Gas-phase synthesis of [OU-X] (X = Cl, Br and I) from a UO precursor using ion-molecule reactions and an [OUCH] intermediate.

Difficulty in the preparation of gas-phase ions that include U in middle oxidation states(III,IV) have hampered efforts to investigate intrinsic structure, bonding and reactivity of model species. Our group has used preparative tandem mass spectrometry (PTMS) to synthesize a gas-phase U-methylidyne species, [OUCH], by elimination of CO from [UO(CCH)] [M. J.

Intrinsic reactivity of [OUCH] : Apparent synthesis of [OUS] by reaction with CS.

Rationale: Building on our report that collision-induced dissociation (CID) can be used to create the highly reactive U-alkylidyne species [O=U≡CH] , our goal was to determine whether the species could be as an intermediate for synthesis of [OUS] by reaction with carbon disulfide (CS ).

Methods: Cationic uranyl-propiolate precursor ions were generated by electrospray ionization, and multiple-stage CID in a linear trap instrument was used to prepare [O=U≡CH] . Neutral CS was admitted into the trap through a modified He inlet and precision leak valves.

Nasopharyngeal granulomatous mass after radiotherapy for nasopharyngeal carcinoma.

Objective: To evaluate the diagnosis, management and nasal endoscopic surgical outcome of nasopharyngeal granulomatous mass in post-radiation nasopharyngeal carcinoma (NPC) patients.

Materials And Methods: A total of 23 cases of granulomatous mass after radiotherapy for NPC from 2008 to 2013 treated with nasal endoscopic surgery were retrospectively reviewed.

Results: Radiotherapy dose (p=0.

Impact of different surgical and postoperative adjuvant treatment modalities on survival of sinonasal malignant melanoma.

Background: The role of postoperative adjuvant treatment for sinonasal malignant melanoma remains unclear. This study evaluates the impact of three different surgical and postoperative adjuvant treatment modalities: surgery alone(open and endoscopic approaches), surgery plus radiotherapy and surgery, radiotherapy plus chemotherapy on survival of patients with primary sinonasal malignant melanoma (SMM).

Methods: The data of 69 patients who underwent primary surgical treatments at Eye & ENT hospital of Fudan University between January 1st, 2000 and December 31st, 2010 were retrospectively reviewed.