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Timelapse of a resurrection fern (Pleopeltis polypodioides) absorbing a drop of water. When the fronds "dry", the mesophyll deforms, which causes the lamina to curl and exposes the underside and show the peltate scales. The peltate scales help prevent photooxidation and mechanical damage, as well as assist in quick rehydration. [10]
Pleopeltis is a genus of ferns in the family Polypodiaceae, subfamily Polypodioideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I). [2] The genus widely distributed in tropical regions of the world, and also north into temperate regions in eastern North America and eastern Asia .
Bird fancier's lung (BFL), also known as bird breeder's lung, is a type of hypersensitivity pneumonitis.It can cause shortness of breath, fever, dry cough, chest pain, anorexia and weight loss, fatigue, and progressive pulmonary fibrosis (the most serious complication).
Symptoms typically include gradual onset of shortness of breath and a dry cough. [1] Other changes may include feeling tired, and clubbing abnormally large and dome shaped finger and toenails. [1] Complications may include pulmonary hypertension, heart failure, pneumonia or pulmonary embolism. [1] The cause is unknown, hence the term idiopathic ...
Beech leaf disease has quietly raced across the country infecting a particular species of tree critical to forest ecosystems, the American beech. Forget the lantern fly. A mysterious new pest has ...
Pulmonary veno-occlusive disease (PVOD) is a rare form of pulmonary hypertension caused by progressive blockage of the small veins in the lungs. [2] The blockage leads to high blood pressures in the arteries of the lungs, which, in turn, leads to heart failure .
Symptoms can overlap across causal agents, however differing signs and symptoms of certain pathogens can lead to the diagnosis of the type of leaf spot disease. Prolonged wet and humid conditions promote leaf spot disease and most pathogens are spread by wind, splashing rain or irrigation that carry the disease to other leaves.
Chronic Stage: Debilitating effects are now considered long-term. Symptoms include: severe shortness of breath, chronic coughing, physical weakness, occasional fever and sweating at night, decrease in appetite, and general aches and pains. [3] [4] These symptoms develop between four and eight hours after exposure to the antigens.