[en] Insuline incubation media of normal human erythrocytes after 20 hours at 37⁰C a factor is demonstrable which inhibits ⁵⁹iron incorporation into mouse erythrocytes, as well as ³H-thymidine incorporation into fetal mouse erythroblasts in vitro. Ultrafiltration of this erythropoiesis-inhibiting factor (EIF) showed a molecular weight of less than 10,000 dalton. After gel filtration (Sephadex G 50) the maximum activity of the EIF was found in the fractions which eluted closely before vitamin B 12 (1250 dalton), indicating a similar molecular weight. The EIF is heat stable (100⁰C, 10 min.) and seems to be a peptide. The inhibiting activity, measured by thymidine incorporation, is strong against mouse erythroblasts and lacking against lymphatic cells. A weak inhibition - possibly a toxic effect - on myelopoiesis cannot be excluded. The inhibition of mouse erythroblasts is reversible. In serum of normal subjects EIF was not demonstrable, whereas it was found in normal urine, indicating rapid renal elimination. This EIF, which is demonstrable under physiological circumstances, is suggested to be the erythrocytic chalone and furthermore could play a role in the production of anaemia in terminal renal failure. (author)

No abstract available

No abstract available

[en] Gamma decays from excited states in the T_z=-1/2 nucleus ⁵¹Fe have been observed for the first time. The differences in excitation energies as compared with those of the mirror partner, ⁵¹Mn, have been interpreted in terms of Coulomb effects and the resulting Coulomb energy differences (CED) can be understood intuitively in terms of particle-alignment effects. A new CED effect has been observed, in which different CED trends have been measured for each signature of the rotational structures that characterize these mid-f_7/2 shell nuclei. Large-scale fp-shell model calculations have been used to compute the trends of the CED as a function of spin. The result of comparing these calculations with the data demonstrates an ability to reproduce the fine details of the Coulomb effects with a precision far greater than has been previously achieved

[en] The mirror beta decays of ⁵¹Fe (Jsup(π), T = 5/2^-, 1/2) and ⁵⁵Ni (Nsup(π), T = 7/2^-, 1/2) have been studied with the ion guide isotope separator on-line-system. The measured half-lives of 310 +- 5 ms for ⁵¹Fe and 208 +- 5 ms for ⁵⁵Ni differ significantly from previously reported values. In the case of ⁵¹Fe, an allowed decay branch with a (5.0 +- 1.3)% intensity to the 7/2sup(s)tate at 237 keV in ⁵¹Mn was observed. The deduced Gamow-Teller matrix elements are compared with values calculated using the empirical (fsub(7/2))sup(n) shell model. (orig.)

[en] We summarize the current status of a program to develop an angular momentum-conserving variant of the Density Matrix Renormalization Group method into a practical truncation strategy for large-scale shell model calculations of atomic nuclei. Following a brief description of the method, we report the results of systematic test calculations for both even-even and odd-mass nuclei in the 2p-1f shell. In all, the nucleons are limited to the orbitals of the 2p-1f shell and interact via the GXPF1A interaction. The calculations systematically converge to the exact diagonalization results, where available. Most importantly, the fraction of the complete space required to achieve a high level of agreement is found to go down rapidly as the size of the full space grows. (authors)

[en] Direct mass measurements of ⁷⁸Kr projectile fragments have been performed in the recently commissioned storage ring CSRe employing the isochronous mass spectrometry method. A new data-analysis technique has been developed to correct the drifts in the revolution frequencies caused by instabilities of the magnetic fields in the CSRe, thus yielding a mass resolving power of R=m/Δm∼1.7x10⁵ (sigma). Masses for ⁴⁵V, ⁴⁷Cr, ⁴⁹Mn and ⁵¹Fe nuclei are determined with a relative mass precision of δm/m∼2x10^-7 (sigma) which is an improvement by a factor of ∼2 compared to the literature values.

[en] This thesis presents the research performed within two different research groups using heavy-ion induced nuclear reactions. They offer the opportunity to investigate different properties of nuclear matter. The results are based on measurements using a variety of different experimental techniques. The PHENIX experiment measured the production of deuteron and anti-deuterons at mid-rapidity in gold-gold collisions at the Relativistic Heavy-Ion Collider, RHIC. The invariant yields and transverse momentum spectra are presented. The results are not in agreement with a simple coalescence model with a constant coalescence parameter. Excited states of atomic nuclei were populated using fusion-evaporation reactions. The emitted gamma rays were detected in large multi-detector arrays. One experiment was in conjunction with a plunger device. Lifetimes of analogue states in the A=51 mirror nuclei ⁵¹Fe and ⁵¹Mn were measured using the recoil distance Doppler shift (RDDS) technique. The deduced B(E2) values make possible an investigation of isoscalar and isovector polarization charges. A comparison between the experimental results and large-scale shell-model calculations yields a quantitative estimate of the effective nucleon charges in the fp-shell

[en] Typically, LiFePO₄ batteries (LFPBs) contain a shell, cathode mixture materials, anode mixture materials, current collector, electrolyte, separator, and other components. Cathode mixture materials are composed of a binder, conductive additive, and LiFePO₄/C. After LFPBs are scrapped, their appropriate disposal is necessary to avoid pollution. This study investigated the recovery of Li, Fe, and P by hydrometallurgy from scrapped LFPBs. To remove the binder, conductive additive, and carbon coating layer, recycled cathode mixture materials are oxidized to Li₃Fe₂(PO₄)₃ and Fe₂O₃ at 600 °C. Using H₃PO₄ as a leaching agent, the optimal leaching efficiencies, i.e., 99.2% and 97.68% for Li and Fe, respectively, can be achieved when the reaction time, temperature, Li in the Li₃Fe₂(PO₄)₃ and Fe₂O₃ mixture materials to the H₃PO₄ molar ratio (L/P ratio), and H₃PO₄ concentration are 12 h, 95 °C, 1:5, and 0.5 mol/L, respectively. Moreover, Li can be leached into a solution efficiently and recovered as LiH₂PO₄, while Fe and P can be selectively precipitated as FePO₄·xH₂O. FePO₄ is prepared by a heat treatment. Furthermore, LiFePO₄/C is re-synthesized by FePO₄, LiH₂PO₄, Fe₂O₃, LiOH, and sucrose.

[en] Nuclear structure data available through August 1977 are compiled, and adopted level properties are given. The bulk of the data is presented pictorially for easy comparison. Experimental details, references, and additional comments, where required, are given in the text. All drawings, tables, and comments are reproduced from the computerized Evaluated Nuclear Structure Data File (ENSDF). Any additions or corrections desired by the users should be addressed to the compilers for maintenance and updating of the computer file