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  Postdischarge radiation exposure from I-131 treated thyroid cancer patients: Implications for dental practice

  (Elsevier, 2026)

  Akdoğan, Emine Tuna

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  Pınarbaşı, Enes Malik

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  Coşkun, Sinem

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  Yeyin, Nami

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  ALMisned, Ghada

  Daha fazla

  Objectives. This study evaluated, for the first time, the radiation exposure of dentists examining thyroid cancer patients following radioactive iodine (RAI) therapy. Study Design. External dose-rate measurements were performed at distances of 5 100 cm in 93 differentiated thyroid carcinoma(DTC) patients between Days 1 and 7 after discharge. Patients were classified according to administered RAI activity as Group I (1110 2775MBq,n=31)and Group II (3700 7400MBq,n=62). Measurements were obtained in the anterior oblique position with patients seated upright to simulate dental examination conditions. Results. In Group I, the cumulative radiation dose potentially received by a dentist was 461.75 mSv on Day 1 after discharge, decreasing to 112 mSv and 92 mSv on Days 2 and 3, respectively. In Group II, cumulative doses on Days 1 4 after discharge were 1148 mSv, 447 mSv, 73 mSv, and 37 mSv, respectively. Conclusions. The findings indicate that patients receiving <3700 MBq RAI may safely undergo dental examination approximately 24 26 hours after discharge with appropriate radiation protection precautions, whereas dental treatment in patients receiving 3700 MBq RAI should preferably be postponed for at least 48 hours to maintain occupational exposure below the 1 mSv public dose limit.

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  Exploring the associations between food insecurity, eco-anxiety, sustainable and healthy eating behaviors, and life satisfaction among nutrition and dietetics students in Türkiye

  (Wiley, 2026)

  Arslan, Sedat

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  Ayyıldız, Feride

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  Bayram, Hatice Merve

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  Aydın, Ayçin

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  Yurtdaş Depboylu, Gamze

  Daha fazla

  BACKGROUND Food insecurity may intersect with sustainable eating, eco-anxiety, and subjective well-being, but evidence among dietitians is limited. This cross-sectional study examined these associations among 2027 nutrition and dietetics students recruited through multicenter departmental networks in Türkiye. Participants completed the Sustainable and Healthy Eating Behaviors Scale, Adult Food Security Survey Module, Ecological Anxiety Scale, and Contentment with Life Assessment Scale. Group comparisons, Spearman correlations, and sequential multivariable linear regression were used. RESULTS Overall, 1381 students (68.1%) were food secure and 646 (31.9%) were food insecure. Compared with food-secure students, food-insecure students had lower sustainable and healthy eating behavior scores [3.93 (3.11–4.53) vs. 4.09 (3.48–4.74); |rrb| = 0.132], higher ecological anxiety [16.50 (13.00–22.00) vs. 13.00 (8.00–17.00); |rrb| = 0.321], and lower life contentment [19.00 (16.00–22.00) vs. 22.00 (19.00–26.00); |rrb| = 0.422] (all P < 0.001). In fully adjusted models, higher food insecurity scores were associated with lower sustainable and healthy eating scores (beta = −0.073, P = 0.002), higher ecological anxiety (beta = 0.279, P < 0.001), and lower life contentment (beta = −0.305, P < 0.001); adjusted R-squared values were 0.040, 0.093, and 0.128, respectively. CONCLUSION Food insecurity was associated with less favorable sustainable and healthy eating behaviors, greater eco-anxiety, and lower life contentment among nutrition and dietetics students. Effect sizes ranged from small to moderate, and the cross-sectional design does not permit causal inference.

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  Psychometric validation of the Short Dark Tetrad (SD4): An item-level re-examination with measurement invariance

  (Springer Nature, 2026)

  Türk, Burcu

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  Karaburun, Merve

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  Şenyuva, Gülçin

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  Hamzaoğlu, Nurcan

  Daha fazla

  Psychometric evaluations of the Short Dark Tetrad (SD4; [33]) have been conducted predominantly in Western samples, and the limited evidence from non-WEIRD contexts has yielded inconsistent findings regarding its factor structure. The only prior Turkish adaptation reported that seven items did not function adequately and were removed following exploratory factor analysis, leaving open whether this reflected genuine cultural unsuitability or methodological choices in the analysis of ordinal data. The present study re-examined the SD4 in a community sample of 417 Turkish adults (54.4% female,Mage = 30.4, SD = 12.5) using confirmatory factor analysis with the WLSMV estimator and polychoric correlations, the approach recommended for ordinal Likert data. At the item level, only one item (m1, “It is not wise to let people know your secrets”) showed a substantive problem (standardized loading = .14, with cross-loadings on Psychopathy and Sadism). The six remaining items removed by Aytaç [1] performed adequately in the present sample (loadings = .53–.74). A 27-item correlated four-factor model excluding m1 showed acceptable fit (CFI = .913, TLI = .904, RMSEA = .069 [.064, .074], SRMR = .070) and outperformed a unidimensional model. Multi-group analyses across gender supported configural, threshold (weak), and thresholdplus-loading (strong) invariance (all ΔCFI ≤ .005). Convergent validity was demonstrated through theoretically expected associations with the NPI-13, MPS, LSRP, and Violence Tendency Scale (r = .40–.69). Men scored higher than women on all four traits; effect sizes ranged from small for Narcissism (η2p = .010) to moderate–large for Sadism (η2p = .115, Cohen’s d = 0.72). The findings indicate that the original SD4 structure is largely retained in Turkish samples when ordinal-appropriate estimation is used, with Sadism emerging as the most strongly genderdifferentiated trait.

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  Delta-9-tetrahydrocannabinol ameliorates oxidative stress, mitochondrial redox state, and neuroinflammation induced by high-fructose diet

  (Springer Nature, 2026)

  Toprak, Muhammet Sait

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  Coşkun Yazıcı, Zeynep Mine

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  Yanar, Karolin

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  Bolkent, Sema

  Daha fazla

  This study investigates the effects of a high-fructose diet (HFD) on brain oxidative stress, mitochondrial redox state, and pro-inflammatory cytokine expression, and specifically evaluates whether delta-9-tetrahydrocannabinol (THC) attenuates these HFD-induced changes. Thirty-two Sprague–Dawley rats were divided into four groups: Control, HFD (10% fructose in drinking water for 12 weeks), THC (1.5 mg/kg daily for the last 4 weeks), and HFD + THC (HFD for 12 weeks with THC co-administration during the final 4 weeks). Biochemical biomarkers (AOPP, DT, KYN, MDA, AGE, T-SH, NADH, FAD, serotonin, insulin) and mRNA expression levels of inflammation-related genes (IL-6, IL-1β, TNF-α, NF-κB) were analyzed in brain tissues. The HFD significantly increased levels of protein oxidation (AOPP, DT, KYN, AGE); lipid peroxidation (MDA); and NADH and FAD fluorescence whilst decreasing total thiol (T-SH) content. HFD also increased the mRNA expression of all inflammatory markers examined. In contrast, THC treatment significantly reduced oxidative damage and NADH and FAD fluorescence and reduced the relative mRNA expression of the investigated inflammation-related genes. Strong positive correlations were observed between pro-inflammatory cytokine mRNA expression and oxidative stress markers. HFD causes significant biochemical and molecular damage to the brain. THC administration was associated with a significant attenuation of HFD-induced oxidative stress, mitochondrial redox state, and pro-inflammatory cytokine expression, suggesting that it may mitigate diet-associated neurochemical perturbations.

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  Grand strategy in the United States and China

  (BİDGE Yayınları, 2026)

  Abdollahi, Narjes

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  Özel, Mesut

  Daha fazla

  This chapter examines how grand strategy is conceptualized and implemented in the United States and China, focusing on the relationship between regime type and strategic continuity. Drawing on the distinction between grand plans, grand principles, and grand behavior, it traces major shifts in U.S. strategy from hemispheric priorities to Cold War containment and post-9/11 interventionism and follows Chinese strategic developments from Mao Zedong through reform and opening-up and subsequent multilateral engagement. It then compares the two states' approaches to threat perception, strategic transparency, domestic legitimacy, and the instruments used to shape international order. The chapter argues that electoral turnover and institutional checks in the United States generate more visible adjustments in strategic execution, while China's one-party structure supports greater continuity in overarching objectives, notwithstanding tactical change. It concludes by identifying the limits of strategy documents as predictors of state behavior in both systems.

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