Botanical Investigations in Southwest Greenland, 1946

Contains brief account of a four-man Danish expedition into the regions of Arsuk Fjord, Godthaab, and Sondre Stromfjord, collecting various groups of land and fresh-water plants and studying ecological conditions. Bibliography (7 items)

The allotetraploid Saxifraga nathorsti and its probable progenitors S. aizoides and S. oppositifolia

Saxifraga nathorsti is an endemic Greenland species geographically restricted to Northeast Greenland. Morphologically it is intermediate between Saxifraga oppositifolia with purplish petals and S. aizoides with yellow petals. A hybrid between these two species is difficult to obtain and is not known from Greenland or anywhere else. New material from Northeast Greenland has been cultivated and studied cytologically. One strain of typical S. nathorsti corresponded to the material studied previously. It also had 52 chromosomes and showed a high degree of pairing during meiosis. It was fertile, but exhibited several meiotic irregularities. Another strain seemed morphologically more closely related to S. oppositifolia. It was sterile and had the triploid number 2n = 39. It was assumed to have two genomes from S. oppositifolia and one from S. aizoides. It appears most probable that triploids of this kind after fertilization with pollen from S. aizoides can give rise to S. nathorsti. Anatomical studies of the structure of epithem hydathodes in S. nathorsti and its two possible ancestors, S. oppositifolia and S. aizoides, show that S. nathorsti in several important hydathode characters occupies an intermediate position between S. oppositifolia and S. aizoides. Thus, all available facts support the theory of the origin and stabilization of S. nathorsti as an allotetraploid species

Forest-Tundra Neighbouring the North Pole: Plant and Insect Remains from the Plio-Pleistocene Kap København Formation, North Greenland

The Kap Kobenhavn Formation in northeast Peary Land, Greenland, is believed to be 2.0-2.5 million years old, i.e., from the Plio-Pleistocene transition. The dating is primarily based on biostratigraphical correlation of lower marine fauna and a few fragments of terrestrial mammals. Although deposited in marine and coastal environments, the sediments contain abundant remains of terrestrial and limnic organisms. This paper examines macroscopic plant and insect remains. About 60 taxa of vascular plants and 120 insect taxa have so far been identified. Nearly all of the named insect species are extant, extralimital forms, generally of a recent subarctic/boreal and more or less circumpolar distribution. The species composition shows that upland areas were covered with forest-tundra and heathland and that mesotrophic, well-vegetated lakes and a number of other wetland localties existed in the area. The presence of arctic plants in the formation puts some time constraints on their origin.

Extending Romanovski polynomials in quantum mechanics

Some extensions of the (third-class) Romanovski polynomials (also called Romanovski/pseudo-Jacobi polynomials), which appear in bound-state wavefunctions of rationally-extended Scarf II and Rosen-Morse I potentials, are considered. For the former potentials, the generalized polynomials satisfy a finite orthogonality relation, while for the latter an infinite set of relations among polynomials with degree-dependent parameters is obtained. Both types of relations are counterparts of those known for conventional polynomials. In the absence of any direct information on the zeros of the Romanovski polynomials present in denominators, the regularity of the constructed potentials is checked by taking advantage of the disconjugacy properties of second-order differential equations of Schr\"odinger type. It is also shown that on going from Scarf I to Scarf II or from Rosen-Morse II to Rosen-Morse I potentials, the variety of rational extensions is narrowed down from types I, II, and III to type III only.Comment: 25 pages, no figure, small changes, 3 additional references, published versio

Phosphor-induzierte Kieferknochennekrose, eine "alte" aktuelle Berufserkrankung

Vor dem Hintergrund der kürzlich publizierten Fälle von Kieferknochennekrose in Verbindung mit einer Bisphosphonat-Therapie (sehr häufig angewandte medikamentöse Therapieform bei Osteoporose und in der Onkologie) soll ein historischer und medizinischer Überblick über die "alte" Berufserkrankung "Kieferknochennekrose durch Phosphor" gegeben werden. Die klinische Ausprägung der Berufserkrankung Phosphor-Kieferknochennekrose ähnelt dem Bild der Kieferknochennekrosen, die präsumptiv im Rahmen der Bisphosphonat-Therapie entstanden sind. Da diese Berufserkrankung in den letzten Jahrzehnten infolge industrieller Umstellungen selten geworden ist — lt. Auskunft des HVBG im Zeitraum 1998 bis 2002 keine Anzeige von Kieferknochennekrosen (BKZiffer 1109) —, soll hier ein Review zur Wissensauffrischung erfolgen. Vielleicht kann das arbeitsmedizinische Wissen zur Klärung dieser neu beobachteten Krankheitsentität in Verbindung mit Bisphosphonaten beitragen. Die ersten Beobachtungen einer Kieferknochennekrose bei Arbeitern in der Zündholzindustrie stammen aus den Jahren 1839 und 1843, die erste Publikation erfolgte in 1844, der ursächliche Zusammenhang wurde 1845 erkannt. Die phosphorinduzierte Kieferknochennekrose entsteht infolge Endothelschädigungen durch elementaren Phosphor. Gerade im Kieferknochenbereich können Bakterien via Zahnpathologien und anderen Umständen leicht in die ossären Strukturen vordringen, so dass schließlich eine Periostitis oder gar Osteomyelitis resultieren kann. Folgende Punkte werden behandelt: chemische Charakterisierung des Phosphor, historischer Abriss der Berufserkrankung Kieferknochennekrose, aktuelle Expositionsmöglichkeiten, Wirkungen des Phosphor, das klinische Bild der Kieferknochennekrose, Therapie und Prophylaxe

Regional Governance und Großschutzgebiete

Der Beitrag verortet die Diskussion um Regionalentwicklung in Großschutzgebieten in der politikwissenschaftlichen Diskussion um Governance und Regional Governance. Ziel des Beitrages ist es aufzuzeigen, dass es drei Hauptgründe gibt, warum Governance eine Rolle für Großschutzgebiete spielt: 1. aufgrund eines veränderten Naturschutzverständnisses, 2. aufgrund einer Bedeutungszunahme von Konzepten naturschutzorientierter Regionalentwicklung und 3. aufgrund der zwangsläufigen Umsetzung von Großschutzgebieten im politischen Mehrebenensystem. Empirisch sollen diese Governance-Aspekte anhand des Bundeswettbewerbes "idee.natur" illustriert werden. Deutlich werden soll, dass Governance und Regional Governance wichtige Anknüpfungspunkte für Naturschutz und Großschutzgebiete bieten und es solche Konzeptionen mittlerweile tatsächlich in der naturschutzpolitischen Praxis gibt.The paper locates the debate on regional development in large-scale protected areas in the political-science discussion on governance and regional governance. The aim is to demonstrate that there are three primary reasons why governance is of relevance for large-scale protected areas: 1. due to a changed understanding of nature protection, 2. due to the increased significance of regional development concepts oriented towards nature protection, and 3. due to the necessity of implementing large-scale protected areas in a multi-level political system. These aspects of governance are empirically illustrated using the example of the federal competition ‘idee.natur’. It becomes clear that governance and regional governance are important approaches for nature conservation and large-scale protected areas and that such concepts are already in use in the policy practice of nature protection

Phossy jaws : an old occupational disease - up to date?

Recently a few reports of osteonecrosis of the jaws associated with a bisphosphonate therapy were published. There seemed to be some clinical commonalities with the old occupational disease "phossy jaws\u27;. We give an historical and medical overview of "phossy jaws\u27;. Because of many industrial changes that old disease has become rare; in Germany there are no cases reported in the years 1998 until 2002 — according to the German Hauptverband der gewerblichen Berufsgenossenschaften. Maybe the old knowledge about phossy jaws is able to clear up some secrets of the new drug-associated phenomenon. First observations of phossy jaws date back to the years 1839 and 1843, they are seen with workers in match stick factories. The causality between phosphorus and phossy jaws was re-cognized in 1845. Phossy jaws are a consequence of endothelium-damage by elemental phosphorus inhaled when working with it. Especially the jaws are exposed to a number of foreign substances, i.e. bacteria by tooth decay or other circumstances. Thus — decreased blood flow and bacteria lead to an Osteomyelitis, so called phossy jaws