Conceptual framework for strengthening exercises to prevent hamstring strains

High-speed running accounts for the majority of hamstring strains in many sports. The terminal swing phase is believed to be the most hazardous as the hamstrings are undergoing an active lengthening contraction in a long muscle length position. Prevention-based strength training mainly focuses on eccentric exercises. However, it appears crucial to integrate other parameters than the contraction type. Therefore, the aim of this study is to present a conceptual framework based on six key parameters (contraction type, load, range of motion, angular velocity, uni-/bilateral exercises, kinetic chain) for the hamstring's strength exercise for strain prevention. Based on the biomechanical parameters of sprinting, it is proposed to use high-load eccentric contractions. The movement should be performed at a slow to moderate angular velocity and focused at the knee joint, while the hip is kept in a large flexion position in order to reach a greater elongation stress of the hamstrings than in the terminal swing phase. In this way, we believe that, during sprinting, athletes would be better trained to brake the knee extension effectively in the whole range of motion without overstretch of the hamstrings. Finally, based on its functional application, unilateral open kinetic chain should be preferred.

Catalogue des peintures, aquarelles, dessins et lithographies de A. Raffet, des tableaux anciens et modernes... et des objets d'art formant la succession de feu M. Aug. Raffet fils... vente le 16 mars 1911, hôtel Drouot... / [experts] Mannheim, Delteil, Féral ; [notice de] François Courboin

[Vente. Estampes. 1911-03-16. Paris]

State-of-the-art of 3D cultures (organs-on-a-chip) in safety testing and pathophysiology.

Integrated approaches using different in vitro methods in combination with bioinformatics can (i) increase the success rate and speed of drug development; (ii) improve the accuracy of toxicological risk assessment; and (iii) increase our understanding of disease. Three-dimensional (3D) cell culture models are important building blocks of this strategy which has emerged during the last years. The majority of these models are organotypic, i.e., they aim to reproduce major functions of an organ or organ system. This implies in many cases that more than one cell type forms the 3D structure, and often matrix elements play an important role. This review summarizes the state of the art concerning commonalities of the different models. For instance, the theory of mass transport/metabolite exchange in 3D systems and the special analytical requirements for test endpoints in organotypic cultures are discussed in detail. In the next part, 3D model systems for selected organs--liver, lung, skin, brain--are presented and characterized in dedicated chapters. Also, 3D approaches to the modeling of tumors are presented and discussed. All chapters give a historical background, illustrate the large variety of approaches, and highlight up- and downsides as well as specific requirements. Moreover, they refer to the application in disease modeling, drug discovery and safety assessment. Finally, consensus recommendations indicate a roadmap for the successful implementation of 3D models in routine screening. It is expected that the use of such models will accelerate progress by reducing error rates and wrong predictions from compound testing.

[Illustrations de L'Art de raffiner le sucre] / Ludovic Simonneau, grav. ; Henri-Louis Duhamel du Monceau, aut. du texte

Comprend : [pl.I en reg. p.78 : moulin à sucre de canne employé en Amérique.] [Cote : V 3992/Microfilm R 122 218] ; [pl.II en reg. p.78 : cellier où l'on stocke les barils de sucre brut. Raffinage du sucre.] [Cote : V 3992/Microfilm R 122 218] ; [pl.III en reg. p.78 : la halle aux chaudières. Raffinage du sucre. Planche gravée d'après un dessin de M. Desfriches.] [Cote : V 3992/Microfilm R 122 218] ; [pl.IV en reg. p.78 : la halle aux chaudières. Raffinage du sucre.] [Cote : V 3992/Microfilm R 122 218] ; [pl.V en reg. p.78 : comment sont montée les chaudières pour le raffinage du sucre.] [Cote : V 3992/Microfilm R 122 218] ; [pl.VI en reg. p.78 : diverses formes pour monter les pains de sucre. Raffinage du sucre.] [Cote : V 3992/Microfilm R 122 218] ; [pl.VII en reg. p.78 : comment travailler au traitement et au raffinage du sucre.] [Cote : V 3992/Microfilm R 122 218] ; [pl.VIII en reg. p.78 : un grenier dit aux pièces. Raffinage et stockage du sucre.] [Cote : V 3992/Microfilm R 122 218] ; [pl.IX en reg. p.78 : préparation des pins de sucre avant de le mettre à l'étuve. Manière de les mettre en papier et en corde. La mise en tonne. Le travail des écumes.] [Cote : V 3992/Microfilm R 122 218] ; [pl.X en reg. p.78 : détail d'une étuve à sucre.] [Cote : V 3992/Microfilm R 122 218]

La caverna de Josep Palau i Fabre (1952-1969): teatre versus al·legoria filosòfica per a representar i impedir el final tràgic i fosc del lluminós art de pensar.

What is the use of performing the myth of the cave from book VII of the Republic by Plato? Josep Palau i Fabre, considers that, in Plato's dialogues, the speakers are mere instruments at the service of his dialectical goal. The aim of this article is to show how, by turning the myth into a tragedy and also by relying on Heraclitus's conflict or war of opposites, the playwright succeeds in favoring a sort of thought which is not one-sided or univocal. On the contrary, in Palau i Fabre's La Caverna, the tragic hero, that is, the released prisoner transformed by the light of Reality and finally killed by his "cavemates" -after having been imprisoned again and having tried to rescue them from their ignorance or shadows-, still leaves to them his powerful experience of the agonistikos thought, which might bear fruit in their life to come.

Regulated exocytosis from astrocytes physiological and pathological related aspects.

Astrocytes have traditionally been considered ancillary, satellite cells of the nervous system. However, it is a very recent acquisition that glial cells generate signaling loops which are integral to the brain circuitry and participate, interactively with neuronal networks, in the processing of information. Such a conceptual breakthrough makes this field of investigation one of the hottest in neuroscience, as it calls for a revision of past theories of brain function as well as for new strategies of experimental exploration of brain function. Glial cells are electrically not excitable, and it was only the use of optical recording techniques together with calcium sensitive dyes, that allowed the chemical excitability of glial cells to become apparent. Studies using these new techniques have shown for the first time that glial cells are activated by surrounding synaptic activity and translate neuronal signals into their own calcium code. Intracellular calcium concentration([Ca2+]i) elevations in glial cells have then shown to underlie spatial transfer of information in the glial network, accompanied by release of chemical transmitters (gliotransmitters) such as glutamate and back-signaling to neurons. As a consequence, optical imaging techniques applied to cell cultures or intact tissue have become a state-of-the-art technology for studying glial cell signaling. The molecular mechanisms leading to release of "gliotransmitters," especially glutamate, from glia are under debate. Accumulating evidence clearly indicates that astrocytes secrete numerous transmitters by Ca(2+)-dependent exocytosis. This review will discuss the mechanisms underlying the release of chemical transmitters from astrocytes with a particular emphasis to the regulated exocytosis processes.

[Illustrations de Art de chevalerie] / [Non identifié] ; Johann Hacobi von Wallhausen, aut. du texte

Comprend : [Frontispice : éléments d'architecture, figures de deux soldats en armure, scène de charge de cavalerie.] [Cote : Res Z Fontanieu 103 (5)] ; [Pl. dépl. en reg. p.68 (ou 446) : art équestre. Manière de monter à cheval.] [Cote : Res Z Fontanieu 103 (5)] ; [Pl. dépl. en reg. p.72 (ou 452) : art équestre. Manière de faire tourner le cheval en une ronde ou dans une figure serpentine.] [Cote : Res Z Fontanieu 103 (5)] ; [Pl. dépl. en reg. p.78 (ou 460) : art équestre. Manière de faire monter une côte à un cheval, de lui faire sauter un obstacle.] [Cote : Res Z Fontanieu 103 (5)] ; [Pl. dépl. en reg. p.80 (ou 464) : art équestre. Manière de faire traverser un fleuve à un cheval, de lui faire traverser un pont étroit et de lui faire dominer sa peur du feu. ] [Cote : Res Z Fontanieu 103 (5)] ; [Pl. dépl. en reg. p.84 (ou 470) : art équestre. Manière de combattre avec un lance sur un cheval.] [Cote : Res Z Fontanieu 103 (5)] ; [Pl. dépl. en reg. p.86 (ou 474) : art équestre. Manière de combattre avec un lance ou avec une épéesur un cheval.] [Cote : Res Z Fontanieu 103 (5)] ; [Pl. dépl. en reg. p.88 (ou 478) : art équestre. Manière de combattre avec des arquebuses sur un cheval.] [Cote : Res Z Fontanieu 103 (5)] ; [Pl. dépl. en reg. p.90 (ou 482) : art équestre. Manière de combattre avec des arquebuses ou des épées sur un cheval.] [Cote : Res Z Fontanieu 103 (5)] ; [Pl. dépl. en reg. p.94 (ou 488) : art équestre. Manière de combattre entre un fantassin et un cavalier.] [Cote : Res Z Fontanieu 103 (5)] ; [Pl. dépl. en reg. p.96 (ou 492) : art équestre. Manière de combattre entre un fantassin et un cavalier ou entre deux cavalier armés d'épées.] [Cote : Res Z Fontanieu 103 (5)] ; [Pl. dépl. en reg. p.100 (ou 498) : art équestre. Manière de combattre entre cavaliers.] [Cote : Res Z Fontanieu 103 (5)] ; [Pl. dépl. en reg. p.102 (ou 502) : art équestre. Manière de combattre entre deux adversaires à pied.] [Cote : Res Z Fontanieu 103 (5)] ; [Pl. dépl. en reg. p.106 (ou 508) : art équestre. Scène de batailel avec charge de cavalerie.] [Cote : Res Z Fontanieu 103 (5)] ; [Vigentte p.512 : marque d'imprimeur.] [Cote : Res Z Fontanieu 103 (5)]