An attack by Yemeni Houthi rebels on a Belize-flagged ship earlier this month caused an 18-mile (29-kilometer) oil slick, the U.S. military said Saturday. It also warned of the danger of a spill from the vessel’s cargo of fertilizer.
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Endothelial Senescence: From Macro- to Micro-Vasculature and Its Implications on Cardiovascular Health
Endothelial cells line at the most inner layer of blood vessels. They act to control hemostasis, arterial tone/reactivity, wound healing, tissue oxygen, and nutrient supply. With age, endothelial cells become senescent, characterized by reduced regeneration capacity, inflammation, and abnormal secretory profile. Endothelial senescence represents one of the earliest features of arterial ageing and contributes to many age-related diseases. Compared to those in arteries and veins, endothelial cells of the microcirculation exhibit a greater extent of heterogeneity. Microcirculatory endothelial senescence leads to a declined capillary density, reduced angiogenic potentials, decreased blood flow, impaired barrier properties, and hypoperfusion in a tissue or organ-dependent manner.
Speed of Light Could Be Dropped to Zero Using Crystals
In a vacuum like space, the speed of light is just over 186,280 miles per second. Scientists have now shown it’s possible to slow it down to zero miles per second without sacrificing its brightness, regardless of its frequency or bandwidth.