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Now showing items 4023-4042 of 13244
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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 ... -
Effects of season on donor and recipient cows and calf performance from birth to weaning in embryo transfer programs in the tropics
(MDPI, 2021-12-19)The aim of this study was to assess the seasonal effect of an embryo transfer program in the tropics on the donor response, recipient reproductive performance and calf growth from birth to weaning. This study included ... -
Effects of the protein: energy ratio in isocaloric diets on the growth of Cichlasoma managuense (Gunther 1869)
(Wiley & Sons, 1994)A feeding experiment was conducted to evaluate the growth of tiger guapote, Cichlasoma managuense (Gunther), fed on isocaloric diets with varying proteinxnergy ratios. The relative metabolic growth rate increased with ... -
Efficacy of calcein and Coomassie Blue dyeing of shell growing-edges and micro growth-bands: Ageing juvenile of Pinctada mazatlanica(Pterioida: Pteriidae)
(Universidad de Costa Rica, 2014)Age validation is the first step to determine shellfish species age determination. This information is vital for different inferential models used in marine ecosystem management activities. In spite that various validation ... -
Efficacy of Piper (Piperaceae) extracts for control of common home and garden insect pests
(Entomological Society of America, 2004)Extracts from three species of the plant family Piperaceae, Piper nigrum [L.], Piper guineense [Schum & Thonn], and Piper tuberculatum [Jacq.], were tested for efficacy against insects from five orders. All three species ...