78 research outputs found
Sub-Doppler laser cooling of fermionic 40K atoms in three-dimensional gray optical molasses
We demonstrate sub-Doppler cooling of 40K on the D_1 atomic transition. Using
a gray molasses scheme, we efficiently cool a compressed cloud of 6.5x10^8
atoms from ~ 4\mK to 20uK in 8 ms. After transfer in a quadrupole magnetic
trap, we measure a phase space density of ~10^-5. This technique offers a
promising route for fast evaporation of fermionic 40K.Comment: 6 pages; 7 figures; submitted to EP
Analog Simulation of Weyl Particles with Cold Atoms
We study theoretically, numerically, and experimentally the relaxation of a
collisionless gas in a quadrupole trap after a momentum kick. The
non-separability of the potential enables a quasi thermalization of the single
particle distribution function even in the absence of interactions.
Suprinsingly, the dynamics features an effective decoupling between the strong
trapping axis and the weak trapping plane. The energy delivered during the kick
is redistributed according to the symmetries of the system and satisfies the
Virial theorem, allowing for the prediction of the final temperatures. We show
that this behaviour is formally equivalent to the relaxation of massless
relativistic Weyl fermions after a sudden displacement from the center of a
harmonic trap
Proteomics unravels the regulatory mechanisms in human tears following acute renouncement of contact lens use : a comparison between hard and soft lenses
Contact lenses (CLs) provide a superior alternative to spectacles. Although beneficial, the global burden of ocular dysfunctions attributed to regular use of CLs remains a topic of much challenge in ophthalmic research owing to debilitating clinical repercussions on the ocular surface, which are often manifested as breach in tear film integrity. This study elucidated the intricate tear proteome changes attributed to the use of different CLs (hard and soft) and unravelled, for the first time, the restorative mechanisms of several protein clusters following acute renouncement of CL use employing the label-free mass spectrometry-based quantitative proteomics approach. The expression patterns of certain proteins clusters were specific to the use of a particular lens type and a large majority of these actively regulates cell death and survival and, modulates cellular movement on the ocular surface. Noteworthy, CL use also evoked a significant upregulation of glycolytic enzymes associated with hypoxia and corresponding cognate metabolic pathways, particularly glucose metabolism and FXR/RXR pathways. Importantly, the assessment of CL renouncement unravelled the restorative properties of several clusters of proteins involved mainly in organismal injury and abnormalities and, cellular function and maintenance. These proteins play key roles in restoring tear homeostasis and wound-healing mechanisms post-CL use-elicited injury
Rickettsia helvetica in Dermacentor reticulatus Ticks
We report on the molecular evidence that Dermacentor reticulatus ticks in Croatia are infected with Rickettsia helvetica (10%) or Rickettsia slovaca (2%) or co-infected with both species (1%). These findings expand the knowledge of the geographic distribution of R. helvetica and D. reticulatus ticks
Puritans, visionaries and survivors
All readings take place in the here-and-now, even of texts written back there and then. Nowhere in management and organization theory has this been truer of anyone than Max Weber. Unread in English during his lifetime, it was nearly 30 years after his death before his ideas had much impact. When they did, they were read in a context and tradition years away from those in which they were conceived. And, ever since, they have been subject to systematic reinterpretation on the one hand and neglect on the other. The paper addresses how one might use Weber today, in terms of his sensitivity to current issues, such as sustainability, as well as the still largely unacknowledged foundation that Weber constructed for contemporary cultural studies. The paper will bring these two themes together, using analysis of contemporary equivalents to the popular culture that formed the basis for some of Weber's own investigations. Copyright © 2005 SAGE Publications
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