[en] The Spectrophotometric method for the determination of trace amount of Uranium in aqueous and organic samples has been developed. The method is proved very accurate and precise for rapid determination of Uranium with Dibenzoyl Methane (DBM) in Methanol medium instead of Pyridine medium. The maximum absorbance occurs at 410 nm with a molar absorptivity of 4.5 x 104 L.mole/sup -1/.cm/sup -1/.The linear calibration curve through the point of origin was obtained up to 10 mu gm L/sup -1/ of Uranium (VI). The relative standard deviation is +- 2%. In case of aqueous samples extraction procedure is adopted to obtain organic phase while organic samples are treated as such. (author)

[en] Experimental methods to measure the vector analyzing powers A/sub y/(Theta) of several processes in the n-d breakup reaction are being developed at TUNL. Several processes which are kinematically allowed illustrate the experimental richness of this reaction. In the final state interactions (FSI), the maximum enhancement to the cross section of the breakup reaction occurs when the relative energy between two of the exiting particles is near zero (E/sub nn/ approx. 0 or E/sub np/ approx. 0). The enhancement to the cross section due to the quasi-free scattering processes (QFS) occurs when the energy of one of the final particles is near zero in the lab frame. Consequently, this particle is commonly referred to as a spectator; nucleons in both the incident projectile and the target can be spectators. Two less-familiar processes are the collinear and star configurations. Collinearity is the special case of QFS in which one of the final particles has nearly zero energy in the c.m. system (spectator) and the other two particles exist with equal momenta in opposite directions (pvector2 = pvector3), thus the exiting particles form a straight line in the c.m. system. In the star configuration the final particles exit with equal momenta and equal interparticle angles in the c.m. system. Several proposed experiments are described

[en] We construct propagators in Euclidean AdS(d+1) space-time for massive p-forms and massive symmetric tensors. (author)

[en] We study brane configurations for four dimensional N=1 supersymmetric gauge theories with quartic superpotentials which flow in the infrared to manifolds of interacting superconformal fixed points. We enumerate finite N=2 theories, from which a large class of marginal N=1 theories descend. We give the brane descriptions of these theories in Type IIA and Type IIB string theory. The Type IIB descriptions are in terms of D3 branes in orientifold and generalized conifold backgrounds. We calculate the Weyl and Euler anomalies in these theories, and find that they are equal in elliptic models and unequal in a large class of finite N=2 and marginal N=1 non-elliptic theories. (author)

[en] Objective: To evaluate the demographic features, outcome and prognostic factors seen in children with acute lymphoplastic leukaemia at a tertiary care hospital. Methods: The retrospective descriptive study was conducted at Aga Khan University Hospital, Karachi, comprising data related to children below 15 years of age and treated between January 1997 and December 2006. Kaplan Meir survival curves were used to describe overall and event-free survival rates. Cox Proportional Hazards model was used to describe factors associated with death and relapse. SPSS 16 was the main statistical tool. Results: Of the total 121 children diagnosed with the condition, 79 (65.3%) were males; 86 (71.1%) patients were between 1-9 years of age; Immunophenotyping was done in 99 (81.81%) patients: 86 (87%) cases had precursor B and 13 (13.13%) had precursor T. Of the total, 106(87.6%) patients opted for treatment, while 15 (11.6%) were lost to follow-up. Besides, 26(21.7%) patients had at least one relapse; the most common site being bone marrow in 13 (50%) followed by central nervous system in 9 (36.6%). There were 20(16.5%) deaths in the sample. Infection was the most frequent cause of death. The event-free survival and overall survival was 63% (n=76) and 65% (n=79) respectively. Conclusion: Through the clinical characteristics of children with acute lymphoblastic leukamia were similar to those reported in literature, the outcomes were inferior. The high rate of infections and relapse warrant better supportive care and risk-based approach. (author)

[en] Radiolabelled dimercaptosuccinic acid (DMSA) has been utilised by several investigators as a safe and effective renal radiopharmaceutical for static 'imaging'. A review of the available literature indicates that Tc-99-DMSA is the best agent to study the renal anatomy. DMSA being very reactive, needs extra care, slight mishandling results in the change of target organ. To overcome this problem we prepared a kit which showed improved results as there was no uptake in any other viscera, and has been found to be comparable wit commercially supplied kit. (author)

[en] An experimental setup has been developed to determine hydrogen contents of bulk samples using fast neutron transmission technique. Neutrons with 3 MeV energy were produced via D(d, n) reaction. The neutrons transmitted through the sample were detected by a NE213 scintillation detector. Preliminary tests of the setup were carried out using soil samples with different moisture contents. In addition to experimental study, Monte Carlo simulations were carried out to generate calibration curve of the experimental setup. Finally, experimental tests results were compared with the results of Monte Carlo simulations. A good agreement has been obtained between the simulation results and experimental results

[en] We determine the low-energy description of N=2 supersymmetric Π_i SU(k_i) gauge theories with bifundamental and fundamental matter based on M-theory five-brane configurations. The dependence on moduli and scales of the coefficients in the nonhyperelliptic Seiberg-Witten curves for these theories are determined by considering various field theory and brane limits. A peculiarity in the interpretation of these curves for the vanishing β-function case is noted. copyright 1998 The American Physical Society

[en] It is established that immunosuppressed allograft recipients are at increased risk of developing certain types of cancers. The incidence of malignancies varies from 1% to 16% with an average of 6%. The variation of incidence may indicate differences in the intensity of immunosuppressive therapy given at various centers. The incidence also varies in different geographical regions. Kaposi's Sarcoma is more common in Arabs, Blacks Italian Jewish and Greeks. In our study of 630 patients, 12 had developed different malignancies. Six patients had Kaposi's Sarcoma, 4 had lymphoma and 2 were miscellaneous tumors, one each for adenocarcinoma of pancreas and testicular teratoma. (author)

[en] New Schiff bases, salicylidene- and pyridoxylidene-thyroxine have been prepared and characterized. They were labeled with ^99mTc. The labeling yield of the Schiff bases was over 95%. About 60% of the activity was bound to γ-globulin and albumin fractions when the labeled compounds were incubated with a serum sample. The labeled compounds, after i.v. administration to rats, rapidly cleared from blood and excreted into the small intestine. They appeared to behave as hepatobiliary agents. (author) 8 refs.; 3 figs.; 1 tab