| 1. |
- Wang, F., et al.
(author)
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Silicon intercalation into the graphene-SiC interface
- 2012
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In: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121. ; 85:16
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Journal article (peer-reviewed)abstract
- In this work we use low-energy electron microscopy, x-ray photoemission electron microscopy, and x-ray photoelectron spectroscopy to study how the excess Si at the graphene-vacuum interface reorders itself at high temperatures. We show that silicon deposited at room temperature onto multilayer graphene films grown on the SiC(000 (1) over bar) rapidly diffuses to the graphene-SiC interface when heated to temperatures above 1020 degrees C. In a sequence of depositions, we have been able to intercalate similar to 6 ML of Si into the graphene-SiC interface.
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| 2. |
- Ibrahimi, P., et al.
(author)
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Enlarged left atrium and increased basal heart rate predict exercise capacity in heart failure patients
- 2017
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In: European Journal of Heart Failure. - : European Society of Cardiology. - 1388-9842 .- 1879-0844. ; 19:S1, s. 582-583
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Journal article (peer-reviewed)abstract
- Background and aim: Heart failure (HF) is a major and growing health problem characterized by high mortality, frequent hospitalization, reduced quality of life and a complex therapeutic regimen. Six minute walking test (6-MWT) may serve as a reproducible test for assessing exercise capacity in HF patients and can be clinically predicted. The aim of this study was to assess clinical, biochemical and echocardiographical predictors of limited exercise capacity in HF patients.Methods: The study subjects were 135 consecutive clinically stable HF patients (64±11 years, 66 [47%] female, classified as NYHA I-III). Echocardiography, including tissue Doppler measurements, was performed in all patients. A six minute walk test (6-MWT) distance was performed in all patients, who were divided into two groups based on the 6-MWT distance (Group I: ≤ 300 m and Group II: >300 m).Results: Patients with limited exercise performance (≤ 300 m) were older (p<001), more frequent female (p=0.007) and diabetics (p=0.003), had lower level of hemoglobin (p=0.02), larger left atrium (LA, p=0.003), higher basal heart rate (p=0.009), higher E/e’ ratio (p=0.01) and lower septal systolic myocardial velocity (p=0.03) compared with good performance patients. Enlarged LA [2.856 (1.439-5.666), p=0.003], older age [1.110 (1.036-1.188), p=0.003], increased basal heart rate [1.055 (1.012-1.099), p=0.012] and the presence of diabetes [3.321 (1.022-10.796), p=0.046] independently predicted poor 6-MWT performance.Conclusions: In patients with HF, the limited exercise capacity assessed by 6-MWT, is related mostly to the enlarged left atrium as e reflection of longstanding increased left ventricular filling pressure, increased basal heart rate, in addition to the older age and the presence of diabetes. These findings highlights the need of the optimal medical treatment of HF patients towards the decreasing LV filling pressure and heart rate.
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| 3. |
- Oláh, János, et al.
(author)
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Lineage sorting by parameres in Limnephilinae subfamily (Trichoptera): with description of a new tribe, new genera and new species
- 2019
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In: Opuscula Zoologica Instituti Zoosystematici et Oecologici Universitatis Budapestinensis. - 0237-5419 .- 2063-1588. ; 50:S1, s. 3-98
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Journal article (peer-reviewed)abstract
- The discovery of the new Agaphylax genus with unique paramere organisation has initiated our lineage sorting oftribes by parameres in the Limnephilinae subfamily applying the principles and procedures of fine phenomics in order toestablish transformation series of the polarized plesiomorphy-apomorphy character states for each limnephiline genera.According to the extraordinary high diversity the paramere that is the stimulatory and titillating structure of the phallic organis a speciation supertrait. This adaptive trait is directly involved in the processes of reproductive isolation and diverging assubtle initial split of lineages producing the incipient sibling species in the recent past of contemporary speciation processes.Contrary, the drastic divergence of the Agaphylax plated paramere is much older, similarly to the many-spined parameres ofthe Hesperophylacini tribe. It has been initiated by drastic combined and synchronous external and internal stochastic effects,processed in ancestral sexual integrative adaptation as well as organised and fixed in older and deeper coalescence events andappears as a character with tribe ranking potential. To open a wider perspective, a systemic relational analysis is required inthe future including other adaptive or neutral character transformation series, due to the burden of taxonomic incongruencesgrounded by chimerism in stochastic genetic reticulation. Traits of species are mixed products coming from various sources.Only character combinations can and ought to be analysed in terms how to classify taxa. We have polarized eight genitaliccharacters additional to parameres for a future analysis of the potential of character combinations.Limnephilinae subfamily is composed of Limnephilini, Chilostigmatini, Chaetopterygini, Stenophylacini and Hesperophylacinitribes and here we established the new Agaphylacini tribe. Based on parameres we have delineated taxa in lineagesorting and described two new genera: Fogophylax gen. nov., Simaphylax gen. nov. and fourteen new species: Anaboliaalsoja, A. hepehupa, Asynarchus kimaros, Limnephilus kerekes, L. maghrebensis, L. oblos, Homophylax beges, H. coros,Chaetopteroides plackovicensis, C. rilaensis, Allogamus ketpar, Platyphylax beshkovi, Pycnopsyche letova and P. telea spp.nov. The by-product of this survey is a world atlas of paramere drawings for the entire Limnephilinae subfamily.
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| 4. |
- Percuku, L., et al.
(author)
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The exaggerated systolic hypertensive response to exercise predicts cardiovascular events : a systematic review and meta-analysis
- 2018
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In: European Heart Journal. - : Oxford University Press. - 0195-668X .- 1522-9645. ; 39, s. 869-869
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Journal article (other academic/artistic)abstract
- Background: Exercise stress testing is mainly used for the assessment of coronary artery disease (CAD), with blood pressure (BP) measurements routinely obtained during the test. In healthy individuals, the increased cardiac output with exercise is associated with perpetual increase in systolic BP (SBP). The pathophysiology of exaggerated hypertensive response to exercise (HRE is not fully understood and the role of HRE in predicting cardiovascular (CV) events is contradictory.Aim: The aim of this meta-analysis therefore, was to analyze the role of HRE in predicting CV clinical outcomes in healthy normotensive subjects.Methods: We searched Pubmed-MEDLINE, Cochrane Library, Refworks and Google Scholar aiming to find clinical studies which reported data on CV event rate and outcomes (including mortality) for patients who underwent exercise testing and had HRE. Sensitivity and specificity (with 95% CI) analysis for assessing the diagnostic accuracy of HRE cut-off that predicts CV events was estimated using hierarchical summary receiver operating characteristic analysis.Results: Eight studies with 47,188 participants were included with a median follow-up duration of 19.3 months. Significantly higher HRE was found in patients with composite events (HR = 1.363 [1.135–1.604]; p<0.001), in those who developed coronary artery events (HR = 1.532 [1.240–1.893]; p<0.001) and CV mortality (HR = 1.286 [1.075–1.539]; p=0.006) compared to normal response patients. An exercise systolic BP of 196 mmHg predicted CV events with sensitivity of 62% (54–69%) and specificity of 75% (60–86%) with positive likelihood ratio (LR+) <3 and strong correlation (r=-0.71).Conclusion: This meta-analysis supports the clinical relevance of exaggerated blood pressure response to exercise (systolic BP >196 mmHg) as a predictor of composite and CV clinical outcome. These findings should be taken as a thought provoking evidence for finding better stratification of such patients and consequently optimum management for this risky group.
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