scholarly journals Interpretaciones sobre la lluvia de polen en la región de San Luis Potosí, México

2017 ◽  
pp. 53 ◽  
Author(s):  
Socorro Lozano-García

In a region located mainly in the State of San Luis Potosí, México, floristic and soil samples were taken, in order to obtain palynological spectra. The comparison between the floristic results and the palynological spectra corresponding to eight types of vegetation, shows that there are taxa such as Pinus and Quercus with a high pollen representation (RP) in most of the spectra. There were some, such as the grasses that exhibited a normal RP. Also, low values of RP were detected in some taxa typical of sucrubland. A cluster analysis was applied to forty-seven soil samples and yielded a clear separation between a) oak forest and chaparral, and b) other vegetation types.

2007 ◽  
Vol 23 (3) ◽  
Author(s):  
Miguel Vasquez-Bolaños

First record of the fungus-wronging ant Mycocepurus smithii for the state of San Luis Potosí and new record locality for Jalisco state, amplying north limit for this species.


2018 ◽  
Vol 14 (26) ◽  
pp. 232
Author(s):  
Pablo Martínez González ◽  
Hugo Jesús Ochoa Hernández ◽  
Mario Eduardo Ibarra Cortés

This paper focuses, first, on presenting a tool designed as a methodological proposal to help the municipal administrations to improve their administrative processes. This is possible by taking into consideration the phases that integrates it (Planning, Organization, Integration, Direction and Control) in order to identify the steps of the process where there are failures. This, however, makes it possible to detect them, apply corrective measures, and ensure that they are able to carry out processes of continuous improvement. Secondly, the document presents a study in which a methodology was applied. Here, it could be documented that for the case of the municipalities of Tamasopo, Tamuín and Ciudad Valles in the State of San Luis Potosí, a lack of systematization was detected in the administrative processes. The results have allowed us to perceive a differentiated opinion between the perception that the Heads of Department have regarding the application of the Administrative Process and the opinion that operative workers have regarding the phases of planning, organization, integration, direction, and control.


Author(s):  
Violeta Mendezcarlo Silva ◽  
Manuel Alejandro Lizardi-Jiménez

AbstractThe objective of this article is to review the environmental problems in Mexican state of San Luis Potosí (mining region) and the state of compliance with the right to a healthy environment. Our study helps to demonstrate complexity of the environmental impact in a broader context, if it is repeated in other mining regions of the non-developing world. The findings include heavy metals as lead and arsenic, in soil, with neurotoxic and carcinogenic properties. Impact on the biota as a whole, decrease of the biological activity and enzymatic inhibition. Heavy metals, including arsenic, mercury, cadmium and lead, as a product of the metallurgical and foundry industry were detected in children of the city of San Luis Potosí. Water contaminated with fluorine and arsenic, product of the extensive drilling of water wells and the transfer of contaminants from the mining and metallurgical industry. Air contaminated with heavy metals product of mining and metallurgy and hydrocarbons in urban and rural areas. Plastics as a global problem, but with the absence of local diagnosis, despite having one of the main pollution factors: industrial development. Hydrocarbons as pollution with very little diagnosis, beyond environmental emergencies. There is no evidence that the right to a healthy environment is fulfilled in the State of San Luis Potosí.


2015 ◽  
Vol 05 (01) ◽  
pp. 36-47
Author(s):  
Gaytán-Hernández Darío ◽  
Domínguez-Cortinas Gabriela ◽  
Mejía-Saavedra José de Jesús ◽  
Márquez-Mireles Leonardo Ernesto

2010 ◽  
Vol 100 (4) ◽  
pp. 234-234
Author(s):  
Leticia Pacheco ◽  
Andrés Sánchez-Morales

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Lizet Jarquín-Yañez ◽  
José de Jesús Mejía-Saavedra ◽  
Nelly Molina-Frechero ◽  
Enrique Gaona ◽  
Diana Olivia Rocha-Amador ◽  
...  

Objective. The aim of this study is to investigate urine fluoride concentration as a toxicity factor in a rural community in the state of San Luis Potosi, Mexico.Materials and Methods. A sample of 111 children exposed to high concentrations of fluoride in drinking water (4.13 mg/L) was evaluated. Fluoride exposure was determined by measuring urine fluoride concentration using the potentiometric method with an ion selective electrode. The diagnosis of dental fluorosis was performed by clinical examination, and the severity of damage was determined using Dean’s index and the Thylstrup-Fejerskov (TF) index.Results. The range of exposure in the study population, evaluated through the fluoride content in urine, was 1.1 to 5.9 mg/L, with a mean of 3.14 ± 1.09 mg/L. Dental fluorosis was present in all subjects, of which 95% had severe cases. Higher urine fluoride levels and greater degrees of severity occurred in older children.Conclusions. The results show that dental fluorosis was determined by the presence of fluoride exposure finding a high positive correlation between the severity of fluorosis and urine fluoride concentration and the years of exposure suggested a cumulative effect.


2021 ◽  
Vol 686 (1) ◽  
pp. 012027
Author(s):  
A C Tristán ◽  
M R Saldaña ◽  
A G C Ovalle ◽  
O R Cárdenas ◽  
T B Waskita ◽  
...  

2017 ◽  
Vol 6 (1) ◽  
pp. 103-117 ◽  
Author(s):  
Helen Berents ◽  
Charlotte Ten Have

Violence and insecurity are often read as totalising narratives of communities in parts of Latin America, flattening the complexity of everyday life and the responses of occupants who suffer from fear. In this article we draw on ethnographic research undertaken in los Altos de Cazucá in Colombia and in San Luis Potosí in Mexico. While both sites are distinct locations with different historic, economic, social and political contexts they share features of communities affected by violence and insecurity: distrust of institutions of the state; rationalisations for managing violence in daily life; and narratives of fear that appear woven through the fabric of conversations. However, fear and violence are not all-encompassing experiences and individuals in both these communities describe practices of navigation of violence that draw on positive communal experiences. This article explores how, in these communities where violence comes to be expected but never normalised, people navigate their everyday lives.


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