1,208 research outputs found
Feedback cooling of a cantilever's fundamental mode below 5 mK
We cool the fundamental mechanical mode of an ultrasoft silicon cantilever
from a base temperature of 2.2 K to 2.9 +/- 0.3 mK using active optomechanical
feedback. The lowest observed mode temperature is consistent with limits
determined by the properties of the cantilever and by the measurement noise.
For high feedback gain, the driven cantilever motion is found to suppress or
"squash" the optical interferometer intensity noise below the shot noise level.Comment: 4 pages, 6 figure
Nuclear spin relaxation induced by a mechanical resonator
We report on measurements of the spin lifetime of nuclear spins strongly
coupled to a micromechanical cantilever as used in magnetic resonance force
microscopy. We find that the rotating-frame correlation time of the statistical
nuclear polarization is set by the magneto-mechanical noise originating from
the thermal motion of the cantilever. Evidence is based on the effect of three
parameters: (1) the magnetic field gradient (the coupling strength), (2) the
Rabi frequency of the spins (the transition energy), and (3) the temperature of
the low-frequency mechanical modes. Experimental results are compared to
relaxation rates calculated from the spectral density of the magneto-mechanical
noise.Comment: 4 pages, 4 figure
Genetic conservation within managed forests in Amazonia: dendrogene project.
Editado por Bernd Degen, Marilyn D. Loveless e Antoine Kremer
Recommended from our members
Impact of Molecular Architecture and Adsorption Density on Adhesion of Mussel-Inspired Surface Primers with Catechol-Cation Synergy.
Marine mussels secrete proteins rich in residues containing catechols and cationic amines that displace hydration layers and adhere to charged surfaces under water via a cooperative binding effect known as catechol-cation synergy. Mussel-inspired adhesives containing paired catechol and cationic functionalities are a promising class of materials for biomedical applications, but few studies address the molecular adhesion mechanism(s) of these materials. To determine whether intramolecular adjacency of these functionalities is necessary for robust adhesion, a suite of siderophore analog surface primers was synthesized with systematic variations in intramolecular spacing between catechol and cationic functionalities. Adhesion measurements conducted with a surface forces apparatus (SFA) allow adhesive failure to be distinguished from cohesive failure and show that the failure mode depends critically on the siderophore analog adsorption density. The adhesion of these molecules to muscovite mica in an aqueous electrolyte solution demonstrates that direct intramolecular adjacency of catechol and cationic functionalities is not necessary for synergistic binding. However, we show that increasing the catechol-cation spacing by incorporating nonbinding domains results in decreased adhesion, which we attribute to a decrease in the density of catechol functionalities. A mechanism for catechol-cation synergy is proposed based on electrostatically driven adsorption and subsequent binding of catechol functionalities. This work should guide the design of new adhesives for binding to charged surfaces in saline environments
Promiscuity and high level of multiple paternity in common wall lizards (Podarcis muralis): data from microsatellite markers
Little is known about themating system of the common wall lizard Podarcis muralis. Behavioural and observational data have demonstrated that females frequently mate with multiple males. However, the possible occurrence of multiple paternity has never been investigated. By using microsatellite paternity analysis in a wild population, we document this species indeed mate promiscuously and these matings resulted in multiple paternity in at least 87% of the clutches examined. [Authors]]]>
Lizards ; Sexual Behavior, Animal ; Microsatellite Repeats
eng
oai:serval.unil.ch:BIB_17EAFC1A4DE4
2022-05-07T01:11:25Z
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https://serval.unil.ch/notice/serval:BIB_17EAFC1A4DE4
Encapsulation of neurotrophic factor-releasing cells for the treatment of neurodegenerative diseases.
info:doi:10.3233/RNN-1995-81215
info:eu-repo/semantics/altIdentifier/doi/10.3233/RNN-1995-81215
info:eu-repo/semantics/altIdentifier/pmid/21551809
Aebischer, P.
Tan, S.A.
Déglon, N.
Heyd, B.
Zurn, A.
Baetge, E.
Sagot, Y.
Kato, A.
info:eu-repo/semantics/article
article
1995
Restorative Neurology and Neuroscience, vol. 8, no. 1, pp. 65-66
info:eu-repo/semantics/altIdentifier/pissn/0922-6028
urn:issn:0922-6028
eng
oai:serval.unil.ch:BIB_17EB1DA9D7D0
2022-05-07T01:11:25Z
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https://serval.unil.ch/notice/serval:BIB_17EB1DA9D7D0
De la représentation des assurés devant le tribunal arbitral des assurances institué par l'article 89 LAMal
Duc, J.-L.
info:eu-repo/semantics/article
article
2011
Pratique juridique actuelle (AJP/PJA), vol. 20, no. 1, pp. 85-89
info:eu-repo/semantics/altIdentifier/pissn/1660-3362
fre
oai:serval.unil.ch:BIB_17EBAE571092
2022-05-07T01:11:25Z
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https://serval.unil.ch/notice/serval:BIB_17EBAE571092
Relations between bone densitometry of the forearm and quantitative ultrasound of the calcaneus in elderly women
Krieg, M.A.
Bovard, E.
Cornuz, J.
Häuselmann, H.J.
Burckhardt, P.
info:eu-repo/semantics/conferenceObject
inproceedings
1998
2nd Joint Meeting of the American Society for Bone and Mineral Research and the International Bone and Mineral Society, vol. 23, pp. F476
info:eu-repo/semantics/altIdentifier/isbn/8756-3282
eng
oai:serval.unil.ch:BIB_17EC19A8E9D8
2022-05-07T01:11:25Z
urnserval
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https://serval.unil.ch/notice/serval:BIB_17EC19A8E9D8
Culture de la performance et abus sexuels dans le sport
Ohl, Fabien
Schoch, Lucie
info:eu-repo/semantics/article
article
2020-02-05
Le Temps
fre
https://serval.unil.ch/resource/serval:BIB_17EC19A8E9D8.P001/REF.pdf
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info:eu-repo/semantics/altIdentifier/urn/urn:nbn:ch:serval-BIB_17EC19A8E9D88
info:eu-repo/semantics/submittedVersion
info:eu-repo/semantics/restrictedAccess
Restricted: indefinite embargo
Copying allowed only for non-profit organizations
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application/pdf
oai:serval.unil.ch:BIB_17ED39C35D5A
2022-05-07T01:11:25Z
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Lectures et plaisirs : pour une reconceptualisation des modes et des types de lecture littéraire
info:doi:10.4000/edl.610
info:eu-repo/semantics/altIdentifier/doi/10.4000/edl.610
http://www.unil.ch/edl/fr/home.html
Bemporad, C.
info:eu-repo/semantics/article
article
2014
Etudes de Lettres. Revue de la Faculté des Lettres de l'Université de Lausanne, no. 1, pp. 65-83
info:eu-repo/semantics/altIdentifier/pissn/2296-5084
fre
X2074055640/507
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2022-05-11T12:07:00Z
http://serval.unil.ch/oaiprovider/
oai:serval.unil.ch:BIB_17ED46F3E2BE
2022-05-07T01:11:25Z
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https://serval.unil.ch/notice/serval:BIB_17ED46F3E2BE
Stapled Porcine Pericardium Displays Lower Infectivity In Vitro Than Native and Sutured Porcine Pericardium.
info:doi:10.1016/j.jss.2021.11.013
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jss.2021.11.013
info:eu-repo/semantics/altIdentifier/pmid/34973547
Del Tatto, B.
Le Roy, D.
Lambelet, M.
Corpataux, J.M.
Chakfé, N.
Giulieri, S.
Allagnat, F.
Roger, T.
Saucy, F.
info:eu-repo/semantics/article
article
2022-04
The Journal of surgical research, vol. 272, pp. 132-138
info:eu-repo/semantics/altIdentifier/eissn/1095-8673
urn:issn:0022-4804
<![CDATA[Biological xenografts using tubulized porcine pericardium are an alternative to replace infected prosthetic graft. We recently reported an innovative technique using a stapled porcine pericardial bioconduit for immediate vascular reconstruction in emergency. The objective of this study is to compare the growth and adherence to grafts of bacteria and yeast incubated with stapled porcine pericardium, sutured or naked pericardium.
One square centimeter of porcine pericardial patches, with or without staples or sutures, was incubated with 10 <sup>5</sup> colony forming units of Escherichia coli, Staphylococcus aureus, Staphylococcus epidermidis, and Candida albicans for 1, 6, and 24 h. The medium was collected to quantify planktonic microorganisms, while grafts were sonicated to quantify adherent microorganisms. Dacron and Dacron Silver were analyzed in parallel as synthetic reference prostheses.
Stapled porcine pericardium reduced the growth and the adherence of E coli (2- to 30-fold; P < 0.0005), S aureus (11- to 1000-fold; P < 0.0006), S epidermidis (>500-fold; P < 0.0001), and C albicans (12- to 50-fold; P < 0.0001) when compared to medium alone (growth) and pericardium or Dacron (adherence). Native and sutured porcine pericardium interfered with the growth and the adherence of E coli and C albicans, and Dacron with that of S epidermidis. As expected, Dacron Silver was robustly bactericidal.
Stapled porcine pericardium exhibited a lower susceptibility to infection by bacteria and yeasts in vitro when compared to the native and sutured porcine pericardium. Stapled porcine pericardium might be a good option for rapid vascular grafting without increasing infectivity
Strong Electron-Phonon Coupling in Superconducting MgB: A Specific Heat Study
We report on measurements of the specific heat of the recently discovered
superconductor MgB in the temperature range between 3 and 220 K. Based on a
modified Debye-Einstein model, we have achieved a rather accurate account of
the lattice contribution to the specific heat, which allows us to separate the
electronic contribution from the total measured specific heat. From our result
for the electronic specific heat, we estimate the electron-phonon coupling
constant to be of the order of 2, significantly enhanced compared to
common weak-coupling values . Our data also indicate that the
electronic specific heat in the superconducting state of MgB can be
accounted for by a conventional, s-wave type BCS-model.Comment: 4 pages, 4 figure
Organische Dünger in Topfkulturen auf dem Prüfstand - wie steht es mit der Stickstofffreisetzung?
Matching nitrogen demand of plants and N release of organic fertilizers with respect to amount and timing is one key for successful cultivation of organic ornamentals. Thereby for plants with a low to moderate N demand growers can add the fertilizer as complete preplant application (CPA). For plants with a high N demand splitting fertilization in a reduced preplant application combined with an additional fertigation (RPA+F) is preferable. Aim of the current research was the investigation of N release of organic fertilizers in incubation experiments. Results of the incubation experiment were linked to a pot trial with pelargonium. Incubation experiments reveal that most
fertilizers release about 40 to 50 % of total N and most nitrogen is released within the first 21 days. Only for sheep wool a delay of N release up to ten days was found. CPA using sheep wool and RPA+F (irrespective of fertilizer) give the best results. The delayed release pattern of sheep wool seems to match best N demand of plants
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