Browsing Producción científica by Author "Echalar, Lourdes"
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Comparaison isoenzymatique de deux populations boliviennes (altitude et plaine) de Triatoma infestans (Hemiptera, Reduviidae)
Tibayrenc, Michel; Echalar, Lourdes; Carlier, Yves (ORSTOM, 1981)Résumé. Les auteurs comparent 2 populations boliviennes (altitude et plaine) de Triatoma infestans par l’analyse de 6 loci enzimatiques (enzymes phosphoglucomutase, malate déshydrogénse nad dépendante, malate déshydrogénase ... -
Données de génétique formelle pour six loci enzymatiquez chez Triatoma infestans (Hemiptera, Reduviidae)
Tibayrenc, Michel; Echalar, Lourdes; Carlier, Yves (O.R.S.T.O.M., 1981)Résumé. Les auteurs analysent 6 loci enzymatiques chez Triatoma infestans (enzymes phosphoglucomutase, malate déshydrogénase, “malic enzyme» et isocitrate déshydrogénase, électrophorèses sur acétate de cellulose) à partir ... -
Données isoenzymatiques pour onze souches boliviennes de Trypanosoma cruzi. Interprétation gégétique et calcul de distances
Tibayrenc, Michel; Brenière, Frédérique; Echalar, Lourdes; Carlier, Yves (Cah ORSTOM, 1981)Résumé. Les auteurs décrivent le profil isoenzymatique de 11 souches boliviennes de Trypanosoma cruzi pour 10 enzymes, par rapport à des cultures standard de référence. Ils tentent une interprétation génétique de ces ... -
Evidence for extraplacental sources of circulating angiogenic growth effectors in human pregnancy
Zamudio, Stacy; Kovalenko, Olga; Echalar, Lourdes; Torricos, T; Al-Khan, A; Álvarez, M; Illsley, Nicholas P (Placenta, 2013-08-24)Abastract. Pregnancy complications such as preeclampsia (PE) and intrauterine growth restriction (IUGR) are associated with reduced blood flow, contributing to placental and fetal hypoxia. Placental hypoxia is thought ... -
Hypoglycemia and the origin of hypoxia-induced reduction in human fetal growth
Zamudio, Stacy; Torricos, Tatiana; Fik, Ewa; Oyala, María; Echalar, Lourdes; Pullockaran, Janet; Tutino, Emily; Martin, Brittney; Belliappa, Sonia; Balanza, Elfride; Illsley, Nicholas P (PLOS One, 2010-01)Abtract. Background: The most well known reproductive consequence of residence at high altitude (HA .2700 m) is reduction in fetal growth. Reduced fetoplacental oxygenation is an underlying cause of pregnancy pathologies, ... -
Maternal and fetoplacental hypoxia do not alter circulating angiogenec growth effectors during human pregnancy
Zamudio, Stacy; Borges, Marcus; Echalar, Lourdes; Kovalenko, Olga; Vargas, Enrique; Torricos, Tatiana; Al Khan, Abdulla; Álvarez, Manuel; Illsley, Nicholas P (Biol Reprod., 2014-02-27)Abstract. One causal model of preeclampsia (PE) postulates that placental hypoxia alters the production of angiogenic growth effectors (AGEs), causing an imbalance leading to maternal endothelial cell dysfunction. We ... -
Maternal and fetoplacental hypoxia do not alter circulating angiogenic growth factors : the emperor's got no clothes?
Zamudio, Stacy; Williams, Shauna; Kovalenko, Olga; Borges, Marcus; Echalar, Lourdes; Torricos, Tatiana; Paiva, Priscilla; Illsley, Nicholas P (The Journal of Clinical Endocrinology & Metabolism, 2010)ABSTRACT. Context: Placental hypoxia alters production of angiogenic growth factors (AGFs), thought to be causally involved in the development of the pregnancy-specific disease preeclampsia (PE). Consistent with this, ... -
Maternal oxygen delivery is not related to altitude- and ancestry-associated differences in human fetal growth
Zamudio, Stacy; Postigo, Lucrecia; Illsley, Nicholas P; Rodríguez, Carmelo; Heredia, Gladys; Brimacombe, Michael; Echalar, Lourdes; Torricos, Tatiana; Téllez, Wilma; Maldonado, Iván; Balanza Erquicia, Elfride; Álvarez, Tatiana; Ameller, Julio; Vargas, Enrique (J Physiol, 2007-09-16)Fetal growth is reduced at high altitude, but the decrease is less among long-resident populations. We hypothesized that greater maternal uteroplacental O2 delivery would explain increased fetal growth in Andean natives ... -
New data demonstrates that relationship of salivary to serum progesterone in Bolivian women is comparable to that in other populations
Thornburg, Jonathan; Bellido, Diva; Stewart, Rose; Spielvogel, Hilde; Echalar, Lourdes; Burch, Jennifer; Vitzthum, Virginia J (36th Annual Meeting Minnesota, 2011-04-13)Abstract. Salivary progesterone (P) concentration is widely used in field studies as a relatively easy-to-measure proxy for serum P. Chatterton et al. [Fertility & Sterility 86:723 (2006)] compared sample means of ... -
Prevalence of Trypanosoma cruzi infection in blood banks of seven department of Bolivia
Carrasco, Roxana; Miguez, Hortensia; Camacho, Clara; Echalar, Lourdes; Revollo, Suzana; Ampuero, Tania; Dedet, Jean-Pierre (Mem. Inst. Oswaldo Cruz, 1990)Trypanosoma cruzi infection was studied in 1,298 sera samples of blood banks from 7 capital departments of Bolivia, using the immunofluorescence test (IFI) and Enzyme Linked Immuno sorbent Assay (ELISA). The percentages ... -
Prevalencia de la infección por Trypanosoma Cruzi en bancos de sangre de siete departamentos de Bolivia
Carrasco, Roxana; Miguez, Hortensia; Camacho, Clara; Echalar, Lourdes; Revollo, Susana; Ampuero, Tania; Dedet, Jean Pierre (Papiro, 1990)Abstract Trypanosoma cruzi infection was studied in 1,298 sera samples of blood banks from 7 capital departments of Bolivia, using the immunofluorescence test (IFI) and Enzyme Linked Immunosorbent Assay (ELISA). The ... -
Présence en Bolivie de sept nouveaux variants isoenzymatiques de Trypanosoma cruzi. Considérations taxonomiques et épidémiologiques. Discussion sur la valeur antigénique potentielle de certaines isoenzymes
Tibayrenc, Michel; Echalar, Lourdes; Le Pont, François; Desjeux, Philippe (Cah. O.R.S.T.O.M., 1983)Abastract. Les auteurs décrivent la variabilité génétique de 45 isolats boliviens de Trypanosoma cruzi à l’aide de 12 loci isoenzymatiques. Ils montrent la présence de deux groupes principaux, avec cependant une importante ... -
Sur le statut taxonomique et médical des souches isoenzymatiques de Trypanosoma cruzi. Considérations sur la valeur systématique et immunogénique des différentes isoenzymes
Tibayrenc, Michel; Echalar, Lourdes; Brenière, Frédérique; Lemesre, Jean-Loup; Barnabé, Christian; Desjeux, Philippe (C.R. Acad. Sc., 1983)Resumme. Les calculs de distances génétique pour 45 isolats boliviens de Trypanosoma cruzi montrent l’absence de continuum parmi eux et permettent de distinguer deux groupes principaux, dont l’origine est peut-être une ... -
Une méthode simple pour obtenir directement des isolats de Trypanosoma cruzi à partir du tube digestif du triatome vecteur
Tibayrenc, Michel; Echalar, Lourdes; Desjeux, Philippe (Cah, O.R.S.T.O.M., 1982)Résumé. Nous décrivons ici une méthode directe pour obtenir des isolats de Trypanosoma cruzi à partir de l’insecte vecteur, sans passer par l’étape intermédiaire d’inoculation à la souris. -
Where the O2 goes to : preservation of human fetal oxygen delivery and consumption at high altitude
Postigo, Lucrecia; Heredia, Gladys; Illsley, Nicholas P; Torricos, Tatiana; Dolan, Caitlin; Echalar, Lourdes; Téllez, Wilma; Maldonado, Iván; Brimacombe, Michael; Balanza, Elfride; Vargas, Enrique; Zamudio, Stacy (The Journal of Physiology, 2009)Fetal growth is decreased at high altitude (> 2700 m). We hypothesized that variation in fetal O2 delivery might account for both the altitude effect and the relative preservation of fetal growth in multigenerational ...