4-Diphenylaminocarbazole: Switching Substituent Position for Voltage Reduction and Efficiency Enhancement of OLEDs.

Simple but exceptionally efficient 4-diphenylaminocarbazole host material, 4-DPACz, is presented and compared with its positional isomer, 1-DPACz. The shift of diphenylamino substituent from the 1-position to 4-position of carbazole resulted in an increase in the HOMO energy level as well as an increase in triplet energy level. Having a high triplet energy level (2.

A case of multiple mucosa-associated lymphoid tissue (MALT) lymphoma of the colon identified as simple mucosal discoloration.

Most colonic multiple mucosa-associated lymphoid tissue (MALT) lymphomas are confirmed with a histologic and immunohistochemical staining of the mucosal biopsy specimen obtained during colonoscopic examinations. Endoscopically, colonic MALT lymphomas frequently appear as protruding and/or ulcerative lesions, and there are not so many reports of colonic MALT lymphoma as compared to the frequent reports of MALT lymphoma of stomach. We report a unique case of colonic MALT lymphoma presenting as a simple reddish discoloration of mucosa; this presentation has never been describe before.

Unexpected bleeding caused by arterial variation inferolateral to levator palpebrae.

When incisional or nonincisional double-eyelid operations are in process, unexpected bleeding adjacent to the lateral canthal area is often encountered. The unexpected bleeding may result in intraoperative hematoma and swelling. It may also cause temporary intraoperative ptosis.