PURPOSE The relation between transfection efficiency of DNA/polymer complexes and DNA conformational alterations is investigated. The buffering capacity of several synthetic polymers is also studied to relate their performance in transfection efficiency. METHODS The cationic polymer/DNA interaction was evaluated by measuring the alteration of DNA secondary structures in solution before and af...

Saliva buffering test is in need of improvements. This article illustrates the most commonly used saliva buffering capacity tests and its major problems. Starting with Ericsson and his laboratory buffer capacity test and all the way to Kitasako a lot of issues are to release. The aim of this paper is to put saliva buffering tests up to serious discussion.

Xiaoming Zhu Joseph M. Kahn University of California Department of Electrical Engineering and Computer Sciences 307 Cory Hall Berkeley, California 94720-1772 E-mail: [email protected] Abstract. Buffering with optical delay lines (ODLs) in optical packetswitching networks is a way to mitigate network contention. We study queueing models of ODLs in synchronous and asynchronous optical packe...

Expression of recombinant proteins and drugs in Pichia pastoris has been in development since the late 1980s and the number of recombinant proteins produced in P. pastoris has increased significantly in the past several years. Unlike bacteria, this strain is capable of producing complex proteins with post translational modifications such as correct folding, glycosylation, proteolytic maturation...

Ray-tracing is one of the most researched areas in 3D photo-realistic image synthesis. We propose the T-BUFFER algorithm, which is a modification to the conventional ray-tracing algorithm and compares very favorably with it in terms of performance, which is achieved primarily through reduction in the number of unsuccessful intersection tests. Our major contribution is the integration of a shado...

The quality of service limitation of today’s Internet is a major challenge for real-time voice communications. Excessive delay, packet loss, and high delay jitter all impair the communication quality. A new receiver-based playout scheduling scheme is proposed to improve the tradeoff between buffering delay and late loss for real-time voice communication over IP networks. In this scheme the netw...

IT is widely accepted that the physiological activity of alkaloidal eye preparations results from the penetration through the cornea of the free base portion rather than of the ionic form of the alkaloid (Cogan and Kinsey, 1942; Cogan and Hirsch, 1944; Swan and White, 1942). Therefore, the smaller the pKb value of the alkaloid, the fewer free base particles will be available for drug action at ...

Luigi Atzori MCLab, Department of Electronic Engineering University of Cagliari Cagliari 09123 Italy [email protected] In the last few years, Voice over IP (VoIP) providers have been a strongly growth compared with traditional voice service operators. The main motivations are the low-cost of the packetbased technologies and the reliability of the current (wired) IP network. Nowadays a new ...

Acid infusion studies were performed in nephrectomized rats and dogs with either intact parathyroid glands (intact) or after thyroparathyroidectomy (thyroparathyroidectomized [TPTX]) to determine the role of parathyroid hormone (PTH) in extrarenal disposal and buffering of acutely administered acid. 29 intact rats given 5 mM/kg HCl and 6 intact dogs given 7 mM/kg HCl developed severe metabolic ...