Consulta: subjectFacets:"Depth"
Registros recuperados: 22
Data/hora: 11/06/2024 00:36:52

Desarrollo del sector microfinanciero en México.
Provedor de dados: 32
Autores: Álvarez González, Evelina.
El propósito de este trabajo fue analizar el desarrollo y desempeño  del sector microfinanciero en México durante el periodo de 1996-2012, mediante los indicadores profundidad y amplitud con el objetivo de conocer sobre que niveles de pobreza están realmente incidiendo las instituciones de microfinanzas en nuestro país y como se está comportando el  mercado de prestatarios. El estudio se realizó con una muestra correspondiente a 120 IMF´S (Instituciones de Microfinanzas) mexicanas registradas y disponibles en las bases de datos de Microfinance Information Exchange, Inc. (Mix). y ProDesarrollo, Finanzas y Microempresa A.C. (Benchmarking 2012), para lo cual se empleo una metodología de tipo cuantitativa analítica con  grupos de control y de estudio para...
Palavras-chave: Microfinanzas; Profundidad; Amplitud; Pobreza; Microfinance; Depth; Breadth; Poverty; Economía; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/2173

Methodological differences can affect sequencing depth with a possible impact on the accuracy of genetic diagnosis
Provedor de dados: 74
Autores: Borges,Murilo G.; Rocha,Cristiane S.; Carvalho,Benilton S.; Lopes-Cendes,Iscia.
Abstract For a better interpretation of variants, evidence-based databases, such as ClinVar, compile data on the presumed relationships between variants and phenotypes. In this study, we aimed to analyze the pattern of sequencing depth in variants from whole-exome sequencing data in the 1000 Genomes project phase 3, focusing on the variants present in the ClinVar database that were predicted to affect protein-coding regions. We demonstrate that the distribution of the sequencing depth varies across different sequencing centers (pair-wise comparison, p &lt; 0.001). Most importantly, we found that the distribution pattern of sequencing depth is specific to each facility, making it possible to correctly assign 96.9% of the samples to their sequencing center....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Whole exome sequencing; Depth; ClinVar; Computational biology; Clinical genomics.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000400804

Влияние глубины произрастания на строение листа морской травы Zostera marina L.
Provedor de dados: 13
Autores: Киреева, Е. В.
Изучены особенности анатомического строения листа морской травы Zostera marina L. -эпидермиса, кутикулы, хлоренхимы, механических тканей, воздушных полостей. Наибольшие анатомо-метрические параметры зостеры зарегистрированы на глубине от 5 до 8 м. Предложено использовать объем воздушных полостей листа зостеры в качестве индикатора глубины произрастания вида.
Tipo: Journal Contribution
Palavras-chave: Анатомическая структура; Глубина произрастания; Depth; Anatomical structure Depth Anatomical structures Depth http://aims.fao.org/aos/agrovoc/c_2190.
Ano: 2002
URL: http://repository.ibss.org.ua/dspace/handle/99011/389

Distribuição de raízes do maracujazeiro amarelo em função de níveis e métodos de irrigação.
Provedor de dados: 14
Autores: AZEVEDO, J. A. de; SILVA, H. C.; ANDRADE, L. R. M.; JUNQUEIRA, N. T. V.
bitstream/CPAC-2009/25316/1/p2004_36.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Gotejamento; Trickle irrigation.; Aspersão; Maracujá; Irrigação; Passiflora Edulis; Profundidade; Raiz; Sistema Radicular.; Depth; Irrigation; Passion fruits; Root systems; Sprinkler irrigation.; Roots.
Ano: 2005
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568318

Crustacés profonds capturés aux casiers aux Antilles Françaises
Provedor de dados: 5
Autores: Paulmier, Gerard.
For several years the fishermen of the West Indies have directed their activities towards new fishing grounds, notably the bathyales zones adjacent to island plateaux up to approximately 1000 metres in depth. Explorations earned out since 1989 have shown that diverse crustacean populations could be exploited. However, populations and exploitable stocks arc not well known. The use of crustaceans traps as a fishing technique permits the capture of shellfish, shrimps and prawns of which at least six species could have commercial interest. The main objective of this work is do draw up an inventory of the principal commercial species as well as the accompanying species belonging to the subordres Decapoda macrura, anomura, brachyura, and to the orders Isopoda...
Tipo: Text
Palavras-chave: Crabes; Langoustines; Crevettes; Profond; Crustacés; Inventaire; Antilles françaises; Crabs; Prawns; Shrimps; Depth; Crustaceas; Inventory; French Antillean.
Ano: 1993
URL: https://archimer.ifremer.fr/doc/1993/rapport-992.pdf

Peches experimentales des crustaces profonds dans les eaux de la martinique ( pandalidae, nephropidae ). Prospections, rendements et biologie des especes.
Provedor de dados: 5
Autores: Paulmier, Gerard; Gervain, Paul.
The principal objective of the work carried out in the deep waters adjoining the island shelf around Martinique between July 1991 and april 1992 was to establish an initial inventory of potentially exploitable deep benthic resources.The cylindrical lobster pot used during fishing experiments allowed the catch of a varied carcinological marine organisms of which six species at least have economic interest : 5 species of shrimp all belonging to the sub-order of Caridea of the Pandalidae family : Plesionika edwardsi, P. (macropoda) polyacanthomerus, P.laevis, Heterocarpus ensifer and H.laevigatus, and one species of prawn of the Nephropidae family : Eunephrops cadenasi. The yields, compared to those of commercial fishermen, were medium or good for Plesionika...
Tipo: Text
Palavras-chave: Depth; Biology; Fishinf; Prawn; Shrimp; Crustaceas; Martinique; Profond; Biologie; Pêche; Langoustine; Crevette; Crustace; Martinique.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/1994/rapport-1540.pdf

New insights into behavioural ecology of European seabass off the West Coast of France: implications at local and population scales
Provedor de dados: 5
Autores: De Pontual, Helene; Lalire, Maxime; Fablet, Ronan; Laspougeas, Claire; Garren, Francois; Martin, Stephane; Drogou, Mickael; Woillez, Mathieu.
From 2010 to 2012, 246 data storage tags were deployed on European seabass in the Iroise Natural Marine Park, a marine protected area (MPA) off west Brittany, France. A return rate of 14.6% associated with long time series of data provided new information on fish ecology (e.g. maximum experienced depth greater than 225 m, temperature range 6.80–21.87°C). Depth and temperature series were used to infer individual migration using an innovative hidden Markov model (HMM) especially developed for seabass geolocation. Reconstructed fish tracks revealed that seabass is a partially migratory species, as individuals exhibited either long-distance migrations towards the Bay of Biscay or the Celtic Sea, or residency behaviour in the Iroise Sea. Fidelity to summer...
Tipo: Text
Palavras-chave: Cod; Connectivity; Data Storage Tag (DST); Depth; European sea bass; Dicentrarchus labrax; Geolocation; Partial migration; Spawning site fidelity; Temperature; Vertical movement.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00451/56230/57790.pdf

Environmentally Driven Color Variation in the Pearl Oyster Pinctada margaritifera var. cumingii (Linnaeus, 1758) Is Associated With Differential Methylation of CpGs in Pigment- and Biomineralization-Related Genes
Provedor de dados: 5
Autores: Stenger, Pierre-louis; Ky, Chin-long; Reisser, Celine; Cosseau, Céline; Grunau, Christoph; Mege, Mickael; Planes, Serge; Vidal-dupiol, Jeremie.
Today, it is common knowledge that environmental factors can change the color of many animals. Studies have shown that the molecular mechanisms underlying such modifications could involve epigenetic factors. Since 2013, the pearl oyster Pinctada margaritifera var. cumingii has become a biological model for questions on color expression and variation in Mollusca. A previous study reported color plasticity in response to water depth variation, specifically a general darkening of the nacre color at greater depth. However, the molecular mechanisms behind this plasticity are still unknown. In this paper, we investigate the possible implication of epigenetic factors controlling shell color variation through a depth variation experiment associated with a DNA...
Tipo: Text
Palavras-chave: Pearl oyster; Environmental pressure; Depth; Color change; Pigmentation; DNA methylation; Methylome characterization.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00685/79667/82436.pdf

Crustaces profonds captures aux casiers aux Antilles françaises - 1996
Provedor de dados: 5
Autores: Paulmier, Gerard.
For several years the fishermen of the West Indies have directed their activities towards new fishing grounds, notably the bathyales zones adjacent to island plateaux up to approximately 1000 metres in depth. Explorations carried out since 1989 have shown that diverse crustacean populations could be exploited. However, populations and exploitable stocks are not well known. The use of crustaceans traps as a fishing technique permits the capture of shellfish, shrimps and prawns of which at least six species could have commercial interest. The main objective of this work is do draw up an inventory of the principal commercial species as well as the accompanying species belonging to the subordres Decapoda macrura, anomura, brachyura and to the orders Isopoda...
Tipo: Text
Palavras-chave: Crab; Prawn; Shrimp; Depth; Crustaceas; Inventory; French Antillean; Crabe; Langoustine; Crevette; Profond; Crustace; Inventaire; Antilles françaises.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/1996/rapport-1543.pdf

Mercury in organisms from the Northwestern Mediterranean slope: Importance of food sources
Provedor de dados: 5
Autores: Cresson, Pierre; Fabri, Marie-claire; Bouchoucha, Marc; Brach-papa, Christophe; Chavanon, Fabienne; Jadaud, Angelique; Knoery, Joel; Marco-miralles, Francoise; Cossa, D.
Mercury (Hg) is a global threat for marine ecosystems, especially within the Mediterranean Sea. The concern is higher for deep-sea organisms, as the Hg concentration in their tissues is commonly high. To assess the influence of food supply at two trophic levels, total Hg concentrations and carbon and nitrogen stable isotope ratios were determined in 7 species (4 teleosts, 2 sharks, and 1 crustacean) sampled on the upper part of the continental slope of the Gulf of Lions (Northwestern Mediterranean Sea), at depths between 284 and 816 m. Mean Hg concentrations ranged from 1.30 ± 0.61 to 7.13 ± 7.09 μg g− 1 dry mass, with maximum values observed for small-spotted catshark Scyliorhinus canicula. For all species except blue whiting Micromesistius poutassou, Hg...
Tipo: Text
Palavras-chave: Continental slope; Trophic webs; Depth; Teleosts; Sharks; Stable isotopes.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00206/31759/30693.pdf

Size composition, monthly condition factor and morphometrics for fishery-dependent samples of Rioraja agassizi (Chondrichthyes: Rajidae), off Santos, Southeast Brazil
Provedor de dados: 83
Autores: Oddone,M. Cristina; Amorim,Alberto F. de; Mancini,Patrícia L.; Norbis,Walter.
Specimens of Rioraja agassizi were collected monthly off Santos, Southeast Brazil, between latitudes 23º37'S and 27º40'S, from March, 2005 to March, 2006. A total number of 278 males and 1023 females were captured. Observed depth range was 10-120 m, being the species absent above 120 m. Sex ratio significantly favored females. The entire length range of R. agassizi was observed. Females ranged in length from 16.0 to 59.4 cm and males from 13.0 to 47.2 cm. Mean female length was significantly higher than that of males. For grouped length distributions, asymmetry patterns were observed in both sexes. Length-width functions were sexually dimorphic. Males with lengths &lt; 24.5 cm were relatively wider than females. Length-total weight curves were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Skates; Depth; Total length; Elasmobranch; Sex ratio.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000300021

Development of habitat suitability criteria for Neotropical stream fishes and an assessment of their transferability to streams with different conservation status
Provedor de dados: 83
Autores: Teresa,Fabrício Barreto; Casatti,Lilian.
We assessed the preference of 10 fish species for depth and velocity conditions in forested streams from southeastern Brazil using habitat suitability criteria (HSC curves). We also tested whether preference patterns observed in forested streams can be transferred to deforested streams. We used data from fish sampled in 62 five-meter sites in three forested streams to construct preference curves. Astyanax altiparanae, A. fasciatus, Knodus moenkhausii, and Piabina argentea showed a preference for deep slow habitats, whereas Aspidoras fuscoguttatus, Characidium zebra, Cetopsorhamdia iheringi, Pseudopimelodus pulcher, and Hypostomus nigromaculatus showed an opposite pattern: preference for shallow fast habitats. Hypostomus ancistroides showed a multimodal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Depth; Fish assemblages; Habitat preference; Riparian forest; Velocity.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000200395

La malacofauna de la zona costera de Santa Marta y Parque Nacional Natural Tayrona, Caribe colombiano
Provedor de dados: 20
Autores: Díaz, Juan M.
Con base en colectas intensivas y en la bibliografía existente se hizo un listado de las especies de moluscos conocidas de la región de Santa Marta y Parque Nacional Natural Tayrona con anotaciones sobre sus preferencias de sustrato y rango de profundidad. De un total de 727 especies, 485 son gastrópodos, 214 bivalvos, 13 poliplacóforos, 10 escafópodos y 5 cefalópodos. La mayor cantidad de especies se encuentra en fondos de arena con fanerógamas marinas y de rocas sueltas (cantos, bloques) en aguas someras. La gran cantidad de especies en esta región se explica por la concentración de variados biotopos y rangos de profundidad en áreas reducidas y por factores histórico-biogeográficos particulares de esta región.
Tipo: Journal Contribution
Palavras-chave: Depth; Malacology; Ecology; Habitat; Condition factor; Substrate preferences; Malacology; Ecology; Http://aims.fao.org/aos/agrovoc/c_4528; Http://aims.fao.org/aos/agrovoc/c_2467.
Ano: 1994
URL: http://hdl.handle.net/1834/3759

Distribución de la megafauna bentónica del Caribe colombiano asociada a variables ambientales del fondo marino
Provedor de dados: 20
Autores: Vides Casado, M. P.
El presente análisis relaciona la distribución espacial de especies de la megafauna bentónica con gradientes de variables ambientales estimadas cerca al fondo oceánico, haciendo uso de datos obtenidos a lo largo de la provincia del mar Caribe colombiano. Los datos utilizados corresponden a muestras de megafauna bentónica obtenidas en 96 sitios de colecta entre los años 1999 y 2008 en un ámbito de profundidad entre 15 y 900 m. La distribución latitudinal de los taxa mayores se analizó a través de perfiles del fondo de 100 km de longitud desde la línea de costa. Se utilizaron curvas de acumulación de especies con intervalos de confianza de 95 % para hacer las comparaciones. La distribución de la megafauna bentónica se relacionó con los parámetros ambientales...
Tipo: Journal Contribution
Palavras-chave: Benthos; Assemblages; Depth.
Ano: 2011
URL: http://hdl.handle.net/1834/4400

Root distribution according to phenology in plantain cultivars (Musa AAB), Ecuador
Provedor de dados: 94
Autores: Avellán-Vásquez,Leonardo Enrique; Estévez-Chica,Sandra Tatiana; Vaca-Sotelo,Diego Alfonso; Zambrano-Mendoza,Myriam Elizabeth; Cedeño-Loor,Tito Alexander; Sánchez-Urdaneta,Adriana Beatriz.
Abstract  Plantain is the fourth most important crop in the world, considered as a basic and export product in Ecuador. The root distribution of three plantain cultivars (Musa AAB) grown in Ecuador was evaluated at the “Río Suma” Experimental Farm, “Laica Eloy Alfaro de Manabí” University, 0º15’ S, 79º26’ W. Plantain cultivars were ‘Barraganete’, ‘Curare Enano’ and ‘Dominico Hartón’, and root distribution was determined according to the phenology of plants (10, 20, 30, 40 leaves (inflorescence) and harvest), seeded at 2.5 m x 1.8 m. In a completely randomized block design with five replicates, five plants·cultivar-1 were selected for each evaluation. Root distribution was carried out in soil profiles between rows. The greatest root distribution occurred 20...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa sp.; Root development; Phenology; Depth; Number of roots.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452021000200203

Evaluation of innovative cultivation methods, on potato Burren cultivar
Provedor de dados: 111
Autores: Alwan, salih kadhim.
The study aimed to identify the effect of cultivation machine on potato Burren variety, specification under CMBGR  and CMBRO at different distances and ranges of cultivation depths .Two types of potato cultivation  methods (CMBGR and CMBRO) were tested under two cultivation distances(25 and 30 cm) and three levels of cultivation depths (8, 10 and 12 cm). The experiments were conducted in a factorial experiment under a randomized complete block design with three replications ,The CMBGR was significantly better than CMBRO in all studied parameters .For CMBGR the fuel consumption, machine productivity,machine efficiency, germination percentage ,root density and distributed in soil for vegetative growth stage , root density and distributed in soil for tubers...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Potato; Tractor (type New Holland–TD80); Cultivation distances  machine(type Adwhit  ); Mechanical properties; Depth.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6415

Specific draft modeling for combined and simple tillage implements using mathematical, regression and ANN modeling in silty clay loam soil
Provedor de dados: 111
Autores: zaki, hassan; khorasani, Mohammad Esmail; aghili nategh, nahid; Sheikhdavoodi, Mohammad; andekaiezadeh, Korosh.
Specific draft is one of the important parameters in the design of tillage tools and estimation of energy consumption in tillage operations, which makes it useful. For this reason, it’s prediction and modeling about different working conditions (depth of plowing and advance velocity) provide the possibility to determine the proper working conditions of tillage implements. In this study, two groups of tillage implements with different geometry including combined tillage implements (combined tiller and chisel packer) and simple tillage implements (moldboard plow, disk plow, chisel plow and offset disk harrow) are used. Also 3 speeds (3, 4.5 and 6 km / h) and 3 different depths (15, 20 and 25 cm) in silty clay loamy soil (47% silt, 22% sand and 31% clay) with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Specific Draft; Tillage tools; Regression; ANN; Depth; Forward speed.
Ano: 2022
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6433

Evaluation of corn planter under travel speed, working depth, pressure wheel and cone index
Provedor de dados: 111
Autores: Khodaei, Mehdi.
Compaction is one of the restricting factors in desirable seed germination and root growth. As a sign for soil compaction can be a criterion for optimal seed germination. Seeds require some compression of the surrounding soil at planting for optimum growth, which it is made by pressure wheels in planters. Travel speed and working depth affect the soil cone index. A field experiments were conducted to evaluate the effects of the speed and working depth in the beginning of the autumn season. Experiments were performed in the form of factorial split-plot based on a randomized complete block design with two factors, the travel speed (3, 4, and 6 km/h) and working depth (3, 6, 9, 12 and 15 cm) in three replication. Digital cone Penetrometer was used for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Cone index; Corn planter; Depth; Moving speed; Pressure wheel.
Ano: 2015
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3364

Relationship between environmental variables and growth of Pteria colymbus (Mollusca Bivalvia: Pteriidae), at three cultivation depths
Provedor de dados: 50
Autores: Freites,Luis Felipe; Guevara,Miguel; Márquez,Adrián; Revilla,Jormil; Narváez,Mariela; Lodeiros,César.
ABSTRACT We studied the influence of environmental variables associated with three water depths (2, 6 and 10 m) on shell growth, soft tissues dry mass (STDM) and survival of the Caribbean winged oyster Pteria colymbus (Roding, 1798). chlorophyll-a (Chl-a), dissolved oxygen, particulate organic matter (POM) and temperature were studied at each depth. Oysters were placed in 135 plastic baskets with five individuals in each basket. Three baskets at each depth were chosen at monthly intervals for measurements of biometric parameters, biofouling, and survival. At the end of the study, dry mass of the individuals grown at 10 m was significantly lower (Kruskal-Wallis non-parametric test KW, P &lt; 0.05) with the highest values of STDM corresponding to oysters...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biofouling; Environment; Depth; Oyster; Survival.
Ano: 2020
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612020000100009

Evaluation of the community structure of marine sponges in reef patches of the southern Caribbean, Costa Rica
Provedor de dados: 50
Autores: Araya-Vargas,Alexander; Busutil,Linnet; García-Rojas,Andrea; Pereira-Chaves,José Miguel; Piedra-Castro,Liliana.
ABSTRACT Marine sponges fulfill many critical functions to coral reefs. In turn, variations in the community structure of the poriferans may indicate changes in the environmental conditions of the ecosystems where they live. However, their study has been scarce in the Caribbean of Costa Rica, mainly in the ecological field. Therefore, the community structure of these organisms was evaluated in four reef patches (Perezoso, Pequeño, Coral Garden, and the 0.36) and it was determined whether it could be explained by sedimentation, substrate, and depth. Relative abundance (RA) and relative coverage (RC) for each species, sponge density, and diversity indices (species richness, Shannon heterogeneity, Pielou's evenness, and Simpson's dominance) were calculated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porifera; Coral reef; Sedimentation; Substrate; Depth.
Ano: 2020
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612020000100039

Contributions to the knowledge of macroalgae of the Gerlache Strait - Antarctica
Provedor de dados: 50
Autores: Rincón-Díaz,Natalia; Macaya,Erasmo; Guzmán-Henao3,Sara E.
ABSTRACT This research is a contribution to the knowledge of some marine macroalgae species collected during the “Admiral Padilla” (2016-2017) and “Admiral Campos” (2018-2019) scientific expeditions, in which the Marine and Coastal Research Institute-Invemar participated with the project “Biodiversity and Oceanographic Conditions of the Gerlache Strait-Biogerlache-Antartica”. Samples were taken using a Shipek dredge; and underwater video recordings were made with a ROV (Remote Operated Vehicle). Six (6) species were identified: four (4) Rhodophyta and two (2) Ochrophyta-Phaeophyceae. Depth and zonation information where the macroalgae were found is included, and their relationship with previous records for the study area.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodophyta; Phaeophyceae; Depth; Polar benthic macroalgae.
Ano: 2021
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000300213

Germination, viability and longevity of horseweed (Conyza spp.) seeds as a function of temperature and evaluation periods
Provedor de dados: 65
Autores: Agostinetto,Dirceu; Vargas,Andrés Antonio Monge; Ruchel,Queli; Silva,Jéssica Dias Gomes da; Vargas,Leandro.
ABSTRACT:  In Brazil, horseweed is one of the most important weeds because of the resistance to herbicides and high competitive for the crops. A large of losses were reported in major crops such as soybeans, wheat and corn, where the use a no-tillage system and the herbicide resistance promote better establishment. A correct understanding of the way temperature influences germination enables the prediction of the regions with the highest potential for colonization by this weed and thus facilitates its control. The objective of this study; therefore, was to discern the ways temperature affected the germination, viability and longevity of horseweed seeds. Testing was done at 10, 20 and 30°C, while evaluation occurred on days 0, 15, 30, 45 and 60. Seeds were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Secondary dormancy; Depth; Management; Seed quality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000900202