scholarly journals Research in Petroleum and Environment: A Bibliometric Analysis in South America

2021 ◽  
Vol 16 (6) ◽  
pp. 1109-1116
Author(s):  
Gricelda Herrera-Franco ◽  
Néstor Montalván-Burbano ◽  
Carlos Mora-Frank ◽  
Lucrecia Moreno-Alcívar
Keyword(s):  
South America ◽  
Environmental Pollution ◽  
Environmental Remediation ◽  
Relevant Information ◽  
The United States ◽  
Intellectual Structure ◽  
South American ◽  
Field Of Study ◽  
Pollution Effects ◽  
Petroleum Derivatives

Petroleum is a crucial resource that has globally influenced the scientific community and socio-economic development. However, its industrial processes negatively affect the natural environment. This research aims to analyse the intellectual structure of the petroleum and environment relationship in South American countries' contributions through bibliometric methods. The study presents a methodology: i) establishing search criteria; ii) initial search results; iii) refinement of results; iv) data analysis. Bibliometric methods were incorporated to analyse the performance of scientific production, and its mapping, allowing to reveal its structure. The results show a growth of this field of study (538 articles) through the contribution of countries, institutions and authors. Most of the studies related to oil and environment carried out by Brazil (399 articles) have a strong collaboration with Argentina, Colombia and Uruguay and partnerships with countries outside the region such as the United States, United Kingdom, and Spain. In addition, seven research themes were found (Biomarkers-petroleum derivatives, bioremediation, bioproductive processes, hydrocarbon-environmental, pollution effects, mangrove pollution, oil spill-simulation). This study provided relevant information on environmental pollution reflected in diverse sectors of South America (coastal and Amazonian areas). It showed several environmental remediation methods focused on microorganisms, biosurfactants, microbial residues, ionic processes and phytoremediation. Therefore, this research allows us to obtain meaningful and current information on the art state in this field of study.

scholarly journals Brazil and the institutionalization of South America: from hemispheric estrangement to cooperative hegemony

2011 ◽  
Vol 54 (2) ◽  
pp. 189-211 ◽  
Author(s):  
Carlos Gustavo Poggio Teixeira
Keyword(s):  
United States ◽  
South America ◽  
Free Trade ◽  
Free Trade Area ◽  
The United States ◽  
South American ◽  
The South ◽  
Trade Area

This article argues that Brazil went from a posture of estrangement in relation to the hemispheric project represented by the Free Trade Area of the Americas (FTAA) to a strategy of cooperative hegemony aimed at institutionalizing the South American space and increasing the costs of the FTAA for the United States. Although Brazil was initially isolated, US lack of leadership combined with events at the subregional level ended up turning the tide in the direction of Brazilian interests. These factors help to understand the current institutional configuration of South America.

scholarly journals Molecular Detection of Peronospora variabilis in Quinoa Seed and Phylogeny of the Quinoa Downy Mildew Pathogen in South America and the United States

2014 ◽  
Vol 104 (4) ◽  
pp. 379-386 ◽  
Author(s):  
Anna L. Testen ◽  
María del Mar Jiménez-Gasco ◽  
José B. Ochoa ◽  
Paul A. Backman
Keyword(s):  
United States ◽  
South America ◽  
Downy Mildew ◽  
Detection Method ◽  
Chenopodium Quinoa ◽  
The United States ◽  
Human Consumption ◽  
South American ◽  
Geographical Differences ◽  
Polymerase Chain

Quinoa (Chenopodium quinoa) is an important export of the Andean region, and its key disease is quinoa downy mildew, caused by Peronospora variabilis. P. variabilis oospores can be seedborne and rapid methods to detect seedborne P. variabilis have not been developed. In this research, a polymerase chain reaction (PCR)-based detection method was developed to detect seedborne P. variabilis and a sequencing-based method was used to validate the PCR-based method. P. variabilis was detected in 31 of 33 quinoa seed lots using the PCR-based method and in 32 of 33 quinoa seed lots using the sequencing-based method. Thirty-one of the quinoa seed lots tested in this study were sold for human consumption, with seed originating from six different countries. Internal transcribed spacer (ITS) and cytochrome c oxidase subunit 2 (COX2) phylogenies were examined to determine whether geographical differences occurred in P. variabilis populations originating from Ecuador, Bolivia, and the United States. No geographical differences were observed in the ITS-derived phylogeny but the COX2 phylogeny indicated that geographical differences existed between U.S. and South American samples. Both ITS and COX2 phylogenies supported the existence of a Peronospora sp., distinct from P. variabilis, that causes systemic-like downy mildew symptoms on quinoa in Ecuador. The results of these studies allow for a better understanding of P. variabilis populations in South America and identified a new causal agent for quinoa downy mildew. The PCR-based seed detection method allows for the development of P. variabilis-free quinoa seed, which may prove important for management of quinoa downy mildew.

scholarly journals Cation Exchange of Natural Zeolites: Worldwide Research

2021 ◽  
Vol 13 (14) ◽  
pp. 7751
Author(s):  
Fernando Morante-Carballo ◽  
Néstor Montalván-Burbano ◽  
Paúl Carrión-Mero ◽  
Nathaly Espinoza-Santos
Keyword(s):  
Cation Exchange ◽  
Environmental Remediation ◽  
Metal Removal ◽  
Academic Discipline ◽  
Heavy Metal Removal ◽  
Cognitive Structure ◽  
The United States ◽  
Intellectual Structure ◽  
Natural Zeolites ◽  
Growth Trend

Research on natural zeolites (NZ) has increased over the years, showing potential in different areas, and many of them involve cation exchange (CE), considered one of the essential properties of NZ. This work aims to identify studies’ cognitive structure based on the cation exchange capacity (CEC) of NZ through bibliometric analysis to evaluate scientific production, growth trend, and visualization through bibliometric maps using the VOSviewer software. All types of documents and all languages indexed in Scopus from 1970 to 2020 were considered for the database, obtaining 703 documents. The results indicate an increasing trend in CE annual publications in NZ. This analysis shows the most influential authors such as Daković, Wang and Colella, while the countries that stand out are China, Turkey and the United States. Besides, the bibliometric maps made it possible to understand the intellectual structure of this academic discipline, identifying areas of current and potential interest in this field of studies such as its application in medicine, agriculture, catalysts, heavy metal removal, wastewater treatment (WWT), bioremediation and construction. Finally, these studies showed trends in science and technology studies favoring environmental remediation and human health.

scholarly journals Brasil: ator unipolar na América do Sul?

2016 ◽  
Vol 11 (1) ◽  
pp. 274
Author(s):  
Lucas Pereira Rezende
Keyword(s):  
South America ◽  
Armed Forces ◽  
The United States ◽  
Defense Spending ◽  
South American ◽  
Post Cold War ◽  
Military Capability ◽  
Qualitative Survey ◽  
The Us ◽  
Size Population

Esse artigo busca fazer um estudo da balança de poder na América do Sul, através de um levantamento quantitativo e qualitativo de 15 indicadores de poder: (1) tamanho da população; (2) tamanho do Produto Interno Bruto; (3) os Correlates of War (COW); (4) os gastos absolutos em defesa; (5) o percentual do PIB gasto em defesa; (6) o número total de efetivos nas Forças Armadas ativas; (7) o total de efetivos nos Exércitos; (8) o total de efetivos nas Marinhas; (9) o total de efetivos nas Forças Aéreas; (10) o total de veículos blindados; (11) o total de peças de artilharia; (12) o total de submarinos; (13) o total de embarcações de guerra; (14) o total de aviões de combate; e (15) o índex Global Fire Power. Partindo dos indicadores comumente utilizados pela literatura para medir poder, como o tamanho do PIB, os COW e os gastos em defesa - indicadores utilizados por Wohlforth (1999 e 2009) para sustentar a unipolaridade estadunidense, o Brasil seria, também, uma unipolaridade da América do Sul. Todavia, quando adicionamos os outros indicadores específicos de mensuração da capacidade militar atual sul-americana, vimos que a tendência brasileira à unipolaridade não se sustenta. Há uma grande defasagem, em termos comparativos, das Forças Armadas brasileiras frente às demais na América do Sul, levando em consideração seu tamanho territorial, populacional e PIB. Isso faz com que, por esses outros indicadores, observássemos uma tendência a uma multipolaridade desequilibrada. Mesmo que tenha programas de reaparelhamento de suas Forças Armadas, o Brasil não é o único a fazê-lo. Isso pode indicar que, tal qual se observou no campo global com os Estados Unidos no pós-Guerra Fria, a unipolaridade brasileira possa ser um fenômeno de curta duração, ainda que a maioria dos indicadores mostre estar, do início do século até 2013, em ascendência. Abstract This article seeks to make a study of the balance of power in South America through a quantitative and qualitative survey of 15 power indicators: (1) size of the population; (2) size of gross domestic product; (3) the Correlates of War (COW); (4) the absolute defense spending; (5) the percentage of GDP spent on defense; (6) the total number of personnel in the active military; (7) the total personnel in Armies; (8) the total personnel in Marine; (9) the total personnel in the Air Force; (10) the total number of armored vehicles; (11) the total number of artillery pieces; (12) total figure of submarines; (13) total figure of war vessels; (14) the total number of combat aircrafts; and (15) the index Global Fire Power. Based on the indicators commonly used in the literature to measure power, as the size of GDP, the COW and defense spending - indicators used by Wohlforth (1999 and 2009) to support the US unipolarity, Brazil was also a unipolar power in South America. However, when we add other specific indicators to measure the current military capability of South American states, we see the Brazilian tendency to unipolarity does not hold. There is a large gap, in comparative terms, between the Brazilian Armed Forces and the other South American actors, taking into account their territorial size, population and GDP. Taking these indicators into account, we could describe the system as an unbalanced multipolarity. Even if there is a re-equipment program of its armed forces, Brazil is not the only one to do so. This may indicate that, as it was observed in the global system with the United States in the post-Cold War, the Brazilian unipolarity may be a short-term phenomenon, although most indicators show that, from the beginning of the century to 2013, Brazilian capabilities were rising.

scholarly journals International Surveillance of Bloodstream Infections Due to Candida Species: Frequency of Occurrence and Antifungal Susceptibilities of Isolates Collected in 1997 in the United States, Canada, and South America for the SENTRY Program

1998 ◽  
Vol 36 (7) ◽  
pp. 1886-1889 ◽  
Author(s):  
M. A. Pfaller ◽  
R. N. Jones ◽  
G. V. Doern ◽  
H. S. Sader ◽  
R. J. Hollis ◽  
...  
Keyword(s):  
United States ◽  
South America ◽  
Bloodstream Infections ◽  
The United States ◽  
South American ◽  
Frequency Of Occurrence ◽  
Species Frequency ◽  
International Program ◽  
Medical Centers ◽  
Geographic Differences

An international program of surveillance of bloodstream infections (BSIs) in the United States, Canada, and South America between January and December 1997 detected 306 episodes of candidemia in 34 medical centers (22 in the United States, 6 in Canada, and 6 in South America). Eighty percent of the BSIs were nosocomial and 50% occurred in patients hospitalized in an intensive care unit. Overall, 53.3% of the BSIs were due to Candida albicans, 15.7% were due toC. parapsilosis, 15.0% were due to C. glabrata, 7.8% were due to C. tropicalis, 2.0% were due to C. krusei, 0.7% were due to C. guilliermondii, and 5.8% were due to Candida spp. However, the distribution of species varied markedly by country. In the United States, 43.8% of BSIs were due to non-C. albicansspecies. C. glabrata was the most common non-C. albicans species in the United States. The proportion of non-C. albicans BSIs was slightly higher in Canada (47.5%), where C. parapsilosis, not C. glabrata, was the most common non-C. albicansspecies. C. albicans accounted for 40.5% of all BSIs in South America, followed by C. parapsilosis (38.1%) andC. tropicalis (11.9%). Only one BSI due to C. glabrata was observed in South American hospitals. Among the different species of Candida, resistance to fluconazole (MIC, ≥64 μg/ml) and itraconazole (MIC, ≥1.0 μg/ml) was observed with C. glabrata and C. krusei and was observed more rarely among other species. Isolates of C. albicans,C. parapsilosis, C. tropicalis, and C. guilliermondii were all highly susceptible to both fluconazole (99.4 to 100% susceptibility) and itraconazole (95.8 to 100% susceptibility). In contrast, 8.7% of C. glabrata isolates (MIC at which 90% of isolates are inhibited [MIC90], 32 μg/ml) and 100% of C. krusei isolates were resistant to fluconazole, and 36.9% of C. glabrata isolates (MIC90, 2.0 μg/ml) and 66.6% of C. kruseiisolates were resistant to itraconazole. Within each species there were no geographic differences in susceptibility to fluconazole or itraconazole.

Orogenic Convection in Subtropical South America as Seen by the TRMM Satellite

2011 ◽  
Vol 139 (8) ◽  
pp. 2399-2420 ◽  
Author(s):  
Kristen L. Rasmussen ◽  
Robert A. Houze
Keyword(s):  
South America ◽  
Tropical Rainfall Measuring Mission ◽  
The United States ◽  
South American ◽  
Convective Storms ◽  
Mountain Ranges ◽  
Low Level ◽  
Global Understanding ◽  
Low Level Jet ◽  
Downslope Flow

AbstractExtreme orogenic convective storms in southeastern South America are divided into three categories: storms with deep convective cores, storms with wide convective cores, and storms containing broad stratiform regions. Data from the Tropical Rainfall Measuring Mission satellite’s Precipitation Radar show that storms with wide convective cores are the most frequent, tending to originate near the Sierra de Cordoba range. Downslope flow at upper levels caps a nocturnally enhanced low-level jet, thus preventing convection from breaking out until the jet hits a steep slope of terrain, such as the Sierra de Cordoba Mountains or Andean foothills, so that the moist low-level air is lifted enough to release the instability and overcome the cap. This capping and triggering is similar to the way intense convection is released near the northwestern Himalayas. However, the intense storms with wide convective cores over southeastern South America are unlike their Himalayan counterparts in that they exhibit leading-line/trailing-stratiform organization and are influenced by baroclinic troughs more similar to storms east of the Rocky Mountains in the United States. Comparison of South American storms containing wide convective cores with storms in other parts of the world contributes to a global understanding of how major mountain ranges influence precipitating cloud systems.

Study on Mining Materials Products of Central and South America

2014 ◽  
Vol 484-485 ◽  
pp. 581-584
Author(s):  
Ying Li ◽  
Qi Shen Chen ◽  
Jian Wu Li ◽  
Qun Yi Liu
Keyword(s):  
United States ◽  
Economic Development ◽  
South America ◽  
Regional Economic Development ◽  
The United States ◽  
South American ◽  
Regional Economic ◽  
Export Strategy ◽  
The Future

There are rich resources in Central and South America, and mining products export plays an important role in the regional economic development. In this paper, the mining products trade information of more than ten years in Central and South America is collected, and then the authors point out that a "diversified export" strategy has been implemented by Central and South America in recent years for reducing the dependence on the economy of the United States, and the export of Central and South America is continuously rising to China but declining to the United States because they are benefited from the great demands of China's development on resources. However, along with the development of the industrialization in the countries of Central and South America, increasingly more resources will be consumed in this region. Therefore, some Central and South American countries will reduce their energy and mining products exports in the future in the condition of meeting their own needs.

scholarly journals Volcanic Geomorphology: A Review of Worldwide Research

Geosciences ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 347 ◽  
Author(s):  
Paúl Carrión-Mero ◽  
Néstor Montalván-Burbano ◽  
Nataly Paz-Salas ◽  
Fernando Morante-Carballo
Keyword(s):  
Academic Research ◽  
Relevant Information ◽  
Scientific Production ◽  
Intellectual Structure ◽  
Current Status ◽  
Current Interest ◽  
Field Of Study ◽  
Author Keywords ◽  
Extensive Information ◽  
Scopus Database

The purpose of this article is to provide an overview of academic research on volcanic geomorphology, through the use of bibliometric analysis and bibliographic visualization maps for the discernment of its growing interest by the academy in the last 30 years. It is sustained on the publications indexed in the Scopus database between 1956 and 2019, obtaining relevant information on scientific production, following the methodological structure of a rigorous bibliometric process, which ranges from the search for descriptors or keywords to the configuration of visualizations of tables and maps that allowed to consider the contributions by authors, institutions, journals and topics that have shaped the evolution of this field of study. The generations of bibliometric maps allowed understanding the intellectual structure of the field of study made up of 707 articles where the analysis of co-occurrence of author keywords showed six main lines of research that, combined with the co-citation maps, allowed understanding the breadth of intellectual structure. Extensive information is provided on the thematic that other investigations partially addressed or failed to capture their current status. Considering that the results allow us to identify areas of current interest and the potential of research in volcanic geomorphology.

Different Profiles, Different Choices: Mid-Nineteenth Century Hessians Who Emigrated to the Southern Hemisphere

2017 ◽  
Vol 41 (3) ◽  
pp. 415-444 ◽  
Author(s):  
Simone A. Wegge
Keyword(s):  
United States ◽  
Nineteenth Century ◽  
South America ◽  
Southern Hemisphere ◽  
The United States ◽  
South American ◽  
Migration Strategy ◽  
Socioeconomic Characteristic ◽  
Intact Families

Before 1890, German emigrants were one of the largest European groups to emigrate overseas in the middle of the nineteenth century. Most of them settled in North America, but a handful of Germans landed in countries south of the equator. This article examines those who chose uncommon paths and settled in the Southern Hemisphere, focusing on Hessians who went to either Australia or South America. Those who emigrated to the Southern Hemisphere were quite different from the Hessians who moved to the United States. More striking, however, are the contrasting backgrounds of the Australian-bound versus the South American–bound groups: These two groups were comparable in size, but in terms of any identifying socioeconomic characteristic they were poles apart from each other. Those bound for Australia were poorer, less skilled, and more likely to use a multiyear migration strategy to get their family members across the ocean, typical of the ways of those bound for the United States. In contrast, those who went to South America were wealthier, more skilled, and mostly emigrated as intact families without the use of such migration networks. This work shows that the choice of destination mattered for individuals and that certain destinations attracted particular types of individuals and groups, reemphasizing the role of self-selection in the migration experience.

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