Carl Wilhelm Scheele, the discoverer of oxygen, and a very productive chemist

2014 ◽  
Vol 307 (11) ◽  
pp. L811-L816 ◽  
Author(s):  
John B. West

Carl Wilhelm Scheele (1742–1786) has an important place in the history of the discovery of respiratory gases because he was undoubtedly the first person to prepare oxygen and describe some of its properties. Despite this, his contributions have often been overshadowed by those of Joseph Priestley and Antoine Lavoisier, who also played critical roles in preparing the gas and understanding its nature. Sadly, Scheele was slow to publish his discovery and therefore Priestley is rightly recognized as the first person to report the preparation of oxygen. This being said, the thinking of both Scheele and Priestley was dominated by the phlogiston theory, and it was left to Lavoisier to elucidate the true nature of oxygen. In addition to his work on oxygen, Scheele was enormously productive in other areas of chemistry. Arguably he discovered seven new elements and many other compounds. However, he kept a low profile during his life as a pharmacist, and he did not have strong links with contemporary prestigious institutions such as the Royal Society in England or the French Académie des Sciences. He was elected to the Royal Swedish Academy of Science but only attended one meeting. Partly as a result, he remains a somewhat nebulous figure despite the critical contribution he made to the history of respiratory gases and his extensive researches in other areas of chemistry. His death at the age of 43 may have been hastened by his habit of tasting the chemicals that he worked on.

2014 ◽  
Vol 306 (2) ◽  
pp. L111-L119 ◽  
Author(s):  
John B. West

Joseph Priestley (1733–1804) was the first person to report the discovery of oxygen and describe some of its extraordinary properties. As such he merits a special place in the history of respiratory physiology. In addition his descriptions in elegant 18th-century English were particularly arresting, and rereading them never fails to give a special pleasure. The gas was actually first prepared by Scheele (1742–1786) but his report was delayed. Lavoisier (1743–1794) repeated Priestley's initial experiment and went on to describe the true nature of oxygen that had eluded Priestley, who never abandoned the erroneous phlogiston theory. In addition to oxygen, Priestley isolated and characterized seven other gases. However, most of his writings were in theology because he was a conscientious clergyman all his life. Priestley was a product of the Enlightenment and argued that all beliefs should be able to stand the scientific scrutiny of experimental investigations. As a result his extreme liberal views were severely criticized by the established Church of England. In addition he was a supporter of both the French and American Revolutions. Ultimately his political and religious attitudes provoked a riot during which his home and his scientific equipment were destroyed. He therefore emigrated to America in 1794 where his friends included Thomas Jefferson and Benjamin Franklin. He settled in Northumberland, Pennsylvania although his scientific work never recovered from his forced departure. But the descriptions of his experiments with oxygen will always remain a high point in the history of respiratory physiology.


Science, medicine and dissent: Joseph Priestley (1733-1804) (papers celebrating the 250th anniversary of the birth of Joseph Priestley together with a catalogue of an exhibition held at the Royal Society and the Wellcome Institute for the History of Medicine) , edited by R. G. W. Anderson & C. Lawrence (pp. ix + 105). Published by Wellcome Trust and Science Museum, London, 1987, £9.95. The contents of this book are described accurately by a title of 18th- century amplitude. Priestley is remembered by chemists as the man who did most to establish the technique of pneumatic chemistry, for his discovery of ‘dephlogisticated air’ or oxygen, and for his refusal to abandon the phlogiston theory when confronted with Lavoisier’s revolution. He is occasionally remembered by physicists for his interest in electricity and optics. He was, however, a man of many other parts and the essays in this book deal, almost entirely, with these other aspects of his thought. Perhaps their scope is best illustrated by brief quotations from each of them since these are sometimes more revealing, in both substance and style, than the titles. They are as follows: C. Lawrence, ‘In this paper I shall outline Priestley’s biography and point to some areas in it where medicine was of importance.’ J. H. Brooke, ‘The paper had its origin in the realisation that I had been studying Whewell and Priestley, with different objects in view, and largely disregarding the stereotypes to which they have often been assimilated. It occurred to me that, despite the obvious problem of chronology, a comparison between their respective apologias for science might be instructive,...’.


2001 ◽  
pp. 29-36
Author(s):  
N. Nedzelska

The paradox of the existence of the species Homo sapiens is that we do not even know: Who are we? Why are we? Where did you go from? Why? At all times - from antiquity to our time - the philosophers touched on this topic. It takes an important place in all religions of the world. These eternal questions include gender issues. In the religious systems of the religions of the Abrahamic tradition there is no single answer to the question of which sex was the first person. Recently, British scientists have even tried to prove that Eve is 84 thousand years older Adam


2019 ◽  
Vol 75 (2) ◽  
pp. 137-154
Author(s):  
Sanjeev Kumar

In recent years, there has been a rise in China’s profile in South Asia. It is no surprise that Chinese experts have used terms, such as ‘new springtime’ in China–South Asia relations, ‘rediscovery of the strategic status of South Asia’ and ‘most relevant region with regard to the rise of China’.    The objective of this article is to examine the nature and drivers of China’s South Asia policy, especially under the leadership of Xi Jinping vis-à-vis China’s policy towards the region in the past. It is not sufficient to only examine international factors or foreign and security policy in the context of the neighbouring region, such as South Asia. China’s ‘domestic periphery’ presents a significant threat to its national security. These areas are linked to neighbouring countries of South Asia and Central Asia. The announcement by Chinese President Xi Jinping of a ‘New Era’ or ‘third era’ in the history of Communist Party of China (CPC) represents a China which is known for its dictum ‘striving for achievement’ ( fenfa youwei). This is different from the second era’s policy of ‘keeping a low profile and biding the time’ proposed by Deng Xiaoping. Of course, the name of Mao Zedong is synonymous with the first era beginning from 1949.


2020 ◽  
Vol 14 (2) ◽  
pp. 241-259
Author(s):  
Dirk Werle ◽  
Uwe Maximilian Korn

AbstractResearch on the history of fiction of the early modern period has up to now taken primarily the novel into consideration and paralleled the rise of the novel as the leading genre of narrative literature with the development of the modern consciousness of fictionality. In the present essay, we argue that contemporary reflections on fictionality in epic poetry, specifically, the carmen heroicum, must be taken into account to better understand the history of fiction from the seventeenth century onwards. The carmen heroicum, in the seventeenth century, is the leading narrative genre of contemporary poetics and as such often commented on in contexts involving questions of fictionality and the relationship between literature and truth, both in poetic treatises and in the poems themselves. To reconstruct a historical understanding of fictionality, the genre of the epic poem must therefore be taken into account.The carmen heroicum was the central narrative genre in antiquity, in the sixteenth century in Italy and France, and still in the seventeenth century in Germany and England. Martin Opitz, in his ground-breaking poetic treatise, the Buch von der Deutschen Poeterey (1624), counts the carmen heroicum among the most important poetic genres; but for poetry written in German, he cites just one example of the genre, a text he wrote himself. The genre of the novel is not mentioned at all among the poetic genres in Opitz’ treatise. Many other German poetic treatises of the seventeenth century mention the importance of the carmen heroicum, but they, too, provide only few examples of the genre, even though there were many Latin and German-language epic poems in the long seventeenth century. For Opitz, a carmen heroicum has to be distinguished from a work of history insofar as its author is allowed to add fictional embellishments to the ›true core‹ of the poem. Nevertheless, the epic poet is, according to Opitz, still bound to the truthfulness of his narrative.Shortly before the publication of Opitz’ book, Diederich von dem Werder translated Torquato Tasso’s epic poem Gerusalemme liberata (1580); his translation uses alexandrine verse, which had recently become widely successful in Germany, especially for epic poems. Von dem Werder exactly reproduces Tasso’s rhyming scheme and stanza form. He also supplies the text with several peritexts. In a preface, he assures the reader that, despite the description of unusual martial events and supernatural beings, his text can be considered poetry. In a historiographical introduction, he then describes the course of the First Crusade; however, he does not elaborate about the plot of the verse epic. In a preceding epyllion – also written in alexandrine verse – von dem Werder then poetically demonstrates how the poetry of a Christian poet differs from ancient models. All these efforts can be seen as parts of the attempt to legitimate the translation of fictional narrative in German poetry and poetics. Opitz and von dem Werder independently describe problems of contemporary literature in the 1620s using the example of the carmen heroicum. Both authors translate novels into German, too; but there are no poetological considerations in the prefaces of the novels that can be compared to those in the carmina heroica.Poetics following the model established by Opitz develop genre systems in which the carmen heroicum is given an important place, too; for example, in Balthasar Kindermann’s Der Deutsche Poet (1664), Sigmund von Birken’s Teutsche Rede- bind- und Dicht-Kunst (1679), and Daniel Georg Morhof’s Unterricht von der Teutschen Sprache und Poesie (1682). Of particular interest for the history of fictionality is Albrecht Christian Rotth’s Vollständige Deutsche Poesie (1688). When elaborating on the carmen heroicum, Rotth gives the word ›fiction‹ a positive terminological value and he treats questions of fictionality extensively. Rotth combines two contradictory statements, namely that a carmen heroicum is a poem and therefore invented and that a carmen heroicum contains important truths and is therefore true. He further develops the idea of the ›truthful core‹ around which poetic inventions are laid. With an extended exegesis of Homer’s Odyssey, he then illustrates what it means precisely to separate the ›core‹ and the poetic embellishments in a poem. All these efforts can be seen as parts of the attempt to legitimize a poem that tells the truth in a fictional mode.The paper argues that a history of fictionality must be a history that carefully reconstructs the various and specifically changing constellations of problems concerning how the phenomenon of fictionality may be interpreted in certain historical contexts. Relevant problems to which reflections on fictionality in seventeenth-century poetics of the epic poem and in paratexts to epic poems react are, on the one hand, the question of how the genre traditionally occupying the highest rank in genre taxonomy, the epic, can be adequately transformed in the German language, and, on the other hand, the question of how a poetic text can contain truths even if it is invented.


Religions ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 192
Author(s):  
Brentyn J. Ramm

In this paper, I investigate the phenomenology of awakening in Chinese Zen Buddhism. In this tradition, to awaken is to ‘see your true nature’. In particular, the two aspects of awakening are: (1) seeing that the nature of one’s self or mind is empty or void and (2) an erasing of the usual (though merely apparent) boundary between subject and object. In the early Zen tradition, there are many references to awakening as chopping off your head, not having eyes, nose and tongue, and seeing your ‘Original Face’. These references bear a remarkable resemblance to an approach to awakening developed by Douglas Harding. I will guide the reader through a series of Harding’s first-person experiments which investigate the gap where you cannot see your own head. I will endeavour to show that these methods, although radically different from traditional meditation techniques, result in an experience with striking similarities to Zen accounts of awakening, in particular, as experiencing oneself as empty or void and yet totally united with the given world. The repeatability and apparent reliability of these first-person methods opens up a class of awakening experience to empirical investigation and has the potential to provide new insights into nondual traditions.


2021 ◽  
Vol 11 (4) ◽  
pp. 521
Author(s):  
Jonathan Erez ◽  
Marie-Eve Gagnon ◽  
Adrian M. Owen

Investigating human consciousness based on brain activity alone is a key challenge in cognitive neuroscience. One of its central facets, the ability to form autobiographical memories, has been investigated through several fMRI studies that have revealed a pattern of activity across a network of frontal, parietal, and medial temporal lobe regions when participants view personal photographs, as opposed to when they view photographs from someone else’s life. Here, our goal was to attempt to decode when participants were re-experiencing an entire event, captured on video from a first-person perspective, relative to a very similar event experienced by someone else. Participants were asked to sit passively in a wheelchair while a researcher pushed them around a local mall. A small wearable camera was mounted on each participant, in order to capture autobiographical videos of the visit from a first-person perspective. One week later, participants were scanned while they passively viewed different categories of videos; some were autobiographical, while others were not. A machine-learning model was able to successfully classify the video categories above chance, both within and across participants, suggesting that there is a shared mechanism differentiating autobiographical experiences from non-autobiographical ones. Moreover, the classifier brain maps revealed that the fronto-parietal network, mid-temporal regions and extrastriate cortex were critical for differentiating between autobiographical and non-autobiographical memories. We argue that this novel paradigm captures the true nature of autobiographical memories, and is well suited to patients (e.g., with brain injuries) who may be unable to respond reliably to traditional experimental stimuli.


2021 ◽  
Vol 8 (1) ◽  
pp. 33-46
Author(s):  
Ishrat Alam

In the history of technology, the loom has come to occupy an important place. While the horizontal handloom has a comparatively simple mechanism, this is not true of the vertical drawloom, which through centuries has developed complex forms. The question of the latter’s presence in India in early times has aroused some controversy. The case is made in this article that it arrived in the thirteenth century from Iran but failed to supplant the handloom in most areas of textile production, except for carpet weaving, mainly in Kashmir.


2021 ◽  
Vol 03 (01) ◽  
pp. 17-24
Author(s):  
Nadia Slimani ◽  
Ilham Slimani ◽  
Nawal Sbiti ◽  
Mustapha Amghar

Traffic forecasting is a research topic debated by several researchers affiliated to a range of disciplines. It is becoming increasingly important given the growth of motorized vehicles on the one hand, and the scarcity of lands for new transportation infrastructure on the other. Indeed, in the context of smart cities and with the uninterrupted increase of the number of vehicles, road congestion is taking up an important place in research. In this context, the ability to provide highly accurate traffic forecasts is of fundamental importance to manage traffic, especially in the context of smart cities. This work is in line with this perspective and aims to solve this problem. The proposed methodology plans to forecast day-by-day traffic stream using three different models: the Multilayer Perceptron of Artificial Neural Networks (ANN), the Seasonal Autoregressive Integrated Moving Average (SARIMA) and the Support Machine Regression (SMOreg). Using those three models, the forecast is realized based on a history of real traffic data recorded on a road section over 42 months. Besides, a recognized traffic manager in Morocco provides this dataset; the performance is then tested based on predefined criteria. From the experiment results, it is clear that the proposed ANN model achieves highest prediction accuracy with the lowest absolute relative error of 0.57%.


2001 ◽  
Vol 41 (3) ◽  
pp. 344-364 ◽  
Author(s):  
Cally L. Waite

The community of Oberlin, Ohio, located in the northeast corner of the state, holds an important place in the history of the education of Black Americans. In 1834, one year after its founding, the trustees of Oberlin College agreed to admit students, “irrespective of color.” They were the only college, at that time, to adopt such a policy. Oberlin's history as the first college to admit Black students and its subsequent abolitionist activities are crucial to the discussion of Black educational history. Opportunities for education before the Civil War were not common for most of the American population, but for Blacks, these opportunities were close to nonexistent. In the South, it was illegal for Blacks to learn to read or write. In the North, there was limited access to public schooling for Black families. In addition, during the early nineteenth century there were no Black colleges for students to attend. Although Bowdoin College boasted the first Black graduate in 1827, few other colleges before the Civil War opened their doors to Black students. Therefore, the opportunity that Oberlin offered to Black students was extraordinarily important. The decision to admit Black students to the college, and offer them the same access to the college curriculum as their white classmates, challenged the commonly perceived notion of Blacks as childlike, inferior, and incapable of learning.


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