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Amblyopia. Anisometropia is a condition in which a person's eyes have substantially differing refractive power. [ 1] Generally, a difference in power of one diopter (1D) is the threshold for diagnosis of the condition. [ 2][ 3] Patients may have up to 3D of anisometropia before the condition becomes clinically significant due to headache, eye ...
The Tundra of North America is a Level I ecoregion of North America designated by the Commission for Environmental Cooperation (CEC) in its North American Environmental Atlas . One of the planet's most recent biomes, a result of the last ice age only 10,000 years ago, the tundra contains unique flora and fauna formed during the last glaciation ...
The isolation, combined with harsh climates characterised by low temperatures, strong westerly winds and few hours of sunlight in winter, have resulted in the evolution of many endemic plants and animals, though species richness is relatively low. Wind speeds reach an average of 40 km/h (25 mph) while even in summer the thick cloud cover ...
Alpine tundra. Hikers traversing the Franconia Ridge in the White Mountains of New Hampshire, much of which is in the alpine zone. Alpine tundra is a type of natural region or biome that does not contain trees because it is at high elevation, with an associated harsh climate. As the latitude of a location approaches the poles, the threshold ...
In physical geography, tundra ( / ˈtʌndrə, ˈtʊn -/) is a type of biome where tree growth is hindered by frigid temperatures and short growing seasons. The term is a Russian word adapted from Sámi languages. [ 2] There are three regions and associated types of tundra: Arctic tundra, [ 3] alpine tundra, [ 3] and Antarctic tundra.
Arctic vegetation. About 1,702 species of plants live on the Arctic tundra, including flowering plants, short shrubs, herbs, grasses, and mosses. These plants are adapted to short, cold growing seasons. [1] They have the ability to withstand extremely cold temperatures in the winter (winter hardiness), and grow and reproduce in summer ...
The human brain is one of the most complex structures nature has ever devised, and that means there’s a lot we still don’t know about the three pounds of neurons and fat that rests between our ...
Host and symptoms. The ascochyta blight disease complex affects field peas ( Pisum sativum ), as well as many other legumes such as chick peas, lentils, and faba beans. [6] Although three different pathogens cause ascochyta diseases of pea, the symptoms are relatively similar to one another, thus making diagnosis difficult.