Theoretical investigation on the highest epoxygenated fullerene C36018 formed from the initial C36 fullerene with D6h symmetry has been performed at the B3LYP/6-31G（d） level. Their equilibrium structures, thermal st...Theoretical investigation on the highest epoxygenated fullerene C36018 formed from the initial C36 fullerene with D6h symmetry has been performed at the B3LYP/6-31G（d） level. Their equilibrium structures, thermal stabilities, electronic structures, vertical ionization potentials, vertical electron affinities, vibrational frequencies and 13C NMR chemical shifts have been studied. The calculation results showed that C36O18 isomers have higher LUMO-HOMO energy gaps than the fullerene C36 and should be more stable. Compared with C36, it is less possible for C36O18 to accept or donate electrons from reduced VEAs and enhanced VIPs. It has been found that C36O18 isomers are not aromatic at all or antiaromatic on analyzing the NICS values. The present study will encourage further theoretical and experimental analyses of this system in future.展开更多
BACKGROUND Only a few cases of giant pseudomeningoceles have been reported in the literature.Herein,we report a giant pseudomeningocele of the cervical spine that was found after cervical laminectomy for an epidural h...BACKGROUND Only a few cases of giant pseudomeningoceles have been reported in the literature.Herein,we report a giant pseudomeningocele of the cervical spine that was found after cervical laminectomy for an epidural hematoma following epidural blockade.CASE SUMMARY A 47-year-old man presented with recurrent neck pain and posterior neck swelling after spinal surgery.Magnetic resonance imaging of the cervical spine revealed fluid collection(5.6 cm×6.6 cm×11.2 cm)at the C3-6 level;this proved to be a pseudomeningocele.Symptoms related to the pseudomeningocele resolved following dural repair and fat graft transplantation.CONCLUSION Although rare,pseudomeningocele is a possibility in patients with recurrent back pain,radicular pain,or a persistent headache following spinal surgery.Continuous attention should be paid throughout the spinal procedure,whether conservative or non-conservative.展开更多
文摘Theoretical investigation on the highest epoxygenated fullerene C36018 formed from the initial C36 fullerene with D6h symmetry has been performed at the B3LYP/6-31G（d） level. Their equilibrium structures, thermal stabilities, electronic structures, vertical ionization potentials, vertical electron affinities, vibrational frequencies and 13C NMR chemical shifts have been studied. The calculation results showed that C36O18 isomers have higher LUMO-HOMO energy gaps than the fullerene C36 and should be more stable. Compared with C36, it is less possible for C36O18 to accept or donate electrons from reduced VEAs and enhanced VIPs. It has been found that C36O18 isomers are not aromatic at all or antiaromatic on analyzing the NICS values. The present study will encourage further theoretical and experimental analyses of this system in future.
文摘BACKGROUND Only a few cases of giant pseudomeningoceles have been reported in the literature.Herein,we report a giant pseudomeningocele of the cervical spine that was found after cervical laminectomy for an epidural hematoma following epidural blockade.CASE SUMMARY A 47-year-old man presented with recurrent neck pain and posterior neck swelling after spinal surgery.Magnetic resonance imaging of the cervical spine revealed fluid collection(5.6 cm×6.6 cm×11.2 cm)at the C3-6 level;this proved to be a pseudomeningocele.Symptoms related to the pseudomeningocele resolved following dural repair and fat graft transplantation.CONCLUSION Although rare,pseudomeningocele is a possibility in patients with recurrent back pain,radicular pain,or a persistent headache following spinal surgery.Continuous attention should be paid throughout the spinal procedure,whether conservative or non-conservative.
