47 research outputs found

    Comparative Study of Structural and Electrical Study of Bismuth Doped At La and Mn Site of La0.7Sr0.3mno3

    Get PDF
    We report the structural and electrical properties ofpolycrystalline bismuth (Bi) doped La0.7Sr0.3MnO3 (x = 0, 0.1 and0.2) at La(A) and Mn(B) site. Refinement of X-ray powderdiffraction patterns show that all samples crystallize inRhombohedral structure with R-3C space group. There isdecrease in unit cell volume as well as metal to insulatortransition temperature TMI in both site Bi doping. It is found thatvalues of resistivity are higher at B site doping compared that ofA site for all concentrations. It is found that the value of TMI is a233K and 227K and resistivity at peak is 184m Ω-cm and675mΩ-cm in La and Mn doped samples respectively for x=0.1.The competition between the Mn–O–Mn double exchange andthe Bi–O–Mn super-exchange of Mn3+ by Bi3+ may explain theincrease in resistivit

    Hand surgery for Multicentric Reticulohistiocytosis: A new avenue of treatment and review of the literature

    Get PDF
    AbstractINTRODUCTIONMulticentric Reticulohistiocytosis (MRH) is a rare non-Langerhans cell histiocytosis characterised by destructive polyarthritis and violaceous skin papules.PRESENTATION OF CASEIn 2010, a 70-year-old woman with Palindromic Rheumatism was diagnosed with MRH. Within a few months, she developed ankylosis of the small joints of both hands which resulted in severe fixed flexion deformities of the fingers and thumbs. The joint disease failed to respond to medical therapies and the palmar skin of her left hand was becoming increasingly macerated. Therefore, she elected to undergo arthrodesis of the metacarpophalangeal joints to allow hand hygiene.DISCUSSIONTo-date, this is the first report of a surgical intervention for this rare condition and represents a novel avenue of potential therapy. Medical therapies for MRH are usually ineffective in preventing the debilitating small joint disease which often develops and there is on-going research into newer agents and alternative surgical techniques.CONCLUSIONOnce medical therapies are exhausted, clinicians should consider the input of Hand Surgeons in managing the inevitable and mutilating joint disease of this rare condition

    Outcome of arthroscopy in patients with advanced osteoarthritis of the hip.

    No full text
    Hip arthroscopy has continued to expand its horizons in treating many conditions other than femoroacetabular impingement (FAI). However, the results of hip arthroscopy are known to be poor if the degree of articular cartilage damage is significant. We wanted to assess, whether the procedure might have a role in the management of young and active patients with advanced osteoarthritis (OA) and whether it should be offered as a treatment modality. 77 consecutive patients with Tönnis grade 2 and 3 osteoarthritis of the hip who had undergone hip arthroscopy were included in the study. Patients' medical notes, plain radiographs and outcome scores (modified Harris hip score (mHHS), non-arthritic hip score (NAHS)) preoperatively and postoperatively at six weeks, six months, one year and annually thereafter, were analysed. 77 patients consisted of 63 men and 14 women with mean follow-up of 2.8 years (2.2 to 4.2) and mean age at surgery of 43 years (19 to 64). The mean preoperative mHHS and NAHS scores were 58 (28 to 87) and 64 (27 to 93) respectively. The mean improvements in both the mHHS and NAHS scores were significant (p = 0.003 and p = 0.0001 for mHHS at one and two years, p = 0.002 and p = 0.0003 for NAHS at one and two years, respectively). There were 34 patients (44%) who required a total hip replacement at mean of 18 months (6 to 48) after hip arthroscopy. We conclude that hip arthroscopy improves outcome scores in 56% of patients with severe OA of the hip (Tönnis grade 2 and 3) for at least two years after surgery. We thus consider the procedure to be a reasonable option for patients with hip OA, although success of the procedure will be less than if undertaken for certain other conditions

    Electrical conduction and thermal properties of Bi-doped Pr0.7Sr0.3MnO3 manganite

    Get PDF
    Electrical and thermal properties of Bi-doped Pr0.7Sr0.3MnO3 (PSMO) compounds are reported here. It is observed that Bi-doped PSMO compounds follow variable range conduction mechanism. Specific heat, thermal conductivity and thermo-power measurements show that larger Bi-ion, in place of smaller Pr ion, enhances their transition temperatures (T-MI, T-C, T-CP). Thermo-power measurements further strengthen our conclusion for the presence of magnetic polaron, generated due to hybridization of Bi3+-6s(2) and O2--2p orbital and polaronic conduction mechanism

    Etiology of osteoarthritis in patients.

    No full text
    <p>Etiology of osteoarthritis in patients.</p

    Procedures carried out during hip arthroscopy.

    No full text
    <p>Procedures carried out during hip arthroscopy.</p
    corecore