[en] The optical constants (refractive index n, extinction coefficient k and dielectric constant ε) of some organic thin films were determined using reflectance and transmittance spectra. The real part and imaginary parts of the complex dielectric constant were calculated. The analysis of the optical absorption data revealed both optical direct and indirect transition with band gaps of 2.492-2.926 and 2.07-2.13 eV, respectively. The refractive index dispersion obeyed the Single oscillator of Wemple-Didomenico model and dispersion parameters and high-frequency dielectric constant were determined

[en] In this study, Einstein Field equations are obtained for charged strange quark matter attached to string and domain wall in the context of general relativity. For this purpose Einstein Field equations are solved in the spherically symmetric space-time via homothetic motions. Also, the features of obtained solutions are discussed

[en] There is a growing interest in cold-pressed oils because they present high contents of bioactive compounds. These oils have the characteristic properties of seeds and are specific products of their regions. The aim of this study was to determine the compositions and contents of fatty acids, phytosterols, squalene, tocols, phenolic acids, carotenoids and phenolic bioactives, and the free radical scavenging as well as antioxidant activities of cold-pressed pumpkin (Cucurbita pepo L.) seed oils. Oil samples from raw pumpkin seeds cultivated in four different central Anatolia regions of Turkey were prepared using a laboratory screw-pressing machine. The results indicate that cold-pressed pumpkin seed oils (PSO) have excellent quality with high contents of polyunsaturated fatty acids (%ΣPUFAs) (53.60 ±0.06-53.73 ±0.05), total phytosterols (782.1±9.7–805.2 ±11.3 mg/100 g oil), squalene (591.3±10.6–632.5±11.4 mg/100 g oil), tocols (97.79 ±0.76?94.29 ±0.34 mg/100 g oil), phenolic acids (22.73 ±0.41–23.98 ±0.46 mg/100 g oil), carotenoids (6.95 ±0.03–7.60 ±0.03 mg/100 g oil), total phenolics (3.96 ±0.13 –5.82±0.15 mg GAE/100 g), free radical-scavenging activity (5.70 ±0.13?7.35 ±0.15 mg GAE/100 g) and total antioxidant activity (26.67±0.97-38.89±1.41 mg GAE/100 g) values. Thus, this study demonstrates that the cold- pressed PSOs from the central Anatolia regions of Turkey are an excellent source of natural bioactive compounds, free of chemical contaminants and nutritious.

[en] Preparations are described of the hydrochloride of partially enriched N-methyl-2-(4-nitrophen[¹⁸O]oxy)ethanamine, N-methyl-2-(4-nitrophenoxy)-ethan[¹⁵N]amine, and N-methyl-2-(4-nitro[1-¹⁴C]phenoxy)ethanamine, designated herein as [¹⁸O]-2, [¹⁵N]-2, and [¹⁴C]-2, respectively. By base-catalyzed rearrangement these enriched ethanamine derivatives were converted, respectively, into N-methyl-N-(2-[¹⁸O]hydroxyethyl)-4-nitroaniline, N-methyl-N-(2-hydroxyethyl)-4-nitro[¹⁵N]aniline, and N-methyl-(2-hydroxyethyl)-4-nitro[1-sup0(14)C]aniline, designated as [¹⁸O]-3, [¹⁵N]-3, and [¹⁴C]-3. (author)

[en] Full text : The molecular geometry and vibrational frequencies of anhydrous zinc acetate and anhydrous magesium acetate in the ground state have been calculated using the Hartree-Fock and density functional method with 6-31G basic set. The optimized geometric band tengths and bond angles obtained by using HF and DFT show the best agreement with the experimental data. Comparison of the observed fundamental vibrational frequencies of melamine diborate with calculated results by density functional B3LYP and Hatree-Fock methods indicate that B3LYP is superior to the scaled Hatree-Fock approach for molecular vibrational problems

[en] 4-Nitro[1-¹³C]aniline has been prepared in overall yield of 54%, based on labeled acetone, by modification of a standard procedure. (author)

[en] This communication deals with the preparation and characterization (thermal analysis, IR spectra, NMR spectra) of a Cd(II), Co(II), Ni(II) and Zn(II) complexes with cyclobutane substituted Schiff bases. The preparation of the ligand is also described

[en] Adrenal metastasis is considered a rare hematogenous metastasis that develops after gastric cancer surgery. The chances of curative surgery are very low. It is usually unresectable. We aim to present a case of isolated adrenal metastasis that developed in a patient, who underwent a total gastrectomy with the diagnosis of gastric cancer approximately 26 months back. Left adrenalectomy was planned with curative intent. R0 resection was performed. The patient was followed up for one year after surgery. The option of surgical treatment is recommended for isolated metachronous adrenal metastases. Curative surgical resection may positively impact the prognosis of patients in selected cases. (author)

[en] Objective: To determine the relationship between resected specimen length and tumor location, the number of LN harvested (LNh), and the positive LN ratio (LNR) in colon cancer. Study Design: A descriptive study. Place & Duration of Study: Department of General Surgery, University of Health Sciences, Dışkapı Yıldırım Beyazıt Training and Research Hospital, Ankara, Turkey, between January 2009 and December 2019. Methodology: Colon specimens resected for colon cancer were evaluated retrospectively, in terms of tumor location, type of surgery, resected colon length, LNh and the number of metastatic LN, based on hospital records. Chi-square test, Kruskal-Wallis along with Dunn-Bonferroni post hoc tests were applied. The lymph node ratio (LNR) (= ratio of LN+ to LNh), the number of lymph nodes per unit distance (LNh/cm), the ratio of LNR to length of specimen (LNR/cm) were evaluated. Results: The rate of ≥12 LNh in 644 colon cancer patients was 81.4%. The length of colon specimen and the number of harvested lymph nodes (LNh) were higher in patients, who underwent subtotal colectomy (StC), compared to patients who underwent right and left hemicolectomy (RhC and LhC, p<0.001). Inadequate LNh was more common in LhC patients (p<0.001). The ratio of the number of LNh to the length of the resected specimen (LNh/cm) was higher in RhC and LhC patients than StC patients (p<0.001). LNR and LNR/cm were higher in LhC patients, though mean specimen length was shorter in LhC patients (p<0.05). The number of LNh had a direct proportion with the resected specimen length; however, the LNh/cm and LNR/cm ratios decreased in >50 cm length specimen patients (p<0.001). Conclusion: Central LN dissection and vascular high ligation, according to tumor site are more efficient than the length of the resected specimen for an adequate LN dissection in colon cancers. (author)

[en] Objectives: To evaluate the diagnostic value of the rtRT-PCR test and CT in patients presenting with typical clinical symptoms of COVID-19. Methods: The study with the participation of four center in Turkey was performed retrospectively from 20 March-15 April 2020 in 203 patients confirmed for COVID-19. The initial rtRT-PCR test was positive in 142 (70.0%) of the patients (Group-I) and negative in 61 patients (Group-II). Results: The mean age of the patients in Group-I was 49.7±18.0 years and the time between the onset of symptoms and admission to the hospital was 3.6±2.0 days; whereas the same values for the patients in Group-II were 58.1±19.9 and 5.3±4.2, respectively (p=0.004; p=0.026). Initial rtRT-PCR was found positive with 83.5% sensitivity and 74.1% PPV in patients with symptom duration of less than five days. It was found that rtRT-PCR positivity correlated negatively with the presence of CT findings, age, comorbidity, shortness of breath, and symptom duration, while rtRT-PCR positivity correlated positively with headache. Presence of CT findings was positively correlated with age, comorbidity, shortness of breath, fever, and the symptom duration. Conclusions: It should be noted that a negative result in the rtRT-PCR test does not rule out the possibility of COVID-19 diagnosis in patients whose symptom duration is longer than five days, who are elderly with comorbidities and in particular who present with fever and shortness of breath. In these patients, typical CT findings are diagnostic for COVID-19. A normal chest CT is no reason to loosen up measures of isolation in patients with newly beginning symptoms until the results are obtained from the PCR test. (author)