19 research outputs found
Antifungal Activity of Chitosan against Postharvest Fungi of Tropical and Subtropical Fruits
In the present chapter, results about the efficacy of chitosan (Chi) on sporulation, mycelial growth, germination, as well as quality parameters on fruits are shown. The results demonstrate that chitosan can control various phytopathogen isolates from diverse fruits. The pathogens in the genera Colletotrichum, Fusarium, and Rhizopus are involved in important postharvest disease losses throughout the world. In Nayarit, producers had reported high postharvest losses not only at field but also during the commercial chain with their products, besides the resistance of several pathogens to fungicides, which traditionally are applied for controlling diseases. In this sense, the aim of this research group is focused on the research of alternative and effective methods for controlling postharvest diseases. In vivo results are promising due to a good control in important tropical fruits like banana, avocado, mango, and jackfruit. An enhancement in the chitosan antimicrobial activity is reported with the combination with GRAS substances, as well as the use of nanotechnology. Chitosan can be an environment-friendly alternative to the use of chemical fungicides for controlling postharvest diseases in fruits
A Review Study on the Postharvest Decay Control of Fruit by <em>Trichoderma</em>
This chapter consists of an overview with the most relevant results about the efficacy of Trichoderma on postharvest disease control. The results of investigations demonstrate that this fungus can control several phytopathogens in different fruits. Postharvest losses represent a major problem in several countries. The constant application of fungicides not only at field but also at postharvest stage has led to microbial resistance cases, which make the control of these pathogens difficult. Biological control is a promising alternative to chemical fungicide applications. In this sense, an eco-friendly alternative and effective approach for controlling diseases is the use of microbial antagonists like Trichoderma, which have several mechanisms of action to stop disease development. A crucial treat in biological control is related to the maintenance of microbial viability and efficacy, that is why other technologies like their incorporation into edible films and coatings, nanotechnology, microbial mixtures, among others have been applied in combination with Trichoderma successfully. An enhancement in biocontrol activity is achieved when alternative systems are combined like GRAS substances, biopolymers, and other antagonists. Thus, Trichoderma is an eco-friendly alternative to threat postharvest diseases as an alternative to chemical treatments
EVALUACIÓN in vitro DE PRODUCTOS QUÍMICOS NO CONVENCIONALES PARA EL CONTROL DE Penicillium citrinum.
El ajo (Allium sativumL.), es un cultivo que esta expuesto al ataque de patógenos importantes del género Penicillium provocando pérdidas económicas importantes. De manera tradicional, la alternativa para controlar fitopatógenos es mediante la aplicación de fungicidas sintéticos. Sin embargo, debido a la aparición de cepas resistentes y problemas ambientales, es necesario la búsqueda de tratamientos alternativos que sean efectivos y amigables con el medio ambiente. En este sentido, el uso de quitosano, peróxido de hidrógeno (H2O2), sorbato de potasio (SP) y bicarbonato de sodio (BS) representa una alternativa amigable con el medio ambiente con propiedades antimicrobianas. En este estudio, P. citrinum fue aislado e identificado mediante herramientas moleculares. En el ensayo in vitro, el H2O2al 0.5%, el BS al 3% y el quitosano al 1% resultaron efectivos en la inhibición del desarrollo del patógeno (crecimiento micelial, esporulación y germinación). Se observó un efecto sinérgico de los tratamientos evaluados en combinación a bajas concentraciones. Por lo tanto, los tratamientos evaluados pueden ser una alternativa viable y amigable con el medio ambiente el control de P. citrinumen ajo
Responsabilidad Social y Ciudadanía: Una perspectiva desde la universidad y la administración pública
La importancia de los estudios sobre ciudadanía se vincula con la imperiosa necesidad de fortalecer la democracia en todos aquellos espacios donde se manifiesta, principalmente en países como México, donde la falta de credibilidad en las instituciones democráticas ha permeado a la sociedad.Los desafíos contemporáneos requieren nuevos ajustes en diversos sentidos; al interior de las organizaciones es necesario adecuar los mecanismos con que interactúan frente a la sociedad en la que se desarrollan. Es requisito indispensable que el grueso de las organizaciones sociales se vinculen de manera directa con los problemas globales y nacionales: cambio climático, guerras, exigencias democráticas, movimientos sociales, pobreza, desempleo, inestabilidades políticas etc., ello les exige que se asuman como parte del complejo social, donde sus acciones repercuten de forma directa o indirecta
Alternative Eco-Friendly Methods in the Control of Post-Harvest Decay of Tropical and Subtropical Fruits
The effectiveness on several fruits by the application of alternative methods against fungi is summarized in the present chapter. Several investigations have reported the efficacy of these technologies for controlling fungal infections. Currently, high post-harvest loses have been reported due to several factors such as inefficient management, lack of training for farmers, and problems with appropriate conditions for storage of fruits and vegetables. Even now, in many countries, post-harvest disease control is led by the application of chemical fungicides. However, in this time, awareness about fungi resistance, environmental, and health issues has led to the research of eco-friendly and effective alternatives for disease management. The pathogen establishment on fruits can be affected by the application of GRAS compounds like chitosan, essential oils, salts, among others; besides, their efficacy can be enhanced by their combination with other technologies like ultrasound. Thus, the applications of these alternatives are suitable approaches for post-harvest management of fruits
Informe sobre la producción científica de Venezuela en revistas iberoamericanas de acceso abierto en redalyc.org, 2005-2011
Objetivo: Proporcionar información sobre el Perfil de Producción Científica de Venezuela en revistas del acervo redalyc.org para el periodo 2005-2011, con el fin de conocer cuáles son tanto las tendencias como el comportamiento de las estrategias de comunicación y de colaboración que registran los artículos producidos por los investigadores venezolanos.Método: Se estudia la producción científica de 800 revistas iberoamericanas de acceso abierto durante 2005-2011, a partir de un modelo de análisis centrado en entidades de producción y comunicación, las cuales permiten generar un Perfil de Producción Científica según los indicadores de: Producción (P), Producción en Colaboración (PC) y Colaboración (C), aplicados a un núcleo de 145,515 artículos científicos que forman parte del acervo redalyc.org.Resultados: La producción científica de Venezuela asciende a 7,394 artículos que corresponden a una aportación de 5.1% sobre el total analizado, de los cuales 23.4% fueron publicados en revistas extranjeras, y donde poco más de la mitad corresponde al área de ciencias sociales (54.2%), seguida de ciencias con 35.3%, mientras que artes y humanidades alcanza 5.3% y multidisciplinaria 5.2%. Las instituciones venezolanas con mayor aporte a la producción científica son la Universidad de Zulia (LUZ), la Universidad Central de Venezuela (UCV) y la Universidad de los Andes (ULA); mientras que 60.7% de los trabajos firmados por autores nacionales se han realizado en colaboración, principalmente de tipo nacional e institucional (61.7%), y donde la participación de autores del extranjero se vincula prioritariamente con México, Colombia, España y Chile, que en conjunto representan el 71.3% de la producción de Venezuela en colaboración con otros países
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The interplay of climate and land use change affects the distribution of EU bumblebees
Bumblebees in Europe have been in steady decline since the 1900s. This decline is expected to continue with climate change as the main driver. However, at the local scale, land use and land cover (LULC) change strongly affects the occurrence of bumblebees. At present, LULC change is rarely included in models of future distributions of species. This study's objective is to compare the roles of dynamic LULC change and climate change on the projected distribution patterns of 48 European bumblebee species for three change scenarios until 2100 at the scales of Europe, and Belgium, Netherlands and Luxembourg (BENELUX). We compared three types of models: (1) only climate covariates, (2) climate and static LULC covariates and (3) climate and dynamic LULC covariates. The climate and LULC change scenarios used in the models include, extreme growth applied strategy (GRAS), business as might be usual and sustainable European development goals. We analysed model performance, range gain/loss and the shift in range limits for all bumblebees. Overall, model performance improved with the introduction of LULC covariates. Dynamic models projected less range loss and gain than climate-only projections, and greater range loss and gain than static models. Overall, there is considerable variation in species responses and effects were most pronounced at the BENELUX scale. The majority of species were predicted to lose considerable range, particularly under the extreme growth scenario (GRAS; overall mean: 64% +/- 34). Model simulations project a number of local extinctions and considerable range loss at the BENELUX scale (overall mean: 56% +/- 39). Therefore, we recommend species-specific modelling to understand how LULC and climate interact in future modelling. The efficacy of dynamic LULC change should improve with higher thematic and spatial resolution. Nevertheless, current broad scale representations of change in major land use classes impact modelled future distribution patterns.Peer reviewe
Mortality from gastrointestinal congenital anomalies at 264 hospitals in 74 low-income, middle-income, and high-income countries: a multicentre, international, prospective cohort study
Summary
Background Congenital anomalies are the fifth leading cause of mortality in children younger than 5 years globally.
Many gastrointestinal congenital anomalies are fatal without timely access to neonatal surgical care, but few studies
have been done on these conditions in low-income and middle-income countries (LMICs). We compared outcomes of
the seven most common gastrointestinal congenital anomalies in low-income, middle-income, and high-income
countries globally, and identified factors associated with mortality.
Methods We did a multicentre, international prospective cohort study of patients younger than 16 years, presenting to
hospital for the first time with oesophageal atresia, congenital diaphragmatic hernia, intestinal atresia, gastroschisis,
exomphalos, anorectal malformation, and Hirschsprung’s disease. Recruitment was of consecutive patients for a
minimum of 1 month between October, 2018, and April, 2019. We collected data on patient demographics, clinical
status, interventions, and outcomes using the REDCap platform. Patients were followed up for 30 days after primary
intervention, or 30 days after admission if they did not receive an intervention. The primary outcome was all-cause,
in-hospital mortality for all conditions combined and each condition individually, stratified by country income status.
We did a complete case analysis.
Findings We included 3849 patients with 3975 study conditions (560 with oesophageal atresia, 448 with congenital
diaphragmatic hernia, 681 with intestinal atresia, 453 with gastroschisis, 325 with exomphalos, 991 with anorectal
malformation, and 517 with Hirschsprung’s disease) from 264 hospitals (89 in high-income countries, 166 in middleincome
countries, and nine in low-income countries) in 74 countries. Of the 3849 patients, 2231 (58·0%) were male.
Median gestational age at birth was 38 weeks (IQR 36–39) and median bodyweight at presentation was 2·8 kg (2·3–3·3).
Mortality among all patients was 37 (39·8%) of 93 in low-income countries, 583 (20·4%) of 2860 in middle-income
countries, and 50 (5·6%) of 896 in high-income countries (p<0·0001 between all country income groups).
Gastroschisis had the greatest difference in mortality between country income strata (nine [90·0%] of ten in lowincome
countries, 97 [31·9%] of 304 in middle-income countries, and two [1·4%] of 139 in high-income countries;
p≤0·0001 between all country income groups). Factors significantly associated with higher mortality for all patients
combined included country income status (low-income vs high-income countries, risk ratio 2·78 [95% CI 1·88–4·11],
p<0·0001; middle-income vs high-income countries, 2·11 [1·59–2·79], p<0·0001), sepsis at presentation (1·20
[1·04–1·40], p=0·016), higher American Society of Anesthesiologists (ASA) score at primary intervention
(ASA 4–5 vs ASA 1–2, 1·82 [1·40–2·35], p<0·0001; ASA 3 vs ASA 1–2, 1·58, [1·30–1·92], p<0·0001]), surgical safety
checklist not used (1·39 [1·02–1·90], p=0·035), and ventilation or parenteral nutrition unavailable when needed
(ventilation 1·96, [1·41–2·71], p=0·0001; parenteral nutrition 1·35, [1·05–1·74], p=0·018). Administration of
parenteral nutrition (0·61, [0·47–0·79], p=0·0002) and use of a peripherally inserted central catheter (0·65
[0·50–0·86], p=0·0024) or percutaneous central line (0·69 [0·48–1·00], p=0·049) were associated with lower mortality.
Interpretation Unacceptable differences in mortality exist for gastrointestinal congenital anomalies between lowincome,
middle-income, and high-income countries. Improving access to quality neonatal surgical care in LMICs will
be vital to achieve Sustainable Development Goal 3.2 of ending preventable deaths in neonates and children younger
than 5 years by 2030