Bulunan: 11 Adet 0.001 sn
Effect of air bubbles localization and migration after embryo transfer on assisted reproductive technology outcome

Fıçıcıoğlu, C. | Özcan, P. | Koçer, M.G. | Yeşiladalı, M. | Alagöz, O. | Özkara, G. | Altunok, Ç.

Article | 2018 | Fertility and Sterility109 ( 2 ) , pp.310 - 3140

Objective: To evaluate the effect of embryo flash position and movement of the air bubbles at 1 and 60 minutes after ET on clinical pregnancy rates (PRs). Design: Prospective clinical trial. Setting: University fertility clinic. Patient(s): A total of 230 fresh ultrasound-guided ETs performed by a single physician (C.F.) at the IVF center of Yeditepe University Hospital between September 2016 and February 2017 were included. Intervention(s): Transabdominal ultrasonographic guidance at ET. Main Outcome Measure(s): Clinical PRs. Result(s): There was no significant difference in terms of clinical PRs between women with embryo flash loc . . .ated >15 mm and Daha fazlası Daha az

CO2 Capturing Materials

Davran-Candan, T.

Book Part | 2018 | Comprehensive Energy Systems02.05.2020 , pp.881 - 912

Carbon capture and sequestration (CCS) emerges as a viable option for reducing atmospheric CO2 concentrations required for the mitigation of global warming and a sustainable energy future. The first step of CCS, which is the separation of CO2 from flue gas, is still very expensive limiting its use for industrial scale operations; so there is an extensive research going on, for the development of feasible capture materials. This chapter aims to provide a basic understanding about the current status and future directions of this search, providing an extensive literature review about the subject in addition to an illustrative example t . . .hat comparatively analyses materials for a better understanding of the factors affecting the adsorption capacity. © 2018 Elsevier Inc. All rights reserved Daha fazlası Daha az

Volumetric Muscle Measurements Indicate Significant Muscle Degeneration in Single-Level Disc Herniation Patients

Yaltırık, K. | Güdü, B.O. | Işık, Y. | Altunok, Ç. | Tipi, U. | Atalay, B.

Article | 2018 | World Neurosurgery116 , pp.881 - 912

Background: There is a strong relationship between lower back pain and paraspinal muscle atrophy. In this study, we aimed to investigate the prevalence of lumbar paravertebral muscle atrophy in patients with and without single-level disc herniation. Methods: The 110 retrospectively analyzed patients in this study were divided into 2 groups. Group A included 55 patients with radiologically confirmed single-level disc herniation with back pain and radiculopathy. Group B included 55 patients with back pain without radiologic lumbar disc herniation. The paravertebral muscle cross-sectional areas were measured in both groups by 2 indepen . . .dent observers. Results: In total, 68 women and 42 men were examined. Their mean age was 40.85 years old. The mean ages of groups A and B were 42.49 and 39.22 years, respectively. The cross-sectional areas of the multifidus muscles (MM) and erector spinae muscles were significantly greater in group B than in group A (P < 0.0001). However, there were no statistically significant differences in the psoas major cross-sectional areas, disc heights, and perpendicular distances between the MM and the laminae. Conclusions: The MM and erector spinae muscle groups are innervated by the dorsal root of the spinal nerve arising from the same level; therefore, long-term pressure on the root caused by disc herniation can cause atrophy and degeneration of that muscle group. © 2018 Elsevier Inc Daha fazlası Daha az

Dynamical analysis of a two prey-one predator system with quadratic self interaction

Aybar, I.K. | Aybar, O.O. | Dukaric, M. | Fercec, B.

Article | 2018 | Applied Mathematics and Computation333 , pp.118 - 132

In this paper we investigate the dynamical properties of a two prey-one predator system with quadratic self interaction represented by a three-dimensional system of differential equations by using tools of computer algebra. We first investigate the stability of the singular points. We show that the trajectories of the solutions approach to stable singular points under given conditions by numerical simulation. Then, we determine the conditions for the existence of the invariant algebraic surfaces of the system and we give the invariant algebraic surfaces to study the flow on the algebraic invariants which is a useful approach to chec . . .k if Hopf bifurcation exists. © 2018 Elsevier Inc Daha fazlası Daha az

Mitochondrial Energy Production

Hazal Yalçinkaya, B. | Genç, S. | Çatak, J. | Özilgen, M. | Yılmaz, B.

Book Part | 2018 | Comprehensive Energy Systems03.05.2020 , pp.95 - 125

Neuronal Energy Production

Hazal Yalçinkaya, B. | Genç, S. | Özilgen, M. | Yılmaz, B.

Book Part | 2018 | Comprehensive Energy Systems03.05.2020 , pp.638 - 672

The voluntary and involuntary communication within the body occurs through the nervous system. The building blocks of the nervous system are electrically excitable neurons and neuroglia. They require large amount of ATP in a very short period of time to be able to reestablish resting membrane conditions after transmitting signals as electric current; entropy generation accompanies this process. Generally, a single neuron cannot provide the sufficient energy to achieve this and will need the support of neuroglia. This chapter includes theories of signal transmission along the neurons parallel with the basic thermodynamic knowledge to . . . describe energy supply and consumption. © 2018 Elsevier Inc. All rights reserved Daha fazlası Daha az

Bioenergy Conversion

Çatak, J. | Semerciöz, A.S. | Yalçinkaya, B.H. | Yılmaz, B. | Özilgen, M.

Book Part | 2018 | Comprehensive Energy Systems04.05.2020 , pp.1131 - 1158

The major energy source in the world is solar energy. Only a small fraction of this energy is absorbed by plants to produce starch, for example, a glucose polymer, via photosynthesis. Glucose molecules are employed to produce adenosine triphosphate (ATP) in energy metabolism, which may be utilized to synthesize new plant cells. Herbivore animals survive on plants; carnivores prey on the herbivores. Both plant and animal cells store the chemical energy in their structures in the form of high-energy molecules. The raw material of fossil fuels is fossilized biological structures, for example, plant and animal cells. A similar conversio . . .n may be achieved by direct conversion, by skipping the fossil formation step, in biodiesel factories. The fossil fuel-rich areas of the world once housed rich ecosystems, before their inhabitants were fossilized. The age of the organisms and their resulting fossil fuels is typically millions of years. In biological structures, growth and reproduction and muscle work performance are achieved with ATP expenditure. In all of these processes substantial amounts of entropy are generated. Hormonal control of this energy uptake and utilization regulates functioning of anabolism and catabolism; the brain provides the balance between them. Imposing energy (calorie) restriction on the body may cause substantial changes in numerous body functions. © 2018 Elsevier Inc. All rights reserved Daha fazlası Daha az

Functional Biopolymers in Food Manufacturing

Ozilgen, S. | Bucak, S.

Book Part | 2018 | Biopolymers for Food Design , pp.157 - 189

Food hydrocolloids are high molecular weight long-chain biopolymers. They are made of high molecular weight polysaccharides and proteins. Hydrocolloids are widely used as functional food additives in many food products to keep or improve the sensory attributes of the foods and drinks, to improve the shelf life of the food products, to make the production processes easier and more efficient, and to produce functional food products. The key focus of this chapter is the hydrocolloids themselves, including the fundamental discussion of the research findings and their significance. The main areas of the interest are chemical and physicoc . . .hemical characterization of hydrocolloids, their rheological properties including viscosity, viscoelastic properties and gelation behavior, their interfacial properties, including stabilization of food colloids, their influence on sensory properties of food products, their film-forming properties with application to edible films and active packaging, their encapsulation properties, and their applications in the food industry as food additives and health promoters. Functional properties and the relation between the functional properties and the nanostructures of bacterial polysaccharides (e.g., xanthan, cellulose), plant/algal polysaccharides (e.g., starch, agar, alginate, pectin), and animal polysaccharides (e.g., chitosan), and their primary applications in the food industry are covered in this chapter. © 2018 Elsevier Inc. All rights reserved Daha fazlası Daha az

Detection of high GS risk group prostate tumors by diffusion tensor imaging and logistic regression modelling

Ertas, G.

Article | 2018 | Magnetic Resonance Imaging50 , pp.125 - 133

Purpose: To assess the value of joint evaluation of diffusion tensor imaging (DTI) measures by using logistic regression modelling to detect high GS risk group prostate tumors. Materials and methods: Fifty tumors imaged using DTI on a 3 T MRI device were analyzed. Regions of interests focusing on the center of tumor foci and noncancerous tissue on the maps of mean diffusivity (MD) and fractional anisotropy (FA) were used to extract the minimum, the maximum and the mean measures. Measure ratio was computed by dividing tumor measure by noncancerous tissue measure. Logistic regression models were fitted for all possible pair combinatio . . .ns of the measures using 5-fold cross validation. Results: Systematic differences are present for all MD measures and also for all FA measures in distinguishing the high risk tumors [GS ? 7(4 + 3)] from the low risk tumors [GS ? 7(3 + 4)] (P < 0.05). Smaller value for MD measures and larger value for FA measures indicate the high risk. The models enrolling the measures achieve good fits and good classification performances (R 2 adj = 0.55–0.60, AUC = 0.88–0.91), however the models using the measure ratios perform better (R 2 adj = 0.59–0.75, AUC = 0.88–0.95). The model that employs the ratios of minimum MD and maximum FA accomplishes the highest sensitivity, specificity and accuracy (Se = 77.8%, Sp = 96.9% and Acc = 90.0%). Conclusion: Joint evaluation of MD and FA diffusion tensor imaging measures is valuable to detect high GS risk group peripheral zone prostate tumors. However, use of the ratios of the measures improves the accuracy of the detections substantially. Logistic regression modelling provides a favorable solution for the joint evaluations easily adoptable in clinical practice. © 201 Daha fazlası Daha az

Methods for preparation of nanocomposites in environmental remediation

Ucankus, G. | Ercan, M. | Uzunoglu, D. | Çulha, Mustafa

Book Part | 2018 | New Polymer Nanocomposites for Environmental Remediation , pp.1 - 28

For environmental remediation, treatment of both air and water is an enormous challenge and a vast number of materials have been investigated for their ability to remove toxic chemicals and species from water and air. However, the search still continues to find the best material for the type of application. As an alternative to conventional materials, nanomaterials can provide new opportunities for coping with this challenge. In this chapter, detailed information about nanomaterials and polymers, which are used in environmental remediation, are discussed. Furthermore, the preparation of polymer nanocomposites is explained in two gen . . .eral categories: direct compounding and in situ synthesis. After examining nanomaterials, polymer, and preparation of their nanocomposites; recent studies, developing methodologies, and their environmental remediation applications are given. © 2018 Elsevier Inc. All rights reserved Daha fazlası Daha az

A Simplified Formula Discriminating Subtle Anterior Wall Myocardial Infarction from Normal Variant ST-Segment Elevation

Aslanger, E. | Yıldırımtürk, Ö. | Bozbeyoğlu, E. | Şimşek, B. | Karabay, C.Y. | Türer Cabbar, A. | Değertekin, M.

Article | 2018 | American Journal of Cardiology122 ( 8 ) , pp.1303 - 1309

Benign variant (BV) ST-segment elevation (STE) is present in anterior chest leads in most individuals and may cause diagnostic confusion in patients presenting with chest pain. Recently, 2 regression formulas were proposed for differentiation of BV-STE from anterior ST-elevation myocardial infarction (MI) on the electrocardiogram, computation of which is heavily device-dependent. We hypothesized that a simpler visual-assessment-based formula, namely (R-wave amplitude in lead V4 + QRS amplitude in V2) – (QT interval in millimeters + STE60 in V3), will be noninferior to these formulas. Consecutive cases of proven left anterior descend . . .ing occlusion were reviewed, and those with obvious ST elevation MI were excluded. First 200 consecutive patients with noncardiac chest pain and BV-STE were also enrolled as a control group. Relevant electrocardiographic parameters were measured. There were 138 anterior MI and 196 BV-STE cases. Our simple formula was superior to the 3- and noninferior to the 4-variable formulas. This new practical formula had an excellent area-under curve of 0.963 (95% confidence interval, 0.946 to 0.980, Daha fazlası Daha az

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