58 research outputs found

    Localization and Characterization of STRO-1+ Cells in the Deer Pedicle and Regenerating Antler

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    The annual regeneration of deer antlers is a unique developmental event in mammals, which as a rule possess only a very limited capacity to regenerate lost appendages. Studying antler regeneration can therefore provide a deeper insight into the mechanisms that prevent limb regeneration in humans and other mammals, and, with regard to medical treatments, may possibly even show ways how to overcome these limitations. Traditionally, antler regeneration has been characterized as a process involving the formation of a blastema from de-differentiated cells. More recently it has, however, been hypothesized that antler regeneration is a stem cell-based process. Thus far, direct evidence for the presence of stem cells in primary or regenerating antlers was lacking. Here we demonstrate the presence of cells positive for the mesenchymal stem cell marker STRO-1 in the chondrogenic growth zone and the perivascular tissue of the cartilaginous zone in primary and regenerating antlers as well as in the pedicle of fallow deer (Dama dama). In addition, cells positive for the stem cell/progenitor cell markers STRO-1, CD133 and CD271 (LNGFR) were isolated from the growth zones of regenerating fallow deer antlers as well as the pedicle periosteum and cultivated for extended periods of time. We found evidence that STRO-1+ cells isolated from the different locations are able to differentiate in vitro along the osteogenic and adipogenic lineages. Our results support the view that the annual process of antler regeneration might depend on the periodic activation of mesenchymal progenitor cells located in the pedicle periosteum. The findings of the present study indicate that not only limited tissue regeneration, but also extensive appendage regeneration in a postnatal mammal can occur as a stem cell-based process

    Measurement of the Neutron Spin Structure Function g1ng_1^n with a Polarized ^3He Target

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    Results are reported from the HERMES experiment at HERA on a measurement of the neutron spin structure function g1n(x,Q2)g_1^n(x,Q^2) in deep inelastic scattering using 27.5 GeV longitudinally polarized positrons incident on a polarized 3^3He internal gas target. The data cover the kinematic range 0.023<x<0.60.023<x<0.6 and 1(GeV/c)2<Q2<15(GeV/c)21 (GeV/c)^2 < Q^2 <15 (GeV/c)^2. The integral 0.0230.6g1n(x)dx\int_{0.023}^{0.6} g_1^n(x) dx evaluated at a fixed Q2Q^2 of 2.5(GeV/c)22.5 (GeV/c)^2 is 0.034±0.013(stat.)±0.005(syst.)-0.034\pm 0.013(stat.)\pm 0.005(syst.). Assuming Regge behavior at low xx, the first moment Γ1n=01g1n(x)dx\Gamma_1^n=\int_0^1 g_1^n(x) dx is 0.037±0.013(stat.)±0.005(syst.)±0.006(extrapol.)-0.037\pm 0.013(stat.)\pm 0.005(syst.)\pm 0.006(extrapol.).Comment: 4 pages TEX, text available at http://www.krl.caltech.edu/preprints/OAP.htm

    Observation of a coherence length effect in exclusive ρ(0) electroproduction

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    Exclusive incoherent electroproduction of the ρ0(770) meson from 1H, 2H, 3He, and 14N targets has been studied by the HERMES experiment at squared four-momentum transfer Q^2>0.4 GeV^2 and positron energy loss ν from 9 to 20 GeV. The ratio of the 14N to 1H cross sections per nucleon, known as the nuclear transparency, was found to decrease with increasing coherence length of quark-antiquark fluctuations of the virtual photon. The data provide clear evidence of the interaction of the quark-antiquark fluctuations with the nuclear medium

    Women in the workplace and the Development of DEFA documentary style.

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    In the two decades since the fall of the Wall, the work of some of the documentary filmmakers of the German Democratic Republic has entered to some extent into the pages of English language documentary film histories. There is a full entry on the German Democratic Republic in the Encylopedia of the Documentary Film published in 2006 where they have been recognized for their development of a distinct aesthetic during the 1970s and 1980s to represent the work and workers of a twentieth century communist state. The more overtly propagandistic compilation films of Andrew and Annelie Thorndike during the 1940s and 1950s had already been described in Erik Barnouw’s history of documentary, together with the anti-Vietnam war films of Heynowski and Scheumann. The new generation of filmmakers working in the 1970s and 1980s, however, are not mentioned in later editions of Barnouw’s overview. This paper seeks to highlight the energy and commitment of DEFA documentary filmmakers in the seventies and eighties who sought to apply some of the principles of observation and cinema truth practised in Western Europe and the USA and shown and debated at the Leipzig documentary film festival

    Isolation and whole genome analysis of endospore-forming bacteria from heroin.

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    Kalinowski J, Ahrens B, Al-Dilaimi A, et al. Isolation and whole genome analysis of endospore-forming bacteria from heroin. Forensic Sci Int Genet. 2017;32:1-6.Infections caused by endospore-forming bacteria have been associated with severe illness and death among persons who inject drugs. Analysis of the bacteria residing in heroin has thus been biased towards species that affect human health. Similarly, exploration of the bacterial diversity of seized street market heroin correlated with the skin microflora of recreational heroin users insofar as different Staphylococus spp. or typical environmental endospore formers including Bacillus cereus and other Bacilli outside the B. cereus sensu lato group as well as diverse Clostridia were identified. In this work 82 samples of non-street market ("wholesale") heroin originating from the German Federal Criminal Police Office's heroin analysis program seized during the period between 2009 and 2014 were analyzed for contaminating bacteria. Without contact with the end user and with only little contaminations introduced by final processing, adulteration and cutting this heroin likely harbors original microbiota from the drug's original source or trafficking route. We found this drug to be only sparsely populated with retrievable heterotrophic, aerobic bacteria. In total, 68 isolates were retrieved from 49 out of 82 samples analyzed (60% culture positive). All isolates were endospore-forming, Gram-positive Bacilli. Completely absent were non-endospore-formers or Gram-negatives. The three most predominant species were Bacillus clausii, Bacillus (para)licheniformis, and Terribacillus saccharophilus. Whole genome sequencing of these 68 isolates was performed using Illumina technology. Sequence data sets were assembled and annotated using an automated bioinformatics pipeline. Average nucleotide identity (ANI) values were calculated for all draft genomes and all close to identical genomes (ANI>99.5%) were compared to the forensic data of the seized drug, showing positive correlations that strongly warrant further research on this subject
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