Background: Multiple sclerosis (MS) is one of the increasing prevalent neurologic disorders. Epidemiologic and family studies implicate genetic and environmental factors in determining
susceptibility to MS. The exact effect of the former is intended for investigation in our study.
Objectives: The objective of the study is to compare the demographic features, clinical presenting features, and clinical course between familial and sporadic cases of MS.
Materials and Methods: this is a retrospective cohort study conducted in Multiple Sclerosis Center in the Medical City in Baghdad. The records of the MS center in Baghdad Teaching Hospital were surveyed, and data from 13 patients with positive family history of MS, and 13 patients with out family history of MS
was analyzed.
Results: Regarding the clinical presentation, for those with family history of MS the common presenting symptoms were sensory symptoms and transverse myelitis, and those without family history of MS was pyramidal, for those with family history of MS 11 patients had initial course of relapsing remitting MS ( 84.6%) ,of them 4 patients progressed into secondary progressive MS (36.4%); 2 patients had primary progressive MS as initial course, for those with negative family history of MS 12 patients had initial course of relapsing remitting MS, of them 5 patients progressed into Secondary progressive MS (41.6%); 1 patients had primary progressive MS as initial course (7.7 %.). No significant difference was found in
the investigated parameters, except for the inverse relation between age of onset and lag time to diagnosis.
Conclusion: Familial MS do not significantly differ from sporadic MS in terms of the demographic patterns and clinical course and presentation. This is not the case for the relationship between the age of disease onset and lag time to diagnosis.
The charge density distributions (CDD) and the elastic electron scattering form
factors F(q) of the ground state for some odd mass nuclei in the 2s 1d shell, such
as K Mg Al Si 19 25 27 29 , , , and P 31
have been calculated based on the use of
occupation numbers of the states and the single particle wave functions of the
harmonic oscillator potential with size parameters chosen to reproduce the observed
root mean square charge radii for all considered nuclei. It is found that introducing
additional parameters, namely; 1 , and , 2 which reflect the difference of the
occupation numbers of the states from the prediction of the simple shell model leads
to very good agreement between the calculated an
In this paper, estimation of system reliability of the multi-components in stress-strength model R(s,k) is considered, when the stress and strength are independent random variables and follows the Exponentiated Weibull Distribution (EWD) with known first shape parameter θ and, the second shape parameter α is unknown using different estimation methods. Comparisons among the proposed estimators through Monte Carlo simulation technique were made depend on mean squared error (MSE) criteria