Analysis of photo-initiators in visible-light-cured dental composite resins.

Seven commercial visible-light-cured (VL) dental composite resins were analytically studied for identification of the photo-initiator consisting of photo-sensitizer and reducing agent. Gas-liquid chromatography (GC) was used for the determination of the dilute components extracted from the composite resin. Mass spectroscopy (GC-MS) was used for confirmation of the qualitative data obtained by GC.

Local conduction delay causes R-wave amplitude increase in patients with effort angina.

Eighty-seven unipolar electrocardiograms distributed over the entire thorax were simulataneously recorded before and after treadmill exercise in 43 patients. Exercise-induced R-wave amplitude change (delta R) and peak R time (time from the onset of QRS to the peak of R wave), were calculated for each lead. The maximal delta R of 87 leads was designated as the max delta R.

ST segment changes in exercise body surface mapping after myocardial infarction in patients with isolated left anterior descending coronary artery disease.

To investigate the clinical significance of exercise-induced ST segment elevation and ST segment depression after myocardial infarction (MI), we performed 87-lead ECG mapping after previous anterior infarction in 24 patients with isolated left anterior descending coronary artery disease before and 1.5 minutes after treadmill exercise. Thirteen patients showed ST segment elevation only, seven patients showed both ST segment elevation and depression, and four patients showed ST segment depression only.

The body surface distribution of the QT interval in patients with previous myocardial infarction and normal subjects.

In spite of the clinical importance of the QT interval, its body surface distribution is still unclear. To determine the spatial distribution of the QT interval, we studied 20 normal subjects and 45 patients with previous myocardial infarction (25, anterior; 20, infero-posterior). Unipolar electrocardiograms were recorded from 87 torso sites.

Temporal changes in body surface peak R isochrone maps and left ventricular function in patients with myocardial infarction.

Body surface peak R isochrone mapping and radionuclide ventriculography were performed twice in 22 patients with myocardial infarction. Eighty-seven unipolar electrocardiograms distributed over the anterior chest and the back were recorded simultaneously. For each lead, the time from the onset of QRS to the peak of the R wave was measured.

Body surface mapping for the assessment of left ventricular hypertrophy in patients with essential hypertension.

To investigate the electrocardiographic abnormalities of left ventricular hypertrophy (LVH), body surface potential maps were acquired from 42 patients with essential hypertension. We adopted the time integral technique for analyzing body surface mapping data and used echocardiographic left ventricular muscle mass (LV mass) as the index of advance of LVH. The QRS, ST-T and QRST isointegral maps in normal volunteers all demonstrated smooth bipolar surface distribution patterns, with positive values located over the precordium and negative values over the right upper chest and back.

Inhibition of dipyridamole-induced myocardial ischemia by diltiazem in patients with coronary artery disease.

We investigated the effect of diltiazem on dipyridamole-induced myocardial ischemia in eight patients with coronary artery disease. Dipyridamole was infused at a rate of 0.142 mg/kg/min for 4 min, and 87-lead mapping was performed to determine the number of leads with ischemic ST-segment depression greater than or equal to 0.

Molecular characterization of novel reciprocal translocation t(6;14) in an Epstein-Barr virus-transformed B cell precursor.

An in vitro culture of FLEB14 cells, an Epstein-Barr virus-transformed B cell precursor containing the germ line immunoglobulin genes, gave rise to a uniclonally expanded variant, FLEB14 delta 3, which was rearranged at the immunoglobulin heavy-chain gene locus. Cytogenetic analysis showed that FLEB14 delta 3 had a novel reciprocal translocation, t(6;14)(q15;q32). Molecular cloning of the rearranged DNA fragments and determination of their nucleotide sequence revealed that the recombination event was reciprocal, imprecise, and nonhomologous and took place in the S mu region, like those found in Burkitt's lymphoma cells.

Sarothralen A and B, new antibiotic compounds from Hypericum japonicum.

Two antibiotic compounds, sarothralen A and sarothralen B, from Hypericum japonicum Thunb. ( Sarothra japonica Thunb.) have been isolated and their structures were elucidated on the basis of spectroscopic data.

Non-invasive detection of coronary artery disease by body surface electrocardiographic mapping after dipyridamole infusion.

Electrocardiographic changes after dipyridamole infusion (0.568 mg/kg/4 min) were studied in 41 patients with coronary artery disease and compared with those after submaximal treadmill exercise by use of the body surface mapping technique. Patients were divided into three groups; 19 patients without myocardial infarction (non-MI group), 14 with anterior infarction (ANT-MI) and eight with inferior infarction (INF-MI).

Body surface distributions of ST segment changes after exercise in effort angina pectoris without myocardial infarction.

To investigate the sites of exercise-induced ST segment changes on the body surface in effort angina pectoris without myocardial infarction, we performed 87-lead ECG mapping in 61 patients before and 1.5 and 5 minutes after treadmill exercise. ST segment depression most often occurred in the left anterior chest leads and ST segment elevation developed mainly in the right upper chest leads.

Detection of local abnormalities in ventricular activation sequence by body surface isochrone mapping in patients with previous myocardial infarction.

Body surface isochrone mapping was performed in 36 normal subjects and in 85 patients with previous myocardial infarction. Eighty-seven unipolar electrocardiograms distributed over the anterior chest and the back were recorded simultaneously. For each lead, activation time was measured as the time from the onset of QRS to the peak of the R wave.

The clinical significance of exercise-induced ST-segment elevation in previous anterior myocardial infarction.

To investigate the mechanism of exercise-induced ST elevation in previous anterior myocardial infarction, exercise body surface mapping was performed on 22 patients with anterior myocardial infarction. ST elevation was compared with the findings of exercise radionuclide ventriculography and exercise thallium-201 myocardial perfusion imaging. ST-segment was quantified by the integral of ST-segment voltage.

Diagnosis of coronary artery disease by body surface mapping--body surface distribution of exercise-induced ST changes in patients without myocardial infarction.

In 36 patients with effort angina pectoris without myocardial infarction, the sites of exercise-induced ST changes (depression and elevation) on the body surface were investigated. Exercise-induced ST depression was most often seen in left anterior chest leads. The body surface distribution of ST depression failed to identify the obstructed coronary artery.

Characterization of a rat tRNA gene cluster: comparison of nucleotide sequences of the gene for tRNALeu newly found in repeating units.

In the rat, DNA carrying a cluster of the genes for tRNAAsp, tRNAGly, and tRNAGlu, aligned in that order, is repeated about 10 times. Seven DNA clones corresponding to the independent repeating units were isolated from a rat gene library. Nucleotide sequence analysis of these clones revealed the presence of a fourth tRNA gene, the gene for tRNALeu, in the cluster.

Noninvasive assessment of left ventricular wall motion abnormalities by QRS isointegral maps in previous anterior infarction.

In order to determine to what extent left ventriculographic abnormalities can be predicted from ECG changes in myocardial infarction (MI), 87 unipolar ECGs were simultaneously recorded in 22 patients with previous anterior MI with no conduction defects. We adopted a QRS isointegral mapping technique for analyzing body surface mapping data. Particular attention was given to the area where the QRS time-integral value was less than the lower limit (mean minus two standard deviations) of the normal, and this area was designated as the departure area.