Heart disease resulting from a lung (pulmonary) disorder. A complication of lung disorders where the blood flow ... more 1  Â». Pulmonary heart disease: Heart disease that is caused by pulmonary conditions.
DNA was first isolated by Friedrich Miescher in 1869. Its molecular structure was identified by James Watson and Francis Crick in 1953, whose model-building efforts were guided by X-ray diffraction data acquired by Rosalind Franklin.
To fit inside cells, DNA is coiled tightly to form structures we call chromosomes. Each chromosome contains a single DNA molecule. Humans have 23 pairs of chromosomes, which are found inside the cell's nucleus. DNA discovery. DNA was first observed by a German biochemist named Frederich Miescher in 1869.