697 research outputs found
Pr?cticas de intimidaci?n escolar en la Instituci?n Educativa T?cnica Carlos Lleras Restrepo sede Ibagu?
106 p. Recurso ElectronicoLa presente investigaci?n tiene como prop?sito establecer las consecuencias de los
actos de acoso escolar en los estudiantes de la Instituci?n Educativa T?cnica Carlos
Lleras Restrepo de la ciudad de Ibagu?, determinando las pr?cticas de acoso escolar
m?s comunes, sus estrategias de y los efectos inmediatos en los estudiantes v?ctimas
de las pr?cticas de intimidaci?n que se suceden al interior del plantel educativo. Es un
trabajo investigativo de car?cter descriptivo de corte transversal y enfoque cuantitativo
porque se centra en el conteo y clasificaci?n de caracter?sticas de acoso escolar, para lo
cual se aplicaron dos cuestionarios, uno dirigido a los estudiantes de los grados d?cimo
y once y otro orientado hacia los profesores directores de grado y pasantes de dichos
cursos. Entre los resultados m?s destacados se constata que en la instituci?n educativa
tienen lugar todos los tipos de acoso, desde la m?s leve a la alta frecuencia, pero
sobresale la agresi?n verbal y f?sica directa e indirecta junto con la exclusi?n social,
siendo el patio de recreo y el aula de clases los escenarios preferidos para estas
conductas agresivas. Las estrategias de prevenci?n del acoso se centran
prioritariamente en sensibilizar al personal docente, concientizar a la comunidad
educativa, la aplicaci?n de sanciones estrictas al agresor o el di?logo y llegar a acuerdos
de no agresi?n. En cuanto a las consecuencias inmediatas se determina la p?rdida de la
autoestima, los trastornos f?sicos o psicosom?ticos, la ansiedad y el ausentismo colegial
y, a largo plazo, problemas psicol?gicos permanentes, depresi?n cr?nica, y
comportamientos autodestructivos. Por todo, proporciona informaci?n ?til a toda la
comunidad educativa para mejorar el conocimiento sobre el alcance del problema del
acoso en la instituci?n y las formas de prevenirlo.
Palabras Clave: acoso escolar, bullying, pr?cticas de intimidaci?n, convivencia escolar,
ciberacosoThe purpose of this research is to establish the consequences of the acts of bullying in
the students of the Carlos Lleras Restrepo Technical educational institution of the city of
Ibague, determining the most common bullying practices, their Strategies and immediate
effects on student?s victims of bullying practices that occur within the educational campus.
It is a descriptive investigative work of cross-cutting and quantitative focus because it
focuses on the counting and classification of bullying characteristics, for which two
questionnaires were applied, one aimed at students of the grades Tenth and eleven and
another oriented towards the professors of grade and interns of these courses. Among
the most notable results, it is noted that in the educational institution all types of
harassment take place, from the slightest to the high frequency, but the direct and indirect
physical and verbal aggression with the social exclusion stands out, being the patio of
Recreation and classroom the preferred scenarios for these aggressive behaviors.
Harassment prevention strategies focus primarily on sensitizing teachers, raising
awareness to the educational community, applying strict penalties to the aggressor or
dialogue, and reaching non-aggression agreements. In terms of immediate
consequences, the loss of self-esteem, physical or psychosomatic disorders, anxiety and
collegiate absenteeism and, in the long term, permanent psychological problems, chronic
depression, and behaviors are determined. Destructive. For everything, it provides useful
information to the entire educational community to improve awareness of the extent of
the problem of bullying in the institution and ways to prevent it.
Keywords: bullying, bullying, bullying, school coexistence, cyberbullying
Development of active and nanotechnology-based smart edible packaging systems: physical-chemical characterization
This work aims at characterising polysaccharide-based films without (GA) and with the incorporation of free natamycin (GA-NA) and natamycin-loaded in a smart delivery device consisting in poly(N-isopropylacrylamide) nanohydrogels (GA-PNIPA). Transport properties (water vapour, oxygen and carbon dioxide permeabilities), mechanical properties (tensile strength and elongation-at-break), opacity, water sensitivity (moisture content and contact angle) and thermal properties (differential scanning calorimetry and thermogravimetric analyses) were evaluated. Chemical interactions were studied by means of Fourier transform infrared spectroscopy and scanning electron microscopy was used to verify the presence of natamycin and nanohydrogel particles in the film matrix. The results show that natamycin and natamycin-loaded poly(N-isopropylacrylamide) (PNIPA) nanohydrogels can be successfully added to edible films without changing their main packaging properties. However, tensile strength decreased (p < 0.05) when both natamycin and natamycin-loaded PNIPA nanohydrogels were incorporated (from 24.44 to 17.02 and 16.63 MPa, for GA-NA and GA-PNIPA, respectively). GA-NA and GA-PNIPA films are more opaque and showed to be more sensitive to water (i.e. higher values of moisture content and decrease of contact angle) than GA films. Scanning electron microscopy images confirmed the presence of natamycin and poly(N-isopropylacrylamide) nanohydrogels in the films’ matrix. Since natamycin could be successfully released from polysaccharide-based films, the system could be used as active packaging ingredient when used free in the matrix or as smart packing when loaded with PNIPA nanohydrogels.Miguel A. Cerqueira (SFRH/BPD/72753/2010) is a recipient of a fellowship from the Fundacao para a Ciencia e Tecnologia (FCT, POPH-QREN and FSE Portugal). The support of EU Cost Actions FA0904 and FA1001 is gratefully acknowledged
Structural characterization and release profile of omega-3 fatty-acids encapsulated in nanoemulsions
Omega-3 (-3) fatty-acids are functional compounds with various benefits such as reduction of cardiovascular diseases. However, these fatty acids degrade quickly, present low water solubility and an unpleasant aroma, which make essential their encapsulation. The encapsulation (e.g. nanoemulsion production) process can change structural properties, which can affect the behavior of the system when applied to food matrices and within the gastrointestinal tract.
The objective of this work was to characterize oil-in-water bio-based nanoemulsions with -3 using lactoferrin as a natural emulsifier, when submitted to different drying processes.
Nanoemulsions were produced using high-pressure homogenization (5 cycles, 20,000 psi) using 2 % (w/w) lactoferrin and 5 % (w/w) -3. Nanoemulsions were dried by nanospray-drying (Nano Spray dryer B-90HP, Buchi) and freeze-drying methods. Physical and morphological properties were evaluated using dynamic light scattering (DLS) and transmission electron microscopy (TEM), respectively. Circular dichroism (CD) and FTIR-ATR were used to assess possible structural and chemical changes after dry treatments. Moreover, -3 release profile was studied in ethanol (20 % and 50 % (v/v)) at 25 ºC (simulation of food matrices) and at pH 7.4 and pH 2 at 37 ºC (simulation of different gastrointestinal phases).
DLS results showed that original size (170 nm) and zeta-potential (+30 mV) of nanoemulsions was not achieved after nanospray-drying process probably caused by protein agglomeration. CD and FTIR-ATR results revealed lactoferrin structural modifications after drying processes as well as a reduction of -helix and -sheet content, being this effect more evident on nanospray-drying samples. FTIR-ATR results showed shifts of the amide I and amide II bands in both drying processes samples. At 20 % ethanol, -3 began to release after 48h which could allow nanoemulsions incorporation in food products such as ice cream and mayonnaise.
This work provides useful information to design nanoemulsions aiming lipophilic compound encapsulation for food applications.info:eu-repo/semantics/publishedVersio
Creating functional nanostructures: Encapsulation of caffeine into α-lactalbumin nanotubes
This work evaluated the stability and functionality of nanotubes obtained from α-lactalbumin (α-LA). α-LA nanotubes' structure was highly stable during a freeze-drying process but not after grinding. The ability of α-LA nanotubes to encapsulate caffeine, used as a model molecule, was evaluated. α-La nanotubes were highly effective for this purpose as encapsulation efficiency (%EE) was near 100% and loading capacity (%LC) near 10% at 1.5/20 and 2/20 ratios (caffeine/α-LA, w/w). α-LA nanotubes' structure was not affected by the presence of caffeine. Also, in general, refrigeration temperatures and neutral or alkaline conditions, under which the adverse effect of chelating agents was prevented, helped to stabilise α-LA nanotubes' structure and maintain caffeine encapsulated. At 8 °C and pH 7.5, in the presence of 75 μg mL− 1 of EDTA, > 50% of the caffeine remained encapsulated into α-LA nanotubes.Clara Fuciños gratefully acknowledge her Post-Doctoral grant (I2C 2014) from Consellería de Cultura, Educación e Ordenación Universitaria (Xunta de Galicia, Spain). Pablo Fuciños gratefully acknowledges his Marie Curie COFUND Postdoctoral Research Fellowship (Project No: 600375. NanoTRAINforGrowth - INL Fellowship programme in nanotechnologies for biomedical, environment and food applications). This study was supported by the Fundação para a Ciência e a Tecnologia (FCT) under the scope of the strategic funding of UID/BIO/04469/2013 unit and COMPETE 2020 (POCI-01-0145-FEDER-006684), and the Project RECI/BBB-EBI/0179/2012 (FCOMP-01-0124-FEDER-027462)
Design of graphene-based TiO2 photocatalysts - A review
There is a recent increase in the interest of de-
signing high-performance photocatalysts using graphene-
based materials. This review gathers some important aspects
of graphene–TiO 2 , graphene oxide–TiO 2 , and reduced gra-
phene oxide–TiO 2 composites, which are of especial rele-
vance as next generation photocatalysts. The methods used
for the preparation of these materials, the associated mech-
anistic fundamentals, and the application of graphene-based
composites on the photocatalytic degradation of pollutants
are reviewed. Some structural, textural, and chemical prop-
erties of these materials and other photo-assisted applica-
tions, such as hydrogen production from water splitting and
dye-sensitized solar cells, are also briefly includedFinancial support for this work was provided by
the European Commission (Clean Water—grant agreement no 227017)
and by Fundação para a Ciência e a Tecnologia (FCT) and FEDER
under Program COMPETE, project FCOMP-01-0124-FEDER-022706
(Ref. FCT Pest-C/EQB/LA0020/2011) and FCOMP-01-0124-FEDER-
008442 (Ref. NANO/NTec-CA/0046/2007). Clean Water is a Collab-
orative Project co-funded by the Research DG of the European Com-
mission within the joint RTD activities of the Environment and NMP
Thematic Priorities. SMT and AMTS acknowledge financial support
from SFRH/BPD/74239/2010 and POCI/N010/2006, respectively
Development of electrospun active films of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) by the incorporation of cyclodextrin inclusion complexes containing oregano essential oil
[EN] This paper reports the development of biodegradable active packaging films of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) by the incorporation of alpha- and gamma-cyclodextrins (alpha-CD and gamma-CDs) containing oregano essential oil (OEO). Herein, both the kneading method (KM) and freeze-drying method (FDM) were first explored for the preparation of alpha-CD:OEO and gamma-CD:OEO inclusion complexes at host:guest ratios of 80:20 wt/wt and 85:15 wt/wt, respectively. The results showed that KM was the most efficient method for the encapsulation of OEO in the CDs cavity in terms of simplicity and rapidity, while it was also yielded the inclusion complexes with the highest antimicrobial and antioxidant performance. The alpha-CD:OEO and gamma-CD:OEO inclusion complexes obtained by KM were thereafter incorporated at 10, 15, 20, 25, and 30 wt% into PHBV fibres by electrospinning and annealed at 160 degrees C to produce contact transparent films. It was observed that the optimal concentration of alpha-CD:OEO and gamma-CD:OEO inclusion complexes for homogeneous and continuous film formation was attained at contents of 15 and 25 wt%, respectively. Higher antimicrobial and antioxidant activities were obtained for the gamma-CD:OEO inclusion complexes due to the greater encapsulation efficiency of OEO in gamma-CD, resulting in PHBV films with good performance for up to 15 days. This aspect, together with their improved thermal stability and mechanical strength, give interesting applications to these biopolymer films in the design of active-releasing packaging materials to maintain the physical, chemical, and microbiological characteristics of food products.The authors would like to thank the Unidad Asociada IATA-UJI "Plastics Technology" and the Spanish Ministry of Science and Innovation (MICI) project RTI 2018-097249-B-C21 and the H2020 EU project YPACK (reference number 773872) for funding. Kelly J. Figueroa-Lopez and S. Torres-Giner are recipients of a Grisolia scholarship (Ref. 0001426013N810001A201) of the Valencian Government (GVA) and a Juan de la Cierva-Incorporaci.on contract (IJCI-2016-29675) from MICI, respectively.Figueroa-Lopez, K.; Enescu, D.; Torres-Giner, S.; Cabedo, L.; Cerqueira, M.; Pastrana, L.; Fuciños, P.... (2020). Development of electrospun active films of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) by the incorporation of cyclodextrin inclusion complexes containing oregano essential oil. Food Hydrocolloids. 108:1-18. https://doi.org/10.1016/j.foodhyd.2020.106013S118108Ashori, A., Jonoobi, M., Ayrilmis, N., Shahreki, A., & Fashapoyeh, M. A. (2019). Preparation and characterization of polyhydroxybutyrate-co-valerate (PHBV) as green composites using nano reinforcements. International Journal of Biological Macromolecules, 136, 1119-1124. doi:10.1016/j.ijbiomac.2019.06.181Aytac, Z., Ipek, S., Durgun, E., Tekinay, T., & Uyar, T. (2017). 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Beta-carotene loaded oleogels’ texture and disintegration behaviour during in-vitro digestion
Food
products are digested in
different
ways
; rigidity and different textures are characteristics
that
will influence how digestion will occur.
Absorption of lipids
and lipid-soluble components from food
is
quite
complex and factors like lipid composition, breakdown of food matrices, emulsion droplet
size and lipid solubilization within mixed micelles of bile salts will influence the digestive process
(Dickinson, 2014)
. In this work, two types of edible oleogels loaded with beta-carotene (0.01 %
w/w) have been developed. The oleogels were produced through the gelling process of long chain
triglycerides (oil phase) with a sterol-mix (formed by gamma-oryzanol and beta-sitosterol) or beeswax as the two
oil gelators. We report on the morphological and textural characteristics, as
well as on the cytotoxicity and digestive behaviour of the oleogels during a digestion simulation
(i.e. mouth, stomach and small intestine) using a static harmonized
in-vitro digestion method
(Minekus et al., 2014).
Textural results showed that sterol-based oleogels have an average hardness of 0.6 N, which is approximately 4 times higher than the values recorded for beeswax
oleogels. Both gels presented adhesiveness values without significative differences.
In-vitro
digestion allowed concluding that both types of oleogels showed structural disintegration, namely
during the final two steps that correspond to gastric and intestinal phase (as evaluated by visual
inspection and fluorescence microscopy analysis). In addition, beeswax oleogels’ structure was
less resilient than oryzanol oleogels. Cytotoxicity tests, using a human epithelial cell line (Caco-2) with PrestoBlue assay, showed that both undigested sterol-and beeswax-based oleogels (without beta-carotene) were not cytotoxic, up to 48 hours of contact . Beeswax-based oleogels
loaded with beta-carotene showed the same non-toxic behaviour under the same conditions.
Future work will be performed aiming at establishing the rel
ationship between gels’ disintegration
and beta-carotene bioavailabilityinfo:eu-repo/semantics/publishedVersio
Effect of structure and concentration of gelator on organogels properties : a rheological and small-angle X-ray spectroscopy study (Young Scientist Award Winner)
Food Perceptions and Dietary Changes for Chronic Condition Management in Rural Peru: Insights for Health Promotion.
Peru is undergoing a nutrition transition and, at the country level, it faces a double burden of disease where several different conditions require dietary changes to maintain a healthy life and prevent complications. Through semistructured interviews in rural Peru with people affected by three infectious and noninfectious chronic conditions (type 2 diabetes, hypertension, and neurocysticercosis), their relatives, and focus group discussions with community members, we analyzed their perspectives on the value of food and the challenges of dietary changes due to medical diagnosis. The findings show the various ways in which people from rural northern Peru conceptualize good (buena alimentación) and bad (mala alimentación) food, and that food choices are based on life-long learning, experience, exposure, and availability. In the context of poverty, required changes are not only related to what people recognize as healthy food, such as fruits and vegetables, but also of work, family, trust, taste, as well as affordability and accessibility of foods. In this paper we discuss the complexity of introducing dietary changes in poor rural communities whose perspectives on food are poorly understood and rarely taken into consideration by health professionals when promoting behavior change
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