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Takei Mari,Nin Charles,Iizuka Tomona,Pawlikowski Marine,Selva Marie-Ange,Chantran Yannick,Nakajima Yurie,Zheng Jingkang,Aizawa Tomoyasu,Ebisawa Motohiro,Sénéchal Hélène,Poncet Pascal 대한천식알레르기학회 2022 Allergy, Asthma & Immunology Research Vol.14 No.3
The Capsicum genus belongs to the Solanaceae family. Bell or chili peppers are consumed worldwide, but allergy to Capsicum is rare. It is involved in the celery-birch-mugwort-spice syndrome and cross-reactivities were reported with latex. Several allergens have been described, but only 2 are referenced in the World Health Organization/International Union of Immunological Societies allergen data bank, a thaumatin-like protein and a profilin. A patient allergic to bell/chili pepper, peach, orange and Japanese cedar pollen was clinically and biologically analyzed including direct and competitive immunoblots and basophil activation tests (BATs) with allergenic source extracts and recombinant gibberellin-regulated proteins (GRPs). The patient was shown to be sensitized to Cap a 7, the GRP of Capsicum annuum newly described herein. Cross-reactivities were demonstrated between various GRPs from bell/chili pepper, peach, orange and Japanese cedar pollen either in native form in the different extracts or as recombinant allergens. A similar immunoglobulin E reactivity was found also in Capsicum chinense and against snakin-1, the GRP from potato. The patient showed a positive BAT with recombinant Cry j 7, Pru p 7 and Cap a 7, but not with recombinant snakin-1. Despite the ubiquitous nature of GRPs in plants and the immunochemical cross-reactivity observed between different GRPs, clinically relevant sensitization to this protein family seems restricted to some allergenic sources, often associated with Cupressaceae pollen allergy, and to some patients, therefore reflecting very specific and peculiar mechanisms of conditional sensitization.
Structural, chemical and electronic differences between bare and nitrogen‑doped carbon nanoparticles
H. L. Lee,K. L. Woon,S. Tan,W. S. Wong,A. Ariffin,N. Chanlek,H. Nakajima,T. Saisopa,P. Songsiriritthigul 한국탄소학회 2019 Carbon Letters Vol.29 No.3
Comparisons between bare carbon (CPs) and nitrogen-doped carbon nanoparticles (N-CPs) synthesised using hydrothermal reaction are carried out. It was found that hydrothermal reaction of citric acid yields graphene-like sheets, while the nitrogen doping using ethylenediamine resulted in amorphous polymeric ball-like hydrocarbons devoid of any aromatic rings. Although the Fourier transform infrared spectroscopy, Raman spectroscopy and nuclear magnetic resonance spectroscopy indicate the presence of carbon–carbon double bonds (C=C), and the ground states of both materials are very deep (> 7.8 eV) as measured by ultraviolet photoelectron spectroscopy. This indicates the conjugation is very short. This is supported by the fact that both materials are UV blue emitting peaking at 375 nm probably originating from C=C.
Structural, chemical and electronic differences between bare and nitrogen-doped carbon nanoparticles
Lee H. L.,Woon K. L.,Tan Shau Hwai,Wong W. S.,Ariffin A.,Chanlek N.,Nakajima H.,Saisopa T.,Songsiriritthigul P. 한국탄소학회 2019 Carbon Letters Vol.29 No.3
Comparisons between bare carbon (CPs) and nitrogen-doped carbon nanoparticles (N-CPs) synthesised using hydrothermal reaction are carried out. It was found that hydrothermal reaction of citric acid yields graphene-like sheets, while the nitrogen doping using ethylenediamine resulted in amorphous polymeric ball-like hydrocarbons devoid of any aromatic rings. Although the Fourier transform infrared spectroscopy, Raman spectroscopy and nuclear magnetic resonance spectroscopy indicate the presence of carbon–carbon double bonds (C=C), and the ground states of both materials are very deep (> 7.8 eV) as measured by ultraviolet photoelectron spectroscopy. This indicates the conjugation is very short. This is supported by the fact that both materials are UV blue emitting peaking at 375 nm probably originating from C=C.
Inhibitory Basal Ganglia Inputs Induce Excitatory Motor Signals in the Thalamus
Kim, J.,Kim, Y.,Nakajima, R.,Shin, A.,Jeong, M.,Park, A.H.,Jeong, Y.,Jo, S.,Yang, S.,Park, H.,Cho, S.H.,Cho, K.H.,Shim, I.,Chung, J.H.,Paik, S.B.,Augustine, G.J.,Kim, D. Cell Press 2017 Neuron Vol.95 No.5
<P>Basal ganglia (BG) circuits orchestrate complex motor behaviors predominantly via inhibitory synaptic outputs. Although these inhibitory BG outputs are known to reduce the excitability of postsynaptic target neurons, precisely how this change impairs motor performance remains poorly understood. Here, we show that optogenetic photostimulation of inhibitory BG inputs from the globus pallidus induces a surge of action potentials in the ventrolateral thalamic (VL) neurons and muscle contractions during the post-inhibitory period. Reduction of the neuronal population with this post-inhibitory rebound firing by knockout of T-type Ca2+ channels or photoinhibition abolishes multiple motor responses induced by the inhibitory BG input. In a low dopamine state, the number of VL neurons showing post-inhibitory firing increases, while reducing the number of active VL neurons via photoinhibition of BG input, effectively prevents Parkinson disease (PD)-like motor symptoms. Thus, BG inhibitory input generates excitatory motor signals in the thalamus and, in excess, promotes PD-like motor abnormalities.</P>
Nakajima, K.,Yin, X.,Takei, Y.,Seog, D.H.,Homma, N.,Hirokawa, N. Cell Press 2012 Neuron Vol.76 No.5
KIF5 (also known as kinesin-1) family members, consisting of KIF5A, KIF5B, and KIF5C, are microtubule-dependent molecular motors that are important for neuronal function. Among the KIF5s, KIF5A is neuron specific and highly expressed in the central nervous system. However, the specific roles of KIF5A remain unknown. Here, we established conditional Kif5a-knockout mice in which KIF5A protein expression was postnatally suppressed in neurons. Epileptic phenotypes were observed by electroencephalogram abnormalities in knockout mice because of impaired GABA<SUB>A</SUB> receptor (GABA<SUB>A</SUB>R)-mediated synaptic transmission. We also identified reduced cell surface expression of GABA<SUB>A</SUB>R in knockout neurons. Importantly, we identified that KIF5A specifically interacted with GABA<SUB>A</SUB>R-associated protein (GABARAP) that is known to be involved in GABA<SUB>A</SUB>R trafficking. KIF5A regulated neuronal surface expression of GABA<SUB>A</SUB>Rs via an interaction with GABARAP. These results provide an insight into the molecular mechanisms of KIF5A, which regulate inhibitory neural transmission.
HYDROPLANING ANALYSIS BY FEM AND FVM - EFFECT OF TIRE ROLLING AND TIRE PATTERN ON HYDROPLANING
Nakajima, Y.,Seta, E.,Kamegawa, T.,Ogawa, H. The Korean Society of Automotive Engineers 2000 International journal of automotive technology Vol.1 No.1
The new numerical procedure for hydroplaning has been developed by considering the following three important factors; fluid/structure interaction, tire rolling, and practical tread pattern. The tire was analyzed by FEM with Lagrangian formulation and the fluid is analyzed by FVM with Eulerian formulation. Since the tire and the fluid are modeled separately and their coupling is automatically computed by the coupling element, the fluid/structure interaction of the complex geometry such as the tire with the tread pattern can be analyzed practically. We verified the predictability of the hydroplaning simulation in the different parameters such as the water flow, the velocity dependence of hydroplaning, and the effect of the tread pattern on hydroplaning. In order to predict the streamline in the contact patch, the procedure of the global-local analysis was developed. Since the streamline could be predicted by this technology, we could develop the new pattern in a short period based on the principle; "make the stream line smooth".
Friction and Wear Behaviors of WC-Co/WC-Co Pairs in Air
Hosokawa H.,Nakajima T.,Shimojima K. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
To investigate sliding friction and wear behaviors of WC-Co/WC-Co pairs containing different WC grain sizes, the ball-on-disc test in air were carried out, where WC grain sizes a (F.G.) and (C.G.). The wear volume of F.G. pin for F.G. pin/C.G. disc is larger than that of F.G. pin for F.G. pin/F.G. disc due to higher friction coefficient, and the surfaces after wear test are richer in oxygen compared to those before test. Furthermore, the wear debris, which is composed of nona-scale grain, after the wear test are remarkably richer in oxygen than to those before test.
HYDROPLANING ANALYSIS BY FEN AND FVM:EFFECT OF TIRE ROLLING AND TIRE PATTERN ON HYDROPLANING
Y. NAKAJIMA,E. SETA,T. KAMEGAWA,H. OGAWA 한국자동차공학회 2000 International journal of automotive technology Vol.1 No.1
The new numerical procedure for hydroplaning has been developed by considering the following three important factors; fluid/structure interaction, tire rolling, and practical tread pattern. The tire was analyzed by FEM with Lagrangian formulation and the fluid is analyzed by FVM with Eulerian formulation. Since the tire and the fluid arc modeled separately and their coupling is automatically computed by the coupling element. the fluid/structure interaction of the complex geometry such as the tire with the tread pattern can be analyzed praetically. We verified the predictability of the hydroplaning simulation in the different parameters such as the water flow, the velocity dependence of hydroplaning. and the effect of the tread pattern on hydroplaning. In order to predict the streamline in the contact patch. the procedure of the global-local analysis was developed. Since the streamline could be predicted by this technology, we could develop the new pattern in a short period based on the principle; "make the stream line smooth",<br/>