ABSTRACT
We present the results of our performance studies of the upgraded Cherenkov time-of-flight (ToF) detector for the AFP (ATLAS Forward Proton) project. The latest version consists of solid L-shaped fused silica bars, new customized ALD-coated micro-channel plate photomultipliers (MCP-PMTs) miniPlanacon XPM85112-S-R2D2 with an extended lifetime which operate at low gains (order of 103), and an updated construction. The improvements were aimed to increase the efficiency, the lifetime as well as the radiation hardness of the detector which has been designed to operate in high radiation areas (above 400 kGy/year). The detector was finally tested at the CERN-SPS test-beam facility (120 GeV π+ particles) in August 2021 prior to its installation at the Large Hadron Collider (LHC) at CERN. Measurements proved the detector kept its inner timing resolution of 20 ps despite the rather low gain of its photodetector and reduced optical throughput caused by inevitable changes in the detector geometry.
ABSTRACT
AIM: To evaluate the impact of long-term partial parenteral nutrition and its complications on malocclusion in children and adolescents. MATERIAL AND METHODS: The assessment involved 61 patients (2.25 to16 years of age) without a masticatory parafunction - i.e. 31 subjects receiving parenteral nutrition for a mean period of 5.71±2.87 years, and 30 healthy control subjects. The medical records provided information on the delivery (full-term, preterm), birth body mass, Apgar score, weight deficiency at the age of 1 year; the patient assessment included the current body mass, the number of enteral meals per day and parenteral meals per week, occlusion (acc.to Orlik-Grzybowska's parameters). The statistical analysis was performed by using the chi-square test, Spearman's correlation analysis; the statistical significance was p<0.05. RESULTS: Premature infants with low birth body mass (38.7%), Apgar score below 7 (25.8%), underweight in the first year of life (74.2%) and on examination day (58.1%) were only part of the test group. Mean number of eaten meals: 4.63±1.88 in parenteral nutrition patients, 6.26±1.39 in healthy individuals in the control group. Malocclusions were significantly more frequent in the children receiving parenteral nutrition (38.71%: the most frequent defects included crossbite (19.31%), open bite malocclusion (12.9%), crowding of teeth (9.67%), than in the control group (13.3%: crossbite (3.3%), open bite malocclusion (3.3), crowding of teeth (3.3%). A correlation was statistically proved between the malocclusion and parenteral nutrition, the number of parenteral feeding sessions per week, the current low body mass. CONCLUSION: Long-term parenteral nutrition, a decreased number of oral meals and a coexistent low body mass at the developmental age may contribute to the development of malocclusion.
ABSTRACT
BACKGROUND & AIMS: Available evidence suggests that patients with short bowel syndrome (SBS) might be at risk of vitamins A, D, E and B(1) deficiency. However, there is little clinical data describing the vitamin K status. Therefore, in the present study we aimed to assess the body resources of vitamin K in a subset of SBS patients. METHODS: The study comprised 33 patients aged 1 month to 16 years. PIVKA-II concentrations were determined in all subjects. RESULTS: In all studied subjects, coagulation parameters were normal. PIVKA-II levels indicative of vitamin K deficiency was found in 3 (9.1%) SBS patients. One patient had been receiving an additional intravenous vitamin K dose of 5 mg/week. In all SBS patients with cirrhosis and cholestasis, PIVKA-II concentrations were low (<2 ng/ml). However, all patients with severe liver disease were receiving vitamin K several times a month. CONCLUSIONS: Vitamin K deficiency may appear in SBS patients.
