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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
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Black Sea Journal of Engineering and Science
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  This is an Open Access Journal Open Access journal
ISSN (Online) 2619-8991
Published by DergiPark Homepage  [187 journals]
  • Biochemical Functions of Nesfatin-1

    • Authors: Nedim Murat YAVUZ
      Abstract: It was first discovered in 2006 and secreted in the hypothalamus region of the brain and was defined as a molecule that has an important task in regulating nutritional behavior. The pioneer is NUCB2 (ProneSfatin) and is an 82 amino acidity peptide that suppresses food intake. Nesfatin-1 hormone; It is secreted in the brain, heart, adipose tissue, stomach (mucosa), duhedonum, pancreas, pituitary gland and testis. It has a long -term effect on body temperature and may cause hyperglycemia and hyperinsulinemia of blood plasma levels and play a role in the development of polycystic ovary syndrome. Nesfatin-1hormone suppresses contraction and relaxation without affecting the coronary motility. If a study aimed at reducing oxidative stress in the testist, it was seen that it has no significant effect. In addition, the level of level in blood plasma is considered to be the main cause of anorexia in iron deficiency anemia, as well as play an important role in preventing body fluid homeostasis and dehydration -related anorexia.
      PubDate: Fri, 01 Jul 2022 00:00:00 +030
  • Antioxidant and Antimicrobial Activities of Extracts Obtained from
           Different Organs of Heliotropium Myosotoides and Heliotropium Suaveolens

    • Authors: Nezahat KANDEMİR; Şevket KANDEMİR, Emine ÇELİKOĞLU, Umut ÇELİKOĞLU, Önder İDİL
      Abstract: In this article, antioxidant, antimicrobial activities and effects on DNA damage of extracts obtained from different organs of Heliotropium suaveolens and Heliotropium myosotoides were evaluated. Hexane, ethanol and ethyl acetate were applied to the different organs in vegetative and generative growth periods of H. suaveolens, to the above-below-grounds organs in the vegetative and generative growth periods of H. myosotoides. Later, plant extracts were dissolved in DMSO and used in antioxidant, antimicrobial and plasmid DNA studies. Strong antioxidant activity was seen in the ethanol extracts of the leaves in the vegetative growth period and in the leaf and flowers in the generative growth period of H. suaveolens. In hexane extracts of H. suaveolens, antioxidant activity was found in all organs in the vegetative and generative growth periods. However, it was determined that the stem in the vegetative growth period and the root and stem ethanol extracts in the generative growth period of H. suaveolens showed weak antioxidant activity. The ethanol and hexane extracts of the above-below ground organs in the generative growth period of H. myosotoides were seen to have to weak antioxidant activity. However, it was determined that ethanol, hexane and ethyl acetate extracts of these two species did not show antimicrobial activity and DNA damage. It has been suggested that the organs displaying antioxidant activity of H. suaveolens can be used in the preparation of various preparations in the perfumery and cosmetics industry and by honey producers due to the glycosides it contains.
      PubDate: Fri, 01 Jul 2022 00:00:00 +030
  • Single-cell C4 Photosynthesis

    • Authors: Buse ÇÖKMEZ; Yasemin ÖZDENER KÖMPE, Fazıl ÖZEN
      Abstract: Single-cell C4 photosynthesis is a set of molecular biochemical, molecular, anatomical features. Single C4 photosynthesis is estimated to have occurred in the Oligocene about 25-30 million ago due to decreased CO2 levels. In higher plants, the efficiency of photosynthesis at high temperatures is limited by the oxygenase activity of the Rubisco (Ribulose 1,5 bisphosphate carboxylase/oxygenase) enzyme. Some terrestrial plants have developed enhancing mechanisms for Rubisco's CO2 retention to minimize the amount of carbon lost by photorespiration, and single-cell C4 photosynthesis has evolved in two different cell types called mesophyll and bundle sheath cells. C4 photosynthesis dimorphic chloroplast structure varies in Kranz anatomy and biochemistry of the C4 pathway. Single-cell C4 photosynthesis in terrestrial plants in the mid-1960s in four species belonging to the family Cheponodiaceae (Bienertia aralospica, Bienertia cycloptera, Bienertia sinuspersici, Bienertia kavirense) was also discovered. Single-cell C4 photosynthesis in Hydrilla verticillata, an aquatic and facultative (living in both an oxygenated and oxygen-free environment) monocot plant, has been discovered. In recent years, many studies have continued to be carried out to determine the properties of C4 plants. In this review, it is aimed to examine the subjects such as Single-cell C4 photosynthesis in terrestrial and aquatic plants, mechanism and chemistry of C4 photosynthesis.
      PubDate: Fri, 01 Jul 2022 00:00:00 +030
  • Creating a Basic Level Digital Height Model with Unmanned Aerial Vehicle
           in Ore Fields, Harput Example

    • Authors: Selim TAŞKAYA
      Abstract: UAV (Unmanned Aerial Vehicle) has taken its place especially in the construction, mining and cartography sectors with the advancing technology. It has led to the minimization of the burden of parameters such as time, labor and cost. It is extremely easy to access the three-dimensional modeling, slope and cubage (volume) calculations of the region on which the flight is made, thanks to the balancing from the location coordinates of the relevant area from the UAV images, as well as the difference of the heights called Z. Possible volume calculations in open mining sites are also possible with UAV photogrammetry. In our study, it was tried to create a numerical elevation model of the red soil ore extracted to be used in ceramic works in the location called Alayaprak in the Harput District of Elazığ. A discussion was made about the formation of DEM (Digital Elevation Model) at a simple level. First of all, the coordinates of the points were determined by RTK (Real Time Kinematics) ground measurement from a total of 20 ground control points. Then, by taking an altitude of 45 meters, the columns were scanned with a UAV without RTK and their mean square deviations were evaluated. DEM (Digital Elevation Model) data was obtained by creating a point cloud by obtaining 17443.839 points with average balancing. By taking the ground measure range of 4.78 cm/pixel, the possibility of how many cubic meters of ore was investigated.
      PubDate: Fri, 01 Jul 2022 00:00:00 +030
  • Phylogenetic Relationship within the Genus Carcharhinus on the Basis of
           Lemon shark (N. brevirostris) Position

    • Authors: Mine DOSAY-AKBULUT
      Abstract: Many doubts have not been answered about the phylogenetic relationship of the sharks. The morphological models and molecular studies, frequently used these days, can put some species into different order or suborder. The sharks contain about 1% of all fishes, separated into 8 orders. Within these, the largest group is the genus Carcharhinus, which includes economically important sharks. A lot of different analyses were done to determine the relationship among these genera. Most of them indicate that phylogenetic relationships at most taxonomic levels remain mysterious for this genera. This study was applied to determine the interrelationship between Carcharhinus and Negaprion genera based on the lemon shark position and to find out the possible paraphyletic situation of genus Carcharhinus, via using ribosomal ITS2 region and mtDNA D-loop for comparison and to get more reliable findings. As a result, based on the ribosomal ITS2 analyses, the lemon shark is placed within the genus Carcharhinus, on the other hand, the lemon shark finds a place outside of the genus Carcarhinus according to the mtDNA D-loop analyses results. Different findings regarding the position of the lemon shark indicate that it is necessary for more accurate results of the study by using more samples and more gene data.
      PubDate: Fri, 01 Jul 2022 00:00:00 +030
  • Hazard Identification and Risk Analysis in Rebar Rolling Plant

    • Authors: Ayşenur USLU; Gül USLU
      Abstract: Employees are constantly in action for the production of goods and services in workplaces. These workplace activities affect the physical and mental health of the employees and cause occupational accidents. Elimination of these negativities is possible with the implementation of occupational health and safety services. Safety organisation is also very important in steel rolling mills so that employees are not exposed to danger. As in any other industry, steel rolling mill workers work with dangerous machinery that causes injury, disability and death. Safe working is an integral part of risk management. Risk management is the process of taking and implementing action to reduce the possibility of an assessed risk occurring. Therefore, known or tolerable risks are managed. In safe workplaces, productivity is high, work accidents and occupational diseases are low. Safe workplaces are only possible with risk management. In this study, the rolling mill area of a workplace producing rebar with the Fine-Kinney Method was analysed and the necessary precautions were listed. These measures are generally listed as; implementation of control protocols for the routine operation of the process, providing necessary occupational health and safety training for the personnel, providing the necessary information, repeating the training at regular intervals, following up the protective clothing and equipment to be used in the process, maintenance/repair of the units and the tools used. As a result of these measures, the degree of risk will be reduced to acceptable levels.
      PubDate: Fri, 01 Jul 2022 00:00:00 +030
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