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- 저자 : Tolga Atay (검색결과 2 건)
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Distinctive Characteristic Features of Intramedullary Hemangiopericytomas
Cezmi Çağrı Türk,Niyazi Nefi Kara,Dinç Süren,Çağatay Özdöl,Tolga Gediz,Sevim Yıldız3 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.4
Study Design: The retrospective analysis of intramedullary hemangiopericytomas (HPCs) was performed, and the entity was discussed in accordance with the literature findings. Purpose: This study aimed at defining distinctive characteristic features of intramedullary HPC with respect to surgical approach and prognosis. Overview of Literature: Intramedullary HPCs are extremely rare tumors. They originate from capillary pericytes, supposedly follow the vessels over the spinal cord, and infiltrate deep into the spinal cord without a distinct plane. Their treatments and prognosis are not well-defined in the literature. Methods: Our database was retrospectively reviewed for the cases of HPCs. Later on, a literature search was performed to reveal all reported cases of intramedullary HPCs. The following key words were searched in PubMed databases: “hemangiopericytoma and intramedullary,” “hemangiopericytoma and spine (spinal) and intradural,” and “hemangiopericytoma and spinal cord.” The articles were reviewed for patients’ demographics features, imaging characteristics, tumor-specific factors (surgical technique, pathological descriptions, and world health organization grades), and postoperative course and prognosis (adjuvant therapies, recurrences, complications, and mortalities). Results: A total of seven patients (three male and four female) was reached, with their ages ranging from 15 to 80 years (mean, 32.5 years). The tumors were located majorly in thoracic region (5/7, 71.4%), and only two cases were in the cervical region (2/7, 28.6%). All tumors were completely removed, and only two cases received radiotherapy. No recurrence was reported. Conclusions: Complete resection of the intramedullary HPCs seems to be the best management strategy for long-term and recurrence- free survival and in alleviating further need for radiotherapy.
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Observation of Plasmon Hybridization in Gold Nanoparticle Pairs
송정훈,Arto V. Nurmikko,이기원,Sa-Yong Hong,Tolga Atay,Yong-Gi Kim,Young-You Kim 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.3
The hybridization of an individual plasmon in gold nanoparticle dimers was observed. By varying the interparticle separation within the metallic nanoparticle on a nanometer scale, we observed a renormalization, as well as a splitting, of the surface plasmon energy. The distinct hybridization and splitting of the individual plasmon mode were detectable in dimer plasmons when the edge-to-edge separation was smaller than $\sim$13 nm in gold particle pairs with a diameter of 160 nm, and a height of 40 nm for each particle. The range of the interparticle separation where the hybridization was detectable was sensitive to each particle's aspect ratio and size. An initial study of the ultrafast nonlinear optical response of exciton-plasmon coupled system is also reported. We observed an enhancement of the transient nonlinear transmission of Frenkel excitons in an organic semiconductor, cyanine J-aggregate, resonantly coupled with surface plasmons in gold metallic particle arrays.
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