Mitochondrial research expanded in the late twentieth century after the invention of the electron microscope, and with the development of molecular genetic techniques, such as DNA sequencing and the use of enzymes that cut DNA at certain sites, called restriction endonuclease enzymes.ithin each mitochondrion is the mitochondrial DNA (mtDNA), which is different from the DNA in the cell's nucleus (nDNA). Organisms inherit their mitochondria only from their mothers via egg cells (oocytes).
Splenomegaly is a term which refers to enlargement of the spleen. The normal adult splenic length upper limit is usually around 12-15 cm.he causes of splenomegaly are protean, and can be thought of under a number of headings: 1  haematological disease. 2  haemodynamic. 3  infectious. 4  storage diseases/metabolic diseases. 5  neoplastic (non-haematologic).
Hypoattenuation is a term used to describe areas that show up as whiter and brighter than normal on an x-ray or CT Scan. Hypoattenuating lesions are commonly referred to in regards to the liver or kidneys.If your doctor looks on your CT scan and spots an area on your kidney or liver that is whiter or brighter than it should be, this is a hypoattenuating lesion.The lesion could be a sore or a cyst, but it could also be the sign of something more serious, such as a tumor. hypoattenuating lesion is a type of abnormal tissue that can show  up on computed tomography. On the scan, the lesion shows up as  brighter and whiter than what is conside â¦ red normal. The lesion can  indicate an array of medical issues and it warrants further  investigation. + 6 others found this useful.