223 238 10 2

This document analyses Syria’s access to the Chemical Weapons Convention (CWC) in the framework of the Decision of the Executive Council of the Organisation for the Prohibition of Chemical Weapons (OPCW) of 27 September and the UN Security Council resolution of the same day. Both arise as a result o...

On 19 March 2013, the Syrian government and the rebel opposition accused each other of a chemical attack on the population near the city of Aleppo. The incident resulted in 25 fatalities and many injuries. The compound used according to Syrian sources could be chlorine. This has marked an escalation...

This article, after defining irradiation and describing the usual procedures for irradiation, examines the nature of gamma electromagnetic radiation and its nuclear origin in order to be able to demonstrate that irradiation does not render foodstuffs radioactive and to understand the activity of sou...

The aim of this work is to examine the design of support strategies developed by future secondary school teachers to guide students in the resolution of a chemical link research activity. The participants are 17 future teachers in the teaching course of the physics and chemistry of the Master’s Teac...

This work presents an analysis of the treatment of the chemical link concept in the textbooks of secondary education in Spain. A comparative case study has been carried out of three of the most frequently used publishers, for which one heading was developed with six categories: sequencing of content...

This article presents a historical review of the knowledge, facts, controversies and characters that influenced the chemistry August Kekulé by developing the first accepted chemical characterisation of benzene, the structural unity of aromatic compounds. Due to the nature of the knowledge involved,...

The objective of this work is to explore the possibilities of a multisensory system, electronic nose type, for the detection of organophosphorus pesticides in the peach tree (Prunus persica), cultivated in the department of Norte de Santander, Colombia. The tests were performed with an electronic no...

The development of nanopharmaceuticals applied in cancer therapies is a promising field of biomedicine in which different scientific disciplines are intertwined such as biology, material science, chemistry, medicine and pharmacy. The clinical application of this type of material is intended to overc...

Aunque el enlace juega un papel importante en las predicciones, intervenciones y explicaciones químicas, no obstante, es un concepto difícil de definir con precisión. Esta situación parece poner de manifiesto la incertidumbre o tal vez la ambivalencia sobre el estatus del enlace químico, lo que llev...

Human beings by consuming synthetic colouring agents are affected in their health, and the use of natural colours obtained from fruits, plants and plants, which, in addition to their low costs, are healthy, is therefore sought. The aim of this investigation is to extract natural dyes from the leaves...

This article describes a teaching strategy for the teaching of a miniaturised solid phase extraction method in contexts of practical laboratory work [TPL]. Students’ previous imaginaries are based on some laboratory sessions to generate conceptual changes and promote meaningful learning. This work w...

From the case of a plant of a multinational chemical company, this article analyses the institutionalisation of a trade union renewal experience since the 2000s. Discussing a classic approach to ‘grassroots’ trade unions as a body of direct democracy and unmediated relations with workers, we analyse...

Finally, the destruction of Syria’s chemical weapons will take place outside its territory. According to experts, it is the most feasible option for the process to be carried out in a swift and safe way, although it is clear that its transportation will become an extremely complex process. The opera...

Presents the project aimed at highlighting the old funds relevant to the study of the history of chemistry, which are found in the Historical Library “Marqués de Valdecilla” of the Complutense University of Madrid, in libraries belonging to the Consejo Superior de Investigaciones Ciíficas (Higher Co...

Metal materials usually have good heat and power conductive properties, however, there is always some resistance to electric current. This conductivity restriction leads to energy losses and should be considered by the engineer in the design of the line. For this purpose, the feature sheet of a comm...

the international community, under the auspices of the Organisation for the Prohibition of Chemical Weapons and the United Nations, is currently engaged in the task of destroying Syrian chemical weapons. In the past, many nations have been deprived of their chemical arsenal using techniques that do...

This research work, which is clearly interdisciplinary in nature, focuses on a study in which historical and artistic data have been combined together with extensive radiographic documentation, plus an extensive stratigraphic and chemical study using optical microscopy and scanning electron microsco...

In this research, a model for educational planning of teaching is presented; the design is based on Didactic Units and the perspectives to higher level education. This is intended to enhance understanding of Chemical Bonding Concept, identifying some of the difficulties students have to understand t...

A literature review compared the existing methods for controlling salivazo or pinta flies, analysing the advantages and disadvantages of each of them. Articles were obtained in databases, magazines and publications of the last five years and the information related to the flies and methods for its c...

We present the study of the correlation between analogue thinking and modelling competence, through different dimensions related to the representational and metarrepresentational component of such variables. The research scenario is the implementation of a teaching proposal on chemical change for th...

The results of a research using the 4Mat System of learning styles proposed by Bernice McCarthy for the design and implementation of a learning unit to determine its influence on the learning of the Chemical Change Conceptual Network are presented below. The research was carried out with 26 students...