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Institute
- Institut für Biochemie und Biologie (209)
- Institut für Chemie (129)
- Institut für Geowissenschaften (120)
- Institut für Physik und Astronomie (115)
- Wirtschaftswissenschaften (98)
- Historisches Institut (84)
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- Institut für Romanistik (78)
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- Department Psychologie (69)
"Bürokratieabbauer" im Aufwind : erste Erfahrungen mit der Anwendung des Standardkosten-Modells
(2009)
"Dem Leben auf der Spur"
(2009)
"Der vergessene Partner"
(2009)
"Wir mußten uns die Aufgabe stellen, wenigstens bei Eintritt eines bewaffneten Konfliktes jederzeit in der Lage zu sein, die fehlenden Waffen neu erstehen zu lassen; ähnlich wie es die nordamerikanische Armee, die aus Sparsamkeit in Friedenszeiten nur wenig stärker war als unsere Reichswehr, für den Ernstfall auf Grund der Erfahrungen im Weltkriege 1917 vorgesehen hatte. Meine Reise nach Nordamerika als Chef der Heeresleitung im Jahre 1927 gab in dieser Beziehung sehr gute Aufklärung für unsere Belange."
So betrachtete General Wilhelm Heye seinen eigenen Besuch in den USA und führte ein Kapitel der Beziehungen der Reichswehr zu einer auswärtigen Macht an, welches bisher kaum beachtet worden ist. Während die geheimen Verbindungen der Reichswehr zur Roten Armee bereits auf breites, wissenschaftliches Interesse gestoßen sind und Inhalt vielfacher Untersuchungen waren, so ist deren Zusammenarbeit mit der U.S. Army bisher kaum ins Blickfeld der historischen Forschung gerückt. Die Missionen und Kommandierungen zwischen 1922 und 1933 von nahezu 30 Offizieren, unter denen sich auch namhafte Vertreter wie Wilhelm Speidel, Werner von Blomberg und Walter Warlimont befanden, sind daher fast gänzlich unbekannt.
Die Arbeit befasst sich auf der Ebene des Textes mit der Frage nach dem Textproduzenten der Buchform des Dramas. Gibt es im Drama ähnlich wie in der Epik oder Lyrik eine vermittelnde Instanz? Und sind die Nebentexte tatsächlich als Anweisungen oder nicht doch eher als Hinweise zu verstehen? Am Beispiel des expressionistischen Dramas "Geschehen" von August Stramm werden die vorherigen Überlegungen überprüft und für eine Textanalyse fruchtbar gemacht.
"Republikflucht" und "Fluchthelfer" : ein verdrängtes Kapitel deutsch-deutscher Sportbeziehungen
(2009)
Wenn in einem verbrannten Gebäude, in dem sich unliebsame Untermieter breit gemacht haben, diese damit beginnen, Stein für Stein das restliche Gemäuer abzutragen, um die verbliebenen Fenster zuzumauern, wird es Zeit, mit mehr oder weniger freundlichen Worten die Bewohner des Hauses zu verweisen, die nur verhindern, dass sich neue Besucher dem Gelände nähern. Dafür muss freilich alter und neuer Behang von den Wänden genommen werden; und eben durch die Verbannung all dessen, was nicht an diesen Ort gehört, kann ein freundliches Bild des Dichters Friedrich Hölderlin erhalten bleiben, der nicht nur poetisch, sondern auch zwischenmenschlich einigen bedeutenden Persönlichkeiten seiner Zeit im Wege stand, was ihm wohl in beiden Aspekten zum Verhängnis geworden ist, weil er sich weder verwandtschaftlich noch im Rahmen des poetischen Geschäfts gegen seine intrigante Umgebung zur Wehr zu setzen wusste. Der etwas länger geratene Aufsatz „So sind die Zeichen in der Welt“ soll weder ein neues Heiligenbild schaffen noch einen frisch aus der Tasche gezogenen Popstar zum Liebhaben, sondern will behutsam einige Fresken des Gedankengebäudes Hölderlin für diejenigen freilegen, deren Bild des Dichters noch nicht völlig von der Vorstellung des wahnsinnig gewordenen Dichters übertüncht worden ist. Obwohl sich die Arbeit damit ganz bewusst den Hölderlin - Studien von Pierre Bertaux anschließt, setzt sie sich auch mit dieser Wahrnehmungslinie kritisch auseinander, indem sie neben biographischen Anmerkungen auch stil- und ideologiekritische Methoden einsetzt, um die manchmal unübersichtliche Quellenlage ein wenig durchsichtiger zu machen, als dies bisher der Fall ist. Über eine solche, in Einzelheiten vielleicht unorthodox wirkende Darstellung hinaus will die Arbeit die Behandlungsmöglichkeit von Friedrich Hölderlin im Deutschunterricht des Gymnasiums nahe legen, weil selbst Jüngeres über ihn behandelt wird, das darauf hinweist, inwiefern die Marginalisierung dieses Poeten damit zu tun hat, dass er während eines langen Abschnitts der Literaturgeschichte auch dafür verantwortlich gemacht wurde, was er weder geschrieben hat noch meinte. Die Intention der Arbeit besteht insgesamt in der Vorstellung, das Gedankengut Hölderlins müsse aus dem breiten Strom einer konservativen Wahrnehmungstradition entfernt werden (zu der beispielsweise auch die dramatische Hölderlin - Bearbeitung E. Jelineks Wolken.Heim. gezählt werden kann, selbst wenn sie widerborstig gemeint sein sollte) und dieser Dichter sei als realistischer Denker zu restaurieren, der sich deshalb dem Literaturbetrieb seiner Zeit entgezogen hat, weil er, selbst der Lebensführung nach, sehr früh die Bewegungen gegen französische Aufklärung und Revolution begriffen hat – und von deren massiver Ablehnung Hölderlin bis heute getroffen wird. Da Friedrich Hölderlin aber nicht nur ideologischer Betrachtung, Kritik und Verfälschung ausgesetzt ist, sondern auch regelmäßig Gegenstand umfangreicher biographisch - psychologischer Spekulationen darstellt, wurde dieser Aspekt nicht nur bezogen auf die Rezeptionsgeschichte untersucht, sondern am Gegenstand selbst. In diesem Zusammenhang konnte nicht nur eine bislang vernachlässigte Beziehung Hölderlins zu Sophie Mereau rekonstruiert und der Verdacht zurückgewiesen werden, es habe zur selben Zeit eine homoerotische Beziehung zu Isaak Sinclair bestanden, vielmehr gelang auch der Nachweis, dass das Verhältnis des Dichters zu Susette Gontard weder singulär noch konkurrenzlos gewesen ist, weshalb sich eine eindeutige Zuordnung dieser Frau zur poetischen Figur der Diotima verbietet. Dazu wurde einerseits der Umstand entmythologisiert, nach dem die Liebe zur Frankfurter Zeit platonisch betrieben wurde, andererseits aber diese Affaire den Verhältnissen Hölderlins zu anderen Frauen zugeordnet, mit denen sich Frau Gontard – letztlich erfolglos – dadurch auseinander zu setzen versuchte, dass sie die Rolle Diotimas okkupierte. Dabei ließ sich schließlich der Verdacht erhärten, die stabilste Bindung des Dichters an eine Frau sei die zur eigenen Schwester Heinrike gewesen, mit der bis zum Bruch von Bordeaux aus zwar unregelmäßig, aber emotional immer wieder ausufernde Briefe getauscht wurden. Es ist nicht ohne Ironie, wenn ausgerechnet im vielleicht bekanntesten Gedicht Hölderlins, der „Hälfte des Lebens“, in dem regelmäßig ein bedeutender philosophischer Entwurf gesehen wird, Rudimente eines Textes enthalten sind, der – eindeutig erotisch konnotiert – an die eigene Schwester gerichtet ist.
2,11-Dialkylated 1,12-diazaperylenes (alkyl = Me, Et, iPr) dmedap, detdap and dipdap have been synthesized by reductive cyclization of 3,3-dialkylated 1,1-biisoquinolines 3a-c, resulting in the first copper(I) complexes of a large- surface ligand. The new copper(I) complexes show low-energy MLCT absorptions unprecedented for bis(-diimin)copper(I) complexes. The solid structures of the complexes[Cu(dipdap)2]BF4·CH2Cl2·1.5H2O, [Cu(dipdap)2]OTf·CH2Cl2, [Cu(dipdap)2]I·C2H4Cl2·THF·2H2O, [Cu(dmedap)2]OTf and [Cu(dipdap)2]AQSO3·H2O (AQSO3 = sodium 9,10-dihydro-9,10-dioxo-2- anthracenesulfonate) are reported. In [Cu(dipdap)2]BF4·CH2Cl2·1.5H2O, each copper(I) complex cation interacts with two others by - stacking interactions forming a novel supramolecular column structural motif running along the crystallographic c axis. In the crystalline compound [Cu(dipdap)2]AQSO3·H2O, aggregation between two complex cations and two additional anions by - stacking interactions is observed, leading to a tetrameric assembly. Furthermore, the three complex compounds [Cu(L)2]BF4 (L = dmedap, detdap, dipdap) were tested for sensory applications in aqueous buffer solutions in electrochemical studies of the complex immobilized on glassy carbon electrodes.
In this paper, two non-destructive thermal methods are used in order to determine, with a high degree of accuracy, three-dimensional polarization distributions in thin films (12 mu m) of poly(vinylidenefluoride- trifluoroethylene) (PVDF-TrFE). The techniques are the frequency-domain Focused Laser Intensity Modulation Method (FLIMM) and time-domain Thermal-Pulse Tomography (TPT). Samples were first metalized with grid-shaped electrode and poled. 3D polarization mapping yielded profiles which reproduce the electrode-grid shape. The polarization is not uniform across the sample thickness. Significant polarization values are found only at depths beyond 0.5 mu m from the sample surface. Both methods provide similar results, TPT method being faster, whereas the FLIMM technique has a better lateral resolution.
Welchen Aufgaben soll sich die NATO zuwenden? Wo soll sie enden? Als klassisches Militärbündnis verliert sie jedenfalls an Bedeutung. Die gegenwärtige Krise der regionalen Allianz mit globaler Reichweite muss genutzt werden für eine strategische Neuausrichtung der Struktur und Funktion des Bündnisses. Die Rolle der NATO als Werkzeug für multinationale Interventionen entscheidet über die Bildung globaler Koalitionen.
A new pterocarpan (named 8-methoxyneorautenol) was isolated from the acetone ext. of the root bark of Erythrina abyssinica. In addn., the known isoflavonoid derivs. eryvarin L, erycristagallin and shinpterocarpin were identified for the first time from the roots of this plant. The structures were detd. on the basis of spectroscopic evidence. The new compd. showed selective antimicrobial activity against Trichophyton mentagrophytes. The acetone ext. of the root bark of E. abyssinica showed radical scavenging activity towards 2,2-diphenyl-1-picrylhydrazyl radical (DPPH). The pterocarpenes, 3-hydroxy-9-methoxy-10-(3,3-dimethylallyl)pterocarpene and erycristagallin, were the most active constituents of the roots of this plant and showing dose-dependent activities similar to that of the std. quercetin. [on SciFinder (R)]
The generalized hybrid Monte Carlo (GHMC) method combines Metropolis corrected constant energy simulations with a partial random refreshment step in the particle momenta. The standard detailed balance condition requires that momenta are negated upon rejection of a molecular dynamics proposal step. The implication is a trajectory reversal upon rejection, which is undesirable when interpreting GHMC as thermostated molecular dynamics. We show that a modified detailed balance condition can be used to implement GHMC without momentum flips. The same modification can be applied to the generalized shadow hybrid Monte Carlo (GSHMC) method. Numerical results indicate that GHMC/GSHMC implementations with momentum flip display a favorable behavior in terms of sampling efficiency, i.e., the traditional GHMC/GSHMC implementations with momentum flip got the advantage of a higher acceptance rate and faster decorrelation of Monte Carlo samples. The difference is more pronounced for GHMC. We also numerically investigate the behavior of the GHMC method as a Langevin-type thermostat. We find that the GHMC method without momentum flip interferes less with the underlying stochastic molecular dynamics in terms of autocorrelation functions and it to be preferred over the GHMC method with momentum flip. The same finding applies to GSHMC.
Situated in an active tectonic region, Santiago de Chile, the country's capital with more than six million inhabitants, faces tremendous earthquake risk. Macroseismic data for the 1985 Valparaiso event show large variations in the distribution of damage to buildings within short distances, indicating strong effects of local sediments on ground motion. Therefore, a temporary seismic network was installed in the urban area for recording earthquake activity and a study was carried out aiming to estimate site amplification derived from horizontal-to- vertical (H/V) spectral ratios from earthquake data (EHV) and ambient noise (NHV), as well as using the standard spectral ratio (SSR) technique with a nearby reference station located on igneous rock. The results lead to the following conclusions: The analysis of earthquake data shows significant dependence on the local geological structure with respect to amplitude and duration. An amplification of ground motion at frequencies higher than the fundamental one can be found. This amplification would not be found when looking at NHV ratios alone. The analysis of NHV spectral ratios shows that they can only provide a lower bound in amplitude for site amplification. P-wave site responses always show lower amplitudes than those derived by S waves, and sometimes even fail to provide some frequencies of amplification. No variability in terms of time and amplitude is observed in the analysis of the H/V ratio of noise. Due to the geological conditions in some parts of the investigated area, the fundamental resonance frequency of a site is difficult to estimate following standard criteria proposed by the SESAME consortium, suggesting that these are too restrictive under certain circumstances.
Nonlinear force-free field (NLFFF) models are thought to be viable tools for investigating the structure, dynamics, and evolution of the coronae of solar active regions. In a series of NLFFF modeling studies, we have found that NLFFF models are successful in application to analytic test cases, and relatively successful when applied to numerically constructed Sun-like test cases, but they are less successful in application to real solar data. Different NLFFF models have been found to have markedly different field line configurations and to provide widely varying estimates of the magnetic free energy in the coronal volume, when applied to solar data. NLFFF models require consistent, force-free vector magnetic boundary data. However, vector magnetogram observations sampling the photosphere, which is dynamic and contains significant Lorentz and buoyancy forces, do not satisfy this requirement, thus creating several major problems for force-free coronal modeling efforts. In this paper, we discuss NLFFF modeling of NOAA Active Region 10953 using Hinode/SOT-SP, Hinode/XRT, STEREO/SECCHI-EUVI, and SOHO/MDI observations, and in the process illustrate three such issues we judge to be critical to the success of NLFFF modeling: (1) vector magnetic field data covering larger areas are needed so that more electric currents associated with the full active regions of interest are measured, (2) the modeling algorithms need a way to accommodate the various uncertainties in the boundary data, and (3) a more realistic physical model is needed to approximate the photosphere-to-corona interface in order to better transform the forced photospheric magnetograms into adequate approximations of nearly force-free fields at the base of the corona. We make recommendations for future modeling efforts to overcome these as yet unsolved problems.
A cytoplasmically inherited chlorophyll-deficient mutant of barley (Hordeum vulgare) termed cytoplasmic line 3 (CL3), displaying a viridis (homogeneously light-green colored) phenotype, has been previously shown to be affected by elevated temperatures. In this article, biochemical, biophysical, and molecular approaches were used to study the CL3 mutant under different temperature and light conditions. The results lead to the conclusion that an impaired assembly of photosystem I (PSI) under higher temperatures and certain light conditions is the primary cause of the CL3 phenotype. Compromised splicing of ycf3 transcripts, particularly at elevated temperature, resulting from a mutation in a noncoding region (intron 1) in the mutant ycf3 gene results in a defective synthesis of Ycf3, which is a chaperone involved in PSI assembly. The defective PSI assembly causes severe photoinhibition and degradation of PSII.
Background: Very recently a gene marker panel that allows the mutational analysis of APC, CTNNB1, B-RAF and K-RAS was conceived. The aim of the present study was to use the 4-gene marker panel covering the Wnt and Ras-Raf-MEK-MAPK signalling pathways to determine the percentage of sporadic colorectal carcinomas (CRC) carrying at least one of the four above-mentioned genes in a mutated form alone and/or in combination with microsatellite instability (MSI) and to compare the sensitivity of the gene marker panel used in this study with that of gene marker panels previously reported in the scientific literature. Methods: CTNNB1 and B-RAF were screened by PCR-single-strand conformation polymorphism analysis and K-RAS gene mutations by restriction fragment length polymorphism analysis. For the mutational analysis of the APC gene mutation cluster region (codons 1243–1567) direct DNA sequencing was performed. The U.S. National Cancer Institute microsatellite panel (BAT25, BAT26, D2S123, D5S346 and D17S250) was used for MSI analysis. Results: It could be shown that about 80% of early stage CRC (UICC stages I and II) and over 90% of CRC in the UICC stage IV carried at least one mutated gene and/or showed MSI. No significant increase in the gene mutation frequencies could be determined when comparing tumours in the UICC stage I with those in UICC stage IV. Conclusions: When compared with previously published gene marker panels the 4-gene marker panel used in the present study shows an excellent performance, allowing to detect genetic alterations in 80–90% of human sporadic CRC samples analyzed.
The study reports a group-randomized trial of a theatre-based intervention to prevent sexual abuse targeting first and second grade primary school children in Germany. A sample of 148 first and second graders saw a live performance of a play designed to promote skills in dealing with abuse-prone interactions with adults, watched a recording of the play on DVD or were assigned to a no intervention control group. Both the live performance and the DVD groups showed significant increases in the target variables (distinguishing good/bad touch and secrets, getting help, rejecting unwanted touch) from baseline to post-intervention and a follow-up after 2 weeks, while the control group did not show changes. The live performance and DVD groups participated in a further follow-up 30 weeks post-intervention, which showed sustained effects of the intervention. The findings indicate that with appropriately culture-sensitive measures, Sexual abuse prevention programmes can have Sustainable effects with young primary school children.
Motivation: Full-length DNA and protein sequences that span the entire length of a gene are ideally used for multiple sequence alignments (MSAs) and the subsequent inference of their relationships. Frequently, however, MSAs contain a substantial amount of missing data. For example, expressed sequence tags (ESTs), which are partial sequences of expressed genes, are the predominant source of sequence data for many organisms. The patterns of missing data typical for EST-derived alignments greatly compromise the accuracy of estimated phylogenies. Results: We present a statistical method for inferring phylogenetic trees from EST-based incomplete MSA data. We propose a class of hierarchical models for modeling pairwise distances between the sequences, and develop a fully Bayesian approach for estimation of the model parameters. Once the distance matrix is estimated, the phylogenetic tree may be constructed by applying neighbor-joining (or any other algorithm of choice). We also show that maximizing the marginal likelihood from the Bayesian approach yields similar results to a pro. le likelihood estimation. The proposed methods are illustrated using simulated protein families, for which the true phylogeny is known, and one real protein family.
We examined individual differences in masked repetition priming by re-analyzing item-level response-time (RT) data from three experiments. Using a linear mixed model (LMM) with subjects and items specified as crossed random factors, the originally reported priming and word-frequency effects were recovered. In the same LMM, we estimated parameters describing the distributions of these effects across subjects. Subjects’ frequency and priming effects correlated positively with each other and negatively with mean RT. These correlation estimates, however, emerged only with a reciprocal transformation of RT (i.e., -1/RT), justified on the basis of distributional analyses. Different correlations, some with opposite sign, were obtained (1) for untransformed or logarithmic RTs or (2) when correlations were computed using within-subject analyses. We discuss the relevance of the new results for accounts of masked priming, implications of applying RT transformations, and the use of LMMs as a tool for the joint analysis of experimental effects and associated individual differences.
Many formal descriptions of DPLL-based SAT algorithms either do not include all essential proof techniques applied by modern SAT solvers or are bound to particular heuristics or data structures. This makes it difficult to analyze proof-theoretic properties or the search complexity of these algorithms. In this paper we try to improve this situation by developing a nondeterministic proof calculus that models the functioning of SAT algorithms based on the DPLL calculus with clause learning. This calculus is independent of implementation details yet precise enough to enable a formal analysis of realistic DPLL-based SAT algorithms.
A macro-tidal freshwater ecosystem recovering from hypereutrophication : the Schelde lease study
(2009)
We report a 40 year record of eutrophication and hypoxia on an estuarine ecosystem and its recovery from hypereutrophication. After decades of high inorganic nutrient concentrations and recurring anoxia and hypoxia, we observe a paradoxical increase in chlorophyll-a concentrations with decreasing nutrient inputs. We hypothesise that algal growth was inhibited due to hypereutrophication, either by elevated ammonium concentrations, severe hypoxia or the production of harmful substances in such a reduced environment. We study the dynamics of a simple but realistic mathematical model, incorporating the assumption of algal growth inhibition. It shows a high algal biomass, net oxygen production equilibrium with low ammonia inputs, and a low algal biomass, net oxygen consumption equilibrium with high ammonia inputs. At intermediate ammonia inputs it displays two alternative stable states. Although not intentional, the numerical output of this model corresponds to observations, giving extra support for assumption of algal growth inhibition. Due to potential algal growth inhibition, the recovery of hypereutrophied systems towards a classical eutrophied state, will need reduction of waste loads below certain thresholds and will be accompanied by large fluctuations in oxygen concentrations. We conclude that also flow-through systems, heavily influenced by external forcings which partly mask internal system dynamics, can display multiple stable states.
We present a Monte Carlo technique for sampling from the canonical distribution in molecular dynamics. The method is built upon the Nose-Hoover constant temperature formulation and the generalized hybrid Monte Carlo method. In contrast to standard hybrid Monte Carlo methods only the thermostat degree of freedom is stochastically resampled during a Monte Carlo step.
For the elucidation of the dynamics of signal transduction processes that are induced by cellular interactions, defined events along the signal transduction cascade and subsequent activation steps have to be analyzed and then also correlated with each other. This cannot be achieved by ensemble measurements because averaging biological data ignores the variability in timing and response patterns of individual cells and leads to highly blurred results. Instead, only a multi-parameter analysis at a single-cell level is able to exploit the information that is crucially needed for deducing the signaling pathways involved. The aim of this work was to develop a process line that allows the initiation of cell-cell or cell-particle interactions while at the same time the induced cellular reactions can be analyzed at various stages along the signal transduction cascade and correlated with each other. As this approach requires the gentle management of individually addressable cells, a dielectrophoresis (DEP)-based microfluidic system was employed that provides the manipulation of microscale objects with very high spatiotemporal precision and without the need of contacting the cell membrane. The system offers a high potential for automation and parallelization. This is essential for achieving a high level of robustness and reproducibility, which are key requirements in order to qualify this approach for a biomedical application. As an example process for intercellular communication, T cell activation has been chosen. The activation of the single T cells was triggered by contacting them individually with microbeads that were coated with antibodies directed against specific cell surface proteins, like the T cell receptor-associated kinase CD3 and the costimulatory molecule CD28 (CD; cluster of differentiation). The stimulation of the cells with the functionalized beads led to a rapid rise of their cytosolic Ca2+ concentration which was analyzed by a dual-wavelength ratiometric fluorescence measurement of the Ca2+-sensitive dye Fura-2. After Ca2+ imaging, the cells were isolated individually from the microfluidic system and cultivated further. Cell division and expression of the marker molecule CD69 as a late activation event of great significance were analyzed the following day and correlated with the previously recorded Ca2+ traces for each individual cell. It turned out such that the temporal profile of the Ca2+ traces between both activated and non-activated cells as well as dividing and non-dividing cells differed significantly. This shows that the pattern of Ca2+ signals in T cells can provide early information about a later reaction of the cell. As isolated cells are highly delicate objects, a precondition for these experiments was the successful adaptation of the system to maintain the vitality of single cells during and after manipulation. In this context, the influences of the microfluidic environment as well as the applied electric fields on the vitality of the cells and the cytosolic Ca2+ concentration as crucially important physiological parameters were thoroughly investigated. While a short-term DEP manipulation did not affect the vitality of the cells, they showed irregular Ca2+ transients upon exposure to the DEP field only. The rate and the strength of these Ca2+ signals depended on exposure time, electric field strength and field frequency. By minimizing their occurrence rate, experimental conditions were identified that caused the least interference with the physiology of the cell. The possibility to precisely control the exact time point of stimulus application, to simultaneously analyze short-term reactions and to correlate them with later events of the signal transduction cascade on the level of individual cells makes this approach unique among previously described applications and offers new possibilities to unravel the mechanisms underlying intercellular communication.
In the present study, we describe synthesis and photochemical behaviour of the coumarinylmethyl phenyl ethers 1 and 6-10. Irradiation of the compounds in polar solvents leads to o-, p- and m-hydroxybenzyl substituted coumarins as main products. A side reaction is the photosolvolysis of the ethers that gives the (coumarin-4-yl)methyl alcohol and the corresponding phenol. Detailed studies of the quantum yields and product distributions upon irradiation of 6 as a function of the solvents are indicative of a dominant role of an ionic pathway in photochemical conversions. The found photochemical rearrangement is a useful tool for the preparation of hydroxylated 4-benzylcoumarins. A series of such compounds have been synthesised.
Using degenerate primers, we were able to identify seven Hox genes for the myzostomid Myzostoma cirriferum. The recovered fragments belong to anterior class (Mci_lab, Mci_pb), central class (Mci_Dfd, Mci_Lox5, Mci_Antp, Mci_Lox4), and posterior class (Mci_Post2) paralog groups. Orthology assignment was verified by phylogenetic analyses and presence of diagnostic regions in the homeodomain as well as flanking regions. The presence of Lox5, Lox4, and Post2 supports the inclusion of Myzostomida within Lophotrochozoa. We found signature residues within flanking regions of Lox5, which are also found in annelids, but not in Platyhelminthes. As such the available Hox genes data of myzostomids support an annelid relationship.
Three DNA regions carrying genes encoding putative homologs of xanthine dehydrogenases were identified in Escherichia coli, named xdhABC, xdhD, and yagTSRQ. Here, we describe the purification and characterization of gene products of the yagTSRQ operon, a molybdenum-containing iron-sulfur flavoprotein from E. coli, which is located in the periplasm. The 135 kDa enzyme comprised a noncovalent (alpha beta gamma) heterotrimer with a large (78.1 kDa) molybdenum cofactor (Moco)-containing YagR subunit, a medium (33.9 kDa) FAD-containing YagS subunit, and a small (21.0 kDa) 2 x [2Fe2S]-containing YagT subunit. YagQ is not a subunit of the mature enzyme, and the protein is expected to be involved in Moco modification and insertion into YagTSR. Analysis of the form of Moco present in YagTSR revealed the presence of the molybdopterin cytosine dinucleotide cofactor. Two different [2Fe2S] clusters, typical for this class of enzyme, were identified by EPR. YagTSR represents the first example of a molybdopterin cytosine dinucleotide-containing protein in E. coli. Kinetic characterization of the enzyme revealed that YagTSR converts a broad spectrum of aldehydes, with a preference for aromatic aldehydes. Ferredoxin instead of NAD(+) or molecular oxygen was used as terminal electron acceptor. Complete growth inhibition of E. coli cells devoid of genes from the yagTSRQ operon was observed by the addition of cinnamaldehyde to a low-pH medium. This finding shows that YagTSR might have a role in the detoxification of aromatic aldehydes for E. coli under certain growth conditions.
We report on the detection of a population of weak metal-line absorbers in the halo or nearby intergalactic environment of the Milky Way. Using high-resolution ultraviolet absorption-line spectra of bright quasars (QSO) obtained with the Space Telescope Imaging Spectrograph (STIS), along six sight lines we have observed unsaturated, narrow absorption in O I and Si II, together with mildly saturated C II absorption at high radial velocities (vertical bar v(LSR)vertical bar = 100-320 km s(-1)). The measured O I column densities lie in the range N(O I) 2 x 10(14) cm(-2) implying that these structures represent Lyman limit Systems and sub-Lyman limit System with H I column densities between 10(16) and 3 x 10(18) cm(-2), thus below the detection limits of current 21 cm all-sky surveys of high-velocity clouds (HVCs). The absorbers apparently are not directly associated with any of the large high column density HVC complexes, but rather represent isolated, partly neutral gas clumps embedded in a more tenuous, ionized gaseous medium situated in the halo or nearby intergalactic environment of the Galaxy. Photoionization modeling of the observed low ion ratios suggests typical hydrogen volume densities of n(H) > 0.02 cm(-3) and characteristic thicknesses of a several parsec down to subparsec scales. For three absorbers, metallicities are constrained in the range of 0.1-1.0 solar, implying that these gaseous structures may have multiple origins inside and outside the Milky Way. Using supplementary optical absorption-line data, we find for two other absorbers Ca II/O I column-density ratios that correspond to solar Ca/O abundance ratios. This finding indicates that these clouds do not contain significant amounts of dust. This population of low column density gas clumps in the circumgalactic environment of the Milky Way is indicative of the various processes that contribute to the circulation of neutral gas in the extended halos of spiral galaxies. These processes include the accretion of gas from the intergalactic medium and satellite galaxies, galactic fountains, and outflows. We speculate that this absorber population represents the local analog of weak Mg II systems that are commonly observed in the circumgalactic environment of low- and high-redshift galaxies.