Quasiclassical, direct dynamics trajectories, calculated at the B3LYP/6-31G** level of the theory, have been used to study the energy transfer dynamics and collision-induced dissociation ~CID! of formaldehyde cation in collisions with Ne. Effects of varying collision energy were probed for ground state H2CO , and H2CO 1 with excitation in three different vibrational modes: n6 1 ~in-plane CH2 ro...

An analog computer model has been developed to study the mechanism of the atrioventricular synchronization in one type of isorhythmic A-V dissociation (pattern I). The computer model simulates the following biological feedback control system: (1) the ventricular pacemaker frequency is independent of arterial blood pressure (analogous to artificial ventricular pacing); (2) the frequency of the a...

Methane hydrate dissociation at negative temperatures was studied experimentally for different artificial and natural samples, differing by macro- and micro-structural parameters. Four characteristic dissociation types are discussed in the paper. The internal kinetics of artificial granule gas hydrates and clathrate hydrates in coal is dependent on the porosity, defectiveness and gas filtration...

Dr Lavelle is from the Department of Orthopedics, SUNY Upstate Medical University, East Syracuse, and Dr Uhl is from the Division of Orthopedic Surgery, Albany Medical College, Albany, New York. Drs Lavelle and Uhl have no relevant fi nancial relationships to disclose. Correspondence should be addressed to: Richard Uhl, MD, Division of Orthopedic Surgery, Albany Medical College, 1367 Washington...

The development of quantitative techniques in mass spectrometry has generated the ability to systematically monitor protein expression. Isobaric tags for relative and absolute quantification (iTRAQ) have become a widely used tool for the quantification of proteins. However, application of iTRAQ methodology using ion traps and hybrid mass spectrometers containing an ion trap such as the LTQ-Orbi...

SUMMARY Direct correlation of extemally measured systolic time intervals with internally measured indices was obtained using catheter-tip micromanometers in six patients who had normal coronary arteriograms. Simultaneous recordings were made of central aorta and left ventricular pressure, maximum rate of rise in left ventricular pressure (dp/dt), external carotid pulse, external and internal so...

Oligosaccharides play important roles in many biological processes. However, the structural elucidation of oligosaccharides remains a major challenge due to the complexities of their structures. Mass spectrometry provides a powerful method for determining oligosaccharide composition. Tandem mass spectrometry (MS) provides structural information with high sensitivity. Oligosaccharide structures ...

The scapula is a somewhat mobile structure which, although fixed to the thoracic cage both by muscular and skeletal attachments, can change position with regards to the underlying chest wall [1]. The Scapulothoracic position is maintained by both muscles (serratus, rhomboids etc) and the clavicle which itself attaches laterally to the scapula (acromioclavicular joint) and medially to the chest ...