Viaje a las profundidades del Océano (VIDEO) + Extrañas criaturas marinas (FOTOS)

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  Pero, ¿qué es un Océano? U n océano es una enorme masa de agua salada que representa un importante ecosistema para el equilibrio ecológico de la Tierra y que constituye el  71% de la superficie terrestre , gracias a los 360,132,000 km² de su extensión. Y,  ¿cuántos océanos existen? Lo que cubre gran parte de la superficie de la Tierra, es en sí, un solo océano. Es decir, una sola masa de agua. Para un mejor estudio, el hombre dividió esta enorme masa en 5 partes de acuerdo a su ubicación geográfica. Por ello, la expresión “los océanos”, es correcta. Importancia de los océanos *Absorben entre un 25 y 30% del dióxido de carbono emitido a la atmósfera, por lo que Equilibran el clima de toda la Tierra. *Representan numerosos ecosistemas para diversas formas de vida animal, vegetal, bacteriana, protista y fúngica. *Son hogar para miles de especies, conocidas y aún desconocidas. Existen aproximadamente 250,000 especies conocidas, pero se cree que puedan haber 750,000 más. *Proveen fuentes

Is there any connection between pregnancy and cancer metastasis?

Pregnancy might hold the key to understanding how cancer metastasizes in various mammals -- including humans, according to researchers.
Kshitiz, assistant professor in the department of biomedical engineering -- a shared department between the School of Dental Medicine, School of Medicine, and School of Engineering -- and Gunter Wagner and Andre Levchenko at Yale University used evolutionary biology to draw the connection in the Nature Ecology & Evolution journal.

Looking at cells from endometrium of various species, Scientists found that in order to resist invasion of the placenta, certain species have evolved over time to make their stromal cells -- the connective tissue cells in an organ -- highly resistant to any invasion

In contrast, humans are particularly vulnerable to cancer metastasis owing to their highly invasive placentation during pregnancy. This study identified the cause linking the curious similarity between pregnancy and cancer invasion across various mammals.

"This work fundamentally changes the way we look at cancer metastasis," said Kshitiz (one of the scientists). "Basically, it puts stromal cells at the center of invasion associated with cancer and pregnancy, correlating the two. Who thought that pregnancy and cancer are so similar, and pregnancy in some ways is just controlled invasion?"

Kshitiz continues, "In humans, unfortunately, the invasion in pregnancy as well as by cancer is much less controlled. Interestingly, there are mammals where both pregnancy and cancer malignancy are highly controlled, and now we know why. These mammals (the two hoofed animals: cows, horses, pigs, etc.) have evolved their barrier to invasion."
Source: Sciencedaily

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