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Natronorubrum halophilum sp. nov. isolated from two inland salt lakes
Cong-Qi Tao,Yi Ding,Yang-Jie Zhao,Heng-Lin Cui 한국미생물학회 2020 The journal of microbiology Vol.58 No.2
Two halophilic archaeal strains, SHR37T and NEN6, were isolated from salt lakes located in the Tibet and Xinjiang regions of China. The two strains were found to form a single cluster (99.9% and 99.3% similarity, respectively) separating them from the six current members of Natronorubrum (94.7– 96.9% and 86.1–90.8% similarity, respectively) on the basis of the 16S rRNA and rpoB gene sequence similarities and phylogenetic analysis. Diverse phenotypic characteristics differentiate strains SHR37T and NEN6 from current Natronorubrum members. Their polar lipids are C20C20 and C20C25 glycerol diether derivatives of PG, PGP-Me, and a major glycolipid chromatographically identical to disulfated mannosyl glucosyl diether (S2-DGD). Four minor unidentified glycolipids are also present. The OrthoANI and in silico DDH values of the two strains were 97.3% and 76.1%, respectively, which were much higher than the threshold values proposed as a species boundary (ANI 95–96% and in silico DDH 70%), which revealed that the two strains represent one species; the two values (ANI 79.0–81.9% and in silico DDH 23.5– 25.7%) of the strains examined in this study and the current members of Natronorubrum are much lower than the recommended threshold values, suggesting that strains SHR37T and NEN6 represent a genomically different species of Natronorubrum. These results showed that strains SHR37T (= CGMCC 1.15233T = JCM 30845T) and NEN6 (= CGMCC 1.17161) represent a novel species of Natronorubrum, for which the name Natronorubrum halophilum sp. nov. is proposed.
Weng, Ling-Ling,Xiang, Jian-Feng,Lin, Jin-Bo,Yi, Shang-Hui,Yang, Li-Tao,Li, Yi-Sheng,Zeng, Hao-Tao,Lin, Sheng-Ming,Xin, Dong-Wei,Zhao, Hai-Liang,Qiu, Shu-Qi,Chen, Tao,Zhang, Min-Guang Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.24
Liver cancer is one of leading digestive malignancies with high morbidity and mortality. There is an urgent need for the development of novel therapies for this deadly disease. It has been proven that asparagus polysaccharide, one of the most active derivates from the traditional medicine asparagus, possesses notable antitumor properties. However, little is known about the efficacy of asparagus polysaccharide as an adjuvant for liver cancer chemotherapy. Herein, we reported that asparagus polysaccharide and its embolic agent form, asparagus gum, significantly inhibited liver tumor growth with transcatheter arterial chemoembolization (TACE) therapy in an orthotopic hepatocellular carcinoma (HCC) tumor model, while significantly inhibiting angiogenesis and promoting tumor cell apoptosis. Moreover, asparagine gelatinous possessed immunomodulatory functions and showed little toxicity to the host. These results highlight the chemotherapeutic potential of asparagus polysaccharide and warrant a future focus on development as novel chemotherapeutic agent for liver cancer TACE therapy.
Tao Wan,Songsong He,Tairan Wang,Jian Wang,Mingrui Yu,Yang Jianbo,Qi Tang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.11
Polyethylenimine(PEI)-modified magnetic hydrogel nanocomposite absorbents (PEI-mHNAs) were fabricated based on poly(acrylamide-co-acrylic acid) and PEI-modified magnetic nanoparticles by radical copolymerization. FTIR and XRD results preliminarily confirmed the target structure of PEI-mHNAs without destroying the structure of magnetic nanoparticles during modification and radical copolymerization. PEI-mHNAs with many rough porous and interstitial structure had high adsorption capacity of Cu(II) (217mg/g), Cd(II) (232mg/g) and Pb(II) (459mg/g). PEI-mHNAs had the best absorption capacity for heavy metal ions in the synthesis condition of acrylic acid/acrylamide mass ratio of 60 : 40, 0.8% initiator, AA neutralization degree of 70%, 0.75% crosslinker, and 15% PEImodified magnetic nanoparticles. Moreover, PEI-mHNAs had good magnetic responsiveness, high thermal stability and reusability, which make it a potential application in removing heavy metal ions from the contaminated wastewater.
Tao Shen,Wei Li,Yan-Yan Wang,Qing-Qing Zhong,Shu-Qi Wang,Xiao-Ning Wang,Dong-Mei Ren,Hongxiang Lou 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.3
In our cell based screening of antitumoringredients from plants, the EtOH extract of Garciniabracteata displayed antiproliferative effect against humanlung adenocarcinoma A549 cells, human breast cancerMCF-7 cells, and human prostate cancer PC3 cells. Phytochemicalinvestigation of this active extract producednine ingredients, and their structures were established byanalysis of MS and NMR spectra. Antiproliferative evaluationof isolated ingredients on A549, MCF-7 and PC3cells indicated that a xanthone named isobractatin (1)exhibited potent antiproliferative activity against the abovethree human cancer cell lines with IC50 values rangingfrom 2.90 to 4.15 lM. Treatment of PC3 cells with 1 led toan enhancement of the cell apoptosis, and arrested cellcycle in the G0/G1 phase. The G0/G1 phase cycle-relatedproteins analysis showed that the expressions of cyclins D1and E were reduced by 1, whereas the protein level of cyclin dependent kinase (CDK) inhibitor P21 was induced. Additionally, 1 enhanced PC3 cell apoptosis by activationsof Bax, caspases 3 and 9, and by inhibition of Bcl-2. Ourcombined data illustrated that isobractatin (1) was theantiproliferative ingredient of G. bracteata against threehuman cancer cell lines, which exerted its antiproliferatriveeffect via cell cycle arrest and induction of apoptosis.
( Qi Li ),( Tao Wu ),( Linguo Zhao ),( Jianjun Pei ),( Zhenzhong Wang ),( Wei Xiao ) 한국미생물 · 생명공학회 2019 Journal of microbiology and biotechnology Vol.29 No.12
β-Glucosidases and β-xylosidases are two categories of enzymes that could cleave out nonreducing, terminal β-D-glucosyl and β-D-xylosyl residues with release of D-glucose and Dxylose, respectively. In this paper, two functional β-glucosidase Dth3 and β-xylosidase Xln-DT from Dictyoglomus thermophilum were heterologously expressed in E.coli BL21 (DE3). Dth3 and Xln-DT were relatively stable at 75oC and were tolerant or even stimulated by glucose and xylose. Dth3 was highly tolerant to glucose with a Ki value of approximately 3 M. Meanwhile, it was not affected by xylose in high concentration. The activity of Xln-DT was stimulated 2.13- fold by 1 M glucose and 1.29-fold by 0.3 M xylose, respectively. Furthermore, the β- glucosidase Dth3 and β-xylosidase Xln-DT showed excellent selectivity to cleave the outer C-6 and C-3 sugar moieties of ASI, which established an effective and green method to produce the more pharmacologically active CAG, an exclusive telomerase activator. We measured temperature, pH and dosage of enzyme using a single-factor experiment in ASI biotransformation. After optimization, the optimal reaction conditions were as follows: 75oC, pH 5.5, 1 U of Dth3 and 0.2 U of Xln-DT, respectively. Under the optimized conditions, 1 g/l ASI was transformed into 0.63 g/l CAG with a corresponding molar conversion of 94.5% within 3 h. This is the first report to use the purified thermostable and sugar-tolerant enzymes from Dictyoglomus thermophilum to hydrolyze ASI synergistically, which provides a specific, environment-friendly and cost-effective way to produce CAG.
Qi Tang,Menghan Ye,Li Ma,Tao Zhou,Mengyu Gan,Fabing Yan 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2020 NANO Vol.15 No.03
In this work, the Ni–Mn layered double hydroxide (Ni–Mn LDH) nanopetals are fabricated on three-dimensional reduced graphene oxide/Ni foam (RGO/NF) by one-step hydrothermal method, in which the suspension of graphene oxide (GO) is directly reduced by nickel foam (NF) to obtain NF/RGO. The composite, which consists of interconnected Ni–Mn LDH nanopetals, forms a macroporous structure. Such an open space can promote electrolyte dispersion and ion diffusion of active substances, thus enhancing capacitance performance. Remarkable, during crystal growth, RGO can not only provide active sites for Ni–Mn LDH nanopetals, but also effectively connect Ni–Mn LDH nanopetals to NF, further promoting the electrochemical behavior of composite material. Moreover, RGO possess reasonable chemical stability which can improve the mechanical properties of the composite to obtain good stability. The experimental results show that the NF/RGO electrode material with Ni–Mn LDH nanopetals has excellent specific capacitance of 2250 F g -1 at 1 A g -1, good rate performance (the capacitance retention rate is still 64.0% at 10 A g -1) and excellent cycle life (45.1% at 10 A g -1 after 5000 cycles). NR/NM–LDH is used as the positive electrode and activated carbon is used as the negative electrode to assemble the asymmetric supercapacitor, the proper power density and energy density indicates that the NR/NM–LDH composite has great potential as an electrode material for supercapacitors.