Is the arbitrary symmetrical?

Symmetrical polyarthritis is not always rheumatoid.

How arbitrary is language?

It is a long established convention that the relationship between sounds and meanings of words is essentially arbitrary--typically the sound of a word gives no hint of its meaning. However, there are numerous reported instances of systematic sound-meaning mappings in language, and this systematicity has been claimed to be important for early language development. In a large-scale corpus analysi...

The Reverse Sigmoid Ca-pth Relationship Is Not Symmetrical

We present a new, two-pool, linear, time-varying model to describe the short term dynamics of the Ca-PTH axis. We use an asymmetrical reverse sigmoid PTH secretion rate function in the model. This results in an asymmetrical reverse sigmoid relationship between plasma Ca++ and plasma parathyroid hormone (PTH) concentrations (Ca-PTH relationship). In the first validation of this kind, with parame...

The Symmetrical Liver

THE YOUNG INFANT with cyanotic congenital cardiac disease presents an acute and difficult diagnostic problem. The anomalies responsible for eyanosis in some such infants are now curable surgically while, on the other hand, there remains a group of eyanotic newborn infants in whom the congenital cardiac anomalies are so complex that no surgical procedures for their correction have yet been devis...

Symmetrical Gangrene

Symmetrical gangrene is a condition in which gangrene occurs in all four limbs, the nose and ears at the same time. This is a rare condition and only very few cases have been recorded. A number of conditions can cause symmetrical gangrene. These areas, i.e. the limbs, the ears and the nose, represent the outposts of the cardiovascular system. When the body needs to conserve, it conserves at the...