238 results on '"Duygu Tosun"'
Search Results
202. An integrated multimodality MR brain imaging study: Gray matter tissue loss mediates the association between cerebral hypoperfusion and alzheimer’s disease
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Norbert Schuff, Duygu Tosun, and Michael Weiner
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medicine.medical_specialty ,Modalities ,genetic structures ,medicine.diagnostic_test ,Magnetic resonance imaging ,Image processing ,Neuropathology ,Neurophysiology ,medicine.disease ,Brain mapping ,Neuroimaging ,medicine ,Radiology ,Alzheimer's disease ,Psychology ,Neuroscience - Abstract
Multimodality MR image processing and analysis aims to determine to what extent information from various imaging modalities is redundant or complementary and how changes in various regions of the brain, detected by various modalities, interact with each other to produce cognitive and functional changes. Here, we presented a multimodality image processing framework to integrate unique and complementary observations on anatomical and physiological brain changes measured by structural and perfusion MR imaging modalities. A unique aspect to this study is that we performed a test on mediation hypothesis that requires a model based on measurements from both MR imaging modalities. Our findings from these integrated multi-modality analysis were congruent with previously published results on neuropathology of AD patients and supplied a comprehensive explanation on the integration between structural atrophy and physiological deterioration due to AD.
- Published
- 2009
203. P1‐083: Interrelation between gray and white matter alterations in Alzheimer's disease and frontotemporal dementia
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Yu Zhang, Norbert Schuff, Christopher Ching, Duygu Tosun, Marzieh Nezamzadeh, Wang Zhan, Howard J. Rosen, Joel H. Kramer, Maria Luisa Gorno‐Tempini, Bruce L. Miller, and Michael W. Weiner
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Psychiatry and Mental health ,Cellular and Molecular Neuroscience ,Developmental Neuroscience ,Epidemiology ,Health Policy ,Neurology (clinical) ,Geriatrics and Gerontology - Published
- 2009
204. O1‐01‐08: Associations between baseline concentration of Alzheimer's disease biochemical markers and MRI regional rates of brain tissue loss in ADNI data
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John Q. Trojanoswki, Duygu Tosun, Michael W. Weiner, Norbert Schuff, Diana Truran-Sacrey, Sky Raptentsetsang, and Lee Shaw
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Pathology ,medicine.medical_specialty ,Epidemiology ,business.industry ,Health Policy ,Brain tissue ,Disease ,Psychiatry and Mental health ,Cellular and Molecular Neuroscience ,Developmental Neuroscience ,medicine ,Neurology (clinical) ,Baseline concentration ,Geriatrics and Gerontology ,business ,Biochemical markers - Published
- 2009
205. IC‐P‐086: Rates of regional brain atrophy and gain in power for assessment of cognitive decline in clinical trials
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Norbert Schuff, Sky Raptentsetsang, Duygu Tosun, Diana Truran, and Michael W. Weiner
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Psychiatry and Mental health ,Cellular and Molecular Neuroscience ,Developmental Neuroscience ,Epidemiology ,Health Policy ,Neurology (clinical) ,Geriatrics and Gerontology - Published
- 2009
206. P1‐109: Rates of regional brain atrophy and gain in power for assessment of cognitive decline in clinical trials
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Diana Truran, Norbert Schuff, Duygu Tosun, Sky Raptentsetsang, and Michael W. Weiner
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medicine.medical_specialty ,Epidemiology ,business.industry ,Health Policy ,medicine.disease ,Clinical trial ,Psychiatry and Mental health ,Cellular and Molecular Neuroscience ,Atrophy ,Physical medicine and rehabilitation ,Developmental Neuroscience ,Medicine ,Neurology (clinical) ,Geriatrics and Gerontology ,Cognitive decline ,business - Published
- 2009
207. IC‐P‐038: Interrelation between gray and white matter alterations in Alzheimer's Disease and Frontotemporal Dementia
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Joel H. Kramer, Bruce L. Miller, Yu Zhang, Christopher Ching, Michael Weiner, Wang Zhan, Maria Luisa Gorno-Tempini, Norbert Schuff, Duygu Tosun, Marzieh Nezamzadeh, and Howard J. Rosen
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Pathology ,medicine.medical_specialty ,White matter alterations ,Epidemiology ,business.industry ,Health Policy ,Disease ,medicine.disease ,Psychiatry and Mental health ,Cellular and Molecular Neuroscience ,Developmental Neuroscience ,medicine ,Neurology (clinical) ,Geriatrics and Gerontology ,business ,Gray (horse) ,Frontotemporal dementia - Published
- 2009
208. Production and foreign trade of sheep-goat in some mediterranean countries which are members to the EU and Turkey
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Nevin Demirbaş, Duygu Tosun, Tugay Taşkın, and Ege Üniversitesi
- Subjects
Ziraat ,Sütçülük ve Hayvan Bilimleri - Abstract
Türkiye koyun ve keçi varlığında Dünya’nın ve Akdeniz Havzası’nın önde gelen ülkeleri arasındadır. AB’de bu üretim dallarını içine alan destekleme politikaları, her iki üretim faaliyetinin sürdürülebilirliğini olumlu yönde etkilemektedir. Bununla birlikte, AB’de koyun-keçi ve ürünlerinde kendine yeterlilik düzeyleri dikkate alındığında, Türkiye’nin bazı ticari fırsatlara sahip olduğu da ortadadır. Bu makalenin amacı, Türkiye’nin koyun-keçi ürünleri üretim ve dış ticaretini Akdeniz’e kıyısı olan ve önemli koyun-keçi varlığına sahip AB ülkeleriyle birlikte değerlendirmektir. Çalışmada ele alınan ülkeler son 30 yılın ortalamasına göre, koyun ve keçi varlığında önemli AB üyesi Akdeniz ülkeleri arasından seçilmiştir. Bu ülkeler, Fransa, Yunanistan, İtalya ve İspanya’dır. AB’de koyun-keçi ürünlerinde kendine yeterliliğe ulaşılamaması Türkiye açısından potansiyel bir pazar fırsatı yaratmaktadır. Özellikle AB’de koyun-keçi sütünden yapılan peynirlere olan talep giderek artmaktadır. Önemli üretici ülkelerde bile koyun ve keçi derisi ithalat değeri yüksektir. Türkiye kaliteli deri üretimiyle ithalata dayalı üretimini azaltabileceği gibi, mevcut hayvan varlığıyla önemli bir ihracatçı olma potansiyeline de sahiptir. Sektörden elde edilen ürünler artan oranlarda işlemeye ve pazar ekonomisine yönlendirilmelidir. Bunun için, hayvan sağlığını, kaliteli üretimi ve sürdürülebilirlik koşullarını sağlayan istikrarlı üretim ve pazarlama politikaları izlenmelidir., Turkey is one of the major countries in sheep-goat population in the world and Mediterranean Basin. Supporting policies, included these production braches in the EU, have affected positive for sustainable sheep-goat production. However, when considered self-sufficient levels in sheep-goat production in the EU countries, it is clear that Turkey has some marketing opportunities. The aim of this study is to evaluate the production and export of Turkey in sheep-goat products with some Mediterranean countries, which are member to the EU and have important sheep-goat population. According to the last 30 years average, these countries are France, Greece, Italy and Spain. Insufficient production level for sheep-goat products in the EU is a potential market opportunity for Turkey. Especially the demand of cheeses, which made of sheep-goat milk, has increased. In addition, in leader producer countries, the export value for sheep-goat hide is high. However, both the production based on import can be decreased by producing quality hide in Turkey and export potential can be increased. Products obtained from sectors, it must be led to processing and the market economic. For this, the stable production and marketing policies must be realized, which provides animal healthy, quality processing products and sustainability.
- Published
- 2009
209. A geometry-driven optical flow warping for spatial normalization of cortical surfaces
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Jerry L. Prince and Duygu Tosun
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Structural alignment ,Coordinate system ,Optical flow ,Normalization (image processing) ,Normal Distribution ,Geometry ,Article ,Pattern Recognition, Automated ,Imaging, Three-Dimensional ,Fuzzy Logic ,Image Interpretation, Computer-Assisted ,Humans ,Computer vision ,Electrical and Electronic Engineering ,Image warping ,Image resolution ,Mathematics ,Cerebral Cortex ,Radiological and Ultrasound Technology ,Geometrical optics ,business.industry ,Image Enhancement ,Magnetic Resonance Imaging ,Computer Science Applications ,Spatial normalization ,Artificial intelligence ,business ,Software ,Algorithms - Abstract
Spatial normalization is frequently used to map data to a standard coordinate system by removing inter-subject morphological differences, thereby allowing for group analysis to be carried out. The work presented in this paper is motivated by the need for an automated cortical surface normalization technique that will automatically identify homologous cortical landmarks and map them to the same coordinates on a standard manifold. The geometry of a cortical surface is analyzed using two shape measures that distinguish the sulcal and gyral regions in a multi-scale framework. A multichannel optical flow warping procedure aligns these shape measures between a reference brain and a subject brain, creating the desired normalization. The partial differential equation that carries out the warping is implemented in a Euclidean framework in order to facilitate a multi-resolution strategy, thereby permitting large deformations between the two surfaces. The technique is demonstrated by aligning 33 normal cortical surfaces and showing both improved structural alignment in manually labeled sulci and improved functional alignment in positron emission tomography data mapped to the surfaces. A quantitative comparison between our proposed surface-based spatial normalization method and a leading volumetric spatial normalization method is included to show that the surface-based spatial normalization performs better in matching homologous cortical anatomies.
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- 2008
210. Food Safety Practices In Milk Collection Centers In Turkey: A Case Study
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Duygu Tosun, Evren Gölge, Figen Çukur, and Nevin Demirbaş
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Descriptive statistics ,Turkish ,business.industry ,media_common.quotation_subject ,Food safety ,language.human_language ,Test (assessment) ,Likert scale ,Continuous variable ,Geography ,Statistics ,language ,Business, Management and Accounting (miscellaneous) ,Operations management ,Quality (business) ,business ,Food quality ,Food Science ,media_common - Abstract
PurposeThe aim of this study was to reveal the role and importance of the milk collection centers in İzmir in assuring food safety in the Turkish dairy sector.Design/methodology/approachA five‐point Likert scale was applied to collect data on the food safety practices and the problems confronted in MCCs. The difference between the groups in the managers' and MCCs' specifications and the food safety applications in the MCCs were determined by one‐way ANOVA for continuous variables. For the continuous variables, a normal distribution test was applied by Jarque‐Bera test. For variables displaying normal distribution, analysis of variance (one‐way ANOVA) was performed. For the variables not displaying normal distribution, Kruskall‐Wallis test. In the evaluation of other data descriptive statistics were applied.FindingsBecause the milk in the MCCs is generally obtained from small‐scale family farms, it is not of the desired quality from a food safety and food quality perspective. The quality control analysis of raw milk cannot be carried out because of the lack of qualified specialists and equipment inadequacies. The most general test applied on milk delivery is based on the monitoring of the sensory properties of the milk.Research limitations/implicationsAll MCCs were covered in the sample size of the research and the questionnaires were applied to all 43 MCC managers in İzmir.Practical implicationsAn effective organizational and educational structure must be established to monitor food safety and related practices in MCCs.Originality/valueThe paper adds to the body of knowledge on procecessors and their attitudes to food safety and suggests implementation of various practices which could improve results.
- Published
- 2008
211. Cortical surface alignment using geometry driven multispectral optical flow
- Author
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Duygu, Tosun and Jerry L, Prince
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Imaging, Three-Dimensional ,Artificial Intelligence ,Subtraction Technique ,Image Interpretation, Computer-Assisted ,Brain ,Humans ,Reproducibility of Results ,Image Enhancement ,Magnetic Resonance Imaging ,Sensitivity and Specificity ,Algorithms ,Pattern Recognition, Automated - Abstract
Spatial normalization is frequently used to map data to a standard coordinate system by removing inter-subject morphological differences, thereby allowing for group analysis to be carried out. In this paper, we analyze the geometry of the cortical surface using two shape measures that are the key to distinguish sulcal and gyral regions from each other. Then a multispectral optical flow (OF) warping procedure that aims to align the shape measure maps of an atlas and a subject brain's normalized maps is described. The variational problem to estimate the OF field is solved using a Euclidean framework. After warping one brain given the OF result, we obtain a better structural and functional alignment across multiple brains.
- Published
- 2007
212. 3-D analysis of cortical morphometry in differential diagnosis of Parkinson's plus syndromes: mapping frontal lobe cortical atrophy in progressive supranuclear palsy patients
- Author
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Marc Vérin, Simon Duchesne, Yan Rolland, Arthur W. Toga, Duygu Tosun, Christian Barillot, Centre de recherche Université Laval Robert Giffard (CRULRG), Université Laval [Québec] (ULaval), Laboratoire Traitement du Signal et de l'Image (LTSI), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National de la Santé et de la Recherche Médicale (INSERM), Laboratory of Neuro Imaging [Los Angeles] (LONI), University of California [Los Angeles] (UCLA), University of California-University of California, Service de neurologie [Rennes], Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Vision, Action et Gestion d'informations en Santé (VisAGeS), Institut National de la Santé et de la Recherche Médicale (INSERM)-Inria Rennes – Bretagne Atlantique, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-SIGNAUX ET IMAGES NUMÉRIQUES, ROBOTIQUE (IRISA-D5), Institut de Recherche en Informatique et Systèmes Aléatoires (IRISA), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-Institut National de Recherche en Informatique et en Automatique (Inria)-Télécom Bretagne-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-Institut National de Recherche en Informatique et en Automatique (Inria)-Télécom Bretagne-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche en Informatique et Systèmes Aléatoires (IRISA), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-Télécom Bretagne-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National de la Santé et de la Recherche Médicale (INSERM), University of California (UC)-University of California (UC), Université de Rennes (UR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-Institut National de Recherche en Informatique et en Automatique (Inria)-Télécom Bretagne-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-Institut National de Recherche en Informatique et en Automatique (Inria)-Télécom Bretagne-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche en Informatique et Systèmes Aléatoires (IRISA), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-Télécom Bretagne-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Grosset, Aline
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Male ,Pathology ,Movement disorders ,MESH: Frontal Lobe ,030218 nuclear medicine & medical imaging ,Pattern Recognition, Automated ,MESH: Magnetic Resonance Imaging ,0302 clinical medicine ,MESH: Pattern Recognition, Automated ,MESH: Aged ,MESH: Middle Aged ,medicine.diagnostic_test ,Middle Aged ,Magnetic Resonance Imaging ,Frontal Lobe ,MESH: Reproducibility of Results ,medicine.anatomical_structure ,Frontal lobe ,Cerebral cortex ,Female ,[SDV.IB]Life Sciences [q-bio]/Bioengineering ,Supranuclear Palsy, Progressive ,medicine.symptom ,MESH: Image Enhancement ,Algorithms ,medicine.medical_specialty ,MESH: Algorithms ,MESH: Imaging, Three-Dimensional ,MESH: Atrophy ,Sensitivity and Specificity ,Article ,Progressive supranuclear palsy ,Diagnosis, Differential ,03 medical and health sciences ,Atrophy ,Imaging, Three-Dimensional ,Parkinsonian Disorders ,Artificial Intelligence ,MESH: Diagnosis, Differential ,Image Interpretation, Computer-Assisted ,medicine ,Humans ,MESH: Artificial Intelligence ,Cortical atrophy ,Aged ,[SDV.IB] Life Sciences [q-bio]/Bioengineering ,MESH: Humans ,business.industry ,MESH: Parkinsonian Disorders ,Reproducibility of Results ,Magnetic resonance imaging ,medicine.disease ,Image Enhancement ,MESH: Male ,MESH: Sensitivity and Specificity ,nervous system diseases ,MESH: Supranuclear Palsy, Progressive ,Differential diagnosis ,business ,MESH: Female ,MESH: Image Interpretation, Computer-Assisted ,030217 neurology & neurosurgery - Abstract
International audience; With the ability to study brain anatomy in vivo using magnetic resonance imaging, studies on regional brain atrophy suggest possible improvements for differential diagnosis of movement disorders with parkinsonian symptoms. In this study, we investigate effects of different parkinsonian syndromes on the cortical gray matter thickness and the geometric shape of the cerebral cortex. The study consists of a total of 24 patients with a diagnosis of probable progressive supranuclear palsy (PSP), multiple systems atrophy (MSA) or idiopathic Parkinson's disease (IPD). We examine dense estimates of cortical gray matter thickness, sulcal depth, and measures of the curvature in a surface-based cortical morphometry analysis framework. Group difference results indicate higher cortical atrophy rate in the frontal lobe in PSP patients when compared to either MSA or IPD. These findings are indicative of the potential use of routine MRI and cortical morphometry in performing differential diagnosis in PSP, MSA and IPD.
- Published
- 2007
213. Production and marketing of traditional foods from the standpoint of the food safety with special reference to the EU
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Nevin Demirbaş, Dilşen Oktay, Duygu Tosun, and Ege Üniversitesi
- Subjects
Ziraat ,Mühendislik - Abstract
AB'de 1990'lı yıllarda tüketicileri ve gıda sektöründeki tüm kesimleri tedirgin eden gıda kaynaklı sorunlar, karar alıcıları ve yetkilileri gıda güvenliği ve kalitesi konusuna odaklanmaya itmiştir. Bu bağlamda, Birlik içinde üretilen geleneksel gıdalarla ilgili önemli mevzuat düzenlemeleri de yapılmıştır. Türkiye'de de son yıllarda gıda güvenliğine ilişkin mevzuat hazırlıkları ve uygulanmalarına dönük çalışmalar, uluslar arası ticaretin ve özellikle AB ile olan ilişkilerin gereği olarak hızlanmıştır, önemli bir gıda Üretim potansiyeline sahip olan Türkiye, geleneksel gıda çeşitliliği ve üretimi açısından da zengin bir dokuya sahiptir. Bu tür gıdaların üretim ve pazarlamasının ekonomik boyutları da giderek artmaktadır. Günümüzde pazar bağlantılı gıda üretiminin ticari kuralları ise, gıda güvenliği ve kalitesinden ayrı düşünülememektedir. Bu çalışmanın amacı, AB sürecinde Türkiye'de geleneksel gıdaların üretim ve pazarlama durumunun gıda güvenliği çalışmaları açısından değerlendirilmesidir. Çalışma, Türkçe ve yabancı dillerde yayınlanmış literatür araştırmasına dayalı olarak hazırlanmıştır., During 1990's, problems originated by food which concerned every actor in the sector and especially consumers, forced authorities and experts to focus on food quality and safety issues. As a consequence, there have been some crucial legal regulations related with traditional foods produced in the EU. In Turkey as well, some legal arrangements regarding food safety have accelerated recently, due to changes in international trade and improvements in relationships with the EU. Turkey, which has a great potential of food production, also has an outstanding variety and production of traditional foods. In case of considering traditional foods in macro level, the scale of production and marketing of such goods enlarges. In today's conditions, rules of food products' trade related with the market, necessitate food quality and safety. The aim of this study is to define the place of traditional foods in food safety acts in Turkey and to evaluate some strategies for production and marketing of traditional foods from the view point of conforming to the EU. This article is a review of Turkish and Foreign literature.
- Published
- 2006
214. Association between tau deposition and antecedent amyloid-β accumulation rates in normal and early symptomatic individuals.
- Author
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Duygu Tosun, Landau, Susan, Aisen, Paul S., Petersen, Ronald C., Mintun, Mark, Jagust, William, Weiner, Michael W., Tosun, Duygu, and Alzheimer’s Disease Neuroimaging Initiative
- Subjects
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COGNITIVE development , *COGNITIVE ability , *DEMENTIA , *ALZHEIMER'S disease risk factors , *AMYLOID , *AGING , *ALZHEIMER'S disease , *AMINES , *APOLIPOPROTEINS , *COGNITION , *HUMAN reproduction , *MAGNETIC resonance imaging , *NEUROPSYCHOLOGICAL tests , *NERVE tissue proteins , *NEUROLOGIC examination , *PEPTIDES , *PYRIDINE , *POSITRON emission tomography , *EDUCATIONAL attainment , *ETHYLENE glycols , *CROSS-sectional method , *CASE-control method ,BRAIN metabolism - Abstract
See Vandenberghe and Schaeverbeke (doi:10.1093/awx065) for a scientific commentary on this article. A long-term goal of our field is to determine the sequence of pathological events, which ultimately lead to cognitive decline and dementia. In this study, we first assessed the patterns of brain tau tangle accumulation (measured with the positron emission tomography tracer 18F-AV-1451) associated with well-established Alzheimer's disease factors in a cohort including cognitively healthy elderly individuals and individuals at early symptomatic stages of Alzheimer's disease. We then explored highly associated patterns of greater 18F-AV-1451 binding and increased annualized change in cortical amyloid-β plaques measured as florbetapir positron emission tomography binding antecedent to 18F-AV-1451 positron emission tomography scans, and to what extent these multimodal pattern associations explained the variance in cognitive performance and clinical outcome measures, independently and jointly. We found that: (i) 18F-AV-1451 positron emission tomography retention was differentially associated with age, and cross-sectional florbetapir positron emission tomography retention, but not with years of education, gender, or APOE genotype; (ii) increased annualized change in florbetapir retention, antecedent to 18F-AV-1451 positron emission tomography scans, in the parieto-temporal and precuneus brain regions was associated with greater 18F-AV-1451 PET retention most prominently in the inferior temporal and inferior parietal regions in the full cohort, with florbetapir positive/negative-associated variability; and (iii) this 18F-AV-1451 positron emission tomography retention pattern significantly explained the variance in cognitive performance and clinical outcome measures, independent of the associated antecedent increased annualized change in florbetapir positron emission tomography retention. These findings are in agreement with the pathology literature, which suggests that tau tangles but not amyloid-β plaques correlate with cognition and clinical symptoms. Furthermore, non-local associations linking increased amyloid-β accumulation rates with increased tau deposition are of great interest and support the idea that the amyloid-β pathology might have remote effects in disease pathology spread potentially via the brain's intrinsic connectivity networks. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
215. Cortical Surface Alignment Using Geometry Driven Multispectral Optical Flow
- Author
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Jerry L. Prince and Duygu Tosun
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Atlas (topology) ,business.industry ,Multispectral image ,Coordinate system ,Optical flow ,Geometry ,Measure (mathematics) ,Euclidean geometry ,Spatial normalization ,Computer vision ,Artificial intelligence ,Image warping ,business ,Mathematics - Abstract
Spatial normalization is frequently used to map data to a standard coordinate system by removing inter-subject morphological differences, thereby allowing for group analysis to be carried out. In this paper, we analyze the geometry of the cortical surface using two shape measures that are the key to distinguish sulcal and gyral regions from each other. Then a multispectral optical flow (OF) warping procedure that aims to align the shape measure maps of an atlas and a subject brain’s normalized maps is described. The variational problem to estimate the OF field is solved using a Euclidean framework. After warping one brain given the OF result, we obtain a better structural and functional alignment across multiple brains.
- Published
- 2005
216. Mapping techniques for aligning sulci across multiple brains☆
- Author
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Maryam E. Rettmann, Jerry L. Prince, and Duygu Tosun
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North pole ,Computer science ,Geometry ,Health Informatics ,Image processing ,Brain mapping ,Article ,Cortex (anatomy) ,medicine ,Image Processing, Computer-Assisted ,Humans ,Radiology, Nuclear Medicine and imaging ,Computer vision ,Mapping techniques ,Cortical surface ,Mathematics ,Cerebral Cortex ,Brain Mapping ,Radiological and Ultrasound Technology ,business.industry ,Pattern recognition ,Computer Graphics and Computer-Aided Design ,Magnetic Resonance Imaging ,Visualization ,stomatognathic diseases ,medicine.anatomical_structure ,nervous system ,Computer Vision and Pattern Recognition ,Artificial intelligence ,business ,Algorithms - Abstract
Visualization and mapping of function on the cortical surface is difficult because of its sulcal and gyral convolutions. Methods to unfold and flatten the cortical surface for visualization and measurement have been described in the literature. This makes visualization and measurement possible, but comparison across multiple subjects is still difficult because of the lack of a standard mapping technique. In this paper, we describe two methods that map each hemisphere of the cortex to a portion of a sphere in a standard way. To quantify how accurately the geometric features of the cortex -- i.e., sulci and gyri -- are mapped into the same location, sulcal alignment across multiple brains is analyzed, and probabilistic maps for different sulcal regions are generated to be used in automatic labelling of segmented sulcal regions.
- Published
- 2004
217. Cortical surface segmentation and mapping
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Dzung L. Pham, Xiaodong Tao, Chenyang Xu, Jerry L. Prince, Susan M. Resnick, Duygu Tosun, Xiao Han, and Maryam E. Rettmann
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Aging ,Cognitive Neuroscience ,Image processing ,Brain mapping ,Flattening ,Article ,Robustness (computer science) ,medicine ,Image Processing, Computer-Assisted ,Humans ,Computer vision ,Segmentation ,Cortical surface ,Nerve Tissue ,Cerebral Cortex ,Brain Mapping ,Models, Statistical ,medicine.diagnostic_test ,business.industry ,Reproducibility of Results ,Magnetic resonance imaging ,Magnetic Resonance Imaging ,medicine.anatomical_structure ,Neurology ,Cerebral cortex ,Artificial intelligence ,Psychology ,business ,Algorithms - Abstract
Segmentation and mapping of the human cerebral cortex from magnetic resonance (MR) images plays an important role in neuro-science and medicine. This paper describes a comprehensive approach for cortical reconstruction, flattening, and sulcal segmentation. Robustness to imaging artifacts and anatomical consistency are key achievements in an overall approach that is nearly fully automatic and computationally fast. Results demonstrating the application of this approach to a study of cortical thickness changes in aging are presented.
- Published
- 2004
218. Program for Assisted Labeling of Sulcal Regions (PALS): description and reliability
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Maryam E. Rettmann, Susan M. Resnick, Jerry L. Prince, Xiaodong Tao, and Duygu Tosun
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Surface (mathematics) ,Models, Anatomic ,Computer science ,Cognitive Neuroscience ,Models, Neurological ,Stability (probability) ,Cortex (anatomy) ,medicine ,Image Processing, Computer-Assisted ,Humans ,Computer vision ,Cortical surface ,Reliability (statistics) ,Cerebral Cortex ,Brain Mapping ,business.industry ,Reproducibility of Results ,Human brain ,Sulcus ,Cortex (botany) ,medicine.anatomical_structure ,Neurology ,Artificial intelligence ,business ,Cortical sulcus ,Algorithms - Abstract
With the improvements in techniques for generating surface models from magnetic resonance (MR) images, it has recently become feasible to study the morphological characteristics of the human brain cortex in vivo. Studies of the entire surface are important for measuring global features, but analysis of specific cortical regions of interest provides a more detailed understanding of structure. We have previously developed a method for automatically segmenting regions of interest from the cortical surface using a watershed transform. Each segmented region corresponds to a cortical sulcus and is thus termed a “sulcal region.” In this work, we describe two important augmentations of this methodology. First, we describe a user interface that allows for the efficient labeling of the segmented sulcal regions called the Program for Assisted Labeling of Sulcal Regions (PALS). An additional augmentation allows for even finer divisions on the cortex with a methodology that employs the fast marching technique to track a curve on the cortical surface that is then used to separate segmented regions. After regions of interest have been identified, we compute both the cortical surface area and gray matter volume. Reliability experiments are performed to assess both the long-term stability and short-term repeatability of the proposed techniques. These experiments indicate the proposed methodology gives both highly stable and repeatable results.
- Published
- 2004
219. Cortical Reconstruction Using Implicit Surface Evolution: A Landmark Validation Study
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Michael A. Kraut, Daniel Q. Naiman, Jerry L. Prince, Susan M. Resnick, Maryam E. Rettmann, and Duygu Tosun
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Surface (mathematics) ,Validation study ,Landmark ,medicine.diagnostic_test ,Basis (linear algebra) ,Computer science ,business.industry ,Magnetic resonance imaging ,computer.software_genre ,Cortex (botany) ,White matter ,Brain region ,medicine.anatomical_structure ,Cerebral cortex ,Voxel ,Cortex (anatomy) ,medicine ,Computer vision ,Cortical surface ,Artificial intelligence ,business ,computer - Abstract
A validation study was conducted to assess the accuracy of an algorithm developed for automatic reconstruction of the cerebral cortex from T1-weighted magnetic resonance (MR) brain images. Manually selected landmarks on different sulcal regions throughout the cortex were used to analyze the accuracy of three reconstructed nested surfaces – the inner, central, and pial surfaces. We conclude that the algorithm can find these surfaces with subvoxel accuracy, typically with an accuracy of one third of a voxel, although this varies by brain region and cortical geometry. Parameters were adjusted on the basis of this analysis in order to improve the algorithm’s overall performance.
- Published
- 2004
220. Cortical surface reconstruction using a topology preserving geometric deformable model
- Author
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Duygu Tosun, Chenyang Xu, Xiao Han, and Jerry L. Prince
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Surface (mathematics) ,business.industry ,Computer science ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Biomedical image ,Iterative reconstruction ,Topology ,Data set ,Level set ,Computer vision ,Artificial intelligence ,Cortical surface ,business ,Topology (chemistry) ,ComputingMethodologies_COMPUTERGRAPHICS ,Parametric statistics - Abstract
Accurate reconstruction of the cortical surface of the brain from magnetic resonance images is an important objective in biomedical image analysis. Parametric deformable surface models are usually used because they incorporate prior information, yield subvoxel accuracy, and automatically preserve topology. These algorithms are very computationally costly, however, particularly if self-intersection prevention is imposed. Geometric deformable surface models, implemented using level set methods, are computationally fast and are automatically free from self-intersections, but are unable to guarantee the correct topology. This paper describes both a new geometric deformable surface model which preserves topology and an overall strategy for reconstructing the inner, central, and outer surfaces of the brain cortex. The resulting algorithm is fast and numerically stable, and yields accurate brain surface reconstructions that are guaranteed to be topologically correct and free from self intersections. We ran the algorithm on 21 data sets and show detailed results for a typical data set. We also show a preliminary validation using landmarks manually placed as a truth model on six of the data sets.
- Published
- 2002
221. THE PROBLEMS OF OLIVE FARMERS IN TERMS OF THE DEVELOPMENT OF OLIVE OIL INDUSTRY IN TURKEY: A CASE STUDY OF IZMIR PROVINCE
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Nevin Demirbaş, Doğa Sağiroğlu, Yeliz Merve Apaydin, and Duygu Tosun
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General Materials Science - Abstract
Turkiye zeytin ve zeytinyagi uretimi acisindan son derece uygun ekolojik kosullara sahip olmakla birlikte, sektorde yasanan sorunlar zeytinyagi sanayiinin gelisimini dogrudan etkilemektedir. Zeytinyagi sanayinin hammadde ihtiyaci zeytin isletmelerinden karsilandigi icin uretimdeki sorunlar, dolayisiyla ureticilerin sorunlari, sanayiinin gelisimi acisindan buyuk oneme sahiptir. Bu calismanin amaci, zeytin ureticilerinin sorunlarinin tespit edilmesi ve bu sorunlarin zeytinyagi sanayiinin gelisimi uzerindeki etkilerinin degerlendirilmesidir. Bu dogrultuda Ege Bolgesi’nde onemli uretim bolgelerinden biri olan Izmir ilindeki, 64 zeytin ureticisiyle yuz yuze gorusulerek anket calismasi yapilmistir. Arastirma sonuclarina gore zeytin ureticilerinin karsilastigi sorunlarin basinda; girdi fiyatlarinin yuksekligi, talep yetersizligi, desteklemelerin yetersizligi, kulturel teknikler konusunda egitimlerin yeterli olmamasi ve orgutlenme sorunlari gelmektedir. Bu sonuclara gore, ureticilerin ozellikle bakim, hasat, depolama ve orgutlenme konularinda desteklenmeleri ve bilinclendirilmeleri son derece onemlidir. Uretici orgutlerinin de etkin oldugu bir pazarlama organizasyonu ile ureticilerin gelirleri ve uretimde verimlilik artirilabilecektir. Boylece zeytinyagi sanayinin ihtiyac duydugu kalite ve miktarda hammadde de saglanabilecektir. Dolayisiyla zeytinyagi sanayii yarattigi yuksek katma deger ile ulke ekonomisine katkida bulunabilecektir.
- Published
- 2014
222. Chronic Depressive Symptomatology in Mild Cognitive Impairment Is Associated with Frontal Atrophy Rate which Hastens Conversion to Alzheimer Dementia.
- Author
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Sacuiu, Simona, Inset, Philip S., Mueller, Susanne, Duygu Tosun, Mattsson, Niklas, Jack Jr., Clifford R., DeCarli, Charles, Petersen, Ronald, Aisen, Paul S., Weiner, Michael W., Mackin, R. Scott, Insel, Philip S, Tosun, Duygu, Jack, Clifford R Jr, and Alzheimer's Disease Neuroimaging Initiative
- Abstract
Objective: Investigate the association of chronic depressive symptomatology (chrDS) with cortical atrophy rates and conversion to Alzheimer dementia (AD) over 3 years in mild cognitive impairment (MCI).Methods: In a multicenter, clinic-based study, MCI elderly participants were selected from the Alzheimer's Disease Neuroimaging Initiative repository, based on availability of both serial structural magnetic resonance imaging and chrDS endorsed on three depression-related items from the Neuropsychiatric Inventory Questionnaire (chrDS N = 32 or no depressive symptoms N = 62) throughout follow-up. Clinical and laboratory investigations were performed every 6 months during the first 2 years and yearly thereafter (median follow-up: 3 years; interquartile range: 1.5-4.0 years). Cortical atrophy rates in 16 predefined frontotemporoparietal regions affected in major depression and AD and the rate of incident AD at follow-up.Results: ChrDS in a single domain amnestic MCI sample were associated with accelerated cortical atrophy in the frontal lobe and anterior cingulate but not with atrophy rates in temporomedial or other AD-affected regions. During follow-up, 38 participants (42.7%) developed AD. Participants with chrDS had 60% shorter conversion time to AD than those without depressive symptoms. This association remained significant in survival models adjusted for temporomedial atrophy rates and showed the same trend in models adjusted for frontal cortical atrophy rate, which all increased the risk of AD.Conclusion: Our results suggest that chrDS associated with progressive atrophy of frontal regions may represent an additional risk factor for conversion to dementia in MCI as opposite to representing typical prodromal AD symptomatology. [ABSTRACT FROM AUTHOR]- Published
- 2016
- Full Text
- View/download PDF
223. Cerebral Amyloid and Hypertension are Independently Associated with White Matter Lesions in Elderly.
- Author
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Scott, Julia A., Braskie, Meredith N., Duygu Tosun, Thompson, Paul M., Weiner, Michael, DeCarli, Charles, and Carmichael, Owen T.
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AMYLOID ,HYPERTENSION ,LEUKOENCEPHALOPATHIES ,DISEASES in older people ,ALZHEIMER'S disease diagnosis - Abstract
In cognitively normal (CN) elderly individuals, white matter hyperintensities (WMH) are commonly viewed as a marker of cerebral small vessel disease (SVD). SVD is due to exposure to systemic vascular injury processes associated with highly prevalent vascular risk factors (VRFs) such as hypertension, high cholesterol, and diabetes. However, cerebral amyloid accumulation is also prevalent in this population and is associated with WMH accrual. Therefore, we examined the independent associations of amyloid burden and VRFs with WMH burden in CN elderly individuals with low to moderate vascular risk. Participants (n = 150) in the Alzheimer's Disease Neuroimaging Initiative (ADNI) received fluid attenuated inversion recovery (FLAIR) MRI at study entry. Total WMH volume was calculated from FLAIR images co-registered with structural MRI. Amyloid burden was determined by cerebrospinal fluid Aβ
1-42 levels. Clinical histories of VRFs, as well as current measurements of vascular status, were recorded during a baseline clinical evaluation. We tested ridge regression models for independent associations and interactions of elevated blood pressure (BP) and amyloid to total WMH volume. We found that greater amyloid burden and a clinical history of hypertension were independently associated with greater WMH volume. In addition, elevated BP modified the association between amyloid and WMH, such that those with either current or past evidence of elevated BP had greater WMH volumes at a given burden of amyloid. These findings are consistent with the hypothesis that cerebral amyloid accumulation and VRFs are independently associated with clinically latent white matter damage represented by WMHs. The potential contribution of amyloid to WMHs should be further explored, even among elderly individuals without cognitive impairment and with limited VRF exposure. [ABSTRACT FROM AUTHOR]- Published
- 2015
- Full Text
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224. The Effect of Subsyndromal Symptoms of Depression and White Matter Lesions on Disability for Individuals With Mild Cognitive Impairment
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R. Scott Mackin, Philip Insel, Duygu Tosun, Susanne G. Mueller, Norbert Schuff, Diana Truran-Sacrey, Sky T. Raptentsetsang, Jun-Young Lee, Clifford R. Jack, Paul S. Aisen, Ronald C. Petersen, and Michael W. Weiner
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Psychiatry and Mental health ,Geriatrics and Gerontology - Published
- 2012
225. Childhood Absence Seizures are Associated With Morphometric Alterations in Posterior Cortical Regions
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Arthur W. Toga, Prabha Siddarth, Rochelle Caplan, Duygu Tosun, and Bruce P. Hermann
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Pathology ,medicine.medical_specialty ,Neurology ,business.industry ,Cognitive Neuroscience ,medicine ,Childhood absence seizures ,business - Published
- 2009
226. Cortical Surface Alignment Using Geometry Driven Multispectral Optical Flow.
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Sonka, Milan, Christensen, Gary E., Duygu Tosun, and Prince, Jerry L.
- Abstract
Spatial normalization is frequently used to map data to a standard coordinate system by removing inter-subject morphological differences, thereby allowing for group analysis to be carried out. In this paper, we analyze the geometry of the cortical surface using two shape measures that are the key to distinguish sulcal and gyral regions from each other. Then a multispectral optical flow (OF) warping procedure that aims to align the shape measure maps of an atlas and a subject brain's normalized maps is described. The variational problem to estimate the OF field is solved using a Euclidean framework. After warping one brain given the OF result, we obtain a better structural and functional alignment across multiple brains.This work was supported by the NIH/NINDS under grant R01NS37747. See http://iacl.ece.jhu.edu/d̃uygu/research/Pubs.html for color version of figures. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
227. Cortical surface reconstruction using a topology preserving geometric deformable model.
- Author
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Xiao Han, Chenyang Xu, Duygu Tosun, and Prince, J.L.
- Published
- 2001
- Full Text
- View/download PDF
228. Calculation of human cerebral cortical thickness on opposing sulcalanks
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Duygu Tosun, Chenyang Xu, Xiaodong Tao, Maryam E. Rettmann, Xiao Han, and Jerry L. Prince
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Neurology ,Cognitive Neuroscience ,Geology - Published
- 2001
229. Patterns of Reduced Cortical Thickness in Late-Life Depression and Relationship to Psychotherapeutic Response.
- Author
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Mackin, R. Scott, Duygu Tosun, Mueller, Susanne G., Jun-Young Lee, Insel, Philip, Schuff, Norbert, Truran-Sacrey, Diana, Arean, Patricia, Nelson, J. Craig, and Weiner, Michael W.
- Abstract
The article looks at reduced brain cortical thickness and atrophy related to the risk of major depression disorder in older patients, as well as their response to psychotherapy. Subjects received magnetic resonance imaging (MRI) and mapping of the brain before and after a 12-week psychotherapy program. Thinning in the right frontal, parietal, and temporal cortices was associated with late-life depression, and poor psychotherapy outcomes were linked to bilateral and distributed atrophy.
- Published
- 2013
- Full Text
- View/download PDF
230. Genetic relationship among autochthonous grapevine cultivars in Bosnia and Herzegovina
- Author
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Leko, M., Žulj Mihaljević, M., Beljo, J., Šimon, Silvio, Sabljo, A., Pejić, Ivan, and Murat YERCAN, Duygu TOSUN, Zubeyde ALBAYRAM
- Subjects
Autochthonous varieties ,grapevine ,genetic relationship ,SSR - Abstract
Grapevine growing area of Bosnia and Herzegovina is limited by surface, but in spite of this fact, there is a great number of autochthonous varieties. A small number of them have a greater commercial significance, while most of them are grown at a small scale. However, their genetic inter-relationships are presently unknown. The aim of this study was to genotype 26 accessions of native grapevine varieties from Bosnia and Herzegovina and to determine the number and frequency of alleles within this population. This should put more light on level of genetic diversity among studied accessions, as well as determine possible synonyms and homonyms. Genetic profile of each variety was produced with SSR markers at nine loci. On the basis of obtained results coefficient of genetic similarity was computed. The mean number of alleles per locus was 7, 33 and observed heterozygosity over all loci was 0, 77. Five clusters of identical genotypes were found ; some of them were expected, and some were not. Synonyms and homonyms were also found within the analyzed accessions. The coefficient of genetic similarity shows that there is a significant level of genetic distance and diversity among the tested varieties. This fact suggests that the grapevine varieties from Bosnia and Herzegovina may have different genetic and geographical origins. To further elaborate this, genetic relationship of grapevine varieties from Bosnia and Herzegovina and varieties from neighboring and distant areas, should be analyzed.
- Published
- 2013
231. Characterization of apple germplasm from on-farm collections located in the municipality Stari Grad, Sarajevo
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Gaši, F., Topuz, H., Kurtović, M., Hadžimurtezić, F., Grahić, J., Šimon, Silvio, and Murat YERCAN, Duygu TOSUN, Zubeyde ALBAYRAM
- Subjects
Microsatellite ,apple ,plant genetic resources - Abstract
Ten microsatellite markers used in a previous study on the autochthonous apple germplasm in Bosnia and Herzegovina managed to differentiate the autochthonous apple cultivars from the international ones. The molecular data also allowed the discrimination between autochthonous apple accessions introduced during Ottoman Empire and those brought to this country during the Austria-Hungary rule over Bosnia and Herzegovina. In this study the same SSR primers were used to examine 31 apple accessions from on-farm collections located in the Municipality Stari Grad, Sarajevo. A number of new alleles that were not amplified in the previous study were detected. Among the analysed accessions several homonyms and synonyms were detected. Some of the apple genotypes were in fact international, commercial cultivars, while many others can be considered autochthonous. We propose a wider regional study, using the same methodology, which might yield interesting results from the aspect of plant genetic resources.
- Published
- 2013
232. Bread making quality and storage proteins of wheat cultivars grown at the Agricultural Institute Osijek
- Author
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Horvat, Daniela, Drezner, Georg, Sudar, Rezica, Dvojkovic, Krešimir, Simic, Gordana, Spanic, Valentina, and Murat Yercan, Duygu Tosun, Zubeyde Albayram
- Subjects
food and beverages ,wheat cultivars ,bread making quality ,endosperm storage proteins - Abstract
Bread making quality and wheat storage proteins of 12 winter wheat cultivars grown at the experimental field of the Agricultural Institute Osijek were studied. The protein content varied from 12.4 to 16.4%. Dough rheological parameters as indicators of gluten strength varied between weak to very strong. Allelic variations at Glu-1 loci analyzed by SDS-PAGE method showed that HMW subunits 2* at the Glu-A1 locus, 7+9 at the Glu-B1 locus and 5+10 at the Glu-D1 locus were dominant in analyzed cultivars. Regarding the quantitative results of storage proteins obtained by RP-HPLC method a specific differences among cultivars was noticed. Within the storage proteins, the _- gliadins (27.5%), LMW glutenins (34.0%) and _- gliadins (20.3%) were generally major components, while _- gliadins (3.7%), HMW glutenins (8.9%) and albumis and globulins (14.6%) were minor ones. Results of the linear correlation (p
- Published
- 2012
233. Traits of wheat varieties created in the last 100 years
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Drezner, Georg, Spanic, Valentina, Dvojkovic, Kresimir, Horvat, Daniela, Novoselovic, Dario, and Murat Yercan, Duygu Tosun, Zubeyde Albayram
- Subjects
wheat ,varieties ,traits ,years - Abstract
In Osijek (eastern Croatia) during the three years experiments were set up, with 25 wheat varieties developed in the last 100 years from Croatia, Italy, Romania, France and Russia. After harvest we determined differences in selected traits. The sum of precipitation in growing season during 2008/09, 2009/10 and 2010/11 were 368.6 mm, 846.6 mm and 500.4mm. Grain yield, plant height, heading date, 1000 kernel weight, test weight and protein content were analyzed. Highly significant differences between varieties and years were revealed for the traits. The highest grain yield had varieties Katarina, Alka and Renata. Alka and Katarina had yields in average 15% higher compared with Slavonia (Saray Bosna, Brasilia), 18% higher than Dropia and Flamura 85, 30% higher than Bezostaja 1 and about 54% higher than Sirban Prolifik and U1. In both dry years the highest grain yield had varieties Alka, Katarina, Renata and Lucija. In a rainy year, all varieties had significantly lower grain yields, lower 1000 kernel weight and test weight, but higher protein content, and the highest grain yield had varieties Demetra, Katarina, Dropia, Zitarka and Alka. The lowest grain yield in all three years of research had varieties U1 (introduced in the production in 1936), Sirban Prolifik (introduced in the production in 1905) and Dubrava (recognized in1968). The oldest varieties Sirban Prolifik and U1 were 130-140 cm high, 7-14 days later in heading date with significantly higher protein content (not god quality of gluten) than varieties developed in the last twenty years.
- Published
- 2012
234. Determening the identity of a promising new sour cherry cultivar using SSR markers
- Author
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Gaši, F., Memić, S., Kurtović, M., Drkenda, P., Skender, A., Šimon, Silvio, and Murat YERCAN, Duygu TOSUN, Zubeyde ALBAYRAM
- Subjects
Sour cherry ,microsatellite ,genetic similarity - Abstract
The genetic identity of a promising new sour cherry (Prunus cerasus) cultivar ‘eli ka’ was examined using seven microsatellite markers developed from peach (Prunus persica). Along with the previously mentioned cultivar, four international, commercial cultivars (‘Schatten morelle’, ‘Rexelle’, ‘Doubbele Gorsem Kreiek', 'Heimanns Konservenweichsel') and two most commonly grown regional cultivars (‘Maraska’ and ‘Obla inska’) were also analyzed. Seven primer pairs managed to amplify 46 different alleles, as well as distinguish all the analyzed genotypes. UPGMA dendrogram based on genetic similarity (Dice) was constructed in order to examine the relationships of the analyzed cultivars. ‘Rexelle’, ‘Doubbele Gorsem Kreiek', 'Heimanns Konservenweichsel' clustered tightly with ‘Schatten morelle’, which is not surprising considering the fact that these three cultivars are supposed spontaneous seedlings of ‘Schatten morelle’. The new cultivar ‘eli ka’ also displayed very high level of genetic similarity with ‘Schatten morelle’ indicating that even this new genotype might be a spontaneous seedling of the famous cultivar. The cluster analysis showed that the examined ‘Maraska’ and ‘Obla inska’ genotypes grouped very closely together. This may indicate a recent common ancestor or hybridization events, especially since ‘Maraska’ and ‘Obla inska’ fit more the description of populations than that of classic cultivars.
- Published
- 2012
235. SSR profile survey of winter and spring barley compared to malt quality data
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Abičić, Ivan, Lalić, Alojzije, Šimić, Gordana, Šimon, Silvio, Pejić, Ivan, and Murat YERCAN, Duygu TOSUN, Zubeyde ALBAYRAM
- Subjects
Barley ,breeding ,polymorphism ,SSR ,quality - Abstract
In this research we identified certain analogy between SSR polymorphism of referent foreign quality varieties (Vanessa – winter type and Scarlett – spring type) with two varieties of winter (Zlatko and Barun) and two of the spring barley types (Fran and Matej) from the Agricultural Institute Osijek breeding program. Malt quality characteristics such as malt extract, viscosity and friability were run through three consecutive years (2004, 2005 and 2006) at two locations (Osijek and Nova Gradiska). The correlation between SSR polymorphism and malt quality measurement values has been examined in order to attain certain level of marker diagnostic ability. Seven SSR markers previously described in literature as potential detectors of certain chromosomal regions of interest were used, as follows: malt extract (EBmac415 and EBmac501), viscosity (Bmag211 and Bmag337) and friability (HVM40, Bmag120 and Bmag7). According to quality data in general, spring barley cultivars when compared with winter cultivars had significantly higher malt extract content (80.57 ; 79.65), lower malt viscosity (1.588 ; 1.682), higher friability (52.61 ; 65.88) together with specific interactions with growing conditions. This distinction between winter and spring types of barley in a sense of genotype correlates to UPGMA dendrograms for observed traits, related markers and also to variability within observed germplasm (foreign vs. domestic varieties).
- Published
- 2012
236. Grain yield and quality of wheat cultivars – preliminary results from Altinova field trial
- Author
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Dvojkovic, Kresimir, Drezner, Georg, Akkurt, Hamdi, Zdunic, Zvonimir, Horvat, Daniela, Novoselovic, Dario, Spanic, Valentina, and Murat Yercan, Duygu Tosun, Zubeyde Albayram
- Subjects
wheat ,grain yield ,quality - Abstract
Testing of winter wheat cultivars grain yield and quality attributes in comparative field trials is one of the primary steps in determination of genotype suitability for particular growing conditions. With that objective field experiment with seven winter wheat cultivars of Croatian origin (Alka, Katarina, Felix, Renata, Olimpija, Lela and Slavonija-Saray Bosna) and winter wheat cultivar Flamura 85 (Romanian origin), which was used in form of standard, was set up as randomized complete block design (RCBD) in four repetitions at Altinova location (Balikesir Province) in the year 2010. Grain yield, test weight, thousand kernel weight, protein content, wet gluten content, sedimentation value of flour and rheological parameters were measured. Among tested cultivars were found statistically significant differences for grain yield. The highest grain yield achieved cultivars Alka, Flamura 85, Felix and Katarina. The highest average values of test weight showed cultivars Slavonija (Saray Bosna), Flamura 85, Lela and Olimpija while the highest thousand kernel weight were found for cultivars Flamura 85, Olimpija and Renata. Cultivars Felix, Lela and Renata achieved the highest protein and wet gluten content, while only for cultivar Slavonija (Saray Bosna) were found sedimentation value of flour above 60 ml. All cultivars showed medium and good to very good dough rheological parameters.
- Published
- 2012
237. Malt quality traits of barley cultivars grown at the Agricultural Institute Osijek
- Author
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Šimić, Gordana, Lalić, Alojzije, Abičić, Ivan, Horvat Daniela, and Murat YERCAN, Duygu TOSUN, Zubeyde ALBAYRAM
- Subjects
barley cultivars ,malt quality traits ,micro-malting - Abstract
Grain and malt traits important for malting quality were studied on a set of 6 barley genotypes grown at location of eastern Croatia for three seasons (2009, 2010 and 2011). Malting of samples was done with Joe White automatic micro-malting system. Statistically justified differences in results of malt extract content and wort viscosity were found both between cultivars and years. Malt extract content varied from 74.88% (Osk.5.161/3-06 in 2010) to 80.60% (Lukas in 2009). The results of determination of wort viscosity ranged from 1.4765 mPas (Vanessa in 2010) to 2.4994 mPas (Bravo in 2009). Regarding the results of the analysis of friability and Kolbach Index data observed, there were also statistically significant differences between cultivars and years included in this study. Significantly higher friability means were noticed in cultivar Vanessa (60.36%) and in 2009 year (54.47%). Cultivar Lukas resulted in significantly higher Kolbach Index (37.07%), while the year 2010 resulted in significantly lower mean of Kolbach Index (34.46%).
- Published
- 2012
238. Stability of Quality Parameters in Different Environmental Conditions
- Author
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Španic, Valentina, Georg Drezner, Daniela Horvat, Kresimir Dvojković, and Murat YERCAN, Duygu TOSUN, Zubeyde ALBAYRAM
- Subjects
environment ,wheat ,quality - Abstract
Quantitative traits are the result of genotype, environment and their interactions. Because of that it is difficult to compare values reported for the protein content of grain grown in different locations or in different years. Anyway breeding programm should focus on high protein content although generally exist the negative correlation between protein content and yield. To obtain information about the reaction of winter wheat genotypes to different environmental conditions, experiments were set up with 18 winter wheat genotypes in four replications at four locations with different soil types in two seasons. Protein content, wet gluten content and sedimentation value were analyzed. The genotype Divana had a high mean protein content accompained with a high positive interaction. The genotypes Golubica, Mihaela and Renata formed an adaptive group with moderate positive interaction and highly moderate mean for the protein content. Distribution of genotypes points in the AMMI II biplot revealed that the genotype Sana scattered closest to the origin, indicating minimal interaction of this genotype with environments. Wet gluten content ranged from 18.3 % (genotype Aida in Pozega 2009) to 39.3 % (genotype Golubica in Osijek 2010). The highest sedimentation value was obtained at location Osijek 2010 (genotypes Renata, Golubica, and Divana). Investigated quality parameters were highly correlated. This information is helpful in selecting proper genotypes for wheat breeders, growers, millers and bakers for their end products with desired quality characteristics, which should be combined with good rheological and agronomic traits.
- Published
- 2012
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