Emission cross sections for neutral xenon impacted by Xe+ and Xe2+

Ion impact emission cross sections for eleven transitions from the 5p56p configuration to the 5p56s configuration of neutral xenon occurring in the spectral region between 700 nm and 1000 nm have been measured experimentally. Collisions between both singly- and doublyionized xenon and neutral xenon have been studied. These cross sections are of primary use in the development of a spectrographic diagnostic for Hall effect thruster plasma. A detailed discussion of the experimental methods and the subsequent data reduction is included. The results are presented and the importance of these data for spectrographic emission models of Hall effect thruster plasmas is discussed.

Piezoelectric alveolar ridge-splitting technique with simultaneous implant placement: a cohort study with 2-year radiographic results

PURPOSE Extended grafting procedures in atrophic ridges are invasive and time-consuming and increase cost and patient morbidity. Therefore, ridge-splitting techniques have been suggested to enlarge alveolar crests. The aim of this cohort study was to report techniques and radiographic outcomes of implants placed simultaneously with a piezoelectric alveolar ridge-splitting technique (RST). Peri-implant bone-level changes (ΔIBL) of implants placed with (study group, SG) or without RST (control group, CG) were compared. MATERIALS AND METHODS Two cohorts (seven patients in each) were matched regarding implant type, position, and number; superstructure type; age; and gender and received 17 implants each. Crestal implant bone level (IBL) was measured at surgery (T0), loading (T1), and 1 year (T2) and 2 years after loading (T3). For all implants, ΔIBL values were determined from radiographs. Differences in ΔIBL between SG and CG were analyzed statistically (Mann-Whitney U test). Bone width was assessed intraoperatively, and vertical bone mapping was performed at T0, T1, and T3. RESULTS After a mean observation period of 27.4 months after surgery, the implant survival rate was 100%. Mean ΔIBL was -1.68 ± 0.90 mm for SG and -1.04 ± 0.78 mm for CG (P = .022). Increased ΔIBL in SG versus CG occurred mainly until T2. Between T2 and T3, ΔIBL was limited (-0.11 ± 1.20 mm for SG and -0.05 ± 0.16 mm for CG; P = .546). Median bone width increased intraoperatively by 4.7 mm. CONCLUSIONS Within the limitations of this study, it can be suggested that RST is a well-functioning one-stage alternative to extended grafting procedures if the ridge shows adequate height. ΔIBL values indicated that implants with RST may fulfill accepted implant success criteria. However, during healing and the first year of loading, increased IBL alterations must be anticipated.

Female preference for male color is necessary and sufficient for assortative mating in 2 cichlid sister species

A critical step for speciation in the face of gene flow is the origination of reproductive isolation. The evolution of assortative mating greatly facilitates this process. Assortative mating can be mediated by one or multiple cues across an array of sensory modalities. We here explore possible cues that may underlie female mate choice in a sympatric species pair of cichlid fish from Lake Victoria, Pundamilia pundamilia and Pundamilia nyererei. Previous studies identified species-specific female preferences for male coloration, but effects of other cues could not be ruled out. Therefore, we assessed female choice in a series of experiments in which we manipulated visual (color) and chemical cues. We show that the visibility of differences in nuptial hue (i.e., either blue or red) between males of the 2 species is necessary and sufficient for assortative mating by female mate choice. Such assortment mediated by a single cue may evolve relatively quickly, but could make reproductive isolation vulnerable to environmental changes. These findings confirm the important role of female mate choice for male nuptial hue in promoting the explosive speciation of African haplochromine cichlids.

Imaginería del color en Petronio : De la Myrtea Gausapa (21-2) al Myrthus Florens (131.9)

El uso de imágenes ubica al Satiricón de Petronio como una obra de intersección (canón, cardo) entre la literatura antigua precedente griega y latina, y las composiciones posteriores de gran importancia en el surgimiento de la ficción en prosa moderna en el Renacimiento. Las imágenes visuales y de color en Petronio contribuyen notablemente a esa configuración, mientras que un estudio del léxico correspondiente, a partir en especial de las ediciones humanísticas de la obra, pueden sin duda arrojar luz sobre aspectos textuales aún no resueltos en esa obra maestra de la literatura latina

Imaginería del color en Petronio : De la Myrtea Gausapa (21-2) al Myrthus Florens (131.9)

El uso de imágenes ubica al Satiricón de Petronio como una obra de intersección (, cardo) entre la literatura antigua precedente griega y latina, y las composiciones posteriores de gran importancia en el surgimiento de la ficción en prosa moderna en el Renacimiento. Las imágenes visuales y de color en Petronio contribuyen notablemente a esa configuración, mientras que un estudio del léxico correspondiente, a partir en especial de las ediciones humanísticas de la obra, pueden sin duda arrojar luz sobre aspectos textuales aún no resueltos en esa obra maestra de la literatura latina

Imaginería del color en Petronio : De la Myrtea Gausapa (21-2) al Myrthus Florens (131.9)

El uso de imágenes ubica al Satiricón de Petronio como una obra de intersección (canón, cardo) entre la literatura antigua precedente griega y latina, y las composiciones posteriores de gran importancia en el surgimiento de la ficción en prosa moderna en el Renacimiento. Las imágenes visuales y de color en Petronio contribuyen notablemente a esa configuración, mientras que un estudio del léxico correspondiente, a partir en especial de las ediciones humanísticas de la obra, pueden sin duda arrojar luz sobre aspectos textuales aún no resueltos en esa obra maestra de la literatura latina

Imaginería del color en Petronio : De la Myrtea Gausapa (21-2) al Myrthus Florens (131.9)

El uso de imágenes ubica al Satiricón de Petronio como una obra de intersección (canón, cardo) entre la literatura antigua precedente griega y latina, y las composiciones posteriores de gran importancia en el surgimiento de la ficción en prosa moderna en el Renacimiento. Las imágenes visuales y de color en Petronio contribuyen notablemente a esa configuración, mientras que un estudio del léxico correspondiente, a partir en especial de las ediciones humanísticas de la obra, pueden sin duda arrojar luz sobre aspectos textuales aún no resueltos en esa obra maestra de la literatura latina

Study on the last deglaciation section of sediment core GeoB6211-2

The North Atlantic Ocean underwent an abrupt temperature increase of 9 °C at high latitudes within a couple of decades during the transition from Heinrich event 1 (H1) to the Bølling warm event, but the mechanism responsible for this warming remains uncertain. Here we address this issue, presenting high-resolution last deglaciation planktic and benthic foraminiferal records of temperature and oxygen isotopic composition of seawater (d18OSW) for the subtropical South Atlantic. We identify a warming of ~6.5 °C and an increase in d18Osw of 1.2 per mil at the permanent thermocline during the transition, and a simultaneous warming of ~3.5 °C with no significant change in d18Osw at intermediate depths. Most of the warming can be explained by tilting the South Atlantic east-west isopycnals from a flattened toward a steepened position associated with a collapsed (H1) and strong (Bølling) Atlantic meridional overturning circulation (AMOC). However, this zonal seesaw explains an increase of just 0.3 per mil in permanent thermocline d18Osw. Considering that d18Osw at the South Atlantic permanent thermocline is strongly influenced by the inflow of salty Indian Ocean upper waters, we suggest that a strengthening in the Agulhas leakage took place at the transition from H1 to the Bølling, and was responsible for the change in d18Osw recorded in our site. Our records high-light the important role played by Indian-Atlantic interocean exchange as the trigger for the resumption of the AMOC and the Bølling warm event. of the AMOC and the Bølling warm event.