Conflict and desire into question: The tension of individualization in couple relationship experience in Chilean young adults / Sin conflicto y sin deseo: las tensiones de la individualización en la experiencia de pareja de jóvenes chilenos

Resumen Este artículo busca conocer y comprender las tensiones en las dimensiones de amor, sexualidad e intimidad en la experiencia de pareja en jóvenes hombres y mujeres de nivel socioeconómico medio y bajo, residentes en la ciudad de Santiago de Chile. La sociedad chilena ha vivido importantes transformaciones sociales y culturales que han impactado las formas de parentesco, en particular, las relaciones de pareja. Desde una perspectiva fenomenológico-hermenéutica, se analizaron e interpretaron los relatos de vida y el material recogido mediante grupos focales de hombres y mujeres entre 18 y 25 años. Los resultados evidencian tensiones y ambivalencias en el lugar dado al otro de la pareja en jóvenes chilenos. Los quiebres de los mandatos sobre la pareja, vinculados a la experiencia del conflicto, dependencia y deseo sexual, implican el despliegue de estrategias de regulación que tienden a minimizar las diferencias ya sea a través de la comunicación que intenta hacer transparente el mundo interno al otro, la evitación del conflicto o la suspensión de la relación.

Abstract This paper intends to learn and understand tensions in love, sexuality, and intimacy dimensions according to the experience of couples ranked in middle and low socioeconomic status, which inhabit in Santiago de Chile. Chilean society has gone through significant social and cultural changes that have had an impact on kinship forms, especially in couple relationships. From a phenomenological and hermeneutic perspective, life narratives and material collected from focus groups of men and women between 18 and 25 years old were analyzed. Results evidenced pressure and ambivalence in regards to the Chilean young´s conception about the role of the other. Breakdowns in couple agreements, associated with conflict, dependence, and sexual desire involve in motion of regulatory strategies tending to minimize differences, either through communication, that might see through the other's inner world, or conflict avoidance, or the end of the relationship.

Monitoreo de presión intracraneana: indicaciones y tecnica / Intracranial pressure monitoring: indications and technique

La comprensión de la fisiopatología de la hipertensión intracraneal está basada en la doctrina de Monro-Kellie y con los estudios de Lundberg se inició la aplicación clínica del monitoreo de la presión intracraneana (PIC). El único recurso existente y seguro para confirmar o excluir una hipertensión intracraneal es el monitoreo de PIC, que puede efectuarse mediante diversos métodos y en diferentes compartimentos, con sus respectivas ventajas y desventajas. Las complicaciones son infrecuentes en estos procedimientos. La indicación más frecuente, en general, es en el monitoreo multimodal del traumatismo craneoencefálico.

An association study of bipolar mood disorder (type I) with the 5-HTTLPR serotonin transporter polymorphism in a human population isolate from Colombia.

The short variant of a functional length polymorphism in the promoter region of the serotonin transporter has been associated with several behavioural and psychiatric traits, including bipolar mood disorder. The same short allele has also been implicated as a modifier of the bipolar phenotype. Here we evaluate the etiologic/modifier role of this polymorphism in a case (N=103) / control (N=112) sample for bipolar mood disorder (type I) collected from an isolated South American population. We did not detect an association between bipolar disorder and the 5-HTT promoter polymorphism in this sample. However, an excess of the short allele was seen in younger cases and in cases with psychotic symptoms. When combined with data from the literature, the increased frequency of the short allele in patients with psychotic symptoms was statistically significant.

Autosomal, mtDNA, and Y-chromosome diversity in Amerinds: pre- and post-Columbian patterns of gene flow in South America.

To evaluate sex-specific differences in gene flow between Native American populations from South America and between those populations and recent immigrants to the New World, we examined the genetic diversity at uni- and biparental genetic markers of five Native American populations from Colombia and in published surveys from native South Americans. The Colombian populations were typed for five polymorphisms in mtDNA, five restriction sites in the beta-globin gene cluster, the DQA1 gene, and nine autosomal microsatellites. Elsewhere, we published results for seven Y-chromosome microsatellites in the same populations. Autosomal polymorphisms showed a mean G(ST) of 6.8%, in agreement with extensive classical marker studies of South American populations. MtDNA and Y-chromosome markers resulted in G(ST) values of 0.18 and 0.165, respectively. When only Y chromosomes of confirmed Amerind origin were used in the calculations (as defined by the presence of allele T at locus DYS199), G(ST) increased to 0.22. G(ST) values calculated from published data for other South American natives were 0.3 and 0.29 for mtDNA and Amerind Y chromosomes, respectively. The concordance of these estimates does not support an important difference in migration rates between the sexes throughout the history of South Amerinds. Admixture analysis of the Colombian populations suggests an asymmetric pattern of mating involving mostly immigrant men and native women.

Strong Amerind/white sex bias and a possible Sephardic contribution among the founders of a population in northwest Colombia.

Historical and genetic evidences suggest that the recently founded population of Antioquia (Colombia) is potentially useful for the genetic mapping of complex traits. This population was established in the 16th-17th centuries through the admixture of Amerinds, Europeans, and Africans and grew in relative isolation until the late 19th century. To examine the origin of the founders of Antioquia, we typed 11 markers on the nonrecombining portion of the Y chromosome and four markers on mtDNA in a sample of individuals with confirmed Antioquian ancestry. The polymorphisms on the Y chromosome (five biallelic markers and six microsatellites) allow an approximation to the origin of founder men, and those on mtDNA identify the four major founder Native American lineages. These data indicate that approximately 94% of the Y chromosomes are European, 5% are African, and 1% are Amerind. Y-chromosome data are consistent with an origin of founders predominantly in southern Spain but also suggest that a fraction came from northern Iberia and that some possibly had a Sephardic origin. In stark contrast with the Y-chromosome, approximately 90% of the mtDNA gene pool of Antioquia is Amerind, with the frequency of the four Amerind founder lineages being closest to Native Americans currently living in the area. These results indicate a highly asymmetric pattern of mating in early Antioquia, involving mostly immigrant men and local native women. The discordance of our data with blood-group estimates of admixture suggests that the number of founder men was larger than that of women.

Microsatellites provide evidence for Y chromosome diversity among the founders of the New World.

Recently, Y chromosome markers have begun to be used to study Native American origins. Available data have been interpreted as indicating that the colonizers of the New World carried a single founder haplotype. However, these early studies have been based on a few, mostly complex polymorphisms of insufficient resolution to determine whether observed diversity stems from admixture or diversity among the colonizers. Because the interpretation of Y chromosomal variation in the New World depends on founding diversity, it is important to develop marker systems with finer resolution. Here we evaluate the hypothesis of a single-founder Y haplotype for Amerinds by using 11 Y-specific markers in five Colombian Amerind populations. Two of these markers (DYS271, DYS287) are reliable indicators of admixture and detected three non-Amerind chromosomes in our sample. Two other markers (DYS199, M19) are single-nucleotide polymorphisms mostly restricted to Native Americans. The relatedness of chromosomes defined by these two markers was evaluated by constructing haplotypes with seven microsatellite loci (DYS388 to 394). The microsatellite backgrounds found on the two haplogroups defined by marker DYS199 demonstrate the existence of at least two Amerind founder haplotypes, one of them (carrying allele DYS199 T) largely restricted to Native Americans. The estimated age and distribution of these haplogroups places them among the founders of the New World.