75 research outputs found
Uso de fungicidas y tratamiento tĂŠrmico postcosecha para control de antracnosis en frutos PAPAYA MARADOL
Uno de los problemas que provocan mayores pĂŠrdidas en el manejo postcosecha de papaya es la incidencia de antracnosis provocada por el hongo Colletotrichum gloeosporioides Penz y uno de los fungicidas mĂĄs utilizados para su control ha sido el thiabendazol; sin embargo, su efectividad se ha visto disminuida por la resistencia del hongo, por lo que el uso de nuevos fungicidas en el manejo postcosecha de papaya es necesario para reducir las pĂŠrdidas ocasionadas por esta enfermedad. El objetivo de este trabajo fue evaluar la efectividad biolĂłgica (in vitro e in vivo) de los fungicidas azoxystrobin, trifloxystrobin, pyraclostrobin, prochloraz y thiabendazol y un tratamiento tĂŠrmico (53 ÂşC) sobre el crecimiento e incidencia de Colletotrichum gloeosporioides Penz en frutos de papaya var. âMaradolâ. Los resultados mostraron que la aplicaciĂłn de pyraclostrobin y thiabendazol (500, 250, 50 mg L-1) y azoxystrobin (500, 250 mg L-1) controlaron el crecimiento del hongo, mientras que trifloxystrobin (500, 250, 50 mg L-1) y azoxystrobin (50 mg L-1) fueron poco efectivos. En cuanto a la efectividad biolĂłgica, prochloraz (500 y 250 mg L-1) y pyraclostrobin (500 mg L-1) fueron los Ăşnicos fungicidas efectivos en el control de la enfermedad con niveles de 85.5, 92.7, 81.8%, respectivamente. El tratamiento hidrotĂŠrmico tuvo un control de la enfermedad de 57.8 %
Regional and seasonal patterns of litterfall in tropical South America
The production of aboveground soft tissue represents an important share of total net primary production in tropical rain forests. Here we draw from a large number of published and unpublished datasets (n=81 sites) to assess the determinants of litterfall variation across South American tropical forests. We show that across old-growth tropical rainforests, litterfall averages 8.61Âą1.91 Mg haâ1 yrâ1 (mean Âą standard deviation, in dry mass units). Secondary forests have a lower annual litterfall than old-growth tropical forests with a mean of 8.01Âą3.41 Mg haâ1 yrâ1. Annual litterfall shows no significant variation with total annual rainfall, either globally or within forest types. It does not vary consistently with soil type, except in the poorest soils (white sand soils), where litterfall is significantly lower than in other soil types (5.42Âą1.91 Mg haâ1 yrâ1). We also study the determinants of litterfall seasonality, and find that it does not depend on annual rainfall or on soil type. However, litterfall seasonality is significantly positively correlated with rainfall seasonality. Finally, we assess how much carbon is stored in reproductive organs relative to photosynthetic organs. Mean leaf fall is 5.74Âą1.83 Mg haâ1 yrâ1 (71% of total litterfall). Mean allocation into reproductive organs is 0.69Âą0.40 Mg haâ1 yrâ1 (9% of total litterfall). The investment into reproductive organs divided by leaf litterfall increases with soil fertility, suggesting that on poor soils, the allocation to photosynthetic organs is prioritized over that to reproduction. Finally, we discuss the ecological and biogeochemical implications of these result
Buenas prĂĄcticas de transferencia del conocimiento en la Universidad de CĂłrdoba
La iniciativa consiste en proporcionar la materia prima. El proyecto, que se ha realizado con cerdos y ha tenido una duraciĂłn de tres aĂąos, demuestra que la administraciĂłn de Cardiotrofina-1 en el transplante hepĂĄtico incrementa la supervivencia del animal, mejora su funciĂłn cardiaca, respiratoria y renal, y tambiĂŠn consigue reducir el daĂąo hepatocelecuar y el estrĂŠs oxidativo y nitrosativo en el injerto
Quantum walks: a comprehensive review
Quantum walks, the quantum mechanical counterpart of classical random walks,
is an advanced tool for building quantum algorithms that has been recently
shown to constitute a universal model of quantum computation. Quantum walks is
now a solid field of research of quantum computation full of exciting open
problems for physicists, computer scientists, mathematicians and engineers.
In this paper we review theoretical advances on the foundations of both
discrete- and continuous-time quantum walks, together with the role that
randomness plays in quantum walks, the connections between the mathematical
models of coined discrete quantum walks and continuous quantum walks, the
quantumness of quantum walks, a summary of papers published on discrete quantum
walks and entanglement as well as a succinct review of experimental proposals
and realizations of discrete-time quantum walks. Furthermore, we have reviewed
several algorithms based on both discrete- and continuous-time quantum walks as
well as a most important result: the computational universality of both
continuous- and discrete- time quantum walks.Comment: Paper accepted for publication in Quantum Information Processing
Journa
Synergistic effect of Si-hydroxyapatite coating and VEGF adsorption on Ti6Al4V-ELI scaffolds for bone regeneration in an osteoporotic bone environment.
The osteogenic and angiogenic responses to metal macroporous scaffolds coated with silicon substituted hydroxyapatite (SiHA) and decorated with vascular endothelial growth factor (VEGF) have been evaluated in vitro and in vivo. Ti6Al4V-ELI scaffolds were prepared by electron beam melting and subsequently coated with Ca10(PO4)5.6(SiO4)0.4(OH)1.6 following a dip coating method. In vitro studies demonstrated that SiHA stimulates the proliferation of MC3T3-E1 pre-osteoblastic cells, whereas the adsorption of VEGF stimulates the proliferation of EC2 mature endothelial cells. In vivo studies were carried out in an osteoporotic sheep model, evidencing that only the simultaneous presence of both components led to a significant increase of new tissue formation in osteoporotic bone.
STATEMENT OF SIGNIFICANCE
Reconstruction of bones after severe trauma or tumors extirpation is one of the most challenging tasks in the field of orthopedic surgery. This scenario is even more complicated in the case of osteoporotic patients, since their bone regeneration capability is decreased. In this work we present a porous implant that promotes bone regeneration even in osteoporotic bone. By coating the implant with an osteogenic bioceramics such as silicon substituted hydroxyapatite and subsequent adsorption of vascular endothelial growth factor, these implants stimulate the bone ingrowth when they are implanted in osteoporotic sheep
Recommendations for implementing lung cancer screening with low-dose computed tomography in Europe
Lung cancer screening (LCS) with low-dose computed tomography (LDCT) was
demonstrated in the National Lung Screening Trial (NLST) to reduce mortality from the disease.
European mortality data has recently become available from the Nelson randomised controlled
trial, which confirmed lung cancer mortality reductions by 26% in men and 39â61% in women.
Recent studies in Europe and the USA also showed positive results in screening workers exposed to
asbestos. All European experts attending the âInitiative for European Lung Screening (IELS)ââa
large international group of physicians and other experts concerned with lung cancerâagreed that
LDCT-LCS should be implemented in Europe. However, the economic impact of LDCT-LCS and
guidelines for its effective and safe implementation still need to be formulated. To this purpose, the
IELS was asked to prepare recommendations to implement LCS and examine outstanding issues.
A subgroup carried out a comprehensive literature review on LDCT-LCS and presented findings at
a meeting held in Milan in November 2018. The present recommendations reflect that consensus
was reached
Silicon substituted hydroxyapatite/VEGF scaffolds stimulate bone regeneration in osteoporotic sheep.
Silicon-substituted hydroxyapatite (SiHA) macroporous scaffolds have been prepared by robocasting. In order to optimize their bone regeneration properties, we have manufactured these scaffolds presenting different microstructures: nanocrystalline and crystalline. Moreover, their surfaces have been decorated with vascular endothelial growth factor (VEGF) to evaluate the potential coupling between vascularization and bone regeneration. In vitro cell culture tests evidence that nanocrystalline SiHA hinders pre-osteblast proliferation, whereas the presence of VEGF enhances the biological functions of both endothelial cells and pre-osteoblasts. The bone regeneration capability has been evaluated using an osteoporotic sheep model. In vivo observations strongly correlate with in vitro cell culture tests. Those scaffolds made of nanocrystalline SiHA were colonized by fibrous tissue, promoted inflammatory response and forested osteoclast recruitment. These observations discard nanocystalline SiHA as a suitable material for bone regeneration purposes. On the contrary, those scaffolds made of crystalline SiHA and decorated with VEGF exhibited bone regeneration properties, with high ossification degree, thicker trabeculae and higher presence of osteoblasts and blood vessels. Considering these results, macroporous scaffolds made of SiHA and decorated with VEGF are suitable bone grafts for regeneration purposes, even in adverse pathological scenarios such as osteoporosis
Marcadores moleculares derivados de sequĂŞncias expressas do genoma cafĂŠ potencialmente envolvidas na resistĂŞncia Ă ferrugem
Exploring the darkverse: a multi-perspective analysis of the negative societal impacts of the metaverse
The Metaverse has the potential to form the next pervasive computing archetype that can transform many aspects of work and life at a societal level. Despite the many forecasted benefits from the metaverse, its negative outcomes have remained relatively unexplored with the majority of views grounded on logical thoughts derived from prior data points linked with similar technologies, somewhat lacking academic and expert perspective. This study responds to the dark side perspectives through informed and multifaceted narratives provided by invited leading academics and experts from diverse disciplinary backgrounds. The metaverse dark side perspectives covered include: technological and consumer vulnerability, privacy, and diminished reality, humanâcomputer interface, identity theft, invasive advertising, misinformation, propaganda, phishing, financial crimes, terrorist activities, abuse, pornography, social inclusion, mental health, sexual harassment and metaverse-triggered unintended consequences. The paper concludes with a synthesis of common themes, formulating propositions, and presenting implications for practice and policy
Alignment of the CMS silicon tracker during commissioning with cosmic rays
This is the Pre-print version of the Article. The official published version of the Paper can be accessed from the link below - Copyright @ 2010 IOPThe CMS silicon tracker, consisting of 1440 silicon pixel and 15 148 silicon strip detector modules, has been aligned using more than three million cosmic ray charged particles, with additional information from optical surveys. The positions of the modules were determined with respect to cosmic ray trajectories to an average precision of 3â4 microns RMS in the barrel and 3â14 microns RMS in the endcap in the most sensitive coordinate. The results have been validated by several studies, including laser beam cross-checks, track fit self-consistency, track residuals in overlapping module regions, and track parameter resolution, and are compared with predictions obtained from simulation. Correlated systematic effects have been investigated. The track parameter resolutions obtained with this alignment are close to the design performance.This work is supported by FMSR (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ,
and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS
(Colombia); MSES (Croatia); RPF (Cyprus); Academy of Sciences and NICPB (Estonia);
Academy of Finland, ME, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG,
and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF (Korea); LAS (Lithuania); CINVESTAV, CONACYT,
SEP, and UASLP-FAI (Mexico); PAEC (Pakistan); SCSR (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MST and MAE (Russia); MSTDS (Serbia); MICINN and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); DOE and NSF (USA)
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