In most cases, that air makes a whistling or wheezing sound as it moves through narrowed passages. Excessive mucus production, shortness of breath, and cough are the other classic symptoms of asthma. But in cough-variant asthma, coughing is the only symptom. It sounds exotic, but it's far from rare.
Definition of photosystem : either of two photochemical reaction centers consisting chiefly of photosynthetic pigments complexed with protein and occurring in chloroplasts: a: one that absorbs light with a wavelength of about 700 nanometers â called also photosystem I b: one that absorbs light with a wavelength of about 680 nanometers â called also photosystem II new!
Wiktionary(3.00 / 1 vote)Rate this definition: 1  photograph(Noun) A picture created by projecting an image onto a photosensitive surface such as a chemically treated plate or film, CCD receptor, etc. 2  photograph(Verb) To take a photograph of. 3  photograph(Verb) To take photographs. 4  photograph(Verb) To appear in a photograph.