Rats bearing well-differentiated transplantable squamous cell carcinomas were given injections of thymidine-3 H, and the tumors were examined at intervals of time by radioautography with light and electron microscopes. Two hr after injection, labeled cells were almost exclusively in the undifferentiated areas of the tumor, and 96 hr after injection many cells of the well-differentiated pearls w...

Assessing the quality of pearls involves the use of various tools and methods, which are mainly visual and often quite subjective. Pearls are normally classified by origin and are then graded by luster, nacre thickness, surface quality, size, color and shape. The aim of this study was to investigate the capacity of Artificial Neural Networks (ANNs) to classify and estimate the quality of 27 dif...

– The dynamics of polymer collapse with a fixed distance between endpoints is studied analytically and numerically by the Nosé-Hoover algorithm. We find that at the pearling stage of the collapse the number of pearls decays as t−1/2 leading to anomalously long collapse time. To understand the effect of Stokes drag we reduced the problem of longpolymer-chain collapse to the one-dimensional diffu...

Pearls and Pitfalls in Head and Neck Surgery Introduction The EBSLN is the main motor supply to the CTM. The contraction of this muscle stretches the vocal fold, especially during the production of high frequency sounds [1] . Therefore, EBSLN paralysis leads to an important impairment of voice performance, mainly among women and voice professionals. This nerve crosses the superior thyroid vesse...

Sir, Annular lichen planus is an uncommonly reported variant of planus, especially on the penis [1]. Herein, we report a case penile annular induced by artificial pearls. A 42-year-old, circumcised male presented to our hospital with asymptomatic, lesions glans penis. Around one month prior presentation, he history inserting pearls inside his stainless steel. He denied drug intake or personal h...

Periodontitis is primarily a dental plaque induced inflammatory disease. Anatomic factors such as cervical enamel projections, enamel pearls, and developmental grooves are often associated with advanced, localized periodontal destruction. Enamel projections and pearls are mostly associated with molars. Enamel projections in the furcation areas of molars have no true attachment and are therefore...