Video Experimental Relacionado

Updated: Jul 20, 2026

Laboratory Simulation of an Iron(II)-rich Precambrian Marine Upwelling System to Explore the Growth of Photosynthetic Bacteria

Laboratory Simulation of an Iron(II)-rich Precambrian Marine Upwelling System to Explore the Growth of Photosynthetic Bacteria

Published on: July 24, 2016

Algas eucariotas megascópicas de la formación de hierro negaunee de hace 2.100 millones de años, Michigan

T M Han¹, B Runnegar

¹Research Laboratory, Cliffs Mining Services Company-Michigan, Ishpeming 49849.

Science (New York, N.Y.)

|July 10, 1992

Resumen

Se descubrieron fósiles de Grypania spiralis, un tipo de algas, en Michigan, que datan de hace 2.100 millones de años. Este hallazgo sugiere que las células eucariotas se originaron mucho antes de lo que se pensaba.

Área de la Ciencia:

Paleontología Paleontología.
Geología Geología Geología.
Biología Biología Biología.

Sus antecedentes:

Los fósiles de Grypania spiralis se han encontrado en todo el mundo, pero su edad y origen siguen siendo objeto de investigación.
Descubrimientos anteriores colocaron fósiles de Grypania en formaciones geológicas más jóvenes.

Objetivo del estudio:

Para informar sobre el descubrimiento de fósiles excepcionalmente antiguos de Grypania spiralis.
Reevaluar la línea de tiempo para el origen de la vida eucariota.

Principales métodos:

Exploración de campo y recolección de fósiles en la Formación de Hierro Negaunee.
Datamiento geológico de la Formación de Hierro Negaunee.

Principales resultados:

Cientos de ejemplares de Grypania spiralis fueron encontrados en la formación de hierro Negaunee de hace 2100 millones de años.
Esta ocurrencia es significativamente más antigua que los fósiles de Grypania previamente conocidos.

Conclusiones:

El descubrimiento hace retroceder el registro fósil conocido de Grypania.
Esto sugiere que el origen de las células eucariotas portadoras de orgánulos es anterior a hace 2.100 millones de años.

Más Videos Relacionados

Growing Magnetotactic Bacteria of the Genus Magnetospirillum: Strains MSR-1, AMB-1 and MS-1

Growing Magnetotactic Bacteria of the Genus Magnetospirillum: Strains MSR-1, AMB-1 and MS-1

Published on: October 17, 2018

Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment

Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment

Published on: February 27, 2021

Videos de Conceptos Relacionados

Red Algae

Red Algae

Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...

Green Algae

Green Algae

Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...

Other Algae

Other Algae

The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...

Origin of Photosynthesis

Origin of Photosynthesis

Photosynthesis represents a fundamental biological process that transformed Earth's atmosphere and paved the way for complex life. Emerging roughly 3.4–3.8 billion years ago, the earliest photosynthetic organisms harnessed light energy to produce organic compounds. These anoxygenic phototrophs used electron donors like hydrogen sulfide (H₂S) or ferrous iron (Fe²⁺), rather than water, and did not release molecular oxygen (O₂) as a byproduct. Various groups, including green sulfur and purple...

Microbes and Other Elemental Cycles

Microbes and Other Elemental Cycles

Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...

Deep Sea Microbial Ecology

Deep Sea Microbial Ecology

The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...