Chromium speciation using an aminated amberlite XAD-4 resin column combined with microsample injection-flame atomic absorption spectrometry

Amberlite XAD-4 resin (AXAD-4) was chemically modified to an aminated Amberlite XAD-4 (AAXAD-4) resin and characterized by infrared spectroscopy. AAXAD-4 resin was used as an efficient solid phase for the preconcentration and speciation of Cr(III) and Cr(VI) ions by column technique. The concentration of chromium species was determined by microsample injection system-flame atomic absorption spectrometer (MIS-FAAS). Selective retention of Cr(III) ions was achieved at pH 8.0 and eluted using 1.0 mL of 3.0 mol L–1 HCl and 1.0 mL of 2.0 mol L–1 NaOH, successively, at the flow rate of 5.0 mL min–1. The maximal sorption capacity of AAXAD-4 resin for Cr(III) ions was found to be 67.0 mg g–1. The limit of detection (LOD) and limit of quantitation (LOQ) for Cr(III) ions were found to be 0.041 and 0.131 µg L–1, respectively, with preconcentration factor (PF) of 375 and relative standard deviation (RSD) of 3.75% (n = 11). The method was validated using certified reference materials (CRMs) and successfully applied to the real samples, spiked with Cr(III) and Cr(VI) ions. © 2018 Slovensko Kemijsko Drustvo. All rights reserved

The engineering performance of eco-friendly concretes containing diatomite fly ash and ground granulated blast furnace slag

Approximately 10 % of CO2 is emitted from an ordinary Portland cement production. In cement and concrete production, CO2 emissions can be greatly reduced by using Supplementary Cementitious Materials (SCMs). In addition, the microstructure and durability properties of concrete are greatly improved when silica-rich SCMs are used. In this study, Eco-Friendly concrete design was carried out using three different SCMs. Diatomite, ground granulated blast furnace (GGBFS) and fly ash (FA) were used as the SCM in the concrete mixtures. SCMs were used instead of cement at ratios of 5, 10, 15, and 20 wt %. When diatomite was used at the rate of 20 %, the standard consistency water increased 1.7 times as compared to the reference mixture. With the increase in the replacement ratio, the final setting times of the pastes increased. The high active SiO2 content of diatomite shortened the initial setting time and increased the compressive strength. The use of 5 % diatomite reduced the slump value by 57 % as compared to the reference mixture. The slump and Ve-Be tests of GGBFS and FA mixtures showed similar properties to the reference mixture. The 28-day compressive strength of concrete varied between 29.2–34.6 MPa. With the increase in the curing time of the concrete mixtures, up to 50 % improvements were observed in the compressive strength. Especially on the 180th day, a compressive strength of 44.1 MPa was obtained in concrete mixtures with a 10 % replacement ratio. While using the FA in the mixtures improved the abrasion properties, the opposite result was observed in the case of the GGBFS. It was observed that the mixtures with 5 % FA showed the closest properties to the reference mixture. As a result, it was determined that SCMs with different properties could be used in environmentally friendly concrete mixtures by up to a 20 % replacement ratio

Optik atrofi, maküler incelme ve arkuat skotom gibi atipik klinik bulgular gösteren çoklu geçici beyaz nokta sendromu olgusu

A 57-year-old man presented with a sudden loss of vision, central scotoma, and photopsia in the left eye. Grayish-white spots localized in the deep retina around the macula and optic disc were observed in the left eye on funduscopic examination. We observed a hyperfluorescence in a wreath-like pattern with late staining in retinal lesions during the early stage of fundus fluorescein angiography. Disruption was observed in an ellipsoid zone in optical coherence tomography. Multiple evanescent white dot syndrome was diagnosed based on findings and followed up without medication. The visual acuity of the left eye improved from 1/20 to 6/10 after a 7-week follow-up. Dilated fundus examination showed optic atrophy, and visual field examination revealed an arcuate scotoma.Elli yedi yaşında erkek hasta, sol gözde ani görme kaybı, santral skotom ve fotopsi şikâyetleri ile kliniğimize başvurdu. Funduskopik muayenesinde, sol gözde makula ve optik disk etrafında, retinanın derin katlarında lokalize olmuş grimsi beyaz lezyonlar gözlendi. Fundus floresan anjiyografi erken dönemi boyunca retinal lezyonlarda gözlenen çelenk benzeri hiperfloresans, geç boyanma ile devam etti. Optik koherens tomografide, fotoreseptör iç ve dış segment tabakasında harabiyet görüldü. Mevcut bulgular eşliğinde hastaya, çoklu geçici beyaz nokta sendromu teşhisi kondu ve ilaçsız takip edildi. Yedi haftalık takip sonrası hastanın görme keskinliği 1/20’den 6/10’a yükseldi. Dilate fundus muayenesinde, optik atrofi ve görme alanında arkuat skotom oluştuğu gözlendi

Lise Öğrencilerinin Umut Düzeylerinin Yordanması: Akademik Öz- Yeterlik ve Problem Çözmenin Rolü

The current study presented how well academic self-efficacy, problem solving, gender, and age predict dispositional and state hope levels of high school students in Turkey. The participants were consisted of 392 high school students. Of the participants, 230 (58.7%) were girls and 162 (41.3%) were boys. Questionnaire measures of dispositional and state hope, academic self-efficacy, and problem solving were administered to the participants. Two multiple linear regression analyses were performed to examine to what extent the independent variables predict dispositional and state hope levels of participants. The results indicated that the predictors significantly accounted for 22% of the variance of dispositional hope, 25% of the variance of state hope. In both multiple linear regression models, academic self-efficacy and problem solving were significant predictors of students’ dispositional and state hope scores. Higher hope scores were significantly associated with higher academic self-efficacy beliefs and better problem solving skills. The findings were discussed in the light of the literature with some implications for school counselors and educators.Bu çalışmada, akademik öz-yeterlik, problem çözme, cinsiyet ve yaş değişkenlerinin lise öğrencilerinin sürekli ve durumluk umut düzeylerini ne derece yordadığı incelenmiştir. Araştırmanın katılımcıları 392 lise öğrencisinden oluşmaktadır. Katılımcıların 230’u (%58.7) kız, 162’si (%41.3) erkektir. Katılımcılara sürekli umut, durumluk umut, akademik öz-yeterlik ve problem çözme değişkenlerine ilişkin ölçme araçları uygulanmıştır. Yordayıcı değişkenlerin, katılımcıların sürekli ve durumluk umut düzeylerini ne derece yordadığını belirlemek için iki tane çoklu doğrusal regresyon analizi yapılmıştır. Elde edilen bulgulara göre, yordayıcı değişkenler sürekli umut değişkenine ait varyansın %22’sini açıklarken, durumluk umut değişkenine ait varyansın ise %25’ini manidar bir şekilde açıklamıştır. Her iki çoklu doğrusal regresyon modelinde, akademik öz-yeterlik ve problem çözme yordayıcı değişkenleri lise öğrencilerinin sürekli ve durumluk umut düzeylerinin manidar yordayıcılarıdır. Umut düzeyleri yüksek olan öğrencilerin akademik öz-yeterlik inanç düzeyleri ve problem çözme beceri düzeyleri daha yüksektir. Araştırma bulguları alan yazın kapsamında ele alınmış ve okul psikolojik danışmanları ve eğitimcilere yönelik doğurguları tartışılmıştır

Influence of Preoperative Pain Duration on Microsurgical Varicocelectomy Outcomes

Objective. To investigate the question of whether duration of pain before surgery ultimately affects sperm parameters after varicocelectomy. Methods. Fifty patients with painful grade-3 varicocele were investigated prospectively. The patients were divided into two groups according to their symptom period. The patients having had grade-3 varicocele for less than 1 year were included in Group-1 (Ge, n=25). Twenty-five patients who had painful grade-3 varicocele for more than 1 year (Gs, n=25) were classified in Group-2. Semen analysis was performed after 3 days of sexual abstinence twice a month. Total sperm concentration (TSC), rapidly progressive motility (SPa), and slow or sluggish motility (SPb) rates were noted. Pain was evaluated by using 10 cm visual analogue scale (VAS). Results. Postoperative TSC and %SPb were significantly higher in both groups (P=0.01). There was no difference between two groups for preoperative and postoperative TSC, %SPa, % and SPb values. VAS significantly declined in both groups (P=0.005). This postoperative decline was not significant for intergroup comparison. Conclusions. Our results show that increase in semen quality and decrease in the pain after microsurgery varicocelectomy do not depend on the duration of the preoperative pain

Larinks skuamöz hücreli karsinom kökenli optik disk ve koroid metastazlı bir olgu

A 67-year-old male patient was presented with loss of vision, which he noticed in his left eye one week ago. He had undergone total laryngectomy due to laryngeal squamous cell carcinoma 3 years ago. His fundus examination revealed an elevated yellow mass on the optic disc. Magnetic resonance imaging (MRI) and computed tomography (CT) were performed with suspicion of laryngeal cancer metastasis. The MRI showed metastatic lesions in the brain, optic disc, and the surrounding choroid. The CT demonstrated diffuse metastasis in both lungs. The patient received radiotherapy for the brain, optic disc, and choroidal metastases. Unfortunately, the patient died within 2.5 months after the diagnosis because of systemic complications that developed due to extraocular causes. Metastasis of laryngeal cancer to the optic disc and choroid is rare. Although the majority of optic disc tumors are primary, a systemic investigation should be performed in cases of a mass on the disc with the suspicion of distant organ metastasis, albeit rare.T Altmış yedi yaşında erkek hasta, 1 hafta önce sol gözünde fark ettiği görme kaybı şikâyeti ile başvurdu. Üç yıl önce laringeal skuamöz hücreli karsinom nedeniyle total larenjektomi geçirdiği öğrenildi. Fundus muayenesinde, optik diskte sarı bir kitle görüldü. Larinks kanseri metastazı şüphesi ile manyetik rezonans görüntüleme (MRG) ve bilgisayarlı tomografi (BT) yapıldı. MRG’de beyin, optik disk ve çevreleyen koroidde, metastatik lezyonlar tespit edildi. BT’de her iki akciğerde yaygın metastaz saptandı. Hasta beyin, optik disk ve koroid metastazları için radyoterapi aldı. Ekstraoküler nedenlere bağlı gelişen sistemik komplikasyonlar nedeniyle tanı konulduktan sonraki 2,5 ay içinde ne yazık ki hasta kaybedildi. Larinks kanserinin, optik disk ve koroide metastazı nadirdir. Optik disk tümörlerinin çoğunluğu primer olmakla birlikte, nadir de olsa uzak organ metastazı şüphesi ile diskte kitle olması durumunda sistemik inceleme yapılmalıdır

İlköğretim okullarında etkin yöneticiler için bir gösterge: problem çözme becerisi

Bu araştırmada, ilköğretim okulu yöneticilerinin problem çözme beceri düzeyleri incelenmiş onların günlük hayatta karşılaşabilecekleri problemlere genel olarak nasıl tepki gösterdikleri belirlenmeye çalışılmıştır. Araştırma sonucunda, ilköğretim okulu yöneticilerinin problem çözme konusunda kendilerini yetersiz olarak algıladıkları görülmüştür

Determination of antioxidant capacity of capsule loaded textiles

In this study, microcapsules containing α-Tocopherol (α-TP) have been prepared by complex coacervation technique and applied to cotton fabric by padding method. Characterization of the capsules is determined by scanning electron microscopy, thermogravimetric analysis, fourier transform infrared spectroscopy and particle size measurement. Yield of microencapsulation process is found in the range of 41.63 - 62.20%. Antioxidant capacity of capsule loaded textiles has been examined according to DPPH free radical scavenging method, and α-TP existence in ethyl cellulose capsules is found as 65.218 - 330.722 µM. α-TP activity in capsule treated fabric is determined as 61.73 µg. Presence of the capsules on fabric and also α-TP activity has been found to remain effective even after twenty washes at 40°C

Healing effects of single-dose triptolide in rats with severe acute pancreatitis

Aim: Severe acute pancreatitis (SAP) carries high morbidity and mortality risk. If theproinflammatory response phase of SAP cannot be controlled, it may result in multiorganfailure (MOF). Nuclear factor-kappa B (NF-?B) activation plays an important role in thedevelopment of MOF. In this study, it was aimed to investigate the healing effects of triptolide,an anti-inflammatory and immunosuppressive agent in rats with SAP.Material and Methods: A total of 20 Wistar-Albino rats were divided into two groups as theSAP and triptolide treatment (TT) groups. SAP was induced by intraperitoneal injection ofcerulean (50 mg/kg) in both groups. TT group was administered a single dose (0.2 mg/kg)triptolide 24 hour after the induction of SAP. Serum ALT, AST, GGT, Lipase, Glucose, ALPand amylase levels and pancreatic tissue samples were examined.Results: Serum glucose and amylase levels were found to be significantly lower in the TTgroup (p=0.011 and p=0.035, respectively). There was no significant difference between thegroups in terms of other biochemical parameters. Pancreatic edema, acinar cell degeneration,fat necrosis, intrapancreatic&perivascular inflammation, inflammation in the peripancreatic fattissue were common histopathological findings in both groups. There was no significantdifference between the groups in terms of histopathologic changes.Conclusion: Cerulein-induced pancreatitis is a successful method for experimental SAP. Thehealing effects of single-dose triptolide treatment are not evident in the early phase of SAP.The therapeutic effects of triptolide on inflammatory and oxidative stress were not significantlyapproved by histopathological and biochemical parameters by the pancreatic tissue

PIGMENT PRINTING OF COTTON FABRICS WITH CYCLODEXTRIN AND BIFUNCTIONAL REACTIVE DYE

Beta-cyclodextrin, which has seven glucopyranose units, have ability to make inclusion complexes with the appropriate molecules that are called guest molecules. The inclusion complex occurs in the apolar cavity of beta-cyclodextrin therefore guest molecules should have the appropriate apolar groups and molecular size. Cyclodextrins can change the some properties of guest molecules, such as solubility, thermal behavior etc. Beta-cyclodextrin, has been preferred to use in various textile applications, such as insecticide, cosmetics, pharmaceutical agents, antibacterial agents, odour applications, and in dyeing as an auxiliary agent. However, a few studies are done using cyclodextrins in printing. Printing of pigment dyes with reactive printing paste using beta-cyclodextrin was investigated in this work. By this purpose, in the first step inclusion complexes were obtained by kneading method at various weight ratios of beta-cyclodextrin and pigments. Inclusion complexes were printed on cotton fabric by flat screen printing with using alginate based reactive printing paste. In the second step, pigments were printed by pigment printing paste with and without of cyclodextrin Reactive dye also was printed with and without cyclodextrin. Colorimetric values, colour strength fastness properties and stiffness peculiarities were investigated. The optimum complex forming weight ratio was found 1:2 for red, blue and mixture of pigments, and 1:3 for yellow pigment from colorimetric and colour strength values. Crocking fastness were improved by addition of inclusion complexes