Enhancement of Heat Transfer Performance of a Heat Pipe by Using Calcium Magnesium Carbonate-Ethylene Glycol/Water Nanofluid with Sodium Dodecylbenzene Sulfonate

In this paper, the effect of using CaMg(CO3)2/Ethylene Glycol-water (50:50%) as a working fluid on the thermal performance of thermosyphon heat pipe was experimentally studied. Nanofluid was prepared by two-step method using 2% concentration of CaMg(CO3)2 nanoparticle and 0.05% surfactant (Sodium dodecylbenzene sulfonate). For the experimental set-up, a straight copper pipe of one-meter length was used. The inner diameter of the pipe is 13 mm, and the outer diameter is 15 mm. Experiments were conducted at three different cooling water mass flow rates (5, 7.5, and 10 g/s) and different heating powers (200, 300, 400 W) to test heat pipe performance. It was observed that the CaMg(CO3)2 nanofluid reduced the average wall temperature of the heat pipe according to the base fluid. Furthermore, the efficiency and thermal resistance of the heat pipe were investigated separately for EG/water and CaMg(CO3)2 nanofluid. The maximum heat transfer enhancement was obtained as 9.55% under 400 W heating power and 10 g/s cooling water mass flow rate conditions and the maximum improvement in thermal resistance was observed as 21% at 200 W and 10 g/s cooling mass flow rate. Viscosity and specific heat of base fluid and CaMg(CO3)2 nanofluid were also determined and compared to each other

The protective effects of red ginseng and amifostine against renal damage caused by ionizing radiation

This study aimed to elucidate the effects of amifostine (ethyol) (AM), a synthetic radioprotector, and red ginseng (RG), a natural radioprotective agent, against the toxic effect of ionizing radiation (IR) on kidney tissues through changes in biochemical and histopathological parameters in addition to contributions to the use of amifostine and RG in clinical studies. Five groups were established: Group I (control, receiving only saline by gavage), Group II (IR only), and Group III (IR+AM, 200 mg/kg intraperitoneally (i.p.). Group IV (IR + RG, 200 mg/kg orally once a day for 4 weeks), and Group V (IR+RG+AM, 200 mg/kg orally once/day for 4 weeks before IR and 200 mg/kg AM administered (i.p.) 30 min before IR). All groups, except for the control group, were subject to 6-Gy whole-body IR in a single fraction. 24 h after irradiation, all animals were sacrificed under anesthesia. IR enhanced MDA, 8-OHdG, and caspase-3 expression while decreasing renal tissue GSH levels (p < .05). Significant numbers of necrotic tubules together with diffuse vacuolization in proximal and distal tubule epithelial cells were also observed. The examination also revealed substantial brush boundary loss in proximal tubules as well as relatively unusual glomerular structures. While GSH levels significantly increased in the AM, RG, and AM+RG groups, a decrease in KHDS, MDA, 8-OHdG, and caspase-3 expression was observed, compared to the group subject to IR only (p < .05). Therefore, reactive oxygen species-scavenging antioxidants may represent a promising treatment for avoiding kidney damage in patients receiving radiation

Association between cigarette smoking and breast milk levels of nesfatin-1, irisin, and oxidative stress markers

Background: Breast milk is a very important functional food in the prevention of metabolic and chronic diseases. This study aimed to investigate the effects of smoking during pregnancy on the concentrations of nesfatin-1, irisin, and oxidative stress markers in breast milk. Methods: This study included two groups of 14 smoking and 14 nonsmoking mothers. Malondialdehyde (MDA) level and superoxide dismutase (SOD) activity were measured according to the spectrophotometric method in breast milk samples. Nesfatin and irisin levels were measured by enzyme-linked immunosorbent assay. Results: Levels of nesfatin-1 and MDA of the smoking group were significantly higher than those in the control group (p 0.050). Conclusions: Cigarette smoking increases MDA level and decreases SOD activity in breast milk. Nesfatin-1 levels would increase in accordance with increased oxidative stress, and nesfatin-1 acts as a protective mechanism to limit oxidative damage

Evaluation of microsatellite instability in colorectal adenomas and carcinomas by immunohistochemistry and a comparison of histopathological features

Objective: Approximately 15% of sporadic colorectal carcinomas (CRCs) develop along the microsatellite instability (MSI) pathway. In this study, we compared the MLH1, MSH2, Ki-67, and p53 immunostaining properties with histopathological features of colorectal adenomas and CRCs. Methods: A total of 102 cases were selected, including 50 adenomatous polyps, 25 adenocarcinomas, 10 adenocarcinomas with mucinous component, 14 mucinous adenocarcinomas, and three signet-ring cell carcinomas. The tissues were stained for MLH1, MSH2, p53, and Ki-67 primary antibodies. Results: Negative staining was observed for MLH1 in 25% and MSH2 in 3.8% of all CRC cases. Compared with adenocarcinoma not otherwise specified (NOS), mucinous adenocarcinomas showed weaker staining for MLH1, which was statistically significant. There was also a statistically significant difference between adenocarcinoma NOS and signet-ring cell carcinomas in terms of negative staining for MLH1. A total of 69.2% of the MLH1-negative cases were high-grade. There was a statistically significant relationship between the histological grade and MLH1 negativity. A positive correlation was found between the grade of dysplasia and p53 staining intensity and Ki-67 proliferation index. No negative staining was observed for MLH1 and MSH2 in any of the adenomatous polyps. Conclusion: For the histopathological examination of CRCs, in the presence of mucinous and poorly differentiated morphology, tumor-infiltrating lymphocytes and Crohn-like inflammatory response, immunohistochemical staining for MLH1, and MSH2 antibodies may be useful in the detection of tumors showing MSI

Factors that Affect Prognosis and Morbidity in Pediatric Patients with Carbon Monoxide Poisoning

Introduction:Carbonmonoxide poisoning continues to be a major health problem worldwide, especially in developing countries, and constitutes an important part of the patients admitted to the pediatric emergency clinics due to poisoning. The aim of this study was to evaluate the correlation between clinical severity, morbidity, hospital stay, intensive care need, and full systemic effects in patients who were followed up and treated for carbon monoxide poisoning in our pediatric emergency clinic.Methods:The study was performed between January 2013 and 2015. We included patients under 18 years of age who were admitted to the pediatric emergency with carbon monoxide poisoning. Assessments were made prospectively. The epidemiological characteristics, complaints, physical examination and vital findings of all patients were recorded. Carboxyhemoglobin (COHb) level, oxygen saturation, electrocardiography, complete blood count, liver and kidney functions, and cardiac enzymes were studied, and Glasgow Coma scale (GCS) was calculated.Results:The mean length of hospital stay for 232 patients was calculated as 7.08±1 hours and the mean duration of exposure to carbon monoxide gas was 3.17±2.5 hours. Higher COHb levels and cardiotoxicity were detected in patients with a longer duration of exposure and a lower GCS and an increased intensive care need (p<0.01). There was no correlation between COHb levels and clinical severity, GCS, or intensive care unit need. However, it was found that high COHb levels (especially above 30%) increased cardiac injury and neurological symptoms but did not cause a permanent sequela (p<0.05). None of the patients had permanent neurological, cardiac, or renal damage.Conclusion:We found that duration of exposure is the most important and accurate parameter for the evaluation of clinical course and morbidity. In patients with high COHb levels, the effects are more prominent, however, we considered that there was no change in sequelae at long-term follow up

Hospitals, Unions, and Strikes

In April 12, 1967, the majority of the non-professional employees of St. Luke\u27s Hospital of Cleveland, Ohio, members of Local 47, Building Service and Maintenance Union, walked off their jobs and set up picket lines across the entrance of the Hospital. In addition to bringing into the limelight the extremely poor working conditions in modern non-profit hospitals, the strike also pointed out a serious shortcoming of the law in Ohio and most other states. Before we can fully understand the problems of employees in non-profit hospitals, it is useful to briefly review the history of the modern hospital

Evaluation of electrocardiographic ventricular and atrial repolarization markers in patients with high grade varicocele

Aim: Varicocele is abnormal dilation of testis veins without unclear pathophysiology. Morphological studies showed imbalance between vasoconstrictor and vasodilator mechanisms. We aimed to determine the relationship between varicocele and cardiovascular system disorders with electrocardiography (ECG) parameters. Methods: This is a prospective study which was conducted in a University Hospital between February and June 2018. Thirty patients (18-45 years old) with high grade varicocele from urology outpatient clinic and 32 healthy volunteers for the control group were recruited to the study.&nbsp; Results: P-min. value was significantly higher in control group than patients with high grade varicocele (p= 0.03). PR, QT and QTc intervals, PWD and P-max values were similar. Also, there were no significant differences in terms of the other ECG parameters&nbsp;between the groups. Conclusions: In this small prospective study we have found no association between high grade varicocele and potential electrocardiographic arrhythmia predictors namely OTd, QTc interval, PWD, Tp-e interval, Tp-e/QT ratio and Tp-e/QTc ratio. Long-term follow-up and large-scale prospective studies are needed to confirm our results

Resveratrol against lung injury in an ischemia/reperfusion model of abdominal aortic rupture

Background: The aim of this study was to examine the effects on the lungs of ischemia/reperfusion injury in a ruptured abdominal aortic aneurysm model in rats and to investigate the potential protective effects of resveratrol. Methods: Thirty-two male Sprague-Dawley rats were randomly divided into four groups: control, ischemia/reperfusion, sham (ischemia/ reperfusion + solvent/dimethyl sulfoxide), and ischemia/reperfusion + resveratrol. In the groups subjected to ischemia/reperfusion, following 60-min shock to the abdominal aorta, vascular clamps were attached from the levels of the infrarenal and iliac bifurcation. A total of 60-min ischemia was applied, followed by 120-min reperfusion. In the ischemia/ reperfusion + resveratrol group, intraperitoneal 10 mg/kg resveratrol was administered 15 min before ischemia and immediately after reperfusion. Malondialdehyde, glutathione, and catalase levels were analyzed and histopathological examination of the lung tissues was performed. Results: Malondialdehyde levels increased in the ischemia/reperfusion and ischemia/reperfusion + dimethyl sulfoxide groups, compared to the control group, while catalase levels decreased, and no significant difference was observed in the glutathione levels. Malondialdehyde levels decreased with the administration of resveratrol, while glutathione levels increased, and catalase levels remained unchanged. The increased inflammation in interstitial spaces, thickening in the alveolar septal walls, increased numbers of cleaved caspase-3 apoptotic pneumocytes, and increased histopathological lung damage scores observed in the ischemia/reperfusion and ischemia/reperfusion + dimethyl sulfoxide groups improved with the application of resveratrol. Conclusion: These findings suggest that resveratrol may exhibit a protective effect in preventing acute lung injury developing due to ischemia/reperfusion in ruptured abdominal aortic aneurysm surgery by reducing oxidative damage

The effects of dexmedetomidine against ruptured abdominal aortic aneurysm injury to myocardial tissue induced by abdominal aorta clamping

Objectives: This study aims to examine the potential protective effect of the selective alpha-2 adrenergic receptor agonist dexmedetomidine (DEX) against aortic occlusion-induced myocardial injury. Patients and methods: A total of 30 rats were randomly assigned into three groups of 10 animals each as control, ischemia+reperfusion (I/Rep), and I/Rep+DEX. In the I/Rep and I/Rep+DEX groups, after the completion of the shock stage, 60-min lower torso ischemia was induced with the application of cross-clamps to the abdominal aorta, followed by 120-min reperfusion. The I/Rep+DEX group received intraperitoneal 100 µg/kg DEX 30 min before the ischemia period. Results: Malondialdehyde (MDA) levels in myocardial tissue increased with the application of I/Rep, while glutathione (GSH) levels decreased. We also observed swollen, degenerative, apoptotic cardiac myofibrils exhibiting caspase-3 positivity, widespread edematous areas, vascular congestion, and an increase in the heart damage scores. The MDA levels decreased with DEX administration, while the GSH levels increased. Degenerative, apoptotic cardiac myofibrils exhibiting loss of cytoplasm content, and vascular congestion also decreased. Conclusion: Our study results suggest that DEX may have a future role in the treatment of myocardial damage occurring due to reperfusion, following ruptured abdominal aortic aneurysm surgery