The role of sesquiterpene lactones in contact hypersensitivity to some North and South American species of feverfew (Parthenium- Compositae)

1977 ◽  
Vol 3 (3) ◽  
pp. 155-162 ◽  
Author(s):  
Eloy Rodríguez ◽  
W. L. Epstein ◽  
J. C. Mitchell
Keyword(s):  
Sesquiterpene Lactones ◽  
Contact Hypersensitivity ◽  
South American ◽  
South American Species ◽  
North And South

Redescription and new records of Ontholestes brasilianus Bernhauer, 1906 (Coleoptera: Staphylinidae: Staphylininae) 

Zootaxa ◽  
2018 ◽  
Vol 4388 (1) ◽  
pp. 143
Author(s):  
VINÍCIUS COSTA-SILVA ◽  
ANGÉLICO ASENJO ◽  
ALFRED F. NEWTON ◽  
PATRICIA J. THYSSEN
Keyword(s):  
South America ◽  
New Records ◽  
South American ◽  
South American Species ◽  
Additional Species ◽  
Palearctic Species ◽  
Mistaken Identification ◽  
North And South America ◽  
First Time ◽  
North And South

The genus Ontholestes Ganglbauer includes 35 species distributed mainly in Eurasia, with a few additional species in Africa and North and South America (Herman, 2001; Yang & Zhou, 2012; Smetana & Shavrin, 2013; Rougemont, 2016). According to Asenjo et al. (2013), the South American record of the Palearctic species Ontholestes murinus (Linnaeus, 1758) for Brazil made by J. Guérin (1953) seems doubtful. Ontholestes murinus was recorded for the first time outside the Palaearctic region by Smetana (1981), from Newfoundland, in Canada, as an adventive species (e.g., Downie and Arnett, 1996; Brunke et al., 2011), but its occurrence in Brazil remains to be confirmed; if the Guérin (1953) record was based on a mistaken identification or mislabeled specimen, this would reduce the number of species distributed in this region from two to one. With respect to O. brasilianus Bernhauer, although it has been confirmed for Peru, Brazil and Argentina (Herman, 2001; Asenjo et al., 2013; Newton, 2015; Newton & Caron, 2015), no specific localities of occurrence have been reported since its description in 1906. Thus, to solve problems of misidentification with Neotropical species of this genus, in this study we redescribe Ontholestes brasilianus and provide the first illustrations of the beetle including its aedeagus and a short key for South American species. Additionally, new records from South America are listed here. 

Area, Continental Drift and Mammalian Diversity

Paleobiology ◽  
1975 ◽  
Vol 1 (2) ◽  
pp. 189-194 ◽  
Author(s):  
Karl W. Flessa
Keyword(s):  
Plate Tectonics ◽  
Continental Drift ◽  
Quantitative Modeling ◽  
South American ◽  
Land Bridge ◽  
Area Effect ◽  
Mammalian Faunas ◽  
Continental Area ◽  
North And South

Mammalian generic, familial, and ordinal diversities correlate significantly with continental area. The area effect is similar in form to that shown for true islands: S = kAz, where S is the diversity, A is the area, and k and z are fitted constants. For mammalian genera and continental area, z equals 0.33, for families, z equals 0.23, and for orders, z equals 0.13.The area effect permits quantitative modeling of extinction due to biotic competition between previously isolated faunas. The Late Cenozoic extinction of North and South American mammalian faunas following the rise of the Panamanian land bridge is overestimated by seven families. The overestimate may result from assumptions of complete biotic interchange and universal competition. The role of plate tectonics in regulating diversity may be extensively modified by regional environmental conditions.

scholarly journals Photographs of silos

2021 ◽  
Author(s):  
Catalina Mejía Moreno
Keyword(s):  
Le Corbusier ◽  
South American ◽  
Grain Elevators ◽  
Trade And Exchange ◽  
The Moment ◽  
The One ◽  
North And South ◽  
Walter Gropius ◽  
Do So

This article explores the dissemination of the photographs and photo-reproductions of the now-canonical North and South American grain elevators, published and disseminated in the early twentieth century in publications such as the 1913 Werkbund Yearbook where Walter Gropius included them as illustrations to his article, and later by Le Corbusier in Vers une architecture, amongst many others. It emphasises that while within architecture discourse the idea of a canon made up of buildings is widely accepted, this article identifies and stresses the role of ‘photographic canons’ as a means to further challenge these constructions. To do so, the article focuses on the moment where these photo-reproductions were consolidated as canonical and the mechanisms that such a construct implied. It investigates the photo-reproductions’ history as objects of trade and exchange, as well as their mobilisation in relation to photographic media and different dissemination platforms to argue that, on the one hand, that this informed their reading as architectural, and thus singular, objects. And on the other, that the materiality of the photo-reproductions’ different instances testifies to their nature as commodities and objects of trade, and therefore to the consolidation of their canonical status.

CYTOTAXONOMIC STUDIES ON NEW WORLD SPECIES OF ANEMONE (SECTION ERIOCEPHALUS) WITH TUBEROUS ROOTSTOCKS

1966 ◽  
Vol 44 (7) ◽  
pp. 899-928 ◽  
Author(s):  
Cecily Joseph ◽  
Margaret Heimburger
Keyword(s):  
North American ◽  
New World ◽  
Diploid Species ◽  
Pollen Grain ◽  
South American ◽  
New Taxon ◽  
South American Species ◽  
The North ◽  
Additional Support ◽  
North And South

The American species of Anemone L. (section Eriocephalus Hook. f. & Thoms.) with tuberous rootstocks were studied by biosystematic methods. Anemone caroliniana Walt., A. heterophylla Nutt. ex Torr. & Gray, A. tuberosa Rydb., and A. edwardsiana Tharp (tentatively) are recognized from North America and A. decapetala Ard., A. triternata Vahl, and A. cicutifolia Johnst. from South America. Karyotypes of the diploid species (2n = 16), A. heterophylla, A. tuberosa, A. decapetala, and A. triternata are described. They resemble the karyotype of A. caroliniana published earlier. Anemone edwardsiana and A. cicutifolia are also presumed diploid from stomatal and pollen grain studies. A new taxon (2n = 32), of undecided status, was obtained from Chile. North American plants included by authors in A. decapetala are here referred to A. heterophylla. The North and South American species appear to form two separate groups, the species of each continent being more closely related among themselves than to those of the other continent. Fewer stomata, larger chromosome size, and higher DNA content are characteristic of the North American species. Additional support for the separation of the two groups derives from limited meiotic studies which indicate a larger number of inversion differences in inter- than in intra-continental hybrids.

Taxonomy of the North and South American species of Hordeum section Hordeastrum

1986 ◽  
Vol 64 (8) ◽  
pp. 1745-1759 ◽  
Author(s):  
Bernard R. Baum ◽  
L. Grant Bailey
Keyword(s):  
South American ◽  
Discriminant Functions ◽  
South American Species ◽  
Morphometric Characters ◽  
The North ◽  
Discriminant Analyses ◽  
Morphological Species ◽  
New Evidence ◽  
North And South

The four species H. euclaston Steud., H. flexuosum Nees ex Steud., H. intercedens Nevski, and H. pusillum Nutt. have been regarded as conspecific by some authors, because of a lack of markers for distinguishing among the species. Bothmer and co-workers recently recognized the four species but were unable to demonstrate morphological discontinuities that could be used in keys to permit definite identification to species. This paper provides new evidence from lodicule and epiblast characters for existence of four species. A key based on the rachilla, lodicules, and epiblast is presented. Furthermore, carefully defined morphometric characters of the four species were analysed by various discriminant analyses techniques. These analyses confirm the recognition of four morphological species and enable identification by means of resulting discriminant functions in addition to and complementary to the key.

Cnidochloa: A New Genus of Grasses from Brazil (Poaceae: Panicoideae: Paniceae)

2020 ◽  
Vol 105 (2) ◽  
pp. 183-194
Author(s):  
Fernando O. Zuloaga ◽  
Sandra S. Aliscioni ◽  
M. Amalia Scataglini
Keyword(s):  
New Genus ◽  
Phylogenetic Position ◽  
South American ◽  
The South ◽  
South American Species ◽  
Molecular Characters

Generic boundaries of the South American species Panicum longipedicellatum Swallen are explored and compared with allied genera of the tribe Paniceae. On the basis of morphological, anatomical, and molecular characters a new genus, Cnidochloa Zuloaga, is proposed. The phylogenetic position of the new genus within the Paniceae is evaluated.

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