10
10
20655
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https://socictopen.socict.org/files/original/0a3372e7593a391154fb2ba954906af2.pdf
a5d00c61764a20020b40a43e06def627
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Title
A name given to the resource
Coronavirus
Description
An account of the resource
Dominio científico: Coronavirus
Text
A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.
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Title
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The production of novolac oligomers
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A. N. Galushchinsky, K. L. Obydennov
Description
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The paper presents the improvement of production technology of novolac phenol-formaldehyde oligo-mers by introducing the new scheme of capture of exhaust gases due to waste production, which leads to a reduction of costs and increase economic efficiency. The calculation of the material balance of the pro-duction of novolac phenol-formaldehyde oligomer at 300 kg/h of technical product is performed, the technological calculation of the basic equipment and selection of auxiliary equipment is produced. The apparatus scheme of production is made and the description of the process is represented. The draft of the main reactor is made.
Date
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2016
Subject
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фенол, формалин, щавелевая кислота, новолак, олигомер, реакция поликонденсации, материальные расчеты, технология производства, аппаратурная схема
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DOI: 10.15826/chimtech.2016.3.4.016
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Chimica Techno Acta
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Uralʹskij federalʹnyj universitet imeni pervogo Prezidenta Rossii B.N. Elʹcina
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Chemistry
Language
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EN, RU
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https://socictopen.socict.org/files/original/52352df3859dc53c5ecb0ac5431fac8e.pdf
a1d63d850e4be4a0634aa73e391280d4
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The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Coronavirus
Description
An account of the resource
Dominio científico: Coronavirus
Text
A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.
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Title
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Analysis of Discussions within the Chinese Society on China’s Position in World in the Context of Sino-American Relations Deterioration during the Pandemic Period
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A. N. Karneev, A. S. Pyatachkova
Description
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During the pandemic, Sino-US relations have remarkably deteriorated. The institutionalization of such destructive practices as toughening rhetoric in the media and sanctions is becoming obvious. As the model of bilateral relations is now aimed at decoupling the degradation will continue. These trends inevitably affect the mood of the Chinese society. The article analyzes opinions on foreign policy in Chinese society in the context of Sino American relations within the pandemic period. The work is divided into two parts: the first assesses general trends in US-China relations. The second part traces the current trends in the modern ideological and political atmosphere in Chinese society. The episode with congratulations to the Chinese public from the American administration on the occasion of the 101st anniversary of the famous «May 4, 1919 movement» is analyzed as a case study. The research shows that this event received ambiguous and even opposite assessments: part of the society saw in it as an attempt to accuse China of the spread of coronavirus and the imposition of Western values. Another part emphasized M. Pottinger’s rather high level of spoken Chinese and noted that the very fact of congratulation can be viewed as a positive moment for bilateral relations. There were also positions combining both approaches. The case under consideration reveals the danger of decoupling initiated by the parties. The tension between the PRC and the United States leads to the fact that the partners are starting to interpret each other’s intentions as presumably hostile, even taking into account such a formally favorable occasion as congratulations on a significant historical date. Meanwhile, it seems that the presence of positive interpretations against the background of a general deterioration in bilateral relations also cannot be ignored. Although public opinion cannot be unambiguous and does not always directly influence specific political steps, it is important to take into account the full range of opinions for an objective and comprehensive analysis of Sino American relations.
Date
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2020
Subject
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coronavirus pandemic, Chinese Foreign Policy, Sino-American relations, foreign policy discussions within chinese society, may 4th movement, values and historical memory in chinese society
Identifier
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10.24411/2221-3279-2020-10054
Source
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Sravnitelʹnaâ Politika
Publisher
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Jurist, Publishing Group
Coverage
The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant
Political science (General)
-
https://socictopen.socict.org/files/original/825a1f1208dd7edee90de77b66390ea9.pdf
8abfa698b0c96869656804ff347a1d87
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Title
A name given to the resource
Coronavirus
Description
An account of the resource
Dominio científico: Coronavirus
Text
A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.
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Title
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Angiotensin II and COVID-19. Secrets of interactions
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A. O. Konradi, A. O. Nedoshivin
Description
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The article describes current data on the relationship of renin-angiotensin system and related drugs with the risk of COVID-19 infection and its outcomes. Analysis of the latest publications did not reveal association of angiotensin-converting enzyme inhibitors and angiotensin II receptor blockers with any risk of an unfavorable outcomes, and there was no data for withdrawal of these drugs.
Date
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2020
Subject
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covid-19, angiotensin-converting enzyme 2, angiotensin converting enzyme inhibitors
Identifier
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10.15829/1560-4071-2020-3861
Source
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Российский кардиологический журнал
Publisher
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«FIRMA «SILICEA» LLC
Coverage
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Diseases of the circulatory (Cardiovascular) system
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https://socictopen.socict.org/files/original/2d4b930347aeb6cffd1da49e6a6351fb.pdf
d65ebba04268e768597d87aa4ae2af71
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Title
A name given to the resource
Agricultura sostenible
Description
An account of the resource
Dominio científico: Agricultura sostenible
Text
A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.
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Title
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Caracterização de resíduos orgânicos retirados de salinas e possibilidades de seu uso como fertilizante
Creator
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A. P. Araújo, B. M. Perlingeiro
Description
An account of the resource
A desativação de salinas em Cabo Frio, estado do Rio de Janeiro, vem gerando grande quantidade de resíduos orgânicos, originados do acúmulo de algas marinhas. Em 1996, estudos realizados na UFRRJ avaliaram o potencial de aproveitamento desses resíduos como fertilizantes orgânicos. Amostras do resíduo apresentaram altos teores de Ca, Mg, K, Na e S, elevados valores de densidades aparente e real, retenção de água, pH e condutividade elétrica; 89% do conteúdo de Na encontrava-se em formas solúveis, possibilitando sua remoção por lavagens. Efetuou-se um ensaio para dessalinização do resíduo, quando aplicado ao solo arenoso local, em esquema fatorial 4 x 5: quatro misturas resíduo:solo (0:1, 1:100, 1:50 e 1:10 em peso), combinadas com cinco doses de gesso (0, 1/2, 1, 2 e 4 vezes a necessidade de gesso) com três repetições, sendo efetuadas sete aplicações de água. Na mistura 1:10, houve pequena percolação decorrente da grande viscosidade. Do total lixiviado de Ca, Mg e Na, 66, 86 e 98%, respectivamente, foram removidos nas duas primeiras lavagens. A adição do resíduo aumentou os teores de água, C, N, P, Ca e Mg das misturas ao final do ensaio, quando comparadas ao solo puro. O gesso não teve efeito na lixiviação do Na e no teor final de Na trocável. As lavagens removeram cerca de 90% do Na e reduziram a salinidade, mas as misturas mantiveram caráter sódico ao final do ensaio. A viabilidade de aproveitamento do resíduo está condicionada aos custos de seu tratamento, quando comparados à aquisição de outro adubo orgânico.
Date
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1999
Subject
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Adubo orgânico, Algas marinhas, Salinidade, gesso, sodio
Identifier
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10.1590/S0100-06831999000200026
Source
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Revista Brasileira de Ciência do Solo
Publisher
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Sociedade Brasileira de Ciência do Solo
Coverage
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Agriculture (General)
Relation
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<a href="http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06831999000200026&lng=en&tlng=en" target="_blank" rel="noreferrer noopener">http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06831999000200026&lng=en&tlng=en</a>
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https://socictopen.socict.org/files/original/eacad1a274a039896f86327f18a42e2a.pdf
372f3c2b47e287d3ea815c9395de98fe
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The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Agricultura sostenible
Description
An account of the resource
Dominio científico: Agricultura sostenible
Text
A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.
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Title
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Los senderos productivos de la bioeconomía: El caso Honduras
Creator
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A. P. Colon-García, G. Catari-Yujra, E. Alvarado
Description
An account of the resource
El cambio climático afecta de forma negativa a los ecosistemas, medios de vida, y a la sociedad en general. Debido a esto, surgen alternativas como la bioeconomía que busca disminuir el impacto ambiental y cambio climático a través de sus principales senderos. De esta forma, el objetivo de la presente investigación fue evaluar la contribución del sector agrícola al Producto Interno Bruto (PIB) de Honduras y el potencial de desarrollo de la bioeconomía en el país. La investigación se llevó a cabo en Honduras, durante el año 2020 y el enfoque utilizado fue cualitativo; concretamente, la técnica utilizada fue una revisión de literatura sistemática. Los principales resultados muestran que durante el período entre los años 2015 y 2018 la contribución del sector agrícola se mantuvo en 14%, ocupando el tercer lugar después del sector de industria manufacturera y la intermediación financiera. Ahora bien, en relación a la bioeconomía fue posible establecer contribuciones puntuales en los siguientes senderos: a) Valoración de los recursos de la biodiversidad, b) Eco intensificación, c) Aplicaciones de biotecnología, d) Servicios eco sistémicos, e) Eficiencia de las cadenas de valor, y f) Biorefinería y bioproductos. Como conclusión se tiene que el tema de bioeconomía en Honduras se inclina hacia la biotecnología y la biorefinería. Aunque ambos senderos involucran tecnologías poco accesibles a pequeños productores agropecuarios. Por lo tanto, es primordial el diseño participativo de políticas y estrategias de bioeconomía para el sector de productos y servicios, lo que mejoraría la competitividad y desarrollo sostenible del país.
Date
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2021
Subject
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Cambio climático, bioeconomía, producto interno bruto, sector agrícola
Identifier
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10.5377/ribcc.v7i14.12820
Source
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Revista Iberoamericana de Bioeconomía y Cambio Climàtico
Publisher
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Universidad Nacional Autónoma de Nicaragua
Coverage
The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant
Economic theory. Demography, Meteorology. Climatology
Relation
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<a href="http://revistas.unanleon.edu.ni/index.php/REBICAMCLI/article/view/373" target="_blank" rel="noreferrer noopener">http://revistas.unanleon.edu.ni/index.php/REBICAMCLI/article/view/373</a>
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https://socictopen.socict.org/files/original/acc6fb25ab1e22261ee463545575a25f.pdf
c818599ded16a2bdd1b98dda64ec040b
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Title
A name given to the resource
Agricultura sostenible
Description
An account of the resource
Dominio científico: Agricultura sostenible
Text
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Title
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Composição florística e faunística de quintais agroflorestais da agricultura familiar no nordeste paraense
Creator
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A. P. Quaresma, R. H. C. Almeida, C. M. Oliveira, O. R. Kato
Description
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Os quintais agroflorestais são comuns entre os agricultores familiares da Amazônia, sendo sistemas de uso da terra sustentáveis desenvolvidos a partir dos saberes tradicionais. Além de ter como principal finalidade a promoção da segurança alimentar, são espaços de socialização e lazer para os agricultores e, podem contribuir para a composição de sua renda pela venda do excedente da produção. O objetivo desse trabalho foi identificar a diversidade dos quintais, a partir da composição de flora e fauna. A pesquisa estudou 37 quintais agroflorestais em cinco comunidades em Igarapé-Açu e Marapanim, nordeste paraense, usando técnicas de observação direta em campo, aplicação de questionários semiestruturados, notas etnográficas e turnê guiada nos quintais agroflorestais. Foram 107 espécies vegetais identificadas e 12 animais. Estes dados revelam que há uma quantidade maior de espécies comparativamente a outros estudos, o que se pode inferir grande conhecimento tradicional empregado na constituição e diversificação desses sistemas de uso da terra no local de estudo, considerando, o baixo nível tecnológico e força de trabalho familiar empregados. Assim, esses espaços característicos das paisagens rurais dos agricultores familiares do nordeste paraense correspondem elementos fundamentais dos seus agroecossistemas, gerando produção e garantindo a reprodução das famílias.Floristic and faunal composition homegardens of family farming in northeast ParáAbstract: The homegardens are common among family farmers in the Amazon, and sustainable land use systems developed from traditional knowledge. Besides having as main purpose the promotion of food security, they are spaces for socialization and recreation for farmers and can contribute to the composition of its income from the sale of production surplus. The aim of this study was to identify the diversity of yards from the flora and fauna composition. The research studied 37 homegardens in five communities in Igarapé-Açu and Marapanim, northeast Pará, using direct observation techniques in the field, application of semi-structured questionnaires, ethnographic notes and guided tour in homegardens. Were identified 107 plant species and 12 animals. These data show that there is a greater number of species compared to other studies, which can be inferred large traditional knowledge used in the creation and diversification of these land use systems in the study site, considering the low technological level and family labor employees. Thus, these characteristic spaces of the countryside of family farmers in northeast Pará match key elements of their agricultural ecosystems, generating production and ensuring the reproduction of families.
Date
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2015
Subject
The topic of the resource
desenvolvimento comunitário, reprodução socioeconômica, sistemas agroflorestais
Identifier
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10.18378/rvads.v10i5.3706
Source
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Revista Verde de Agroecologia e Desenvolvimento Sustentável
Publisher
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Grupo Verde de Agroecologia e Abelhas (GVAA)
Coverage
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Agriculture (General), Geography. Anthropology. Recreation, Environmental sciences
Relation
A related resource
<a href="http://www.gvaa.com.br/revista/index.php/RVADS/article/view/3706" target="_blank" rel="noreferrer noopener">http://www.gvaa.com.br/revista/index.php/RVADS/article/view/3706</a>
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https://socictopen.socict.org/files/original/a06ece0e1948b3c5b2cddf2043e0ff21.pdf
17b5f0c27ebc7526f2ee68210542d83d
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Agricultura sostenible
Description
An account of the resource
Dominio científico: Agricultura sostenible
Text
A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.
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Title
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Análisis espacio temporal y climático del humedal altoandino de Chalhuanca (Perú) durante el periodo 1986-2016
Creator
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A. Pauca-Tanco, C. Ramos-Mamani, C. R. Luque-Fernández, C. Talavera-Delgado, J. F. Villasante-Benavides, J. P. Quispe-Turpo, L. Villegas-Paredes
Description
An account of the resource
Los humedales altoandinos son considerados ecosistemas frágiles que proporcionan servicios ecosistémicos para el mantenimiento de la biodiversidad y economía andina, sin embargo, actualmente la amenaza global del cambio climático los pone en grave riesgo, es por ello que el objetivo de este estudio es determinar la variación espacio temporal y climática del humedal altoandino de Chalhuanca (Perú), durante el periodo 1986-2016. Se obtuvieron escenas Landsat de la temporada seca de los años 1986, 1991, 1996, 2001, 2006, 2011, 2016 y mediante técnicas de teledetección se calculó el área y el índice de vegetación (NDVI) de los humedales. Para la precipitación, temperatura máxima y temperatura mínima, se realizó un análisis de medias móviles, tendencias lineales y se aplicó la prueba estadística no paramétrica de Mann-Kendall, finalmente mediante correlación y regresión se evaluó la interacción entre las variables. Los resultados muestran que el área de humedal se ha incrementado en razón de 12 ha/año. En cuanto al NDVI, se ha detectado un incremento de los valores promedio para el periodo evaluado, siendo 0,26 el umbral (promedio de valores mínimos). El análisis de los datos climáticos muestra que la precipitación, temperatura máxima y mínima se han incrementado en 32 mm/dec, 0,3 °C/dec y 0,6 °C/dec respectivamente, siendo significativos (α
Date
A point or period of time associated with an event in the lifecycle of the resource
2020
Subject
The topic of the resource
Cambio climático, Landsat, Servicios ecosistémicos, calentamiento global, teledetección
Identifier
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10.4995/raet.2020.13325
Source
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Revista de Teledetección
Publisher
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Universitat Politécnica de Valencia
Coverage
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Geography (General)
Relation
A related resource
<a href="https://polipapers.upv.es/index.php/raet/article/view/13325" target="_blank" rel="noreferrer noopener">https://polipapers.upv.es/index.php/raet/article/view/13325</a>
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https://socictopen.socict.org/files/original/0f202e5b1105fbf0540753b59baf5941.pdf
ce5613025753473c37834afafb2e2864
Dublin Core
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Title
A name given to the resource
Agricultura sostenible
Description
An account of the resource
Dominio científico: Agricultura sostenible
Text
A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.
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Title
A name given to the resource
Predicción del estado nutricional mediante variables antropométricas y de seguridad alimentaria en el hogar de un grupo de embarazadas de Caracas, Venezuela Prediction of the nutritional status by anthropometrical variables and food safety at homes of pregnant women from Caracas, Venezuela
Creator
An entity primarily responsible for making the resource
A. Pérez Guillén, J. Bernal Rivas
Description
An account of the resource
Objetivo: Evaluar el estado nutricional y el nivel de Seguridad Alimentaria en el Hogar de una muestra de embarazadas aparentemente sanas en la Maternidad Concepción Palacios de Caracas, Venezuela e identificar las variables que pudieran predecir el edo. Nutricional del grupo de embarazadas evaluadas. Métodos: La investigación fue transversal, descriptiva y comparativa. Se seleccionó 89 embarazadas entre los 14 y 44 años de edad de la consulta externa prenatal. Se midieron variables económicas, sociales, demográficas y alimentario-nutricionales, entre las que destacan el nivel de Seguridad Alimentaria en el Hogar y variables antropométricas como peso, talla y circunferencia media de brazo que permitieron construir indicadores para evaluarel estado nutricional materno. Se realizó análisis estadístico descriptivo, bivariado y de regresión múltiple, con el programa SPSS, versión 12. Resultados: Las variables que predicen el estado nutricional actual de la muestra de embarazadas fueron circunferencia media de brazo derecho, nivel de seguridad alimentaría en el hogar y suplementación con vitaminas y/o minerales. Estas variables predicen el 78,2% de la variación del estado nutricional actual en esta muestra. Este estudio permitio reconocer la importancia del uso de variables sencillas, para ser utilizadas por personal levemente capacitado y predecir el estado nutricionalde las embarazadas, lo que contribuye a conocer riesgos alimentario-nutricionales. Conclusiones: Se recomienda profundizar en el estudio de métodos que evalúen la alimentación y nutrición de manera práctica y fácil, aplicables por personal no técnico, además de continuar el proceso de validación de la combinación de las variables determinadas como predictores del estado nutricional materno.Objective: The objective of this research is to analyze the nutritional status and household food security of asample of healthy pregnant women who attend to external medicine service at Concepcion Palacios Maternity located in Caracas, Venezuela, and identify variables, which could predict the nutritional status of the evaluated group. Method: This cross sectional, descriptive, comparative study evaluates a sample of 89 pregnant women, between 14 and 44 years of age. Economical, social, demographic and alimentary consumption variables and nutritional conditions were studied. On the way, anthropometrics likeweight, height, and middle-arm circumference and Household food security scale were obtained. In order to perform the descriptive statistic, bivariate, and multiple linear regression analysis required during the investigation, the software SPSS, version 12, was used. Results: The predictive variables considered for the evaluation of the actual nutritional status in pregnant women were: right middle-arm circumference, household food security level and the supplementation with vitamins and/or minerals. These variables explain 78,2% of the actual nutritional status variation in this sample. Therefore, this investigation highlights the importance of the research on simple variables, as a good prediction of the actual nutritional status in pregnant women, with acceptable precision values and without requiring hightrained personnel to perform it. Under these findings, is ery important the study of more predictive variables to evaluate the nutritional and alimentary conditions, with practical and easy mechanisms that can be applied by non-technical personnel. Conclusion: It is recommended to go deep into the study of methods, which evaluate the nutrition in an easy and practical way, applied by non-technical personnel, besides continuing the validation process of the variable combinations determined as predictive of the nutritional status.
Date
A point or period of time associated with an event in the lifecycle of the resource
2006
Subject
The topic of the resource
Actual nutritional state, Anthropometrics, Antropometria, Household Food Security, Seguridad Alimentaria en el Hogar, Venezuela, embarazadas, estado nutricional, pregnant
Source
A related resource from which the described resource is derived
Nutrición Hospitalaria
Publisher
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Arán Ediciones, S. L.
Coverage
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Nutritional diseases. Deficiency diseases
Relation
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<a href="http://scielo.isciii.es/scielo.php?script=sci_arttext&pid=S0212-16112006000800008" target="_blank" rel="noreferrer noopener">http://scielo.isciii.es/scielo.php?script=sci_arttext&pid=S0212-16112006000800008</a>
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https://socictopen.socict.org/files/original/666d743f63aa8ea7dcb48a420aac332c.pdf
55dbaeff5d6b4a6e84c076e64c45ab4e
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Agricultura sostenible
Description
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Dominio científico: Agricultura sostenible
Text
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Sobre la distribució de Trifolium diffusum Ehrh. als Països Catalans
Creator
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A. Pérez-Haase, E. Batriu, A. Mercadé, J. M. Blanco-Moreno
Description
An account of the resource
[es ] En esta nota a portamos nuevos datos sobre la distribución de Trifolium diffusum Ehrh. en los Países Catalanes y confirmamos su presencia en Cataluña.[ct] En aquesta nota aportem noves dades corològiques de Trifolium diffusum Ehrh. als Països Catalans i confirmem la seva presència a Catalunya.
Date
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2009
Subject
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Cataluña, Nuevas localidades, ecología, trifolium diffusum
Identifier
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10.3989/collectbot.2009.v28.34
Source
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Collectanea Botanica
Publisher
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Consejo Superior de Investigaciones Científicas
Coverage
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Biology (General), Botany
Relation
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<a href="http://collectaneabotanica.revistas.csic.es/index.php/collectaneabotanica/article/view/34" target="_blank" rel="noreferrer noopener">http://collectaneabotanica.revistas.csic.es/index.php/collectaneabotanica/article/view/34</a>
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https://socictopen.socict.org/files/original/f3426c4eaf4d4c8745e38d09fbfe1b6a.pdf
77d090f491de18b9d8fda92ddffdc5d2
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Agricultura sostenible
Description
An account of the resource
Dominio científico: Agricultura sostenible
Text
A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Interacciones bióticas en lagos Antárticos. Investigaciones derivadas del proyecto LIMNOPOLAR en la Península Byers (Antártida marítima)
Creator
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A. Quesada, C. Rochera, J.A. Villaescusa, M.E. Díazmacip, J.A. Gil-Delgado, M. Toro, E. Rico, D. Velázquez, A. Camacho
Description
An account of the resource
La estructura trófica de las comunidades planctónicas de los lagos antárticos se caracteriza por su sencillez, estando funcionalmente dominada por microorganismos. En estas cadenas tróficas el zooplancton, cuando está presente, ocupa generalmente la posición de consumidores superiores. Estos sistemas constituyen un marco muy adecuado en el que evaluar ciertos aspectos de la ecología trófica y funcional. Nuestro propósito ha sido valorar la aplicabilidad de una serie de teorías ecológicas, relativas a las relaciones tróficas, al flujo de energía y a la relativa importancia de los factores tanto abióticos como bióticos como elementos que expliquen el funcionamiento de estos ecosistemas en zonas polares sometidas a un fuerte control físico. Estudios experimentales llevados a cabo en lagos de la Península Byers (Isla Livingston) por nuestro grupo de investigación han puesto de manifiesto como determinadas interacciones bióticas, como la depredación, podrían ejercer este efecto estructurador, a pesar del fuerte control físico que supuestamente aleja a estas comunidades del equilibrio. De nuestros resultados se deriva la existencia de cascadas tróficas en el plancton con potencialidad de extenderse en el bucle microbiano. Especialmente relevantes resultan aquellas interacciones derivadas de la actividad del zooplancton. En particular, la presencia de éstos parece inducir un incremento en las densidades de las poblaciones del picoplancton vía disminución de los organismos bacterívoros. De nuestras investigaciones se deriva también la capacidad de este zooplancton para acelerar el reciclado de nutrientes, la cual debe contribuir en parte a sostener la productividad del sistema. Estas observaciones han permitido bosquejar un modelo conceptual del funcionamiento de la red trófica pelágica. El aumento progresivo de las temperaturas en áreas polares podría acrecentar las entradas de energía y activar el ciclo de nutrientes, siendo una de las posibles consecuencias, la intensificación de este tipo de interacciones biológicas.
Date
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2011
Source
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Ecosistemas
Publisher
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Asociación Española de Ecología Terrestre
Coverage
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Environmental sciences
Relation
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<a href="http://www.redalyc.org/articulo.oa?id=54021285005" target="_blank" rel="noreferrer noopener">http://www.redalyc.org/articulo.oa?id=54021285005</a>