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Comparison of growth and lipid accumulation properties of two oleaginous microalgae under different nutrient conditions

Qiao ZHANG,Yu HONG

《环境科学与工程前沿(英文)》 2014年 第8卷 第5期   页码 703-709 doi: 10.1007/s11783-014-0649-x

摘要: This study compared the growth and lipid accumulation properties of two oleaginous microalgae, namely, sp. LX1 and sp. HQ, under different nutrient conditions. Both algal species obtained the highest biomass, lipid content and lipid yield under low-nutrient conditions (mBG11 medium). The biomass, lipid content and lipid yield of sp. LX1 were 0.42 g·L , 22.5% and 93.8 mg·L , respectively. These values were relatively higher than those of sp. HQ (0.30 g·L , 17.1% and 51.3 mg·L , respectively). These algae were then cultivated in an SE medium that contained more nutrients; as a result, the biomass and lipid yield of sp. LX1 reduced more significantly than those of sp. HQ. Opposite results were observed in lipid and triacylglycerols (TAGs) contents. The cell sizes of both algal species under low-nutrient conditions were larger than those under high-nutrient conditions. sp. HQ cells did not aggregate, but sp. LX1 cells flocculated easily, particularly under low-nutrient conditions. In summary, low-nutrient conditions favour the growth and lipid production of both algae, but sp. LX1 outperforms sp. HQ.

关键词: Scenedesmus sp. LX1     Chlorella sp. HQ     growth rate     algal biomass     lipid accumulation     triacylglycerols (TAGs)    

EXTRACTION AND EVALUATION OF EDIBLE OIL FROM SCHIZOCHYTRIUM SP. USING AN AQUEOUS ENZYMATIC METHOD

《农业科学与工程前沿(英文)》 2021年 第8卷 第4期   页码 623-634 doi: 10.15302/J-FASE -2021400

摘要:

Schizochytrium sp., a marine microalga, is a potential source of edible oil due to its short growth cycle and rapid lipid accumulation, especially of docosahexaenoic acid. An approach to isolate edible microalgal oil from Schizochytrium sp. using aqueous enzymatic extraction (AEE) was developed. Parameters were optimized by single-factor experiments followed by Box-Behnken design. Proteases were effective in extracting oil. The maximum free oil recovery (49.7%±0.58%) and total oil recovery (68.1%±0.94%) were obtained under optimum conditions of liquid-to-solid ratio of 4.8:1, a 2.5% enzyme concentration of papain and an extraction time of 2.2 h. There was a significant difference (P<0.05) in polyunsaturated fatty acid composition between microalgal oil obtained by AEE and by Soxhlet extraction, with the former having superior physiochemical properties and higher concentrations of bioactive components including total phenolic compounds and total tocopherols. These findings indicate a potential application of AEE for extraction of oil from Schizochytrium sp.

 

关键词: antioxidant activity / aqueous enzymatic extraction / edible microalgal oil / fatty acid composition / physicochemical properties    

Nitrogen distribution in the products from the hydrothermal liquefaction of sp. and sp.

《化学科学与工程前沿(英文)》 2022年 第16卷 第6期   页码 985-995 doi: 10.1007/s11705-021-2126-y

摘要: The high contents of nitrogen-containing organic compounds in biocrude obtained from hydrothermal liquefaction of microalgae are one of the most concerned issues on the applications and environment. In the project, Chlorella sp. and Spirulina sp. were selected as raw materials to investigate the influence of different reaction conditions (i.e., reaction temperature, residence time, solid loading rate) on the distribution of nitrogen in the oil phase and aqueous phase. Three main forms of nitrogen-containing organic compounds including nitrogen-heterocyclic compounds, amide, and amine were detected in biocrudes. The contents of nitrogen-heterocyclic compounds decreased with temperature while amide kept increasing. The effect of residence time on the components of nitrogen-containing organic compounds was similar with that of temperature. However, the influence of solid loading rate was insignificant. Moreover, it was also found that the differences of amino acids in the protein components in the two microalgae might affect the nitrogen distribution in products. For example, nitrogen in basic amino acids of Spirulina sp. preferred to go into the aqueous phase comparing with the nitrogen in neutral amino acids of Chlorella sp. In summary, a brief reaction map was proposed to describe the nitrogen pathway during microalgae hydrothermal liquefaction.

关键词: microalgae     hydrothermal liquefaction     biocrude     nitrogen distribution    

Cultivation of sp. HQ in inland saline-alkaline water under different light qualities

《环境科学与工程前沿(英文)》 2022年 第16卷 第4期 doi: 10.1007/s11783-021-1479-2

摘要:

• Optimal growth of Chlorella in inland saline-alkaline water was achieved by blue LED.

关键词: Light quality     Chlorella     Inland saline-alkaline water     Fatty acid     Biodiesel property    

of cultivation strategies on the cultivation of Chlorella sp.

Xiaoya Liu, Yu Hong, Peirui Liu, Jingjing Zhan, Ran Yan

《环境科学与工程前沿(英文)》 2019年 第13卷 第5期 doi: 10.1007/s11783-019-1162-z

摘要: Heterotrophic cultivation caused high level of ROS and high lipids accumulation. HMTC is the best culture strategy for improving the microalgal biomass. Chlorella sp. HQ had great nutrient removal capacity under five culture strategies. The effects of cultivation strategies (including autotrophic cultivation (AC), heterotrophic cultivation (HC), fed-batch cultivation (FC), heterotrophic+ autotrophic two-stage cultivation (HATC), and heterotrophic+ mixotrophic two-stage cultivation (HMTC)) on the growth and lipid accumulation of Chlorella sp. HQ and its total nitrogen (TN) and total phosphorus (TP) removal in secondary effluent were investigated in column photoreactors. The results showed that the TN and TP removal rates ranged between 93.72%–95.82% and 92.73%–100%, respectively, under the five different strategies. The microalgal growth potential evaluated by the maximal growth rate (Rmax) was in the order of HMTC>HC>FC>AC>HATC. The values of biomass, total lipid yield, triacylglycerols (TAGs) yield, and total lipid content of the microalga cultivated in the last 5 d increased significantly, but the TAGs productivities of the five strategies were lower than those in the first 7 d. Compared with all the other cultivation strategies, the TAGs productivity and yield after 12 d of cultivation under the heterotrophic condition reached the highest values accompanying the highest level of intracellular reactive oxygen species (ROS), in which the TAGs yield reached 40.81 mg/L at the end of the cultivation period. The peaks in TAGs yield and ROS level suggested that HC was beneficial for lipids accumulation via regulating the cellular redox status and exerting ROS stress on microalgal cells. In summary, HMTC was the best cultivation strategy for improving the microalgal biomass and HC was the best strategy for microalgal TAGs accumulation to produce biodiesel.

关键词: Chlorella sp. HQ     Cultivation strategy     lipids     Nitrogen removal     Phosphorus removal     Reactive oxygen species    

Studies on culture condition of new marine bacterium sp. SY01

LAN Wenjian, MO Linfeng, LI Houjin, CAI Chuanghua, ZHOU Yipin, YAO Junhua

《化学科学与工程前沿(英文)》 2008年 第2卷 第4期   页码 443-446 doi: 10.1007/s11705-008-0065-5

摘要: New marine bacterium sp. SY01, producer of prodigiosin, was isolated from the seawaters of Sanya Bay. The culture conditions of this bacterium were investigated. sp. SY01 was cultured in 2216E media which contained tryptophan, histidine, lactonic acid, camphor, limonene, casein, diphenyl guanidine, coumarin and 1,3-dinitrobenzene, respectively. After 5 days cultivation, the extracts of different culture broths were detected by direct infusion mass spectroscopy using positive ESI mode. As the results, tryptophan, histidine and casein didn’t show any observable influences on the biosynthesis of prodigiosin. Lactonic acid, camphor, limonene, diphenyl guanidine, coumarin could inhibit the bacterium growth and prodigiosin biosynthesis to a certain extent, slower the culture broth to turn red. However, 1, 3-dinitrobenzene inhibited the bacteria to produce prodigiosin completely. MS data suggested that various metabolites with chemodiversity were produced in different culture media. In particular, a series of high-molecular-weight compounds with high relative abundances were observed in the medium containing limonene. To further optimize the culture condition, more new prodigiosin analogues and lead compounds can be obtained and the goal of “one strain-many compounds” can be achieved.

关键词: producer     high-molecular-weight     relative     culture     different culture    

Formation of disinfection byproducts from accumulated soluble products of oleaginous microalga after chlorination

Yu Liu, Qiao Zhang, Yu Hong

《环境科学与工程前沿(英文)》 2017年 第11卷 第6期 doi: 10.1007/s11783-017-0938-2

摘要: When microalgae are simultaneously applied for wastewater treatment and lipid production, soluble algal products (SAP) should be paid much attention, as they are important precursors for formation of disinfection byproducts (DBPs), which have potential risks for human health. sp. HQ is an oleaginous microalga that can generate SAP during growth, especially in the exponential phase. This study investigated the contribution of SAP from sp. HQ to DBP formation after chlorination. The predominant DBP precursors from SAP were identified with the 3D excitation-emission matrix fluorescence. After chlorination, a significant reduction was observed in the fluorescence intensity of five specific fluorescence regions, particularly aromatic proteins and soluble microbial by-product-like regions, accompanied with slight shifting of the peak. The produced DBPs were demonstrated to include trihalomethanes and haloacetic acids. As the algal cultivation time was extended in wastewater, the accumulated SAP strengthened the formation of DBPs. The trend for DBP formation was as follows: chloroform>dichloroacetic acid>trichloroacetic acid.

关键词: Chlorella sp. HQ     Chlorination     Disinfection byproducts     Fluorescence spectroscopy     Soluble algal products    

Determination of heterozygosity for avirulence/virulence loci through sexual hybridization of

Yuan TIAN,Gangming ZHAN,Xia LU,Jie ZHAO,Lili HUANG,Zhensheng KANG

《农业科学与工程前沿(英文)》 2017年 第4卷 第1期   页码 48-58 doi: 10.15302/J-FASE-2016114

摘要: Wheat stripe rust caused by f. sp. is one of the most devastating diseases of wheat worldwide and resistant cultivars are vital for its management. Therefore, investigating the heterozygosity of the pathogen is important because of rapid virulence changes in isolates heterozygous for avirulence/virulence. An isolate of f. sp. was selfed on to determine the heterozygosity for avirulence/virulence loci. One hundred and twenty progeny isolates obtained from this selfing were phenotyped using 25 lines of wheat containing genes and genotyped with 96 simple sequencing repeat markers, with 51 pathotypes and 55 multi-locus genotypes being identified. All of these were avirulent on lines with , , , and and virulent on lines with , and , indicating that the parental isolate was homozygously avirulent or homozygously virulent for these loci. Segregation was found for wheat lines with , , , , , , , , , , , , , , , and . The 17 cultivars to which the was identified as heterozygous with respect to virulence/avirulence should not be given priority in breeding programs to obtain new resistant cultivars.

关键词: Puccinia striiformis f. sp. tritici     selfing     heterozygosity     virulence inheritance    

Biosorption of mercury and lead by aqueous

Pratibha SANJENBAM, Kumar SAURAV, Krishnan KANNABIRAN

《化学科学与工程前沿(英文)》 2012年 第6卷 第2期   页码 198-202 doi: 10.1007/s11705-012-1285-2

摘要: Toxic heavy metals are increasingly accumulating in the environment worldwide and are considered to be life threatening contaminants. The biosorption of mercury and lead by marine actinomycetes isolated from marine sediment collected from the Bay of Bengal coast of Puducherry, India, was evaluated. The maximum tolerance concentration (MTC) of sp. was determined by a well diffusion method and a broth dilution method. The effects of the initial metal ion concentration, the pH and the biomass dosage on the biosorption of mercury and lead ions were investigated. The MTC of the isolate to metals was 200 mg·L for mercury and 1800 mg·L for lead. At neutral pH, the isolate had a maximum biosorption of metal ions of 200 mg·L and 150 mg·L for mercury and lead respectively. Fourier transform infrared (FTIR) absorption spectra showed the chemical interactions between the functional groups in the biomass such as hydroxyl (-OH), amine (-NH ), carboxyl (-COOH) and the metal ions. The isolate was further characterized by molecular taxonomy and identified as a member of the genus Based on the phenotypic and phylogenetic analysis, the strain was classified as a new species of the genus and designated as VITSVK9 sp. (HM137310). A blast search of the 16S rDNA sequence of the strain showed the most similarity (95%) with sp. A515 Ydz-FQ (EU384279). Based on the results, it can be concluded that this marine could be used as a biosorbent for the removal of heavy metal ions from aqueous environments.

关键词: mercury     lead     biosorption     maximum tolerance concentration     Streptomyces VITSVK9 sp.    

Heterologous expression of

Di Li,Swati Yewalkar,Xiaotao Bi,Sheldon Duff,Dusko Posarac,Heli Wang,Layne A. Woodfin,Jan-Hendrik Hehemann,Sheila C. Potter,Francis E. Nano

《环境科学与工程前沿(英文)》 2017年 第11卷 第2期 doi: 10.1007/s11783-017-0910-1

摘要: Maximum growth rate of mutant was 0.083 h with 5% CO . Maximum biomass concentration of mutant was 3.697 g·L . mutant can tolerate gas aeration with 15% CO . Maximum specific activity of laminarinase was 4.325 U·mg dry mass. Optimal pH and temperature of laminarinase activity were 8.0 and 70°C. The gene for the catalytic domain of thermostable endo-β-1,3-glucanase (laminarinase) LamA was cloned from Thermotoga maritima MSB8 and heterologously expressed in a bioengineered Synechococcus sp. PCC 7002. The mutant strain was cultured in a photobioreactor to assess biomass yield, recombinant laminarinase activity, and CO2 uptake. The maximum enzyme activity was observed at a pH of 8.0 and a temperature of 70°C. At a CO2 concentration of 5%, we obtained a maximum specific growth rate of 0.083 h , a biomass productivity of 0.42 g·L ·d , a biomass concentration of 3.697 g·L , and a specific enzyme activity of the mutant strain of 4.325 U·mg dry mass. All parameters decreased as CO2 concentration increased from 5% to 10% and further to 15% CO2, except enzyme activity, which increased from 5% to 10% CO2. However, the mutant culture still grew at 15% CO2 concentration, as reflected by the biomass productivity (0.26 g·L ·d ), biomass concentration (2.416 g·L ), and specific enzyme activity (3.247 U·mg dry mass).

关键词: Synechococcus sp. PCC 7002     Thermotoga maritima     LamA gene     Endo-β-1     3-glucanase     CO2 fixation    

In situ enhanced bioremediation of dichlorvos by a phyllosphere

Jiying NING, Gang GANG, Zhihui BAI, Qing HU, Hongyan QI, Anzhou MA, Xuliang ZHUAN, Guoqiang ZHUANG

《环境科学与工程前沿(英文)》 2012年 第6卷 第2期   页码 231-237 doi: 10.1007/s11783-011-0316-4

摘要: A bacterium capable of degrading dichlorvos was isolated from the rape phyllosphere and designated YD4. The strain was identified as sp., based on its phenotypic features and 16S rRNA gene sequence. Strain YD4 was able to utilize dichlorvos as the sole source of phosphorus. enhanced bioremediation of dichlorvos by YD4 was hereafter studied. Chlorpyrifos and phoxim could also be degraded by this strain as the sole phosphorus source. A higher degradation rate of dichlorvos was observed after spraying YD4 onto the surface of rape leaves when compared to the sterilized-YD4 and water-treated samples. The results indicated that pesticide-degrading epiphytic bacterium could become a new way for phyllosphere bioremediation where the hostile niche is unsuitable for other pesticide-degrading bacteria isolated from soil and water.

关键词: enhanced bioremediation     organophosphorus pesticides     phyllosphere     Flavobacterium sp.    

Carbon dioxide fixation by

Xuan JIA, Hai YAN, Zijing WANG, Huanju HE, Qianqian XU, Haiou WANG, Chunhua YIN, Liqin LIU

《环境科学与工程前沿(英文)》 2011年 第5卷 第3期   页码 402-408 doi: 10.1007/s11783-010-0223-0

摘要: A promising microalgal strain isolated from fresh water, which can grow both autotrophically on inorganic carbon under lighting and heterotrophically on organic carbon without lighting, was identified as sp. USTB-01 with the phylogenetic analysis based on 18S ribosomal ribonucleic acid (rRNA) gene sequences. In the heterotrophic batch culture, more than 20.0 g·L of cell dry weight concentration (DWC) of sp. USTB-01 was obtained at day 5, and which was used directly to seed the autotrophic culture. A novel fermentor-helical combined photobioreactor was established and used to cultivate sp. USTB-01 for the fixation of carbon dioxide (CO ). It showed that the autotrophic growth of sp. USTB-01 in the combined photobioreactor was more effective than that in the fermentor alone and the maximum DWC of 2.5 g·L was obtained at day 6. The highest CO fixation of 95% appeared on day 1 in the exponential growth phases of sp. USTB-01 and 49.8% protein was found in the harvested microalgal cells.

关键词: Chlorella sp. USTB-01     carbon dioxide fixation     combined photobioreactor    

New insights in the battle between wheat and

Chunlei TANG,Xiaojie WANG,Yulin CHENG,Minjie LIU,Mengxin ZHAO,Jinping WEI,Zhensheng KANG

《农业科学与工程前沿(英文)》 2015年 第2卷 第2期   页码 101-114 doi: 10.15302/J-FASE-2015068

摘要: Wheat stripe rust caused by f. sp. ( ) poses a great threat to wheat production worldwide. The rapid change in virulence of leads to a loss of resistance in currently resistant wheat cultivars, which results in frequent disease epidemics. Therefore, a major focus is currently placed on investigating the molecular mechanisms underlying this rapid variation of pathogenicity and coevolving wheat resistance. Limited by the lack of a system for stable transformation of and the difficulties in wheat transformation, it is not easy to generate deeper insights into the wheat- interaction using established genetic methods. Nevertheless, considerable effort has been made to unravel the wheat- interaction and significant progress is being made. Histology and cytology have revealed basic details of infection strategies and defense responses during wheat- interactions, identified cellular components involved in wheat- interactions, and have helped to elucidate their role in the infection process or in plant defense responses. Transcriptome and genome sequencing has revealed the molecular features and dynamics of the wheat- pathosystem. Extensive molecular analyses have led to the identification of major components in the wheat resistance response and in virulence. Studies of wheat- interactions have now entered a new phase in which cellular and molecular approaches are being used. This review focuses on the cellular biology of wheat- interactions and integrates the emerging data from molecular analyses with the histocytological observations.

关键词: wheat     strip rust     Puccinia striiformis f. sp. tritici     host defense     pathogen virulence     biotrophic fungus    

甘油诱导的鼠李糖脂增强伯克霍尔德菌属C3中二苯并噻吩的生物降解 Article

Camila A. Ortega Ramirez, Abraham Kwan, Qing X. Li

《工程(英文)》 2020年 第6卷 第5期   页码 533-540 doi: 10.1016/j.eng.2020.01.006

摘要: 利用甘油刺激伯克霍尔德菌属C3(Burkholderia sp.在甘油与DBT最佳摩尔比的情况下,实验第1天,DBT的生物降解速率常数与单独使用DBT培养基相比提高了18倍,DBT的生物降解率提高了25%~30%。

关键词: 生物降解     生物修复     生物表面活性剂     生物转化     甘油     微生物代谢     鼠李糖脂    

Dewatering of Scenedesmus Obliquus Cultivation Substrate with Microfiltration: Potential and Challenges

Marco Malaguti,Lorenzo Craveri,Francesco Ricceri,Vincenzo Riggio,Mariachiara Zanetti,Alberto Tiraferri,

《工程(英文)》 doi: 10.1016/j.eng.2023.07.010

摘要: In the microalgae harvesting process, which includes a step for dewatering the algal suspension, directly reusing extracted water in situ would decrease the freshwater footprint of cultivation systems. Among various algae harvesting techniques, membrane-based filtration has shown numerous advantages. This study evaluated the reuse of permeate streams derived from Scenedesmus obliquus (S. obliquus) biomass filtration under bench-scale and pilot-scale conditions. In particular, this study identified a series of challenges and mechanisms that influence the water reuse potential and the robustness of the membrane harvesting system. In a preliminary phase of this investigation, the health status of the initial biomass was found to have important implications for the harvesting performance and quality of the permeate stream to be reused; healthy biomass ensured better dewatering performance (i.e., higher water fluxes) and higher quality of the permeate water streams. A series of bench-scale filtration experiments with different combinations of cross-flow velocity and pressure values were performed to identify the operative conditions that would minimize energy requirements while maximizing water productivity. The optimal conditions, 2.2 m·s−1 and 1.4 bar (1 bar = 105 Pa), respectively, were then applied to drive pilot-scale microfiltration tests to reuse the collected permeate as a new cultivation medium for S. obliquus growth in a pilot-scale photo-bioreactor. The investigation revealed key differences between the behavior of the membrane systems at the two scales (bench and pilot). It indicated the potential for beneficial reuse of the permeate stream as the pilot-scale experiments ensured high harvesting performance and growth rates of biomass in permeate water that were highly similar to those recorded in the ideal cultivation medium. Finally, different nutrient reintegration protocols were investigated, revealing that both macro- and micronutrient levels are critical for the success of the reuse approach.

关键词: Scenedesmus obliquus     Microfiltration     Permeate reuse     Harvesting     Microalgae     Pilot-scale    

标题 作者 时间 类型 操作

Comparison of growth and lipid accumulation properties of two oleaginous microalgae under different nutrient conditions

Qiao ZHANG,Yu HONG

期刊论文

EXTRACTION AND EVALUATION OF EDIBLE OIL FROM SCHIZOCHYTRIUM SP. USING AN AQUEOUS ENZYMATIC METHOD

期刊论文

Nitrogen distribution in the products from the hydrothermal liquefaction of sp. and sp.

期刊论文

Cultivation of sp. HQ in inland saline-alkaline water under different light qualities

期刊论文

of cultivation strategies on the cultivation of Chlorella sp.

Xiaoya Liu, Yu Hong, Peirui Liu, Jingjing Zhan, Ran Yan

期刊论文

Studies on culture condition of new marine bacterium sp. SY01

LAN Wenjian, MO Linfeng, LI Houjin, CAI Chuanghua, ZHOU Yipin, YAO Junhua

期刊论文

Formation of disinfection byproducts from accumulated soluble products of oleaginous microalga after chlorination

Yu Liu, Qiao Zhang, Yu Hong

期刊论文

Determination of heterozygosity for avirulence/virulence loci through sexual hybridization of

Yuan TIAN,Gangming ZHAN,Xia LU,Jie ZHAO,Lili HUANG,Zhensheng KANG

期刊论文

Biosorption of mercury and lead by aqueous

Pratibha SANJENBAM, Kumar SAURAV, Krishnan KANNABIRAN

期刊论文

Heterologous expression of

Di Li,Swati Yewalkar,Xiaotao Bi,Sheldon Duff,Dusko Posarac,Heli Wang,Layne A. Woodfin,Jan-Hendrik Hehemann,Sheila C. Potter,Francis E. Nano

期刊论文

In situ enhanced bioremediation of dichlorvos by a phyllosphere

Jiying NING, Gang GANG, Zhihui BAI, Qing HU, Hongyan QI, Anzhou MA, Xuliang ZHUAN, Guoqiang ZHUANG

期刊论文

Carbon dioxide fixation by

Xuan JIA, Hai YAN, Zijing WANG, Huanju HE, Qianqian XU, Haiou WANG, Chunhua YIN, Liqin LIU

期刊论文

New insights in the battle between wheat and

Chunlei TANG,Xiaojie WANG,Yulin CHENG,Minjie LIU,Mengxin ZHAO,Jinping WEI,Zhensheng KANG

期刊论文

甘油诱导的鼠李糖脂增强伯克霍尔德菌属C3中二苯并噻吩的生物降解

Camila A. Ortega Ramirez, Abraham Kwan, Qing X. Li

期刊论文

Dewatering of Scenedesmus Obliquus Cultivation Substrate with Microfiltration: Potential and Challenges

Marco Malaguti,Lorenzo Craveri,Francesco Ricceri,Vincenzo Riggio,Mariachiara Zanetti,Alberto Tiraferri,

期刊论文