A large percentage of eukaryotic genomes consist of repetitive DNA that plays an important role in the organization, size and evolution. In the case of crickets, chromosomal variability has been found using classical cytogenetics, but almost no information concerning the organization of their repetitive DNAs is available. To better understand the chromosomal organization and diversification of ...

Chondrocalcinosis, although very rare in young adults, can occur in some young patients. Although its presenting clinical history or radiographic findings may resemble those of an intraarticular loose body, chondrocalcinosis can occur in young athletes, possibly after repetitive microtrauma, and should be included in the differential diagnosis of calcified intraarticular lesions in the young at...

This paper proposes a discrete-time repetitive optimal control of electrically driven robotic manipulators using an uncertainty estimator. The proposed control method can be used for performing repetitive motion, which covers many industrial applications of robotic manipulators. This kind of control law is in the class of torque-based control in which the joint torques are generated by permanen...

L ike a parachute jump, mitosis can go badly wrong unless every connection is sound. The repetitive DNA sequences located at centromeres help secure mitotic links, Bassett et al. show (1). Contradicting previous evidence that the sequences are expendable, the study indicates that they help attract proteins necessary to repair faulty chromosome connections. Centromeres ensure that mitotic spindl...

Heterochromatin is a significant component of the human genome and the genomes of most model organisms. Although heterochromatin is thought to be largely non-coding, it is clear that it plays an important role in chromosome structure and gene regulation. Despite a growing awareness of its functional significance, the repetitive sequences underlying some heterochromatin remain relatively unchara...