29 results on '"Zamora, J."'
Search Results
2. Simulation of the RIBRAS Facility with GEANT4.
- Author
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Tamayose, L. E., Zamora, J. C., Fortino, G. F., and Flechas, D.
- Abstract
A Geant4 simulation code was developed to perform realistic simulations of the RIBRAS facility. A second-order expansion of a finite solenoid field was included to describe the beam optics with good precision. A systematic study of coil currents for several magnetic rigidities and focal points was performed. Parameterizations of the coil currents for single and dual mode operations were obtained. Dedicated routines were developed to simulate the mechanism of direct reactions involving two and three particles in the final state. The present simulations were employed to investigate the feasibility of a Solenoidal Spectrometer with the RIBRAS facility. Our first results indicate that the concept can be applied in the RIBRAS system under certain conditions. Forthcoming studies both from simulations and experiments are already under development. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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3. Axenic culture and biosynthesis of secondary compounds in lichen symbiotic fungi, the Parmeliaceae.
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Díaz, E. M., Zamora, J. C., Ruibal, C., Divakar, P. K., González-Benítez, N., Le Devehat, F., Chollet, M., Ferron, S., Sauvager, A., Boustie, J., Crespo, A., and Molina, M. C.
- Abstract
Lichens produce unique secondary metabolites with a rich potential as bioactive compounds. In many cases, the use of these molecules is limited by the low concentration of these compounds in thalli, low growth rate in culture, and changes in chemical patterns between thalli and aposymbiotic culture. In addition, the massive collection of some species of industrial interest can cause damage to lichen diversity and the associated environment. Six lichenized fungi (Arctoparmelia centrifuga, Parmelia saxatilis, Parmelina tiliacea, Platismatia glauca, Xanthoparmelia tinctina, and Usnea ghattensis) with biotechnological interest and belonging to Parmeliaceae have been cultured in order to test culture conditions and obtain enough biomass for further studies. In addition, we analyzed the compounds synthetized in axenic conditions and they were compared with chemosyndromes identified in complete thalli. Arctoparmelia centrifuga, P. saxatilis, P. tiliacea and X. tinctina were successfully cultivated while for P. glauca and U. ghattensis we only obtained sporulation and germination of the spores. The chemical pattern of the compounds secreted into the culture media varied significantly from the chemosyndrome of the whole thallus. Phenolic compounds of pharmacological and industrial interest (usnic acid, aspicilin, α-alectoronic acid, physodic acid, lobaric acid and nordivaricatic acid) and a wide variety of potentially bioactive compounds were obtained during the culture process. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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4. Stingray spear injury to the pediatric spinal cord: case report and review of the literature.
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Caceres, A., Shlobin, N. A., Lam, S., Zamora, J., and Segura, J. L.
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SPINAL cord injuries ,CENTRAL nervous system injuries ,STINGRAYS ,LITERATURE reviews ,EPIDURAL space ,ACUTE abdomen ,PRIAPISM - Abstract
Stingray injuries are rare, mostly causing injuries to the lower extremities but occasionally fatal if there is direct puncture of the thorax, abdomen, or neck. Direct combined stingray injury to the central nervous system has not been reported in the literature. Herein we present the case of a 12-year-old boy who, while wading at the seashore of the Costa Rica's Pacific Ocean, sustained a combined oblique penetrating injury to the C6 vertebra caused by a Stingray. He initially presented to the hospital with a complete asymmetric right C6/left T1 ASIA A examination, priapism, and loss of anal sphincter tone. Imaging revealed fracture of the posterior elements of C6 with an oblique trajectory into the left radicular foramen. T2W images did not reveal anatomical section but rather edema and minor bleeding in the epidural space. The patient underwent medical management and serial imaging. During the next 3 months, there was recovery of sensation on the right hemi body, bilateral paresthesias and asymmetric progressive improvement in strength on both legs. Acute care management and midterm term follow up are provided, along with a review of the literature for salient management considerations when evaluating and treating combined penetrating and envenomation injuries caused by stingrays. To our knowledge, this is the first report of such injury to the spine. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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5. Synergistic antidepressant-like effect of capsaicin and citalopram reduces the side effects of citalopram on anxiety and working memory in rats.
- Author
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Aguilar-Martinez, Irving S., Reyes-Mendez, Miriam E., Herrera-Zamora, J. Manuel, Osuna-Lopez, Fernando, Virgen-Ortiz, Adolfo, Mendoza-Munoz, Nestor, Gongora-Alfaro, Jose L., Moreno-Galindo, Eloy G., and Alamilla, Javier
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ANTIDEPRESSANTS ,DRUG side effects ,SHORT-term memory ,SPRAGUE Dawley rats ,RATS ,CITALOPRAM ,SEROTONIN uptake inhibitors ,ANXIETY - Abstract
Rationale: We have previously shown that in rats, capsaicin (Cap) has antidepressant-like properties when assessed using the forced swimming test (FST) and that a sub-threshold dose of amitriptyline potentiates the effects of Cap. However, synergistic antidepressant-like effects of the joint administration of Cap and the selective serotonin reuptake inhibitor citalopram (Cit) have not been reported. Objectives: To assess whether combined administration of Cap and Cit has synergistic effects in the FST and to determine whether this combination prevents the side effects of Cit. Methods: Cap, Cit, and the co-administration of both substances were evaluated in a modified version of the FST (30-cm water depth) conducted in rats, as well as in the open field test (OFT), elevated plus maze (EPM), and Morris water maze (MWM). Results: In line with previous studies, independent administration of Cap and Cit displayed antidepressant-like properties in the FST, while the combined injection had synergistic effects. In the OFT, neither treatment caused significant increments in locomotion. In the EPM, the time spent in the closed arms was lower in groups administered either only Cap or a combination of Cap and Cit than in groups treated with Cit alone. In the MWM, both Cap and the joint treatment (Cap and Cit) improved the working memory of rats in comparison with animals treated only with Cit. Conclusion: Combined administration of Cap and Cit produces a synergistic antidepressant-like effect in the FST and reduces the detrimental effects of Cit on anxiety and working memory. [ABSTRACT FROM AUTHOR]
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- 2020
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6. Genotoxicity in fishes environmentally exposed to As, Se, Hg, Pb, Cr and toxaphene in the lower Colorado River basin, at Mexicali valley, Baja California, México.
- Author
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Flores-Galván, M. A., Daesslé, L. W., Arellano-García, E., Torres-Bugarín, O., Macías-Zamora, J. V., and Ruiz-Campos, G.
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TOXAPHENE ,WATERSHEDS ,GENETIC toxicology ,FRESHWATER fishes ,FRESH water - Abstract
The environmental exposure to As, Se, Hg, Pb, Cr and toxaphene was assessed for 11 freshwater fish species in irrigation channels, agricultural return flow drains, a drain collecting lagoon and sections of the Colorado River at the Mexicali valley in Baja California, México, during August 2015–April 2016. Arsenic (2.90 ng ml
−1 ) and Se (1.41 ng ml−1 ) in water had the highest concentrations in the return flow drains (Hardy River and Xochimilco Lagoon, respectively). However, fish axial muscle tissue had the highest concentration of Se (8.3 µg g−1 ) and Hg (0.36 µg g−1 ) in Colorado River fresh water, while As (1.7 µg g−1 ) in Hardy River fish was highest. Selenium concentrations in all fishes and toxaphene in Cyprinus carpio and Ameiurus natalis are above the safe levels for human consumption (0.3 µg g−1 and 180 ng g−1 respectively). Toxaphene was detected in the fish axial tissue, having the highest concentrations in Poecilia latipinna (690 ng g−1 ) in the Colorado River. The low proportion of the 8-Cl toxaphene congeners in fish suggests degradation of this pollutant. Tilapia. sp. cf. zillii had the most genotoxic damage with 7.4 micronucleated erythrocytes per 10,000 erythrocytes in Xochimilco Lagoon and 2 in Hardy River. The genotoxicity in all the fish species studied was significantly correlated to the concentrations of As and Se in water. [ABSTRACT FROM AUTHOR]- Published
- 2020
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7. Bridging genomics and field research: draft genome sequence of Bacillus thuringiensis CR71, an endophytic bacterium that promotes plant growth and fruit yield in Cucumis sativus L.
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Flores, Aurora, Diaz-Zamora, J. Trinidad, Orozco-Mosqueda, Ma. del Carmen, Chávez, Ana, de los Santos-Villalobos, Sergio, Valencia-Cantero, Eduardo, and Santoyo, Gustavo
- Abstract
Here we report the draft genome sequence of bacterial strain CR71, consisting of a single chromosome with 5,914,775 base pairs (bp), 34.7% G + C content, and 5733 protein-coding genes. Phylogenetic analysis indicates that the CR71 strain is affiliated with Bacillus thuringiensis species, with an average nucleotide identity > 96% and genome to genome distance > 70%. The genome of B. thuringiensis strain CR71 contains genes potentially involved in a wide variety of both plant pathogen-antagonistic and plant-growth-promoting activities, such as biofilm production; acetoin, butanediol, and indoleacetic acid (IAA) synthesis; production of quorum-sensing molecules; synthesis of toxins and lytic enzymes; and promotion of tolerance to oxidative, metal, and salt stress. Additionally, antiSMASH analysis revealed a potential synthesis of siderophores and peptide antibiotics. To confirm the in silico data, strain CR71 was inoculated into cucumber plants (Cucumis sativus L.) in a field trial, in which we observed an increase in stem thickness, as well as shoot fresh weight and length. Importantly, compared to un-inoculated control plants, plants inoculated with strain CR71 increased the size/weight ratio of cucumber fruits (34.99%), biovolume index (16.8%), and total fruit yield (34.97%). In conclusion, genome analysis of strain CR71 confirmed multifactorial plant-beneficial mechanisms and the potential of CR71 as an agricultural bio-inoculant. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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8. Switching of Coercivity Process in MnBi Alloys.
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Zamora, J., Betancourt, I., and Figueroa, I. A.
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MANGANESE alloys , *BISMUTH , *COERCIVE fields (Electronics) , *PERMANENT magnets , *MAGNETIC anisotropy - Abstract
MnBi-based alloys represent an interesting choice for developing rare earth-free permanent magnets due to the high magnetocrystalline anisotropy of their characteristic low-temperature intermetallic phase (LTIP) with hexagonal structure. In this work, we discuss the switching of coercivity mechanism in MnBi alloys by modulation of their phase distribution and microstructure. As-cast MnBi alloys obtained by suction-casting technique exhibited LTIP interspersed within Bi- and Mn-rich areas. A noticeable coercivity field of 282 kA/m was observed. The coercivity mechanism for this alloy was explained in terms of the nucleation of reverse domains after saturation, by means of the Kronmüller equation, which incorporates the detrimental effect of microstructure defects through fitting parameters associated to reduced intrinsic magnetic properties at grain size boundaries, interfaces, and local demagnetizing fields. Subsequent annealing at 583 K for 24 h produced a marked reduction of coercivity (down to 16 kA/m), reflecting a switching of coercivity process from nucleation to pinning of domain walls. The key microstructural feature determining this variation is the formation/suppression of Bi-rich areas, which promotes the nucleation and growth of the initial MnBi intermetallic phase. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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9. Synthesis of BiOI photocatalyst by microwave method using EDTA as retarder of the reaction.
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Montoya-Zamora, J., Martínez-de la Cruz, A., and Cuéllar, E.
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PHOTOCATALYSTS , *BISMUTH compounds , *MICROWAVES , *ETHYLENEDIAMINETETRAACETIC acid , *CHEMICAL synthesis - Abstract
BiOI photocatalyst was successfully synthesized following a rapid synthesis by using microwave irradiation and EDTA as retarder of the reaction in aqueous medium. The effect of the amount of EDTA in the physical properties of BiOI such as specific surface area, morphology and photocatalytic activity was determined. The photocatalytic activity of BiOI samples was tested in the degradation reaction of rhodamine B in aqueous medium, and in the photo-oxidation reaction of nitric oxide in gaseous phase, in both cases under UV-Vis irradiation. The sample prepared with 40 % of EDTA at 110 °C exhibited the highest specific surface area of the system, and at the same time the highest photocatalytic activity in both photocatalytic reactions revealing the weight of this parameter in the process. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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10. Paramyxovirus Glycoproteins and the Membrane Fusion Process.
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Aguilar, Hector C., Henderson, Bryce A., Zamora, J. Lizbeth, and Johnston, Gunner P.
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- 2016
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11. Injective Colorings with Arithmetic Constraints.
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Astromujoff, N., Chapelle, M., Matamala, M., Todinca, I., and Zamora, J.
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INJECTIVE functions ,GRAPH coloring ,ARITHMETIC ,GEOMETRIC vertices ,MATHEMATICAL bounds ,POLYNOMIALS - Abstract
An injective coloring of a graph is a vertex labeling such that two vertices sharing a common neighbor get different labels. In this work we introduce and study what we call additive colorings. An injective coloring $$c:V(G)\rightarrow \mathbb {Z}$$ of a graph $$G$$ is an additive coloring if for every $$uv, vw$$ in $$E(G)$$ , $$c(u)+c(w)\ne 2c(v)$$ . The smallest integer $$k$$ such that an injective (resp. additive) coloring of a given graph $$G$$ exists with $$k$$ colors (resp. colors in $$\{1,\ldots ,k\}$$ ) is called the injective ( resp. additive) chromatic number ( resp. index). They are denoted by $$\chi _i(G)$$ and $$\chi '_a(G)$$ , respectively. In the first part of this work, we present several upper bounds for the additive chromatic index. On the one hand, we prove a super linear upper bound in terms of the injective chromatic number for arbitrary graphs, as well as a linear upper bound for bipartite graphs and trees. Complete graphs are extremal graphs for the super linear bound, while complete balanced bipartite graphs are extremal graphs for the linear bound. On the other hand, we prove a quadratic upper bound in terms of the maximum degree. In the second part, we study the computational complexity of computing $$\chi '_a(G)$$ . We prove that it can be computed in polynomial time for trees. We also prove that for bounded treewidth graphs, to decide whether $$\chi '_a(G)\le k$$ , for a fixed $$k$$ , can be done in polynomial time. On the other hand, we show that for cubic graphs it is NP-complete to decide whether $$\chi '_a(G)\le 4$$ . We also prove that for every $$\epsilon >0$$ there is a polynomial time approximation algorithm with approximation factor $$n^{1/3+\epsilon }$$ for $$\chi '_a(G)$$ , when restricted to split graphs. However, unless $$\mathsf P =\mathsf NP $$ , for every $$\epsilon >0$$ there is no polynomial time approximation algorithm with approximation factor $$n^{1/3-\epsilon }$$ for $$\chi '_a(G)$$ , even when restricted to split graphs. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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12. Work instability in rheumatoid arthritis patients from Argentina: prevalence and associated factors.
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Tamborenea, Maria, Pisoni, Cecilia, Toloza, Sergio, Mysler, Eduardo, Tate, Guillermo, Pereira, Dora, García Carrasco, M., Quintero, J., Cappuccio, A., Granel, A., Lazaro, M., Arturi, Pablo, Citera, Gustavo, Velazco Zamora, J., Saurit, Veronica, Alvarellos, A., Pons Estel, S., Danielsen, C., Graf, C., and Paira, Sergio
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RHEUMATOID arthritis risk factors ,DISABILITIES ,LOGISTIC regression analysis ,PHYSIOLOGY ,RHEUMATOID arthritis ,PATIENTS - Abstract
To determine the prevalence of and associated factors to work instability (WI) in rheumatoid arthritis (RA) Argentinean patients. Observational cross-sectional study that assessing employment status in currently working RA patients. They answered the validated version of RA work instability scale (RA-WIS). High-risk WI was considered when RA-WIS was ≥17. Factors associated with high-risk WI were examined by univariable and multivariable analysis. Four-hundred and fifty RA patients were enrolled; of these, 205 patients were currently employed, but only 172 have completed questionnaires required [RA-WIS and health assessment questionnaire (HAQ-A)]. Their mean age was 49.3 ± 10.8 years; 81.3 % were female; and their mean disease duration was 8.1 ± 7.2 years. Fifty-two percent of patients were doing manual work. The mean RA-WIS score was 11.4 ± 6.8, and 41 % of patients had a high-risk WI. High-risk WI was associated with radiographic erosions ( p < 0.001) and HAQ-A >0.87 ( p < 0.001) in the univariable analysis, whereas in the multivariable logistic regression analysis the variables associated with a high-risk WI were as follows: HAQ-A >0.87 [odds ratio (OR) 12.31; 95 % CI 5.38-28.18] and the presence of radiographic erosions (OR 4.848; 95 % CI 2.22-10.5). In this model, having a higher monthly income (OR 0.301; 95 % CI 0.096-0.943) and a better functional class (OR 0.151; 95 % CI 0.036-0.632) were protective. Forty-one percent of RA working patients had high-risk WI. The predictors of high RA-WIS were HAQ-A ≥0.87 and radiographic erosions, whereas having a better functional class and have higher incomes were protective. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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13. Sinus bradycardia induced by darunavir-ritonavir in a patient with acquired immunodeficiency syndrome.
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Gonzales Zamora, J. and Espinoza, L.
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ANTIVIRAL agents ,BRADYCARDIA ,ELECTROCARDIOGRAPHY ,HIV-positive persons ,PROTEASE inhibitors ,HIGHLY active antiretroviral therapy ,LOPINAVIR-ritonavir ,PHARMACODYNAMICS - Published
- 2017
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14. On the effects of the dispersant Corexit 9500 during the degradation process of n-alkanes and PAHs in marine sediments.
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Macías-Zamora, J., Meléndez-Sánchez, A., Ramírez-Álvarez, N., Gutiérrez-Galindo, E., and Orozco-Borbón, M.
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MARINE sediment analysis ,ENVIRONMENTAL degradation ,POLYCYCLIC aromatic hydrocarbons ,ALKANES ,OIL spills ,TOXICITY testing - Abstract
In many coastal countries, oil spill contingency plans include several alternatives for removal of the spilled oil from the ocean. Frequently, these plans include dispersants. Because this process applies chemical substances that may add toxicity to oil that already contains toxic compounds, it is, at times, a controversial method to fight oil pollution. Additionally, local conditions may result in particular complications. We investigated the possible effects of the dispersant Corexit 9500© under conditions similar to those of subtropical oceans. We used fuel oil #6+ diesel as the test mixture. Under certain conditions, at least part of the dispersed oil may reach the sediment, particularly if the dispersant is applied in coastal waters. Nine experimental units were used in this experiment. Similar conditions of water temperature, salinity, air fluxes into the experimental units, and hydrocarbon concentrations in sediments were used. Two treatments and one control, each one with three replicates, were carried out. We concentrated our investigation on sediment, although measurements of water were also taken. Our results suggest that once the oil has penetrated the sediment, no significant differences exist between oil that contains dispersant and oil without dispersant. Noticeable degradation of aliphatic hydrocarbons occurred mainly in the low molecular weight aliphatic hydrocarbons and not in the others. Apparently, degradation of aromatics was easier than that of alkanes. However, some differences were noticed for the degradation of PAHs in the sediment, suggesting a faster degradation under particular conditions in aerobic environments such as under this experiment. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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15. Nowhere-Zero 5-Flows and Even (1,2)-Factors.
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Matamala, M. and Zamora, J.
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EXISTENCE theorems , *INTEGERS , *SUBGRAPHS , *SET theory , *NUMBER theory , *PATHS & cycles in graph theory , *MATHEMATICAL analysis - Abstract
A graph G = ( V, E) admits a nowhere-zero k-flow if there exists an orientation H = ( V, A) of G and an integer flow $${\varphi:A \to \mathbb{Z}}$$ such that for all $${a \in A, 0 < |\varphi(a)| < k}$$. Tutte conjectured that every bridgeless graphs admits a nowhere-zero 5-flow. A (1,2)-factor of G is a set $${F \subseteq E}$$ such that the degree of any vertex v in the subgraph induced by F is 1 or 2. Let us call an edge of G, F- balanced if either it belongs to F or both its ends have the same degree in F. Call a cycle of G F- even if it has an even number of F-balanced edges. A (1,2)-factor F of G is even if each cycle of G is F-even. The main result of the paper is that a cubic graph G admits a nowhere-zero 5-flow if and only if G has an even (1,2)-factor. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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16. Accuracy of CT angiography in the diagnosis of acute gastrointestinal bleeding: systematic review and meta-analysis.
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García-Blázquez, V, Vicente-Bártulos, A, Olavarria-Delgado, A, Plana, M N, van der Winden, D, Zamora, J, and EBM-Connect Collaboration
- Abstract
Objective: To assess the diagnostic accuracy of computed tomography (CT) angiography in the evaluation of patients with an episode of acute gastrointestinal haemorrhage.Methods: Systematic review and meta-analysis to estimate pooled accuracy indices. A bivariate random effects model was adjusted to obtain a summary receiver-operating characteristic (sROC) curve and the corresponding area under the curve (AUC).Results: Twenty-two studies were included and provided data on 672 patients (range of age 5-74) with a mean age of 65 years. The overall sensitivity of CT angiography for detecting active acute GI haemorrhage was 85.2 % (95 % CI 75.5 % to 91.5 %). The overall specificity of CT angiography was 92.1 % (95 % CI 76.7 % to 97.7 %). The likelihood ratios for positive and negative test results were 10.8 (95 % CI 3.4 to 34.4) and 0.16 (95 % CI 0.1 to 0.27) respectively, with an AUC of 0.935 (95 % CI 0.693 to 0.989). The sources of heterogeneity explored had no significant impact on diagnostic performance.Conclusions: CT shows high diagnostic accuracy and is an excellent diagnostic tool for detection and localising of intestinal bleeding sites. It is highly available, provides fast detection and localisation of the bleeding site, and is minimally invasive.Key Points: • CT angiography is increasingly used for investigating severe gastrointestinal bleeding. • This systematic review and meta-analysis updates previous ones. • In patients with massive gastrointestinal bleeding, CT angiography/MDCT detects bleeding accurately. • CT angiography is useful in locating the bleeding site and determining appropriate treatment. [ABSTRACT FROM AUTHOR]- Published
- 2013
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17. Magnetic resonance imaging in the preoperative assessment of patients with primary breast cancer: systematic review of diagnostic accuracy and meta-analysis.
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Plana MN, Carreira C, Muriel A, Chiva M, Abraira V, Emparanza JI, Bonfill X, Zamora J, Plana, María Nieves, Carreira, Carmen, Muriel, Alfonso, Chiva, Miguel, Abraira, Víctor, Emparanza, Jose Ignacio, Bonfill, Xavier, and Zamora, Javier
- Abstract
Objectives: To estimate the diagnostic accuracy of magnetic resonance imaging (MRI) in detecting additional lesions and contralateral cancer not identified using conventional imaging in primary breast cancer.Methods: We have conducted a systematic review and meta-analyses to estimate diagnostic accuracy indices and the impact of MRI on surgical management.Results: Fifty articles were included (n = 10,811 women). MRI detected additional disease in 20% of women and in the contralateral breast in 5.5%. The summary PPV of ipsilateral additional disease was 67% (95% CI 59-74%). For contralateral breast, the PPV was 37% (95% CI 27-47%). For ipsilateral lesions, MRI devices ≥1.5 Tesla (T) had higher PPV (75%, 95% CI 64-83%) than MRI with <1.5 T (59%, 95% CI 53-71%). Similar results were found for contralateral cancer, PPV 40% (95% CI 29-53%) and 19% (95% CI 8-39%) for high- and low-field equipments, respectively. True positive MRI findings prompted conversion from wide local excision (WLE) to more extensive surgery in 12.8% of women while in 6.3% this conversion was inappropriate.Conclusions: MRI shows high diagnostic accuracy, but MRI findings should be pathologically verified because of the high FP rate. Future research on this emerging technology should focus on patient outcome as the primary end-point. [ABSTRACT FROM AUTHOR]- Published
- 2012
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18. Population studies of arthropods on Melia azedarach in Seville (Spain), with special reference to Eutetranychus orientalis (Acari: Tetranychidae) and its natural enemies.
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González-Zamora, J., López, C., and Avilla, C.
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ARTHROPODA ,MELIA ,SPIDER mites ,DEFOLIATION ,PHYTOSEIIDAE - Abstract
Eutetranychus orientalis has become an important pest of the ornamental tree Melia azedarach in the city of Seville (Spain). Trees suffer total defoliation at the end of summer. Studies were conducted in a regular plantation of this tree in the Miraflores Park in 2008 and 2009, to determine the arthropod faunal composition, with particular interest in the possible natural enemies of E. orientalis. Eutetranychus orientalis accounted for 98.3% of the arthropods found on the leaflets. Two species of phytoseiids were found, Euseius scutalis and Euseius stipulatus, but they only represented 0.2% of the arthropods. The most abundant insect was the predator thrips Scolothrips longicornis, which accounted for 0.9% of the arthropods found. The population of E. orientalis reached two peaks in 2008, with 325 individuals per leaflet in August, and 100 individuals per leaflet in November. Scolothrips longicornis densities closely followed E. orientalis, and predation was observed on various mite instars. Phytoseiids did not show such a response to the E. orientalis densities. Eutetranychus orientalis was more abundant in the exterior part of the plantation. No differences of arthropod densities were found between the various orientations in the plantation (north vs. south, east vs. west), although E. orientalis densities were different between rows. Distribution of E. orientalis population was highly aggregative, that of S. longicornis population was less aggregative, whereas the phytoseiid population showed a random distribution. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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19. Model selection and averaging in the estimation of population parameters of Bemisia tabaci (Gennadius) from stage frequency data in sweet pepper plants.
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González-Zamora, J. and Moreno, R.
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INSECT population estimates , *PARAMETERS (Statistics) , *AVERAGING method (Differential equations) , *SWEETPOTATO whitefly , *SWEET peppers , *PARASITOIDS , *SURVIVAL analysis (Biometry) - Abstract
Bemisia tabaci is a significant pest for many crops, but there are few population studies of this insect on sweet pepper ( Capsicum annuum). In this study, stage frequency data were generated with B. tabaci in sweet pepper plants in various situations, and the Bellows and Birley method was used to obtain population parameters from the data. The Akaike Information Criterion (AIC) was used to select the best option of the Bellows and Birley method and, in some cases, to estimate the parameters of the population using model averaging. The ratios estimated/observed for each population parameter were calculated to assess bias and were used to correct the estimations if the ratios were different from 1. The effects of different factors on the estimations of population parameters were analysed. The total duration of development was affected by the experimental conditions (laboratory vs. greenhouse) and temperature, but it had the highest precision. The final survival rate was affected by temperature, and the estimation of individuals entering each stage was affected only by the options included in the Bellows and Birley method. AIC helped to detect differences in the daily survival rate among the different experiments between N1 (first instar) (range 0.842-0.923), and the egg (range 0.989-1.0) and N4 (fourth instar) (0.990). The methodology used can be employed in field population studies. For example, the final survival rate in the greenhouse experiments varied between 0.624 and 0.097, depending on if the parasitoids were present or not, and the total development varied between 420.6 and 440.7 degree days. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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20. Trace Metals in Sediments and Zostera marina of San Ignacio and Ojo de Liebre Lagoons in the Central Pacific Coast of Baja California, Mexico.
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Macías-Zamora, J. V., Sánchez-Osorio, J. L., Ríos-Mendoza, L. M., Ramírez-Álvarez, N., Huerta-Díaz, M. A., and López-Sánchez, D.
- Subjects
TRACE metals ,SEDIMENTS ,ZOSTERA marina ,LAGOONS - Abstract
San Ignacio and Ojo de Liebre lagoons in central Baja California, Mexico are nursery and grazing grounds for whales and turtles. Ojo de Liebre Lagoon also supports a salt mine operation. By concentrating trace metals via evaporation, this activity might harm biota. Consequently, salt mining might be incompatible with the lagoon’s ecological role. Eelgrass can incorporate these elements and reroute them to other organisms. Trace metals in sediments (Cd, Co, Cu, Mn, Ni, Pb, Zn, and Fe) were measured at both lagoons. Some (Cu, Mn, Pb, and Zn) were also measured in Zostera marina patches at both lagoons. The results did not show elevated metal concentration at any lagoon, either for sediments or eelgrass. No statistically significant differences between lagoons were found. However, eelgrass at both lagoons showed larger concentration ranges than in sediments. Also, a correlation exists between sediment metal concentration and its concentration in eelgrass. Surprisingly, several sediment metal concentrations are higher than those considered as elevated for the Southern California Bight. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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21. Distribution of Mercury in Surficial Sediments from Todos Santos Bay, Baja California, México.
- Author
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Gutiérrez-Galindo, E., Casas-Beltrán, D., Muñoz-Barbosa, A., Daesslé, L., Segovia-Zavala, J., Macías-Zamora, J., and Orozco-Borbón, M.
- Subjects
MERCURY & the environment ,HEAVY metal content of sediments ,SPATIAL arrangement - Abstract
During 2004 the spatial distribution of total Hg in sediments from Todos Santos Bay, Baja California, México was studied to evaluate the degree of environmental impact in this bay. The results showed low concentrations and no Hg enrichment at any site. These findings suggest natural levels of Hg in the water of Todos Santos Bay. The regional distribution of Hg/Fe shows lower values in the East and higher in the West of the bay. No significant correlations ( p < 0.05) were found between Hg and organic matter or particle size, suggesting that the distribution of Hg is not controlled by these variables. [ABSTRACT FROM AUTHOR]
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- 2008
- Full Text
- View/download PDF
22. Polydispersity effects in the dynamics and stability of bubbling flows.
- Author
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Salinas-Rodríguez, E., Rodríguez, R. F., Zamora, J. M., and Soria, A.
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BUBBLES ,KINEMATICS ,SPEED ,ENGINEERING systems ,ENGINEERING - Abstract
The occurrence of swarms of small bubbles in a variety of industrial systems enhances their performance. However, the effects that size polydispersity may produce on the stability of kinematic waves, the gain factor, mean bubble velocity, kinematic and dynamic wave velocities is, to our knowledge, not yet well established. We generalize the model by Biesheuvel and Gorissen [10] to incorporate size polydispersity of bubbles. We find that it enhances the stability of a bubble column by a factor of about $23\%$ as a function of frequency. In this way our model predicts effects that might be verified experimentally; however, this remain to be assessed. Our results reinforce the point of view advocated in this work in the sense that a description of a bubble column based on the concept of randomness of a bubble cloud and average properties of the fluid motion, may be a useful approach that has not been exploited in engineering systems. [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
23. Gastric adenocarcinoma. Our experience with radical lymphadenectomy.
- Author
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Trill, J., Sanjuanbenito, A., Fernández-Bobadilla, L., Losa, N., Lobo, E., Muriel, A., Zamora, J., and Martínez-Molina, E.
- Abstract
Copyright of Clinical & Translational Oncology is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2003
- Full Text
- View/download PDF
24. Both morphological and molecular characters support speciation of South American siskins by sexual selection.
- Author
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Van den Elzen, R., Guillén, J., Ruiz-del-Valle, V., Allende, L. M., Lowy, E., Zamora, J., and Arnaiz-Villena, A.
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SPECIES ,CARDUELIS ,BIOLOGICAL evolution ,AMINO acids - Abstract
South American siskin radiation was studied by both mitochondrial cytochrome b (mt cyt b) DNA sequencing and homologous phenotypic characters; the latter were coded separately according to sex. Mixed phenetic and molecular (total evidence) dendrograms were constructed and the corresponding analyses suggest that speciation started in the South American siskin group with a north to south separation (Carduelis notata/C. barbata) along the Andean spine. A second split may have taken place around the Peruvian Andean mountains, corresponding to the present distribution pattern of C. olivacea. The most recent speciation events seem to have occurred in three sister species pairs: (i) C. xanthogastra/C. atrata, (ii) C. magellanica/C. yarrellii, (iii) C. cucullata/C. crassirostris. Accumulation of consistent characters in both morphological and molecular data at the basal nodes of the dendrograms indicate that speciation events occurred within a short period of time. Our data also suggest that speciation probably occurred by sexual selection through female mating choice in this radiation. Additionally, studies of variable amino acid residues in the mt cyt b molecule show that the three variable amino acids found are placed in the mitochondrial transmembrane region, which is also part of the hypervariable region in mammals. Each of the three amino acid changes occur in each of the three postulated evolutionary groups. [ABSTRACT FROM AUTHOR]
- Published
- 2001
- Full Text
- View/download PDF
25. Phylogeography of crossbills, bullfinches, grosbeaks, and rosefinches.
- Author
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Arnaiz-Villena, A., Guillén, J., Ruiz-del-Valle, V., Lowy, E., Zamora, J., Varela, P., Stefani, D., and Allende, L. M.
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CROSSBILLS ,GROSBEAKS ,FINCHES ,CANARIES ,PHYLOGEOGRAPHY - Abstract
: Mitochondrial cytochrome b (cyt b) from 24 Carduelini species including crossbills, bullfinches, grosbeaks, rosefinches, and other related, but not conclusively classified species, was sequenced. These sequences were also compared with all the available sequences from the genera Carduelis, Serinus, and Passer. Phylogenetic analyses consistently gave the same groups of finches and the calculated divergence times suggest that speciation of the studied species occurred between 14 and 3 million years ago (Miocene-Pliocene), appearing before the Passer, Carduelis, and Serinus genera. Pleistocene glaciations may have been important in subspeciation. Crossbills are integrated within the genus Carduelis, and within redpolls; the common crossbill shows subspeciation with Loxia japonica in the Pleistocene epoch. Pinicola enucleator groups together with bullfinches and is probably the ancestor of the group. Hawfinch is only distantly related to the studied groups, and might either represent an isolated genus or be related to the New World genus Hesperiphona. The grosbeak genera Eophona and Mycerobas are clearly sister groups, and species belonging to the former might have given rise to Mycerobas species. The isolated (in classification) Uragus sibiricus and Haematospiza sipahi are included within the genus Carpodacus (rosefinches); Carpodacus nipalensis is outside the genus Carpodacus in the molecular analyses and might be an isolated species or related to the genus Montifringilla. [ABSTRACT FROM AUTHOR]
- Published
- 2001
- Full Text
- View/download PDF
26. Haemodynamic consequences and uterine contractions following 0.5 or 1.0 litre crystalloid infusion before obstetric epidural analgesia.
- Author
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Zamora, Jorge, Rosaeg, Ola, Lindsay, M., Crossan, Mary, Zamora, J E, Rosaeg, O P, Lindsay, M P, and Crossan, M L
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HYPOTENSION ,CLINICAL trials ,COMPARATIVE studies ,HEMODYNAMICS ,LONGITUDINAL method ,RESEARCH methodology ,MEDICAL cooperation ,PHYSIOLOGIC salines ,RESEARCH ,UTERINE contraction ,EVALUATION research ,RANDOMIZED controlled trials ,EPIDURAL analgesia ,OBSTETRICAL analgesia ,FETAL heart rate ,PREVENTION - Abstract
Copyright of Canadian Journal of Anaesthesia / Journal Canadien d'Anesthésie is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 1996
- Full Text
- View/download PDF
27. Effect of the bioflavonoid morin on HEp-2 cells.
- Author
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Pond, A., Zamora, J., and Wells, M.
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MORIN ,CELL culture ,BIOFLAVONOIDS ,ENZYME metabolism ,CELL growth ,PREVENTION - Abstract
The article presents a study on Human Epidermoid #2 (HEp-2) cells treated with the bioflavonoid morin (2',3,4',5,7-pentahydroxyflavone or 2-(2,4-dihydroxyphenyl)-3,5,7- trihydroxy-4H-l-benzopyran-4-one). It states that HEp-2 cells has the ability to metabolize the bioflavonoid through microsomal enzymes. It suggests that morin with lower than 0.5 millimolar (mM) can be used to inhibit the growth of HEp-2 cells without affecting cell population.
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- 1994
- Full Text
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28. Correction to: Stingray spear injury to the pediatric spinal cord: case report and review of the literature.
- Author
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Caceres, A., Shlobin, N. A., Lam, S., Zamora, J., and Segura, J. L.
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SPINAL cord injuries ,LITERATURE reviews ,STINGRAYS ,SPELLING errors ,AUTHORSHIP collaboration - Abstract
The original version of this article unfortunately contained an error in the spelling of the last name of one of the co-authors. The corresponding author did not notice that the last name of one of the co-authors, Nathan Shlobin, was misspelled as "Schlobin". The correct spelling of his last name is "Shlobin". Given in this article is the corrected author name. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
29. Spanish adaptation of the Quality of Life Index-Spinal Cord Injury version
- Author
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Fisioterapia, Seco Calvo, Jesús Ángel, Kovacs, Francisco, Barriga, A, Sáez-Royuela Gonzalo, María, Zamora, J, Fisioterapia, Seco Calvo, Jesús Ángel, Kovacs, Francisco, Barriga, A, Sáez-Royuela Gonzalo, María, and Zamora, J
- Abstract
[EN] Study design: A cross-sectional, validation study. Objectives: To (a) develop the Spanish version of the Quality of Life Index-Spinal Cord Injury version (SV-QLI/SCI) and (b) assess its psychometric characteristics among permanent wheelchair users and specifically among those with SCI. Setting: Associations of wheelchair users in Mallorca (Spain). Methods: Two forward and backward translations of the QLI/SCI into Spanish were carried out separately. Seventy-seven subjects were randomly selected among the members of the associations. They completed the SV-QLI/SCI and validated instruments to measure depression and spinal pain upon recruitment and 14 days later. Assessments included comprehensibility, reproducibility, floor and ceiling effects and correlations between quality of life, pain and depression (Spearman's correlation coefficient). Analyses were repeated excluding data from subjects without SCI. Results: Three items of the SV-QLI/SCI required rephrasing. Reproducibility was ‘almost perfect’ for the entire questionnaire and its ‘Health and functioning’ subscale, ‘substantial’ for the ‘Social and economic’ and ‘Family’ subscales and ‘moderate’ for the ‘Psychological/spiritual’ subscale. Floor effect was not observed, and only for the ‘Family’ subscale >3% of the subjects reached the maximum possible score. The correlation between quality of life and depression was the strongest (r=−0.628). Results were virtually identical in the subsample with SCI. Conclusion: These results support the use of the SV-QLI/SCI among Spanish-speaking wheelchair users.
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