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Search Results: 1 - 10 of 3445 matches for " Natalia Zienczuk "
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Association between socioeconomic status and overweight and obesity among Inuit adults: International Polar Year Inuit Health Survey, 2007–2008
Natalia Zienczuk,Grace M. Egeland
International Journal of Circumpolar Health , 2012, DOI: 10.3402/ijch.v71i0.18419
Abstract: Objectives. To evaluate the socio-economic correlates of overweight and obesity among Inuit undergoing rapid cultural changes. Study design. A cross-sectional health survey of 2,592 Inuit adults from 36 communities in the Canadian Arctic. Methods. Main outcome measures were overweight and obesity (BMI>25 kg/m2 and >30 kg/m2, respectively) and as characteristics were similar, groups were combined into an at-risk BMI category (BMI>25 kg/m2). Logistic regression was used to determine the association between various sociodemographic characteristics and physical activity with overweight and obesity. Results. The prevalence of overweight and obesity was 28 and 36%, respectively, with a total prevalence of overweight and obesity of 64%. In analyses of sociodemographic variables adjusted for age, gender and region, higher education, any employment, personal income, and private housing were all significantly positively correlated with an at-risk BMI (p≤0.001). Smoking, Inuit language as primary language spoken at home, and walking were inversely associated with overweight and obesity. Conclusions. The current findings highlight the social disparities in overweight and obesity prevalence in an ethnically distinct population undergoing rapid cultural changes.
Dietary correlates of an at-risk BMI among Inuit adults in the Canadian high arctic: cross-sectional international polar year Inuit health survey, 2007-2008
Zienczuk Natalia,Young T,Cao Zhirong R,Egeland Grace M
Nutrition Journal , 2012, DOI: 10.1186/1475-2891-11-73
Abstract: Background The study’s objective was to investigate the dietary correlates of an at-risk body mass index (BMI) among Inuit adults from thirty-six communities across the Canadian Arctic using data from the cross-sectional International Polar Year Inuit Health Survey, conducted in 2007–2008. Methods The survey included assessments of 24-hr dietary recall, sociodemographics, physical activity, and anthropometry. Dietary characteristics of overweight and obesity were similar and therefore combined into one at- risk BMI category (≥25 kg/m2) for analyses. The relationship between an at-risk BMI and energy intake from macronutrients, high sugar drinks, high-fat foods, saturated fatty acids, and traditional foods were examined entering each dietary variable separately into a logistic regression model as an independent variable. Analyses were adjusted for age, sex, region, kcalories, walking, smoking and alcohol consumption. Further multivariable models considered selected dietary variables together in one model. Results An at-risk BMI was present for 64% with a prevalence of overweight and obesity of 28% and 36%, respectively. Consumption of high-sugar drinks (>15.5% E) was significantly related with having an at-risk BMI (OR = 1.6; 95% CI 1.2; 2.2), whereas the % E from total carbohydrate evaluated as a continuous variable and as quartiles was inversely related to an at-risk BMI (P -trend < 0.05) in multivariable analyses. While % E from high-fat foods was positively related to an at-risk BMI, the findings were not significant in a model controlling for high-sugar drinks and % E from carbohydrates. Conclusions The prevalence of overweight and obesity is of public health concern among Inuit. The current findings highlight the obesogenic potential of high-sugar drink consumption in an ethnically distinct population undergoing rapid cultural changes and raises concerns regarding carbohydrate restricted diets. Health promotion programs aimed at preventing the development of an unhealthy body weight should focus on physical activity and the promotion of healthy diets with reduced intake of sugar drinks.
Effect of Stacking Fault Energy on the Mechanism of Texture Formation during Alternating Bending of FCC Metals and Alloys  [PDF]
Natalia Shkatulyak
International Journal of Nonferrous Metallurgy (IJNM) , 2013, DOI: 10.4236/ijnm.2013.22005
Abstract:

Alternating bending shear stresses lead to the formation of twin orientations in the texture of FCC materials with middle and low stacking fault energy (SFE). Only in the stainless steel with a low SFE during alternating bending with different number of cycles components of shear texture {111}; {hkl}<110>; {001}<110> were formed. Copper (middle SFE), along with orientations of twinning and cubic texture formed orientation of deformation {135}<211>. During alternating bending of aluminum (high SFE), a dynamic recovery occurred. The share of initial cubic texture increases with the increase of number of cycles of alternating bending and reaches its maximum after three cycles. Share of component of texture Goss increased slightly. The most significant change of the microstructure and texture occurred during the first 3 - 5 cycles

Pseudo Jahn-Teller Effect in Puckering and Planarization of Heterocyclic Compounds  [PDF]
Natalia Gorinchoy
International Journal of Organic Chemistry (IJOC) , 2018, DOI: 10.4236/ijoc.2018.81010
Abstract: The goal of this brief partly review paper is to summarize the results of the works published over the last few years regarding the origin of the out-of-plane distortions (puckering) of heterocyclic compounds. In all the papers devoted to this problem, it is shown that the instability of planar configurations of heterocyclic molecules leading to symmetry breaking and distortions is induced by the pseudo Jahn-Teller effect (PJTE). Special attention in this work is paid to the mechanism of suppression and enhancement of the PJTE distortions of heterocycles by oxidation, reduction, and chemical substitutions. It is demonstrated that oxidation of 1,4-dithiine containing compounds leads to suppression of the PJTE and to restoration of their planar nuclear configurations. An example of a dibenzo[1,2]dithiine molecule is used to demonstrate the mechanism of enhancement of the PJTE by reduction. It is shown that the reduction of the neutral C12H8S2 molecule up to the dianion (C12H8S2)2- enhances the PJTE, followed by the S-S bond cleavage and significant structural distortions of the system. The change of the PJTE by chemical substitutions, accompanied either by puckering or by planarization of heterocyclic compounds, is discussed using as examples 1,4-ditinine and its S-oxygenated derivatives.
Different behavior of protein B23/nucleophosmin and UBF in HeLa cells during apoptosis  [PDF]
Natalia M. Vladimirova, Natalia A. Potapenko
Journal of Biophysical Chemistry (JBPC) , 2011, DOI: 10.4236/jbpc.2011.24049
Abstract: The behavior of UBF (upstream binding factor) and nucleophosmin in HeLa and HeLa-Bcl-2 cells during apoptosis induced by TNF-α, emetine, and their mixture was investigated. A pronounced apoptosis was achieved only in HeLa cells treated with a mixture of the inducers. Immunoblotting analysis of UBF and nucleophosmin in samples containing different portions of cells with apoptotic nuclei was carried out. It showed that UBF was proteolytically cleaved giving a stable 76-kDa fragment. Increasing content of the fragment during apoptosis correlated with the level of cells containing apoptotic nuclei and with a decrease in the content of full-sized UBF. Determination of N- and C-terminal sequences of UBF and 76-kDa fragment allowed us not only to characterize UBF at the protein level, but also to describe the site of the apoptosis-specific proteolysis. Nucleophosmin did not undergo proteolytic cleavage during apoptosis and its content was unchanged even in a sample containing 100% of cells with apoptotic nuclei. However in cells reached terminal stages of apoptosis, the balance between mono- and oligomeric forms of nucleophosmin changed due to depletion of monomeric forms and appearance of two additional oligomeric forms with lower molecular weight.
The Digital Fingerprinting Method for Static Images Based on Weighted Hamming Metric and on Weighted Container Model  [PDF]
Sergey Bezzateev, Natalia Voloshina
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.29016
Abstract:

The algorithm of fingerprint constructing for still images based on weighted image structure model is proposed. The error correcting codes that are perfect in weighted Hamming metric are used as a base for fingerprint constructing.

Twin Reverse Arterial Perfusion (TRAP): Case Report  [PDF]
Natalia Adamou, Ibrahim Yakasai
Open Journal of Obstetrics and Gynecology (OJOG) , 2014, DOI: 10.4236/ojog.2014.416147
Abstract: The twin reversed arterial perfusion (TRAP) sequence is an anomaly unique to monochorionic multiple pregnancies. It is a rare complication. We present a case of acardius anephus, which was mistaken for a live anomalous singleton fetus. A 21-year-old unbooked Primigravida was seen in labour ward with a ten hours history of labour pains. Urgent transabdominal ultrasound revealed a singleton live fetus at 30 weeks gestation with gross cystic mass lesion at the level of the abdomen and polyhydramnious. Caesarean section confirms a twin gestation with monoamniotic monochorionic single placenta. The umbilical cord of the acardiac twin was short—First twin was a live female baby, weighing 1000 g. TRAP is a rare event an early referral to feto maternal unit will improve perinatal outcome.
Efficient Density Estimation and Value at Risk Using Fejér-Type Kernel Functions  [PDF]
Olga Kosta, Natalia Stepanova
Journal of Mathematical Finance (JMF) , 2015, DOI: 10.4236/jmf.2015.55040
Abstract:

This paper presents a nonparametric method for computing the Value at Risk (VaR) based on efficient density estimators with Fejér-type kernel functions and empirical bandwidths obtained from Fourier analysis techniques. The kernel-type estimator with a Fejér-type kernel was recently found to dominate all other known density estimators under the \"\"-risk, \"\". This theoretical finding is supported via simulations by comparing the quality of the density estimator in question with other fixed kernel estimators using the common \"\"-risk. Two data-driven bandwidth selection methods, cross-validation and the one based on the Fourier analysis of a kernel density estimator, are used and compared to the theoretical bandwidth. The proposed nonparametric method for computing the VaR is applied to two fictitious portfolios. The performance of the new VaR computation method is compared to the commonly used Gaussian and historical simulation methods using a standard back-test procedure. The obtained results show that the proposed VaR model provides more reliable estimates than the standard VaR models.

Seasonal Composition of Lipids, Fatty Acids Pigments in the Brown Alga Sargassum pallidum: The Potential for Health  [PDF]
Natalia Gerasimenko, Stepan Logvinov
Open Journal of Marine Science (OJMS) , 2016, DOI: 10.4236/ojms.2016.64041
Abstract: The present study describes the content of total lipids (TL), the main components of polar and neutral lipids (NL) and photosynthetic pigments (PSP) in edible seaweed Sargassum pallidum (Ochrophyta) from the Sea of Japan, Russia, in different months of the year, taking into account life cycle. Special attention was paid to the fatty acids (FAs) of total lipids as well as the accumulation of important polyunsaturated fatty acids (PUFAs) in glyceroglycolipids (GL) and reserve lipids in the seasonal cycles of growth. The content of TL strongly varied in the course of a year. The major lipid components were GL (20.3% - 36.4%) and NL (19.8% - 30.6%), while phospholipids (PL) were present in negligible amounts (3.2% - 6.9%). Significant seasonal variations were observed in content all classes of lipids. The PUFAs prevailed in total lipids and the content of n-6 PUFAs was higher than n-3 PUFAs on all stages of life with the exception of vegetation period. Monogalactosyldiacylglycerols (MGDG) and digalactosyldiacylglecerols (DGDG) were rich in PUFAs and n-3 PUFAs were dominated among them independently of stages of growth. Saturated fatty acids (SFA) were dominated in sulfoquinovosyldiacylglycerols (SQDG). Triacylglycerols (TAG) and diacylglycerols (DAG) contained many PUFAs, especially n-6 PUFAs. Significant concentration 20:3 n-6 was in the triacylglycerols. The concentration of chlorophylls and carotenoids was increased with the growth and maturation of S. pallidum and reached maximum in period of highest day length and water temperature. The content of pigments decreased with the onset of
Mini OPCAB Mammary to Left Anterior Descending Artery  [PDF]
Federico Benetti, Natalia Scialacomo
Surgical Science (SS) , 2017, DOI: 10.4236/ss.2017.89044
Abstract: Introduction: Here we will describe the actual surgical technique to perform the left mammary artery bypass to the left anterior descending artery, and the results of this operation in the Benetti Foundation in the last 20 years. Materials and Methods: The inclusion criteria for this operation were patients with a demonstrated predominant ischemia by functional test. In the patients with double, triple vessels disease or left main, the age was more than 65 years or and Euro score Risk of surgery of more than 4. The exclusion criteria were patients with more areas of ischemia and lesions that involved a considerable territory apart from the Lad and good candidates for surgery are younger than 65 years or the Euro score Risk of surgery were less than 4. Seventy patients were operated in the Foundation through LIMA to LAD Anastomosis with the MINI OPCABG technique. The average Preoperative Risk Euroscore was 3,5. Surgical Technique after open the lower part of the sternum, the left mammary artery is dissected around 8 cm. The pericardium is open and the mammary is connected to the left anterior descending. Results: Operative mortality in this series was 0%. One patient was converted to sternotomy Off Pump (1, 4%). None of the grafts were revised after the measure with the Medistim System. 55 (79%) were extubated in the operating room. The average Hospitalization stay were 60 hours (D +_17 ci 95%), 16 patients with Lima to LAD were restudied in the initially experience with 100% patency, at 144 months, 82% of the patients were alive and 68% asymptomatic. Conclusion: More clinical experience is important to find the definitive indications of this technique; and better technologies are required to be able to standardize this operation in definitive form.
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