barrier

First, therapies must cross the blood-brain barrier, a tightly controlled network of cells that protects the central nervous system from substances circulating in the bloodstream.

From Science Daily ● Jul. 17, 2026

GLUT1 can also recognize mannose, allowing the coated nanoparticles to use the same pathway to cross the blood-brain barrier.

From Science Daily ● Jul. 17, 2026

The $4-a-gallon threshold is seen as psychological barrier that can make drivers feel less optimistic about the economy and more worried about their own finances.

From MarketWatch ● Jul. 14, 2026

In France, youth sports are heavily subsidized by local municipalities and community groups, substantially lowering the barrier for entry.

From Los Angeles Times ● Jul. 12, 2026

Kunthi was different from the other women, quieter, more reserved, and for all that we tried to be at ease with her there was a barrier which we could not surmount.

From "Nectar in a Sieve" by Kamala Markandaya

What does it mean for you to be breaking down barriers for reggaeton Mexa?

From Los Angeles Times ● Jul. 20, 2026

These populations are more likely to suffer from chronic diseases such as diabetes, high blood pressure and obesity, and face socioeconomic barriers like lower educational attainment and less access to quality healthcare.

From MarketWatch ● Jul. 15, 2026

There are also other non-tariff barriers that continue to pose challenges.

From BBC ● Jul. 14, 2026

Gibraltar Chief Minister Fabian Picardo has described the agreement as removing "the physical barriers of a bygone era of friction" while keeping "the keys to our own front door".

From Barron's ● Jul. 14, 2026

The differences between those trajectories were stamped by continental differences in domesticable plants and animals, germs, times of settlement, orientation of continental axes, and ecological barriers.

From "Guns, Germs, and Steel: The Fates of Human Societies" by Jared M. Diamond