Two-proton radioactivity and three-body decay. III. Integral formulae for decay widths in a simplified semianalytical approach

Three-body decays of resonant states are studied using integral formulae for decay widths. Theoretical approach with a simplified Hamiltonian allows semianalytical treatment of the problem. The model is applied to decays of the first excited $3/2^{-}$ state of $^{17}$Ne and the $3/2^{-}$ ground state of $^{45}$Fe. The convergence of three-body hyperspherical model calculations to the exact result for widths and energy distributions are studied. The theoretical results for $^{17}$Ne and $^{45}$Fe decays are updated and uncertainties of the derived values are discussed in detail. Correlations for the decay of $^{17}$Ne $3/2^-$ state are also studied.Comment: 19 pages, 20 figure

Proton Decay from Excited States in Spherical Nuclei

Based on a single particle model which describes the time evolution of the wave function during tunneling across a one dimensional potential barrier we study the proton decay of $^{208}$Pb from excited states with non-vanishing angular momentum $\ell$. Several quantities of interest in this process like the decay rate $\lambda$, the period of oscillation $T_{osc}$, the transient time $t_{tr}$, the tunneling time $t_{tun}$ and the average value of the proton packet position $r_{av}$ are computed and compared with the WKB results.Comment: 12 pages, 4 figure

Decay Rate of Triaxially-Deformed Proton Emitters

The decay rate of a triaxially-deformed proton emitter is calculated in a particle-rotor model, which is based on a deformed Woods-Saxon potential and includes a deformed spin-orbit interaction. The wave function of the $I=7/2^{-}$ ground state of the deformed proton emitter $^{141}$Ho is obtained in the adiabatic limit, and a Green's function technique is used to calculate the decay rate and branching ratio to the first excited 2$^{+}$ state of the daughter nucleus. Only for values of the triaxial angle $\gamma$ $<5^{\circ}$ is good agreement obtained for both the total decay rate and the 2$^{+}$ branching ratio.Comment: 19 pages, 4 figure

Time-dependent properties of proton decay from crossing single-particle metastable states in deformed nuclei

A dynamical study of the decay of a metastable state by quantum tunneling through an anisotropic, non separable, two-dimensional potential barrier is performed by the numerical solution of the time-dependent Schrodinger equation. Initial quasi- stationary proton states are chosen in the framework of a deformed Woods-Saxon single-particle model. The decay of two sets of states corresponding to true and quasi levels-crossing is studied and the evolution of their decay properties as a function of nuclear deformation is calculated around the crossing point. The results show that the investigation of the proton decay from metastable states in deformed nuclei can unambiguously distinguish between the two types of crossing and determine the structure of the nuclear states involved.Comment: 15 pages, 9 figures, submitted to Phys. Rev.

Comparative cytogenetic analysis of two grasshopper species of the tribe Abracrini (Ommatolampinae, Acrididae)

The grasshopper species Orthoscapheus rufipes and Eujivarus fusiformis were analyzed using several cytogenetic techniques. The karyotype of O. rufipes, described here for the first time, had a diploid number of 2n = 23, whereas E. fusiformis had a karyotype with 2n = 21. The two species showed the same mechanism of sex determination (XO type) but differed in chromosome morphology. Pericentromeric blocks of constitutive heterochromatin (CH) were detected in the chromosome complement of both species. CMA3/DA/DAPI staining revealed CMA3-positive blocks in CH regions in four autosomal bivalents of O. rufipes and in two of E. fusiformis. The location of active NORs differed between the two species, occurring in bivalents M6 and S9 of O. rufipes and M6 and M7 of E. fusiformsi. The rDNA sites revealed by FISH coincided with the number and position of the active NORs detected by AgNO3 staining. The variability in chromosomal markers accounted for the karyotype differentiation observed in the tribe Abracrini

УРОВЕНЬ sCD30 ПРИ ТРАНСПЛАНТАЦИИ ПЕЧЕНИ ДЕТЯМ С ВРОЖДЕННЫМИ И НАСЛЕДСТВЕННЫМИ ЗАБОЛЕВАНИЯМИ ПЕЧЕНИ И ЖЕЛЧЕВЫВОДЯЩИХ ПУТЕЙ

Soluble CD30 (sCD30) is a marker of T-lymphocytes activation and is used for monitoring rejection in patients after heart, lung and renal transplantation. The aim of the study was to evaluate plasma levels of sCD30 in child- ren before and after living-donor liver transplantation (LDLT) and its relationship with the postoperative course. The study included 72 children with end-stage liver disease (ESLD), aged 17 ± 11 (4–28) months before and after LDLT, 15 healthy children aged 9.9 ± 5.7 (3–21) months and 38 adult living-related liver donors, aged 37 ± 19 (18–56) years. In children with ESLD pre-transplant plasma level of sCD30 (84,9 ± 43,8 ng/ml) was significantly higher than in healthy donors and healthy children (26.4 ± 12.0 and 32.6 ± 6.9 ng/ml, resp., p &lt; 0.01). After LDLT plasma level of sCD30 was higher in children, who had graft dysfunction at days 28–32 (108.9 ± 17.7 ng/ml) after LDLT than in children who had no graft dysfunction (40.2 ± 5.3 ng/ml, р &lt; 0.01). In patients with graft dysfunction elevation of sCD30 concentration was observed before 2–5 days increasing of liver enzyme activity. The measurement of sCD30 concentration may be useful for monitoring of the postoperative course. Растворимая форма CD30 (sCD30) является маркером активации Т-лимфоцитов, а измерение его уров- ня в плазме крови используется для мониторинга острого отторжения после трансплантации сердца, лег- кого и почки. Изучено содержание sCD30 в плазме крови детей до и после родственной трансплантации фрагмента печени и связь его динамики с течением послеоперационного периода. В исследование включено 72 ребенка с терминальной стадией заболеваний печени в возрасте 17 ± 11 (4–28) месяцев, 15 здоровых детей в возрасте 9,9 ± 5,7 (3–21) и 38 доноров фрагмента печени в возрасте 37 ± 19 (18–56) лет. Уровень sCD30 у детей до трансплантации (84,9 ± 43,8 нг/мл) был значительно выше, чем у доноров и здоровых детей (26,4 ± 12,0 и 32,6 ± 6,9 нг/мл соответственно, р &lt; 0,01). Уровень sCD30 в плазме крови реципиентов с клиническими и биохимическими признаками дисфункции транспланта- та, развившейся на 28–32-е сутки после трансплантации (108,9 ± 17,7 нг/мл), был выше, чем у реципи- ентов без осложнений (40,2 ± 5,3 нг/мл, p &lt; 0,01). У всех реципиентов с дисфункцией трансплантата по- вышение уровня sCD30 обнаружено за 2–5 дней до появления роста активности ферментов печени. Из- мерение концентрации sCD30 у реципиентов печени целесообразно для мониторинга течения посттран- сплантационного периода.

Delimiting the Origin of a B Chromosome by FISH Mapping, Chromosome Painting and DNA Sequence Analysis in Astyanax paranae (Teleostei, Characiformes)

Supernumerary (B) chromosomes have been shown to contain a wide variety of repetitive sequences. For this reason, fluorescent in situ hybridisation (FISH) is a useful tool for ascertaining the origin of these genomic elements, especially when combined with painting from microdissected B chromosomes. In order to investigate the origin of B chromosomes in the fish species Astyanax paranae, these two approaches were used along with PCR amplification of specific DNA sequences obtained from the B chromosomes and its comparison with those residing in the A chromosomes. Remarkably, chromosome painting with the one-arm metacentric B chromosome probe showed hybridization signals on entire B chromosome, while FISH mapping revealed the presence of H1 histone and 18S rDNA genes symmetrically placed in both arms of the B chromosome. These results support the hypothesis that the B chromosome of A. paranae is an isochromosome. Additionally, the chromosome pairs Nos. 2 or 23 are considered the possible B chromosome ancestors since both contain syntenic H1 and 18S rRNA sequences. The analysis of DNA sequence fragments of the histone and rRNA genes obtained from the microdissected B chromosomes showed high similarity with those obtained from 0B individuals, which supports the intraspecific origin of B chromosomes in A. paranae. Finally, the population hereby analysed showed a female-biased B chromosome presence suggesting that B chromosomes in this species could influence sex determinism.This research was funded by grants from the State of São Paulo Research Foundation (FAPESP) to DMZAS (2011/16825-3) and CO (2010/17009-2), grants from National Council for Research and Development (CNPq) to FF and by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)