480 research outputs found
istraživanje tiol-disulfidne homeostaze i razine albumina modificiranog ishemijom radi procjene oksidacijskog stresa u pasa sa štenećakom
This study aimed to investigate the diagnostic value of thiol/disulfide homeostasis (TDH) and ischemia-modified albumin (IMA) levels in evaluating oxidative stress in dogs with canine distemper. The study materials consisted of 24 cross-breed dogs: 18 dogs with canine distemper (CD group) and 6 healthy dogs as the control. Blood samples for analysis of antioxidant-oxidant parameters were taken from both groups. In addition to TDH parameters (native thiol [NT], total thiol [TT], and disulfide [Ds] levels and Ds/NT, Ds/TT, and NT/TT ratios), IMA and albumin (ALB) levels were also determined in the blood serum of the groups. The IMA levels of the CD group were significantly higher than the control group (P<0.05). Antioxidant parameters (NT, TT) and oxidant parameters (Ds, Ds/NT, and Ds/TT) both exhibited a significant positive correlation among themselves (P<0.01). The areas under the ROC curve of IMA, Ds/ NT, and Ds/TT were 0.78, 0.62, and 0.62 respectively. The high levels of IMA, Ds, Ds/NT, and Ds/TT and low levels of NT, TT, NT/TT and ALB in dogs with canine distemper can be used to assess the oxidative stress caused by the disease. Overall, the diagnostic performances of IMA, Ds/NT, and Ds/TT for detection of increased oxidative stress were similar, but IMA was superior.U ovom je radu istraživana dijagnostička vrijednost tiol-disulfidne homeostaze (TDH) i razine albumina modificiranog ishemijom (IMA) u procjeni oksidacijskog stresa u pasa sa štenećakom. Uključena su 24 psa križanca: 18 pasa sa štenećakom (skupina CD) i 6 zdravih pasa koji su bili kontrolna skupina. U obje su skupine uzeti uzorci krvi za analizu antioksidacijskih i oksidacijskih pokazatelja. Osim TDH pokazatelja (razine nativnog tiola [NT], ukupnog tiola [TT] i disulfida [Ds] te omjeri Ds/NT, Ds/TT i NT/TT), u krvnom serumu obiju skupina određeni su i IMA te albumin (ALB). Razine IMA-e u CD skupini bile su znakovito veće nego u kontrolnoj skupini (P < 0,05). Antioksidacijski pokazatelji (NT, TT) i oksidacijski pokazatelji (Ds, Ds/NT i Ds/TT) pokazali su međusobnu znakovitu pozitivnu korelaciju (P < 0,01). Područja ispod ROC krivulje IMA-e, Ds/NT i Ds/TT bila su 0,78, 0,62 i 0,62. Najviše razine IMA-e, Ds, Ds/NT i Ds/TT te niske razine NT-a, TT-a, NT/TT-a i ALB-a u pasa sa štenećakom mogu se upotrijebiti u procjeni oksidacijskog stresa uzrokovanog tom bolešću. Ukupno gledano, dijagnostička svojstva IMA-e, Ds/NT, i Ds/TT za otkrivanje povećanog oksidacijskog stresa bila su slična, s tim da je najprikladniji bio IMA
Tapered nanoscale chalcogenide fibers directly drawn from bulk glasses as optical couplers for high-index resonators
We report production of air-clad tapered chalcogenide fibers by directly drawing bulk glasses between cleaved tips of tapered silica fibers. Exploiting these tapered fibers with nanoscale waists as evanescent optical couplers, we demonstrate phase-matched coupling of light into on-chip whispering gallery mode chalcogenide microresonators with coupling efficiencies as high as 95%. To the best of our knowledge, this is the first-time demonstration of critical coupling into high-index microresonators by using high-index tapered fibers. The tapered chalcogenide fibers can also be utilized as optical couplers for microresonators made of various high-index materials, as well as for nonlinear optical applications. © 2017 Optical Society of America
Analysis of technical, economic and environmental aspects of photovoltaic designs: A case study on tekirdag viticulture research institute grape juice processing building roof
Renewable energy sources should be expanded instead of fossil energy sources due to their environmental damage and exhaustion property. Especially, unused roof areas in agricultural production plants are good options for electricity generation using PV panels. In this research; theoretical, practical and technical solar energy potentials were determined; the amount of electricity that can be produced and carbon emission amounts that can be reduced by PV panels were found using PVsyst and RETScreen software in 6 different designs for the roof area of Grape Products Processing Plant in Tekirdag Viticulture Research Institute. The average consumed energy during grape juice production period was determined as 4059,822 kWh. As a result of this research, the technical solar energy potential was found as 1543 kWh/m2 annually with acceptance of panel angle as 20? and the azimuth angle as 0?. Performance ratios for monocrystalline (mono-si), polycrystalline (poly-si) and amorfcrystalline (a-si) PV system designs were calculated as 85,15%-84,39%-80,40% while annual electricity generation values were calculated as 1219-1280-1291 kWh/kWp/year, respectively. It was seen that greenhouse gas reductions can be achieved as 10.9 tCO2/year in case of generation of 23.1 MWh electricity per year (mono-si); 10.5 tCO2 /year in case of 22.4 MWh electricity generation (poly-si) and 4.9 tCO2 /year in case of 10.3 MWh electricity generation (a-si). It was found that designs using a-si panel type are not suitable due to the limited roof area of the plant while designs using mono-si and poly-si panels provide approximate outputs in terms of cost and efficiency. © 2020, TUBITAK. All rights reserved
Neobisium yozgati n. sp., and N. anaisae n. sp. (Neobisiidae, Pseudoscorpiones), from Turkey and Macedonia (FYROM), respectively
Two new species of endemic and relict cave-dwellers of genus Neobisium Chamberlin, have been described from Turkey and Macedonia (FYROM), respectively. From its phenetically close congener, N. granulatum Beier, N. yozgati n. sp. (from Yozgat, Turkey) is distinguished in many important respects. In addition, N. anaisae n. sp. (from a cave in Krapa, FYROM) differs from its closest forms (N. korabense Ćurčić, N. ohridanum Hadži, and N. vladimirpantici Ćurčić) by many morphological characters and form of different body parts. Both species are illustrated, diagnosed, and thoroughly described. They both represent endemic and relict forms
Bitmiş Li-iyon ikincil pillerinden lityum ve kobalt geri kazanımı
In recent years, consumer demand for smaller and more powerful electronic devices has led to a large increase in the usage of batteries worldwide. Advances in sophisticated electronic items such as laptop computers and mobile phones require these batteries to be more sustainable, smaller and lightweight. The gravimetric energy density is 110-160 and 30-50 Wh/kg for lithium ion and lead acid batteries respectively. Owing to its merit, such as a high energy density, a high working voltage, a long cyclic life and negligible memory loss effects, the lithium ion batteries are state of the art and also remain the battery system with the highest potential for future development. With increasing use of such batteries in the developed countries for transportable applications, and large untapped markets in the developing countries, the need for lithium ion batteries will increase by orders of magnitude. This has led to growing concerns worldwide about the disposal of batteries and the potentially harmful impact they may have on the environment. However, spent batteries also represent a concentrated source of high value metal. Therefore, it is important that a system for recycling and regenerating waste lithium ion batteries is developed. Owing to the explosive nature of metallic lithium, spent lithium primary batteries cannot be disposed safely unless metallic lithium is properly removed from them. In contrast, lithium ion secondary batteries use a lithium conducting cathode made from a non-explosive 'mixed oxide', allowing a wider selection of recycling techniques. These mixed oxides often contain valuable cobalt, which has a high economic value for recycling owing to the fact that natural sources for cobalt are limited, and its uses are diverse and steadily increasing. The objective of the present work is to outline the dissolution characteristics of the cathodic active materials from spent lithium ion secondary batteries in sulfuric acid media, and to recover cobalt and lithium separately as their sulfates by sulfate precipitation method using ethanol. Despite long leaching time and high leaching temperature, it was observed that cobalt, which is present in the LiCoO2 compound, dissolved into concentric sulfuric acid media with poor dissolution efficiency. The reason for this is that the oxidation level of the cobalt in the LiCoO2 compound is +3, so it should be reduced to +2. Hydrogen peroxide, known as both good oxidizer and reducer, is an ideal option for this reduction. Using 5% H2O2, at 80oC, at 300 rpm, the LiCoO2 compound was found to dissolve into 4M H2SO4 in an hour with 100% dissolution efficiency. Cobalt was recovered in two steps. During the first step, 92% of the cobalt is recovered as CoSO4 by the use of ethanol at a volume ratio of 3:1. Ethanol removes water ligands from the Co2+ cation, and caused the precipitation of cobalt as cobalt sulfate monohydrate. In the second step, the remaining cobalt was precipitated as cobalt hydroxide (Co(OH)2) by increasing the pH value up to 10 with the addition of lithium hydroxide (LiOH). Lithium, which remained in the solution, was then recovered as lithium sulfate (Li2SO4) with up to 98% recovery efficiency by the addition of ethanol at a 3:1 volume ratio. It was shown that metals could be precipitated separately by this technique depending on their concentrations present in the solution. Using this selective precipitating characteristic of ethanol, it was managed to precipitate the cobalt with high efficiency without promoting the precipitation of the lithium. The advantage of this technique over more classical techniques for salt crystallization is that no temperature shift is needed, and the product will be intrinsically low in water, unlike the more classical separation by crystallization, which requires heat (or at least temperature control) and tends to yield a metal sulfate with a high amount of crystalline water. The leach acids may be reused in feedback loops. Also, it is possible to recover ethanol by distillation. By doing so, the recovered ethanol could be reused for precipitating sulfates from sulfuric acid solutions. The proposed process can be used to treat spent Li-ion secondary batteries, and to recover valuable cobalt and lithium without posing environmental problem. Keywords: Li-ion batteries, recycling, precipitation method with ethanol, Li and Co recovery. Bu çalışmada, lityum iyon ikincil pillerinde katodik aktif malzeme görevi gören lityum kobalt oksit (LiCoO2) bileşiğinin sülfürik asit ile liç davranışları optimize edilerek, çözeltiye geçen lityum ve kobaltın etanol sülfat çöktürme tekniği ile sülfatları şeklinde çöktürülme şartları incelenmiştir. Yeniden kullanılabilir malzemeleri maksimum seviyede geri kazanmak ve böylece bitmiş pillerin çevreye yapacağı kirliliği minimuma indirmek amaçlanmıştır. 80oC sıcaklıkta 1 saat boyunca çözümlendirme işlemi için kullanılan %5 hidrojen peroksit içeren 4M sülfürik asit çözeltisi ile lityum ve kobaltın tamamı çözeltiye geçmiştir. Çözeltiye geçen kobalt iki aşamada geri kazanılmıştır. Birinci adımda, çözeltideki kobalt iyonları, 3:1 etanol/çözelti hacimsel oranında etanol ilavesiyle CoSO4 şeklinde %92 verim ile çöktürülmüştür. Etanol, çözeltideki sülfat ligant bağlarının kırılmasını sağlayarak kobaltın, kobalt sülfat tuzu (CoSO4) şeklinde çökmesini sağlamıştır. İkinci adımda, etanol ile çökmeyen kobalt iyonları, lityum hidroksit ile pH 10’a getirilerek kobalt hidroksit (Co(OH)2) şeklinde çöktürülmüştür. Çözeltideki lityum iyonları da sülfürik asit ile asitlendirildikten sonra 3:1 etanol/çözelti hacimsel oranında etanol ilavesiyle %98 verim ile lityum sülfat (Li2SO4) şeklinde çöktürülmüştür. Etanol sülfat çöktürme tekniği ile metallerin başlangıç konsantrasyonlarına bağlı olarak selektif olarak çöktürüldükleri gösterilmiştir. Ayrıca diğer metotların aksine etanol sülfat çöktürme metodu ile yapılan çöktürme işleminde sıcaklık değişimine ihtiyaç yoktur ve elde edilen ürün düşük miktarda kristal su içermektedir. Anahtar Kelimeler: Li-iyon pilleri, geri dönüşüm, etanol sülfat çöktürme, Li ve Co kazanımı. 
Collective Excitations of (154)Sm nucleus at FEL{gamma}+LHC Collider
The production of collective excitations of the (154)Sm at FEL{gamma}+LHC
collider is investigated. We show that this machine will be a powerful tool for
investigation of high energy level excitations.Comment: 6 pages, 1 figure, 4 table
The effect of sulforaphane on oxidative stress and inflammation in rats with toxic hepatitis induced by acetaminophene
OBJECTIVE: The aim of the present study was to reveal the possible effect of sulforaphane on oxidative stress and inflammation in rats liver with toxic hepatitis induced by acetaminophene.
BACKGROUND: Sulforaphane is a compound with high antioxidant properties. Acetaminophen, which is a para-aminophenol derivative, can lead to fatal hepatic necrosis with direct hepatotoxic effects at high doses.
METHODS: Thirty six male Sprague-Dawley rats were randomly divided into four groups. Control group (n = 9) was fed with standard rat chow and water for 3 days. Group APAP (n = 9) received a single dose acetaminophen 1 g/kg by oral gavage in addition to standard chow and water. Group SFN (n = 9) received sulforaphane 500 mu g/kg by oral gavage in addition to standard chow and water for 3 days. Group APAP+SFN (n = 9) received sulforaphane 500 mu g/kg and a single dose acetaminophen 1 g/kg by oral gavage in addition to standard chow and water. Acetaminophen was administered three hours after SFN administration.
RESULTS: Neopterin, MDA, AST, ALT and CRP levels of group APAP were significantly increased compared to control group. GSH level of group APAP was significantly lower than in the control group.
CONCLUSION: Sulforaphane is a protective agent against acetaminophen-induced liver damage and it can be added in the treatment protocol (Tab. 1, Fig. 5, Ref. 51). Text in PDF www.elis.sk
Polynomial Solution of Non-Central Potentials
We show that the exact energy eigenvalues and eigenfunctions of the
Schrodinger equation for charged particles moving in certain class of
non-central potentials can be easily calculated analytically in a simple and
elegant manner by using Nikiforov and Uvarov (NU) method. We discuss the
generalized Coulomb and harmonic oscillator systems. We study the Hartmann
Coulomb and the ring-shaped and compound Coulomb plus Aharanov-Bohm potentials
as special cases. The results are in exact agreement with other methods.Comment: 18 page
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