How do native grasses from South America handle zinc excess in the soil? A physiological approach

Author(s):  
Raissa Schwalbert ◽  
Gabriela Descovi Milanesi ◽  
Lincon Stefanello ◽  
Jean Michel Moura-Bueno ◽  
Gerson Laerson Drescher ◽  
...  
Botany ◽  
2012 ◽  
Vol 90 (11) ◽  
pp. 1113-1124 ◽  
Author(s):  
M.G. Fernández Pepi ◽  
A.F. Zucol ◽  
M.O. Arriaga

Festuca L. is one of the most representative native grasses of Tierra del Fuego in the southernmost area of South America. In several patches, however, domestic cattle have overgrazed, causing loss or replacement by exotic and adventitious species. We have carried out a comparative phytolith analysis of Patagonian fescue present in the Province of Tierra del Fuego. Fescue leaves are characterized by the presence of truncated cones, crescents, and sinuate trapezoid elements, predominantly short ones. Fan-shaped, small elongated prismatic, and point-shaped phytoliths, as well as articulated phytoliths originating in vascular and epidermal tissues, were observed less frequently. The most common articulated elements in leaf ashes are long cells and a combination of sinuate trapezoid and long cells or crescents. In inflorescence ash assemblages, long cells with undulate borders in association with crescents or emerging hooks are predominant. We have analyzed the diagnostic and differential characteristics of each species of phytolith assemblages to provide information for further studies on the presence of this species in different past soil samples.


2012 ◽  
Vol 5 (3) ◽  
pp. 357-363 ◽  
Author(s):  
Leopoldo J. Iannone ◽  
María V. Novas ◽  
Carolyn A. Young ◽  
José P. De Battista ◽  
Christopher L. Schardl
Keyword(s):  

2014 ◽  
Vol 41 (1) ◽  
pp. 113-123 ◽  
Author(s):  
Gary M. Fellers

Rollo Howard Beck (1870–1950) was a professional bird collector who spent most of his career on expeditions to the Channel Islands off southern California, the Galápagos Islands, South America, the South Pacific, and the Caribbean. Some of the expeditions lasted as long as ten years during which time he and his wife, Ida, were often working in primitive conditions on sailing vessels or camps set up on shore. Throughout these expeditions, Beck collected specimens for the California Academy of Sciences, the Museum of Vertebrate Zoology at Berkeley (California), the American Museum of Natural History, and the Walter Rothschild Museum at Tring, England. Beck was one of the premier collectors of his time and his contributions were recognized by having 17 taxa named becki in his honor. Of these taxa, Beck collected 15 of the type specimens.


2017 ◽  
Vol 44 (1) ◽  
pp. 122-129 ◽  
Author(s):  
A. Padfield

Charles Waterton was the eccentric “Lord of Walton Hall” near Wakefield in Yorkshire. His Wanderings in South America was first published in 1826; translated into French, German and Spanish, it was a best seller. He brought back wourali used by the Macoushi natives of British Guiana (now Guyana) for killing prey; there is a piece of it in the Wakefield Museum. This paper traces the history of wourali which paralyses its victims; its attempted medical use for rabies and tetanus and, though different from curare, its belated use in modern anaesthesia.


This book opens a cross-regional dialogue and shifts the Eurocentric discussion on diversity and integration to a more inclusive engagement with South America in private international law issues. It promotes a contemporary vision of private international law as a discipline enabling legal interconnectivity, with the potential to transcend its disciplinary boundaries to further promote the reality of cross-border integration, with its focus on the ever-increasing cross-border mobility of individuals. Private international law embraces legal diversity and pluralism. Different legal traditions continue to meet, interact and integrate in different forms, at the national, regional and international levels. Different systems of substantive law couple with divergent systems of private international law (designed to accommodate the former in cross-border situations). This complex legal landscape impacts individuals and families in cross-border scenarios, and international commerce broadly conceived. Private international law methodologies and techniques offer means for the coordination of this constellation of legal orders and value systems in cross-border situations. Bringing together world-renowned academics and experienced private international lawyers from a wide range of jurisdictions in Europe and South America, this edited collection focuses on the connective capabilities of private international law in bridging and balancing legal diversity as a corollary for the development of integration. The book provides in-depth analysis of the role of private international law in dealing with legal diversity across a diverse range of topics and jurisdictions.


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