CHEMOSPHERE
·
2014
·
IF 3.499
Dali Wang,Zhifen Lin,Zhifeng Yao,Hongxia Yu
The potential toxicities of nanoparticles (NPs) have been intensively discussed over the past decade. In addition to their single toxicities, NPs can interact with other environmental chemicals and thereby exert joint effects on biological systems and the environment. The present study investigated the combined toxicities of NPs and surfactants, which are among the chemicals that most likely coexist with NPs. Photobacterium phosphoreum was employed as the model organism. The results indicate that surfactants with different ion types can alter the properties of NPs (i.e., particle size and surface charge) in different ways and present complex joint effects on NP toxicities. Mixtures of different NPs and surfactants exhibited antagonistic, synergistic, and additive effects. In particular, the toxicity of ZnO was observed to result from its dissolved Zn 2+ ; thus, the joint effects of the ZnO NPs and surfactants can be explained by the interactions between the Zn ions and the surfactants. Our study suggests that the potential hazards caused by mixtures of NPs and surfactants are different from those caused by single NPs. Because surfactants are extensively used in the field of nanotechnology and are likely to coexist with NPs in natural waters, the ecological risk assessments of NPs should consider the impacts of surfactants.
研究领域:
环境科学
·
毒理学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2021
·
IF 3.247
Binchao Lu,Liang Wang,Xin Zheng,Zhongce Hu,Zhiyan Pan
Environmental contamination by 4-chlorophenol (4-CP) is a major concern. Photosynthetic bacteria have the ability to biodegrade 4-CP under dark aerobic conditions. In this study, we found that using different carbon sources (i.e. glucose, sodium acetate, sodium propionate sucrose, and malic acid) as co-metabolic substrates accelerated the biodegradation of 4-CP, and this acceleration was especially pronounced in the glucose treatment. A maximum degradation rate of 96.99% was reached under a concentration of 3.0 g·L−1 after 6 days of culture. The optimum conditions were pH 7.5, a temperature of 30°C, and a rotation speed of 135 rpm. The biodegradation of 4-CP was achieved at a range of salinities (0–3.0% NaCl, w/v). The biodegradation kinetics agreed with the Haldane model, and the kinetic constants were rmax = 0.14 d−1, Km = 33.9 mg·L−1, and Ki = 159.6 mg·L−1. Additionally, the coexistence of phenol or 2,4-dichlorophenol (2, 4-DCP) had a certain impact on the degradation of 4-CP under dark aerobic conditions. When the coexisting phenol concentration reached 100 mg·L−1, the maximum degradation rate of 4-CP reached 90.20%. The degradation rate of 4-CP decreased as the concentration of coexisting 2, 4-DCP increased.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PLoS One
·
2017
·Vol. 12
·期 3
·e0172747
·
IF 2.806
Xinying Zhang,Yan Wu,Gao Xiao,Zhenping Tang,Meiyin Wang,Fuchang Liu,Xuefeng Zhu
Azo dyes are very resistant to light-induced fading and biodegradation. Existing advanced oxidative pre-treatment methods based on the generation of non-selective radicals cannot efficiently remove these dyes from wastewater streams, and post-treatment oxidative dye removal is problematic because it may leave many byproducts with unknown toxicity profiles in the outgoing water, or cause expensive complete mineralization. These problems could potentially be overcome by combining photocatalysis and biodegradation. A novel visible-light-responsive hybrid dye removal agent featuring both photocatalysts (g-C 3 N 4 -P 25 ) and photosynthetic bacteria encapsulated in calcium alginate beads was prepared by self-assembly. This system achieved a removal efficiency of 94% for the dye reactive brilliant red X-3b and also reduced the COD of synthetic wastewater samples by 84.7%, successfully decolorized synthetic dye-contaminated wastewater and reduced its COD, demonstrating the advantages of combining photocatalysis and biocatalysis for wastewater purification. The composite apparently degrades X-3b by initially converting the dye into aniline and phenol derivatives whose aryl moieties are then attacked by free radicals to form alkyl derivatives, preventing the accumulation of aromatic hydrocarbons that might suppress microbial activity. These alkyl intermediates are finally degraded by the photosynthetic bacteria.
研究领域:
环境科学
·
微生物学
·
光催化技术
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Yishan Li,Nianbing Zhong,Qiang Liao,Qian Fu,Yun Huang,Xun Zhu,Qiaoliang Li
A novel photothermal biomaterial , designated GeO 2 -SiO 2 -Chitosan-Medium-LaB 6 (GSCML), was prepared to improve photosynthetic bacteria (PSB) biofilm development and hydrogen production performance. This biomaterial employed spectral beam splitting technology to increase the overall utilization of the incident light spectrum, which LaB 6 nanoparticles (NPs) mainly absorb light at approximately 380–510 and 660–780 nm and convert it into heat energy ; the transmit light is around 590 nm for PSB growth. The temperature increased, and the luminous intensity of the light transmitted through the prepared biomaterial are controlled by adjusting the LaB 6 NPs' content. The average biofilm growth rate and hydrogen production rate of the biofilm on the created biomaterial were 0.05 mg/cm 2 /day and 2.92 mmol/h/m 2 , which were 3.4 and 4.1 times higher than those of the glass slide, respectively. The properties of the GSCML biomaterial provide advantages for applications in immobilized cell technologies and photobioreactors.
研究领域:
生物技术
·
新能源研究
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
AQUATIC TOXICOLOGY
·
2014
·
IF 3.513
Dali Wang,Ya Gao,Zhifen Lin,Zhifeng Yao,Weixian Zhang
Metal oxide nanoparticles (NPs) have been used increasingly and are likely to accumulate in natural water bodies, where they encounter and interact with other environmental chemicals. These interactions result in joint effects on biological systems and the environment. However, compared with the intensive research examining the toxicities of individual NPs, the toxicities of NP mixtures remain relatively unexplored. In this work, we studied the joint effects of NPs and their most likely coexisting chemicals in the environment, including NPs with different compositions, humic substances, and surfactants. Our results indicate that the joint effects of NP mixtures were usually simple addition, which is commonly adopted in real risk assessment. However, the joint effects obtained for mixtures that contained ZnO were exclusively associated with antagonism. In addition, the mixtures of NPs and surfactants resulted in complex joint effects, i.e., antagonistic, additive, and synergistic effects were found for the mixtures with ZnO, NiO, and Fe-oxide, respectively. Our study suggests that the assessments of the ecological risk of NPs, particularly ZnO NPs, should consider the impact of their coexisting chemicals in the environment.
研究领域:
环境科学
·
毒理学
✓ 已验证
DOI
高影响因子
BIOTECHNOLOGY & BIOTECHNOLOGICAL EQUIPMENT
·
2015
·
IF 0.3
Hong-Lian Ge,Fu-Li Zhang
The aim of this study was to investigate whether the composite photosynthetic bacterial inoculant PS21 alleviate the damage inflicted on wheat seedlings by tetrabromobisphenol A (TBBPA). The biochemical characteristics of wheat seedlings were analysed through laboratory simulation after co-treating seedlings with PS21 and 0, 5, 10, 20, 40, 80 and 100 mg kg−1 TBBPA, respectively. The results showed that TBBPA reduced the total chlorophyll content and increased the malondialdehyde (MDA) content. TBBPA increased the soluble sugar content, soluble protein content and activate superoxide dismutase (SOD; EC: 1.15.1.1), catalase (CAT; EC: 1.11.1.6) and peroxidase (POD; EC: 1.11.1.7) at low concentrations, while it reduced soluble sugar content, soluble protein content and decreased the activities of SOD, CAT and POD at high concentrations. At the concentration of 107 CFU mL−1, PS21 could markedly relieve the toxicity of different concentrations of TBBPA on wheat seedlings. Wheat seedlings treated with both TBBPA and PS21 showed a higher soluble sugar content, higher soluble protein content, higher SOD, CAT and POD activities, and a lower MDA content as compared to those treated only with TBBPA. The composite photosynthetic bacterial inoculant PS21 significantly alleviates the damage inflicted on wheat seedlings by TBBPA.
研究领域:
植物生理学
·
环境生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2025
·
IF 16
Si-Min Zeng,Wen-Qiang Qu,Yu-Liang Sun,Ke-Wei Chen,Kai Zhao,Jian-Hua Yan,Cheng Zhang,Chun-Xiao Liang,Yu Chen,Ting Pan,Aixi Yu,Xian-Zheng Zhang
Hypoxia-related adenosine (Ado) exerts an immunosuppressive effect in tumors by binding to the metabolic checkpoint Ado A2A receptors (A2AR), thereby hindering the activation of antitumor immunity induced by immunogenic cell death (ICD). In this study, a MnO2-assisted photosynthetic bacteria (PSB) biohybrid (MnO2@PSB) is developed to enhance tumor photothermal immunotherapy by interfering with the Ado-A2AR metabolic pathway. Specifically, manganese dioxide (MnO2) nanoflowers are conjugated onto PSB by the carbodiimide reaction to construct the biohybrid MnO2@PSB. As a photothermal agent, MnO2@PSB generates heat to “burn” tumor cells under 808 nm laser irradiation, inducing tumor cell ICD. Meanwhile, MnO2@PSB catalyzes the decomposition of endogenous hydrogen peroxide into oxygen to alleviate tumor hypoxia, thereby reducing Ado production and downregulating the expression of A2AR, further reversing the tumor immunosuppressive microenvironment and amplifying the ICD effects. In various mouse 4T1 tumor models, MnO2@PSB can enhance antitumor immune responses, prolong mouse survival, and significantly inhibit tumor growth, recurrence, and metastasis under 808 nm laser irradiation. Collectively, this study provides a direction for enhanced antitumor immunotherapy through regulating metabolic pathways.
研究领域:
肿瘤学
·
免疫治疗
·
代谢通路调控
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Mu Bin,Hao Xiangnan,Luo Xiao,Yang Zhongke,Lu Huanjun,Tian Wei
Light-harvesting is an indispensable process in photosynthesis, and researchers have been exploring various structural scaffolds to create artificial light-harvesting systems. However, achieving high donor/acceptor ratios for efficient energy transfer remains a challenge as excitons need to travel longer diffusion lengths within the donor matrix to reach the acceptor. Here, we report a polymeric supramolecular column-based light-harvesting platform inspired by the natural light-harvesting of purple photosynthetic bacteria to address this issue. The supramolecular column is designed as a discotic columnar liquid crystalline polymer and acts as the donor, with the acceptor intercalated within it. The modular columnar design enables an ultrahigh donor/acceptor ratio of 20000:1 and an antenna effect exceeding 100. Moreover, the spatial confinement within the supramolecular columns facilitates control over the energy transfer process, enabling dynamic full-color tunable emission for information encryption applications with spatiotemporal regulation security.
研究领域:
材料科学
·
光化学
·
纳米技术
·
光电
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 37
·15070-15081
·
IF 5.7
He Lin,Shuangqiang Fang,Tianchun Lang,Jiali Yu,Haoliang Cheng,Jiaqi Ou,Zhijie Ye,Renjie Xu,Xiulan Shui,Haolin Qu,Le Wang
Near-infrared (NIR) luminescent materials exhibit unique photophysical properties that make them crucial components in photobiological, photonic and optoelectronic applications. Nonetheless, almost all rare earth ions are difficult to be efficiently excited by blue light for NIR emission, mainly due to the inherent electron shielding effect of 5s25p6 orbitals. Here, an amazing enhancement of the Tm3+ 3H4 → 3H6 transition (800 nm) was achieved in the SrGa12O19 host upon 450 nm excitation. Compared with the Tm3+ single-doped sample, the internal quantum efficiency (IQE) in the 700–900 nm range was significantly improved from less than 1% to 74%, and the external quantum efficiency (EQE) was enhanced from nearly 0 to 33%, benefitting from the synergistic effect of Cr3+ contribution and electron shielding effect breaker of In3+. XRD structure refinement, time-resolved fluorescence spectroscopy and electron paramagnetic resonance were used to determine the effect of Cr3+ and In3+ doping. Furthermore, the universality of this strategy has also been verified with other rare earth ions (Ho3+, Nd3+, and Yb3+). Finally, a NIR phosphor-converted LED (pc-LED) is fabricated, exhibiting a satisfactory output power of 141 mW@500 mA and demonstrating the potential for photosynthetic bacteria culture, venous imaging and non-destructive testing. This work opens a window for blue light-pumped NIR emission of rare earth ions.
研究领域:
材料科学
·
光学
·
生物光子学
·
光生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）