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1.
No Shinkei Geka ; 47(9): 949-956, 2019 Sep.
Artigo em Japonês | MEDLINE | ID: mdl-31564655

RESUMO

The cognitive function of children who underwent surgical therapy after a traumatic brain injury is poorly studied. In this study, we investigated the characteristics of 27 children who received surgical therapy at our institution. The children were between 1 and 16 years of age, of which 15 had cognitive dysfunction. Their Glasgow Coma Scale score at the acute stage of dysfunction was worse than in children who did not have cognitive dysfunction. Acute subdural hematoma was more frequent in the cognitive dysfunction group. Moreover, all children in this group showed brain injury by imaging analysis. Differences in imaging characteristics and the association with cognitive dysfunction could not be readily associated with a specific injury. Memory and verbal disorder were the most common cognitive dysfunctions:these symptoms were present among children of all ages;conversely, behavior disorder, impaired attention, and infeasibility were limited to the children under 9 years of age. Since the immature brain is developing, the acquisition of new abilities may be blocked by the injury;thus, we speculate that brain injury at a younger age causes greater cognitive dysfunction.


Assuntos
Lesões Encefálicas Traumáticas , Lesões Encefálicas , Disfunção Cognitiva , Adolescente , Lesões Encefálicas Traumáticas/cirurgia , Criança , Pré-Escolar , Disfunção Cognitiva/etiologia , Escala de Coma de Glasgow , Humanos , Lactente
2.
PLoS One ; 13(12): e0208909, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30532248

RESUMO

Imaging was conducted using an electron tracking-Compton camera (ETCC), which measures γ-rays with energies in the range of 200-900 keV from 95mTc. 95mTc was produced by the 95Mo(p, n)95mTc reaction on a 95Mo-enriched target. A method for recycling 95Mo-enriched molybdenum trioxide was employed, and the recycled yield of 95Mo was 70%-90%. Images were obtained with the gate of three energies. The results showed that the spatial resolution increases with increasing γ-ray energy, and suggested that the ETCC with high-energy γ-ray emitters such as 95mTc is useful for the medical imaging of deep tissue and organs in the human body.


Assuntos
Diagnóstico por Imagem/métodos , Câmaras gama , Imagens de Fantasmas/tendências , Tecnécio/química , Algoritmos , Diagnóstico por Imagem/tendências , Elétrons , Raios gama , Humanos , Molibdênio/química , Método de Monte Carlo , Óxidos/química , Fótons , Radioisótopos/química , Espalhamento de Radiação
3.
J Am Chem Soc ; 140(44): 14609-14613, 2018 Nov 07.
Artigo em Inglês | MEDLINE | ID: mdl-30358998

RESUMO

We report the first ionization potentials (IP1) of the heavy actinides, fermium (Fm, atomic number Z = 100), mendelevium (Md, Z = 101), nobelium (No, Z = 102), and lawrencium (Lr, Z = 103), determined using a method based on a surface ionization process coupled to an online mass separation technique in an atom-at-a-time regime. The measured IP1 values agree well with those predicted by state-of-the-art relativistic calculations performed alongside the present measurements. Similar to the well-established behavior for the lanthanides, the IP1 values of the heavy actinides up to No increase with filling up the 5f orbital, while that of Lr is the lowest among the actinides. These results clearly demonstrate that the 5f orbital is fully filled at No with the [Rn]5f147s2 configuration and that Lr has a weakly bound electron outside the No core. In analogy to the lanthanide series, the present results unequivocally verify that the actinide series ends with Lr.

4.
Inorg Chem ; 52(21): 12311-3, 2013 Nov 04.
Artigo em Inglês | MEDLINE | ID: mdl-24116851

RESUMO

The reduction behavior of mendelevium (Md) was studied using a flow electrolytic chromatography apparatus. By application of the appropriate potentials on the chromatography column, the more stable Md(3+) is reduced to Md(2+). The reduction potential of the Md(3+) + e(-) → Md(2+) couple was determined to be -0.16 ± 0.05 V versus a normal hydrogen electrode.

5.
Rev Sci Instrum ; 84(2): 023304, 2013 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-23464201

RESUMO

We have developed a surface ionization ion-source as part of the JAEA-ISOL (Isotope Separator On-Line) setup, which is coupled to a He/CdI2 gas-jet transport system to determine the first ionization potential of the heaviest actinide lawrencium (Lr, Z = 103). The new ion-source is an improved version of the previous source that provided good ionization efficiencies for lanthanides. An additional filament was newly installed to give better control over its operation. We report, here, on the development of the new gas-jet coupled surface ion-source and on the first successful ionization and mass separation of 27-s (256)Lr produced in the (249)Cf + (11)B reaction.

6.
J Am Chem Soc ; 131(26): 9180-1, 2009 Jul 08.
Artigo em Inglês | MEDLINE | ID: mdl-19514720

RESUMO

We report here on the successful oxidation of element 102, nobelium (No), on an atom-at-a-time scale in 0.1 M alpha-hydroxyisobutyric acid (alpha-HIB) solution using a newly developed technique, flow electrolytic column chromatography. It is found that the most stable ion, No(2+), is oxidized to No(3+) within 3 min and that the oxidized No complex with alpha-HIB holds the trivalent state in the column above an applied potential of 1.0 V.

7.
J Am Chem Soc ; 126(16): 5219-24, 2004 Apr 28.
Artigo em Inglês | MEDLINE | ID: mdl-15099106

RESUMO

Fluoride complexation of element 104, rutherfordium (Rf), produced in the 248Cm(18O,5n)261Rf reaction has been studied by anion-exchange chromatography on an atom-at-a-time scale. The anion-exchange chromatographic behavior of Rf was investigated in 1.9-13.9 M hydrofluoric acid together with those of the group-4 elements Zr and Hf produced in the 18O-induced reactions on Ge and Gd targets, respectively. It was found that the adsorption behavior of Rf on anion-exchange resin is quite different from those of Zr and Hf, suggesting the influence of relativistic effects on the fluoride complexation of Rf.

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