84 research outputs found
Phonon-induced quadrupolar ordering of the magnetic superconductor TmNiBC
We present synchrotron x-ray diffraction studies revealing that the lattice
of thulium borocarbide is distorted below T_Q = 13.5 K at zero field. T_Q
increases and the amplitude of the displacements is drastically enhanced, by a
factor of 10 at 60 kOe, when a magnetic field is applied along [100]. The
distortion occurs at the same wave vector as the antiferromagnetic ordering
induced by the a-axis field. A model is presented that accounts for the
properties of the quadrupolar phase and explains the peculiar behavior of the
antiferromagnetic ordering previously observed in this compound.Comment: submitted to PR
Direct observation of Thermomyces lanuginosus lipase diffusional states by Single Particle Tracking and their remodeling by mutations and inhibition
Quantification of growth factors in allogenic bone grafts extracted with three different methods
Effect of low level laser therapy on the repair of bone defects grafted with inorganic bovine bone
Functional assessment of older patients in the emergency department: comparison between standard instruments, medical records and physicians' perceptions
BACKGROUND: We evaluated the accuracy of physician recognition of functional status impairment in older emergency departments (ED) patients. In particular, we evaluated the accuracy of medical records (a comparison of the information in the medical record with the functional status based on proxy interviews), and the accuracy of physician knowledge (a comparison of the information obtained from the responsible physician with the functional status based on proxy interviews). METHODS: Cross-sectional study on 101 frail older patients selected at random from among those attending ED, their ED physicians, and respondents. The study was conducted at ED in four general university teaching hospitals in a city, from July through November 2003. Functional data shown on patients' medical records were compared against functional data obtained from respondents (family members), using Kendall's Tau-b statistic. In addition patients' Katz Indices (which assesses six basic activities of daily living â basic ADL) based on interviews with ED physicians were compared against those obtained from respondents, using the coefficient of concordance weighted kappa (Îș). Each patient and his respondent were paired with a single physician. RESULTS: The correlation between information on dependence for basic ADL obtained from medical records and that furnished by respondents, was 0.41 (95% CI 0.27â0.55). Concordance between the respective Katz Indices obtained from physicians and respondents was 0.47 (95% CI 0.38â0.57). CONCLUSION: Older subjects' functional status is not properly assessed by emergency department physicians
In situ measurement of bovine serum albumin interaction with gold nanospheres
Here we present in situ observations of adsorption of bovine serum albumin (BSA) on citratestabilized
gold nanospheres. We implemented scattering correlation spectroscopy as a tool to
quantify changes in the nanoparticle Brownian motion resulting from BSA adsorption onto the
nanoparticle surface. Protein binding was observed as an increase in the nanoparticle
hydrodynamic radius. Our results indicate the formation of a protein monolayer at similar albumin
concentrations as those found in human blood. Additionally, by monitoring the frequency and
intensity of individual scattering events caused by single gold nanoparticles passing the
observation volume, we found that BSA did not induce colloidal aggregation, a relevant result
from the toxicological viewpoint. Moreover, to elucidate the thermodynamics of the gold
nanoparticle-BSA association, we measured an adsorption isotherm which was best described by
an anti-cooperative binding model. The number of binding sites based on this model was
consistent with a BSA monolayer in its native state. In contrast, experiments using poly-ethylene
glycol capped gold nanoparticles revealed no evidence for adsorption of BSA
Alveolar ridge augmentation in rats by combined hydroxylapatite and osteoinductive material
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