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  • 1
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract. Persistent organochlorine residues such as hexachlorobenzene (HCB), hexachlorocyclohexane isomers (HCHs), chlorocyclodienes, and the DDT group (DDTs) were determined in fat and muscle samples of resident red-legged partridges (Alectoris rufa) hunted in Spain. Chlorinated contamination pattern varied largely depending on geographical distribution. Birds collected from the northern part of Spain contained greater concentrations of lindane (34.4 ng/g fat basis) than those from central or southern Spain. In contrast, red-legged partridges collected in southern locations exhibited elevated levels of p,p′-DDE (62.3 ng/g fat basis) as compared with central (31.2 ng/g fat basis) and northern areas (5.6 ng/g fat basis). The only cyclodiene detected, dieldrin, showed higher amounts (3.4 ng/g fat basis) in partridges collected in central Spain. The sex differences in pollutant occurrence and concentrations were negligible. One-year-old birds accumulated greater concentrations of β-HCH, and dieldrin than older birds. Global comparison of organochlorine concentrations indicated that northern partridges are more contaminated by compounds of industrial origin, whereas southern birds contained greater amounts of agricultural chemicals. Estimates of hazards associated with organochlorine levels in resident red-legged partridges in Spain suggested that southern birds may be at risk from exposure to DDTs, and northern birds may be affected by excessive concentrations of lindane. The use of red-legged partridge as bioindicator for OCP contamination is discussed.
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  • 2
    ISSN: 1434-601X
    Keywords: PACS. 21.10.Dr Binding energies and masses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Direct mass measurements of neutron-deficient rare-earth isotopes in the vicinity of 146Gd were performed with the Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN. This paper reports on the measurement of more than 40 isotopes of the elements praseodymium, neodymium, promethium, samarium, europium, dysprosium and holmium, that have been measured with a typical accuracy of m 14 keV. An atomic mass evaluation has been performed taking into account other experimental mass values via a least-squares adjustment. The results of the adjustment are discussed.
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  • 3
    ISSN: 1615-5742
    Keywords: Key words: cystic nephroma, renal tumors, Wilms' tumor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: ABSTRACT We report a case of juxtaposed Wilms' tumor (WT) and cystic nephroma (CN) in a 21-month-old girl which gave rise to radiological diagnostic difficulty. Preoperative chemotherapy was given, resulting in marked tumor necrosis but the cystic nephroma remained untouched. Histological examination showed characteristic features of a triphasic WT and a CN; the two lesions were separated by a thick fibrous capsule. While everybody agrees that WT and cystic partially differentiated nephroblastoma (CPDN) are closely related, there are two opposite views about their relationship to CN. One is that CN may represent the final step in maturation of WT and CPDN. Other authors argue that there is no evidence to support this theory but believe CN might have something in common with nephrogenic rests. We suggest that the two lesions in the present case may have originated from two intralobar nephrogenic rests, which would strengthen the latter view.
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  • 4
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A new facility for simultaneous extended X-ray absorption of fine structure (EXAFS), X-ray diffraction and photoluminescence measurements under high pressures has been developed for use on station 9.3 at the Daresbury Laboratory Synchrotron Radiation Source. This high-pressure facility can be used at any suitable beamline at a synchrotron source. Full remote operation of the rig allows simultaneous collection of optical and structural data while varying the pressure. The set-up is very flexible and can be tailored for a particular experiment, such as time- or temperature-dependent measurements. A new approach to the collection of high-pressure EXAFS data is also presented. The approach significantly shortens the experimental times and allows a dramatic increase in the quality of EXAFS data collected. It also opens up the possibility for EXAFS data collection at any pressure which can be generated using a diamond cell. The high quality of data collected is demonstrated with a GaN case study. Particular attention will be paid to the use of energy-dispersive EXAFS and quick-scanning EXAFS techniques under pressure.
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  • 5
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: SpoIVB is essential for intercompartmental signalling in the σK-checkpoint of Bacillus subtilis. SpoIVB is synthesized in the spore chamber and is the signal which activates proteolytic processing of pro-σK to its mature and active form σK. We show here that SpoIVB is a serine peptidase of the SA clan. Expression of SpoIVB in Escherichia coli has shown that SpoIVB is able to self-cleave into at least three discrete products, and in vitro studies have shown cleavage in trans. Autoproteolysis of SpoIVB is tightly linked to the initiation of the two developmental functions of this protein, signalling of pro-σK processing and a yet, uncharacterized, second function which is essential for the formation of heat-resistant spores. In B. subtilis, SpoIVB is synthesized as a zymogen and is subject to two levels of proteolysis. First, autoproteolysis generating intermediate products, at least one of which is proposed to be the active form, followed by processing by one or more enzymes to smaller species. This could provide a mechanism for switching off the active SpoIVB intermediate(s) and suggests a similarity to other proteolytic cascades such as those found in blood coagulation.
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  • 6
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Previous studies of gastrocnemius muscle reinnervation showed specific normalization of the proportion and diameter of fast type 2b muscle fibres following NT-3 delivery to the proximal stump of the cut sciatic nerve. Here, we investigate if normalization was related to greater improvement of muscle reinnervation of fast (extensor digitorum longus; EDL) than slow (soleus) motor units. NT-3-impregnated (NT-3 group) or plain fibronectin (FN group) mats were inserted into a sciatic nerve gap. Neuromuscular junctions (NMJs) labelled with TRITC-α-bungarotoxin were colabelled with calcitonin gene-related peptide (CGRP) or 4E2 antisera and imaged using confocal microscopy. CGRP and 4E2 were used as markers for newly reinnervated and structurally mature NMJs, respectively. At 40 days postsurgery, denervated NMJs in EDL and soleus muscles of both groups presented a 50% decrease of surface area due to decreased width. At day 80 in EDL, more NMJs were reinnervated by CGRP-immunoreactive terminals in the NT-3 (7.1%) than in the FN group (4.2%); there was no difference between groups for soleus. At 120 days, 4E2-immunoreactive NMJs were more numerous in EDL of the NT-3 (40.0%) than in the FN group (7.3%), unlike in soleus (NT-3, 1.6%; FN, 1.8%), and presented a partial size recovery. These results indicate that NT-3 preferentially improves reinnervation of fast muscles over slow muscle, although the mechanism of this improvement is still unclear.
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  • 7
    ISSN: 1572-9710
    Keywords: biodiversity ; decision support systems ; Ellenberg values ; monitoring ; regional scale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A method is presented for ecological assessment of botanical sample data from a nature reserve network. The approach uses regional floristic survey data for a specific biotope as a context for spatial and temporal comparison. Assessments are based upon floristic similarity to reference vegetation types and indicator scores that summarise multivariate plant species data in relation to important environmental gradients. The approach was implemented as a software tool using floristic survey data for soligenous mires in a UK region. Plant community monitoring data were assessed against reference communities from this regional baseline to illustrate the potential advantages of the method. These include; (a) allowing links to be made between multivariate plant species data and measurements of environmental drivers, (b) providing realistic assessments of spatial and temporal differences because comparisons are against typical values of indicator scores for the region, (c) providing the scope for setting realistic criteria for vegetation monitoring.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Manuscripta mathematica 101 (2000), S. 89-114 
    ISSN: 1432-1785
    Keywords: Mathematics Subject Classification (1991):53C20, 53C21, 53C25, 53C44
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract: The purpose of this paper is to construct a set of Riemannian metrics on a manifold X with the property that will develop a pinching singularity in finite time when evolved by Ricci flow. More specifically, let , where N n is an arbitrary closed manifold of dimension n≥ 2 which admits an Einstein metric of positive curvature. We construct a (non-empty) set of warped product metrics on the non-compact manifold X such that if , then a smooth solution , t∈[0,T) to the Ricci flow equation exists for some maximal constant T, 0〈T〈∞, with initial value , and where K is some compact set .
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  • 9
    ISSN: 1435-1285
    Keywords: Key words Single coronary artery ; coronary anomalies ; coronary angiography ; Schlüsselwörter ; Singuläre Kranzarterie ; Koronaranomalien ; Koronarangiographie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Koronaranomalien sind selten und in der Regel benigne. Es wird der Fall einer symptomatischen 53-jährigen Patientin mit einer singulären Kranzarterie und langem linken Hauptstamm vorgestellt, die mittels Mammaria-Bypass behandelt wurde.
    Notes: Summary Coronary anomalies are rare and usually benign. The case of a symptomatic woman aged 53 years is presented. Here the single coronary artery with a long left main trunk was treated by bypass grafting.
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  • 10
    Electronic Resource
    Electronic Resource
    Cambridge, Mass. : Berkeley Electronic Press (now: De Gruyter)
    ISSN: 1081-1826
    Source: Berkeley Electronic Press Academic Journals
    Topics: Mathematics , Economics
    Notes: There is now a great deal of empirical evidence that business cycle fluctuations contain asymmetries. I focus on a theoretical model intended to capture the nonlinear behavior of aggregate output following a large negative shock. Nonlinearity introduced by Bayesian updating and an information externality produces an economy in which the response to large negative shocks is an increase in future output. The expansionary effect is produced by the negative shock imparting information about what not to do.
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