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Numerical study of a new constructive sequence for movable scaffolding system (MSS) application
Teran, Jose Ramon Diaz de,Haach, Vladimir Guilherme,Turmo, Jose,Jorquera, Juan Jose Techno-Press 2016 Advances in concrete construction Vol.4 No.3
This paper consists in a study of a new contructive sequence of road viaducts with Movable Scaffolding System (MSS) using numerical tools based on finite element method (FEM). Traditional and new sequences are being used in Spain to build viaducts with MSS. The new sequence permits an easier construction of one span per week but implies some other issues related to the need of two prestressing stages per span. In order to improve the efficiency of the new sequence by reducing the number of prestressing stages per span, two solutions are suggested in this study. Results show that the best solution is to introduce the 100% of the prestressing force at the self-supporting core in order to improve the road viaduct construction with movable scaffolding system by reducing execution time without increasing economic costs.
Persulfate based pretreatment to enhance the enzymatic digestibility of rice straw
Ahmed, M.A.,Seo, Y.H.,Teran-Hilares, R.,Rehman, M.S.U.R.,Han, J.I. Elsevier Applied Science 2016 Bioresource technology Vol.222 No.-
Oxidation induced by potassium persulfate was evaluated as an economic substitute for the Fenton-like reaction for the purpose of rice straw pretreatment in terms of temperature (80-140<SUP>o</SUP>C), potassium persulfate concentration (5-100mM) and process time (0.5-3h), an optimal pretreatment condition was identified: 120<SUP>o</SUP>C for 2 h with 75mM potassium persulfate concentration and yielded 91% enzymatic digestibility using 25.2FPU/g of biomass. Crystallinity index, SEM and SEM-EDS analyses revealed that biomass was indeed disrupted and components like silica were exposed. All this suggested that this persulfate-based pretreatment method, which is distinctively advantageous in terms of effectiveness and economics, can indeed be a competitive option.
Julián David Salazar-Gutiérrez,Andrés Castelblanco,María Ximena Rodríguez-Bocanegrab,Wilson Teran,Adriana Sáenz-Aponte 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.4
Entomopathogenic nematodes are key players for insect pest control and constitute an environmentally friendly alternative for crop protection. The insecticidal activity of the family Heterorhabditidae relies on a tight symbiotic relationship with enterobacteria of the genus Photorhabdus, where the bacterial contribution towards the death of the host has been highlighted. In the present work, we report the identification and pathogenic characterization of Photorhabdus luminescens strain SL0708, which is the natural symbiont of Heterorhabditis indica SL0708. We evaluated the pathogenicity of whole bacterial cells and acellular extracts against both Spodoptera frugiperda larvae and Galleria mellonella. Phylogenetic analyses using a polygenic sequencing approach assigned the bacterial strain to Photorhabdus luminescens subsp. akhurstii and bioassays showed it is highly pathogenic for both insects. After 48 h of treatment with 1× 103 −1 × 104 CFU/larva, 100% mortality was attained. Furthermore, when intra- or extracellular bacterial extracts were injected into G. mellonella, a cumulative percent mortality of 63% and 100% was respectively obtained after 72 h. In contrast, a 10% and 93% mortality was achieved for S. frugiperda with intra and extracellular extracts, respectively highlighting the role of extracellular factors in pathogenicity. We detected extracellular activities potentially accounting for the high pathogenicity observed and these included; proteases, esterases, ureases, hemolysins and siderophores. Interestingly, S. frugiperda was more susceptible to P. luminescens SL0708 cells than G. mellonella, which contrasted to its higher resistance to H. indica SL0708 nematodes, which suggests that EPN biological control potential should also be evaluated based on bacterial symbiont pathogenicity
Sergio I. Inclan-Alarcon,Santiago Riviello-Goya,Kevin Teran-De-la-Sancha,Oscar M. Fierro-Angulo,Aldo A. Acosta-Medina,Roberta Demichelis-Gomez,Christianne Bourlon 대한혈액학회 2022 Blood Research Vol.57 No.1
Background Acute lymphoblastic leukemia (ALL) is a malignant clonal bone marrow disorder with a high mortality rate during the initial therapy. This retrospective study aimed to describe and analyze the risk factors and causes of induction-related mortality (IRM) in an adolescent and adult ALL population treated in a low- and middle-income country. Methods From 2009 to 2016, a total of 167 patients were included, of which 50.9% were male with a median age of 28 years. B-immunophenotype represented 97.6%, and high-risk cytogenetics were present in 23.3%. During induction therapy, 91% had at least 1 complication, most of which were infectious, with an IRM of 12%. Results Factors associated with increased mortality rate were central nervous system (CNS) status [CNS-3: hazard ratio (HR) 3.029; 95% confidence interval (CI), 0.79‒11.49; P =0.103 and CNS-2: HR, 9.98; 95% CI, 2.65‒37.65; P =0.001] and dialysis requirement (HR, 9.15; 95% CI, 2.44‒34.34; P =0.001). Conclusion Our study confirms that ALL patients treated in resource-constrained settings have high rates of IRM, mainly attributed to advanced disease and high tumor burden at diagnosis.
Surgical Management of a Type II Extracranial Internal Carotid Aneurysm near to the Skull Base
Miguel A. Mendez-Sosa,Emmanuel Contreras-Jimenez,Javier E. Anaya-Ayala,Montserrat W. Miranda-Ramirez,Gabriel Lopez-Pena,Luis H. Arzola,Santiago Mier y Teran-Ellis,Hugo Laparra-Escareno,Carlos A. Hinoj 대한혈관외과학회 2021 Vascular Specialist International Vol.37 No.3
True aneurysmal disease in the carotid arteries is very uncommon, but individuals with this pathology face the grave risk of thromboembolism, which may consequently lead to cerebrovascular accidents. Clinical knowledge remains relatively limited owing to its rarity. We present the case of a 41-year-old obese female with a type II right extracranial internal carotid artery aneurysm incidentally found during imaging work-up. She underwent open surgical reconstruction with an autologous interposition graft from the common carotid artery to the internal carotid artery at the base level of the skull. Her postoperative period was uneventful, and the patient was discharged on postoperative day five with aspirin. At 12 months of follow-up, the patient remained symptom-free without complications.