Institution
Instituto Politécnico Nacional
Education•Mexico City, Mexico•
About: Instituto Politécnico Nacional is a education organization based out in Mexico City, Mexico. It is known for research contribution in the topics: Population & Context (language use). The organization has 43351 authors who have published 63315 publications receiving 938532 citations. The organization is also known as: Instituto Politécnico Nacional & Instituto Politecnico Nacional.
Topics: Population, Context (language use), Catalysis, Control theory, Thin film
Papers published on a yearly basis
Papers
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Evanthia Mantzouki1, Miquel Lürling2, Jutta Fastner3, Lisette N. de Senerpont Domis2 +196 more•Institutions (68)
TL;DR: Direct and indirect effects of temperature were the main drivers of the spatial distribution in the toxins produced by the cyanobacterial community, the toxin concentrations and toxin quota, and a Toxin Diversity Index (TDI) increased with latitude, while it decreased with water stability.
Abstract: Insight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their potency. Most studies examine the relationship between individual toxin variants and environmental factors, such as nutrients, temperature and light. In summer 2015, we collected samples across Europe to investigate the effect of nutrient and temperature gradients on the variability of toxin production at a continental scale. Direct and indirect effects of temperature were the main drivers of the spatial distribution in the toxins produced by the cyanobacterial community, the toxin concentrations and toxin quota. Generalized linear models showed that a Toxin Diversity Index (TDI) increased with latitude, while it decreased with water stability. Increases in TDI were explained through a significant increase in toxin variants such as MC-YR, anatoxin and cylindrospermopsin, accompanied by a decreasing presence of MC-LR. While global warming continues, the direct and indirect effects of increased lake temperatures will drive changes in the distribution of cyanobacterial toxins in Europe, potentially promoting selection of a few highly toxic species or strains.
136 citations
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TL;DR: The usefulness of corpus-based analysis to discover the linguistic patterns selected and favoured by a specific genre is revealed and the selection of specific collocates for these frameworks is conditioned by the linguistic conventions of the genre.
136 citations
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TL;DR: In this paper, the main results of an experimental and numerical investigation on the mechanical behaviour of a composite sandwich primarily designed for naval engineering applications are presented; the skeleton of the sandwich is made of glass-fibre/polymer-matrix composites; their interior layers are connected with interwoven threads called piles which cross the sandwich core.
136 citations
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TL;DR: In this paper, the authors investigate the factors preceding the formation of entrepreneurial intention among secondary students, both studying general academic and specific professional programs, and establish causal relationships between psychological, demographic and behavioural factors.
Abstract: Purpose
– Based on the Theory of Planned Behaviour (TPB), the purpose of this paper is to approach entrepreneurial intention (EI) and the factors preceding the founding of EI among secondary students, both studying general academic and specific professional programs, and thereby establish causal relationships between psychological, demographic and behavioural factors.
Design/methodology/approach
– A sample of secondary students, both studying general academic and specific professional programs, was chosen. Data were collected through questionnaires and analysed with resource to structural equation models (SEM) to measure the causal relationships among different constructs.
Findings
– The results show that the EI of secondary school students is influenced by such demographic, psychological and behavioural factors. However, the hypothesis of becoming entrepreneurs in the future remains independent of the fact of whether or not students had already experienced engagement with entrepreneurship‐related themes having no impact on EI. These results raise a series of pertinent questions and deserve being subject to a more profound reflection and not only among the scientific and academic community but also among political and government entities.
Originality/value
– The paper provides important evidence to expand entrepreneurship education specifically in the field of secondary school education. These students are already about to face choices over their professional careers. This remains valid whether or not students intend to proceed with higher education studies or to join the workforce. Therefore this research contributes towards meeting a better understanding of EI and the factors preceding the formation of this intention among secondary school students.
136 citations
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TL;DR: Stenotrophomonas maltophilia, Rahnella aquatilis, Raoultella terrigena, Ponticoccus gilvus, and Kocuria marina associated with larvae or adults of Dendroctonus rhizophagus could be implicated in nitrogen fixation and cellulose breakdown, important roles associated to insect development and fitness, especially under the particularly difficult life conditions of this beetle.
Abstract: Dendroctonus rhizophagus Thomas and Bright (Curculionidae: Scolytinae) is an endemic economically important insect of the Sierra Madre Occidental in Mexico. This bark beetle has an atypical behavior within the genus because just one beetle couple colonizes and kills seedlings and young trees of 11 pine species. In this work, the bacteria associated with the Dendroctonus rhizophagus gut were analyzed by culture-dependent and culture-independent methods. Analysis of 16S rRNA sequences amplified directly from isolates of gut bacteria suggests that the bacterial community associated with Dendroctonus rhizophagus, like that of other Dendroctonus spp. and Ips pini, is limited in number. Nine bacterial genera of γ-Proteobacteria and Actinobacteria classes were detected in the gut of Dendroctonus rhizophagus. Stenotrophomonas and Rahnella genera were the most frequently found bacteria from Dendroctonus rhizophagus gut throughout their life cycle. Stenotrophomonas maltophilia, Ponticoccus gilvus, and Kocuria marina showed cellulolytic activity in vitro. Stenotrophomonas maltophilia, Rahnella aquatilis, Raoultella terrigena, Ponticoccus gilvus, and Kocuria marina associated with larvae or adults of Dendroctonus rhizophagus could be implicated in nitrogen fixation and cellulose breakdown, important roles associated to insect development and fitness, especially under the particularly difficult life conditions of this beetle.
135 citations
Authors
Showing all 43548 results
Name | H-index | Papers | Citations |
---|---|---|---|
Giacomo Bruno | 158 | 1687 | 124368 |
Giuseppe Mancia | 145 | 1369 | 139692 |
Giorgio Maggi | 135 | 1323 | 90270 |
Salvatore Nuzzo | 133 | 1533 | 91600 |
Giuseppe Iaselli | 133 | 1514 | 91558 |
Marcello Abbrescia | 132 | 1400 | 84486 |
Louis Antonelli | 132 | 1089 | 83916 |
Donato Creanza | 132 | 1452 | 89206 |
Alexis Pompili | 131 | 1437 | 86312 |
Gabriella Pugliese | 131 | 1309 | 88714 |
Giovanna Selvaggi | 131 | 1159 | 83274 |
Heriberto Castilla-Valdez | 130 | 1659 | 93912 |
Ricardo Lopez-Fernandez | 129 | 1213 | 81575 |
Cesare Calabria | 128 | 1095 | 76784 |
Paolo Vitulo | 128 | 1120 | 79498 |