As part of an immune response to foreign pathogens, histamine is produced by basophils and by mast cells found in nearby connective tissues. Histamine increases the permeability of the capillaries to white blood cells and some proteins, to allow them to engage pathogens in the infected tissues.
Where vegetation is sparse, temperature is hot. (Image: NASA) An urban heat island (UHI) is a metropolitan area which is significantly warmer than its surroundings. According to the EPA, many U.S. cities have air temperatures up to 10Â°F (5.6Â°C) warmer than the surrounding natural land cover.
Kiritimati, sometimes Christmas Island, is a Pacific Ocean raised coral atoll in the northern Line Islands, and part of the Republic of Kiribati.n addition to the main island, there are several smaller ones. Cook Island is part of the atoll proper but unconnected to the Kiritimati mainland. It is a sand/coral island of 19 ha (47 acres), divides Burgle Channel into the northern and the southern entrance, and has a large seabird colony.