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Устойчивое развитие ООН : Устойчивые города и ... ✕Факультет / Институт : Fen Fakültesi ✕
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Устойчивые города и населенные пунктыСоздание инклюзивной, безопасной, прочной и устойчивой городской среды и жилых площадей
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H-infinity-NORM EVALUATION FOR A TRANSFER MATRIX VIA BISECTION ALGORITHM

Ercan ÇELİK

In this paper, we compute H.-norm of a transfer matrix, via bisection algorithm. The algorithm is given and applied some problems. The problems are choosen from various areas of control theory such as aircraft models and decentralized interconnected systems.

Статья 2022 Fen Fakültesi Thermal Science26 ( Special Issue: 2 ) 50 Просмотры
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Potential Impacts of Climate Change on Plant Diversity of Sary-Chelek Biosphere Reserve in Kyrgyzstan

Nazgül İMANBERDİYEVA | Zeki SEVEROĞLU

The Sary-Chelek Nature Reserve established in 1959 with an area of 239 km2 and declared as a UNESCO-MAB Biosphere Reserve in 1978 is located on the southeast-facing slope of the northern Chatkal Range in central Jalalabad province. It is centered around the scenic Sary-Chelek Lake. The mountains immediately surrounding the lake abound in exceptionally diverse flora and fauna, what may be the widest variety found in the Tian Shan. The area is spread over varied ecosystems and habitats, which include the forests of spruce and juniper together with the forests of wild fruits and nuts and riparian ...Более

Глава книги 2018 Fen Fakültesi Vegetation of Central Asia and Environs ( Chapter 15 ) 52 Просмотры
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The inequalities on dual numbers and their topological structures

Olgun DURMAZ

Inequalities are frequently used in various fields of mathematics to prove theorems. The existence of inequalities contributes significantly to the foundations of such branches. In this paper, we study the properties of order relations in the system of dual numbers, which is inspired by order relations defined on real numbers. Besides, some special inequalities that are used in various fields of mathematics, such as Cauchy-Schwarz, Minkowski, and Chebyshev are studied in this framework. An example is also provided to validate our research findings. Keywords: dual numbers; dual absolute value; ...Более

Статья 2023 Fen Fakültesi Turkish Journal of Mathematics47 ( 5 ) 28 Просмотры
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Assessment of Cd-induced genotoxic damage in Urtica pilulifera L. using RAPD-PCR analysis

İlhan DOĞAN

Plants can be used as biological indicators in assessing the damage done by bioaccumulation of heavy metals and their negative impact on the environment. In the present research, Roman nettle (Urtica pilulifera L.) was employed as a bioindicator for cadmium (Cd) pollution. The comparisons between unexposed and exposed plant samples revealed inhibition of the root growth (∼25.96% and ∼45.92% after treatment with 100 and 200 µmol/L Cd concentrations, respectively), reduction in the total soluble protein quantities (∼53.92% and ∼66.29% after treatment with 100 and 200 µmol/L Cd concentrations, re ...Более

Статья 2016 Fen Fakültesi Biotechnology and Biotechnological Equipment30 ( 2 ) 108 Просмотры
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Detection of physiological and genotoxic damages reflecting toxicity in Kalanchoe clones

İlhan DOĞAN

In order to make assessments in understanding of physiological and genotoxic effects of imposing cadmium (Cd) on photosynthetic pigment contents along with the changes occurring in genetic material of Kalanchoe plants were used in relation to various Cd-treatments. Young plantlets were originated from a single host plant as clones, and developed in vitro. Developed clones were grown in standard pots with daily watering of Hoagland solution (20 ml) containing different concentrations of cadmium chloride for two months. Cd concentrations of the collected samples were measured by employing ICP-OE ...Более

Статья 2016 Fen Fakültesi Global NEST Journal18 ( 1 ) 101 Просмотры
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The usability of Juniperus virginiana L. as a biomonitor of heavy metal pollution in Bishkek City, Kyrgyzstan

Zeki SEVEROĞLU | İlhan DOĞAN | Gülbübü KURMANBEKOVA

Uncontrolled and unplanned urbanization and industrialization due to increase of population and rapid industrial development have created severe environmental problems in Kyrgyzstan during the last few decades. In this study, Juniperus virginiana, a dioecious species, was employed in order to make assessment of the heavy metal pollution rate in the area and of the heavy metal pollution impact on the mineral nutrient status of the plant. For this study, leaf (washed and unwashed) and bark samples of J. virginiana, and its co-located soil samples were collected from eight different stations, all ...Более

Статья 2015 Fen Fakültesi Biotechnology and Biotechnological Equipment29 ( 6 ) 128 Просмотры
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Cadmium-induced physiological and genotoxic alterations in Bryophyllum daigremontianum

Zeki SEVEROĞLU

When evaluating the negative impacts of heavy metals in the environment, plants can be used as biological indicators in assessing damage done by bio-accumulation of heavy metals. For detecting the genotoxic effects of heavy metals, the RAPD-PCR technique is applied in plants. In this study, Blyophyllum daigremontianum was used as a bio-indicator for Cadmium (Cd) pollution. B. daigremontianum plantlets were obtained from bulbiliferous spurs. They were grown singly in standard pots and each of the experimental groups of 5 replicates were watered daily with Hoagland solution (20 ml) containing 0, ...Более

Доклады конференции 2013 Fen Fakültesi Proceedings of the International Conference on Environmental Science and Technology 28 Просмотры
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Method of spherical harmonic series in the problem of minimization of atmosphere pollution by fractions of harmful admixtures

Ramiz RAFATOV

The problem of minimization of atmosphere pollution by fractions of harmful admixtures is studied. It is supposed that a controlled object is described by non-stationary integral–differential transfer equation with special boundary conditions and control parameters, which are included in the right part of equation as delta-functions. Minimized integral quadratic functional characterizes energy expenditure for control and depends on the average squared deflection of fraction concentration from the desired final state. Optimal conditions are obtained with the help of Pontryagin’s maximum princip ...Более

Доклады конференции 2004 Fen Fakültesi Mathematics and Computers in Simulation67 ( 4–5 ) 95 Просмотры
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An investigation on environmental pollution due to essential heavy metals: a prediction model through multilayer perceptrons

İbrahim İlker ÖZYİĞİT

This research is to predict heavy metal levels in plants, particularly in Robinia pseudoacacia L., and soils using an effective artificial intelligence approach with some ecological parameters, thereby significantly eliminating common defects such as high cost and seriously tedious and time-consuming laboratory procedures. In this respect, the artificial neural network (ANN) is employed to estimate the concentrations of essential heavy metals such as Fe, Mn and Ni, depending on the Cu and Zn concentrations of plant and soil samples collected from five different locations. The derived relative ...Более

Статья 2022 Fen Fakültesi International Journal of Phytoremediation25 ( 1 ) 104 Просмотры
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Comparative analyses of phytochelatin synthase (PCS) genes in higher plants

İbrahim İlker ÖZYİĞİT

Plants employ various defence strategies to ameliorate the effects of heavy metal exposures, leading to re-establishment of metal homeostasis. One of the strategies includes the biosynthesis of main heavy metal detoxifying peptides phytochelatins (PCs) by phytochelatin synthase (PCS). In the present study, 14 PCS homologues were identified in the genomes of 10 selected plants. The size of these PCSs was 452-545 amino acid residues, with characteristic phytochelatin and phytochelatin_C domains. The N-terminal site of the proteins is highly conserved, whereas the C-terminal site is less conserve ...Более

Статья 2019 Fen Fakültesi Biotechnology and Biotechnological Equipment33 ( 1 ) 62 Просмотры
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MINERAL NUTRIENT COMPOSITIONS OF FIELD-GROWN WEED AND MAIZE (Zea mays L.) PLANTS IN TERMS OF COMPETITION

İbrahim İlker ÖZYİĞİT

Amaranthus retroflexus L., Convolvulus arvensis L., Cynodon dactylon (L.) Pers. var. villosus, Datura stramonium L., Echinochloa crus-galli (L.) Beauv and Portulaca oleracea L. are weeds commonly seen in agricultural fields. Weeds pose serious threat to agricultural production. This study focuses on mineral nutrient uptake competition arisen between maize and weed species. Maize (Zea mays L.) was planted in a model field in Emirli Village-Istanbul/Turkey and the above-mentioned weeds were allowed to be grown along with maize. Then, weed and maize species along with their co-located soil sample ...Более

Статья 2021 Fen Fakültesi Pakistan Journal of Agricultural Sciences58 ( 1 ) 30 Просмотры
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Assessment of pollution at the former uranium waste dumpsite near kaji-Say Village/Kyrgyzstan: a genetic and physiological investigation

İbrahim İlker ÖZYİĞİT | Bermet KIDIRALİYEVA | Kadırbay ÇEKİROV | Gülbübü KURMANBEKOVA | Nurzat ŞAYKİYEVA

Kyrgyzstan still suffers from the past practices of radioactive industry operated by the Soviet Union that caused significant impact on ecosystems in this region, especially related with storage of uranium in inadequate conditions. There are at least 50 abandoned sites used as radioactive waste dumps in the country. Due to the pressure of natural and anthropogenic reasons, the structural foundations of mine waste dumps are gradually losing their integrities. Here, particular interest of our research is to reveal current state of radioactive contamination and to make evaluation on the radiologi ...Более

Статья 2021 Fen Fakültesi Journal of Radiation Research and Applied Sciences14 ( 1 ) 118 Просмотры
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