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Anomalous magnetization jumps in granular Pb superconducting films
Zhang An-Lei,Jiang Wan-Yan,Chen Xing-Hong,Zhang Xiao-Ke,Lu Wen-Lai,Chen Fei,Feng Zhen-Jie,Cao Shi-Xun,Zhang Jin-Cang,Ge Jun-Yi 한국물리학회 2022 Current Applied Physics Vol.35 No.-
In granular superconductors, the grain boundaries are closely related to the vortex dynamics and the macroscopic superconducting properties. In our research, Pb films with different grain sizes were prepared by tuning the substrate temperature. With the grain size decreasing, Pb films are prone to feature the anomalous magnetization jumps in the M − T curves, while in the M − H curves flux avalanche happens. Both phenomena appear in the same region of the H − T phase diagram and thus are considered to have the same origin. The further theoretical analysis shows that with grain size decreasing the pinning mechanism evolves from a mixed δTc and δl pinning to the δl pinning mechanism. The results shed light on the study of pinning mechanism for granular superconductors and is beneficial to the potential application of manipulating vortex pinning by regulation of intrinsic defects.
Mouse Fyn induces pseudopodium formation in Chinese hamster ovary cells
Lei An,Shengnan Liu,Wei Zhang,Yamei Zhang,Yingxue Huang,Xinde Hu,Shu-lin Chen,Shanting Zhao 대한수의학회 2014 JOURNAL OF VETERINARY SCIENCE Vol.15 No.1
Molecular mechanisms underlying the effects of Fyn on cellmorphology, pseudopodium movement, and cell migrationwere investigated. The Fyn gene was subcloned into pEGFP-N1to produce pEGFP-N1-Fyn. Chinese hamster ovary (CHO)cells were transfected with pEGFP-N1-Fyn. The expression ofFyn mRNA and proteins was monitored by reversetranscription-PCR and Western blotting. Additionally,transfected cells were stained with 4´,6-diamidino-2-phenylindole and a series of time-lapse images was taken. Sequences of the recombinant plasmids pMD18-T-Fyn andpEGFP-N1-Fyn were confirmed by sequence identificationusing National Center for Biotechnology Information in USA,and Fyn expression was detected by RT-PCR and Westernblotting. The morphology of CHO cells transfected with therecombinant vector was significantly altered. Fyn expressioninduced filopodia and lamellipodia formation. Based on theseresults, we concluded that overexpression of mouse Fyn inducesthe formation of filopodia and lamellipodia in CHO cells, andpromotes cell movement.
Analysis the role of arabidopsis CKRC6/ASA1 in auxin and cytokinin biosynthesis
Dong-Wei Di,Lei Wu,Pan Luo,Li Zhang,Tian-Zi Zhang,Xue Sun,Shao-Dong Wei,Chen-Wei An,Guang-Qin Guo 한국식물학회 2016 Journal of Plant Biology Vol.59 No.2
The crosstalk between auxin and cytokinin (CK) is important for plant growth and development, although the underlying molecular mechanisms remain unclear. Here, we describe the isolation and characterization of a mutant of Arabidopsis Cytokinin-induced Root Curling 6 (CKRC6), an allele of ANTHRANILATE SYNTHASE ALPHA SUBUNIT 1 (ASA1) that encodes the á-subunit of AS in tryptophan (Trp) biosynthesis. The ckrc6 mutant exhibits root gravitropic defects and insensitivity to both CK and the ethylene precursor 1-aminocyclopropane-1-carboxylicacid (ACC) in primary root growth. These defects can be rescued by exogenous indole-3-acetic acid (IAA) or tryptophan (Trp) supplementation. Furthermore, our results suggest that the ckrc6 mutant has decreased IAA content, differential expression patterns of auxin biosynthesis genes and CK biosynthesis isopentenyl transferase (IPT) genes in comparison to wild type. Collectively, our study shows that auxin controls CK biosynthesis based on that CK sensitivity is altered in most auxin-resistant mutants and that CKs promote auxin biosynthesis but inhibit auxin transport and response. Our results also suggest that CKRC6/ASA1 may be located at an intersection of auxin, CK and ethylene metabolism and/or signaling.
Luo Jia,Yang Yiting,Liao Kun,Liu Bin,Chen Ying,Shen Linyuan,Chen Lei,Jiang An’an,Liu Yihui,Li Qiang,Wang Jinyong,Li Xuewei,Zhang Shunhua,Zhu Li 아세아·태평양축산학회 2020 Animal Bioscience Vol.33 No.8
Objective: The QingYu pig is well known for its excellent meat quality attributes in Sichuan province, China. In order to improve its production efficiency, the determination of genetic factors contributing to quantifiable economic traits of livestock is important. Moreover, the cross-breeding of QingYu pigs with western breeds possessing strong growth attributes is an efficient way to improve the performance of this breed. Methods: Here, the genetic parameters of several important reproductive traits of QingYu pigs were estimated, include total number born (TNB), number born alive, litter birth weight, individual birth weight, number of piglets weaned, litter weaning weight, and individual weaning weight. The data was analyzed using the ASReml 3.0 software (NSW Inc., Sydney, Australia). Furthermore, the effects of crossing Berkshire with QingYu (BQ) pigs on carcass and meat quality traits, as well as the effects of slaughter weight on carcass and meat quality of BQ were characterized. Results: QingYu pigs exhibited superior reproductive traits. The TNB available to QingYu pigs was more than 8 per parity. The observed repeatability of the reproductive traits of the QingYu pigs was between 0.10 and 0.23. The significantly correlated genetic and phenotypic of reproduction traits were consistent. Interestingly, the BQ pigs exhibited improved carcass quality, with a significant increase in loin muscle area, lean percentage and reduction in sebum percentage. As a result, BQ had higher L45min, lower cooking scores, and lower drip loss. In addition, the loin muscle area, body length, and sebum percentage were significantly higher in 90 and 100 kg animals. Cooking loss showed a significant increase at 80 kg, and marbling increased significantly from 90 kg. Conclusion: The results of this study suggest that QingYu pigs exhibit excellent reproductive properties and heritability of these traits. Crossing with Berkshire is an efficient strategy to improve the carcass and meat quality of QingYu pigs for commercial operations. Furthermore, it appears as though the optimal slaughter weight of BQ pigs is at approximately 90 kg.
An, Fu-Fei,Liu, Yuan-Chong,Zhang, Wei-Wei,Liang, Lei Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.10
Dictamnine (Dic) has the ability to exert cytotoxicity in human cervix, colon, and oral carcinoma cells and dihydroartemisinin (DHA) also has potent anticancer activity on various tumour cell lines. This report explores the molecular mechanisms by which Dic treatment and combination treatment with DHA and Dic cause apoptosis in human lung adenocarcinoma A549 cells. Dic treatment induced concentration- and time-dependent cell death. FCM analysis showed that Dic induced S phase cell cycle arrest at low concentration and cell apoptosis at high concentration in which loss of mitochondrial membrane potential (${\Delta}{\Psi}m$) was not involved. In addition, inhibition of caspase-3 using the specific inhibitor, z-DQMD-fmk, did not attenuate Dic-induced apoptosis, implying that Dic-induced caspase-3-independent apoptosis. Combination treatment with DHA and Dic dramatically increased the apoptotic cell death compared to Dic alone. Interestingly, pretreatment with z-DQMD-fmk significantly attenuated DHA and Dic co-induced apoptosis, implying that caspase-3 plays an important role in Dic and DHA co-induced cell apoptosis. Collectively, we found that Dic induced S phase cell cycle arrest at low concentration and cell apoptosis at high concentration in which mitochondria and caspase were not involved and DHA enhanced Dic induced A549 cell apoptosis via a caspase-dependent pathway.
Lei Zhou,Xiao-Fei An,Shi-Chao Teng,Jing-Shun Liu,Wen-Bin Shang,Ai-Hua Zhang,Yang-Gang Yuan,Jiang-Yi Yu 한국식품영양과학회 2012 Journal of medicinal food Vol.15 No.5
Diabetic nephropathy (DN) is an important diabetic complication, and podocyte apoptosis plays a critical role in the development of DN. In the present study, we examined the preventive effect of the total flavone glycosides of Flos Abelmoschus manihot (TFA) on urinary microalbumin and glomerular podocyte apoptosis in experimental DN rats. The preliminary oral administration of TFA (200 mg/kg/day) for 24 weeks significantly decreased the urinary microalbumin to creatinine ratio and 24-h urinary total protein in streptozotocin-induced DN rats. Terminal deoxynucleotidyl transferasemediated dUTP nick end-labeling assay indicated glomerular cell apoptosis in DN rats was significantly improved by pretreatment with TFA. Furthermore, fluorescence-activated cell sorting and Hoechst 33342 staining suggested preincubation with hyperoside (50 and 200 lg/mL), the major active constituent of TFA, could significantly mitigate cultured podocyte apoptosis induced by the advanced glycation end-products (AGEs). Western blot analysis showed that increased caspase-3 and caspase-8 expressions induced by AGEs were also inhibited by pretreatment with hyperoside at both doses. Our results demonstrate that TFA pretreatment can decrease urinary albumin excretion in early-stage DN, which might be accomplished by preventing renal damage and podocyte apoptosis.
Robust Object Tracking with Mutualism between Particle Filter and Geometric Active Contour
Lei Sun,Sun-an Wang,Jin-hua Zhang,Xiao-hu Li 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.12
Robust object tracking is important in many real applications. This study proposes a novel robust object tracking algorithm that combines particle filter and geometric active contour. In contrast to conventional combinations, the proposed algorithm establishes mutualism, wherein the particle filter provides curve initialization for the active contour by using the alpha shape algorithm, and the active contour provides evolved boundary for particle filter classification. The refined particles are used to estimate the states which reduce the distance error. Discriminable object feature is proposed to enhance the tracking robustness, and prior information-based curve evolution is used to improve the accuracy of boundary segmentation. Comparable experiments are performed using a stand particle filter and continuously adaptive mean-shift methods. The proposed algorithm is found to be highly robust for long video sequences with non-linear motion, scale changes and clutter background.
Guoli Wang,Tianyue An,Cong Lei,Xiaofeng Zhu,Li Yang,Lianxue Zhang,Ronghua Zhang 고려인삼학회 2022 Journal of Ginseng Research Vol.46 No.3
Brain-derived neurotrophic factor (BDNF)etropomyosin-related kinase B (TrkB) plays acritical role in the pathogenesis of depression by modulating synaptic structural remodeling and functional transmission. Previously, we have demonstrated that the ginsenoside Rb1 (Rb1) presents a novelantidepressant-like effect via BDNFeTrkB signaling in the hippocampus of chronic unpredictable mildstress (CUMS)-exposed mice. However, the underlying mechanism through which Rb1 counteractsstress-induced aberrant hippocampal synaptic plasticity via BDNFeTrkB signaling remains elusive. Methods: We focused on hippocampal microRNAs (miRNAs) that could directly bind to BDNF and areregulated by Rb1 to explore the possible synaptic plasticity-dependent mechanism of Rb1, which affordsprotection against CUMS-induced depression-like effects. Results: Herein, we observed that brain-specific miRNA-134 (miR-134) could directly bind to BDNF 30UTRand was markedly downregulated by Rb1 in the hippocampus of CUMS-exposed mice. Furthermore, thehippocampusetargeted miR-134 overexpression substantially blocked the antidepressant-like effects ofRb1 during behavioral tests, attenuating the effects on neuronal nuclei-immunoreactive neurons, thedensity of dendritic spines, synaptic ultrastructure, long-term potentiation, and expression of synapseassociated proteins and BDNFeTrkB signaling proteins in the hippocampus of CUMS-exposed mice. Conclusion: These data provide strong evidence that Rb1 rescued CUMS-induced depression-like effectsby modulating hippocampal synaptic plasticity via the miR-134-mediated BDNF signaling pathway.