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Portrait de la vaccination contre la COVID-19 chez les aînés au Québec. Rev Epidemiol Sante Publique 2022. [PMCID: PMC9340457 DOI: 10.1016/j.respe.2022.06.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Contexte Méthodes Résultats Discussion/Conclusion Déclaration de liens d'intérêts
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Phenotypic Plasticity and Selection: Nonexclusive Mechanisms of Adaptation. SCIENTIFICA 2016; 2016:7021701. [PMID: 27313957 PMCID: PMC4895053 DOI: 10.1155/2016/7021701] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 04/05/2016] [Accepted: 05/03/2016] [Indexed: 05/07/2023]
Abstract
Selection and plasticity are two mechanisms that allow the adaptation of a population to a changing environment. Interaction between these nonexclusive mechanisms must be considered if we are to understand population survival. This review discusses the ways in which plasticity and selection can interact, based on a review of the literature on selection and phenotypic plasticity in the evolution of populations. The link between selection and phenotypic plasticity is analysed at the level of the individual. Plasticity can affect an individual's response to selection and so may modify the end result of genetic diversity evolution at population level. Genetic diversity increases the ability of populations or communities to adapt to new environmental conditions. Adaptive plasticity increases individual fitness. However this effect must be viewed from the perspective of the costs of plasticity, although these are not easy to estimate. It is becoming necessary to engage in new experimental research to demonstrate the combined effects of selection and plasticity for adaptation and their consequences on the evolution of genetic diversity.
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3
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A physically based trunk soft tissue modeling for scoliosis surgery planning systems. Comput Med Imaging Graph 2015; 40:217-28. [DOI: 10.1016/j.compmedimag.2014.11.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Revised: 08/15/2014] [Accepted: 11/03/2014] [Indexed: 10/24/2022]
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4
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Interfacial magnetism by resonant X-ray reflectivity. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311098564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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5
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Spin structure in ultrathin fcc-Fe films on Cu(001). Acta Crystallogr A 2010. [DOI: 10.1107/s0108767310097771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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6
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Thigh Muscles’Responses Caused by a Single Combined Aerobic and Resistance Training Session in Healthy Young Men. Int J Sports Med 2010; 31:311-8. [DOI: 10.1055/s-0030-1248329] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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New model for magnetism in ultrathin fcc Fe on Cu(001). PHYSICAL REVIEW LETTERS 2009; 103:267202. [PMID: 20366339 DOI: 10.1103/physrevlett.103.267202] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2009] [Revised: 07/06/2009] [Indexed: 05/27/2023]
Abstract
Using soft-x-ray resonant magnetic scattering in combination with first-principles calculations for noncollinear magnetic configurations we present a new model of the magnetism in ultrathin fcc Fe films on Cu(001). We find the presence of blocks with robust magnetic structure, while the relative directions of the moments of different blocks are sensitive to the detailed atomic structure and temperature. The magnetic noncollinearity is directly demonstrated, which has not been possible so far.
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Self-consistency, spin-orbit and other advances in the FDMNES code to simulate XANES and RXD experiments. ACTA ACUST UNITED AC 2009. [DOI: 10.1088/1742-6596/190/1/012007] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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9
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Molecular Evolution within and between Self-Incompatibility Specificities. Mol Biol Evol 2009; 27:11-20. [DOI: 10.1093/molbev/msp224] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Charge and orbital correlations at and above the Verwey phase transition in magnetite. PHYSICAL REVIEW LETTERS 2008; 101:226401. [PMID: 19113492 DOI: 10.1103/physrevlett.101.226401] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2008] [Indexed: 05/27/2023]
Abstract
The subtle interplay among electronic degrees of freedom (charge and orbital orderings), spin and lattice distortion that conspire at the Verwey transition in magnetite (Fe3O4) is still a matter of controversy. Here, we provide compelling evidence that these electronic orderings are manifested as a continuous phase transition at the temperature where a spin reorientation takes place at around 130 K, i.e., well above TV approximately 121 K. The Verwey transition seems to leave the orbital ordering unaffected whereas the charge ordering development appears to be quenched at this temperature and the temperature dependence below TV is controlled by the lattice distortions. Finally, we show that the orbital ordering does not reach true long range (disorder), and the correlation length along the c-direction is limited to 100 angstroms.
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Depth magnetization profile of a perpendicular exchange coupled system by soft-x-ray resonant magnetic reflectivity. PHYSICAL REVIEW LETTERS 2008; 100:157202. [PMID: 18518146 DOI: 10.1103/physrevlett.100.157202] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2007] [Indexed: 05/26/2023]
Abstract
The magnetic profile across the interface of a perpendicular exchange coupled [NiO/CoO]3/Pt-Co/Pt(111) system is investigated. The magneto-optic Kerr effect reveals a strong coupling between the antiferromagnetic (AFM) oxide and the ferromagnetic (FM) Pt-Co layer, by an increasing coercivity and a rotation of the easy magnetization axis of the FM layer along the AFM spins. Soft x-ray resonant magnetic reflectivity is used to probe the spatial distribution of the out-of-plane magnetization inside the oxide above its ordering temperature. It extends over 1 nm and exhibits a change of sign.
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Prospective evaluation of glycoprotein IIb/IIIa inhibition with eptifibatide in patients undergoing percutaneous coronary intervention for ST-segment elevation myocardial infarction. CARDIOVASCULAR REVASCULARIZATION MEDICINE 2008. [DOI: 10.1016/j.carrev.2008.02.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Surface effects on the orbital order in the single-layered manganite La0.5Sr1.5MnO4. NATURE MATERIALS 2007; 6:972-976. [PMID: 18026106 DOI: 10.1038/nmat2061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2007] [Accepted: 10/15/2007] [Indexed: 05/25/2023]
Abstract
The question of how bulk electronic order is terminated at a surface is an intriguing one, and one with possible practical implications--for example in nanoscaled systems that may be characterized by their surface behaviour. One example of such order is orbital order, and in principle it should be possible to probe the termination of this order with surface X-ray scattering. Here, we report the first observation of the scattering arising from the termination of bulk orbital order at the surface of a crystal--so-called 'orbital truncation rods'. The measurements, carried out on a cleaved perovskite, La(0.5)Sr(1.5)MnO(4), reveal that whereas the crystallographic surface is atomically smooth, the orbital 'surface', which is observed through the atomic displacements caused by the orbital order, is much rougher, with a typical scale of the surface roughness of approximately 7 degrees A. Interestingly, the temperature dependence of this scattering shows evidence of a surface-induced second-order transition.
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Direct observation of oxygen superstructures in manganites. PHYSICAL REVIEW LETTERS 2007; 99:206403. [PMID: 18233167 DOI: 10.1103/physrevlett.99.206403] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2007] [Indexed: 05/25/2023]
Abstract
We report the observation of superstructures associated with the oxygen 2p states in two prototypical manganites using x-ray diffraction at the oxygen K edge. In the stripe order system Bi0.31Ca0.69MnO3, hole-doped O states are orbitally ordered, at the same propagation vector as the Mn orbital ordering, but no oxygen charge stripes are found at this periodicity. In La7/8Sr1/8MnO3, we observe a 2p charge ordering described by alternating hole-poor and hole-rich MnO planes that is consistent with some of the recent predictions.
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Postural implications of obtaining line-of-sight for seated operators of underground mining load-haul-dump vehicles. ERGONOMICS 2007; 50:192-207. [PMID: 17419154 DOI: 10.1080/00140130600951970] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Operators of load-haul-dump (LHD) vehicles use awkward postures that may be held statically and at extreme ranges of motion for long shift periods to spot hazards in underground mining. This study examined postural variables associated with three amounts of seat rotation intended to maximize line-of-sight during forward driving. Three different models, representing the 1st, 50th and 99th percentile male for height and weight, were positioned with appropriate hand and foot constraints in the virtual LHD cab modelled in Classic JACK v4.0. A total of 15 virtual movement strategies were developed to model the postural behaviour of typical workers and each virtual subject was tested, first with the seat in a neutral 0 degrees position and then with it rotated counter-clockwise to 20 degrees and 45 degrees . Results revealed that reductions in trunk rotation, trunk lateral bend and neck rotation were associated with the seat rotation intervention. The general relationship observed was that as seat rotation increased, view of critical visual attention locations and visible line-of-sight area increased while postural load variables decreased. For the most part, 20 degres of seat rotation was beneficial but 45 dgrees produced significantly greater changes to postural load and visible visual attention locations.
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Abstract
OBJECTIVE To compare cognitive behaviour therapy (CBT) with CBT plus medication; medication alone; and placebo in the treatment of adult obsessive-compulsive disorder (OCD). METHOD Forty-eight participants (43 completers) were recruited into two protocols. In the first protocol, 21 people with OCD were randomly allocated to either a standard medication (fluvoxamine) or standard placebo condition for a 5-month period. Both these groups subsequently received CBT for a further 5 months. In the second protocol, 22 people with OCD received CBT, one group was already stabilized on an antidepressant of choice; the second group was drug naïve. RESULTS All active treatments, but not the placebo, showed clinical improvement. There was no difference in treatment response to CBT regardless of whether participants had previously received medication or placebo. CONCLUSION CBT has a more specific antiobsessional effect than medication but CBT plus medication shows greatest overall clinical improvement in mood.
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Howarth S, Allison A, Grenier S, Cholewicki J, Mcgill SM. J Biomech 2006; 39:392-394. [DOI: 10.1016/j.jbiomech.2005.08.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Les modèles cellulaires 3D : un accès puissant à la physiologie cutanée et aux développements innovants de principes actifs cosmétiques. ACTA ACUST UNITED AC 2005; 53:618-26. [PMID: 16364814 DOI: 10.1016/j.patbio.2004.12.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2004] [Accepted: 12/03/2004] [Indexed: 10/25/2022]
Abstract
Two different anti-ageing cosmetic actives based respectively, on dermal compartment regeneration and on dermoepidermal reinforcement, have been developed using tissular engineering models. Conjointly use of different innovative three-dimensional models such as reconstructed dermis and skin built with human cells coming from variable aged donors allowed first, a better understanding of matrix modifications due to ageing and second, the screening of active ingredients highly targeted to reverse observed damages. The validity of such three-dimensional models has been then confirmed by in vivo studies on healthy volunteers.
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Charge-transfer excitations in the model superconductor HgBa(2)CuO(4+delta). PHYSICAL REVIEW LETTERS 2005; 95:217003. [PMID: 16384172 DOI: 10.1103/physrevlett.95.217003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2005] [Indexed: 05/05/2023]
Abstract
We report a Cu -edge resonant inelastic x-ray scattering (RIXS) study of charge-transfer excitations in the 2-8 eV range in the structurally simple compound HgBa(2)CuO(4+delta) at optimal doping (T(c)=96.5 K). The spectra exhibit a significant dependence on the incident photon energy which we carefully utilize to resolve a multiplet of weakly dispersive (<0.5 eV) electron-hole excitations, including a mode at 2 eV. The observation of this 2 eV excitation suggests the existence of a remnant charge-transfer gap deep in the superconducting phase. Quite generally, our results, which include additional data for the Mott insulator La(2)CuO(4), demonstrate the importance of exploring the incident photon-energy dependence of the RIXS cross section.
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d-d excitations in manganites probed by resonant inelastic x-ray scattering. PHYSICAL REVIEW LETTERS 2005; 94:047203. [PMID: 15783591 DOI: 10.1103/physrevlett.94.047203] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2004] [Indexed: 05/24/2023]
Abstract
We report a study of electronic excitations in manganites exhibiting a range of ground states, using resonant inelastic x-ray scattering (RIXS) at the Mn K edge. Excitations with temperature dependent changes correlated with the magnetism were observed as high as 10 eV. By calculating Wannier functions, and finite-q response functions, we associate this dependence with intersite d-d excitations. The calculated dynamical structure factor is found to be similar to the RIXS spectra.
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Resonant X-ray diffraction on manganites. Acta Crystallogr A 2004. [DOI: 10.1107/s010876730409885x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Soft x-ray resonant diffraction study of magnetic and orbital correlations in a manganite near half doping. PHYSICAL REVIEW LETTERS 2004; 92:237204. [PMID: 15245194 DOI: 10.1103/physrevlett.92.237204] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2003] [Indexed: 05/24/2023]
Abstract
We have utilized resonant x-ray diffraction at the Mn L(II,III) edges in order to directly compare magnetic and orbital correlations in Pr0.6Ca0.4MnO3. Comparing the widths of the magnetic and orbital diffraction peaks, we find that the magnetic correlation length exceeds that of the orbital order by nearly a factor of 2. Furthermore, we observe a large (approximately 3 eV) spectral weight shift between the magnetic and orbital resonant line shapes, which cannot be explained within the classic Goodenough picture of a charge-ordered ground state. To explain the shift, we calculate the orbital and magnetic resonant diffraction line shapes based on a relaxed charge-ordered model.
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The fibronectin network during aging: a missing cell connectivity. JOURNAL OF COSMETIC SCIENCE 2004; 55:215-6. [PMID: 15190895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
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Diffraction anomalous fine-structure spectroscopy at beamline BM2 at the European Synchrotron Radiation Facility. JOURNAL OF SYNCHROTRON RADIATION 2003; 10:435-444. [PMID: 14551444 DOI: 10.1107/s0909049503021332] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2003] [Accepted: 09/26/2003] [Indexed: 05/24/2023]
Abstract
Diffraction anomalous fine-structure (DAFS) spectroscopy uses resonant elastic X-rays scattering as an atomic, shell and site-selective probe that provides information on the electronic structure and the local atomic environment as well as on the long-range-ordered crystallographic structure. A DAFS experiment consists of measuring the Bragg peak intensities as a function of the energy of the incoming X-ray beam. The French CRG (Collaborative Research Group) beamline BM2-D2AM (Diffraction Diffusion Anomale Multi-longueurs d'Onde) at the ESRF (European Synchrotron Radiation Facility) has developed a state-of-the-art energy scan diffraction set-up. In this article the requirements for obtaining reliable DAFS data are presented and recent technical achievements are reported.
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On the importance of the 'smooth' energy variation in resonant diffraction spectra. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302094783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Abstract
An affinity study between the G protein of the visual photoreceptor, transducin, and eight different non-hydrolyzable GDP analogues is described. Imidodiphosphate derivatives have been shown to exhibit good affinities to transducin. This very important heterotrimeric G protein is shown to be highly restrictive with regard to structural modifications of the nucleotide at the pyrophosphate moiety, at the 3' position on ribose, as well as at the N1 position of the purine.
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Valence selective DAFS measurements of Mn in La1/3Ca2/3MnO3. JOURNAL OF SYNCHROTRON RADIATION 2001; 8:384-386. [PMID: 11512788 DOI: 10.1107/s0909049500017246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2000] [Accepted: 11/13/2000] [Indexed: 05/23/2023]
Abstract
The manganese perovskite system La(1-x)Ca(x)MnO3 displays a complex phase diagram of structural, magnetic, and transport properties with varying Ca concentration. At x = 2/3 and at low temperature, the system is antiferromagnetic with Mn4+ and Mn3+ ions occupying special positions in a charge-ordered supperlattice. The charge ordering transition at about 260 K is characterized by the appearance of satellite peaks around certain strong normal lattice reflections. The normal lattice reflections are due to scattering from planes containing Mn4+ and Mn3+ ions in nearly stoichiometric proportion, however the superlattice reflections are due to scattering from planes containing only Mn4+ ions. By measuring Diffraction Anomalous Fine-Structure spectral on a superlattice reflection and its associated normal lattice reflection, it is possible to isolate absorption-like spectra for the two Mn sites. Due to the weak intensity of these superlattice reflections, we were unable to obtain high quality near-edge spectra for the superlattice reflection measured. However, the data offer useful information about the local electronic structures of the two Mn ions.
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Glancing-angle diffraction anomalous fine structure of InAs quantum dots and quantum wires. JOURNAL OF SYNCHROTRON RADIATION 2001; 8:536-538. [PMID: 11512842 DOI: 10.1107/s0909049500016678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2000] [Accepted: 11/08/2000] [Indexed: 05/23/2023]
Abstract
We have performed Diffraction Anomalous Fine Structure measurements at the As K-edge of self-growth InAs/InP(001) Quantum Wires and InAs/GaAs(001) Quantum Dots. The samples have been grown by Molecular Beam Epitaxy and their equivalent thickness is of 2.5 monolayers. We have measured the (440) and (420) Bragg reflections in glancing-angle scattering geometry, at incidence angles close to the substrate critical angle. We demonstrate the feasibility of the experiment reporting, for the first time. Diffraction Anomalous Fine Structure spectra of such low coverage epitaxial layers, and we show that the analysis of the Diffraction Anomalous Fine Structure lineshape together with the analysis of oscillatory part of the signal, can provide information about composition and strain of the nanostructures.
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A Fe(x)Mn1-x/Ir(001) multilayer probed by EXAFS and DAFS. JOURNAL OF SYNCHROTRON RADIATION 2001; 8:886-888. [PMID: 11512967 DOI: 10.1107/s0909049501000346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2000] [Accepted: 01/03/2001] [Indexed: 05/23/2023]
Abstract
Diffraction Anomalous Fine Structure (DAFS) and EXAFS measurements have been performed on a (Fe0.7Mn0.3)/Ir(100)40 super-lattice at the K-edges of Fe and Mn. Theoretical EXAFS spectra have been refined: a slight difference in the first neighbor distance suggests a non homogeneous distribution of the Mn in the alloy. The smooth features of the DAFS spectra have been modeled to study the composition and the strain profile along the growth axis.
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Addition of wsp sequences to the Wolbachia phylogenetic tree and stability of the classification. J Mol Evol 2000; 51:374-7. [PMID: 11040288 DOI: 10.1007/s002390010099] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Wolbachia are symbiotic bacteria altering reproductive characters of numerous arthropods. Their most recent phylogeny and classification are based on sequences of the wsp gene. We sequenced wsp gene from six Wolbachia strains infecting six Trichogramma species that live as egg parasitoids on many insects. This allows us to test the effect of the addition of sequences on the Wolbachia phylogeny and to check the classification of Wolbachia infecting Trichogramma. The six Wolbachia studied are classified in the B supergroup. They confirm the monophyletic structure of the B Wolbachia in Trichogramma but introduce small differences in the Wolbachia classification. Modifications include the definition of a new group, Sem, for Wolbachia of T. semblidis and the merging of the two closely related groups, Sib and Kay. Specific primers were determined and tested for the Sem group.
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Diffraction Anomalous Fine Structure for probing local structure: strain, ordering, low dimensionality effects. Acta Crystallogr A 2000. [DOI: 10.1107/s0108767300022121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Abstract
Fluorescence in situ hybridization was tested to specifically detect symbionts of the genus Wolbachia in Trichogramma and to allow for semiquantitative estimations of symbiont abundance. Extraction solutions used for horizontal transfers of symbionts contain a high abundance of Wolbachia, but Wolbachia have a low and decreasing abundance in microinjected lines (transfected lines). Moreover, eggs of microinjected lines were shown to be polymorphic for the infection. In naturally infected lines, Wolbachia are localized at the posterior pole of the eggs; they are scattered during the early stages of larval development and then concentrated in the ovaries at the end of the female pupal development. Scattering and concentration are probably not active but rather the result of replications or morphogenesis. Conversely, Wolbachia are not concentrated at the posterior pole of eggs in microinjected lines. Comparison of the within-family and between-family variances of the symbiont abundance in a microinjected line did not lead us to conclude that this character shows a genetic variability.
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Telephone triage and risk management. QRC ADVISOR 2000; 16:9-12. [PMID: 11066553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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Determination of the depth of penetration of the alpha subunit of retinal G protein in membranes: a spectroscopic study. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1370:199-206. [PMID: 9545566 DOI: 10.1016/s0005-2736(97)00263-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
This paper reports the fluorescence quenching of the alpha subunit of retinal rod outer segment G protein (Gtalpha) by vesicles of brominated phospholipids. Two different brominated phospholipids with the bromine quencher groups attached at the 6-7 and 9-10 positions in one of the fatty acyl chains have been used to estimate the depth of penetration of the Gtalpha protein in the lipid vesicles using steady-state fluorescence quenching techniques. Our studies provide evidence of the interaction between Gtalpha protein, in its active conformation, with the lipid vesicles mimicking natural membranes. This study demonstrates that in vitro the distance between fluorescent tryptophan site of Gtalpha and the membrane surface is approximately 6.5 A.
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Comparative development and biochemical analyses of Trichogramma (Hymenoptera: Trichogrammatidae) grown in artificial media with hemolymph or devoid of insect components. Comp Biochem Physiol B Biochem Mol Biol 1995. [DOI: 10.1016/0305-0491(94)00224-i] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Analysis of some morphological and biochemical characteristics of the egg of the predaceous bugMacrolophus caliginosus (Het.: Miridae) during embryogenesis. ACTA ACUST UNITED AC 1994. [DOI: 10.1007/bf02372357] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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38
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[Dynamics of egg maturation in the parasitoid Lixophaga diatraeae (Diptera, Tachinidae) raised in a substitute host, Galleria mellonella (Lepidoptera, Pyralidae)]. REPRODUCTION, NUTRITION, DEVELOPPEMENT 1982; 22:523-35. [PMID: 7156496 DOI: 10.1051/rnd:19820409] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The content of the uterus and ovaries of L. diatraeae (an ovolarviparous tachinid fly) was studied by dissecting 121 females 0 to 25 days old. Several size classes of flies (p: small; m: medium; g: big) were used, weighing 10 to 12.5 mg, 12.5 to 13.5 mg, and 13.5 to 16 mg, respectively. The mean number of ovarioles per ovary, correlated to female size, was 12.1 for p as against 12.9 for m + g females. The total mean number of eggs and oocytes changed with female age and weight. For 0, 5, 10 and 15-day old females, this number was 56, 149, 158 and 202, respectively in g flies and 51, 128, 141 and 139, respectively, in p ones. To study egg maturation dynamics, we counted the total number of eggs + oocytes per p female (Y1), the eggs in the uterus (Y2), partially embryonated eggs (Y3), and entirely embryonated eggs (Y4). The experimental results were fitted to various age functions using a non-linear adjustment program. The models fitting each datum best were asymptotic functions of the form, Y = A [1-e-K(x-D)], where A is the asymptotic value, K a speed constant of the studied phenomenon and D age at the beginning of the phenomenon. At emergence time, each female contained a mean of 50 oocytes which passed into the uterus immediately after mating. Egg production continued for at least 10 days after emergence. The rate of embryogenesis seemed to be influenced by the number of eggs in the uterus and/or the age of the fly; it was high for the first eggs then decreased progressively. In our conditions, the first eggs with a planidium ready to hatch appeared at 10 days post-emergence. To obtain a maximum number of larvae in good health, it is better to dissect 12 to 18-day old females. The egg volume increases slightly during embryogenesis.
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Développement endoparasitaire et croissance pondérale larvaire du parasitoïdeLixophaga diatraeae [Dip.: Tachinidae] dans un hôte de substitution:Galleria mellonella [Lep.: Pyralidae]. ACTA ACUST UNITED AC 1980. [DOI: 10.1007/bf02377518] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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