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Recent Scientific Discoveries

Dark ocean bacteria discovered to play large role in carbon capture

This study reveals that despite their relatively low abundance, nitrite-oxidizing bacteria capture more than 1.1 gigatons of carbon dioxide in the mesopelagic zone annually. This is comparable to prior estimates of the total carbon captured in the entire dark ocean.

Marine bacteria that live in the dark depths of the ocean play a newly discovered and significant role in the global carbon cycle, according to a new study published in Science.

The “dark ocean” - everything that lies below 200 meters - makes up 90 percent of the ocean. Very little is known about the microscopic life in this realm and its critical role in transforming carbon dioxide to cell material, proteins, carbohydrates and lipids. This freshly produced organic material can then be consumed by other marine organisms enhancing the productivity of the ocean.

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New imaging study reveals how saturated fatty acids damage cells

In our increasingly health-conscious society, a new fad diet seems to pop up every few years. Atkins, Zone, Ketogenic, Vegetarian, Vegan, South Beach, Raw - with so many choices and scientific evidence to back each, it's hard to know what's healthy and what's not. One message, however, has remained throughout: saturated fats are bad.

A new Columbia University study reveals why.

While doctors, nutritionists and researchers have known for a long time that saturated fats contribute to some of the leading causes of death in the United States, they haven’t been able to determine how or why excess saturated fats, such as those released from lard, are toxic to cells and cause a wide variety of lipid-related diseases, while unsaturated fats, such as those from fish and olive oil, can be protective.

To find answers, Columbia researchers developed a new microscopy technique that allows for the direct tracking of fatty acids after they’ve been absorbed into living cells. The technique involves replacing hydrogen atoms on fatty acids with their isotope, deuterium, without changing their physicochemical properties and behavior like traditional strategies do. By making the switch, all molecules made from fatty acids can be observed inside living cells by an advanced imaging technique called stimulated Raman scattering (SRS) microscopy.

What the researchers found using this technique could have significant impact on both the understanding and treatment of obesity, diabetes and cardiovascular disease.

Published online December 1st in Proceedings of the National Academy of Sciences (PNAS), the team reports that the cellular process of building the cell membrane from saturated fatty acids results in patches of hardened membrane in which molecules are “frozen.” Under healthy conditions, this membrane should be flexible and the molecules fluidic.

“The behavior of saturated fatty acids once they’ve entered cells contributes to major and often deadly diseases,” Min said. “Visualizing how fatty acids are contributing to lipid metabolic disease gives us the direct physical information we need to begin looking for effective ways to treat them. Perhaps, for example, we can find a way to block the toxic lipid accumulation. We’re excited. This finding has the potential to really impact public health, especially for lipid related diseases.”

Yihui Shen et al, Metabolic activity induces membrane phase separation in endoplasmic reticulum, Proceedings of the National Academy of Sciences (2017). DOI: 10.1073/pnas.1712555114