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1.
Phys Chem Chem Phys ; 21(18): 9352-9356, 2019 May 08.
Artigo em Inglês | MEDLINE | ID: mdl-30994658

RESUMO

How can radioactive Cs+ ions be removed from aqueous solution? From this perspective, the adsorption of Cs+ was investigated by using five types of clay minerals possessing different charge exchange capacities. The fixation ability for Cs+ depended on the charge exchange capacity of the clay minerals. Phlogopite and vermiculite, where the number of charges is almost equal to half the number of siloxane ditrigonal cavities in the structure, exhibited a strong Cs+ fixation ability among these clay minerals. In these clay minerals, effective interlayer collapse, which leads to quasi-irreversible adsorption of Cs+, is expected from the introduction of Cs+ into the layer space. This is named the "cavity-charge matching effect". This study clarifies why only phlogopite and vermiculite can fix Cs+ quite strongly among various types of clay minerals. These findings are beneficial for removing radioactive Cs+ ions from the environment using clay minerals through the cavity-charge matching effect.

2.
Eur Spine J ; 17 Suppl 2: S263-6, 2008 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-17987326

RESUMO

We present an extremely rare case of traumatic spinal cord herniation due to a brachial plexus avulsion injury and provide a review of the literature of spinal cord herniation. Spinal cord herniation is an uncommon condition that can occur spontaneously or as a result of surgery or trauma. This condition often presents with symptoms and signs as Brown-Séquard syndrome. Traumatic pseudomeningoceles after a brachial plexus avulsion injury have been reported. But transdural herniation of the spinal cord into this pseudomeningocele is an extremely rare and poorly documented condition. There is only two reports of this condition in a thoracic case. The authors report the case of a 22-year-old man presented with a 2-year history of quadriplegia. He was involved in a motorcycle accident, 3 years prior to his presentation. Four years after the initial right brachial plexus injury, he was not able to walk independently. Magnetic resonance imaging (MRI) and computerized tomography (CT) myelography revealed a lateral pseudomeningocele arising from the right C6-7 and C7-T1 intervetebral foramen and cervical spinal cord herniation into this pseudomeningocele. The patient underwent primary closure of pseudomeningocele to prevent spinal cord reherniation. He can walk with cane and use left arm unrestrictedly at the 2-year follow-up examination. Spinal cord herniation following traumatic nerve root avulsion is extremely rare but it should be considered in the differential diagnosis of patients presenting with delayed myelopathy or Brown-Séquard syndrome.


Assuntos
Neuropatias do Plexo Braquial/complicações , Hérnia/complicações , Meningocele/complicações , Quadriplegia/etiologia , Doenças da Medula Espinal/etiologia , Acidentes de Trânsito , Plexo Braquial/lesões , Plexo Braquial/patologia , Plexo Braquial/fisiopatologia , Neuropatias do Plexo Braquial/patologia , Neuropatias do Plexo Braquial/fisiopatologia , Síndrome de Brown-Séquard/etiologia , Síndrome de Brown-Séquard/patologia , Síndrome de Brown-Séquard/fisiopatologia , Vértebras Cervicais/diagnóstico por imagem , Vértebras Cervicais/patologia , Vértebras Cervicais/cirurgia , Descompressão Cirúrgica , Progressão da Doença , Dura-Máter/diagnóstico por imagem , Dura-Máter/lesões , Dura-Máter/patologia , Espaço Epidural/diagnóstico por imagem , Espaço Epidural/lesões , Espaço Epidural/patologia , Hérnia/patologia , Hérnia/fisiopatologia , Humanos , Imageamento por Ressonância Magnética , Masculino , Meningocele/patologia , Meningocele/fisiopatologia , Motocicletas , Procedimentos Neurocirúrgicos , Quadriplegia/patologia , Quadriplegia/fisiopatologia , Canal Medular/diagnóstico por imagem , Canal Medular/lesões , Canal Medular/patologia , Doenças da Medula Espinal/patologia , Doenças da Medula Espinal/fisiopatologia , Raízes Nervosas Espinhais/lesões , Raízes Nervosas Espinhais/patologia , Raízes Nervosas Espinhais/fisiopatologia , Tomografia Computadorizada por Raios X , Resultado do Tratamento , Adulto Jovem
3.
Masui ; 53(9): 1047-50, 2004 Sep.
Artigo em Japonês | MEDLINE | ID: mdl-15500110

RESUMO

We report a case of epidural hematoma after a single epidural block. The patient was a 67-year-old woman with sciatica and osteoarthritis of the spine. She had no coagulopathy. She underwent a single epidural block without difficulty 3 times in 5 days. She had a lumbar MRI for an examination of the spine 4 days after the final epidural block. Subacute epidural hematoma of 0.8 x 1.5 x 3.0 cm was revealed on MRI at L 3-4. She had no new neurological symptoms. MRI 1 month later revealed a resolution of the hematoma. Epidural hematoma after an epidural block might occur in an outpatient with no bleeding tendency.


Assuntos
Analgesia Epidural/efeitos adversos , Hematoma Epidural Craniano/etiologia , Doença Aguda , Idoso , Transtornos da Coagulação Sanguínea , Feminino , Hematoma Epidural Craniano/diagnóstico , Hematoma Epidural Craniano/patologia , Humanos , Imageamento por Ressonância Magnética , Remissão Espontânea
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