsourcer nach einer Gesamtbetrachtung das Gesamtgeschehen erkennbar beherrschen und steuern. Die Aufgabe darf nicht durch den Auftraggeber insgesamt aus den Händen gegeben werden. Andere Vorschriften, die eine Funktionsübertragung beim Outsourcing medizinischer Daten ermöglichen würden, bestehen nicht. Die straflose Möglichkeit des Outsourcings medizinischer Daten hängt von der Gestaltung im Einzelfall ab. Dies kann unter dem Aspekt der Rechtssicherheit und Rechtsklarheit beklagt werden. Wünschenswert ist eine bundeseinheitliche Regelung, die das Outsourcing strafrechtlich regelt. Unter den verschiedenen gesetzgeberischen Möglichkeiten ist eine Neuregelung des § 203 StGB zu favorisieren.
Diagnostic Case Based Training Systems (D-CBT) provide learners with a means to learn and exercise knowledge in a realistic context. In medical education, D-CBT Systems present virtual patients to the learners who are asked to examine, diagnose and state therapies for these patients. Due a number of conflicting and changing requirements, e.g. time for learning, authoring effort, several systems were developed so far. These systems range from simple, easy-to-use presentation systems to highly complex knowledge based systems supporting explorative learning. This thesis presents an approach and tools to create D-CBT systems from existing sources (documents, e.g. dismissal records) using existing tools (word processors): Authors annotate and extend the documents to model the knowledge. A scalable knowledge representation is able to capture the content on multiple levels, from simple to highly structured knowledge. Thus, authoring of D-CBT systems requires less prerequisites and pre-knowledge and is faster than approaches using specialized authoring environments. Also, authors can iteratively add and structure more knowledge to adapt training cases to their learners needs. The theses also discusses the application of the same approach to other domains, especially to knowledge acquisition for the Semantic Web.
Die Arznei- und Kräuterbücher des Mittelalters enthalten eine große Zahl frauenheilkundlicher Rezepte. Da die Rezepte jedoch unsystematisch und weit verstreut vorliegen, konnten bislang nur bedingt qualifizierte Schlußfolgerungen - etwa über die Häufigkeit bestimmter Indikationen - gezogen werden. Die Verfasserin hat aus einem repräsentativen Querschnitt von 27 als Edition vorliegenden Arznei- und Kräuterbüchern rund 900 Rezepte quantitativ und qualitativ ausgewertet. Dabei wurde u.a. nach der Häufigkeit der einzelnen Indikationen, Anwendungen und Heilmitteln, nach der Wirksamkeit der empfohlenen Behandlungen, nach der Rolle der Patientin sowie nach überlieferungsgeschichtlichen Entwicklungen gefragt. Einige der interessantesten Ergebnisse: Die blutungsfördernden (emmenagogen) Rezepte stellen mit Abstand die größte Indikationsgruppe dar, wobei oft klar zwischen solchen Rezepten unterschieden wird, die eine Blutung zum Zwecke der Gebärmutterreinigung auslösen und solchen, die eine Menstruationsblutung herbeiführen wollen. Aus pharmakologischer Sicht ist die Grenze zwischen menstruationsfördernden und abortiven Rezepten fließend. Die Auswertung ihrer Wirksamkeit und ihres Kontextes zeigt, daß bei mehr als 10% der untersuchten Rezepte Kenntnisse über Abortivmittel und ihrer Anwendungen sicher vorausgesetzt werden können. Unter den treibenden Rezepten fand sich der größte Anteil an Verordnungen, die aus heutiger Sicht medizinisch wirksam sind. Bei den Gebärmutter- und Brusterkrankungen dagegen zeigt sich große Ratlosigkeit in Diagnose und Behandlung. Ein wichtiges Ergebnis ist die im Rahmen der Untersuchung aufgebaute Datenbank. Sie ist in Form zweier Tabellen abgebildet. Außerdem ist jedes Rezept im Wortlaut abgedruckt und mit einem Kommentar zu Indikation, Inhaltsstoffen, Anwendung, Parallelüberlieferungen und Besonderheiten versehen. Man kann nun frauenheilkundliche Rezepte nicht edierter Handschriften oder noch nicht ausgewerteter Editionen mit dem umfangreichen Datenbestand vergleichen, ohne sich durch Hunderte von Textseiten arbeiten zu müssen. Die Datenbank soll weiter ausgebaut und - sofern sich die nötige Unterstützung dazu findet - auch elektronisch zugänglich gemacht werden.