A faunistic and ecological survey of the littoral Cladocera of Canada

1982 ◽  
Vol 60 (11) ◽  
pp. 2668-2682 ◽  
Author(s):  
R. Chengalath
Keyword(s):  
Total Dissolved Solids ◽  
Natural Sciences ◽  
National Museum ◽  
Substrate Preferences ◽  
Objective Standard ◽  
Regional Trends ◽  
Littoral Cladocera ◽  
The Relationship ◽  
European Populations ◽  
Occurrence Records

A total of 356 samples was collected and analysed from all the provinces and Northwest Territories of Canada. Nearly 2000 microscopic slides, mostly identified to the level of species, representing the littoral Cladocera of Canada were prepared. The samples, slides, and sorted populations are deposited in the Invertebrate collection of the National Museum of Natural Sciences, Ottawa, and form an objective standard for the identification of these animals for the interested biologist. During this study, 80 taxa of littoral cladocerans were recorded which includes all the species reported from Canada so far. Of these, three species are new to science. The distribution of species in Canada is given, providing several new occurrence records in the provinces and showing regional trends in the distribution. Outstanding taxonomic and morphological features, and the variation exhibited by some species are discussed. The differences between North American populations and European populations of some species are noted. The relationship between pH, total dissolved solids (TDS), and the diversity of littoral cladocerans as well as the substrate preferences exhibited by them, during this survey, are also discussed. Past Canadian records of chydorid cladocerans are critically examined and a list of species that have subsequently been synonymized or are of dubious validity is given.

Med. Dr. Adalbert Wraný (1836–1902) – doctor of medicine, mineral collector and donor to the National Museum in Prague

2019 ◽  
Vol 188 (1) ◽  
pp. 95-146
Author(s):  
Martin Bohatý ◽  
Dalibor Velebil
Keyword(s):  
Natural Science ◽  
Natural Sciences ◽  
The Other ◽  
National Museum ◽  
Industrial Chemistry ◽  
Pediatric Pathology ◽  
Geological Institute ◽  
History Of ◽  
Precious Stones

Adalbert Wraný (*1836, †1902) was a doctor of medicine, with his primary specialization in pediatric pathology, and was also one of the founders of microscopic and chemical diagnostics. He was interested in natural sciences, chemistry, botany, paleontology and above all mineralogy. He wrote two books, one on the development of mineralogical research in Bohemia (1896), and the other on the history of industrial chemistry in Bohemia (1902). Wraný also assembled several natural science collections. During his lifetime, he gave to the National Museum large collections of rocks, a collection of cut precious stones and his library. He donated a collection of fossils to the Geological Institute of the Czech University (now Charles University). He was an inspector of the mineralogical collection of the National Museum. After his death, he bequeathed to the National Museum his collection of minerals and the rest of the gemstone collection. He donated paintings to the Prague City Museum, and other property to the Klar Institute of the Blind in Prague. The National Museum’s collection currently contains 4 325 samples of minerals, as well as 21 meteorites and several hundred cut precious stones from Wraný’s collection.

On the American Species of Lyperopherus Mots. (Coleoptera: Carabidae)

1949 ◽  
Vol 81 (9) ◽  
pp. 231-232 ◽  
Author(s):  
W. J. Brown
Keyword(s):  
United States ◽  
The United States ◽  
Natural Sciences ◽  
National Museum ◽  
United States National Museum ◽  
Comparative Zoology ◽  
Academy Of Natural Sciences

The following notes are based on the material in the Canadian National Collection and in the collections of the United States National Museum, the Museum of Comparative Zoology, and the Philadelphia Academy of Natural Sciences.In all of the three American species of Lyperopherus, the flattened side margins of the pronotum are gradually widened posteriorly to include the outer of the basal impressions. All are flightless and have the elytra widest slightly behind the middle.

scholarly journals Hvem publiserer hva? Hvordan kjønn påvirker publiseringsgrad

2021 ◽  
pp. 99-118
Author(s):  
Øystein Gullvåg Holter ◽  
Lotta Snickare ◽  
Greta Gober
Keyword(s):  
Natural Sciences ◽  
Scholarly Publishing ◽  
And Gender ◽  
Number Of Publications ◽  
University Of Oslo ◽  
The University ◽  
The Relationship ◽  
Gender Influences ◽  
Publishing Practices

Who is Publishing What? How Gender Influences Publication This chapter examines scholarly publishing within the Faculty of Mathematics and Natural Sciences at the University of Oslo from a gendered perspective. The question posed is whether women publish less than men, and if so, why. Based on self-reported publishing volumes, the study applies multivariable methods to investigate the relationship between the number of publications and factors such as position, total worktime and gender. The analyses show that gender has little significance when these other factors are entered into the model. The results are discussed in light of other studies on publishing practices.

scholarly journals Explanation and Understanding as Methods of Historical and Biographical Cognition

2021 ◽  
Vol 8 ◽  
pp. 3-9
Author(s):  
Mykola Bakaiev
Keyword(s):  
Causal Explanation ◽  
Natural Sciences ◽  
History Of Ideas ◽  
Biographical Research ◽  
Rational Explanation ◽  
History Of ◽  
Relationship Of ◽  
The Relationship ◽  
Understanding Function

Traditionally, explanation is considered to be the method of natural sciences and understanding to be the method of humanities. However, this paper considers both to be methods of history. Namely, the author focuses on how explanation and understanding function in history in general and in biography in particular. Referring to biographical realm helps explicate the specifics of explanation and understanding as well as broaden the view about their uses in humanities. In the first part, the author refers to explanation and understanding in history as such. In particular, causal explanation (explanatory sketch by Karl Hempel) and rational explanation (history of ideas by Mark Bevir) are considered in the paper along with the relationship of hermeneutic notion of understanding with the two. The second part of the paper deals with the functioning of explanation and understanding in biographical research. Namely, it considers biographical understanding by Tilmann Habermas and Neşe Hatiboğlu as well as cases of causal and rational explanations in biographical research. In particular, it is shown that while causal explanation occurs in biography as explanatory sketch, it is not a separate distinct notion. It is also shown that rational explanation is used in biographical reconstructions in order to clarify the influence of particular events on beliefs of people. Based on the materials involved, the author demonstrates the specifics of explanation and understanding in biography compared to their usage in historical cognition in general.

The Relationship of Cambridge GCE Results with the Jamaican Graduate Output from UWI

1975 ◽  
Vol 2 (2) ◽  
pp. 101-118
Author(s):  
Marlene Hamilton
Keyword(s):  
West Indies ◽  
Natural Sciences ◽  
The West ◽  
Main Interest ◽  
The University ◽  
Relationship Of ◽  
The Relationship

This paper seeks to investigate possible links between Cambridge examination results in the General Certificate of Education "O" and "A" level examinations over the years, and the annual Jamaican graduate output from the University of the West Indies. Although all faculties are considered, the main interest lies in numbers of graduates from the faculties of Natural Sciences, Engineering, Agriculture and Medicine, linked with passes gained in science subjects at both "O" and "A" level GCE examinations.

Photographs are to think with

2020 ◽  
pp. 1-35
Author(s):  
Christopher Morton
Keyword(s):  
Natural Sciences ◽  
Colonial Administration ◽  
The Relationship ◽  
The Way

Chapter 1 sets out the main arguments and contexts of the book. It begins with a discussion of why using the photographic archive to explore the fieldwork on which Evans-Pritchard’s celebrated writings was based is so transformative. It discusses the relationship between anthropology and colonialism in the 1920s and 1930s, and Evans-Pritchard’s equivocal positioning within this as someone directly funded by the colonial administration and yet having a critical relationship to it. It explores the way in which Evans-Pritchard sought to move anthropology away from the natural sciences and towards history and the humanities. It compares his fieldwork photography to other anthropologists of the period and challenges the assumption that anthropology in the period was not a visual endeavour.

Narration and Explanation: The Relationship between Theology and Natural Sciences

2017 ◽  
Vol 31 (2) ◽  
pp. 172-188
Author(s):  
Oswald Bayer ◽  
Roy A. Harrisville
Keyword(s):  
Natural Sciences ◽  
The Relationship

scholarly journals ¿Ayudan los libros de texto a comprender la realidad fluvial de la ciudad?

2019 ◽  
pp. 209
Author(s):  
Agustín Cuello Gijón ◽  
Francisco, F. García Pérez
Keyword(s):  
Social Sciences ◽  
Content Analysis ◽  
Economic Value ◽  
Natural Sciences ◽  
Urban Environments ◽  
Frequent Use ◽  
Domestic Savings ◽  
The Relationship ◽  
The City ◽  
Economic Value Of Water

Resumen: Se analiza el tratamiento de la idea de río y sus relaciones con la ciudad en los libros de texto de Educación Secundaria, con el fin de valorar su influencia en la comprensión de los fenómenos fluviales en entornos urbanos por los escolares. Se han revisado textos de ciencias naturales y ciencias sociales de uso frecuente en España y se han sometido a análisis de contenido mediante selección y tratamiento de unidades de información, siguiendo un sistema de categorías relacionadas con el concepto de río y su interacción con la ciudad. Se concluye que la relación ciudad-río tiene escasa presencia en los libros de texto, está marcada por el valor económico del agua, el río como amenaza y en el ahorro doméstico como único compromiso. Esta visión mercantilista, antropocéntrica y superficial no facilita el aprendizaje crítico de la realidad ni ayuda al cambio necesario en las relaciones de las ciudades con sus ríos.Abstract: The treatment of the idea of river and its relations with the city is analyzed in Secondary Education textbooks, in order to assess its influence on the understanding of fluvial phenomena in urban environments by schoolchildren. Texts of natural sciences and social sciences of frequent use in Spain have been reviewed and have been subjected to content analysis by selection and treatment of information units, following a system of categories related to the river concept and its interaction with the city. It is concluded that the relationship city-river has little presence in textbooks, is marked by the economic value of water, the river as a threat and in domestic savings as the only commitment. This mercantilist, anthropocentric and superficial vision does not facilitate the critical learning of reality or help the necessary change in the relationships between cities and their rivers.

scholarly journals Platina in the 18th century: mineralogy of the crude concentrate used in the first modern attempts at refining platinum

2020 ◽  
Vol 84 (2) ◽  
pp. 289-299 ◽  
Author(s):  
Fernando Gervilla ◽  
Javier García-Guinea ◽  
Luis Fermín Capitán-Vallvey
Keyword(s):  
18Th Century ◽  
Platinum Metal ◽  
Natural Sciences ◽  
Heavy Mineral ◽  
Chromian Spinel ◽  
National Museum ◽  
Applied Chemistry ◽  
Late 18Th Century ◽  
Fe Alloys ◽  
Native Bismuth

AbstractA platina sample brought to Spain in the last quarter of the 18th century is nowadays exhibited at the National Museum of Natural Sciences in Madrid. It originated from the ancient Mineralogical Museum of the School of Applied Chemistry at El Turco Street in Madrid and most probably corresponds to the material used by François Chabaneau for his experiments to purify platinum metal in the late 18th century. The sample is a heavy-mineral concentrate consisting of Pt–Fe alloys and gold nuggets associated with ilmenite–hematite, chromian spinel, goethite and minor quartz, sphene, rutile, magnetite, hornblende, garnet, calcite, pyrite, native bismuth and bismite. The Pt–Fe alloys exhibit a characteristic composition (81.97–90.75 wt.% Pt and 5.08–10.81 wt.% Fe with minor amounts of Cu, Os, Ir, Ru, Rh and Pd) and mineralogy of solid inclusions (abundant inclusions of Ir alloy as well as Os alloy, laurite–erlichmanite, bowieite, tulameenite and undetermined Pt–Pd–Ir–Rh antimonides and tellurides) that are very similar to those Pt–Fe alloys currently mined in western Colombia (the Chocó Department). These features allow us to discuss the provenance of the sample (probably from the proximal or medial reaches of any of the Chocó rivers) and evaluate the suitability of the Chabaneau's method for purifying platina. Our results show that the method became effective only with platina samples depleted or lacking iridium.

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