In this work, a multiband log-periodic dipole array (LPDA) antenna, which can operate between 0.5 GHz and 4 GHz, is designed for microwave imaging applications. Design includes two steps. In the ...first step, LPDA antenna design is achieved by means of several simulations. In the next step, the lengths of each dipole is reduced to obtain a smaller antenna. For this purpose, each dipole is shortened with the microstrip lines, which are printed on the back of the antenna. In the design process, specific reflection coefficient, VSWR, gain and radition pattern are considered as the main goals. Designed antenna is printed on a FR4 substrate and simulation results are compared with the measured data.
Percutaneous coronary intervention (PCI) of saphenous vein grafts (SVGs) is associated with an increased risk of complications, particularly no‑reflow phenomenon and distal embolization due to low ...patency rates. The CHA2DS2‑VASc score is a clinical risk stratification tool used to predict thromboembolism events especially in patients with nonvalvular atrial fibrillation.
The aim of this study was to investigate the relationship between the CHA2DS2‑VASc score and no‑reflow phenomenon after SVG PCI in patients with non-ST‑segment elevation acute coronary syndromes (NSTE‑ACS).
In this study, we included 268 patients diagnosed with NSTE‑ACS who underwent PCI for SVG disease in our tertiary cardiovascular center. Patients were divided into 2 groups: group 1 without no‑‑reflow phenomenon (n = 190) and group 2 with no‑reflow phenomenon (n = 78) following the intervention, and then compared based on CHA2DS2‑VASc scores.
The CHA2DS2‑VASc score (P <0.001) was significantly higher in group 2, even though no significant difference regarding atrial fibrillation was observed between the study groups. The CHA2DS2‑VASc score (P <0.001), degenerated saphenous vein graft (P = 0.006), and intraluminal thrombus (P <0.001) were found to be independent predictors of no‑reflow phenomenon. Receiver operating characteristics analysis showed that a CHA2DS2‑VASc score of 4 predicted no‑reflow phenomenon with 67.9% sensitivity and 69.3% specificity.
Our findings suggest that the CHA2DS2‑VASc score can be an independent predictor of no‑reflow phenomenon in patients undergoing SVG interventions. As a simple and easy‑to‑calculate score, it might be a useful assessment tool to predict no‑reflow phenomenon before SVG interventions in patients with NSTE‑ACS.
High frequency adventitious shoot regeneration in sainfoin Oezgen, M. (Ankara Univ. (Turkey). Faculty of Agriculture, Dept. of Field Crops); Oezcan, S; Sevimay, C.S ...
Plant cell, tissue and organ culture,
(1998), 1998, Letnik:
52, Številka:
3
Journal Article
Immature cotyledons and embryo axes of sainfoin were cultured on Murashige and Skoog (MS) media supplemented with various concentrations of 6-benzylaminopurine (BAP) and alpha-naphthaleneacetic acid ...(NAA) to induce adventitious shoot regeneration. The highest frequency of shoot regeneration occurred following an initial callus growth on a MS medium containing 0.5 mg/l BAP and 2 mg/l NAA. Immature embryo axes showed higher regeneration capacity than immature cotyledons, however, shoot elongation was best achieved on immature cotyledons. Regenerated shoots were excised and rooted in half strength MS medium with 1 mg/l indole-butyric acid (IBA) or 1 mg/l NAA. The rooted plantlets were finally transferred to compost.
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