| 251. |
- Zapata Campos, María José, 1972, et al.
(författare)
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Translating development aid into city management: the barrio Acahualinca integrated development programme in Managua, Nicaragua
- 2013
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Ingår i: Public Administration and Development. - : Wiley. - 1099-162X .- 0271-2075. ; 33:2, s. 101-112
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Tidskriftsartikel (refereegranskat)abstract
- This article seeks to understand how development aid is translated into city management practice in the global South and the implications of this for the power dynamics between municipal governments and international aid agencies. The study examines La Chureca, the rubbish dump and slum of Managua, Nicaragua, and its regeneration programme, the Barrio Acahualinca Integrated Development Programme. In the article, we explore the formulation and initial implementation of the Programme in terms of the construction of an action net in which, by a chain of translations, the Programme was transformed from an aid programme managed by international aid organisations into the management practice of the city of Managua. Despite the silent infiltration of important issues brought to the municipal political agenda by the development aid programme, small acts of defiance and resistance were also enacted by local actors who twisted the Programme to fit local needs.
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| 252. |
- Bryngelsson, Tomas
(författare)
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Occurrence of Meloidogyne sp. and Pratylenchus sp. in conventional and organic coffee systems in Nicaragua
- 2011
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Ingår i: Nematropica. - 0099-5444. ; 41, s. 82-90
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Tidskriftsartikel (refereegranskat)abstract
- Herrera, I., T. Bryngelsson and A. Monzon. 2011. Occurrence of Meloidogyne sp. and Pratylenchus sp. in conventional and organic coffee systems in Nicaragua. Nematropica 41: 82-90.Conventional and organic coffee management systems can have a significant impact on soil biota. Plant-parasitic nematodes are important members of the soil biota community and they may be affected by management practices. The main objective of this study was to compare the effect of coffee management systems, shade trees and no shade trees on the population of Meloidogyne sp. and Pratylenchus sp. associated with coffee cultivation in Nicaragua. Five management systems, resulting from the combination of input levels and shade species were evaluated. The management systems were conventional with shade from nitrogen fixer species, conventional with shade from non nitrogen fixer species, conventional with no shade, organic with shade from nitrogen fixer species and organic with shade from non nitrogen fixer species. Soil samples were collected from June 2006 to February 2008, during the rainy and dry seasons. Meloidogyne sp. and Pratylenchus sp. were present in all five managements systems. The population of Meloidogyne sp. was significantly lower in the organic management with shade from non nitrogen fixer species than in conventional management with shade from nitrogen fixer. The population of Meloidogyne sp. in conventional management with no shade (open sun) and organic management with shade from non nitrogen fixer were similar. The population of Pratylenchus sp. was lower than the Meloidogyne sp. population in all five management systems. Higher densities of Pratylenchus were observed in conventional and organic management where non nitrogen fixer shade species were present. Lower densities of Pratylenchus sp. were found in conventional and organic management with shade from nitrogen fixer species, and in conventional management with no shade (open sun). The occurrence of Meloidogyne and Pratylenchus spp. was significantly affected by shade conditions and input levels, with different response from both genera; therefore these factors should be regarded when designing programs for integrated pest management of nematodes in Nicaraguan coffee plantations.
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| 253. |
- Kern, Christoph, et al.
(författare)
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Halogen oxide measurements at Masaya Volcano, Nicaragua using active long path differential optical absorption spectroscopy
- 2009
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Ingår i: Bulletin of Volcanology. - 0258-8900 .- 1432-0819. ; 71, s. 659-670
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Tidskriftsartikel (refereegranskat)abstract
- Active Long Path Differential Optical Absorption Spectroscopy (LP-DOAS) measurements of halogen oxides were conducted at Masaya Volcano, in Nicaragua from April 14 to 26, 2007. The active LP-DOAS system allowed night-time halogen measurements and reduced the ClO detection limit by an order of magnitude when compared to previous passive DOAS measurements, as wavelengths below 300 nm could be used for the DOAS retrievals. BrO was detected with an average BrO/SO2 molecular ratio of approximately 3 × 10−5 during the day. However, BrO values were below the detection limit of the instrument for all night-time measurements, a strong indication that BrO is not directly emitted, but rather the result of photochemical formation in the plume itself according to the autocatalytic “bromine explosion” mechanism. Despite the increased sensitivity, both ClO and OClO could not be detected. The achieved upper limits for the X/SO2 ratios were 5 × 10−3 and 7 × 10−6, respectively. A rough calculation suggests that ClO and OClO should be present at similar abundances in volcanic plumes. Since the DOAS technique is orders of magnitude more sensitive for OClO than for ClO, this indicates that OClO should always be detectable in plumes in which ClO is found. However, further LP-DOAS studies are needed to conclusively clarify the role of chlorine oxides in volcanic plumes.
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| 254. |
- Kåresdotter, Elisie, et al.
(författare)
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Modeling the Carbon Sequestration Potential of Multifunctional Agroforestry-Based Phytoremediation (MAP) Systems in Chinandega, Nicaragua
- 2022
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Ingår i: Sustainability. - : MDPI AG. - 2071-1050. ; 14:9
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Tidskriftsartikel (refereegranskat)abstract
- Global sustainability challenges associated with increasing resource demands from a growing population call for resource-efficient land-use strategies that address multiple sustainability issues. Multifunctional agroforestry-based phytoremediation (MAP) is one such strategy that can simultaneously capture carbon, decontaminate soils, and provide diverse incomes for local farmers. Chinandega, Nicaragua, is a densely populated agricultural region with heavily polluted soils. Four different MAP systems scenarios relevant to Chinandega were created and carbon sequestration potentials were calculated using CO2FIX. All scenarios showed the potential to store significantly more carbon than conventional farming practices, ranging from 2.5 to 8.0 Mg CO2eq ha−1 yr−1. Overall, carbon sequestration in crops is relatively small, but results in increased soil organic carbon (SOC), especially in perennials, and the combination of crops and trees provide higher carbon sequestration rates than monoculture. Changes in SOC are crucial for long-term carbon sequestration, here ranging between 0.4 and 0.9 Mg C ha−1 yr−1, with the most given in scenario 4, an alley cropping system with pollarded trees with prunings used as green mulch. The adoption rate of multifunctional strategies providing both commodity and non-commodity outputs, such as carbon sequestration, would likely increase if phytoremediation is included. Well-designed MAP systems could help reduce land-use conflicts, provide healthier soil, act as climate change mitigation, and have positive impacts on local health and economies.
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| 255. |
- Gonzalez-Rivas, B, et al.
(författare)
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Species composition, diversity and local uses of tropical dry deciduous and gallery forests in Nicaragua
- 2006
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Ingår i: Biodiversity and Conservation. - : Springer Science and Business Media LLC. - 0960-3115 .- 1572-9710. ; 15:4, s. 1509-1527
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Tidskriftsartikel (refereegranskat)abstract
- The floristic composition and diversity of tropical dry deciduous and gallery forests were studied in Chacocente Wildlife Refuge, located on the Pacific coast in Nicaragua during 1994 and 2000. Density, dominance and frequency as well as species and family important values were computed to characterize the floristic composition. A variety of diversity measures were also calculated to examine heterogeneity in each forest community. A total of 29 families, 49 genera and 59 species were represented in 2 ha dry deciduous forest. In the gallery forest, the number of families, genera and species recorded in 2000 inventory was 33, 48 and 58, respectively and slightly higher than the 1994 inventory. The number of stems >= 10 cm dbh varied from 451 to 489 per hectare in the deciduous forest, and from 283 to 298 per hectare in the gallery forest. The basal area was much larger for species in the gallery than dry deciduous forest. Fabaceae, sub family Papilionoideae, was the most specious family in the deciduous forest while Meliaceae was the dominant family in the gallery forest. Similarity in species composition and abundance between deciduous and gallery forests was low. In terms of species diversity, the gallery forest was found more diverse than the deciduous forest using Fisher's diversity index. Both forest communities were characterized by a typical inverse J shape. Therefore, emphasis should be given to the protection of rare species, i.e. as the forests are still under continued human pressure, an immediate action should be taken to conserve the remaining flora.
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| 256. |
- Aiuppa, Sandro, et al.
(författare)
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Tracking formation of a lava lake from ground and space: Masaya volcano (Nicaragua), 2015-2017
- 2018
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Ingår i: Geochemistry, Geophysics, Geosystems. - 1525-2027. ; 19:2, s. 496-515
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Tidskriftsartikel (refereegranskat)abstract
- A vigorously degassing lava lake appeared inside the Santiago pit crater of Masaya volcano (Nicaragua) in December 2015, after years of degassing with no (or minor) incandescence. Here, we present an unprecedented-long (3 years) and continuous volcanic gas record that instrumentally characterizes the (re)activation of the lava-lake. Our results show that, before appearance of the lake, the volcanic gas plume composition became unusually CO2-rich, as testified by high CO2/SO2 ratios (mean, 12.2±6.3) and low H2O/CO2 ratios (mean, 2.3±1.3). The volcanic CO2 flux also peaked in November 2015 (mean, 81.3±40.6 kg/s; maximum, 247 kg/s). Using results of magma degassing models and budgets, we interpret this elevated CO2 degassing as sourced by degassing of a volatile-rich fast-convecting (3.6-5.2 m3·s-1) magma, supplying CO2-rich gas bubbles from minimum equivalent depths of 0.36-1.4 km. We propose this elevated gas bubbles supply destabilized the shallow (<1 km) Masaya magma reservoir, leading to upward migration of vesicular (buoyant) resident magma, and ultimately to (re)formation of the lava lake. At onset of lava lake activity on 11 December 2015 (constrained by satellite-based (MODIS) thermal observations), the gas emissions transitioned to more SO2-rich composition, and the SO2 flux increased by a factor ~40 % (11.4±5.2 kg/s) relative to background degassing (8.0 kg/s), confirming faster than normal (4.4 vs. ~3 m3·s-1) shallow magma convection. Elevated shallow magma circulation is also supported by gradual increase in irradiated thermal energy, captured by MODIS, from which we calculate that 0.4-0.8 m3·s-1 of magma have been surface-emplaced since December 2015.
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| 257. |
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| 258. |
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| 259. |
- Bucardo, Filemon, et al.
(författare)
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The Lewis A phenotype is a restriction factor for Rotateq and Rotarix vaccine-take in Nicaraguan children
- 2018
-
Ingår i: Scientific Reports. - : NATURE PUBLISHING GROUP. - 2045-2322. ; 8
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Tidskriftsartikel (refereegranskat)abstract
- Histo-blood group antigens (HBGAs) and the Lewis and secretor antigens are associated with susceptibility to rotavirus infection in a genotype-dependent manner. Nicaraguan children were prospectively enrolled in two cohorts vaccinated with either RotaTeq RV5 (n = 68) or Rotarix RV1 (n = 168). Lewis and secretor antigens were determined by saliva phenotyping and genotyping. Seroconversion was defined as a 4-fold increase in plasma IgA antibody titer 1 month after administration of the first dose of the vaccine. Regardless of the vaccine administered, significantly fewer of the children with Lewis A phenotype (0/14) seroconverted after receiving the first vaccine dose compared to 26% (45/175) of those with the Lewis B phenotype and 32% (15/47) of the Lewis negative individuals (P amp;lt; 0.01). Furthermore, following administration of the RV1 vaccine, secretor-positive ABO blood group B children seroconverted to a significantly lesser extent (5%) compared to secretor-positive children with ABO blood groups A (26%) and O (27%) (P amp;lt; 0.05). Other factors such as pre-vaccination titers, sex, breastfeeding, and calprotectin levels did not influence vaccine-take. Differences in HBGA expression appear to be a contributing factor in the discrepancy in vaccine-take and thus, in vaccine efficacy in different ethnic populations.
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| 260. |
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