The Effect of Temperature, Rest Periods and Ageing on the Response of Bituminous Materials in Fatigue Tests: Considerations and Proposals on Analytical Dimensioning Models.

One of the basic assumptions of analytical dimensioning models of asphalt pavements is failure due to fatigue cracking of the bituminous layers. Furthermore, it is considered that the damaging effects of different traffic loads are linear and cumulative, per Miner's law. However, the analysis carried out on the effect of temperature, rest periods, and ageing of the bituminous materials questions considering fatigue failure as the only and main assumption for the calculation of the pavement life. Ageing of the pavement asphalt layers results in stiffening and transverse cracking. Consequently, these asphalt layers are no longer of infinite extent in the horizontal direction and their response resembles that of a slab. The application of this last calculation assumption provides pavement sections more in line with those used in Spain in the Catalogue of Structural Sections, which is based on experience gained from the real behavior of those sections. The calculation based on the fatigue laws results in undersized structures. This paper shows the results of a strain sweep test implemented at the UPC Roads Laboratory, which was used to analyse all the aforementioned effects and to propose a calculation procedure for heavy traffic pavements considering transverse cracking of the asphalt layers.

Polineuropatía periférica sensitivo-motora paraneoplásica asociada a anti-Ri: a propósito de un caso / Paraneoplastic sensory-motor peripheral polyneuropathy associated with anti-Ri: A case report

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Levodopa infusion improves impulsivity and dopamine dysregulation syndrome in Parkinson's disease.

BACKGROUND: Impulsivity and dopamine dysregulation syndrome are frequent complications of treatment in Parkinson's disease (PD). METHODS: We assessed the effect of jejunal levodopa infusion (JLI) on behavioral symptoms in 8 PD patients with motor complications and severe impulsivity and dopamine dysregulation syndrome (DDS), which had not be controlled before by adjusting oral medications. The infusion was delivered during 15 hours (daily dose 1007.2 ± 302.5 mg) and stopped at night time. Patients were reassessed after 25 ± 9 weeks of treatment with a stable dose of jejunal l-dopa. RESULTS: Off periods and dyskinesias decreased by 27% and 20,7% respectively, compared to baseline. DDS and all types of impulse control disorders (ICDs) improved in all patients, with nearly complete symptom resolution. Punding improved in all 5 patients but disappeared completely in only 1. CONCLUSIONS: Our experience suggests that l-dopa infusion has a positive effect on both motor complications and behavioral disorders. This treatment approach deserves further controlled studies.

Neurobehçet: a propósito de un caso / NeuroBehçet: a case

La enfermedad de Behçet es un trastorno inflamatorio sistémico, caracterizado por aftosis orogenital así como por alteraciones oftalmológicas y cutáneas. Un 5% de los pacientes presenta manifestaciones neurológicas. Se presenta un caso de neurobehçet con participación neurológica inhabitual.Varón de 28 años con antecedente de aftas orales y genitales recurrentes e historia de foliculitis, que acudió por cuadro de 48 h de fiebre, cefalea, náuseas, paresia del sexto par craneal y del miembro superior derecho. El análisis del líquido cefalorraquídeo reveló pleocitosis linfocitaria con hiperproteinorraquia, se inició tratamiento antibiótico de amplio espectro. Se realizó resonancia magnética cerebral, que mostró lesiones hiperintensas de predominio troncoencefálico con realce tras infusión de gadolinio y trombosis del seno transverso izquierdo. El paciente mejoró progresivamente con tratamiento intravenoso con corticoides hasta quedar asintomático.La afectación neurológica en la enfermedad de Behçet es infrecuente y más aún la coexistencia de lesiones intraparenquimatosas y extraparenquimatosas. Habitualmente, presenta buena respuesta al tratamiento inmunosupresor (AU)

Behçet′s disease is an inflammatory systemic disorder, with oral and genital ulcers, as well as ophthalmologic and cutaneous disturbances. 5% of the patients have neurological alterations. We present a case of neuroBehçet with a rare neurological involvement.A 28 years-old male patient with recurrent oral and genital ulcer history and folliculitis presents 48h progressive fever, headache, nausea, right sixth cranial nerve palsy and right upper limb paresis. The CSF showed lymphocyte pleocytosis and high proteinorrachia, so antibiotic treatment was initiated. Cerebral MR found hyperintense enhancing lesions in the brainstem and left transverse sinus thrombosis. Patient improved with endovenous corticosteroids and was discharged asymptomatic.Neurological involvement in Behçet′s disease is rare and moreover the coexistence of parenchymatous and non-parenchymatous alterations in the same patient. It normally has a good response to immunosuppressant treatment (AU)

Ozone oxidative post-conditioning in acute renal failure.

OBJECTIVES: The ischaemia-reperfusion process is largely mediated by reactive oxygen species. Taking into account that a transient and controlled administration of ozone is able to upregulate cellular antioxidant enzymes, a morphological, biochemical and functional renal study was performed in rats undergoing warm renal ischaemia. METHODS: Rats were divided into four groups. All except the negative controls underwent 60 min' bilateral renal ischaemia followed by 10 days' reperfusion. The positive control group received no further treatment. The ozone group received an ozone/oxygen mixture (ozone dose 0.5 mg/kg) immediately after the ischaemia and daily for the 10 days' reperfusion; the oxygen group were given the same concentration of oxygen alone (13 mg/kg). Biochemical parameters fructosamine, phospholipase A2, catalase, superoxide dismutase and thiobarbituric acid reactive substances were measured, as well as renal plasma flow and glomerular filtration rate. KEY FINDINGS: Renal plasma flow and glomerular filtration rate decreased significantly in the positive controls and the oxygen group whereas values in the ozone group were similar to those in the negative control group. With respect to the biochemical parameters, ozone maintained a homeostasis redox, with significant increases in catalase and superoxide dismutase activities and similar values for phospholipase A2 and fructosamine compared with the negative control group. Fewer morphological alterations were seen in kidneys from the ozone group. No advantages were obtained in the positive control and oxygen groups. CONCLUSIONS: The protective effect of ozone may be explained by upregulation of the antioxidant defence system and beneficial effects on blood circulation and in oxygen metabolism. Ozone treatment may represent a therapeutic approach for minimising renal damage after transplantation.

A new venomous scorpion responsible for severe envenomation in Argentina: Tityus confluens.

In Argentina the scorpions of medical importance belong to the genus Tityus (T.), particularly the species T. trivittatus, the only scorpion whose sting is recognized to be associated with severe human envenoming and death. This genus is distributed from the north of the Patagonian region to the center and some provinces in the north of the country. During the period 2003-2006 four children died following scorpion stings, of which one was certainly and three were probably by T. confluens. In 2006, in the province of Tucumán, a girl died by scorpion envenoming and the scorpion responsible for the death, found in her shoe, was T. confluens. We thus studied the toxicity of venom gland homogenates from T. confluens from the provinces of Jujuy and Catamarca, and of crude venom from specimens from Catamarca and the province of La Rioja. The lethal potencies of the telson homogenates were 7.0 and 18.6microg/g for Jujuy and Catamarca, respectively, while the lethal potency of the crude venom was 0.7microg/g. Injected mice showed generalized congestion and hepatic lesions. Pancreatic damage was observed in some animals. Lungs showed congestion and foci of hemorrhage and mild edema. The heart showed injury in the muscular fibers. The venom showed high reactivity against anti-T. trivittatus antivenom and against two anti-T. serrulatus antivenoms. The anti-T. trivittatus antivenom neutralized the lethal activity of T. confluens venom. In addition, the venom reacted very slightly against an anti-Centruroides antivenom. Therefore, the stings of this scorpion must be considered of risk for humans to the same degree as the stings of T. trivittatus.

[NeuroBehçet: A case]. / Neurobehçet: a propósito de un caso.

Behçet's disease is an inflammatory systemic disorder, with oral and genital ulcers, as well as ophthalmologic and cutaneous disturbances. 5% of the patients have neurological alterations. We present a case of neuroBehçet with a rare neurological involvement. A 28 years-old male patient with recurrent oral and genital ulcer history and folliculitis presents 48h progressive fever, headache, nausea, right sixth cranial nerve palsy and right upper limb paresis. The CSF showed lymphocyte pleocytosis and high proteinorrachia, so antibiotic treatment was initiated. Cerebral MR found hyperintense enhancing lesions in the brainstem and left transverse sinus thrombosis. Patient improved with endovenous corticosteroids and was discharged asymptomatic. Neurological involvement in Behçet's disease is rare and moreover the coexistence of parenchymatous and non-parenchymatous alterations in the same patient. It normally has a good response to immunosuppressant treatment.

Ateromatosis del arco aórtico y riesgo de ictus isquémico: a propósito de un caso / Atheroma of the aortic arch and risk of ischemic stroke: a case

Las placas de ateroma del arco aórtico son un factor de riesgo poco conocido de ictus isquémico, generalmente por la producción de embolias arterioarteriales. Presentamos el caso de un varón de 67 años que llegó a nuestro hospital con un ictus hemisférico izquierdo con estudio etiológico rutinario negativo. En el ecocardiograma transesofágico (ETE), se detectó una gran placa de ateroma en arco aórtico, ulcerada y complicada, con trombo móvil en su pared, presuntamente causante del cuadro actual. La ateromatosis del arco aórtico es un factor de riesgo independiente de infarto cerebral, especialmente las placas grandes, ulceradas o trombosadas, y aparece en un porcentaje elevado de pacientes con ictus criptogénico. La actitud diagnóstica y terapéutica es controvertida en estos casos, pero se suele aconsejar el ETE, como método de referencia diagnóstico, y la antiagregación, como prevención secundaria. En el momento actual, son necesarios más estudios epidemiológicos, así como ensayos clínicos, para elaborar guías de tratamiento en estas situaciones (AU)

Aortic arch atheroma is a poorly understood risk factor for stroke, usually producing arterial embolisms. A 67 year-old male was admitted to our hospital with a left hemispheric stroke with a negative routine aetiological study. Transesophageal echocardiography (TEE) showed atherosclerosis of the aortic arch with mobile thrombus, presumably causing the actual stroke. Aortic arch atheromatosis is an independent risk factor for cerebral infarction, particularly large, ulcerated or thrombotic plaques, and it is found in many patients with cryptogenic stroke. Diagnosis and treatmnent is not clear in these cases, but TEE is used as gold-standard complementary test with antiplatelets as secondary prevention. Further epidemiological studies and clinical trials are necessary for the preparation of clinical guides (AU)

The role of Serratia marcescens porins in antibiotic resistance.

The outer membrane permeability of Serratia marcescens was studied by comparing porin-deficient mutants with their parental strains. Omp1-deficient strains were selected by moxalactam resistance, whereas mutants lacking the Omp2 porin were obtained by experimental infection with the SMP2 phage, whose primary receptor is the Omp2 porin. The role of porins was demonstrated in quinolone accumulation assays, where semiquantitative differences in accumulation were observed. Permeability coefficients to cephaloridine of Omp1 mutants were determined and compared with those of the parental strain. The clinical isolates S. marcescens HCPR1 and 866 showed 30- to 200-fold reduced permeability coefficients when Omp1 porin was absent.