Erratum: High-Fidelity Bidirectional Nuclear Qubit Initialization in SiC [Phys. Rev. Lett. 117, 220503 (2016)].

This corrects the article DOI: 10.1103/PhysRevLett.117.

High-Fidelity Bidirectional Nuclear Qubit Initialization in SiC.

Dynamic nuclear polarization (DNP) is an attractive method for initializing nuclear spins that are strongly coupled to optically active electron spins because it functions at room temperature and does not require strong magnetic fields. In this Letter, we theoretically demonstrate that DNP, with near-unity polarization efficiency, can be generally realized in weakly coupled electron spin-nuclear spin systems. Furthermore, we theoretically and experimentally show that the nuclear spin polarization can be reversed by magnetic field variations as small as 0.

Optical Polarization of Nuclear Spins in Silicon Carbide.

We demonstrate optically pumped dynamic nuclear polarization of (29)Si nuclear spins that are strongly coupled to paramagnetic color centers in 4H- and 6H-SiC. The 99%±1% degree of polarization that we observe at room temperature corresponds to an effective nuclear temperature of 5  μK. By combining ab initio theory with the experimental identification of the color centers' optically excited states, we quantitatively model how the polarization derives from hyperfine-mediated level anticrossings.

[Unusual laparoscopic surgical cases: cholelithiasis in situs inversus totalis, and gallbladder agenesis].

Organ anomalies and organ system transposition may cause diagnostic and therapeutic difficulties. We report a patient with situs inversus totalis and symptomatic cholelithiasis successfully treated via laparoscopic cholecystectomy. We present a laparoscopic and MR cholangiographic pictures of our patient with gallbladder agenesis.

[Decreased bone mineral density as a risk factor in the development of spinal deformities in neurofibromatosis].

Neurofibromatosis-1 is a here-do-familiar disorder that is associated with a variety of skeletal anomalies, mostly with spinal deformities in 10-50% of the patients. Intraoperatively, a poor vertebral bone quality has been observed. Efforts have been made to identify factors preventing curve progression, to optimize operational planning and to explain the pathomechanism.

[Results of parathyroidectomy for primary hyperparathyroidism].

We have performed 16 operations on 14 patients with primary hyperparathyoidism caused by a solitary parathyroid adenoma in our department between 1st jan. 1990-31 dec. 1999.

Epidemiology of congenital coronary artery anomalies: a coronary arteriography study on a central European population.

The anatomical patterns and frequency of occurrence of congenital coronary anomalies (CCA) in a Central European cohort has not yet been studied. The angiographic data of 7,694 consecutive patients undergoing coronary arteriography at the Albert Szent-Györgyi Medical University, Szeged, Hungary, from 1984 to 1994 were analyzed. CCA were found in 103 patients (1.

[Coronary angiography causing coronary embolism and subsequent cardiogenic shock: treatment by intraaortic balloon pumping].

A case is presented where coronarography was complicated by coronary embolism. The acute circulatory failure could be controlled only by intraaortic balloon pump therapy. The authors emphasize the importance of the mechanical circulatory support devices in the cardiac catheterization laboratories as well as at the coronary care units.

[Value of the ejection fraction in patients with right ventricular necrosis during the rehabilitation period].

The right ventricular ejection fraction was determined in 58 patients with simultaneous right and left ventricular myocardial infarction and in 77 patients with only left ventricular myocardial infarction. The results were analysed in four groups of patients (patients with anterior, anterior and right ventricular, posterior, posterior and right ventricular myocardial infarction). Furthermore, the relation between left and right ventricular ejection fraction, stress capacity and heart volume was investigated.

[Evaluation of hemodynamic parameters in patients with right ventricular infarction during rehabilitation].

Hemodynamic data in 43 patients with right and left ventricular infarction and 39 with left ventricular infarction were compared. Right atrial pressure, pulmonary capillary wedge pressure, mean pulmonary artery pressure, left ventricular end-diastolic pressure before and after ventricular angiogram, cardiac index, left ventricular stroke volume index, right ventricular stroke work index were evaluated, as well as ratios of right atrial and pulmonary capillary wedge pressure, right and left ventricular end-diastolic pressure, right ventricular end-diastolic and pulmonary capillary wedge pressure, left ventricular ejection fraction calculated from left ventricular angiogram, Berentey's score, and cardiac volume index. Using ONEWAY analysis there was no significant difference between the two groups in period of rehabilitation.

[False positive results of exercise tests with thallium myocardial scintigraphy].

The authors have examined supposed causes of positive Th-201 stress scintigraphy. Patients were divided into two groups according to the presence of exercise-induced transitory hypoperfusion or in absence of it. In both groups negative coronarograms were verified.

Haemodynamic effect of nitroglycerin spray.

1. It is a reliable nitroglycerin (NTG) form influencing circulation and haemodynamics like other nitroglycerin products, 2. It is easily applicable, 3.

[Angina pectoris, provocable by exercise, and silent myocardial ischemia in the light of results of coronary angiography].

Correlation between coronary anatomy and the presence or absence of chest pain was studied during bicycle exercise testing in 101 patients. All of them had significant ST segment depression during the stress test. ECG changes were accompanied by chest pain in 66 patients (group A).

[Normalization of the ECG in right heart infarct].

A 6-month ECG follow-up was carried out in 65 patients with right-ventricular infarction accompanied by anterior (n = 17) and inferior (n = 48) left-ventricular necrosis. QRS morphology and ST-segment alterations were evaluated in the period of rehabilitation and 6 months later. By the end of the 6th month, QRS in V3-4R returned to normal in 12 patients (18%), and there was no ST elevation in any of the patients at that time.

[Normalization of ECG after right ventricular infarct].

6-month ECG follow-up was carried out in 65 patients with right ventricular infarction accompanied by anterior (n = 17) and inferior (n = 48) left ventricular necrosis. QRS morphology and ST segment alterations were evaluated in the period of rehabilitation and 6 months later. By the end of the 6th month QRS in V3-4R returned to normal in 12 patients (18%) and there was no ST elevation in none case by this time.

[Isolated right ventricular infarction].

Generally, right ventricle infarction is accompanied by left ventricle infarction. Isolated right ventricle necrosis is rare. Among 1707 patients with 6-week-old myocardial infarction there were 2 cases with isolated right ventricle infarction.

[Septal Q wave responses to exertion in the diagnosis of proximal stenosis of the anterior descending coronary artery].

In 29 patients with coronary artery disease (CAD) involving the proximal segment of left anterior descending coronary artery (LAD) and in 25 patients with normal coronary anatomy (control group) Q wave amplitude changes were studied in response to exercise with bicycle and treadmill. Decrease of the Q wave amplitude was observed only in the patient group. Increase in amplitude was found only in the control group.

[Stress tolerance in patients with right ventricular infarct during the rehabilitation period].

199 patients with myocardial infarction were divided into 4 groups according to the localisation of necrosis (anterior, inferior, anterior + right ventricle, inferior + right ventricle). Exercise capacity was determined by bicycle ergometer test at the beginning of rehabilitation and 3 weeks later. Exercise capacity and ejection fraction were better in case of inferior comparing with anterior infarction.

[The normal right-side electrocardiogram].

QRS complex, ST segment and T wave were investigated in V1R--V8R right chest wall leads in 122 healthy individuals (76 women, 46 men, mean age: 36.8 years). There was no Q wave in V1-3R.

[Experience with the Matti-Russe-Zolczer method in the surgical management of pseudoarthrosis of the navicular bone of the wrist].

Authors performed in the Department of Traumatology of the County Hospital Kaposvár from 1979 to 1985 22 Matti-Russe-Zolczer operations for pseudoarthrosis of the navicular bone. The necessity of the strict observance of the conditions of indication is stressed. The results of operations were assessed in a follow-up.

[ECG and coronarographic signs of an anterior wall myocardial infarct accompanied by a right ventricular infarct in the rehabilitation phase].

QRS-complex and ST-segment were analyzed by ECG using 12 routine leads in three right chest wall leads (V3R, V4R, V5R) in patients with chronic anterior wall myocardial infarction. A QRS-complex was found in leads V3R and V4R in proximal occlusion of the LAD in all (n = 22) but four patients, where retrograde filling of the septal branch of the LAD was observed. When the medial LAD was occluded (n = 13), rS-complex was present in the right chest wall leads.

[Tocolysis with clenbuterol tablets].

The authors report on the results of treatment of threatening premature labour with clenbuterol. The daily dose was 40 micrograms twice and later 20 micrograms twice with good efficiency. Action of clenbuterol relating to tocolysis, metabolism and cardiovascular system has been compared with fenoterol-perlongettes.