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Stability of Double Tearing Mode in Current Hole Configuration
takashi Tuda,Gen-Ichi Kurita,Takaaki Fujita 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
A current profile with a strong current peak on the outside of a region with almost zero current density was observed in current hole experiments. Such a profile offers the possibility of having a good stability for double tearing modes, even where two resonant surfaces exist, because no magnetohydrodynamic activity identified for a double tearing mode was observed. We examine the stability of a double tearing mode for a current profile with a strong peak around an inner resonant surface and show that the profile is stable for a double tearing mode if the peak exists inside of the surface. This fact shows the possibility of stabilizing a double tearing mode by a localized co-drive current.
Fujita, Shigeyuki,Mizobata, Naoki,Nakanishi, Takashi,Tojyo, Itaru Korean Association of Maxillofacial Plastic and Re 2019 Maxillofacial Plastic Reconstructive Surgery Vol.41 No.-
Background: The lingual nerve plays an important role in multiple functions, including gustatory sensation and contact sensitivity and thermosensitivity. Misdiagnosed conservative treatments for serious lingual nerve (LN) injuries can induce the patient to serious mental disability. After continuous observation and critical diagnosis of the injury, in cases involving significant disruption of lingual nerve function, microneurosurgical reconstruction of the nerve is recommended. Direct anastomosis of the torn nerve ends without tension is the recommended approach. However, in cases that present significant gaps between the injured nerve ends, nerve grafts or conduits (tubes of various materials) are employed. Recently, various reconstruction materials for peripheral nerves were commercially offered especially in the USA, but the best method and material is still unclear in the world. There currently exists no conventional protocol for managing LN neurosensory deficiency in regard to optimal methods and the timing for surgical repair. In Japan, the allograft collagen nerve for peripheral nerves reconstruction was permitted in 2017, and we tried to use this allograft nerve and got a recommendable result. Case presentation: This report is a long-term abandoned torn LN reconstructed with allograft nerve induced by the lower third molar extraction. Conclusions: In early sick period, with the exact diagnosis, the LN disturbance should be managed. In a serious condition, the reconstruction with allograft nerve is one of the recommendable methods.
Takashi Takahashi,Tomohiro Fujita,Akiyoshi Shibayama,Yuzo Tsuyuki,Haruno Yoshida 대한진단검사의학회 2017 Annals of Laboratory Medicine Vol.37 No.4
Background: Streptococcus dysgalactiae subsp. equisimilis (SDSE; a β-hemolytic streptococcus of human or animal origin) infections are emerging worldwide. We evaluated the clonal distribution of complement-mediated cell lysis-like gene (sicG) among SDSE isolates from three central prefectures of Japan. Methods: Group G/C β-hemolytic streptococci were collected from three institutions from April 2014 to March 2016. Fifty-five strains (52 from humans and three from animals) were identified as SDSE on the basis of 16S rRNA sequencing data.; they were obtained from 25 sterile (blood, joint fluid, and cerebrospinal fluid) and 30 non-sterile (skin-, respiratory tract-, and genitourinary tract-origin) samples. emm genotyping, multilocus sequence typing, sicG amplification/sequencing, and random amplified polymorphic DNA (RAPD) analysis of sicG-positive strains were performed. Results: sicG was detected in 30.9% of the isolates (16 human and one canine) and the genes from the 16 human samples (blood, 10; open pus, 3; sputum, 2; throat swab, 1) and one canine sample (open pus) showed the same sequence pattern. All sicG-harboring isolates belonged to clonal complex (CC) 17, and the most prevalent emm type was stG6792 (82.4%). There was a significant association between sicG presence and the development of skin/soft tissue infections. CC17 isolates with sicG could be divided into three subtypes by RAPD analysis. Conclusions: CC17 SDSE harboring sicG might have spread into three closely-related prefectures in central Japan during 2014–2016. Clonal analysis of isolates from other areas might be needed to monitor potentially virulent strains in humans and animals.
Atlantoaxial Stabilization Using C1 and C2 Laminar Screw Fixation
Takashi Tsuji,Kazuhiro Chiba,Yosuke Horiuchi,Tadahisa Urabe,Shota Fujita,Morio Matsumoto 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.2
We describe the use of a C1 laminar screw in combination with a C2 laminar screw as a salvage technique to treat two patients, one with persistent first intersegmental artery and the other with vertebral artery occlusion after cervical spine fracture. The combined use of C1 and C2 laminar screws allows for good fixation of the atlantoaxial joint with a lower risk of vertebral artery injury; therefore, it can be an alternative surgical procedure for patients with congenital or traumatic anomalous vertebral artery.
Tomohiro Fujita,Haruno Yoshida,Shunsuke Osaka,Yoneji Hirose,Mieko Goto,Noriyuki Nagano,Takashi Takahashi 대한진단검사의학회 2019 Annals of Laboratory Medicine Vol.39 No.5
No study has described Streptococcus dysgalactiae subsp. equisimilis (SDSE) isolates that cause repetitive infections (recurrence and reinfection). We compared the microbiological characteristics of SDSE causing repetitive infections with those causing single infections. Three patients with invasive infections were identified based on their medical records, and multiple SDSE isolates were collected at intervals over three weeks, using a laboratory repository. Isolates from 12 patients with single-episode infections served as controls. Six isolates were collected from three patients with first and second episodes of infection. All isolates causing either repetitive or single-episode infection were subjected to emm typing, multilocus sequence typing (MLST), pulsed-field gel electrophoresis (PFGE), and random amplified polymorphic DNA (RAPD) analyses. Amplification of five virulence genes (sicG, prtF1, prtF2, lmb, and cbp), biofilm formation (BF), and cell invasion abilities (CIAs) were measured as virulent phenotypes. We observed close genetic similarities in the data obtained by emm typing, MLST, PFGE, and RAPD in four isolates from two patients, suggesting recurrence, whereas two isolates from one patient indicated genetic differences in these data, suggesting re-infection. The presence of the five virulence genes and the BF and CIA measurements appeared not to contribute to repetitive infections, compared with isolates causing single-episode infection. In conclusion, clinicians encountering patients with repetitive infections should be aware of both possibilities: recurrence with closely related strains and reinfection with different strains.
Shigeyuki Fujita,Itaru Tojyo,Takashi Nakanishi,Shigeru Suzuki 대한악안면성형재건외과학회 2022 Maxillofacial Plastic Reconstructive Surgery Vol.44 No.-
Background: No studies have compared the outcomes of direct perineurial suture with vein graft cuff repair andindirect collagen allograft repair of the lingual nerve following an injury. Therefore, we evaluated and compared theoutcomes of each over a 1-year observation period. We retrospectively assessed 20 patients who had undergonemicroneurosurgical repair of unilateral lingual nerve injuries at the Wakayama Medical University Hospital betweenMay 2015 and March 2019. We utilized two different methods for lingual nerve repair, i.e., direct perineurial repairwith a vein graft cuff and interpositional collagen allograft repair. Sensory and taste function in the lingual nervewere preoperatively evaluated using a static two-point discrimination test, superficial pain/tactile sensation test,tests for the pressure pain threshold (Semmens-Weinstein monofilament), test for thermal discrimination hot andcold sensation, and a taste discrimination test. These tests were performed again at 6 and 12 months postoperatively. Results: Compared to the preoperative conditions, all patients showed improved sensory reactions. Functional sensoryrecovery outcomes were defined by Pogrel’s criteria, Medical Research Council Scale grades, and functional sensoryrecovery. In each group, all patients improved after the operation. However, the operation time was significantly shorterfor an interpositional collagen allograft repair as compared to that for a direct perineurial repair with a vein graft cuff. Conclusions: There were no statistically significant differences between the two repair Methods, except for the operationtime. Both methods led to satisfactory results for all criteria. From an economic point of view, direct perineurial repair witha vein graft cuff ismeaningful; however, the esthetic effect on the donor site should be considered. Conversely,interpositional collagen allograft repair has the advantage of a greatly shortened operation time.