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For a light burst generated by an x ray-scintillator interaction, the quasi-isotropic spreading of optical quanta determines that both the light collection efficiency and the spread function of the light burst depend on the depth (z) of interaction the closer the initial position of light burst to the light sensor, the less light loss and spatial resolution degradation a detector system encounters. For scintillator-based indirect-conversion detectors, the variation of the x-ray conversion gain and the MTF along the z direction contributes to a significant fraction of DQE loss and is known as the Lubberts effect. Understanding the physics behinds the effect and developing solutions to reduce the effect have led to tremendous improvements in the performance of indirect-conversion detectors. In contrast, for direct-conversion photon counting detectors (PCDs), since no optical quanta generation or transport is involved, there is no classical Lubberts effect. However, the transport properties of the generated charge carriers in semiconductors do depend on their travel distance. As a result, the performance of direct conversion detectors may depend on z. This dependence can be considered as a counterpart of the classical Lubberts effect. The purpose of this work is to analyze the contributions of a variety of physical mechanisms that may contribute to a Lubberts-like effect in direct-conversion PCDs. The results show that the Lubberts-like effect is primarily caused by the depth-dependent charge trapping and recombination likelihood. Based upon the physics analysis, PCD electrode design can be optimized to minimize the Lubberts-like effect and the associate DQE loss.Hydatid disease (HD) is an infectious disease caused by echinococcosis. Hydatid cyst (HC) most commonly invades the liver (60-70%) and the lungs (20-25%). However, other parts of the body and even unusual locations can be infected, mimicking a benign lesion that could be easily missed. Primary HC of the chest wall is extremely rare, even in countries where echinococcosis is endemic. We herein present a case of a 40-year-old man with a right-sided growing thoracic wall mass. The patient did not present the relevant history (living in rural areas or being in contact with farm animals) and the serological examination with the indirect hemagglutination test was negative. During surgery, a cystic mass between the eleventh and twelfth ribs was observed. The thoracic wall mass extended to the posterior abdominal wall and was entirely extrapulmonary and extraperitoneal. All cystic structures of the thoracic wall and intrathoracic region were removed, and the primary defect was reconstructed. In endemic areas such as Iran, HD should be considered in the differential diagnosis of mass lesions located in the chest wall or other parts of the body, even without the relevant history or serologic evidence.Background Inflammatory bowel disease (IBD), of which Crohn's disease (CD) and ulcerative colitis (UC) are the two main clinicopathological subtypes, is a group of digestive system diseases of unknown etiology. Risk factors for IBD are environmental factors, genetics, and immune system agents. Mycobacterium avium subspecies paratuberculosis (MAP) is one of the most important infectious factors and a suspected cause of IBD. The present study aimed to determine the prevalence of MAP in both IBD patients and non-IBD people as well as to investigate the relationship between the presence of this bacterium and IBD. https://www.selleckchem.com/products/mln2480.html Methods A cross-sectional study was conducted during May-December 2017 among 146 IBD patients (32 with CD and 114 with UC) at the Motahari Clinic affiliated to Shiraz University of Medical Sciences, Shiraz, Iran. For comparison, the blood samples of 146 non-IBD volunteers (the control group) were tested for the presence of MAP using the polymerase chain reaction method (specific IS900 fragment). The data were analyzed using the SPSS software (version 19.0). The Kolmogorov-Smirnov test was used to evaluate the normal distribution of variables. The χ2 test was used to compare the qualitative variables between the groups. Results MAP was present in 104 (71.2%) IBD patients out of which 24 (75%) had CD and 80 (70.2%) had UC. In the control group, MAP was present in 63 (43.2%) non-IBD volunteers. There was a significant association between the presence of IBD and MAP (P less then 0.001). Conclusion A high prevalence of MAP was observed in the South of Iran. MAP DNA was detected in the blood samples of CD and UC patients as well as non-IBD volunteers. The high prevalence of MAP indicated a possible role of MAP in stimulating IBD.Background Persian Medicine is one of the oldest and richest complementary and alternative options in the field of medicine and has a comprehensive medical system. Henna oil is recommended in Persian Medicine for the treatment of numerous women's diseases such as cervicitis. To date, henna has been used for many medical purposes, including astringent, bleeding, cardioinhibitory, hypotension, and relaxation. Accordingly, the present study aimed to provide the formulation of a henna-oil-based vaginal suppository and examine its physicochemical and antimicrobial properties. Methods The present study was approved and performed in accordance with the regulations of Research Council, Kerman University of Medical Sciences, Kerman, Iran, in July 2016. Different percentages of henna oil, glycerin, and gelatin, as well as henna oil and polyethylene glycol 400 and 4000, were mixed to achieve a formulation with proper appearance features and, particularly, without any oil leakage from the suppository surface. Uniformity of weight, uniformity of content, disintegration time, and dissolution test of the suppositories were evaluated. The growth-inhibiting activity of the suppositories and aqueous extract of henna was evaluated against bacteria, including the Gram-positive bacterium Gardnerella vaginalis, Neisseria gonorrhoeae, and group B streptococcus. Results The formulations had a smooth appearance without any cracks or fractures. Disintegration times for glycero-gelatin and polyethylene glycol suppositories were 60 and 10 min, respectively. 40% of the drug was released from polyethylene glycol suppositories after 60 min, but glycero-gelatin suppositories had no release after three hours. Minimum inhibitory concentration (MIC) of suppositories and aqueous extract were 0.4 mg/mL and 0.01 mg/mL, respectively. Conclusion Polyethylene glycol suppositories had acceptable physicochemical properties, and the henna extract and suppositories inhibited the three studied pathogens.
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