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51.
Munshi G Mustafa Sudhir Raniwala T Awes B Rai RS Bhalerao JG Contreras RV Gavai SK Ghosh P Jaikumar GC Mishra AP Mishra H Mishra B Mohanty J Nayak J-Y Ollitrault SC Phatak L Ramello R Ray PK Sahu AM Srivastava DK Srivastava VK Tiwari 《Pramana》2006,67(5):961-981
This is the report of Heavy Ion Physics and Quark-Gluon Plasma at WHEPP-09 which was part of Working Group-4. Discussion and
work on some aspects of quark-gluon plasma believed to have created in heavy-ion collisions and in early Universe are reported. 相似文献
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Determination of metallic impurities in U3O8 using energy dispersive X-ray fluorescence spectrometry
V. Natarajan B.A. DhawaleB. Rajeswari N.S. HonS.K. Thulasidas N.K. PorwalS.V. Godbole V.K. Manchanda 《Spectrochimica Acta Part B: Atomic Spectroscopy》2008
In order to examine the capability of energy dispersive X-ray fluorescence spectrometry for the determination of some common metallic impurities in nuclear grade U3O8 matrix, a series of synthetic U3O8 standards, containing impurities such as Ca, Co, Cr, Cu, Fe, Mn, Mo, Ni ,V, W and Zn in the concentration range, 100–1000 μg/g, were prepared. Using these standards, calibration curves were set up for different elements after optimizing the spectrometer parameters. Two synthetic samples and five reference standards obtained through an inter-laboratory comparison exercise within analytical laboratories of Department of Atomic Energy, India were analyzed to evaluate the performance of the newly developed analytical methods. The estimates for most of the analytes were in good agreement with the added amounts. The method is fast, since it requires no chemical treatment. The method has good precision for the analytes determined. 相似文献
54.
The separation of trivalent actinides and lanthanides is a challenging task for chemists because of their similar charge and chemical behavior. Soft donor ligands like Cyanex-301 were found to be selective for the trivalent actinides over the lanthanides. Formation of different extractable species for Am(3+) and various lanthanides (viz. La(3+), Eu(3+), and Lu(3+)) was explained on the basis of their relative stabilities as compared to their corresponding trinitrato complexes calculated using the density functional method. Further, the metal-ligand complexation energy was segregated into electrostatic, Pauli repulsion, and orbital interaction components. Higher covalence in the M-S bond in the dithiophosphinate complexes as compared to the M-O bond in the nitrate complexes was reflected in the higher orbital and lower electrostatic interactions for the complexes with increasing number of dithiophosphinate ligands. Higher affinity of the dithiophosphinate ligands for Am(3+) over Eu(3+) was corroborated with higher covalence in the Am-S bond as compared to the Eu-S bond, which was reflected in shorter bond length in the case of the former and higher ligand to metal charge transfer in Am(III)-dithiophosphinate complexes. The results were found to be consistent in gas phase density functional theory (DFT) calculations using different GGA functional. More negative complexation energies in the case of Eu(3+) complexes of Me(2)PS(2)(-) as compared to the corresponding Am(3+) complexes in spite of marginally higher covalence in the Am-S bond as compared to the Eu-S bond might be due to higher ionic interaction in the Eu(3+) complexes in the gas phase calculations. The higher covalence in the Am-S bond obtained from the gas phase studies of their geometries and electronic structures solely cannot explain the selectivity of the dithiophosphinate ligands for Am(3+) over Eu(3+). Presence of solvent may also play an important role to control the selectivity as observed from higher complexation energies for Am(3+) in the presence of solvent. Thus, the theoretical results were able to explain the experimentally observed trends in the metal-ligand complexation affinity. 相似文献
55.
H. Naik V.T. Nimje D. Raj S.V. Suryanarayana A. Goswami Sarbjit Singh S.N. Acharya K.C. Mittal S. Ganesan P. Chandrachoodan V.K. Manchanda V. Venugopal S. Banarjee 《Nuclear Physics A》2011
The yields of various fission products in the 10 MeV bremsstrahlung-induced fission of 232Th, 238U and 240Pu were determined using a recoil catcher and off-line γ-ray spectrometric techniques. From the yield data, mass yield distributions were obtained using charge distribution corrections. The higher yields of fission products around mass numbers 133–135, 138–140, 143–145 and their complementary products in the neutron and bremsstrahlung-induced fission of 232Th, 238U and 240Pu were interpreted based on nuclear structure effects. From the mass yield distribution, the peak-to-valley (P/V) ratio was also obtained for the above fissioning systems. The present data, along with data from the literature on different bremsstrahlung- and mono-energetic neutron-induced fissions of 232Th and 238U are interpreted to examine the influence of excitation energy on the peak to valley ratio. For the same compound nucleus 240Pu?, the data in the 10–30 MeV bremsstrahlung-induced fission of 240Pu were compared with similar data of thermal to 14 MeV neutron-induced fission of 239Pu and the spontaneous fission of 240Pu to examine the role of excitation energy due to bremsstrahlung radiation and mono-energetic neutrons. 相似文献
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Priya Prakash Krupal P. Jethava Nils Korte Pablo Izquierdo Emilia Favuzzi Indigo V. L. Rose Kevin A. Guttenplan Palak Manchanda Sayan Dutta Jean-Christophe Rochet Gord Fishell Shane A. Liddelow David Attwell Gaurav Chopra 《Chemical science》2021,12(32):10901
Phagocytosis by glial cells is essential to regulate brain function during health and disease. Therapies for Alzheimer''s disease (AD) have primarily focused on targeting antibodies to amyloid β (Aβ) or inhibitng enzymes that make it, and while removal of Aβ by phagocytosis is protective early in AD it remains poorly understood. Impaired phagocytic function of glial cells during later stages of AD likely contributes to worsened disease outcome, but the underlying mechanisms of how this occurs remain unknown. We have developed a human Aβ1–42 analogue (AβpH) that exhibits green fluorescence upon internalization into the acidic organelles of cells but is non-fluorescent at physiological pH. This allowed us to image, for the first time, glial uptake of AβpH in real time in live animals. We find that microglia phagocytose more AβpH than astrocytes in culture, in brain slices and in vivo. AβpH can be used to investigate the phagocytic mechanisms responsible for removing Aβ from the extracellular space, and thus could become a useful tool to study Aβ clearance at different stages of AD.Glial cell phagocytosis of pH-dependent amyloid-β, AβpH, in live and fixed cultures, brain tissue sections, retina, cortex and in live animals useful for studying function in health and disease. 相似文献
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S. A. Ansari M. S. Murali P. N. Pathak V. K. Manchanda 《Journal of Radioanalytical and Nuclear Chemistry》2004,262(2):469-472
We describe an analytical procedure with the use of inductively coupled plasma optical emission spectrometry (ICP-OES) for the determination of about 20 elements in solutions of 177LuCl3 following the dissolution of the irradiated lutetium nitrate or oxide. The aliquots containing amounts of lutetium ranging from 1 to 100 µg in 1 ml volume were analyzed. It corresponded to the activity of 177Lu ranging from 5 to 100 mCi. The detection limits of the elements concerned were in the range of 1 to 100 ng·ml–1. The activity of 177Lu and other radionuclides was measured using a high-resolution gamma ray spectrometer. The developed procedures are to be used for routine quality control of 177Lu produced for synthesis of radiopharmaceuticals.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献