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Institute
- Institut für Physik und Astronomie (435)
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A necessary adjustment of protocol for use of DPC Coat-a-Count Total Testosterone assay with saliva
(1999)
Chromosomal assignment of the human gene for endosarcomeric cytoskeletal M-protein (MYOM2) to 8p23.3
(1999)
If an atom is able to exhibit macroscopic dark periods, or electron shelving, then a driven system of tow atoms has three types of these fluorescence types as a simple and easily accessible indivator of cooperative effects. As an examble, we study two dipole-interacting V systems by simulation techniques. We show that the durations of the two types of light periods exhibit marked sepatation-dependent oscillations and that they vary in phase with the real part of the dipole-dipole coupling constant.
Effect of parturition on levels of vitamins A and E and of ß-carotene in plasma and milk of mares
(1999)
In this brochure, Tristram argues that Standard English may be more indebted to the influence of 'Late British' than hitherto acknowledged by mainstream historical scholarship. By 'Late British' the native (or source) language of the about 2m language shifters in the wake of the Anglo-Saxon Conquest is meant who constituted the bulk of the native population of the island of Britain in the early middle ages. Although predictably, the influence of 'Late British' on Old English neither shows in the lexis of written Old English nor in its core grammar, it does show in the phonology (Peter Schrijver) and the inflectional syncretism of the Northern dialect texts. The influence of the interlanguage of the shifters only really surfaces in Middle English texts, after the diglossia between the language of the HIGH variety of Old English of the ruling elite and the LOW variety of the working population was discontinued under Norman rule. A number of grammatical features are listed in this brochure, which show that Present Day Standard English typologically sides with the Celtic languages, and with the Neo-Brittonic languages in particular, rather than with the other Continental Germanic languages. The brochure also calls for more research into this matter and in particular detailed investigations into the individual features mentioned.
The human p53 gene mutated at position 249 per se is not sufficient to immortalize human liver cells
(1999)
Unmixing hyperspectral data
(2000)
The growth rates of heterotrophic nanoflagellates (HNAN), mixotrophic cryptophytes, dinoflagellates and ciliates in field assemblages from Ace Lake in the Vestfold Hills (eastern Antarctica) and Lakes Fryxell and Hoare (McMurdo Dry Valleys, western Antarctica), were determined during the austral summers of 1996/1997 and 1997/1998. The response of the nanoflagellates to temperature differed between lakes in eastern and western Antarctica. In Ace Lake the available bacterial food resources had little impact on growth rate, while temperature imposed an impact, whereas in Lake Hoare increased bacterial food resources elicited an increase in growth rate. However, the incorporation of published data from across Antarctica showed that temperature had the greater effect, but that growth is probably controlled by a suite of factors not solely related to bacterial food resources and temperature. Dinoflagellates had relatively high specific growth rates (0.0057-0.384 h(-1)), which were comparable to Antarctic lake ciliates and to dinoflagellates from warmer, lower latitude locations. Temperature did not appear to impose any significant impact on growth rates. Mixotrophic cryptophytes in Lake Hoare had lower specific growth rates than HNAN (0.0029-0.0059 h(-1) and 0.0056-0.0127 h(-1), respectively). They showed a marked seasonal variation in growth rate, which was probably related to photosynthetically active radiation under the ice at different depths in the water column. Ciliates' growth rates showed no relationship between food supply and mean cell volume, but did show a response to temperature. Specific growth rates ranged between 0.0033 and 0.150 h(-1) for heterotrophic ciliates, 0.0143 h(-1) for a mixotrophic Plagiocampa species and 0.0075 h(-1) for the entirely autotrophic ciliate, Mesodinium rubrum. The data indicated that the scope for growth among planktonic Protozoa living in oligotrophic, cold extreme lake ecosystems is limited. These organisms are likely to suffer prolonged physiological stress, which may account for the highly variable growth rates seen within and between Antarctic lakes.
Mixotrophy is a widespread phenomenon among planktonic protists. It involves the combination of autotrophy and heterotrophy in varying degrees. Many phytoflagellate species ingest bacteria as a means of obtaining nutrients for photosynthesis or for supplementing their carbon budget under light limitation. Ciliates either sequester the plastids of their algal prey or harbour endosymbiotic algae. In the saline lakes of the Vestfold Hills and in Lakes Hoare and Fryxell in the McMurdo Dry Valleys the dominant phytoflagellates ingest bacteria, and there is evidence to suggest that during the winter months they lack chlorophyll and may become entirely heterotrophic. In Lake Fryxell phagotrophic pyhtoflagellates (cryptophytes) made a significant impact on bacterial production, removing up to 13% of the bacterial biomass day-1. These cryptophytes suffered predation from Plagiocampa (a ciliate), which appears to harbour them for a significant period before digesting them. We suspect that this may be equivalent to an intermediate stage in the evolution of mixotrophy. A significant number of the planktonic ciliates in Antarctic lakes were mixotrophic. The final evolutionary end point is the situation seen in Mesodinium rubrum, which now relies entirely on its cryptophycean endosymbiont and no longer ingests food. Mesodinium is the dominant ciliate in many of the saline lakes of the Vestfold Hills, which are of marine origin. It can reach abundances in excess of 60,000l-1 in Ace Lake, This ciliate is a ubiquitous member of the marine plankton worldwide and has successfully adapted to the lacustrine environment in Antarctica. The evidence suggests that among the survival strategies seen in Antarctic lake plankton, mixotrophy plays and important role among a number of the dominant protozoan species.
Improving the performance of doped p-conjugated polymers for use in organic light-emitting diodes
(2000)
Charisma und Vergemeinschaftung im George- und Horkheimer-Kreis : Gemeinsamkeiten und Gegensätze
(2001)
Natural selection for grazer resistance to toxic cyanobacteria: Evolution of phenotypic plasticity?
(2001)
We report on deep multi-color imaging (R5sigma = 26) of the Chandra Deep Field South, obtained with the Wide Field Imager (WFI) at the MPG/ESO 2.2 m telescope on La Silla as part of the multi-color survey COMBO-17. As a result we present a catalogue of 63 501 objects in a field measuring 31farcm5 x 30arcmin with astrometry and BVR photometry. A sample of 37 variable objects is selected from two-epoch photometry. We try to give interpretations based on color and variation amplitude.
First, we review the current status of the detection of strong `external' variability in the CLASS gravitational B1600+434, focusing on the 1998 VLA 8.5-GHz and 1998/9 WSRT multi-frequency observations. We show that this data can best be explained in terms of radio-microlensing. We then proceed to show some preliminary results from our new multi-frequency VLA monitoring program, in particular the detection of a strong feature (~30%) in the light curve of the lensed image which passes predominantly through the dark-matter halo of the lens galaxy. We tentatively interpret this event, which lasted for several weeks, as a radio-microlensing caustic crossing, i.e. the superluminal motion of a micro-arcsec-scale jet-component in the lensed source over a single caustic in the magnification pattern, that has been created by massive compact objects along the line-of-sight to the lensed image.
Andreas von Bülow
(2001)
Hans Leussink
(2001)
Klaus von Dohnanyi
(2001)
Breton and Irish, two Celtic and strongly endangered European minority languages, enjoy (or suffer) different fates of official recognition. While France does not officially recognise Breton as an independent language and has no even signed the European Charter of Minority Languages as most other EU countries did, Irish is by its constitution the first national language of the Republic of Ireland and therefore enjoys a very high official prestige. It is an obligatory subject in the schools and all EU documents need to be translated both into Irish and English. In spite of this difference of status and prestige, both languages have suffered, during the past 50 years, from a dramatic loss of speakers, as the young generation sees no need to preserve a regionalised minority heritage in a world of globalised communication and exchange. While both inherited languages were, traditionally and sociologically speaking, the medium of communication of the rural population, albeit with a long and venerable written tradition reaching back to the middle ages, the language of the future is that of the urban middle classes learnt as a second language (L2) und for all intents and purposes not used as a community language in the home. Middle class Breton and Irish are token languages, serving its users as identity markers in order to set themselves off from the English and French, most of whom only speak English and French and have no additional regional language. The linguistic gap between the inherited rural and the new urban varieties is great, so that older native rural speakers do not understand school Breton and school Irish. It is predictable that only the urban varieties will survive for still quite a while, whereas the rural varietes are unlikely to escape language death due to the ongoing change of living conditions in the rural areas and the absence of localised language engineering.
A simple way to prepare cucurbit[5]uril is described. The macrocycles of the cucurbituril type are nearly insoluble in water. The solubilities of cucurbit[5]uril, decamethylcucurbit[5]uril and cucurbit[6]uril in hydrochloric acid, formic acid and acetic acid of different concentrations have been investigated. Due to the formation of complexes between cucurbit[n]urils and protons the solubility increases in aqueous acids. The macrocyclic ligands are able to form complexes with several organic compounds. Thus, the complex formation of the cucurbituril macrocycles with different amines has beenstudied by means of calorimetric titrations. The reaction enthalpy gives noevidence of the formation of inclusion or exclusion complexes. 1H-NMR measurements show that in the case of cucurbit[5]uril and cucurbit[6]uril the organic guest compound is included within the hydrophobic cavity. Decamethylcucurbit[5]uril forms only exclusion complexes with organicamines. This was confirmed by the crystal structure of the decamethylcucurbit[5]uril-1,6- diaminohexane complex. complex formation - cucurbit[5]uril - cucurbit[6]uril - decamethylcucurbit[5]uril - solubility - synthesis
Spectral lines formed in stellar winds from OB stars are observed to exhibit profile variations. Discrete Absorption Components (DACs) show a remarkably slow wavelength drift with time. In a straightforward interpretation, this is in sharp contradiction to the steep velocity law predicted by the radiation-driven wind theory, and by semi- empirical profile fitting. In the present paper we re-discuss the interpretation of the drift rate. We show that the Co- rotating Interaction Region (CIR) model for the formation of DACs does not explain their slow drift rate as a consequence of rotation. On the contrary, the apparent acceleration of a spectral CIR feature is even higher than for the corresponding kinematical model without rotation. However, the observations can be understood by distinguishing between the velocity field of the matter flow, and the velocity law for the motion of the patterns in which the DAC features are formed. If the latter propagate upstream against the matter flow, the resulting wavelength drift mimics a much slower acceleration although the matter is moving fast. Additional to the DACs, a second type of recurrent structures is present in observed OB star spectra, the so-called modulations. In contrast to the DACs, these structures show a steep acceleration compatible with the theoretically predicted velocity law. We see only two possible consistent scenarios. Either, the wind is accelerated fast, and the modulations are formed in advected structures, while the DACs come from structures which are propagating upstream. Or, alternatively, steep and shallow velocity laws may co-exist at the same time in different spatial regions or directions of the wind.
Oligosaccharides composed of 2-acetamido-2-deoxy-D-glucopyranose (GlcNAc) and/or 2-amino-2-deoxy-D- glucopyranose (GlcN) were prepd. by chem. degrdn. of chitin or chitosan and sepd. by gel permeation chromatog. Oligosaccharides obtained after enzymic hydrolysis of chitosan [FA 0.19] with a fungal chitinase were derivatized by reductive amination with 2-aminoacridone and sequenced by matrix-assisted laser desorption ionization time-of-flight postsource decay (PSD) mass spectrometry (MS). The sequence of a trimer, D1A2, was established as D-A-A. The compn. of a hexamer D3A3 was .apprx.65% D-A-D-D-A-A and 35% D-D-A-D-A-A. The PSD MS of a nonamer D5A4-amac revealed four isobaric species D-X-Y-D-X-Y-D-A-A, where A is GlcNAc, D is GlcN, and X and Y (X ¹ Y) are mutually either D or A. This structure motif was also obsd. in a dodecamer D7A5 which was composed of eight isobaric sequences of the general formula (D-X-Y)3- D-A-A.
We present a data set of images of the gravitationally lensed quasar Q2237+0305, that was obtained at the Apache Point Observatory (APO) between June 1995 and January 1998. Although the images were taken under variable, often poor seeing conditions and with coarse pixel sampling, photometry is possible for the two brighter quasar images A and B with the help of exact quasar image positions from HST observations. We obtain a light curve with 73 data points for each of the images A and B. There is evidence for a long (ga 100 day) brightness peak in image A in 1996 with an amplitude of about 0.4 to 0.5 mag (relative to 1995), which indicates that microlensing has been taking place in the lensing galaxy. Image B does not vary much over the course of the observation period. The long, smooth variation of the light curve is similar to the results from the OGLE monitoring of the system (Wozniak et al. cite{Wozniak00}). Based on observations obtained with the Apache Point Observatory 3.5-meter telescope, which is owned and operated by the Astrophysical Research Consortium.
We present models for the complete life and death of a 60 Msolar star evolving in a close binary system, from the main-sequence phase to the formation of a compact remnant and fallback of supernova debris. After core hydrogen exhaustion, the star expands, loses most of its envelope by Roche lobe overflow, and becomes a Wolf-Rayet star. We study its post-mass transfer evolution as a function of the Wolf-Rayet wind mass-loss rate (which is currently not well constrained and will probably vary with the initial metallicity of the star). Varying this mass-loss rate by a factor of 6 leads to stellar masses at collapse that range from 3.1 up to 10.7 Msolar. Because of different carbon abundances left by core helium burning and nonmonotonic effects of the late shell-burning stages as function of the stellar mass, we find that, although the iron core masses at collapse are generally larger for stars with larger final masses, they do not depend monotonically on the final stellar mass or even the C/O core mass. We then compute the evolution of all models through collapse and bounce. The results range from strong supernova explosions (Ekin>1051ergs) for the lower final masses to the direct collapse of the star into a black hole for the largest final mass. Correspondingly, the final remnant masses, which were computed by following the supernova evolution and fallback of material for a timescale of about one year, are between 1.2 and 10 Msolar. We discuss the remaining uncertainties of this result and outline the consequences of our results for the understanding of the progenitor evolution of X-ray binaries and gamma-ray burst models.
We discuss the evolution of white dwarf containing binaries, in particular such systems consisting of a white dwarf and a main sequence star which have the potential to produce a Type Ia supernova. After investigating current problems in connecting observations of supersoft X-ray sources with such systems, we consider two major problems which theoretical models encounter to produce Chandrasekhar-mass white dwarfs: the helium shell burning instability and the white dwarf spin-up. We conclude by suggesting that the formation of Chandrasekhar-mass white dwarfs may be easier when these two problem are considered simultaneously.
Politische Bildung
(2002)
A close comparative analysis of the attrition of inflections in historical English and Welsh reveals that Welsh had already lost its entire NP inflection when it surfaces in writing in the 7c AD, while English was still fully inflected both in the NP and VP. The comparison of the modern English and Welsh morphological categories shows that English overtook Welsh in its rate of analyticising drift. This shows first in writing during the Middle English period. Thus in English, the attrition bothfully affected the NP and the VP, while in modern Welsh the attrition of the verbal inflection in the VP is much less advanced than in English. Both languages, however, share the shift in the VP from the synthetism of verbal tense, mood (and voice) marking towards analytic aspect marking, which continues to gain in importance in both languages today. The question is raised, whether this joint development may have been due to the influence of the 'Late British' speaking shifters to Old English, to prolongued areal contactin the island of Britain ("Sprachbund") and/or to a more general drift from syntheticity to analycity in (Western) IE languages in Europe, which affects some languages more than others. The Appendix prints the earliest Old English and Old Welsh texts (dated by absolute chronology) and marks their loss of inflections, in order to highlight the advanced analycity in the Old Welsh NP as opposed to the Old English NP.
The continued linguistic contact in the islands of Britain and Ireland over the past two millenia has led to linguistic convergence processes between the Insular Celtic and West Germanic languages involved. While the Latin, Old Norse and Norman French contact scenarios were recognised and have been well studied since the 19c, the Celtic component received much less scholarly attention until the 1990s because of the continued linguistic bias, once fostered by 19c Anglo-Saxonisms and the idea of racial purity of the Egnlish population. It is only in the very recent past that the many different contact areas between English and the Insular Celtic languages have received recognition after New Labour's post-1997 introduction of "devolution" politics. The closest and longest interaction took of course place between English and Welsh. The present article looks at three major types of interaction which led to convergence in a number of important linguistic features: (1) mutual retention of shared archaic features, (2) mutual shared innovations, and (3) transfer from one language to another, either by unilateral or by bilateral transfer. The exemplary contact features discussed in this article relate to the retention of interdental fricatives, the shared innovation of analycity and multi-word verb formation, and clefting as feature transfer. Transfer is likely to have taken place under the following conditions: (a) earlier written documentation in the donor language, (b) higher frequency of occurrence in the donor language, (c) conformity with other structures in the donor language, and (d) grammaticalisation in the donor language. The conclusion endorses Salikoko Mufwene's claim that the making of English in the island of Britain was subject to the same contact processes which created the English based creoles from indigenised Englishes during the colonial period.
DO-Periphrasis in Irish
(2002)
Periphrastic DO constructions are very common both in English and in the Neo-Brittonic languages and are used for various functional purposes. These form part of a larger linguistic area in western and northern Europe. The literature does not mention comparable constructions for Irish and Scottish Gaelic. Irish informants, however, confirm orally that they are in common use among present day Gaeltacht speakers. They appear also to have been common in late spoken Manx. This study is based on the "Caint Chonamara" electronic corpus, the field work for which was first untertaken by Hans Hartmann (Hamburg) and Tomás de Bhaldraithe (Dublin) in the early 1960s und brought to a close by Arndt Wigger (Wuppertal) in the 1990s. The file for the Ros Muc dialogues yielded a very low return of potential DO constructions, i.e. 14 tokens of DÉAN + VN out of 494 DÉAN tokens altogether in the file. This shows that the DÉAN + VN construction was grammatically correct and acceptable to the native speakers, but was not grammaticalised and had a very low frequency. This result is interesting, but not surprising, since the informants chosen for this file conformed to the NORMS category (non-mobile old rural males. They were born around the turn of the 19c/20c and acquired their language now more than 100 years ago. This was well before the independence of the Republic. They would have acquired their Irish orally from native speakers and underwent very little formal training in Irish, or none. This small sample confirms that Irish did not belong to the broad linguistic area in Western Europe which makes use of periphrastic DO constructions, at least not until very recently.
A report of Mikhail Gasparov's 1989 book on the 'History of European Versification' is the starting point of the discussion in this article of the types of versification found in the Insular Celtic literatures from their first documenation in the early middle ages to the present day, as Gasparov's survey does not cover these poetries. It is claimed here that their metrical constraints were pre-literate and first and foremost geared at aural reception. The introduction of writing led to an increase in metrical sophistication which, while still basically oral, because of the process of "prelecting" (i.e. reading out aloud to illiterate or semi-literate audiences), required a very careful appreciation of their metrical skills. Contact with English and French syllabic poetry in the later middle ages and particularly in the modern period produced so-called "free verse" poetry. The word "free" in this particular context meant that the rather loose metrical constraints of these majority literatures in no way compared with the extraordinarily high metrical sophistication of the native oral derived or "bardic" poetry.
South Africa's endemic Knysna seahorse, Hippocampus capensis Boulenger 1900, is a rare example of a marine fish listed as Endangered by the IUCN because of its limited range and habitat vulnerability. It is restricted to four estuaries on the southern coast of South Africa. This study reports on its biology in the Knysna and Swartvlei estuaries, both of which are experiencing heavy coastal development. We found that H. capensis was distributed heterogeneously throughout the Knysna Estuary, with a mean density of 0.0089 m-2 and an estimated total population of 89 000 seahorses (95% confidence interval: 30 000 to 148 000). H. capensis was found most frequently in low density vegetation stands ( 20% cover) and grasping Zostera capensis. Seahorse density was not otherwise correlated with habitat type or depth. The size of the area in which any particular seahorse was resighted did not differ between males and females. Adult sex ratios were skewed in most transects, with more males than females, but were even on a 10 m by 10 m focal study grid. Only three juveniles were sighted during the study. Both sexes were reproductively active but no greeting or courtship behaviours were observed. Males on the focal study grid were longer than females, and had shorter heads and longer tails, but were similar in colouration and skin filamentation. The level of threat to H. capensis and our limited knowledge of its biology mean that further scientific study is urgently needed to assist in developing sound management practices.
Due to their extremely small luminosity compared to the stars they orbit, planets outside our own Solar System are extraordinarily difficult to detect directly in optical light. Careful photometric monitoring of distant stars, however, can reveal the presence of exoplanets via the microlensing or eclipsing effects they induce. The international PLANET collaboration is performing such monitoring using a cadre of semi-dedicated telescopes around the world. Their results constrain the number of gas giants orbiting 1-7 AU from the most typical stars in the Galaxy. Upgrades in the program are opening regions of ''exoplanet discovery space'' - toward smaller masses and larger orbital radii - that are inaccessible to the Doppler velocity technique.
We present a determination of the optical/UV AGN luminosity function and its evolution, based on a large sample of faint (R < 24) QSOs identified in the COMBO-17 survey. Using multi-band photometry in 17 filters within 350 nm <~ lambdaobs <~ 930 nm, we could simultaneously determine photometric redshifts with an accuracy of sigmaz <0.03 and obtain spectral energy distributions. The redshift range covered by the sample is 1.2 < z < 4.8, which implies that even at z =~ 3, the sample reaches below luminosities corresponding to MB = -23, conventionally employed to distinguish between Seyfert galaxies and quasars. We clearly detect a broad plateau-like maximum of quasar activity around z =~ 2 and map out the smooth turnover between z =~ 1 and z =~ 4. The shape of the LF is characterised by some mild curvature, but no sharp ``break'' is present within the range of luminosities covered. Using only the COMBO-17 data, the evolving LF can be adequately described by either a pure density evolution (PDE) or a pure luminosity evolution (PLE) model. However, the absence of a strong L*-like feature in the shape of the LF inhibits a robust distinction between these modes. We present a robust estimate for the integrated UV luminosity generation by AGN as a function of redshift. We find that the LF continues to rise even at the lowest luminosities probed by our survey, but that the slope is sufficiently shallow that the contribution of low-luminosity AGN to the UV luminosity density is negligible. Although our sample reaches much fainter flux levels than previous data sets, our results on space densities and LF slopes are completely consistent with extrapolations from recent major surveys such as SDSS and 2QZ.