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Öğe Factors affecting complication rates of percutaneous nephrolithotomy in children: Results of a multi-institutional retrospective analysis by the Turkish pediatric urology society(2014) Önal B.; Dogan H.S.; Satar N.; Bilen C.Y.; Güneş A.; Özden E.; Ozturk A.; Demirci D.; Istanbulluoglu O.; Gurocak S.; Nazli O.; Tanriverdi O.; Kefi A.; Korgali E.; Silay M.S.; Inci K.; Izol V.; Altintas R.; Kilicarslan H.; Sarikaya S.; Yalcin V.; Aygun C.; Gevher F.; Aridogan I.A.; Tekgul S.Purpose We assessed factors affecting complication rates of percutaneous nephrolithotomy in children. Materials and Methods We retrospectively evaluated data on 1,205 renal units in 1,157 children treated with percutaneous nephrolithotomy at 16 Turkish centers between 1991 and 2012. Of the patients 28.3% had a history of urolithiasis. Complications were evaluated according to the Satava classification system and modified Clavien grading system. Univariate and multivariate analyses were done to determine predictive factors affecting complication rates. Results A total of 515 females and 642 males were studied. Mean ± SD patient age was 8.8 ± 4.7 years (range 4 months to 17 years). Mean ± SD stone size, operative time and postoperative hospital stay were 4.09 ± 4.06 cm2, 93.5 ± 48.6 minutes and 5.1 ± 3.3 days, respectively. Postoperative stone-free rate was 81.6%. A total of 359 complications occurred in 334 renal units (27.7%). Complications were intraoperative in 118 cases and postoperative in 241. While univariate analysis revealed that stone history, positive urine culture, operative time, length of hospitalization, treatment success, punctured calyx and location of the stone significantly affected the complication rates (p <0.05), operative time, sheath size, mid calyceal puncture and partial staghorn formation were the statistically significant parameters affecting complication rates on multivariate logistic regression analysis. Conclusions Percutaneous nephrolithotomy is the treatment of choice for most renal calculi in children. The technique is effective and safe in children, with a high success rate and a low rate of major complications. The significant factors identified should be considered by clinicians to decrease associated complication rates. © 2014 by AMERICAN UROLOGICAL ASSOCIATION EDUCATION AND RESEARCH, INC.Öğe Land use changes in gediz delta (Turkey) and their negative impacts on wetland habitats(Coastal Education Research Foundation Inc., 2014) Bolca M.; Özen F.; Güneş A.In this research, we investigate Izmir Bird Paradise, which is located on the coast of Gediz Delta (Turkey) and is protected via the Convention on Wetlands of International Importance, Especially as Waterfowl Habitat (International Ramsar Agreement). We determined land use changes in salty-alkali areas and changes in biological habitats by using remote sensing techniques and geographic information systems (GIS). We determined temporal changes in different types of land by using 1/20,000 scaled aerial photos of the research area from 1963 and 1996 and Quickbird satellite images with 61-cm resolution from 2005 and 2010. We noted existing biological changes in the same period by associating them with different land use types. At the end of the research, we studied changes to biological habitats in wetlands in coastal Gediz Delta due to the pressures of urban and industrial settlements and agricultural areas. According to the data, between 1963 and 2010 there was a ~84.40% increase in urban-industrial settlements, a ~13.74% increase in agricultural areas, and a ~65.59% increase in saltpan areas. On the other hand, there was a ~37.65% decrease in habitat and nutrition areas of biological variations (bird habitat, wetland flora, and fauna), a ~41.54% decrease in coastal-sand dune-salty alkali areas, and a ~30.63% decrease in swamp and wetland areas. As a result of these changes, numerous species in the wetlands have died or decreased. © Coastal Education & Research Foundation 2014.Öğe Performance analysis of nonwoven polyester geotextiles used for slope stabilization on landscape reclamation applications(2013) Güneş A.; Akat O.; Cakar H.; Yucel O.Technical textiles, being the fastest growing area of textiles sector, are nowadays applied to several areas. Geotextiles, which is one of the application areas of technical textiles, are defined as any permeable textile material that are used with foundation, soil, rock, earth, etc. to increase stability and decrease wind and water erosion. Because of their technical advantages and low cost solutions, geotextiles have an important place in civil engineering. In this study, the performance analysis of nonwoven polyester geotextiles used for slope stabilization in landscape reclamation applications is examined in Aegean region, Izmir city rainfall conditions. For this aim, five stations having different degrees of slope, in order to determine the soil retention capacity of nonwoven polyester geotextiles having different weights, were built. These stations were slated to the system proposed by IUFRO (International Union of Forest Organizations). To carry out this research, climatic data of the Aegean region, in the city of Izmir, were used.Öğe The water quality effects of Salvinia natans and Lemna minor plant which used for rehabilitation of wastewater on the artificial wetlands [Yapay sulak alanlarda atik su rehabilitasyonunda kullanilan Salvinia natans ve Lemna minor bitki türlerinin su kalitesine olan etkileri](Refik Saydam National Public Health Agency (RSNPHA), 2017) Güneş A.; Kumar R.; Pek T.; Yüksel M.; Kabay N.Purpose of the study is the determination of the water treatment potentials of some plant species used in waste water treatment with artificial wetland systems, which is a natural alternative to physical and chemical treatment methods. For this purpose, the performances of Salvinia natans and Lemna minor aquatic plants which are alternatives to known species such as reeds and water hyacinth which are mainly used in systems have been investigated. Changes in wastewater pollution rates of plants treated with wastewater from the ITOB (Izmir Trade Organized Industrial Zone) Organized Industrial Zone for six weeks were monitored by spectrophotometric analysis and measurements using Hach Lange analysis instruments. As a result, plants were found to be effective in removing total nitrogen and phosphorus from wastewaters, and the results showed that Lemna minor plant increased the amount of dissolved oxygen in water more than Salvinia natans.
