Onset of magnetism in B2 transition metals aluminides

Ab initio calculation results for the electronic structure of disordered bcc Fe(x)Al(1-x) (0.4<x<0.75), Co(x)Al(1-x) and Ni(x)Al(1-x) (x=0.4; 0.5; 0.6) alloys near the 1:1 stoichiometry, as well as of the ordered B2 (FeAl, CoAl, NiAl) phases with point defects are presented. The calculations were performed using the coherent potential approximation within the Korringa-Kohn-Rostoker method (KKR-CPA) for the disordered case and the tight-binding linear muffin-tin orbital (TB-LMTO) method for the intermetallic compounds. We studied in particular the onset of magnetism in Fe-Al and Co-Al systems as a function of the defect structure. We found the appearance of large local magnetic moments associated with the transition metal (TM) antisite defect in FeAl and CoAl compounds, in agreement with the experimental findings. Moreover, we found that any vacancies on both sublattices enhance the magnetic moments via reducing the charge transfer to a TM atom. Disordered Fe-Al alloys are ferromagnetically ordered for the whole range of composition studied, whereas Co-Al becomes magnetic only for Co concentration >0.5.Comment: 11 pages with 9 embedded postscript figures, to be published in Phys.Rev.

Reference values for hand muscle strength evaluation methods in healthy young adults

PubMedID: 31033455BACKGROUND AND OBJECTIVE: This study determined the hand muscle strength parameters and reference values in healthy subjects using the Nicholas Manual Muscle Tester (NMMT) and Manual Muscle Test (MMT) and compared these methods. METHODS: The study was carried out with 200 (102 males, 98 females) healthy adults aged between 18-25 years. Muscle strength evaluations of the hand were performed to determine hand motor ability using both NMMT and MMT. RESULTS: The mean values of age, weight, height and body mass index (BMI) were 19.48 ± 0.95 years, 60.66 ± 8.82 kg, 165.30 ± 7.95 cm and 22.14 ± 2.25 kg/m2, respectively, in females, whereas the same values were found as 20.40 ± 1.34 years, 72.53 ± 9.45 kg, 176.20 ± 6.29 cm and 23.25 ± 2.90 kg/m2, respectively, in males. There was a statistically significant difference in all demographic data between genders (p< 0.05). Furthermore, correlation coefficient in NMMT was found to be between 0.503 and 0.954. However, there was no correlation between the MMT and NMMT results. CONCLUSION: The observations presented need to be taken into consideration for evaluate musculoskeletal problems and also can be used as reference values for evaluating treatment outcomes. © 2019 - IOS Press and the authors. All rights reserved

Role of calcium-sensing receptor, Galectin-3, Cyclin D1, and Ki-67 immunohistochemistry to favor in the diagnosis of parathyroid carcinoma

Background: As histopathological findings of parathyroid carcinoma are not certain, the diagnosis of tumors with degenerative changes may be difficult. In these cases, immunohistochemical markers are beneficial. We aimed to research the acceptability of calcium-sensing receptor (CaSR), Galactin-3, Cyclin D1, and Ki-67 as helpful markers in parathyroid tumors in cases which are difficult to diagnose. Materials and Methods: Those cases who had been diagnosed with atypical parathyroid adenoma and parathyroid carcinoma between 2010 and 2015 were reevaluated. İmmunohistochemical markers were applied to this cases. Results: About 21 cases were parathyroid adenoma, 14 were atypical adenoma, and 10 cases were parathyroid carcinoma. According to the immunohistochemical results, global loss of CaSR staining was seen in 50% (5/10) of the patients with carcinoma while there was no loss of staining in those with parathyroid adenoma (P = 0,001). Global loss of CaSR staining was found in only one out of 14 cases with atypical adenoma. The expression of Galactin-3 was found to be positive in 40% (4/10) of carcinoma cases, 71.4% (10/14) of those with atypical adenoma, and 14.3% (3/21) of those with adenoma (P = 0,002). Cyclin D1 expression was determined to be positive in 70% (7/10) of patients with carcinoma, 71.4% (10/14) of atypical adenoma cases, and 23.8% (5/21) of those with adenoma. The Ki-67 proliferation index was seen to be above 5% in 50% (5/10) of carcinoma cases and 35,7% (5/14) of those with atypical adenoma. Conclusion: In these studies, it has been emphasized that the global loss of CaSR staining was used as a negative marker in the diagnosis of carcinoma. In this study, we have also confirmed that the global loss of CaSR staining is a useful marker to determine potential increased malignancy

Investigation of congenital CMV infection with the presence of CMV DNA in Saliva samples of new born Babies [Yenidogan Bebeklerin Tükürük Örneginde CMV DNA Varligi ile Konjenital CMV Enfeksiyonunun Araştirilmasi]

###EgeUn###Cytomegalovirus (CMV), is the most common cause among congenital infections and is the most seen etiology in long-term sensorineural hearing loss (SNHL) and neurological impairment. Congenital CMV infection (CCMV) was reported in 0.15-2.2% of live-borne neonates in studies from different countries. A significant proportion of infected infants are asymptomatic after birth and might only be detected by routine screening methods during the new born period. The aim of this study was to screen the saliva of live-born neonates with areal-time PCR based method for the detection of CCMV in our hospital. Saliva samples collected in half an hour after birth by dry dacron swabs and were evaluated for CMV DNA (Rt-PCR, Abbott Molecular USA) from 1000 babies born in Ege University Faculty of Medicine Hospital Obstetrics Clinic between October 2015-October 2017. For the confirmation of CCMV, saliva positive newborns were evaluated with the same method for CMV DNA from their urine or blood within 21 days. All newborns were screened for sensorineural hearing tests. Subjects were 497 girls (49.7%) and 503 boys (50.3%), with a mean weight of 3116.8 g and mean of 37.61 birth week. CMV DNA was positive in the saliva of 16 newborns (1.6%). Fourteen newborns were weakly positive for CMV DNA in their saliva and were not confirmed for CCMV infection. Congenital CMV was confirmed in only two (0.2%) with the CMV DNA results in urine and/or blood samples. One of the two newborns with CCMV was symptomatic and had a neurosensorial hearing loss. The other one was asymptomatic. Saliva samples, taken immediately after birth with a noninvasive and easy method for the detection of CMV DNA is very important for diagnosis of CCMV. Positive samples should be confirmed with CMV DNA in urine or blood samples of these newborns. In this study, detection of positivity in saliva samples that were confirmed with other samples of our newborn population for CCMV was 0.2%. The specific diagnosis for CCMV in newborns with a noninvasive and easy collecting sample is important to avoid sequelae and for public health concerns. © 2019 Ankara Microbiology Society. All rights reserved

Mechanical Properties of Amorphous Silicon Nanoparticles

International audienceThe compression of amorphous silicon nanoparticles is investigated by means of molecular dynamics simulations, at two temperatures and for diameters equal to 16 nm and 34 nm. The nanoparticles deform plastically, with maximum contact stresses in the range 8.5-11 GPa, corresponding to strains between 12% and 24%. No clear size effect is observed. Despite large contact stress values, the formation of high density crystalline or amorphous phases is not observed, presumably due to the presence of lateral free surfaces allowing for plasticity deconfinement. Atomic displacements analysis confirms that during plastic deformation, atoms close to indenters are first pushed towards the nanoparticle center, before migrating laterally towards free surfaces. Plastic deformation leads to an increase of fivefold coordinated atoms, which are spatially correlated with the largest atomic displacements