637 research outputs found
Hydrodynamics in the wake of a pitching foil
The effect of flexibility on the hydrodynamic loads and on the flow
structures generated on a rectangular foil when oscillating in pitch has been
studied. Hydrodynamic loads were measured with a 6-axes balance, and the flow
structures were investigated by using a Digital Particle Image Velocimetry
(DPIV). It is known from nature's fin based propulsion mechanisms, that
appendage stiffness plays an important role in their propulsive efficiency. We
have studied four different stiffnesses, ranging from completely rigid to
highly flexible. Optimal efficiency has been observed for an intermediate case.
In this case, a moderately stronger trailing-edge vortex system takes place. A
very high level of flexibility of the foil results in a reduction of
efficiency.Comment: 4 pages, 4 figures, there are two videos include
Aportaciones al conocimiento de la flora muscinal del Pirineo Occidental
In this paper we give citations of 122 taxa of mosses, which have been collected in 31 sites in the Western Pyrenees, in Navarra (Northern Spain). 9 of them are new records to the moss flora of Navarra and 2 are new records both for Navarra and for all the Pyrenees. Some of the more noticeable novelties are Dicranum crassifolium SĂ©rgio, Ochyra & SĂ©neca, Orthotrichum acuminatum H. Phillib. and Orthotrichum shawii Wilson
5D quantum dynamics of the H2@SWNT system: Quantitative study of the rotational-translational coupling
The dynamics of the dihydrogen molecule when confined in carbon nanotubes with different chiral- ities and diameters are studied by using a 5 dimensional model considering the most relevant degrees of freedom of the system. The nuclear eigenstates are calculated for an (8,0) and a (5,0) carbon nanotubes by the State-Average Multiconfigurational Time-dependent Hartree, and then studied using qualitative tools (mapping of the total wave functions onto given subspaces) and more rigorous analysis (different kinds of overlaps with reference functions). The qualitative analysis is seen to fail due to a strong coupling between the internal and translational degrees of freedom. Using more accurate tools allows us to gain a deeper insight into the behaviour of confined species
Hearing Impairment and Quality of Life in Adults with Asymmetric Hearing Loss: Benefits of Bimodal Stimulation
Objectives: Bimodal stimulation for asymmetric hearing loss is an emerging treatment with proven audiometric outcomes. Our objectives are to assess the changes of the hearing impairment and the quality of life of patients treated with this type of stimulation, when compared to a unilateral Cochlear Implant (CI) stimulated condition.
Materials and methods: 31 patients with asymmetric hearing loss (Group 1) were recruited for the study. They were divided into three groups, based on their hearing loss in the ear treated with the hearing aid: Group 1A (Pure Tone Audiometry (PTA) between 41 and 70 decibels (dB)); Group 1B, (PTA between 71 and 80 dB) and Group 1C (PTA between 81 and 90 dB). 30 patients had profound, bilateral hearing loss. Then, users of a unilateral cochlear implant were recruited for the control group. Their hearing impairment and quality of life were analyzed with questionnaires Abbreviated Profile of Hearing Aid Benefit (APHAB), Speech, Spatial and Qualities of Hearing Scale (SSQ) and the Health Utilities Index (HUI). They were followed up for at least 2 years.
Results: The group with the asymmetric hearing loss obtains a statistically significant clinical improvement in the APHAB under category "with hearing aid" compared to "without hearing aid". The group with the asymmetric hearing loss benefits more across basically all variables compared with the control group in the SSQ. Group 1A obtains the best outcome of the sample in the HUI.
Conclusion: Bimodal stimulation and better hearing in the ear treated with the hearing aid reduce hearing impairment and improve the quality of life
Temblor ortostático como causa de inestabilidad
Orthostatic tremor (OT) is a neurological disease of unknown aetiology. It is defined
by the presence of a 10-20 Hz tremor in the legs while standing still. Symptoms described are
dizziness and instability that diminish if the patient sits down or leans on something; drinking
small amounts of alcohol significantly reduces OT. Due to the dizziness and/or unsteadiness,
these patients are usually referred to the neuro-otology department. We report 4 cases diagnosed
with OT. The diagnosis of OT should be considered for patients with instability. The
clinical history is a key factor to suspect this entity, and the diagnosis is given by the register of
10-20 Hz contractions on limb electromyography. Treatment for this disease consists of medical
treatment; the first option is clonazepam.
© 2011 Elsevier España, S.L. All rights reserved
Long-Term Safety of Tedizolid in a Patient With Spondilodiscitis After Switch From Linezolid Due to Toxicity
The patient is a 57-year-old man with liver cirrhosis, Bricker anastomosis after a radical cystoprostatectomy and, a history of bacteremias caused by extended-spectrum -lactamase-positive Escherichia coli, Enterococcus faecium, and Candida albicans. He presented with persistent low back pain and was diagnosed with vertebral osteomyelitis, for which he received ertapenem-linezolid treatment. However, after 20 days, linezolid had to be discontinued because of myelotoxicity and metabolic acidosis. The patient was switched to tedizolid, which, in combination with ertapenem, was successfully given for 114 days until biopsy showed no growth of gram-positive cocci. We conclude that tedizolid can be an alternative to linezolid in case of toxicity, especially in long-term treatments
ReconstrucciĂłn de defectos farĂngeos
Reconstruction of pharyngeal defects continues to present a clinical challenge for the head and
neck surgeon. We have different reconstructive options to preserve speech, airway, and
swallowing functions. Reconstructive surgery implies a balance between oncologic cure, patient
morbidity, and quality of life.
Classical reconstructive techniques include pedicled cervical cutaneous or myocutaneous flaps
and distal myocutaneous flaps such as from the pectoralis major. Current microvascular techniqu
Histopathological reaction in the vestibule after cochlear implantation in Macaca fascicularis.
Cochlear implantation surgery (CI) is considered a safe procedure and is the standard treatment for the auditory
rehabilitation in patients with severe-to-profound sensorineural hearing loss. Although the development of
minimally traumatic surgical concepts (MTSC) have enabled the preservation of residual hearing after the implantation, there is scarce literature regarding the vestibular affection following MTCS.
The aim of the study is to analyze histopathologic changes in the vestibule after CI in an animal model (Macaca
fascicularis). Cochlear implantation was performed successfully in 14 ears following MTCS. They were classified
in two groups upon type of electrode array used. Group A (n = 6) with a FLEX 28 electrode array and Group B (n
= 8) with HL14 array. A 6-month follow-up was carried out with periodic objective auditory testing. After their
sacrifice, histological processing and subsequent analysis was carried out. Intracochlear findings, vestibular
presence of fibrosis, obliteration or collapse is analyzed. Saccule and utricle dimensions and neuroepithelium
width is measured.
Cochlear implantation was performed successfully in all 14 ears through a round window approach. Mean
angle of insertion was >270◦ for group A and 180–270◦ for group B. In group A auditory deterioration was
observed in Mf 1A, Mf2A and Mf5A with histopathological signs of scala tympani ossification, saccule collapse
(Mf1A and Mf2A) and cochlear aqueduct obliteration (Mf5A). Besides, signs of endolymphatic sinus dilatation
was seen for Mf2B and Mf5A. Regarding group B, no auditory deterioration was observed. Histopathological
signs of endolymphatic sinus dilatation were seen in Mf 2B and Mf 8B.
In conclusion, the risk of histological damage of the vestibular organs following minimally traumatic surgical
concepts and the soft surgery principles is very low. CI surgery is a safe procedure and it can be done preserving
the vestibular structures
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