100,715 research outputs found
The Epidemiology of the Human T-Cell Leukemia Virus Type 1 (HTLV-1)
No full textKrämer A, Stock C, Seydel J. Die Epidemiologie des humanen T-Zell-Leukämievirus Typ 1 (HTLV-1). Aids-Forschung. 1995;10:571-584
Data for: Neutron spectroscopy on protein solutions employing backscattering with an increased energy range
No full textHDF files of QENS spectra recorded using the BATS option of IN16B on a solution of bovine serum albumin proteins in D2O, during commissioning of the BATS option, in March/April 2018 (ILL reactor cycle 2018-1), and associated calibration spectra (pure D2O, empty can, and Vanadium), compressed in a single zip file
Glass surfaces: Freezing of capillary waves?
No full textInternational audienceThis contribution reports on the first in situ investigation of a surface during the transition from the liquid to the glass state using X-ray scattering. X-ray reflectivity experiments were carried out to determine the surface roughness caused by capillary waves, and X-ray photon correlation spectroscopy (XPCS) was employed to observe the lateral dynamics of these capillary waves. A dedicated sample cell was developed to homogeneously cool a circular trough with 140 mm diameter and 4.5 mm depth filled with the model glass former glycerol, reaching temperatures well below 200K with the high temperature stability required for XPCS experiments. The presentation introduces the physics of the glass transition, of capillary waves, and of surface-sensitive X-ray scattering. It shows schematics and photographs of both the sample cell and of the laboratory liquid surface X-ray reflectometer equally developed during this project to test and optimize the sample cell. It reports on the results from both the X-ray reflectivity and XPCS experiments carried out using synchrotron radiation at the National Synchrotron Light Source (NSLS) and European Synchrotron Radiation Facility (ESRF). References: T. Seydel et al., Phys.Rev.B vol. 63, p. 073409 (2001) and vol. 65, p. 184207 (2002); T. Seydel et al., Rev.Sci.Instrum. vol. 74, p. 4033 (2003
Glass surfaces: Freezing of capillary waves?
No full textInternational audienceThis contribution reports on the first in situ investigation of a surface during the transition from the liquid to the glass state using X-ray scattering. X-ray reflectivity experiments were carried out to determine the surface roughness caused by capillary waves, and X-ray photon correlation spectroscopy (XPCS) was employed to observe the lateral dynamics of these capillary waves. A dedicated sample cell was developed to homogeneously cool a circular trough with 140 mm diameter and 4.5 mm depth filled with the model glass former glycerol, reaching temperatures well below 200K with the high temperature stability required for XPCS experiments. The presentation introduces the physics of the glass transition, of capillary waves, and of surface-sensitive X-ray scattering. It shows schematics and photographs of both the sample cell and of the laboratory liquid surface X-ray reflectometer equally developed during this project to test and optimize the sample cell. It reports on the results from both the X-ray reflectivity and XPCS experiments carried out using synchrotron radiation at the National Synchrotron Light Source (NSLS) and European Synchrotron Radiation Facility (ESRF). References: T. Seydel et al., Phys.Rev.B vol. 63, p. 073409 (2001) and vol. 65, p. 184207 (2002); T. Seydel et al., Rev.Sci.Instrum. vol. 74, p. 4033 (2003
A preliminary investigation of the associations between digit ratio and women’s perception of men’s dance
No full textRecent research has revealed that variation in human dancing ability is related to levels of fluctuating asymmetry, and that women rate symmetrical male dancers more positively. We measured the lengths of the 2nd (index) and 4th (ring) finger in a sample of young men and recorded short digital video clips of their dance movements. A panel of 104 female judges rated 12 clips of men with the lowest and highest finger-length ratios (2D:4D) for attractiveness, dominance, and masculinity. We found that dances by men with low (masculinised) 2D:4D ratios were rated significantly higher on attractiveness, dominance, and masculinity than dancers with high (feminised) 2D:4D. There were no significant differences between the two groups of dancers for age and other physical measures such as waist-to-hip ratio (WHR) and body-mass-index (BMI). Since there is evidence that finger-length ratios negatively correlate with testosterone exposure in utero, male dancing abilities may be organized early during development. Moreover, women’s ability to perceive differences in dance movement of men with low and high 2D:4D may indicate that dance provides some cues to phenotypic condition, relevant for sexual selection
Digit ratio and hand-grip strength in German and Mizos men: cross-cultural evidence for an organizing effect of prenatal testosterone on strength
No full textThe ratio of the length of the second and fourth digits (2D:4D), a putative proxy of prenatal testosterone (PT), is correlated with measures of physical fitness. The relationship between the organizing effect of PT on physical fitness is likely to arise as a response to intrasexual male competition for females. Physical strength is also likely to be important in intrasexual conflict, but nothing is known concerning the relationship between 2D:4D and strength. The strength of an individual is strongly influenced by body size, and 2D:4D is strongly dependent on ethnicity. We present evidence that strength, as measured from hand-grip strength, is related to 2D:4D in samples from two ethnic groups (52 Caucasian men from Germany, and 88 Oriental Mizos men from northeast India) which differed markedly in size. We found that 1) the German men were heavier and stronger, but had higher 2D:4D (lower PT) than the Mizos men; 2) a median split for grip strength into low (LGS) and high (HGS) groups showed that for right-hand 2D:4D (but not left-hand 2D:4D), the LGS men had higher 2D:4D than the HGS men; and 3) the relationships between right 2D:4D and grip strength were independent of ethnicity, age, height, and weight. Measures of grip strength correlate strongly with strength in other muscle groups, so we conclude that PT may have an early organizing effect on strength in men, and this is likely to be widespread in human groups
Male facial appearance signals physical strength to women
No full textPrevious studies showed that male faces with extreme features that are likely to be associated with testosterone (T) are perceived as dominant and masculine. Women were reported to prefer masculinized male faces, as they may consider T markers to be an "honest" indication of good health. However, it is also likely that female preferences for certain male faces arise from the fact that dominant- and masculine-looking males are signaling characteristics which may be beneficial in intrasexual conflict, and thereby also indicate potential achievers of high status, an important factor in female mate selection. Although numerous studies were built on this assumption, nothing is known about the relationship between perceived facial dominance and physical strength in men. We measured hand-grip strength, as a measure of overall physical strength, in a sample of 32 male students, and recorded age, body weight, and height. Seventy-nine women rated facial images of these men for dominance, masculinity, and attractiveness. After controlling for age and body weight, hand-grip strength was found to correlate significantly positively with all three measures. The present data thus support the supposition that a male's physical strength is also signaled via facial characteristics of dominance and masculinity, which are considered attractive by women
The effect of discretization on homoclinic orbits
No full textBeyn W-J. The effect of discretization on homoclinic orbits. In: Küpper T, Seydel R, Troger H, eds. Bifurcation: analysis, algorithms, applications: proceedings of the conference at the University of Dortmund, August 18 - 22, 1986. International series of numerical mathematics. Vol 79. Basel [u.a.]: Birkhäuser; 1987: 1-8
Observation of heterodyne mixing in surface x-ray photon correlation spectroscopy experiments
No full textWe report measurements of propagating capillary waves on a liquid water surface at T=5 degrees C with x-ray photon correlation spectroscopy. The experiment has been performed under grazing incidence conditions with an incoming x-ray beam below the critical angle of total external reflection. In the q region investigated the measured intensity-intensity autocorrelation functions of the liquid water surface were found to be heterodyne signals, i.e., a combination of first- and second-order correlation functions g(1)(tau) and g(2)(tau)
Letter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
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