Fast production of high entropy alloys (CoCrFeNiAlxTiy) by electric current activated sintering system

Electric current assisted sintering (ECAS) can be a new production method for high entropy alloy production due to its advantages such as low sintering temperature and short holding time. In this study, production of CoCrFeNiAlxTiy alloys (x:0.5, y:0,05, 1; y:0.5, x:0, 1) was carried out in electric current activated/assisted sintering system in open air with a uniaxial contact pressure of 35 MPa at 2500 A for 5 min. Microstructural and micro hardness properties of samples are determined. After sintering, depending on the composition, solid solution phases such as FCC (FeNi), BCC (FeCr) were formed in all alloys. In alloys other than CoCrFeNiAl0.5, sigma and intermetallic phases are formed. According to SEM-EDS analyses, the elements with high negative mixing enthalpy are gathered together and the dark phases are enriched from the Al-Ni-Ti while the Fe-Cr is precipitated due to its high concentration around this phase. Thanks to intermetallic phases formed by the lattice distortion of Al and Ti elements with high atomic radius, the hardness was obtained as 401 H V in CoCrFeNiAl0.5 alloy and 700 H V in CoCrFeNiAl0.5Ti0.5 alloy. Alloys were subjected to homogenization heat treatment at 1200 degrees C for 18 h after sintering. As a result of homogenization, the increase in the formation of sigma phase is generally multiplied. While the microstructure distribution became more homogeneous by annealing, an increase in the lattice parameters of the phases was generally observed. Hardness values increased up to 496 H V in the CoCrFeNiAl0.5 alloy and 956 H V in the CoCrFeNiAl(0.5)Tio(0.5) alloy due to the increase in distortion and high hardness sigma phase due to the increase of the lattice parameters

High temperature oxidation behavior of low temperature aluminized Mirrax (R) ESR steel

The aim of this study was to investigate the effect of aluminizing process on the oxidation resistance of mirrax steel. The oxidation behavior of pack cemented aluminizing coatings on Mirrax ESR Steel was investigated at 1000 degrees C for 5, 25 and 70 h. Low temperature aluminizing process was carried out at 700 degrees C for 2, 4 and 6 h by pack cementation method. The microstructures, surface morphologies and phase distribution of both coatings before and after oxidation were investigated using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and x-ray diffractometry (XRD). Analysis of the coating layer showed that the coating was homogeneous, non-porous and had a good bond at the interface of the coating-matrix. Coating layer was mainly composed of aluminum-rich Fe2Al5 phase. Depending on the increased process time, the coating thickness varied approximately from 17 to 58 microns. The aluminizing process could greatly improve the oxidation resistance of the substrate. Al diffused outward to form multi-layer oxide films, which prevented the diffusion of oxygen. A sticky, protective, non porous alumina film layer was obtained successfully. The results show that oxidation resistance increased with the increased aluminizing time

Fatty Acid Composition of the Aerial Parts of Some Centaurea Species in Elazig, Turkey

WOS: 000339624700019Purpose: To evaluate the fatty acid composition of six Centaurea species, viz, Centaurea behen, C. saligna, C. depressa, C. urvillei subsp. urvillei, C. urvillei subsp. hayekiana and C. aggregata subsp. aggregata, from Elazig, Turkey. Methods: Fatty acid methyl esters (FAMEs) of the oil extracts of four Centaurea species were prepared. The fatty acid compositions of Centaurea species were analyzed by gas chromatography (GC). Results: Saturated fatty acids (SFAs) in Centaurea species and subspecies ranged from 24.61 - 50.92% of their total fatty acid content, while monounsaturated fatty acids (MUFAs) were in the range of 3.40 - 37.96% and polyunsaturated fatty acids (PUFAs) 12.21 - 20.57%. Palmitic acid C 16: 0, oleic acid C 18:1 omega 9 and linoleic acid C 18:1 omega 3 were the major fatty acids in all the species. Oleic acid was the main constituent of C. urvillei subps. urvillei and C. agrregata subsp. aggregata with a content of 26.92 and 50.92%, respectively. Conclusion: The oil extracted from Centaurea species is a good source of essential fatty acids.Ege University Faculty of Pharmacy Pharmaceutical Sciences Research Centre (FABAL, Izmir, Turkey)Ege University; Ege University Research Fund, Izmir, TurkeyEge University [13/ECZ/031]The authors would like to thank the authorities of Ege University Faculty of Pharmacy Pharmaceutical Sciences Research Centre (FABAL, Izmir, Turkey) and Ege University Research Fund, Izmir, Turkey (grant no. 13/ECZ/031) for support for this work

A Comparative Assessment of alpha-Tocopherol Content and Antioxidant Activity of Some Fresh and Commercial Fruit Juices

WOS: 000338275000015Aim: Fruits and vegetables are the main sources of antioxidant compounds and vitamins. In nature, alpha-tocopherol, is the most abundant and biologically active form of Vitamin E. The current study was aimed to investigate the antioxidant activity and alpha-tocopherol content of commercial and freshly squeezed fruit juices. Material and Methods: Apple, apricot and tomatoes fresh and commercial fruit juices were evaluated for their potential antioxidant activities using DPPH and ABTS(+) radical scavenging capacity assays. The total phenolic and flavonoid content of juices were determined by Folin-Ciocalteu and Aluminium chloride colorimetric methods respectively. The alpha-tocopherol contents of juices were investigated by HPLC-UV chromatographic method. Results: The highest alpha-tocopherol concentration was found in freshly squeezed tomatoes juice (0.0761+0.20mg/100g) the total phenolic content of freshly squeezed fruit juices measured by Folin-Ciocalteu assay, ranged between 2.10-12.83mg gallic acid equivalents (mg GAE/100ml). The total flavonoid content of samples was expressed as quercetin equivalents (mg QE/100ml). The commercial tomatoes juice showed higher content of flavonoid (4.10 +/- 0.0126 mg QE/100ml), followed by freshly squeezed apple and apricot fruit juices. The fresh fruit juices of tomatoes showed the lowest content of flavonoid and highest content of total phenolic compounds. Freshly squeezed apple juice and apricot juice were found to exert higher antioxidant activities in ABTS(+) and DPPH assays respectively. Conclusion: It was observed that alpha-tocopherol content and antioxidant capacities and total phenolic and flavonoid concentrations of freshly squeezed juices were higher than commercial ones

Evaluation of the eating habits of breast cancer patients

WOS: 000580048400023PubMed: 33235575Objective: To determine the relationship between the dietary characteristics of breast cancer patients. Methods: Patients with breast cancer whose treatments have finished and are in remission formed the study group and healthy people formed the control group. Demographic, anthropometric characteristics, food consumption frequency form and exercise status were recorded with all groups. Data analysis was done by SPSS 22. Results: in the study group, mean carbohydrate percentage was lower, while fat, fat percentage, monosaccharide, glucose, fructose, omega3( n3), saturated fatty acids(SFA), monounsaturated fatty acids (MUFA), vitamin A, C, E, B6, biotin and copper values were significantly higher (p<0.05). Recurrence was observed in seven patients (7.1%) during the follow-up period, hormone receptor levels (ER) and vitamin B2 intake (accuracy 93.9%) were inversely related to the recurrence of the disease (p=0.02). Conclusions: While the percentage of carbohydrate taken was lower in study group; total fat, n3, SFA, MUFA, monosaccharide, glucose, fructose, water-soluble fiber, B6, biotin and copper values were higher. Further studies are needed for vitamin B2 deficiency in patients with recurrence

Infecção pelo vírus Epstein-Barr tem influência sobre o desenvolvimento do carcinoma de laringe? Detecção de EBV pelo Real-Time Polymerase Chain Reaction em tecidos tumorais de pacientes com carcinoma de laringe

O vírus Epstein-Barr (EBV) é um conhecido vírus carcinogênico. A associação entre EBV e alguns tumores sugere que também pode haver correlação entre carcinoma de laringe e EBV. OBJETIVO: O presente estudo pretende determinar o papel do EBV na etiologia do carcinoma de laringe. MÉTODO: Estudo prospectivo sobre EBV por reação em cadeia da polimerase em tempo real em tecidos tumorais de 25 pacientes com carcinoma de laringe e 17 pacientes com lesões benignas de laringe; análise da relação entre presença de DNA viral e tabagismo, etilismo, localização e diferenciação tumoral. RESULTADOS: Não houve diferenças significativas entre os grupos de controle e de estudo para positividade da PCR para EBV (p > 0,05). Não foi identificada relação estatisticamente significativa entre positividade para EBV e diferenciação tumoral, localização da neoplasia, tabagismo ou etilismo (p > 0,05). CONCLUSÃO: Nossos resultados sugerem que, a despeito de sua identificação em alguns carcinomas espinocelulares de laringe, a presença de EBV não teve qualquer influência na patogenia do carcinoma de laringe