Optimization of key factors affecting hydrogen production from coffee waste using factorial design and metagenomic analysis of the microbial community

Montoya, Alejandra Carolina Villa; Mazareli, Raissa Cristina da Silva; Delforno, Tiago Palladino; Centurion, Victor Borin; Oliveira, Valéria Maia de; Silva, Edson Luiz; Varesche, Maria Bernadete Amâncio

doi:10.1016/j.ijhydene.2019.12.062

Cited by 46 publications

(22 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Many researchers and specialists in the field of measurement and evaluation, are interested in the basic concepts and organizational theoretical frameworks of measurement and evaluation and ways to apply them [9][10][11], due to the great role this science plays in various fields of scientific research in general and educational and psychological research in particular. Research activity according to the needs of educational institutions will positively affect development and improvement in accordance with Saudi Arabia's Vision 2030.…”

Section: Introductionmentioning

confidence: 99%

Examinee Characteristics and their Impact on the Psychometric Properties of a Multiple Choice Test According to the Item Response Theory (IRT)

Almaleki

2021

Eng. Technol. Appl. Sci. Res.

View full text Add to dashboard Cite

The aim of the current study is to provide improvement evaluation practices in the educational process. A multiple choice test was developed, which was based on content analysis and the test specification table covered some of the vocabulary of the applied statistics course. The test in its final form consisted of 18 items that were reviewed by specialists in the field of statistics to determine their validity. The results determine the relationship between individual responses and the student ability. Most thresholds span the negative section of the ability. Item information curves show that the items provide a good amount of information about a student with lower or moderate ability compared to a student with high ability. In terms of precision, most items were more convenient with lower ability students. The test characteristic curve was plotted according to the change in the characteristics of the examinees. The information obtained by female students appeared to be more than the information obtained by male students and the test provided more information about students who were not studying statistics in an earlier stage compared with students who did. This test clearly indicated that, based on the level of the statistics course, there should be a periodic review of the tests in line with the nature and level of the course materials in order to have a logical judgment about the level of the students’ progress at the level of their ability.

show abstract

Section: Introductionmentioning

confidence: 99%

Examinee Characteristics and their Impact on the Psychometric Properties of a Multiple Choice Test According to the Item Response Theory (IRT)

Almaleki

2021

Eng. Technol. Appl. Sci. Res.

View full text Add to dashboard Cite

show abstract

“…isolated from banana waste [ 14 ] and improved hydrogen production by bioaugmentation with thermophiles exampled by Thermoanaerobacterium thermosaccharolyticum used to enhance thermophilic hydrogen production from corn stover hydrolysate [ 15 ]. The use of consortia of these groups of microorganisms, derived either as endogenous species isolated from biomass or from other environmental sources and used to augment the natural microbial flora has also proved a successful strategy [ [16] , [17] , [18] , [19] , [20] ]. However, the photofermentative processes involved in hydrogen production performed by the PNS group (represented by R. sphaeroides but also including Rhodopseudomonas capsulatus , R. palustris and Rhodospirillum rubrum ), has attracted more attention because of the higher conversion efficiency and yields expected from the conversion of substrate to hydrogen and the abilities to utilise food industry wastes and solar light energy of wide ranging wavelengths (522–860 nm) [ 1 , 3 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

The adherence-associated Fdp fasciclin I domain protein of the biohydrogen producer Rhodobacter sphaeroides is regulated by the global Prr pathway

Jeong

Broad

Moody

et al. 2020

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Expression of fdp, encoding a fasciclin I domain protein important for adherence in the hydrogen-producing bacterium Rhodobacter sphaeroides, was investigated under a range of conditions to gain insights into optimization of adherence for immobilization strategies suitable for H 2 production. The fdp promoter was linked to a lacZ reporter and expressed in wild type and in PRRB and PRRA mutant strains of the Prr regulatory pathway. Expression was significantly negatively regulated by Prr under all conditions of aerobiosis tested including anaerobic conditions (required for H 2 production), and aerobically regardless of growth phase, growth medium complexity or composition, carbon source, heat and cold shock and dark/light conditions. Negative fdp regulation by Prr was reflected in cellular levels of translated Fdp protein. Since Prr is required directly for nitrogenase expression, we propose optimization of Fdp-based adherence in R. sphaeroides for immobilized biohydrogen production by inactivation of the PrrA binding site(s) upstream of fdp .

show abstract

“…O uso de biocombustíveis, como o biogás, seria indicado para substituição dos combustíveis oriundos do petróleo (MARQUES et al, 2013). Sua obtenção vem sendo estudada a partir de diversos inóculos e substratos, como resíduos alimentícios de restaurantes (MASIH-DAS;TAO, 2018;JIANG et al, 2019), bagaço de cana-de-açúcar (LEITÃO et al, 2013;AHMAD et al, 2018;RABELO et al, 2018a;), banana (MAZARELI et al, 2020, resíduos do processamento de café (VILLA MONTOYA et al, 2020) e também os resíduos do processamento de citros (FORGÁCS et al, 2012;CALABRÒ et al, 2016;SU;TAN;XU, 2016).…”

Section: Biorrefinarias E Bioprodutosunclassified

“…Recentemente, a estratégia de uso de inóculos autofermentativo aplicados a material celulósico/lignocelulósico, conciliado a consórcios alóctones a fim de potencializar a obtenção de biogás (CH4 e/ou H2) vem sendo amplamente difundida (BRAGA et al, 2018;RABELO et al, 2018a;MAZARELI et al, 2020;SOARES et al, 2020;VILLA MONTOYA et al, 2020). Desta forma, optou-se por utilizar consórcio complexo, sendo uma mistura de bactérias autóctones/endógenas dos resíduos de citros, provavelmente, adaptadas a seus potenciais inibidores e capazes de utilizar este resíduo complexo como substrato, aliado ao consórcio alóctone, rico em bactérias fermentativas produtoras de biogás, como o lodo de reator UASB.…”

Section: Inóculo Alóctoneunclassified

See 1 more Smart Citation

Caracterização taxônomica e funcional da comunidade microbiana envolvida na obtenção de biogás e outros compostos de interesse biotecnológico a partir de resíduos do processamento de citros/laranja

Camargo¹

View full text Add to dashboard Cite

Aqueles que realizaram um doutorado sabem que nem sempre é fácil ou divertido, e que, definitivamente, não é possível ter sucesso sem muito apoio, ajuda, orientação, compreensão, companheirismo e incentivo das pessoas a seu redor. Mas estes sabem também que poucas coisas neste caminho são mais gratificantes que olhar para trás e ver que nada disso ficou em falta. Aproveito esta seção para humildemente mencionar as pessoas que me proporcionaram este enorme sentimento de gratidão. À minha orientadora, Prof. Dr. Maria Bernadete Amâncio Varesche, pela confiança depositada em mim ao longo dos anos, correção minuciosa dos trabalhos e apoio nas dificuldades enfrentadas ao longo da pesquisa. À minha co-orientadora, Prof. Dr. Iolanda Silveira Duarte, a todo o auxílio prestado e a recomendação à Prof. Bernadete. Ao Prof. Dr.Edson Luiz Silva (Tininho), a grande participação em minha pesquisa e colaboração ao longo do processo de escrita.Ao imensurável apoio técnico de Maria Ângela Adorno, Carolina Sabatini, Isabel Sakamoto, Eloisa Pozzi, Juliana Custódio e Fernando Moura, por toda ajuda, colaborações e agradável convivência nestes anos. Aos professores do Laboratório de Processos Biológicos (LPB), Prof. Dr. Eugênio Foresti e Marcelo Zaiat, as enriquecedoras discussões durante as pausas para o café.

show abstract

Optimization of key factors affecting hydrogen production from coffee waste using factorial design and metagenomic analysis of the microbial community

Cited by 46 publications

References 65 publications

Examinee Characteristics and their Impact on the Psychometric Properties of a Multiple Choice Test According to the Item Response Theory (IRT)

Examinee Characteristics and their Impact on the Psychometric Properties of a Multiple Choice Test According to the Item Response Theory (IRT)

The adherence-associated Fdp fasciclin I domain protein of the biohydrogen producer Rhodobacter sphaeroides is regulated by the global Prr pathway

Caracterização taxônomica e funcional da comunidade microbiana envolvida na obtenção de biogás e outros compostos de interesse biotecnológico a partir de resíduos do processamento de citros/laranja

Contact Info

Product

Resources

About