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DEEP INFRARED SURVEYS OF STAR FORMING REGIONS IN THE MWG AND LMC
NAKAJIMA YASUSHI The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.2
On behalf of the IRSF/SIRIUS group, I introduce some recent results from our deep near-infrared surveys (J, Hand Ks bands, limiting magnitude of Ks=17) toward star forming regions in the Milky Way Galaxy (MWG) and Large Magellanic Cloud (LMC) with the near-infrared camera SIRIUS. We discovered a rich population of low-mass young stellar objects associated with the W3 and NGC 7538 regions in the MWG based on the near-infrared colors arid magnitudes. The high sensitivity of our survey enables us to detect intermediate-mass pre-main sequence stars, i.e. HAEBE stars, even in the LMC. We detected many HAEBE candidate stars in the N159/N160 complex star forming region in the LMC with the IRSF 1.4-m telescope. Spatial distributions of the young stellar objects indicate the sequential cluster formation in each star forming region in the complex and large scale (a few ${\times}$ 100 pc) sequential cluster formation over the entire complex.
Anti-dementia Activity of Nobiletin, a Citrus Flavonoid: A Review of Animal Studies
Akira Nakajima,Kiyofumi Yamada,Yasushi OHIZUMI 대한정신약물학회 2014 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.12 No.2
Alzheimer’s disease (AD), the most common form of dementia among the elderly, is characterized by the progressive declineof cognitive function and has a detrimental impact worldwide. Despite intensive laboratory and clinical research over the lastthree decades, pharmacological options for the prevention and effective long-term treatment of AD are not currently available. Consequently, successful therapeutic and preventive treatments for AD are needed. When researching materials from naturalresources having anti-dementia drug activity, we identified nobiletin, a polymethoxylated flavone from the peel of Citrus depressa. Nobiletin exhibited memory-improving effects in various animal models of dementia and exerted a wide range of beneficial effectsagainst pathological features of AD including amyloid-β (Aβ) pathology, tau hyperphosphorylation, oxidative stress, cholinergicneurodegeneration and dysfunction of synaptic plasticity-related signaling, suggesting this natural compound could become anovel drug for the treatment and prevention of AD.
A NEAR-INFRARED STUDY OF THE HIGHLY-OBSCURED ACTIVE STAR-FORMING REGION W51B
Kim, Hyo-Sun,Nakajima, Yasushi,Sung, Hwan-Kyung,Moon, Dae-Sik,Koo, Bon-Chul The Korean Astronomical Society 2007 Journal of The Korean Astronomical Society Vol.40 No.1
We present wide-field $JHK_s$-band photometric observations of the three compact H II regions G48.9-0.3, G49.0-0.3, and G49.2-0.3 in the active star-forming region W51B. The star clusters inside the three compact H II regions show the excess number of stars in the $J-K_s$ histograms compared with reference fields. While the mean color excess ratio $(E_{J-H}/E_{H-K_s})$ of the three compact H II regions are similar to ${\sim}2.07$, the visual extinctions toward them are somewhat different: ${\sim}17$ mag for G48.9-0.3 and G49.0-0.3; ${\sim}23$ mag for G49.2-0.3. Based on their sizes and brightnesses, we suggest that the age of each compact H II region is ${\leq}2\;Myr$. The inferred total stellar mass, ${\sim}1.4{\times}10^4M_{\odot}$, of W51B makes it one of the most active star forming regions in the Galaxy with the star formation efficiency of ${\sim}10%$.
Asako Nogami,Masato Yoneda,Michihiro Iwaki,Takashi Kobayashi,Yasushi Honda,Yuji Ogawa,Kento Imajo,Satoru Saito,Atsushi Nakajima 대한간학회 2023 Clinical and Molecular Hepatology(대한간학회지) Vol.29 No.-
Non-alcoholic fatty liver disease is currently the most common chronic liver disease, affecting up to 25% of the global population. Simple fatty liver, in which fat is deposited in the liver without fibrosis, has been regarded as a benign disease in the past, but it is now known to be prognostic. In the future, more emphasis should be placed on the quantification of liver fat. Traditionally, fatty liver has been assessed by histological evaluation, which requires an invasive examination; however, technological innovations have made it possible to evaluate fatty liver by non-invasive imaging methods, such as ultrasonography, computed tomography, and magnetic resonance imaging. In addition, quantitative as well as qualitative measurements for the detection of fatty liver have become available. In this review, we summarize the currently used qualitative evaluations of fatty liver and discuss quantitative evaluations that are expected to further develop in the future.
Near-infrared Polarimetry of the Outflow Source AFGL 6366S: Detection of Circular Polarization
Kwon, Jungmi,Nakagawa, Takao,Tamura, Motohide,Hough, James H.,Kandori, Ryo,Choi, Minho,Kang, Miju,Cho, Jungyeon,Nakajima, Yasushi,Nagata, Tetsuya American Institute of Physics 2018 The Astronomical journal Vol.156 No.1