tailieunhanh - INDOOR AIR QUALITY - SECTION 2

Chất gây dị ứng phấn hoa và SPORE Ngoại trừ hạn chế trong hầu hết môi trường (ví dụ như, một, kiểm soát môi trường lọc bong bóng bao vây), chất gây dị ứng ở khắp mọi nơi, và các chất gây dị ứng phổ biến nhất được công nhận là những hạt phấn hoa và các bào tử nấm. Các hạt phấn hoa là những tế bào sinh sản nam được phân tán bởi các nhà máy và thực hiện của côn trùng, động vật, và gió để thụ tinh cho hoa cái của các loài như. Chúng thường là. | Section II BIOAEROSOLS 2002 CRC Press LLC Chapter 4 POLLEN AND SPORE ALLERGENS Except in the most restrictive of environments . an environmentally controlled filtered bubble enclosure allergens are everywhere and the most commonly recognized allergens are pollen grains and fungal spores. Pollen grains are the male reproductive cells that are dispersed by plants and carried by insects animals and wind to fertilize the female flower of like species. They are typically outdoor allergens but have on occasion been found to be problematic due to the capture and retention of the pollen within an air system. Spores as presented herein are to include all forms of fungal spores . mold spores and mushroom basidiospores . Fungal spores are reported to affect greater than 20 percent of the adult population. It should be noted however that some bacteria may also produce spores and these are discussed more fully in Chapter 5. Pollen grains and spores must be airborne in order to cause respiratory allergy symptoms and the total exposure to all of these will have a varying affect on those exposed. The higher the exposures the greater the number of people affected. Their impact is irrespective of viability or their ability to grow. Dead molds do not go away. They merely stop reproducing and growing. Mold spores persist dead or alive OCCURRENCE OF POLLEN AND SPORE ALLERGENS Pollen grains are the male reproductive cells that are dispersed by plants and carried by insects animals and wind to fertilize the female flower of like species. Those that are carried by insects and animals tend to be sticky posses an elaborate exterior surface . spines and heavy ridges and are large by comparison to the other pollen grains . up to 250 microns in size . On the other hand those that are dispersed by wind tend to be non-sticky smooth light in density and small in size . generally less than 50 microns . These reproductive cells are produced by weeds grasses and trees. There are over