WATER AIR AND SOIL POLLUTION
·
2021
·Vol. 232
·期 9
·1-14
·
IF 2.52
Han Rui,Li Kexin,We Chenzheng,He Tao,Liu Jingru,Zhang Renduo,Wan Li,Wu Yinghai
Titanium dioxide nanoparticles (TiO 2 NPs) can potentially impact constructed wetlands (CWs). The aim of this study was to investigate the rapid impacts on nitrogen removal performance and on the microbial community after short-term exposure to TiO 2 NPs in CWs, which were determined via 16S rDNA amplicon sequencing and Biolog-Eco technologies. The results showed that removal efficiencies declined by 23.9%, 32.2%, and 38.8% for ammonia nitrogen (NH 4 + -N) and by 26.5%, 43.4%, and 71.4% for nitrate nitrogen at TiO 2 NP concentrations of 50, 100, and 150 mg/L, respectively. Bacterial damage and TiO 2 NP agglomeration on the packing increased as the TiO 2 NP concentration increased. Microbes showed different tolerances against TiO 2 NPs, and members, such as the bacteria removing organic pollutants and NH 4 + -N, were susceptible to TiO 2 NPs. The order of microbial utilisation of the six carbon sources was determined, and the utilisation ratios declined as TiO 2 NP concentration increased. The concentration of 50 mg/L TiO 2 NPs impaired the functions of nitrifiers and denitrifiers in CWs after short-term exposure, and higher concentrations (100 mg/L and 200 mg/L) had no additional negative impact on the packing compared with the concentration of 50 mg/L.
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INVESTIGATIONAL NEW DRUGS
·
2020
·Vol. 39
·期 3
·627-635
·
IF 3.525
Chu Yafei,Xiao Zheng,Jing Nan,Yan Wenjuan,Wang Shanmei,Ma Bing,Zhang Jiangfeng,Li Yi
Arborinine is a natural product isolated from G. parva leaf extracts, which displays potentially antiproliferative activity against human cervical cancer cells. In contrast, its anticancer effects against gastric cancer cells and drug-resistant gastric cancer cells remain unknown. In this work, arborinine was evaluated as a broad-spectrum antiproliferative agent, and it exhibited potently inhibitory activity against NCI-N87 (IC 50 = 5.67 μM), BGC-823 (IC 50 = 7.26 μM), MGC803 (IC 50 = 4.75 μM), SGC-7901 (IC 50 = 1.96 μM), HGC-27 (IC 50 = 5.70 μM), SGC-7901/ADR (IC 50 = 0.24 μM), SGC-7901/VCR (IC 50 = 1.09 μM), and MGC803/PTX (IC 50 = 1.32 μM) cell lines. Subsequent target verification experiments demonstrated that arborinine selectively and reversibly inhibited LSD1 in a time-dependent manner. Furthermore, it was found that arborinine suppressed the epithelial-mesenchymal transition of gastric cancer cell line SGC-7901 and adriamycin-resistant gastric cancer cell line SGC-7901/ADR in a dose-dependent manner. The in vivo antitumor study further indicated that arborinine can significantly reduce the growth of tumors both in SGC-7901 and SGC-7901/ADR xenograft mouse models. Overall, we demonstrated the potential of arborinine as an effective treatment for gastric cancer and adriamycin-resistant gastric cancer.
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BIOTECHNOLOGY LETTERS
·
2012
·Vol. 34
·期 9
·1673-1678
·
IF 1.683
Chen Lei,Hu Ying-Dan,Li Ning,Zong Min-Hua
Cross-linked enzyme aggregates (CLEAs) of β -glucosidase were prepared and characterized. Under the optimum conditions, the activity recovery of CLEAs reached 84 %. The reduction by NaBH 4 resulted in slightly lower activities of CLEAs, while their thermostability was enhanced. CLEAs were more thermally stable than free enzyme (half lives, 973 vs. 518 min at 50 °C), while less stable than seed meal (half life, 1,090 min). In 90 % (v/v) t -butanol, the half lives of CLEAs and free enzyme were 53 and 6.7 h, respectively. Besides, the catalytic efficiency ( V
max / K
m ) of CLEAs was comparable to free enzyme (0.42 vs. 0.47 min −1 mg −1 ). This carrier-free immobilized enzyme had a network structure with multiple layers. The productivity of salidroside using CLEAs reached 150 g/l g catalyst, while being 6.3 g/l g with seed meal.
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INTERNATIONAL JOURNAL OF LEGAL MEDICINE
·
2021
·Vol. 135
·期 2
·431-440
·
IF 2.686
Jiang Bowei,He Wei,Jin Chuan,Liu Ying,Wen Dan,Wang Chudong,ZEYE Moutanou Modeste Judes,Li Jienan,Zha Lagabaiyila
Genotyping of short tandem repeat (STR) markers is the basic method of forensic science. Enhanced technologies are needed to meet the requirements of databasing and casework samples. The STRscan-17LC kit is a 6 Dye STR kit which amplifies 16 STR loci: D3S1358, TPOX, D16S539, vWA, D2S1338, CSF1PO, D19S433, D7S820, FGA, D8S1179, D5S818, D13S317, D18S51, TH01, D12S391, and D21S11 and the sex-determinant locus amelogenin. This kit is designed for better tolerance to PCR inhibitors and analysis of mildly degraded samples with all fragments smaller than 330 bases. In this study, the STRscan-17LC kit is validated according to the SWGDAM (Scientific Working Group on DNA Analysis Methods) guidelines, including PCR-based studies, sensitivity, precision and accuracy, inhibitors, species specificity, DNA mixture studies, population, and concordance studies. The validation results suggest that the STRscan-17LC kit is a useful tool for forensic application.
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NPG Asia Materials
·
2022
·Vol. 14
·期 1
·1-12
·
IF 10.761
Shen Peiyan,Li Mengru,Li Ran,Han Bo,Ma Haojie,Hou Xueyan,Zhang Yuqi,Wang Ji-Jiang
Smart photonic hydrogels based on two-dimensional photonic crystals (2DPC) provide a promising sensing platform for constructing novel chemical and biological sensors due to their facile optical signal readout and highly sensitive responsivity toward target analytes. Aptamers, as recognition elements with high selectivity and affinity, are extensively used to construct a variety of sensors. Herein, we developed two partially base complementary aptamer-functionalized 2DPC hydrogels as aptasensors for the detection of thrombin (TB) in human serum. The photonic hydrogel aptasensors swelled upon exposure to TB solution, leading to an increase in the particle spacing of the 2DPCs. The particle spacing changes were acquired by simply measuring the diameters of the Debye ring diffracted by the 2DPCs without the requirement of sophisticated instruments. The aptasensor swelling resulted from the decrease in the hydrogel cross-linking density induced by the specific binding between one of the aptamers and TB and the increase in hydrogel mixing free energy induced by the introduction of TB. The particle spacing increase of the optimized aptasensor was linear over the TB concentration range of 1–500 nM, and the limit of detection was 0.64 nM. The constructed 2DPC hydrogel aptasensor was used to detect TB in human serum and achieved recoveries of 95.74–104.21% and a relative standard deviation of 2.52–6.58%, showing the practicability and accuracy of the sensor. The aptamer-actuated 2DPC hydrogel biosensor provides a new strategy for designing other target molecule-sensitive aptasensors, showing great potential for development into home kits.
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Journal of Analysis and Testing
·
2021
·Vol. 5
·期 1
·30-39
·
IF 0
Luo Rong,Xia Yunsheng
The exploration of novel fluorescent tools for subcellular analysis is of great importance for both chemical biology and biomedicine. Herein, we present an in situ self-assembly strategy for fabricating fluorescent and monodisperse CdS supraparticles (SPs), which are subsequently employed for mitochondria targeting applications. Using bovine serum albumin and linear chain cationic surfactants as templates and electrostatic modulators, respectively, CdS SPs can be well fabricated by the proposed one-step self-assembly approach in aqueous medium. In addition to high stability, favorable biocompatibility, as well as decent quantum efficiency, the as-prepared SPs have mitochondria targeting capacity due to their cationic surfactant modification. Interestingly, the localization capacity is positively correlated with the length of the cationic surfactant molecules. As the carbon chains of the cationic surfactant molecules enhance from 10 to 16 atoms, the colocalization efficiencies are correspondingly increased from 81 to 84%. Graphical abstract
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Chinese Medicine
·
2019
·Vol. 14
·期 1
·1-11
·
IF 2.265
Guo Shangxin,Lin Xiaotong,Wang Yi,Gong Xingchu
Background The discovery of bioactive compounds in traditional Chinese medicine (TCM) has become an important field in TCM modernization. Ligand fishing is a suitable method for discovery of bioactive compounds in complex mixtures such as TCM with high selectivity. Because of unique advantage of low cost and convenience, paper-based microdevices can be good carriers for enzyme immobilized ligand fishing. Methods As an important enzyme for glucose metabolism, α-glucosidase was immobilized on polycaprolactone–chitosan-modified paper to prepare the microdevice with unique microfluid structure generated by 3D printing technology, which can be easily applied to screen active compounds in herbal extracts. The preparation conditions of the paper microarray were optimized. The activity of immobilized α-glucosidase was verified by colorimetric reactions which can be easily monitored by cellphone. The paper microarray with α-glucosidase immobilized was used to screen active compounds in the water extracts of mulberry leaves and lotus leaves. Results Several key parameters including Na 2 CO 3 solution concentration, Na 2 CO 3 solution volume, glutaraldehyde concentration, crosslinking time of glutaraldehyde and time of α-glucosidase immobilization were optimized. The proposed paper-based microarray was successfully applied in screening active compounds in two herbal extracts. Four compounds including chlorogenic acid, quercetin-3- O -glucuronide, isoquercetin, and quercetin were identified as α-glucosidase inhibitors. The compounds with significant non-specific adsorption caused by chitosan, such as isoquercitrin, astragalin, quercetin, were also found to be active compounds. Conclusions An enzyme immobilized paper microarray was designed and fabricated in this work. Polycaprolactone and chitosan were used to modify filter paper to prepare paper microarrays. Parameters of paper device preparation were optimized. Our findings suggested that 3D-printing paper-based microarrays can be a simple and low-cost approach for discovery of active compounds of TCM.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 12
·1-11
·
IF 6.408
Wang Yue,Zhai Hongguo,Yin Jiaqi,Guo Qi,Zhang Yuhao,Yang Qingqing,Li Falan,Sun Xia,Guo Yemin,Zhang Yanyan
With the development of exonuclease, the exonuclease has been used to construct a variety of aptasensor and to realize the signal amplification. Among them, based on silver nanoparticles (Ag NPs) and exonuclease I (Exo I)-assisted cycle signal amplification strategy, we designed a novel high-sensitivity dual-target electrochemical biosensor to detect Pb 2+ or Hg 2+ in water. In the presence of Hg 2+ , the Hg 2+ was fixed to the aptamer chain by thymine-Hg 2+ -thymine (T-Hg 2+ -T), resulting in the decrease of signal. When Pb 2+ was present, DNA single strand S2 dissociated and was bound to Pb 2+ , which automatically triggered Exo I to selectively cut the single chain from the recognition site to achieve the cyclic amplification of the electrochemical signal. The interaction between aptamer and Exo I was investigated by gel electrophoresis. Under the optimum conditions in the scan range -0.20 to 0.60 V, the biosensor had high sensitivity with a linear range of 100 pg/L to 10.0 mg/L, Pb 2+ or Hg 2+ , and the detection limits were 17.0 pg/L ( R 2 = 0.993) and 12.0 pg/L ( R 2 = 0.993), respectively. The relative standard deviation (RSD) of the sensor was 0.5–2.6%, and the recovery of spiked standard solutions was between 98.3 and 110%. The cycle amplification strategy supported by this enzyme has promising applications in detection of the two metal ions in various fields. Graphical Abstract
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JOURNAL OF NANOBIOTECHNOLOGY
·
2020
·Vol. 18
·期 1
·1-11
·
IF 6.518
Ji De,Wang Qiaohan,Zhao Qi,Tong Huangjin,Yu Mengting,Wang Meng,Lu Tulin,Jiang Chengxi
Hepatic stellate cells (HSCs) were activated and secreted excessive amounts of extracellular matrix (ECM) proteins during pathogenetic progress of liver fibrosis. Germacrone (GMO) and miR-29b can play an important role in inhibiting growth of HSCs and production of type I collagen. GMO and miR-29b were co-encapsulated into nanoparticles (NPs) based on poly(ethylene glycol)-block-poly(lactide-co-glycolide) (PEG-PLGA). Then, NPs were modified with cyclic RGD peptides (cRGDfK). cRGDfK is an effective ligand to bind integrin αvβ3 and increase the targeting ability for fibrotic liver. GMO- and miR-29b-loaded NPs exhibited great cytotoxicity to activated HSCs and significantly inhibited production of type I collagen. Liver fibrosis model of mice was induced by administration of carbon tetrachloride. Great targeting ability was achieved in liver fibrotic mice treated with cRGD-modified NPs. Significant ant-fibrotic effects have been presented based on hematoxylin and eosin (H&E), Masson and Sirius Red staining results of liver tissues collected from mice treated with drug-loaded NPs. All these results indicate GMO- and miR-29b-loaded cRGD-modified NPs have the potential for clinical use to treat liver fibrosis.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
·
2018
·Vol. 29
·期 6
·1-14
·
IF 2.448
Zhou Buguang,Zhou Qian,Wang Ping,Yuan Jiugang,Yu Yuanyuan,Deng Chao,Wang Qiang,Fan Xuerong
Silk fibroin (SF) can be extensively utilized in biomedical areas owing to its appreciable bioactivity. In this study, biocompatible composites of SF and hydroxyapatite (HAp) were fabricated through in situ biomimetic mineralization process. Graft copolymerization of acrylic acid (AA) onto SF was conducted by using the catalytic system of acetylacetone (ACAC), hydrogen peroxide (H 2 O 2 ) and horseradish peroxidase (HRP), for enhancing the deposition of apatite onto the fibroin chains. Subsequently, biomimetic mineralization of the prepared fibroin-based membrane was performed in Ca/P solutions to synthesize the organized SF/HAp composites. The efficacies of graft copolymerization and biomimetic mineralization were evaluated by means of ATR-FTIR, GPC, EDS-Mapping, XRD and others. The results denoted that AA was successfully graft-copolymerized with fibroin and formed the copolymer of silk fibroin-graft-polyacrylic acid (SF-g-PAA), and the grafting percentage (GP) and grafting efficiency (GE) under the optimal condition reached to 23.2% and 29.4%, respectively. More mineral phases were detected on the surface of SF-g-PAA membrane after mineralization process when compared to that of the untreated fibroin membrane, companying with an improved mechanical property. According to MG-63 cell viability and fluorescent adhesion assays, the mineralized SF-g-PAA composite showed satisfactory biocompatibility and exceptional adhesive effects as well. The synthetized composite of SF-g-PAA/HAp can be potentially applied in the fields of bone tissue engineering.
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Frontiers of Environmental Science & Engineering
·
2022
·Vol. 17
·期 2
·1-11
·
IF 6.048
Yang Fan,Li Junpeng,Wang Huan,Xiao Xiaofeng,Bai Rui,Zhao Feng
Manganese oxides are widely distributed in soils and sediments, affecting the migration and transformation of heavy metals and organic pollutants. The microbial conversion of soluble Mn(II) into insoluble Mn(III/IV) oxides is considered to be the initial source of manganese oxides in the environment; however, whether this process is related to a physiological role remains unclear. Here, we explored the microbial manganese oxidation process under visible light by using coastal surface seawater microorganisms. Visible light greatly promotes the oxidation rate of Mn(II), and the average rate reaches 64 µmol/(L·d). The generated manganese oxides were then conducive to Mn(II) oxidation, thus the rapid manganese oxidation was the result of the combined action of biotic and abiotic, and biological function accounts for 88 % ± 4 %. Extracellular superoxide produced by microorganisms induced by visible light is the decisive factor for the rapid manganese oxidation in our study. But the production of these superoxides does not require the presence of Mn(II) ions, the Mn(II) oxidation process was more like an unintentional side reaction, which did not affect the growth of microorganisms. More than 70 % of heterotrophic microorganisms in nature are capable of producing superoxide, based on the oxidizing properties of free radicals, all these bacteria can participate in the geochemical cycle of manganese. What’s more, the superoxide oxidation pathway might be a significant natural source of manganese oxide.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 4
·949-956
·
IF 2.726
Ruan Yawen,Huang Peiling,Yan Jiangyu,Li Guorui,Huang Jing
Targeted prodrug strategy, which utilizes the endogenous biomarkers in cancer cells as activators to release the active drug, has been well established either in the fundamental research or the clinical treatment. However, many prodrugs suffer from safety concern due to “off-target activation”. Dual or multiple biomarkers triggered prodrug may provide an effective strategy to overcoming the “off-target effect”. Melanoma cells have both high levels of reactive oxygen species(ROS) and tyrosinase(TYR), which makes them significantly different from other tumor cells and normal cells. Here we reported a series of quinazolinone-aryl boronic acid/ester-based prodrugs, which can be activated by the cascade of ROS and TYR and selectively kill melanoma cells. The structure-activity relationship(SAR) analysis revealed that mitochondria-targeting property was vital for their cytotoxicity and the dual activated effector played a significant role in their selectivity towards melanoma cells. Among these candidates, compound 4 b showed the highest toxicity to B16, leading to an imbalance of the redox system in melanoma cells, causing mitochondrial DNA damage, and then promoting melanoma cells death.
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