RESUMO
The basal plane of graphene has been known to be less reactive than the edges, but some studies observed vacancies in the basal plane after reaction with oxygen gas. Observation of these vacancies has typically been limited to nanometer-scale resolution using microscopic techniques. This work demonstrates the introduction and observation of subnanometer vacancies in the basal plane of graphene by heat treatment in a flow of oxygen gas at low temperature such as 533 K or lower. High-resolution transmission electron microscopy was used to directly observe vacancy structures, which were compared with image simulations. These proposed structures contain CâO, pyran-like ether, and lactone-like groups.
RESUMO
OBJECTIVE: To describe the hysteroscopic resection of a large atypical polypoid adenomyoma (APA) in a young patient followed by a successful pregnancy. DESIGN: Case report. SETTING: Department of Obstetrics and Gynecology, Niigata University Medical and Dental Hospital, Niigata, Japan. PATIENT(S): A 29-year-old female who had an endocervical tumor 4 cm in size and a diagnosis of APA. INTERVENTION(S): Conservative hysteroscopic resection of the lesion. MAIN OUTCOME MEASURE(S): Disease and pregnancy outcome. RESULT(S): The lesion was completely resected by a pathologically guided, hysteroscopic surgery. The patient spontaneously became pregnant and gave birth by vaginal delivery and is free from disease 3 years after the surgery. CONCLUSION(S): Conservative hysteroscopic surgery may be a good treatment option for APA in patients who wish to preserve their fertility, even for patients with a large lesion.
