While the control of cell migration by biochemical and biophysical factors is largely documented, a precise quantification of cell migration parameters in different experimental contexts is still questionable. Indeed, these phenomenological parameters can be evaluated from data obtained either at the cell population level or at the individual cell level. However, the range within which both characterizations of cell migration are equivalent remains unclear. We analyse here to which extent both sources of data could be integrated within a unified description (...) of cell migration by considering the motility of the endothelial cell line EAhy926. Using time-lapse video-microscopy and associated analysis of digital image time series, we quantified EAhy926 random motility coefficient, migration speed and trajectory persistence time in two different migration assays: the in vitro wound healing assay, and the cell-populated agarose drop assay. In order to analyse the agreement between independent quantifications of cell motility based either on individual cell analysis or cell population dynamic analysis, a theoretical multi-agents cellular model was developed and discussed as a possible theoretical framework able to unify these multi-scale data. Model simulations especially reveal the potential bias induced by cell proliferation and cell-cell adhesion when cell migration parameters are estimated from the extensively used in vitro wound healing assay. (shrink)
I am told that you raised your hand against yourselfAnticipating the butcher.[…]So the future lies in darkness and the forces of rightAre weak. All this was plain to youWhen you destroyed a torturable body.-- Bertold Brecht“On the Suicide of the Refugee W.B.”Like many influential contemporary thinkers, Arjun Appadurai and Giorgio Agamben suggest that globalization invites us to rethink our relationship with the nation or “postnation” (Appadurai; Agamben). One emblematic figure crystallizes the urgency of such a challenge: the refugee (Nyers; Shemak; (...) Bohmer; Chetail). In European urban centers--regardless of whether we speak as refugees, to refugees, or about refugees--complex transnational dialogues emerge. They .. (shrink)
Sólo es posible recrear la cosmovisión cristiana si la razón secular moderna reconoce su indigencia. Mientras se considere autosuficiente y entienda irrelevante el papel de las cosmovisiones religiosas en la vida humana, la transmisión será imposible.
Coherence is today a source of moral authority. Being coherent frees us from external influences and gives us the capacity to decide for ourselves, but also places us in a privileged position with regard to others. We will turn our attention now to coherence as a foundation of authority in organisations. And to do that, organisations must be divided into different levels and different dimensions. Coherence will only be possible when the worker is capable of weighing up the distance between (...) the organisation's specific vision and the operational processes that effectively take place within it. All companies, as a sum of possibilities, respond to the intention of those who govern them insofar as their assets permit it, and their ultimate value resides therein; the possibility of being recognised for their way of being, their corporate ethos. (shrink)
One field in ethics that has been developed during recent decades is virtue ethics, represented most importantly by Alasdair MacIntyre's work After Virtue. Virtue ethics is not opposed to principle-based ethics, but rather complements its task and develops it more fully. In the field of US bioethics, this option has proved to be even more fruitful, especially in the work of Edmund Pellegrino and David Thomasma. Virtue ethics is also being reappraised in relation to the ethics of organisations and business. (...) It is considered that the best way of running a company does not depend solely on a group of ethical principles or agreed criteria, but on the effective exercise of certain qualities of character. Indeed, minimal ethics do not guarantee the excellence of organisations, or even their correct development. They guarantee certain standards of coexistence, but this is not sufficient to carry forward a collective enterprise in a creative way. It is impossible to achieve the aims of an organisation without ambition, magnanimity, humility, prudence, responsibility and courage. This group of intangible elements are virtues. This article explores the process of decision-making in the light of Aristotelian ethics, in particular his work Nicomachean Ethics. Making decisions is a common task on the managerial agenda. The decisions of a manager affect individuals, the future of the organisation and, of course, they have consequences for the organisation and its surroundings. Aristotle dedicates Book III of the work in question to studying the art of deliberation and examining which virtues must be taken into account when reaching the best decision. Aristotle tells us that we deliberate about things that are within our power and can be done. There can be no deliberation upon exact and sufficient knowledge; however, we deliberate upon the things that are brought about by our own efforts, although not always in the same way. Leading an organisation is not a mechanical matter, but rather a process that requires creativity and responsibility. There are many different ways of doing it. Following the Aristotelian doctrine, this article aims to examine the elements that must be taken into consideration for correct decisions to be made. The following virtues play a fundamental role in this process: prudence, fortitude, justice and temperance, referred to below as called cardinal virtues. (shrink)
The nature of the contributions to astronomy of Caroline Lucretia Herschel are explored in this article. Her accomplishments included new observational discoveries and the skilled and accurate transcription and reduction of astronomical data. Although she made important additions to the sum total of astronomical facts available to the scientist, she herself showed little interest or ability in applying these data to explain phenomena. Love of her brother, Sir William Herschel, motivated her achievements in astronomy. Barred from the ranks of (...) creative astronomers by both her inability and her disinterest in abstract concepts, she substituted other qualities such as accuracy and perseverance which assured her a place in the history of astronomy. (shrink)
Caroline of Ansbach, wife of George II, occupied a crucial position in the public life of early 18th-century Britain. She was seen to exert considerable influence on the politics of the court and, as mother to the Hanoverian dynasty's next generation, she became an important emblem for the nation's political well-being. This paper examines how such emblematic significance was challenged and qualified when Caroline's body could no longer be portrayed as healthy and life giving. Using private memoirs and (...) correspondence from the time of her death in 1737, the paper explores the metaphorical potential of the queen's strangulated hernia, as well as the particular problems it posed for the public image of her dynasty. Through these investigations, the paper will comment upon the haphazard nature of public discussion in the early 18th century, and reveal the complex relationship between political speculation and medical diagnosis. (shrink)