A set of small RNAs known as rasRNAs (repeat-associated small RNAs) have been related to the down-regulation of Transposable Elements (TEs) to safeguard genome integrity. Two key members of the rasRNAs group are piRNAs and endo-siRNAs. We have performed a comparative analysis of piRNAs and endo-siRNAs present in mouse oocytes, spermatozoa and zygotes, identified by deep sequencing and bioinform...

Consider the class of protocols, for two participants, in which the initiator applies a sequence of operators to a message M and sends it to the other participant ; in each step, one of the participants applies a sequence of operators to the message received last, and sends it back . This "ping-pong" action continues several times, using sequences of operators as specified by the protocol . The...

Micromouse and robotic ping pong have been interesting mechatronic applications for the past decade or more. Recently a number of educational institutions around the world have started using these two ‘fun’ robotic ideas as a basis for a more structured approach to robotic engineering education. At City Polytechnic of Hong Kong regular project work using micromouse has been going on for a numbe...

1 of 2 DESCRIPTION We report a term infant born by emergency C-section for fetal bradycardia. Active labour was established at the time of section, resulting in the fetus being deeply impacted and diffi cult to extract. Baby was born pale and fl oppy but responded to infl ation breaths. Antenatal scans were unremarkable. She was noted to have a depression measuring 4×4 cm in the right parietal ...

The motion of a classical particle bouncing elastically between two parallel walls, with one of the walls undergoing a periodic motion is considered. This problem, called Fermi–Ulam ‘ping-pong’, is known to possess only bounded solutions if the motion of the wall is sufficiently smooth p(t) ∈ C4+ , where p(t) is the position of the wall. It is shown that the stability result does not hold if p(...

In Drosophila melanogaster the reciprocal "Ping-Pong" cycle of PIWI-interacting RNA (piRNA)-directed RNA cleavage catalyzed by the endonuclease (or "Slicer") activities of the PIWI proteins Aubergine (Aub) and Argonaute3 (AGO3) has been proposed to expand the secondary piRNA population. However, the role of AGO3/Aub Slicer activity in piRNA amplification remains to be explored. We show that AGO...

Succinyl coenzyme A synthetase from Escherichia coli does not exhibit a steady state kinetic pattern indicative of “ping-pong” kinetics, despite the fact that catalytic participation of a phosphorylated enzyme covalent intermediate has been established. Instead, kineti.c patterns are consistent with the sequential addition of all substrates, to form a quaternary complex, before the release of a...

Lecture 8 on Events & Delays discussed and developed two models for the ping pong ball whose control was a ping pong paddle. First an event-driven controller and then a time-triggered controller. Invariants have been identified in Lecture 8 but not proved. This lecture will study proofs. This lecture discusses: • What is a proof? • How does arithmetic happen in a proof? • Arithmetic hiding to w...

The kinetic mechanism of pigeon liver fatty acid synthetase action has been studied using steady state kinetic analysis. Initial velocity studies are consistent with an earlier suggestion that the enzyme catalyzes this reaction by a seven-site ping-pong mechanism. Although the range of substrate concentrations that could be used was limited by several factors, the initial velocity patterns show...