Dissociative photoionization of sulfur chlorides and oxochlorides: thermochemistry and bond energies based on accurate appearance energies.

The dissociative photoionization of four compounds, SCl(2), S(2)Cl(2), SOCl(2), and SO(2)Cl(2), were measured with threshold and imaging photoelectron photoion coincidence spectrometry (TPEPICO and iPEPICO). In all systems, the molecular ion loses a chlorine atom in a fast dissociation. The 0 K appearance energies of the first chlorine-loss fragment ions were determined to be 12.

Left ventricular noncompaction cardiomyopathy: what do we know?

Noncompaction is a rare and primary genetic cardiomyopathy affecting the left ventricle. The diagnosis is usually established by echocardiography, or, less frequently, by left ventriculography. Cardiac magnetic resonance and electrocardiography-gated multi-detector computed tomography are evolving noninvasive modalities to image cardiac structures, and have the utility to detect noncompacted myocardium.

Weighing the risks and benefits of cardiac imaging with ionizing radiation.

The potential risk of fatal malignancy related to cardiac imaging with ionizing radiation is frequently discussed in the medical literature and in the lay press. Clinicians must weigh this risk against the potential benefits of cardiac imaging, which are typically not considered in these reports about radiation risk. This review summarizes the evidence regarding both the radiation risks and clinical benefits of cardiac imaging to provide guidance to the clinician in specific clinical scenarios.

Radiation dose reduction in CT coronary angiography.

During recent years, technologic advancements in computed tomography (CT) have allowed robust cardiac and coronary imaging. Small, mobile cardiac structures such as the coronary arteries can now be imaged directly and noninvasively with high precision. Given the fact that coronary CT angiography (CCTA) can detect preclinical calcified and noncalcified atherosclerosis, there is potential to revolutionize the management of ischemic heart disease by refining risk stratification and improving outcomes in various clinical settings.

An agenda for action on global e-health.

Use of e-health, or electronic information technologies, has spread to cities and remote villages worldwide. Countries such as Rwanda are activating nationwide e-health networks. The Rockefeller Foundation's month-long 2008 conference Making the eHealth Connection: Global Partners, Local Solutions accelerated this process.

2-[5-(Benzo[d]thia-zol-2-yl)thio-phen-2-yl]benzo[d]thia-zole.

The structure of the title compound, C(18)H(10)N(2)S(3), consists of a central thio-phene ring and two terminal thia-zole rings. The two S atoms of the thia-zole rings are trans to the thio-phene S atom sulfur. The thia-zole rings are approximately coplanar with the thio-phene ring, with dihedral angles of 6.

Relationship between coronary endothelial function and coronary calcification in early atherosclerosis.

Background: The relationship between coronary endothelial function and coronary calcification is not well established.

Methods: Forty-six patients 17 men [37%]; age, 47.4+/-11.

Photoionization of three isomers of the C9H7 radical.

Three resonance-stabilized radicals, 1-indenyl (Ind), 1-phenylpropargyl (1PPR), and 3-phenylpropargyl (3PPR), all isomers of the composition C(9)H(7), were generated by jet flash pyrolysis. Their photoionization was examined by VUV synchrotron radiation. The mass spectra show a clean and efficient radical generation when the pyrolysis is turned on.

Resonant UV-fs-TCFWM spectroscopy on formaldehyde.

The first electronically excited singlet A 1A2 state of formaldehyde (H2CO) is the origin of different competing dissociation channels. An all-ultraviolet (UV) electronically resonant variant of time-resolved fs-two-colour four-wave mixing (fs-TCFWM) spectroscopy has been applied to monitor the dynamics of rovibrational manifolds in this state. The method provides a variety of options to probe molecular dynamics according to the temporal sequence of dipole transitions involved.

Radiation dose and safety in cardiac computed tomography.

As a result of the changes in use of imaging procedures that rely on ionizing radiation, the collective dose has increased by over 700%, and the annual per-capita dose by almost 600% in recent years. It is possible that this growing use may have significant effects on public health. Although uncertainties exist related to the accuracy of estimated radiation exposure and biologic risk, there are measures that can be taken by the referring and the performing health care provider to reduce the potential risks while maintaining diagnostic accuracy.

Coronary computed tomographic angiography: current role in the diagnosis and management of coronary artery disease.

Advances in computed tomography (CT) technology allow images to be obtained with high spatial and temporal resolution. These features now permit noninvasive coronary CT angiography (CCTA). Many studies addressing proof of concept, feasibility, and clinical robustness have been published since CCTA was first described.

International, multidisciplinary update of the 2006 Appropriateness Criteria for cardiac computed tomography.

Background: A multi-society document outlining appropriateness criteria for cardiac CT (CCT) was published in 2006. Since then, CCT has experienced rapid growth in technologic advances and clinical use. We sought to reassess opinion about the appropriate use of CCT among an international group of experts in the field.

Early matrix change of a nanostructured bone grafting substitute in the rat.

A nanocrystalline bone substitute embedded in a highly porous silica gel matrix (NanoBone) has previously been shown to bridge bone defects by an organic matrix. As the initial host response on the bone graft substitute might be a determinant for subsequent bone formation, our present purpose was to characterize the early tissue reaction on this biomaterial. After implantation of 80 mg of NanoBone into the adipose neck tissue of a total of 35 rats, grafts were harvested for subsequent analysis at days 3, 6, 9, 12, and 21.

Health information technology: dispatches from the revolution.

Countries around the world are increasingly employing health information technology (IT). These tools hold the promise of powerful health system breakthroughs from Johannesburg to Jakarta. While implementers multiply, a global e-health consensus framework is beginning to take shape among donors, governments, industries, researchers, and policymakers.

Coronary computed tomography and magnetic resonance imaging.

Cardiac computed tomography and magnetic resonance are relatively new imaging modalities that can exceed the ability of established imaging modalities to detect present pathology or predict patient outcomes. Coronary calcium scoring may be useful in asymptomatic patients at intermediate risk. Computed tomographic coronary angiography is a first-line indication to evaluate congenitally abnormal coronary arteries and, along with stress magnetic resonance myocardial perfusion imaging, is useful in symptomatic patients with nondiagnostic conventional stress tests.

Estimated radiation dose associated with cardiac CT angiography.

Context: Cardiac computed tomography (CT) angiography (CCTA) has emerged as a useful diagnostic imaging modality in the assessment of coronary artery disease. However, the potential risks due to exposure to ionizing radiation associated with CCTA have raised concerns.

Objectives: To estimate the radiation dose of CCTA in routine clinical practice as well as the association of currently available strategies with dose reduction and to identify the independent factors contributing to radiation dose.