The Lord of Uraniborg

Thoren, Victor E.; Christianson, John Robert

doi:10.1017/cbo9780511665417

Cited by 23 publications

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“…The multiphoton cryo microscope can be easily upgraded to incorporate in addition UV light for one-photon excitation. Although not described here, the same system could also be used to study the adaption of plants to slow temperature changes in a range occurring naturally in nature by fluorescence imaging thus opening the possibility of studying the adaption of plants to weather and climate changes or their cold tolerance in general [5,7].…”

Section: Resultsmentioning

confidence: 99%

“…Understanding temperature-induced effects in plants is important for cryobiology and cryopreservation [1], furthermore, to investigate the response to external cooling and heating [2][3][4][5] and/or the associated microscopic effects on molecules such as chlorophyll [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…The size of the main chamber is 149 Â 94 mm 2 . (b) The cooling/heating stage can also be combined with a multiphoton tomograph(7).…”

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Multiphoton imaging of freezing and heating effects in plant leaves

Breunig

Tümer

König

2012

Journal of Biophotonics

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Thermally-induced changes in Arabidopsis thaliana leaves were investigated with a novel cryo microscope by multiphoton, fluorescence lifetime and spectral imaging as well as micro spectroscopy. Samples were excited with fs pulses in the near-infrared range and cooled/heated in a cryogenic chamber. The results show morphological changes in the chloroplast distribution as well as a shift from chlorophyll to cell-wall fluorescence with decreasing temperature. At temperatures below -40 °C, also second harmonic generation was observed. The measurements illustrate the suitability of multiphoton imaging to investigate thermally-induced changes at temperatures used for cryopreservation as well as for basic investigations of thermal effects on plant tissue in general.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multiphoton imaging of freezing and heating effects in plant leaves

Breunig

Tümer

König

2012

Journal of Biophotonics

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“…Tycho himself had used just such a stratagem in his De nova stella of 1573. 29 Moreover, the mention of the astronomical work Tycho then had in hand may seem like too pointed a reference to the printing of the De mundi aetherei recentioribus phaenomenis, the timing of which was a crucial point in Tycho's construction of his case against Ursus." But whether or not this particular letter is viewed with scepticism, there is ample evidence that Tycho had been circulating his correspondence with the Kassel astronomers from an even earlier date, and had sometimes explicitly authorized the production of further copies of these letters.…”

Section: Tycho Brahe and The Epistolae Astronomicaementioning

confidence: 99%

Epistolary Culture, Editorial Practices, and the Propriety of Tycho'sAstronomical Letters

Mosley

Jardine

Tybjerg

2003

Journal for the History of Astronomy

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IntroductionTycho Brahe's Epistolae astronomicae of 1596 has often been treated as a contribution to the Danish astronomer's dispute with Nicolai Reymers Baer, called Ursus. One purpose of this paper is to reconsider the question of whether this dispute was a major consideration in Tycho's decision to publish the work. The matter hinges, we feel, on issues of editorial practice: the standard interpretation of the work depends upon a charge of editorial impropriety levelled at Tycho, as the publisher of his own correspondence, by the twentieth-century editors of his Opera omnia, and accepted by later historians. It also turns on commonly held notions of the role and character of epistolary communication that are not wholly appropriate to the explication of scholarly letters written in the early-modem period. Consideration of early-modem epistolary culture allows us to establish a clearer picture of the possible range of functions of the Epistolae astronomicae, and this in tum enables a reappraisal ofthe charges levelled at Tycho. The standards required of letter-editors in the sixteenth century were not the same as those sought of early twentieth-century scholars, and it is, we suggest, the disjunction between these two, rather than a serious failure of either Tycho or his modem editors to live up the expectations of their contemporaries, that accounts for the current understanding of the Epistolae astronomicae. For reasons that are explicable, but regrettable, Tycho's behaviour as an editor of his own correspondence has long been, we believe, misrepresented.One moral to be drawn from this is that it is important for historians of science, even those who are not themselves engaged in the editing of historical documents, to be sensitive to the vagaries of editorial procedure and practice. There are many different interests at work amongst editors -whereas some focus mainly on producing readable texts, others prioritize the role of those texts as historical documents. In the case of the Epistolae astronomicae, scholars are typically working with a modem edition (prepared by John Dreyer and Hans Raeder) of an early-modem edition (compiled by Tycho Brahe and his assistants) of early-modem manuscripts (authored by Tycho and others). Our investigations suggest that, for the most part, they may rely upon the probity of all the editors involved in producing this composite document, and hence on the value of the modem edition of Epistolae astronomicae as a record of an actual letter-exchange. In general, however, historians would be unwise to take too much on trust. The purposes for which editions are produced, and the editorial principles behind them, may differ greatly from those we tend to take for granted.' A broader purpose of this paper, therefore, is to alert historians of

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“…Tycho Brahe was an admirer of Copernicus, and especially of the geometry of his planetary theory, but not the idea that the Earth was moving (Thoren, 1990). Tycho Brahe was a magnificent observer, but there are no attempts by Tycho Brahe to detect stellar parallax are known.…”

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confidence: 99%

The interplay of astronomy and philosophy

Флин

2003

Astronomical & Astrophysical Transactions

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The paper indicates the main common fields of interest in astronomy and philosophy.It is well known that astronomical bodies span an enormous scale of densities. In the famous de Vaucouleurs (1970) universal density-radius relation, the density scale extends over 45 orders of magnitude, from the density of neutron stars, that is the density of nuclear matter, through the density of supercluster regions, which is, on average, well beyond the best vacuum acquired in laboratories on the Earth. In this way, astronomical considerations allow one to study matter in extreme conditions. In the diagram in question the density of the human body can be marked, too. The existence of a human being is essential here. He or she is not only an observer of the surrounding Universe and the author of models and theories describing the Universe, but also the subject of reflections on the world.In the present paper, I outline only some of the basic areas of the common investigations of astronomers and philosophers. A deeper analysis of the relations requires an extensive multivolume critical analysis. I think, however, that a presentation of the relevant relations can be interesting, especially in the epoch of narrow specialization. This allows one to notice that the same objects and processes can be described and discussed from various points of view.As early as the birth of natural philosophy, when philosophers from the Ionian school presented a general explanation of the Universe for the first time, the question as to the principle of all things was asked as well (Tatarkiewicz, 2001). This was the question addressing the issue of the main substance constituting the Universe, as well as the principles of its construction. This was a query on the nature of the sort of primordial elements, leading to the development of the whole of nature. Empedocles of Acragas postulated the existence of four elements (or roots), namely, fire, air, water and earth, while Leucippos and Democritos of Abdera were the founders of the atomic theory, assuming the existence of an infinity of indestructible atoms, differing only geometrically from one another. The philosophical idea of *

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The Lord of Uraniborg

Cited by 23 publications

References 0 publications

Multiphoton imaging of freezing and heating effects in plant leaves

Multiphoton imaging of freezing and heating effects in plant leaves

Epistolary Culture, Editorial Practices, and the Propriety of Tycho'sAstronomical Letters

The interplay of astronomy and philosophy

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