Where semi-formal is a step down from formal, semi-casual is a step up from casual.kirt or dresses for women is allowed. Button-down dress shirts, sweaters or polo shirts are great for men and women. Men may also wear a necktie but for semi-casual it s not expected. For a casual affair such as church, dinner at a friend s home, yachting or casual dining, a nice jacket or sweater for men is best.
Home Â» Algae. Definition. noun, singular: alga. A group of photosynthetic organisms that in general possess pigments such as chlorophyll but lack true roots, stems and leaves characteristic of terrestrial plants. algal (adjective) Of, pertaining to, characteristic of, or relating to an alga. Supplement.
Algae are photosynthetic microorganisms that are found in most habitats. Algae vary from small, single-celled forms to complex multi-cellular forms. An algal bloom is a rapid increase in the density of algae in an aquatic system.Algal blooms sometimes are natural phenomena, but their frequency, duration and intensity are increased by nutrient pollution.Algae can multiply quickly in waterways with an overabundance of nitrogen and phosphorus, particularly when the water is warm and the weather is calm.eduction in nutrients will reduce the occurrence and intensity of harmful algal blooms. The District, in partnership with other agencies, local governments and water utilities, has designed and constructed dozens of tailor-made projects to restore degraded water bodies.