Plásticos reforzados con fibras naturales en el sector automotriz

El siguiente artículo trata de plásticos reforzados con fibras naturales y sus aplicaciones, principalmente en la producción de autopartes. Estos materiales tienen algunas propiedades que pueden dar cumplimiento a nuevos reglamentos establecidos para proteger el ambiente. Este artículo muestra las propiedades de los plásticos, fibras naturales y artificiales, plásticos reforzados con ellos y partes fabricadas con estos materiales. Se menciona, además, a los líderes en el sector automotriz y las partes plásticas usadas en diferentes vehículos

Mechanical thrombectomy in acute stroke – Five years of experience in Poland

Objectives Mechanical thrombectomy (MT) is not reimbursed by the Polish public health system. We present a description of 5 years of experience with MT in acute stroke in Comprehensive Stroke Centers (CSCs) in Poland. Methods and results We retrospectively analyzed the results of a structured questionnaire from 23 out of 25 identified CSCs and 22 data sets that include 61 clinical, radiological and outcome measures. Results Most of the CSCs (74%) were founded at University Hospitals and most (65.2%) work round the clock. In 78.3% of them, the working teams are composed of neurologists and neuro-radiologists. All CSCs perform CT and angio-CT before MT. In total 586 patients were subjected to MT and data from 531 of them were analyzed. Mean time laps from stroke onset to groin puncture was 250±99min. 90.3% of the studied patients had MT within 6h from stroke onset; 59.3% of them were treated with IV rt-PA prior to MT; 15.1% had IA rt-PA during MT and 4.7% – emergent stenting of a large vessel. M1 of MCA was occluded in 47.8% of cases. The Solitaire device was used in 53% of cases. Successful recanalization (TICI2b–TICI3) was achieved in 64.6% of cases and 53.4% of patients did not experience hemorrhagic transformation. Clinical improvement on discharge was noticed in 53.7% of cases, futile recanalization – in 30.7%, mRS of 0–2 – in 31.4% and mRS of 6 in 22% of cases. Conclusion Our results can help harmonize standards for MT in Poland according to international guidelines

Electrical properties of Lupinus angustifolius L. stem L Subthreshold potentials

Subthreshold and action potentials in Lupinus stem in response to sub-threshold and threshold stimuli (square constant current pulses) were studied. The occurrence of electrotonic potentials and local responses is demonstrated. The general characteristic of these responses and their amplitudes are the same as demonstrated for the isolated crab axons by Hodgkin (1939) and Hodgkin and Rushton (1946). The course of the phenomenon, however, is about 108-104 times slower in plants

Sur une inscription de Phrygie relative au Cursus Publicus

Discussion de la topographie des villages en conflit sur les charges du cursus devant les procurateurs des domaines impériaux ; parcours des routes de la région. Caractère de l'inscription ; l'organisation régulière des transports ; le cursus clabularis ; les attelages fournis par les villages, et les voitures par l'État ; dépôts de fourrage. Le nom du village des Antimachenoi et l'origine de ce village, ancien domaine d'un propriétaire grec.Zawadzki Tadeusz. Sur une inscription de Phrygie relative au Cursus Publicus. In: Revue des Études Anciennes. Tome 62, 1960, n°1-2. pp. 80-94

Electrical properties of Lupinus angustifolius L. stem. III. RC model, time constant, latency and threshold charge

The changes of potential in the stem of Lupinus were characterized on the basis of the strength-duration relation and of electrotonic potentials. It was found that the stimulated stem behaves like an electrical RC circuit. The time constants of electrotonic potential rise and decay were determined. A simple electrical model characterizing the passive electrical properties of the Lupinus stem is suggested. The values of resistance and capacitance of the Lupinus stem were determined on the basis of the RC circuit. The resistance-capacitance properties of the stem tissues serve as basis to gain a better knowledge of the parametres describing excitation, such as the strength-duration relation or latency. These properties in the stem of Lupinus are of the same nature as those in nerves or muscles. The values of the threshold charge of the order of 10-6 C were calculated. It is suggested that the regularities occurring here may be connected with accommodation and processes regulating the resting potential of cells

Electrical properties of Lupinus angustifolius L. stem. III. RC model, time constant, latency and threshold charge

The changes of potential in the stem of Lupinus were characterized on the basis of the strength-duration relation and of electrotonic potentials. It was found that the stimulated stem behaves like an electrical RC circuit. The time constants of electrotonic potential rise and decay were determined. A simple electrical model characterizing the passive electrical properties of the Lupinus stem is suggested. The values of resistance and capacitance of the Lupinus stem were determined on the basis of the RC circuit. The resistance-capacitance properties of the stem tissues serve as basis to gain a better knowledge of the parametres describing excitation, such as the strength-duration relation or latency. These properties in the stem of Lupinus are of the same nature as those in nerves or muscles. The values of the threshold charge of the order of 10-6 C were calculated. It is suggested that the regularities occurring here may be connected with accommodation and processes regulating the resting potential of cells