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Cells communicate with each other through three different pathways: direct physical contact, chemical molecules and via electrical signals. This latter is characteristic to neurons. Direct intercellular contacts are responsible not only for submitting information among the cells, but also form an interface separating them. Tight junctions are the tightest intercellular connections characteristic primarily to epithelial cells. Adherens junctions and desmosomes also have the principal role of separating the cells, while gap junctions make possible the transfer of signalling molecules between two cells by interconnecting their cytoplasm. Communication via signalling molecules is a very effective type of intercellular information supply. In this respect cells can send signals to their own receptors (autocrine signalling), to cells coming in direct contact with them (juxtacrine signalling) and over short or large distances (paracrine and endocrine signalling, respectively). The most important endocrine signalling molecules are the hormones.
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Essay about the communication among animals and lower-level organisms.
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The author explains the differences between two types of knowledge, the paradigm corresponding to science and to the fine arts.
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Essay by contemporary Hungarian writer Adél Zsigmond.
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Review essay on a new monograph concerning the history of Hungarian literature.
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Essay on communication, universal language and the possibilities of universal knowledge.
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Essay on culture as organic unity by Hungarian literary historian Péter Cseke, editor of the journal "Korunk".
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Interview with the prominent Hungarian semiotician and philosopher of language János Petődi S.
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It seems that the first part of the 21st century will remain in history as a period which could be characterized as ruled by disintegrated balances and unexpected events. The paper presents those behavioural forms which can be considered as answers of those members and groups which constitute different kind of complex systems.
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Essay on democracy as adventure and the personality and legacy of prominent Hungarian politican Árpád Göncz.
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We are generally happy to accept that the orbit of a planet can be precisely predicted, or that we can have more and more accurate forecasts of the weather. But we seldom study human behaviour with a similar approach. Every day we take many decisions according to our wish and whim, which makes us think that there is no more unpredictable test subject than a human being. This paper tells us about a research project which studied the behavioural patterns of millions of anonymous mobile phone users, only to prove this concept wrong. Although our memories are dominated by diversions from our daily routine, measurements indicate that human movements can be predicted with 93% accuracy. The paper also tells us about the root of this predictability and what its practical implications are – from the estimations of the spread of viruses to understanding mobile phone viruses.
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