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Now showing items 4056-4075 of 13352
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Effect of inorganic salts and matrix crosslinking on the dose response of polymer gel dosimeters based on acrylamide
(Elsevier Ltd, 2018-07-17)The use of additives in polymer gel dosimeters to enhance their sensitivity or to improve their performance is of great importance for their application in radiomedicine. Inorganic salts have been used as additives with ... -
Effect of management and host factors on seroprevalence of bovine anaplasmosis and babesiosis in Costa Rica
(Elsevier B.V, 1993-11-16)The relationships between the seroprevalences of Anaplasma rnarginale, Babesia bige mina, Babesia bovis and some selected factors were assessed. Factors studied were age, breed, herd size, farm size, rotational grazing ... -
Effect of metal concentration on growth and luminescence of luminous bacteria straims isolated from golfo de Nicoya, Costa Rica
(Universidad Nacional (Costa Rica), 2021-01)Luminescence in bacteria is catalyzed by luciferase. When these microorganisms are exposed to toxic substances, the bioluminescent enzyme system can be inhibited. The objective of this study was to analyze the potential ... -
Effect of neosporosis on productive and reproductive performance of dairy cattle in Costa Rica
(Elsevier B.V, 2005-12)A cross-sectional study was conducted to assess the effect of neosporosis on productive and reproductive parameters in dairy cows. Cows (n = 2743) from 94 farms located in the most important dairy areas in Costa Rica were ... -
Effect of organic nitrogen and carbon mineralization on sediment organic matter accumulation in fish ponds
(Aquaculture Research, 2005-07-01)In aquaculture, ponds with high loads of organic inputs, organic matter accumulates at the bottom over time. Uneaten feed, senescent phytoplankton and faeces are the principal sources of accumulated material, but quanti¢cations ... -
Effect of prey availability on the abundance of White-breasted Wood-Wrens, insectivorous birds of tropical lowland forests
(Universidad Nacional, Costa Rica., 2014)Some understory insectivorous birds manage to persist in tropical forest fragments despite significant habitat loss and forest fragmentation. Their persistence has been related to arthropod biomass. In addition, forest ... -
Effect of ruminally protected Methionine on the productive and reproductive performance of grazing Bos indicus heifers raised in the humid tropics of Costa Rica
(Springer Science + Business Media B.V., 2008-03-11)With the objective of evaluating the effect of methionine supplementation prior to a breeding program, thirty one heifers (Bos taurus x Bos indicus) were used averaging 386 ± 29 days of age and a mean body weight of ... -
Effect of School-Based Physical Activity on Health Fitness in Children
(Human Kinetics, 2018-10)A total of 227 children (116 men and 111 women), age = 8.8 ± 1.8 years, height = 1.35 ± 0.12 m, weight = 32.8 ± 9.5 kg, BMI = 17.8 ± 2.9 kg/m2, waist circumference (WC) = 63.5 ± 9.2 cm, systolic blood pressure (SBP) = 100 ... -
Effect of the soft segment on the fatigue behavior of segmented polyurethanes
(Elsevier, 2000)Effect of the soft-segment structure and molecular weight on the microphase separation in segmented polyurethanes (SPU) was determined by means of differential scanning calorimetry, small-angle X-ray scattering, dielectric ... -
Effect of the use of probiotic Bacillus subtilis (QST 713) as a growth promoter in broilers: an alternative to bacitracin methylene disalicylate
(Elsevier Inc. on behalf of Poultry Science Association Inc, 2021-06-29)The global poultry trend toward the more responsible use of antibiotics is becoming recurrent and has demanded the need to generate new natural alternatives. Probiotics have gained importance as an option to use as growth ... -
Effect of the veterinary ionophore monensin on the structure and activity of a tropical soil bacterial community
(Taylor and Francis Inc., 2019-10-07)Monensin (MON) is a coccidiostat used as a growth promoter that can reach the environment through fertilization with manure from farm animals. To verify whether field-relevant concentrations of this drug negatively ... -
Effect of two cytokinins and a growth inhibitor on the in vitro tuberization of two genotypes of Solanum tuberosum L. cvs. Atlantic and Alpha
(Universidad Nacional (Costa Rica), 2019-07-31)This investigation was carried out to evaluate the effect of two cytokinins: 6-benzilaminopurine (BAP) (6.5 mg l-1) and kinetin (K) (2.5 mg l-1), as well as the growth inhibitor abscisic acid (ABA) (1.0 mg l-1) on the in ... -
Effective speaking techniques
(III Congreso Internacional de Lingüística Aplicada, 2011)El objetivo de este proyecto es que el aprendiente de una segunda lengua desarrolle habilidades de comunicación oral en su proceso de aprendizaje. Además, se pretende demostrar que los profesores pueden formar comunicadores ... -
Effectiveness of N-waves for predicting morphological changes due to tsunamis
(Elsevier, 2018)The research on morphological changes caused by tsunamis has increased considerably in the last few years, yet the processes behind this phenomenon are still not fully understood. This paper analyzes and compares numerical ... -
Effects of androgenic gland ablation on growth, sexual characters and spermatogenesis of the white shrimp, Litopenaeus vannamei (Decapoda: Penaeidae) males
(Aquaculture Research Vol.47 No.9 2768-2777, 2015-03-10)This research was implemented to study the effects of androgenic gland ablation in the white shrimp Litopenaeus vannamei to explore sex reversal potential as an alternative technology for monosex female mariculture based ... -
Effects of Autologous Conditioned Plasma® (ACP) on the healing of surgically induced core lesions in equine superficial digital flexor tendon
(WordPress, 2014-11)Tendon pathologies are among the most common musculoskeletal disorders in horses. After damage the tendon repairs by forming disorganized scar tissue that is of inferior functional quality than normal tendon, leading ... -
Effects of group work on the oral interaction of students enrolled in the course english integrated skills I (speaking/listening/reading) of the associate’s degree in english at Universidad Nacional, Brunca extension, Pérez Zeledón Campus: a case study
(Universidad Nacional, Costa Rica, 2016)This is a qualitative study aimed at researching the effects of group-work activities (GWAs) on the oral interaction of the students enrolled in the course English Integrated Skills I of the Associate’s Degree in English ... -
Effects of local and regional climatic fluctuations on dengue outbreaks in southern Taiwan
(PLOS ONE, 2017-06-02)Background: Southern Taiwan has been a hotspot for dengue fever transmission since 1998. During 2014 and 2015, Taiwan experienced unprecedented dengue outbreaks and the causes are poorly understood. This study aims to ... -
Effects Of Radio Transmitter Burdening On Locomotor Ability And Survival Of Iguana Hatchlings
(Allen Press, 2009)We performed a two-part experiment in 2007 and 2008 to investigate the effects of externally affixed radio transmitters on the locomotor performance and survival of green iguana {Iguana iguana) hatchlings. Using sprint ...