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Effect of Sr^2+ and Dy^3+ co-doping on coloration and temperature stabilization of a γ-Ce2S3 red pigment

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Journal of Rare Earths 2020年第2期38卷 213-218页

作者： Yueming Li Qi Liu Fusheng Song Zhumei Wang Zongyang Shen Yan Hong National Light Industry Key Laboratory of Functional Ceramic Materials Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi ProvinceSchool of Materials Science and EngineeringJingdezhen Ceramic InstituteJingdezhen 333403China

In this paper,a Sr^2+and Dy^3+co-doped γ-Ce2S3 red pigment was synthesized via a combination of coprecipitation and sulfurization *** oxide was prepared by presintering the coprecipitates,(Ce,Sr,Dy)CO3,followed by high-temperature sulfurization under a CS2 *** effects of the sulfurization temperature,time,and doped proportion on the phase composition,color performance and temperature stability of γ-Ce2S3 were systematically *** results show that a stable γ-Ce2S3 red pigment can be obtained through Sr^2+and Dy^3+co-doping at 730℃ for 200 *** diffraction peaks of all the samples shift to higher 2θ values with increasing doping proportion,indicating that part of the Dy^3+species enter the lattice and form a solid *** band gap of the samples remains practically constant at 2.01-2.04 eV,which causes their red *** best red-color quality(L*=37.13,a*=34.77,b*=29.44) is achieved when the pigment has a Dy^3+/Ce^3+molar ratio of 0.15,and the material maintains its excellent red color(L*=31.49 a*=30.94 b*=25.33) after being heated at 410℃ for 30 min.

关键词： γ-Ce2S3 Red pigment Co-precipitation Sr^2+,Dy^3+ co-doped Rare earths

The Breeding of a pigment Mutant Strain of Steroid Hydroxylation Aspergillus Flavus by Low Energy Ion Implantation

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Plasma Science and Technology 2009年第1期11卷 122-126页

作者：叶辉马金铭冯春程郢朱苏文程备久 Anhui Agricultural University University of Science and Technology of China

In the process of the fermentation of steroid C11α-hydroxylgenation strain Aspergillus flavus AF-ANo208, a red pigment is derived, which will affect the isolation and purification of the target product. Low energy ion beam implantation is a new tool for breeding excellent mutant strains. In this study, the ion beam implantation experiments were performed by infusing two different ions： argon ion （Ar^＋） and nitrogen ion （N^＋）. The results showed that the optimal ion implantation was N^＋ with an optimum dose of 2.08- 1015 ions/cm^2, with which the mutant strain AF-ANm16 that produced no red pigment was obtained. The strain had high genetic stability and kept the strong capacity of C11α-hydroxylgenation, which could be utilized in industrial fermentation. The differences between the original strain and the mutant strain at a molecular level were analyzed by randomly amplified polymorphic DNA （RAPD）. The results indicated that the frequency of variation was 7.00%, which would establish the basis of application investigation into the breeding of pigment mutant strains by low energy ion implantation.

关键词： ion implantation aspergillus flavus C11-αhydroxylgenation pigment RAPD

Synthesis and characterization of (Ni,Sb)-co-doped rutile ceramic pigment via mechanical activation-assisted solid-state reaction

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Particuology 2018年第6期16卷 20-29页

作者： Shi Zhang Zhidong Pan Yanmin Wang School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China

(Ni,Sb)-co-doped rutile yellow ceramic pigments were synthesized via a mechanical activation-assisted solid-state reaction in a stirred bead *** effects of mechanical grinding of the raw materials on the synthesis of (Ni,Sb)-co-doped rutile pigment were *** results show that mechanical activation effectively decreased the crystallinity of the mixed precursors,thus enhancing their reactivity and the migration rate of *** effects lowered the temperature required for formation of the rutile *** with results from a mixture of separately ground precursors,the mixture of raw materials ground together was more effective for accelerating nickel/antimony ions doping into the TiO2structure and improved the color performance of the *** pigment from the mixed raw materials ground for 2.0h and heat-treated at 1100℃ could be used as an environmentally-friendly ceramic yellow pigment owing to its low-toxicity,bright yellow hue,good chemical/thermal durability, and high cost-effectiveness.

关键词： Mechanical activation Solid-state synthesis (Ni,Sb)-co-doped rutile Ceramic pigment

Preparation of ternary rare earth sulfide La_xCe_(2-x)S_3 as red pigment

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Journal of Rare Earths 2013年第3期31卷 327-330页

作者：袁海滨张剑辉余瑞金苏锵 MOE Laboratory of Bioinorganic and Synthetic Chemistry State Key Laboratory of Optoelectronic Materials and TechnologiesSchool of Chemistry and Chemical EngineeringSun Yat-sen University Institute of Materials Science and Engineering Henan Polytechnic University

In order to investigate the suitability of ternary rare earth sulfide LanCe2 xS3 in plastic application as a red pigment, we prepared LaxCe2 xS3 via the sulfurization of the oxide powders using CS2 gas. In the sulfurization of LaxCe2_xS3, β-phase and y-phase ter- nary rare earth sulfide LaxCe2_xS3 were synthesized at the sulfufization temperature of 1000 and 1250 ℃ for 3 h, respectively. The UV-vis absorption spectra of synthesized LaxCe2_xS3 showed that the absorption wavelengths of 13-phase and y-phase LaxCe2_xS3 samies were in the region of 617-70 nm and 607-53 nm, respectively. They were in red absorption region. Furthermore, the scanning electron microscopy （SEM） results of the synthesized LaxCe2-S3 samples were investigated. The typical SEM microgmphs indicated that the particle sizes of synthesized LaxCe2 xS3 were in the range of 0.5-5 μm.

关键词： LaxCe2S3 ternary rare earth sulfide carbon disulfide UV-vis absorption spectra pigment

Influence of variables on the synthesis of CoFe_(2)O_(4)pigment by the complex polymerization method

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Journal of Advanced Ceramics 2015年第2期4卷 135-141页

作者： P.N.MEDEIROS Y.F.GOMES M.R.D.BOMIO I.M.G.SANTOS M.R.S.SILVA C.A.PASKOCIMAS M.S.LI F.V.MOTTA Department of Materials Engineering Federal University of Rio Grande do NorteCampus Lagoa NovaCEP 59078-900-Natal/RNBrazil Department of Chemistry Federal University of ParaíbaCidade UniversitáriaCEP 58051-900-João Pessoa/PBBrazi Institute Physics of São Carlos USPCEP 13566-590São CarlosSão PauloBrazil

Synthetic inorganic pigments are most widely used in ceramic applications due to their excellent chemical and thermal stability and their lower toxicity to both human and environment as *** the present work,black ceramic pigment CoFe_(2)O_(4)has been synthesized by the complex polymerization method(CPM)with good chemical *** order to study the influence of variables on the process of obtaining pigment through CPM,2^((5-2))fractional factorial design with resolution III was *** variables studied in the mathematical modeling were:citric acid/metal concentration,pre-calcination time,calcination temperature,calcination time,and calcination *** pigments were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),and UV-visible(UV-Vis)*** on the results,the formation of cobalt ferrite phase(CoFe_(2)O_(4))with spinel structure was *** color of pigments obtained showed dark shades,from black to *** model adjusted to the conditions proposed in this study due to the determination coefficient of 99.9%and variance(R²)showed that all factors are significant at the confidence level of 95%.

关键词： pigment complex polymerization method(CPM) fractional factorial design

Gaussian decomposition and component pigment spectral analysis of phytoplankton absorption spectra

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Journal of Oceanology and Limnology 2019年第5期37卷 1542-1554页

作者： YE Huping ZHANG Bing LIAO Xiaohan LI Tongji SHEN Qian ZHANG Fangfang ZHU Jianhua LI Junsheng State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Institute of Remote Sensing and Digital Earth Chinese Academy of SciencesBeijing 100094China National Ocean Technology Center Tianjin 300112China China-Sri Lanka Joint Research and Demonstration Center for Water Technology Chinese Academy of SciencesBeijing 100085China

The absorption spectrum of phytoplankton is an important bio-optical parameter for ocean color hyperspectral remote sensing;its magnitude and shape can be aff ected considerably by pigment composition and concentration. We conducted Gaussian decomposition to the absorption spectra of phytoplankton pigment and studied the spectral components of the phytoplankton, in which the package effect was investigated using pigment concentration data and phytoplankton absorption spectra. The decomposition results were compared with the corresponding concentrations of the five main pigment groups (chlorophylls a , b , and c , photo-synthetic carotenoids (PSC), and photo-protective carotenoids (PPC)). The results indicate that the majority of residual errors in the Gaussian decomposition are pigment concentrations (except for chlorophyll b) was 0.65 or greater for surface water samples at autumn cruise. In addition, we determined a strong predictive capability for chlorophylls a , c , PPC, and PSC. We also tested the estimation of pigment concentrations from the empirical specific absorption coeffi cient of pigment composition. The empirical decomposition showed that the Ficek model was the closest to the original spectra with the smallest residual *** pigment decomposition results and HPLC measurements of pigment concentration are in a high consistency as the scatter plots are distributed largely near the 1:1 line in spite of prominent seasonal variations. The Wozniak model showed a better fit than the Ficek model for Ch1 a , and the median relative error was small. The pigment component information estimated from the phytoplankton absorption spectra can help better remote sensing of hyperspectral ocean color that related to the changes in phytoplankton communities and varieties.

关键词： phytoplankton absorption spectrum pigment concentration Gaussian decomposition

Phytoplankton composition and its ecological effect in subsurface cold pool of the northern Bering Sea in summer as revealed by HPLC derived pigment signatures

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Acta Oceanologica Sinica 2014年第6期33卷 103-111页

作者： ZHUANG Yanpei JIN Haiyan LI Hongliang CHEN Jianfang WANG Bin CHEN Fajin BAI Youcheng LU Yong TIAN Shichao Laboratory of Marine Ecosystem and Biogeochemistry Second Institute of OceanographyState Oceanic Administration State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic Administration College of Ocean and Meteorology Guangdong Ocean University

CHEMTAX analysis of high-performance liquid chromatography （HPLC） pigment was conducted to study phytoplankton community structure in the northern Bering Sea shelf, where a seasonal subsurface cold pool emerges. The results showed that fucoxanthin （Fuco） and chlorophyll a （Chl a） were the most abundant diagnostic pigments, with the integrated water column values ranging from 141 to 2160 μg/m2 and 477 to 5 535 μg/m2, respectively. Moreover, a diatom bloom was identified at Sta. BB06 with the standing stock of Fuco up to 9214 μg/m3. The results of CHEMTAX suggested that the phytoplankton community in the northern Bering Sea shelf was dominated by diatoms and chrysophytes with an average relative contribu- tion to Chl a of 80% and 12%, respectively, followed by chlorophytes, dinoflagellates, and cryptophytes. Dia- toms were the absolutely dominant algae in the subsurface cold pool with a relative contribution exceeding 90%, while the contribution of chrysophytes was generally higher in oligotrophic upper water. Additionally, the presence of a cold pool would tend to favor accumulation of diatom biomass and a bloom that occurred beneath the halocline would be beneficial to organic matter sinks, which suggests that a large part of the phytoplankton biomass would settle to the seabed and support a rich benthic biomass.

关键词： pigment phytoplankton community structure CHEMTAX northern Bering Sea shelf subsurface cold pool

Spatial variability of summer and autumn phytoplankton community structure in Xiamen Western Bay based on pigment analysis

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Acta Oceanologica Sinica 2012年第5期31卷 165-175页

作者： HE Xuejia PENG Xingyue Research Center for Harmful Algae and Marine Biology Jinan UniversityGuangzhou 510632China School of Life Sciences Xiamen UniversityXiamen 361005China

The spatial variations of phytoplankton community structure in the Xiamen Western Bay during the summer and autumn cruises in 2001 were investigated based on HPLC analysis of photosynthetic pigments in algal cells and CHEMTAX processing of pigment data. The Chl a concentration reached 18.9 μg/L in the summer and declined to 0.28–2.17 in the autumn, respectively, consistent with the observation of diatom blooms in June. Among the accessory pigments, fucoxanthin was consistently the most abundant, ranging from 0.172 to 8.46 μg/L, with the maximum concentrations in June. 19’- hexfucoxanthin and alloxanthin were the other two abundant pigments in the summer and autumn. In addition, 19’-butanoyloxyfucoxanthin or peridinin was also important in late autumn. Generally the biomass of all the phytoplankton or each group was higher in the inner part than the mouth of this bay, represented by Chl a. CHEMTAX processing revealed the dominance of diatoms with their contribution of 14.6%–52.5% to the total Chl a, but its importance decreased in the autumn. Cryptophytes and Haptophytes, with an average contribution of 16.9%–31.4% and 12.1%–26.3%, were the other two important groups, especially in the autumn. On the contrary, Dinoflagellates and Chlorophytes were the minor groups, but the former became important sporadically in the autumn. It was suggested that there was distinctive variation in both the phytoplankton community structure and biomass between summer and autumn in the Xiamen Western Bay and the latter was coupled to the changes in temperature and dissolved oxygen. However, the spatial variation of the phytoplankton community structure was not as clear as the trend in the biomass of phytoplankton among all the sites in this bay.

关键词： phytoplankton pigment Xiamen Western Bay

Inhibition of Obtusifolin on retinal pigment epithelial cell growth under hypoxia

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International Journal of Ophthalmology(English edition) 2019年第10期12卷 1539-1547页

作者： Li-Fei Wang Zhong-Yang Yan Ya-Lin Li Yan-Hui Wang Sheng-Juan Zhang Xin Jia Lu Lu Yan-Xia Shang Xin Wang Yun-Huan Li Shan-Yu Li Fundus Surgery Ward Hebei Provincial Eye HospitalXingtai054001Hebei ProvinceChina Diabetic Eye Disease Ward Hebei Provincial Eye HospitalXingtai054001Hebei ProvinceChina Corneal Disease Ward Hebei Provincial Eye HospitalXingtai054001Hebei ProvinceChina

AIM: To explore the effect of Obtusifolin on retinal pigment epithelial cell growth under ***: In vitro chemical hypoxia model of ARPE-19 cells was established using cobalt chloride(CoCl2). Cell viability was tested by cell counting kit-8(CCK-8) assay. Western blot and real-time quantitative polymerase chain reaction were applied to detect proteins and mRNAs respectively. Flow cytometry was used to examine the cell cycle. Secretion of vascular endothelial growth factor(VEGF) was tested by using enzyme linked immunosorbent assay(ELISA).RESULTS: Under the chemical hypoxia model established by CoCl2, hypoxia inducible factor-1α(HIF-1α) mRNA and protein levels was up-regulated. Cell viability was increased and the proportion of S phase was higher. Obtusifolin could reduce cell viability under hypoxic conditions and arrest cells in G1 phase. Obtusifolin reduced the expression of Cyclin D1 and proliferating cell nuclear antigen(PCNA) in the hypoxic environment and increased the expression of p53 and p21. The levels of VEGF, VEGFR2 and eNOS proteins and mRNA were significantly increased under hypoxia while Obtusifolin inhibited the ***: Obtusifolin can inhibit cell growth under hypoxic conditions and down-regulate HIF-1/VEGF/eNOS secretions in ARPE-19 cells.

关键词： retinal pigment epithelial cells Obtusifolin vascular endothelial growth factor hypoxia