2,418 research outputs found
Description of Atalodera gibbosa n. sp. and synonymization of Thecavermiculatus Robbins, 1978 to Atalodera Wouts and Sher, 1971 (Nemata : Heteroderidae)
#Atalodera gibbosa n. sp. est parasite de la graminée #Trachypogon montufori Nees (Poacées) au Brésil. Cette nouvelle espèce est caractérisée par : la grande longueur du stylet, des spicules, de la fente vulvaire et de la distance vulve-anus, ainsi que par le profil variable de la région vulvaire - continu, faible protubérance ou cône vulvaire typique - les oeufs et les juvéniles de deuxième stade (J2) éclos conservés dans le corps de la femelle, la présence d'un tube cloacal, les glandes oesophagiennes remplissant la cavité du corps des J2 enfin le champ latéral constitué de trois lignes atypiques. #Thecavermiculatus Robbins, 1978 est synonymisé à #Atalodera Wouts & Sher, 1971. Au champ, les populations du nématode sont élevées et fluctuantes pendant la saison humide, tandis qu'elles sont faibles et la reproduction réduite durant la saison sèche pendant laquelle les J2 survivent à l'intérieur du corps de la femelle (dans les oeufs ou libres après éclosion). (Résumé d'auteur
Ultrastructure of the body cuticle of Atalodera gibbosa Souza & Huang, 1994 (Tylenchida : Heteroderinae)
L'ultrastructure de la cuticule d'#Atalodera gibbosa$ Souza & Huang, 1994 est décrite. La cuticule est composée des couches A, B, C et D qui peuvent être subdivisées en couches supplémentaires désignées par des sous-exposants. Les couches A1, A2 et A3 sont semblables à celles des autres Heteroderidae. Une nouvelle couche - A4 - signalée chez les juvéniles de deuxième stade (J2). La couche B est normale chez les J2 et les mâles, alors que chez les femelles, elle est caractérisée par une disposition particulière de fibres parallèles - par rapport à la surface de la cuticule - et de fibres radiales. Les troisième et quatrième stades juvéniles présentent une couche C structurée et une couche D néo-formée. Les jeunes femelles possèdent une couche D normale, mais chez les femelles matures existe une couche supplémentaire, D2, rapportée ici pour la première fois, et formée de fibres paraboliques disposées en deux strates minces. (Résumé d'auteur
Clonal spread of SCCmec type IV methicillin-resistant Staphylococcus aureus between community and hospital
ABSTRACTThe staphylococcal chromosome cassette (SCC)mec types of 382 hospital-acquired methicillin-resistant Staphylococcus aureus (HA-MRSA) isolates in Taiwan were analysed over a 7-year period (1999–2005). There was an abrupt increase in SCCmec type IV in HA-MRSA during 2005. The molecular epidemiology of a subset (n = 69) of HA-MRSA isolates with SCCmec types III, IV or V was characterised and compared with that of community-acquired MRSA (CA-MRSA) (n = 26, collected during 2005). Pulsed-field gel electrophoresis revealed three major pulsotypes (A, B and C) and 15 minor clones. Pulsotypes B and C, which contained isolates carrying SCCmec types IV and V, respectively, included both CA-MRSA and HA-MRSA isolates. Among 24 toxin genes analysed, five genes had significant differential distribution between CA-MRSA and SCCmec type III HA-MRSA. Furthermore, among SCCmec type IV isolates, the seb gene was detected more commonly in HA-MRSA. Analysis of representative members of the three major pulsotypes by multilocus sequence typing revealed two sequence types (STs), namely ST239 (SCCmec III) and ST59 (SCCmec IV or SCCmec V). This suggests that ST59:SCCmec IV, which is usually community-acquired, has become an important nosocomial pathogen in the hospital studied
Density Effect on Hadronization of a Quark Plasma
The hadronization cross section in a quark plasma at finite temperature and
density is calculated in the framework of Nambu--Jona-lasinio model with
explicit chiral symmetry breaking. In apposition to the familiar temperature
effect, the quark plasma at high density begins to hadronize suddenly. It leads
to a sudden and strong increase of final state pions in relativistic heavy ion
collisions which may be considered as a clear signature of chiral symmetry
restoration.Comment: Latex2e, 11 pages, 7 Postscript figures, submitted to Phys. Rev.
Electron Spin-Lattice Relaxation of Er3+ ions in Er0.01Y0.99Ba2Cu3Ox
The temperature dependence of the electron spin-lattice relaxation SLR was
studied in Er0.01Y0.99Ba2Cu3Ox compounds. The data derived from the electron
spin resonance ESR and SLR measurements were compared to those from inelastic
neutron scattering studies. SLR of Er3+ ions in the temperature range from 20 K
to 65 K can be explained by the resonant phonon relaxation process with the
involvement of the lowest excited crystalline-electric-field electronic states
of Er3+. These results are consistent with a local phase separation effects.
Possible mechanisms of the ESR line broadening at lower temperatures are
discussed. Keywords: YBCO; EPR; ESR; Electron spin-lattice relaxation time, T ;
Crystalline-electric-fieldComment: 6 pages, 4 figure
The use of rapid prototyping in the design of a customised ankle brace structure for ACL injury risk reduction.
Rapid prototyping, or additive manufacturing, is becoming more useful in creating functional prototypes, especially when customisation is required. This paper explores the use of three-dimensional (3D) printing in designing a customised ankle brace structure for anterior cruciate ligament (ACL) injury risk reduction. A new process is proposed to obtain ankle flexion angles and the corresponding foot surface strain associated with high ACL injury risks through motion analysis. This data is used in the design of the customised ankle brace structure and printed using rapid prototyping. One customised ankle brace structure was printed and tested to demonstrate this proposed framework. The ankle flexion range of motion (ROM) was significantly reduced in the high-risk ankle positions with the ankle brace structure. Rapid prototyping could thus be used to design customised ankle brace structures and this is useful in reducing fabrication time and complexity of customisation. © 2013 Taylor & Francis
Spectral Function of Quarks in Quark Matter
We investigate the spectral function of light quarks in infinite quark matter
using a simple, albeit self-consistent model. The interactions between the
quarks are described by the SU(2) Nambu--Jona-Lasinio model. Currently mean
field effects are neglected and all calculations are performed in the chirally
restored phase at zero temperature. Relations between correlation functions and
collision rates are used to calculate the spectral function in an iterative
process.Comment: final version, published in PRC; 15 pages, RevTeX
Spin Transfer from a Ferromagnet into a Semiconductor through an Oxide barrier
We present results on the magnetoresistance of the system Ni/Al203/n-doped
Si/Al2O3/Ni in fabricated nanostructures. The results at temperature of 14K
reveal a 75% magnetoresistance that decreases in value up to approximately 30K
where the effect disappears. We observe minimum resistance in the antiparallel
configurations of the source and drain of Ni. As a possibility, it seems to
indicate the existence of a magnetic state at the Si/oxide interface. The
average spin diffusion length obtained is of 650 nm approximately. Results are
compared to the window of resistances that seems to exist between the tunnel
barrier resistance and two threshold resistances but the spin transfer seems to
work in the range and outside the two thresholds
Search for Invisible Decays of and in and
Using a data sample of decays collected with the BES
II detector at the BEPC, searches for invisible decays of and
in to and are performed.
The signals, which are reconstructed in final states, are used
to tag the and decays. No signals are found for the
invisible decays of either or , and upper limits at the 90%
confidence level are determined to be for the ratio
and for . These are the first
searches for and decays into invisible final states.Comment: 5 pages, 4 figures; Added references, Corrected typo
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