Vol. 8 No. 23 (2019)

View Vol. 8 No. 23 (2019)

Published: 2020-01-13

EDITORIAL

Editorial

Xiomara Valverde Hernández

4

SCIENTIFIC ARTICLES

Structure mistakes in the adjective subordinate sentence when writing the argumentative essay

Álvaro Escobar Soriano, Armando José Sandoval

6-26
Operation of working memory in users of senior centers

Dustin Ezequiel Amador Jiménez, María Elena Lara Sánchez, Ligia Walkiria Ortiz Gonzales

27-36
Learning styles and attitudes towards Mathematics in students at POLISAL, UNAN-Managua

Jony Alexander Rojas Rojas

37-47
Identification and quantification of pesticide residues in vegetables of high consumption commercialized in markets and supermarkets in Managua

Josseth Mhartin Díaz Domínguez

48-57
Natural contamination by arsenic in the groundwater of the rural community "La Fuente", to suggest and promote the use of alternative sources of safe water, municipality La Paz Centro, León, Nicaragua

Maximina Altamirano, Valeria Delgado

58-72
Removal of hexavalent chromium in contaminated water using banana peel (Paradisiac musea) as adsorbent

Maybis López Hernández, Martha Lacayo Romero

73-83

PROGRESS REPORT

Requirement analysis and management information system development of the available varieties of georeferenced basic grains, in the Department of Carazo (SIGITEC), in the period 2007-2015

Álvaro Antonio Mejía Quiroz

84-101