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San Miguel de Tucumán, Argentina

Piccinini M.,Municipalidad de Lujan | Sanchez Caro A.,National University of Lujan | Gultemiriam M.L.,UNT | Gultemiriam M.L.,CONICET | And 2 more authors.
International Journal of Environmental Research | Year: 2015

A 3-km reach of the Luján River was studied by establishing 6 sampling stations, which were from 300 to 500 m apart. The first station was the control reading for river nutrients and particulate material. The second station measured the continuous effluent from a wastewater treatment plant flow of the city of Luján and was, therefore, considered a continuous addition point of nutrients. The other 4 stations were used to evaluate whether the river captured phosphorus as phosphate, nitrogen as ammonium, nitrite or nitrates, and the suspended particulate material, both organic and inorganic. These data were used to calculate material uptake (U), uptake velocity (Vf), and net distance Snet under two different hydrological situations, during low and high flow, during the same season of the same year. Results indicate that phosphate ions as well as organic matter are retained for less than 2 km in both high and low flow situations. In the case of ammonium, the results appear similar to those of phosphate ions but it may be transformed into nitrates and transported in the latter form for greater distances. It is concluded that this river, in the reach under study, has a variable retention speed according to its flow but the retention capacity is no less than 900 m and as much as 2000 m. Therefore, a 2 km distance must be considered as the minimum distance before another effluent of nutrients or organic matter is added. © 2015, University of Tehran. All rights reserved. Source

Mercado Cardenas G.E.,Instituto Nacional de Tecnologia Agropecuaria | Galvan M.Z.,Instituto Nacional de Tecnologia Agropecuaria | Galvan M.Z.,CONICET | Barrera V.A.,Instituto Nacional de Tecnologia Agropecuaria | And 5 more authors.
Tropical Plant Pathology | Year: 2015

In Argentina, more than 60 % of the tobacco crops are grown in the northwestern part of the country and where Rhizoctonia solani leads to a reduction in crop yield and quality. In this study, 35 isolates of Rhizoctonia were obtained from 32 tobacco fields in northwestern Argentina and characterized by both morphological and molecular approaches. Based on the variability in the ITS region, isolates were identified as R. solani (80 %), Waitea circinata var. zeae (Rhizoctonia zeae) (8 %) and binucleate Rhizoctonia (8 %). Most isolates of R. solani belonged to the anastomosis groups (AGs) AG 4 HG-I (44 %), AG 2-1 (41 %) and AG 4 HG-III (13 %). Isolates of binucleate Rhizoctonia belonged to AG-F and AG-P of Ceratobasidium sp. Morphological variability was higher within isolates of AG 2-1 and AG 4 HG-III than within those of AG 4 HG-I. Aggressiveness of the isolates towards tobacco seedlings was assessed in the greenhouse. Isolates of AG 2-1 were the most aggressive on leaves, causing target spot, whereas isolates of AG 4 HG-I were the most aggressive on stems and roots, causing damping-off. © 2015, Sociedade Brasileira de Fitopatologia. Source

Ozbal G.,FBK | Strapparava C.,FBK | Mihalcea R.,UNT | Pighin D.,Polytechnic University of Catalonia
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

Colors have a very important role on our perception of the world. We often associate colors with various concepts at different levels of consciousnes and these associations can be relevant to many fields such as education and advertisement. However, to the best of our knowledge, there are no systematic approaches to aid the automatic development of resources encoding this kind of knowledge. In this paper, we propose three computational methods based on image analysis, language models, and latent semantic analysis to automatically associate colors to words. We compare these methods against a gold standard obtained via crowd-sourcing. The results show that each method is effective in capturing different aspects of word-color associations. © 2011 Springer-Verlag. Source

News Article
Site: http://cen.acs.org/news/ln.html

Computational chemist Angela Wilson will become the new director of the National Science Foundation’s chemistry division early next year. “I look forward to seeing chemistry from a little bit broader perspective,” Wilson says of the two-year NSF position. She replaces University of California, Davis, professor Jacquelyn Gervay-Hague, who left the agency in 2014. Wilson has worked since 2005 at the University of North Texas (UNT), where she leads a center for scientific . . .

News Article | March 27, 2016
Site: http://www.topix.com/energy/alt-energy

An audience listens to Cornell University professor Robert Howarth's presentation, done through Skype, on Friday at UNT's Environmental Education, Science and Technology building. Three experts discussed renewable energy and answered questions during a meeting on the Denton Renewable Plan.

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