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Development of the Oral Microbiota

The establishment of the oral microbiome begins before birth, challenging the long-held belief that the fetal oral cavity is sterile. The presence of oral microbes such as Streptococcus and Fusobacterium in amniotic fluid suggests that microbial exposure may occur in utero, potentially through translocation from the maternal oral or gastrointestinal tract. This early colonization primes the neonatal immune system and sets the stage for subsequent microbial succession. Maternal health,...
Fetal Circulation01:14

Fetal Circulation

Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
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Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...
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Animal Mitochondrial Genetics

Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Video Experimental Relacionado

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Modeling Ascending Vaginal Infection, Preterm Birth, and Neonatal Morbidity in Mice
04:18

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Published on: October 10, 2025

Mortalidad materna: quién, cuándo, dónde y por qué.

Carine Ronsmans1, Wendy J Graham,

  • 1Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK. carine.ronsmans@lshtm.ac.uk

Lancet (London, England)
|October 3, 2006
PubMed
Resumen

El riesgo de mortalidad materna varía drásticamente en todo el mundo, y las regiones más pobres enfrentan riesgos significativamente más altos. Abordar esta disparidad de salud global requiere intervenciones específicas para las poblaciones vulnerables para lograr un progreso significativo.

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Área de la Ciencia:

  • Salud Global La salud global.
  • Salud reproductiva y salud reproductiva.
  • Demografía La demografía es la demografía.

Sus antecedentes:

  • El riesgo de mortalidad materna muestra disparidades globales extremas, con tasas de 1 en 6 en las regiones más pobres frente a 1 en 30.000 en el norte de Europa.
  • Esta discrepancia presenta un gran obstáculo para lograr el Objetivo de Desarrollo del Milenio para la reducción de la mortalidad materna.
  • El progreso en la reducción de la mortalidad materna se ve obstaculizado en los países de bajos ingresos por sistemas de salud débiles, altas tasas de fertilidad y datos inadecuados.

Objetivo del estudio:

  • Para resaltar las grandes disparidades en el riesgo de mortalidad materna a nivel mundial.
  • Identificar los desafíos en la reducción de la mortalidad materna en países de alto riesgo.
  • Hacer hincapié en la necesidad de intervenciones específicas para abordar las desigualdades en el riesgo de muerte materna.

Principales métodos:

  • Análisis de los datos mundiales de mortalidad materna y factores de riesgo.
  • Comparación de las tasas de mortalidad materna entre diferentes regiones del mundo.
  • Identificación de los períodos clave y las causas de la muerte materna.

Principales resultados:

  • Las muertes maternas se concentran durante el trabajo de parto, el parto y el período posparto.
  • La hemorragia obstétrica es la principal causa médica de muerte materna.
  • El aborto inseguro y el VIH / SIDA son causas significativas de muerte materna en poblaciones específicas.

Conclusiones:

  • El progreso sustancial en la reducción de la mortalidad materna requiere intervenciones específicas para los grupos vulnerables, incluidas las poblaciones rurales y empobrecidas.
  • Abordar los factores subyacentes como los sistemas de salud débiles y la alta fertilidad es crucial para los países de alto riesgo.
  • La reducción de las desigualdades en el riesgo de muerte materna es esencial para la equidad mundial en salud.