k Ragweed pollen Ambrosia psilostachya, SEM Ragweed Ambrosia psilostachya pollen, scanning electron micrograph SEM. This pollen is an allergen. Ragweed is a main cause of weed allergies. Ragweed pollen is notorious for causing allergic reactions in humans, specifically allergic rhinitis. Up to half of all cases of pollenrelated allergic rhinitis in North America are caused by ragweeds. One of the main contributors to fall allergies is the ragweed plant. A single plant can produce one billion pollen grains per season. Ragweed grows abundantly throughout the South, North, and Midwest, and its lightweight pollen grains can travel up to 400 miles in the wind. Magnification x340 when shortest axis printed at 25 millimetres. Stock Photo - Afloimages
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Ragweed pollen Ambrosia psilostachya , SEM Ragweed Ambrosia psilostachya pollen, scanning electron micrograph SEM . This pollen is an allergen. Ragweed is a main cause of weed allergies. Ragweed pollen is notorious for causing allergic reactions in humans, specifically allergic rhinitis. Up to half of all cases of pollen related allergic rhinitis in North America are caused by ragweeds. One of the main contributors to fall allergies is the ragweed plant. A single plant can produce one billion pollen grains per season. Ragweed grows abundantly throughout the South, North, and Midwest, and its lightweight pollen grains can travel up to 400 miles in the wind. Magnification: x340 when shortest axis printed at 25 millimetres.
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Ragweed pollen (Ambrosia psilostachya), SEM

Ragweed (Ambrosia psilostachya) pollen, scanning electron micrograph (SEM). This pollen is an allergen. Ragweed is a main cause of weed allergies. Ragweed pollen is notorious for causing allergic reactions in humans, specifically allergic rhinitis. Up to half of all cases of pollen-related allergic rhinitis in North America are caused by ragweeds. One of the main contributors to fall allergies is the ragweed plant. A single plant can produce one billion pollen grains per season. Ragweed grows abundantly throughout the South, North, and Midwest, and its lightweight pollen grains can travel up to 400 miles in the wind. Magnification: x340 when shortest axis printed at 25 millimetres.

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