"connecting portion" is a correct and usable phrase in written English.
You can use it to refer to a part of a sentence that connects two ideas. For example, "Therefore, there was a need for a connecting portion between ideas A and B."
Skilled reading requires orchestration of a large cortical network, and individual differences in reading performance have been linked to the properties of white matter tracts connecting portions of this network specialized for processing visual, acoustic, and semantic features1,2,3,4,5.
Immunofluorescence demonstrated specific staining for co-expressed TRPV1 and Cx43 in the cell-cell connecting portions in primary cultured human visceral adipocytes and visceral adipose tissues from both wild-type mice (WT) and humans.
These transcriptional regulators were located in the most densely connected portion of the network and share many connections.
Thus, the Yeast 5 GEM includes hypothetical transport reactions to better connect portions of the metabolic network that are unconnected in a graph-theoretical sense.
There were recreation areas, living quarters, supply storehouses, and underground rail lines connecting various portions of the line.
The northern section of the highway turns inland through wooded terrain, connecting rural portions of Delta and Marquette counties.
Two years later, another two-mile (3.2 km) segment connected the portion already in service to I-80S.
Since none of these segments were connected, this portion of road was redesignated Route 120 by the 1990s.
The hepatoduodenal ligament is formed at the free edge of the gastrohepatic ligament and connects this portion of the peritoneal cavity with the right anterior pararenal space.
In 2007, Isobe and co-workers reported the synthesis of malyngamide X [60], which possessed an unusual tripeptide portion connecting to a methoxylated fatty acyl chain (Scheme 15).
