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Anisotropic In-plane Resistivity and Magnetoresistance of the Detwinned BaFe2As2
Lin Jiao,Zong Fa Weng,Xue Yan Tang,Lu Kai Guo,Tian Shang,Lin Yang,Hui Qiu Yuan,Yu Ying Wu,Zheng Cai Xia 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have measured the electrical resistivity and the magnetoresistance of detwinned BaFe2As2single crystals in fields up to 16 Tesla. The temperature dependence of the resistivity shows acounterintuitive anisotropic behavior in the ab-plane, likely arising from the effect of the nematicsusceptibility. Little magnetoresistance is observed at temperatures above the structural/magnetictransition, below which a huge in-plane magnetoresistance with an anisotropy is detected.
Precise asymptotics in the law of the logarithm for the rescaled range statistic
Zheng-Yan Lin,Tian-Xiao Pang,황교신 한국통계학회 2013 Journal of the Korean Statistical Society Vol.42 No.2
For a sequence of i.i.d. zero mean random variables belonging to the domain of attraction of the normal law, two results concerning the rescaled range statistic are investigated in this paper. More specifically, we obtain precise asymptotics in the law of the logarithm related to complete convergence and a.s. convergence under some mild conditions.
The crosstalk between bacteria and host autophagy: host defense or bacteria offense
Zheng Lin,Wei Fang,Li Guolin 한국미생물학회 2022 The journal of microbiology Vol.60 No.5
Xenophagy is a specific selective autophagy for the elimination of intracellular bacteria. Current evidence suggests that the processes for host autophagy system to recognize and eliminate invading bacteria are complex, and vary according to different pathogens. Although both ubiquitin-dependent and ubiquitin-independent autophagy exist in host to defense invading bacteria, successful pathogens have evolved diverse strategies to escape from or paralyze host autophagy system. In this review, we discuss the mechanisms of host autophagy system to recognize and eliminate intracellular pathogens and the mechanisms of different pathogens to escape from or paralyze host autophagy system, with a particular focus on the most extensively studied bacteria.
Zheng Lin Zhao,Guang Wen Zhao,Li Li,Meng Quan Li,Li Xin Guan,Xu Dong Yang,Hou Zhong Li,Feng Lin,Jong Rok Lee,Rong Jie Zhao 한국독성학회 2009 Toxicological Research Vol.25 No.1
The effects of aqueous extract of Schizandra Chinensis Fruit (AESC) on cadmium-induced changes of monoamine neurotransmitters in the different brain regions of adult rats were investigated. Male rats were received intraperitoneal (i.p.) administration of CdCl₂ (0.6 ㎎/㎏/d) for 21 days and sacrificed 7 days after the last administration. Concentrations of norepinephrine (NE), dopamine (DA) in striatum and serotonin (5-HT), 5-hydroxyindole acetic acid (5-HIAA) in cortex were measured by HPLC. There were significant decreases of NE, DA, 5-HT and 5-HIAA in Cd intoxicated rats (P < 0.05), while pretreatment with AESC (20 ㎎/㎏/d or 60 mg/kg/d, p.o., 30 min before CdCl₂) greatly inhibited the decrease of monoamine transmitters, respectively (P < 0.05). Also, AESC significantly increased the reduction of glutathione contents and superoxide dismutase activities in cortex induced by CdCl₂. These results suggest that AESC ameliorates Cd-induced depletion of monoamine neurotransmitters in brain through its antioxidant activity.
Zheng Lin Zhao,XiuDong Jin,Yi Yan Wu,Xu Dong Yang,YanJi Xu,James ZhongJian Jiang,김상찬,이봉효,양재하,조용걸 사단법인약침학회 2013 Journal of Acupuncture & Meridian Studies Vol.6 No.5
In a previous study, acupuncture at acupoint HT7 attenuated ethanol withdrawal-induced anxiety-like behavior in rats by normalizing amygdaloid catecholamines. In the present study, the involvement of amygdaloid corticotropin-releasing factor (CRF) in the anxiolytic effect of acupuncture was investigated during ethanol withdrawal. Rats were intraperitoneally treated with 3 g /kg/day of ethanol for 28 days, and the CRF mRNA levels in the central nucleus of the amygdala (CEA) were measured by using a RT-PCR analysis 72 hours after the last dose of ethanol. During ethanol withdrawal, the rats were bilaterally treated with acupuncture at acupoints HT7, PC6 or at a non-acupoint (Tail) for one min/day for three days. Also, rats were bilaterally injected with CRF into the CEA five minutes after the third acupuncture treatment , after which followed by the elevated-plus maze (EPM) test and the plasma corticosterone radioimmunoassay (RIA) were administered. The RT-PCR analysis showed a significant increase in the amygdaloid CRF mRNA levels in the ethanol-withdrawn rats compared with both the saline-treated rats and the rats treated with acupuncture at HT7, but neither acupuncture at PC6 nor acupuncture at a non-acupoint significantly inhibited the increased mRNA expression. The EPM test and the RIA also showed that the post-acupuncture infusion of CRF greatly reduced the anxiolytic effect of acupuncture at HT7. These results suggest that during ethanol withdrawal, the anxiolytic effect of acupuncture may be mediated through the modulation of amydaloid CRF during ethanol withdrawal.
Zheng Lin Zhao,김상찬,Jie Zhang,Hong Feng Liu,이봉효,장은영,이철원,조일제,안원근,양재하,김영우,Rong Jie Zhao,Yi Yan Wu 사단법인약침학회 2016 Journal of Acupuncture & Meridian Studies Vol.9 No.1
A previous study demonstrated that acupuncture at ST36 (Zu-San-Li) attenuates ethanol withdrawal (EW)-induced hyperactivation of the hypothalamic–pituitary–adrenal axis in rats. The current study investigated the involvement of hypothalamic norepinephrine (NE) in that process. Rats were intraperitoneally treated with 3 g/kg/d of ethanol or saline for 28 days. After 24 hours of EW, acupuncture was applied to rats at bilateral ST36 points or at nonacupoints (tail) for 1 minute. A high-performance liquid chromatography analysis showed that EW significantly increased both the NE and the 3-methoxy-4-hydroxy-phenylglycol (MHPG) levels in the hypothalamic paraventricular nucleus (PVN). Western blot analysis also revealed that EW markedly elevated the phosphorylation rates of tyrosine hydroxylase (TH), but spared TH protein expression in the PVN. However, acupuncture at ST36, but not at nonacupoints, greatly inhibited the increase in the hypothalamic NE, MHPG, and phosphorylation rates of TH. Additionally, postacupuncture infusion of NE into the PVN significantly attenuated the inhibitory effects of acupuncture at ST36 on the oversecretion of plasma corticosterone during EW. These results suggest that acupuncture at ST36 inhibits EW-induced hyperactivation of the hypothalamic NEergic system to produce therapeutic effects on the hypothalamic–pituitary–adrenal axis.
Synchronization for IR-UWB System Using a Switching Phase Detector-Based Impulse Phase-Locked Loop
Lin Zheng,Zhenghong Liu,Mei Wang 한국전자통신연구원 2012 ETRI Journal Vol.34 No.2
Conventional synchronization algorithms for impulse radio require high-speed sampling and a precise local clock. Here, a phase-locked loop (PLL) scheme is introduced to acquire and track periodical impulses. The proposed impulse PLL (iPLL) is analyzed under an ideal Gaussian noise channel and multipath environment. The timing synchronization can be recovered directly from the locked frequency and phase. To make full use of the high harmonics of the received impulses efficiently in synchronization, the switching phase detector is applied in iPLL. It is capable of obtaining higher loop gain without a rise in timing errors. In different environments, simulations verify our analysis and show about one-tenth of the root mean square errors of conventional impulse synchronizations. The developed iPLL prototype applied in a high-speed ultra-wideband transceiver shows its feasibility, low complexity, and high precision.