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Bilateral Macular Hole Following Myopic Photorefractive Keratectomy
Nasser Shoeibi,Mohammad Hossein Jabbarpoor Bonyadi,Majid Abrishami,Mohammad-reza Ansari-Astaneh 대한안과학회 2014 Korean Journal of Ophthalmology Vol.28 No.3
A 42-year-old man was admitted to our clinic complaining of visual distortion in his left eye two monthsafter bilateral myopic photorefractive keratectomy (PRK). Macular optical coherence tomography (OCT)showed a stage II macular hole in the left eye. Simultaneous OCT in the right eye showed vitreous tractionand distortion of the outer retina. One month later, the patient underwent vitrectomy for the left eye, andthe macular hole was closed. Two months after that, the patient complained of visual distortion in the righteye, and OCT revealed increased traction and accentuated outer retinal distortion indicating a stage IBmacular hole. Traction attenuated later without any intervention. The short interval between PRK and holeformation, bilateral involvement, and the moderate refractive error in this case highlight the possible role ofPRK in aggravating vitreoretinal interface abnormalities. We recommend the addition of PRK to the list ofprocedures that may be associated with the formation of a macular hole.
Response to Drought Stress of Two Strawberry Cultivars (cv. Kurdistan and Selva)
Nasser Ghaderi,Adell Siosemardeh 한국원예학회 2011 Horticulture, Environment, and Biotechnology Vol.52 No.1
In order to evaluate the effect of different levels of drought stress on some physiological parameters in strawberry, one experiment with potted strawberry cultivars ‘Kurdistan’ and ‘Selva’ was conducted in summer 2008. The experiment was performed with four drought stress treatments [control (75% of field capacity), S1: mild drought stress (50% of field capacity), S2: severe drought stress (25% of field capacity) and R: one day after rewatering]. Physiological parameters such as: leaf relative water content (RWC), membrane stability index (MSI), net CO2 assimilation rate (A), stomatal conductance (gs), transpiration (E), water use efficiency (A/gs), chlorophyll, proline and soluble carbohydrate contents were measured in leaves of strawberry subjected to different drought stress conditions as well as one day after rewatering. The results showed that RWC, MSI, A, gs, E, and chlorophyll of two cultivars decreased as soil water content was reduced. A/gs was highest under mild water stress for both cultivars. ‘Kurdistan’ had lower A, gs and E than ‘Selva’. RWC, MSI and A/gs of ‘Kurdistan’ were higher than ‘Selva’. Recovery of these parameters was faster for ‘Kurdistan’ than ‘Selva’. Chlorophyll contents of ‘Kurdistan’ was higher than ‘Selva’. Chlorophyll recovery didn’t occur one day after rewatering. Amount of proline and soluble carbohydrates increased under severe drought stress. ‘Kurdistan’ had higher proline content compared to ‘Selva’ under severe drought stress. Amount of proline and soluble carbohydrates were reduced in both the cultivars one day after rewatering. This study revealed that moderate drought stress affects gas exchange while severe drought stress affects chlorophyll, proline and soluble carbohydrates levels.
Modeling Dynamic Business Rules using A Dynamic Knowledge Approach
Nasser Karami,Junichi Iijima 대한산업공학회 2007 Industrial Engineeering & Management Systems Vol.6 No.1
Business Rules are formal statements about the data and processes of an enterprise. They present projections of the organization’s constraints and ways of working on their supporting information systems. Therefore, their collection, structuring and organization should be central activities within information systems. In an enterprise, business rules are used to represent certain aspects of a business domain (static rules) or business policy (dynamic rules). Hence, regarding problem domains in the organization, business rules are classified into two groups: static and dynamic business rules. The paper introduces a new concept of business rules, Extended Dynamic Business Rule (EDBR) which contains the results of the occurrence of business rule’s action. The focus of this paper is in the organizing, defining and modeling of such business rules using Mineau’s approach. Mineau’s approach is an extension of Sowa’s Conceptual Graph theory.
Frameshift Deletion Mechanisms in Egyptian Duchenne and Becker Muscular Dystrophy Families
Nasser Attia Elhawary 한국분자세포생물학회 2004 Molecules and cells Vol.18 No.2
Partial gene deletion is the major type of mutation leading to Duchenne muscular dystrophy (DMD) and its mild allelic form, Becker muscular dystrophy (BMD). Amplification of the genomic DNAs of 152 unrelated dystrophin patients using multiple primers detected 78 (51.3%) probands with deletion mutations. We predicted the translational reading frame for all the deletions in Egyptian dystrophin males. The frameshift rule was confirmed positively ranging for 50 to 67% of the cases depending on the type of disease. We discuss ways of accounting for some exceptions from the frameshift hypothesis in the central and proximal regions. These explanations may help in developing procedures for reducing the severity of dystrophin phenotypes to restore the correct frame by disrupting the translational fidelity. Great efforts have been put into the development of effective ‘gene correction’ procedures via such intrinsic mechanisms. In addition, we mapped regional difference in deletion mutation frequencies within the DMD gene locus between the different Egyptian governorates. There were no double deletions in the Egyptian dystrophin males.
( Nasser Rashidi ),( Negar Khosravi ) 범태평양응용언어학회 2010 범태평양응용언어학회지 Vol.14 No.1
This study was conducted to investigate the extent to which scores on depth and breadth of vocabulary knowledge as two dimensions of vocabulary knowledge would contribute to predicting the EFL learners` reading performance with a minimum vocabulary size of 3000 word families and also to find out the difference, if any, between the reading comprehension performance of two groups as having high and low depth and breadth of vocabulary knowledge. All instruments (Word-Associate Test (WAT) (Read, 1993) measuring depth of vocabulary knowledge (DVK), Vocabulary Levels Test (VLT) (Nation, 1983) measuring vocabulary size (VS), and Reading Comprehension Test (RC) were administered together within the same session to 38 Iranian senior university students. Then the gathered data were analyzed by a Pearson correlation and two Independent T-tests. Results revealed that a) the interrelations among DVK, VS, and RC were high and positive; b) depth of vocabulary knowledge provided a significant contribution to the prediction of reading comprehension; and c) the students who had stronger depth and breadth of vocabulary knowledge performed better on reading comprehension. These findings provided empirical support for the importance of depth of vocabulary knowledge in reading comprehension. Regarding this, the necessity of incorporating this aspect into EFL programs and activities is desirable.
Prediction of thickness and fouling rate in pulsating flow heat exchangers, using FLUENT simulator
Nasser Saghatoleslami,Mehdi Koolivand Salooki,Mohammad Ali Armin 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
Heat exchangers are an important part of industrial processes as they handle a major portion of total energy consumption. Fouling could have serious impact on their performance and hence affect the economic performance of the process plant. The aim of this work was to simulate the crystallization fouling process in a heat exchanger by developing a C++ program and adopting UDF functions through Fluent software; and hence evaluate all the given models and consequently implement the model which would best suit our particular case. The finding of this work would enable us to evaluate the thickness and fouling rate in the heat exchangers. Furthermore, the effect of pulsating flow on the crystallization fouling of calcium sulfate (CaSO4) in the heat exchanger was also investigated, and the effect of operation of different amplitude of the oscillations (10-70) and frequencies (1.59-12.73 Hz) on the fouling of this compound was studied.
Low-clock-speed time-interleaved architecture for a polar delta-sigma modulator transmitter
Nasser Erfani Majd,Rezvan Fani Electronics and Telecommunications Research Instit 2023 ETRI Journal Vol.45 No.1
The polar delta-sigma modulator (DSM) transmitter architecture exhibits good coding efficiency and can be used for software-defined radio applications. However, the necessity of high clock speed is one of the major drawbacks of using this transmitter architecture. This study proposes a low-complexity timeinterleaved architecture for the polar DSM transmitter baseband part to reduce the clock speed requirement of the polar DSM transmitter using an upsampling technique. Simulations show that using the proposed four-branch timeinterleaved polar DSM transmitter baseband part, the clock speed requirement of the transmitter is reduced by four times without degrading the signal-tonoise-and-distortion ratio.