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Sökning: WFRF:(Herrera Andrés)

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  • Abelev, Betty, et al. (författare)
  • Underlying Event measurements in pp collisions at root s=0.9 and 7 TeV with the ALICE experiment at the LHC
  • 2012
  • Ingår i: Journal of High Energy Physics. - Springer. - 1126-6708. ; :7
  • Tidskriftsartikel (refereegranskat)abstract
    • We present measurements of Underlying Event observables in pp collisions at root s = 0 : 9 and 7 TeV. The analysis is performed as a function of the highest charged-particle transverse momentum p(T),L-T in the event. Different regions are defined with respect to the azimuthal direction of the leading (highest transverse momentum) track: Toward, Transverse and Away. The Toward and Away regions collect the fragmentation products of the hardest partonic interaction. The Transverse region is expected to be most sensitive to the Underlying Event activity. The study is performed with charged particles above three different p(T) thresholds: 0.15, 0.5 and 1.0 GeV/c. In the Transverse region we observe an increase in the multiplicity of a factor 2-3 between the lower and higher collision energies, depending on the track p(T) threshold considered. Data are compared to PYTHIA 6.4, PYTHIA 8.1 and PHOJET. On average, all models considered underestimate the multiplicity and summed p(T) in the Transverse region by about 10-30%.
  • Caldera, Trinidad, et al. (författare)
  • Parasuicide in a low income country : results from a three year hospital surveillance in Nicaragua.
  • 2004
  • Ingår i: Scandinavian Journal of Public Health. - 1403-4948. ; 32:5, s. 349-355
  • Tidskriftsartikel (refereegranskat)abstract
    • Aims: A study was undertaken to assess the incidence of parasuicide in Nicaragua, to identify groups at risk, and to describe the characteristics of parasuicides, such as methods used and seasonal and diurnal patterns. Method: All hospital-admitted parasuicide cases in the area of León, Nicaragua, were assessed over a three-year period using standardized instruments. Results: Two hundred and thirty-three parasuicide cases were identified in the catchment area giving a parasuicide rate of 66.3/100,000 inhabitants per year based on the population 10 years and older. Corresponding figure for 15 years and older was 71.3. A majority were females (68.8%), who were significantly younger than the males (mean 20.8 years vs. mean 24.6 years). The highest rates were found in the age group 15 - 19 years with a female rate three times higher than the male rate (302.9 vs. 98.9). Pesticides, a highly lethal substance, were used as method in 19.1% of the attempts. Consistent seasonal variation with peaks in May - June and September - October were found over the years. Among parasuicide cases, 46.5% had been in contact with the healthcare system within 6 months before attempting suicide. Conclusions: Parasuicides represent a significant health problem among young people in Nicaragua. Preventive efforts should be directed especially towards the life situation for young girls, limitation of availability of suicide means, increased awareness in schools concerning suicidal problems, as well as improved management of patients with mental health problems within primary healthcare.
  • Dahlblom, Kjerstin, et al. (författare)
  • Home alone : children as caretakers in León, Nicaragua
  • 2009
  • Ingår i: Children and society. - 0951-0605. ; 23:1, s. 43-56
  • Tidskriftsartikel (refereegranskat)abstract
    • This article seeks to explore and understand the life situations of sibling caretakers in poor areas in León, Nicaragua. The every day lives for caretakers were studied through observations and interviews with children, informants and parents. The children themselves were satisfied and proud to be trusted as caretakers and felt useful in contributing to their families' livelihood. However, in a life course perspective the caretaking role implies a narrowing of life options. Early on they seem to acquire essential life skills but as they grow older many are at risk of falling behind due to their marginalised situation and lack of basic education.
  • Galeano, C.H., et al. (författare)
  • Gene-based single nucleotide polymorphism markers for genetic and association mapping in common bean
  • 2012
  • Ingår i: BMC Genetics. - 1471-2156 .- 1471-2156. ; 12
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: In common bean, expressed sequence tags (ESTs) are an underestimated source of gene-based markers such as insertion-deletions (Indels) or single-nucleotide polymorphisms (SNPs). However, due to the nature of these conserved sequences, detection of markers is difficult and portrays low levels of polymorphism. Therefore, development of intron-spanning EST-SNP markers can be a valuable resource for genetic experiments such as genetic mapping and association studies. Results: In this study, a total of 313 new gene-based markers were developed at target genes. Intronic variation was deeply explored in order to capture more polymorphism. Introns were putatively identified after comparing the common bean ESTs with the soybean genome, and the primers were designed over intron-flanking regions. The intronic regions were evaluated for parental polymorphisms using the single strand conformational polymorphism (SSCP) technique and Sequenom MassARRAY system. A total of 53 new marker loci were placed on an integrated molecular map in the DOR364 x G19833 recombinant inbred line (RIL) population. The new linkage map was used to build a consensus map, merging the linkage maps of the BAT93 x JALO EEP558 and DOR364 x BAT477 populations. A total of 1,060 markers were mapped, with a total map length of 2,041 cM across 11 linkage groups. As a second application of the generated resource, a diversity panel with 93 genotypes was evaluated with 173 SNP markers using the MassARRAY-platform and KASPar technology. These results were coupled with previous SSR evaluations and drought tolerance assays carried out on the same individuals. This agglomerative dataset was examined, in order to discover marker-trait associations, using general linear model (GLM) and mixed linear model (MLM). Some significant associations with yield components were identified, and were consistent with previous findings. Conclusions: In short, this study illustrates the power of intron-based markers for linkage and association mapping in common bean. The utility of these markers is discussed in relation with the usefulness of microsatellites, the molecular markers by excellence in this crop.
  • Herrera Rodríguez, Andrés, 1966- (författare)
  • Heaven can wait studies on suicidal behaviour among young people in Nicaragua
  • 2006
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • In developed countries, suicidal behaviour is recognised as a significant public health problem among young people, but there are few studies from developing countries on this subject. The present thesis aims at estimating the extent of the problem and at exploring factors related to suicidal behaviour among young people in a developing country, Nicaragua, using a combined quantitative and qualitative approach. Three studies were conducted between 1999 and 2006. In the first study, all hospital admitted suicide attempt cases in the area of León were assessed over a three year period. Secondly, a qualitative study using individual in-depth interviews was conducted with eight girls aged between 12 and 19 admitted to hospital after attempting suicide. Thirdly, a study using the Attitudes Towards Suicides (ATTS) questionnaire was conducted in a community based sample of 278 young people aged 15-24 years to assess own suicidal behaviours, attitudes towards suicide as well as exposure to suicidal behaviour among significant others.The hospital surveillance showed that suicide attempt rates were highest among females in the age group 15-19 years with a female rate three times that of males (302.9 versus 98.9 per 100,000 inhabits per year). Drug intoxication and pesticides were the most commonly used methods for the attempts. A consistent seasonal variation with peaks in May-June and September-October was found in each of the three years, possibly related to exam periods in schools.Findings in the qualitative approach led to a tentative model for pathways to suicidal behaviour based on four main categories: Structuring conditions, triggering events, emotions and action taken. Dysfunctional families, lack of confidential and trustworthy contacts and interpersonal conflicts followed by emotions of shame and anger were some important components in the model.The community studies showed that suicidal expressions (life-weariness, death wishes, suicidal ideation, suicide plans and suicide attempts) were common among young people where more than 44.8% of males and 47.4% of females reported some kind of suicidal expression. Gender differences were small. Exposure to suicidal behaviour among others was associated with higher levels of self-reported suicidal behaviour. The attitude study showed that boys had less pro-preventive attitudes than girls, possibly indicating their higher risk for completed suicide. Exposure to suicidal behaviour and own suicidal behaviour showed an association with specific patterns of attitudes.The findings should be taken into consideration when planning for prevention of suicidal behaviour among young people in a developing country like Nicaragua.
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