Posgrados

Parent Organisation

Universidad UTE

Founding Date

October 2024

Country

City

Quito

Now showing 1 - 10 of 17

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Feasibility of aquaculture cultivation of elkhorn sea moss (Kappaphycus alvarezii) in a horizontal long line in the Tropical Eastern Pacific
(Springer Science and Business Media LLC, 2023-09-07)
Milton Montúfar-Romero
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Raúl E. Rincones-León
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Lorena Belén Cáceres-Farias
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María Mercedes Espinoza-Vera
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Ulises Avendaño
<jats:title>Abstract</jats:title><jats:p>Seaweed aquaculture has become a profitable and an attractive alternative of cultivation thanks to its quick biomass production for food, feed, and other non-food applications. In addition, the ecosystem services generated by seaweed cultivation towards carbon fixation represents a more sustainable solution to the ocean’s acidification. The growth of elkhorn sea moss (<jats:italic>Kappaphycus alvarezii</jats:italic>) was evaluated in three plots with 200 propagules during a period of 70 days in a floating raft system covered by a fishing net underneath. Initial weight of propagules was 159.3 ± 12.74 g in wet biomass and 15.3 ± 1.43 g in dry biomass and were sampled up to 19 days (in the lag growth phase; period I), up to 33 days (in the exponential growth phase; period II) and up to 70 days (in the stationarity growth phase; period III). The variations of sea surface water temperature, salinity, turbidity (Secchi depth), total ammonium, nitrites, nitrates, and phosphate were determined. The growth increase was more evident in the exponential phase II when a dry biomass of 28.0 ± 2.48 (1153.3 ± 6.25 g in wet mass) was reached, more than 7 times the biomass of propagules with an average daily growth rate of 15.2% g.day<jats:sup>–1</jats:sup>. The carrying capacity of the zone was estimated at 86.2% in the area where 53 cultivation units would be projected. The economic analysis presented a financial feasibility with a net profit of 19% over the projected income and an IRR of 16.5%, recovering the investment in an estimated period of 4.3 years. We recommend to continue with larger-scale studies to optimize the cultivation of <jats:italic>K. alvarezii</jats:italic> in the study area.</jats:p>
Scopus© Citations 15
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A newly isolated Scenedesmus bijugus PY6 for high-valued astaxanthin production via two-stage heterotrophic cultivation
(Elsevier BV, 2026-08)
Liu, Pingying
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Xiao, Xuehua
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Zhou, Youcai
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Guo, Xu
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Zhou, Dahui
Scopus© Citations 2
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Effects of different load weights on the work performance and physiological and hematobiochemical responses in working water buffalo
(Veterinary World, 2023-11)
Visoky Paján-Jiménez
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Fernando David Pazmiño-Rodríguez
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Patricia Roldán-Santiago
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Anna Dutro-Aceves
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Luis Alberto de la Cruz-Cruz
<jats:p>Background and Aim: Working animals are important in agriculture because they play a role in various agricultural activities, including milk and meat production. Thus, they contribute to the development of rural communities. In this study, we aimed to evaluate the effects of different load weights on the work performance and the physiological and hematological responses of working water buffalo (Bubalus bubalis). Materials and Methods: The work performances of 12 buffaloes (average weight 782.16 ± 21.62 kg) transporting 200, 350, and 500 kg of African palm fruits in metal baskets placed on their backs were evaluated. Work performance variables evaluated immediately after work were as follows: total number of trips (n), total weight (kg), distance traveled (km/day), working period (h), stopped time (h), and average speed (km/h). In addition, we evaluated physiological, biochemical, and hematological variables at three different times: before the start of work, immediately after work, and on the rest day. Results: Among the load weights, 500 kg (total load carried = 4,138.88 kg) improved work efficiency compared to 200 kg loads (total load = 3,322.22 kg) (p = 0.0281). However, 500 kg loads resulted in slower average speed (2.4 km, p = 0.0164), shorter working period (2.39 h, p < 0.0001) and distance traveled (7.29 km, p < 0.0001), and less total number of trips (8.27 trips, p < 0.0001) compared to 350 and 200 kg load weights (3.45 and 3.52 km/h, 2.55 and 2.79 h, 8.71 and 9.75 km, 10.94 and 16.61 trips, respectively); and the heaviest loads resulted in significantly higher (p < 0.005) respiratory rate, pulse, heart rate, rectal temperature, glucose, lactate dehydrogenase, creatine kinase, total protein, white blood cell count, neutrophils, lymphocytes, monocytes, eosinophils, and basophils. In contrast, was associated with lower levels of red blood cells, hemoglobin, and hematocrit compared to lower loads. All differences were more pronounced in 500 kg (p < 0.005) compared to 200 kg loads. Conclusion: Working buffaloes responded to work related to the transport of African palm fruits through various physiological, biochemical, and hematological changes. However, some variables remained close to the reference values reported in the literature for water buffaloes, and in general, all variables were reestablished during the rest day, indicating that these animals have adapted to working conditions. Keywords: biochemical responses, draught buffalo, hematological responses, physiological responses.</jats:p>
Scopus© Citations 3
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Work performance, physiological and hemato-biochemical responses in working buffalo with different load weights
(Universidad del Zulia, 2023-11-21)
Visoky Paján-Jiménez
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Fernando D. Pazmiño Rodríguez
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Patricia Roldán Santiago
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Cristian Larrondo Cornejo
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Anna Dutro Aceves
<jats:p>The objective of the present study was to evaluate the effect of the weight of different loads on work performance and physiological, biochemical, and hematological responses in working buffaloes. The study was carried out in the province of Esmeraldas, Cantón Quinindé, Ecuador. During the study, the area maintained an average temperature of 24.4 °C and a humidity of 91.7%. Twelve male working buffaloes 7 to 10 years old (782.16±21.62 kg) were evaluated while transporting African oil palm fruits in metal baskets placed on the back. The weights of the loads were 200, 300, and 500 kg. The work was carried out from 7:00 to 15:00 h. Buffaloes had five years of previous experience performing the same activities in the production unit. The animals always had access to water and natural shade from the African palm. Different variables related to work performance, physiological indicators, and biochemical and hematological responses were recorded 30 minutes before the start of work, immediately after work, and in the morning on the rest day, except for work performance variables, since it was measured immediately after work. All variables were compared with a mixed model for repeated measures, considering the factors time and load weight and Time x Load weight interactions as fixed effects, with the animal in each group as a random effect. The Tukey test with a probability level set at p<0.05 was used to make multiple comparisons. Results indicated that buffaloes that transported loads of 500, followed by 350 and 200 kg moved slower (3.40, 3.45, 3.52 km/h, p=0.0164), worked less time (2.39, 2.55, 2.79 h; p<0.0001), traveled less distance (7.29, 8.71, 9.75 km, p<0.0001) and made fewer trips (8.27, 10.94, 16.61, p<0.0001), respectively. However, the total weight of the load was greater (4,138.88, 3,830.55, 3,322.22 kg, p=0.0281), and they were stopped longer (5.59, 5.44, 5.20 h, p<0.0001), respectively. Physiological (respiratory rate, pulse, heart rate, and rectal temperature) and biochemical (glucose, lactate dehydrogenase, creatine kinase, and total protein) parameters, as well as blood cell count (white blood cell, neutrophils, lymphocytes, monocytes, eosinophils, and basophils), increased after work regardless of weight load (p<0.001). In contrast, red blood cell counts, hemoglobin, and hematocrit were decreased after work (p<0.001). Likewise, these changes were more pronounced when the load was 500 kg compared to 200 kg (p<0.05). However, all changes remained within the physiological ranges reported for the buffaloes. Therefore, it is concluded that heavier loads increase work efficiency but generate greater physiological and metabolic demand. Further studies are needed to understand the long-term effects on the welfare of working buffaloes destined for rural activities.</jats:p>
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Hereditary gingival fibromatosis: A Case Report.
(Facultad de Odontologia, Universidad de Concepcion, 2021-06-30)
Daysi Morocho-Monteros
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PARISE VASCO, JUAN MARCOS
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Danela Cisneros-Boada
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MANZANO FLORES, ELCIRA SABELA
<jats:p>Introduction: Hereditary gingival fibromatosis is a rare disorder with a genetic component that may appear during tooth replacement. This condition can cause functional and aesthetic pro-blems such as malocclusions, diastemas, pain when chewing, dental caries, periodontal disease, delayed eruption, among others. Objective: To report the multidisciplinary treatment provided to a patient with hereditary gingival fibromatosis. Case Report: This report describes the treatment carried out in a thirteen-year-old male patient presenting generalized increase in gingival volume associated with functional and aesthetic compromise and delayed eruption of permanent teeth. After diagnosis, a multidisciplinary intervention was proposed, involving perio-dontal and pediatric dentistry procedures, which improved the quality of life of the patient both functionally and aesthetically. Conclusion: Hereditary gingival fibromatosis not only affects the dental eruption process, but also causes aesthetic and emotional alterations in the patient. The periodontal procedures significantly im-proved the appearance, function, and the psychological state of the patient.</jats:p>
Scopus© Citations 1
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Memoria Hipogea. Reflexiones sobre la ciudad subterránea de Camerano
(Universidad de Navarra, 2024-10-14)
María Gilda Martino
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María Murillo Romero
El estudio del patrimonio construido subterráneo es esencial para el entendimiento de la realidad territorial de la región de Le Marche (Italia). La importancia del mismo se enfatiza a través del ejemplo de la ciudad subterránea de Camerano (Ancona), que representa el elemento clave para la comprensión de la memoria del lugar, constituyéndose como el reflejo de la forma urbana superficial y de la morfología de su medio físico. Este paisaje subterráneo de raíces milenarias, ha evolucionado en el tiempo desde lugar de refugio y de obtención de recursos hasta albergar usos religiosos, domésticos, de ocio y, finalmente, turísticoculturales. En esta investigación se plantea una reflexión crítica desde un enfoque metodológico multiescalar, siguiendo la disciplina paisajística, que permite un proceso de redescubrimiento patrimonial. Se destaca la capacidad actual de este paisaje, catalizador de significativa importancia para la identidad colectiva del lugar, de revelar y ocultar capas acumuladas, entrelazadas y perdidas a lo largo de su historia.
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Exploring zinc deficiency using serum Zn levels: consequences and potential solutions in suckling pigs
(Oxford University Press (OUP), 2023-11-30)
Laia Blavi
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VILLAGOMEZ ESTRADA, SANDRA DANIELA
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David Solà-Oriol
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José F Pérez
Three trials were undertaken to provide an answer to different questions: 1) Are suckling pigs able to maintain physiological serum Zn levels throughout lactation and do these levels vary between high and low body weight (BW) pigs?, 2) Are serum Zn levels in pigs soon after weaning a predisposing factor for diarrhea?, and 3) Is it possible to increase serum Zn levels at weaning by supplementing Zn during lactation. In trial 1, blood samples were taken from pigs during lactation. Eight pigs (one piglet per litter) had blood drawn on days 0 (farrowing), 7, 14, 21, and 28 (weaning), and 60 pigs (selected from the whole farrowing batch with 35 sows), categorized as either heavy (8.63 kg) or light (5.50 kg) had blood drawn on day 28. Serum Zn levels at birth were 1.2 mg/L and decreased (P &lt; 0.01) to 0.67 mg/L on day 28. Heavier pigs showed greater (P &lt; 0.01) serum Zn levels (0.98 mg/L) than light BW pigs (0.79 mg/L). In trial 2, blood samples were obtained from 240 pigs at weaning (26.2 ± 2.5 d) with an average initial BW of 6.94 ± 1.87 kg and were distributed into 24 pens (10 pigs/pen) by BW. Diarrhea incidence was recorded daily from days 0 to 35 post-weaning. From the 240 pigs, a group of 110 pigs with uniform BW (6.5 ± 1.9 kg) was selected and separated into two groups based on serum Zn levels at weaning with 55 pigs with low serum Zn (LZn: &lt;0.71 mg/L) and 55 pigs with high serum Zn (HZn: &gt;0.9 mg/L). Pigs with LZn were 2.49 times as likely to have diarrhea as pigs with HZn (P &lt; 0.02). In trial 3, a total of 96 suckling pigs were allotted four treatments that consisted of the daily administration of 0, 6, 18, or 30 mg of Zn as Zn citrate in capsule form during the last 7 d of lactation. Pigs were individually weighed, and blood samples were obtained on days 14, 21 (weaning), and 7 after weaning. Serum Zn levels linearly increased by day as Zn citrate supplementation increased (interaction, P &lt; 0.001). However, only light pigs supplemented with 18 and 30 mg/L of Zn experienced an increase in serum Zn levels during lactation. In conclusion, a decrease in serum Zn levels occurs during lactation and is more severe in low BW pigs. Low Zn status (&lt; 0.7 mg/L) at weaning may be a predisposing factor for diarrhea. However, Zn supplementation during lactation can mitigate this decrease in light pigs.
Scopus© Citations 4
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Specialized Feed-Additive Blends of Short- and Medium-Chain Fatty Acids Improve Sow and Pig Performance During Nursery and Post-Weaning Phase
(MDPI AG, 2024-12-20)
VILLAGOMEZ ESTRADA, SANDRA DANIELA
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MELO DURÁN, DIEGO ALEXANDER
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Sandra van Kuijk
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José F. Pérez
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David Solà-Oriol
The present study investigates the impact of supplementing diets with a synergistic blend of short- and medium-chain fatty acids (SCFAs-MCFAs) during the peripartum and lactation phases on early microbial colonization and the subsequent growth performance of newborn pigs. The experiment involved 72 sows and their litters, with a follow-up on 528 weaned pigs. Sows were fed either a control diet or a diet supplemented with SCFAs-MCFAs and the pigs were monitored for their growth performance and microbial populations. Subsequently, selected weaned pigs were allotted to an SCFAs-MCFAs diet according to the maternal diet. Results showed that SCFAs-MCFAs supplementation led to reduced backfat loss in sows and improved pig weight and uniformity at weaning (p < 0.05). Additionally, suckling pigs exhibited significant shifts in gut microbiota, including increased lactic acid bacteria and reduced Streptococcus suis populations (p < 0.05). Although there was no influence of maternal diet on pig growth after weaning, there was a modulation on bacterial populations at 7 and 35 days post-weaning. Pigs fed SCFAs-MCFAs demonstrated improved feed efficiency with notable reductions in E. coli and Streptococcus suis counts. The findings suggest that maternal dietary supplementation with SCFAs-MCFAs can positively influence both sow and pig performance, offering a potential strategy to enhance productivity and health in the commercial swine production.
Scopus© Citations 5
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Decarbonizing Composites: Policy‐Oriented Review of Carbon Footprint, Circularity, and Carbon Trading
(Wiley, 2026-07-14)
Lee, Chan Kok
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Lim, Hooi Ren
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Tang, Doris Ying Ying
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Show, Pau-Loke
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Chew, Kit Wayne
ABSTRACT
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Analysis of information security in the PoW (Proof of Work) and PoS (Proof of Stake)blockchain protocols as an alternative for handling confidential nformation in the public finance ecuadorian sector
(IEEE, 2021-06-23)
Silvana Abigail Yacchirema Chicaiza
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SAGUAY CHAFLA, CIRO NAPOLEON
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Ramiro Delgado Rodriguez
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Luis Fernando Enriquez Alvarez
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IÑIGUEZ MATUTE, POLO FABIAN
Scopus© Citations 6

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