Different approaches have been established for applications of social and complex networks involving biological systems, passing through collaborative systems in knowledge networks and organizational systems. In this ...Different approaches have been established for applications of social and complex networks involving biological systems, passing through collaborative systems in knowledge networks and organizational systems. In this latter application, we highlight the studies focused on the diffusion of information and knowledge in networks. However, most of the time, the propagation of information in these networks and the resulting process of creation and diffusion of knowledge, have been studied from static perspectives. Additionally, the very concept of diffusion inevitably implies the inclusion of the temporal dimension, due to that it is an essentially dynamic process. Although static analysis provides an important perspective in structural terms, the behavioral view that reflects the evolution of the relationships of the members of these networks over time is best described by temporal networks. Thus, it is possible to analyze both the information flow and the structural changes that occur over time, which influences the dynamics of the creation and diffusion of knowledge. This article describes the computational modeling used to elucidate the creation and diffusion of knowledge in temporal networks formed to execute software maintenance and construction projects, for the period between 2007 and 2013, in the SERVIÇO FEDERAL DE PROCESSAMENTO DE DADOS (FEDERAL DATA PROCESSING SERVICE-SERPRO)—a public organization that provides information and communication technology services. The methodological approach adopted for the study was based on techniques for analyzing social and complex networks and on the complementary extensions that address temporal modeling of these networks. We present an exploratory longitudinal study that enabled a dynamic and structural analysis of the knowledge networks formed by members of software maintenance and development project teams between 2007 and 2013. The study enabled identification of knowledge categories throughout this period, in addition to the determination that the networks have a structure with small-world and scale-free models. Finally, we concluded that, in general, the topologies of the networks studies had characteristics for facilitating the flow of knowledge within the organization.展开更多
An understanding of the knowledge creation and diffusion process in the organizational context is extremely relevant. Because from this understanding, organizations can restructure processes, reorient teams and implem...An understanding of the knowledge creation and diffusion process in the organizational context is extremely relevant. Because from this understanding, organizations can restructure processes, reorient teams and implement methodologies to assist in the construction of an evolutionary process of knowledge creation and diffusion aimed at sustainable growth and innovation. The theory of complex social networks has been applied in several fields to help understand organizational cognitive processes. However, these approaches still insipiently consider the analysis of the nestedness and modularity of the studied networks. In this article, we presented an approach that sought to identify patterns of nestedness and modularity in networks of affiliation of people in projects in the organizational context. The study sought to identify these patterns in affiliation networks in a public organization providing information technology services in the period from 2006 to 2013. The detection of these patterns was performed using the NODF (Nestedness metric based on Overlap and Decreasing Fill) algorithm described by <a href="#ref1">[1]</a>. The nestedness and modularity metrics can influence patterns of knowledge creation and diffusion in formal and informal networks constituted for the execution of projects in organizations. This study showed that the network structures of the organization during the study period presented a high degree of nestedness, and it was possible to identify combined structures of nestedness and modularity.展开更多
This work presents an approach to study the diffusion of knowledge in software development project teams based on the formation of complex social network structures in a public organization that offers information and...This work presents an approach to study the diffusion of knowledge in software development project teams based on the formation of complex social network structures in a public organization that offers information and communication technology services. We collected historical data on the allocation and records of hours worked by people in projects to build an affiliation network. We applied the method of reflections to analyze the data obtained. The constructed model enabled the description of the participation of project team members from the perspective of the creation and diffusion of knowledge in affiliation networks that describe the participation of people in projects, mediated by the knowledge and the capabilities developed for the execution of these projects. A contribution of this work is the construction of indicators related to the process of creation and diffusion of knowledge in the context of the execution of software development and maintenance projects, based on the concepts of diversification and ubiquity applied to the process of knowledge diffusion;an additional contribution is the presentation of an application of the method of reflections in an organizational context applied to the creation and diffusion of knowledge. We found that the application of management models associated with the collaborative method applied to the project development process contributed to the joint growth of diversified and more specialized knowledge alongside the knowledge considered more generic and ubiquitous. Our results show that contrary </span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">to </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">previous expectations based on assumptions established at the beginning of the study, we concluded that in six of the seven subnetworks obtained in the period between 2007 and 2013, knowledge based on complex and diversified capabilities showed a growth proportional to the growth of knowledge related to the capabilities necessary to more general and ubiquitous activities.展开更多
Currently, the collaboration in scientific communities has been studied in order to explain, among other things, the knowledge diffusion. The quality of Graduate Programmes is often associated with the scientific coll...Currently, the collaboration in scientific communities has been studied in order to explain, among other things, the knowledge diffusion. The quality of Graduate Programmes is often associated with the scientific collaboration. This paper discusses how scientific collaboration processes can be identified and characterized through social and complex networks. For this purpose, collaboration networks of bibliographic production, research projects, and committees of PhD theses and Masters’ dissertations by researchers from a graduate program in computational modeling were studied. The data were obtained from CAPES’ reports of the period from 2001 to 2009. Among the studied indices, centrality indices indicate the presence of prominent researchers who influence others and promptly interact with other researchers in the network. The indices of complex networks reveal the presence of the small-world (i.e. these networks are favorable to increase coordination between researchers) phenomenon and indicate a behavior of scale-free degree distribution (i.e. some researchers promote clustering more than others) for one of the studied networks.展开更多
Visualization methods for single documents are either too simple, considering word frequency only, or depend on syntactic and semantic information bases to be more useful. This paper presents an intermediary approach,...Visualization methods for single documents are either too simple, considering word frequency only, or depend on syntactic and semantic information bases to be more useful. This paper presents an intermediary approach, based on H. P. Luhn’s automatic abstract creation algorithm, and intends to aggregate more information to document visualization than word counting methods do without the need of external sources. The method takes pairs of relevant words and computes the linkage force between them. Relevant words become vertices and links become edges in the resulting graph.展开更多
In project-based organizations knowledge is a critical resource used to develop and deliver products and services with a high level of quality. Therefore, a systematic and sustainable process is necessary to coordinat...In project-based organizations knowledge is a critical resource used to develop and deliver products and services with a high level of quality. Therefore, a systematic and sustainable process is necessary to coordinate knowledge management, project management and product lifecycle. This scenario predominates in companies focused on the creation and maintenance of information systems. This article presents an exploratory study based on a framework that integrates cognitive, managerial, and operational processes in a public Brazilian organization that provides services in the area of information and communications technology, focusing on the construction and maintenance of information systems. Those processes are operationalized by three management models considering knowledge, project, and software development processes. Our proposal aims to understand the relationships between those three management models and their influence on the software development process in the organization under study. Our premise is based on the principle that cognitive management, project management, and software development management must be integrated to fulfill the demands of product development and service provision. The research data was composed of registers of working hours spent on software development and maintenance projects involving 244 people allocated to 5064 projects in the period from 2007 to 2013. The study resulted in the identification of the relationships among the three management models adopted by the organization, with emphasis on knowledge management activities, which were not directly identified, making it difficult to account for and measure them. We established a set of activities connected to each one of the knowledge management model phases. Since those activities were not visible before, our approach contributed to build a systematic process to register and relate activities linked to the dimensions of cognitive processes, project management, and software construction.展开更多
This work aimed to elucidate the key research findings within the realm of NetZero,specifically within the energy field.Employing advanced data visualization tools,particularly VOSviewer,scientific maps were meticulou...This work aimed to elucidate the key research findings within the realm of NetZero,specifically within the energy field.Employing advanced data visualization tools,particularly VOSviewer,scientific maps were meticulously crafted to explain the evolving landscape of research in this domain.The results showed that the nations that most vigorously committed to the NetZero endeavor are the United Kingdom,United States,China,Australia,and Canada,signaling a global consensus on the urgency of addressing climate change.Furthermore,this study reveals pivotal trends in the field and keywords such as“renewable energy”,“decarbonization”,“netzero”,and“sustainability”have gained remarkable prominence,especially in recent research.In conclusion,this work offers a comprehensive overview of the NetZero landscape within the energy field,emphasizing the urgency of international collaboration,and identifies key trends that will likely shape the future of sustainable energy research and policymaking.展开更多
The Education through Work for Family Health Program (PET Saúde, in Portuguese) created by the Ministries of Education and Health is a proposal to integrate service, learning and community. The goal of PET Sa...The Education through Work for Family Health Program (PET Saúde, in Portuguese) created by the Ministries of Education and Health is a proposal to integrate service, learning and community. The goal of PET Saúde is to foster the formation of learning groups within the Family Health Strategy scope. While being studied at the city of Feira de Santana, the program was structured with one coordinator and eleven tutorial groups, distributed in 27 family health offices, which constituted a social network where the construction and knowledge diffusion occur. This article proposes the analysis of the information and knowledge flows of this network through the social networks analysis. This study highlights the play of PET Saúde’s coordinator in the processes of organization and articulation as central vertex of the network, and some scholars in the articulation of different tutorial groups. The results show a fragmentation in the PET Saúde network when the coordinator vertex is removed, whereas 5 components are generated where 4 tutorial groups appear isolated.展开更多
Coauthorship networks consist of links among groups of mutually connected authors that form a clique. Classical approaches using Social Network Analysis indices do not account for this characteristic. We propose two n...Coauthorship networks consist of links among groups of mutually connected authors that form a clique. Classical approaches using Social Network Analysis indices do not account for this characteristic. We propose two new cohesion indices based on a clique approach, and we redefine the network density using an index of variance of density. We have applied these indices to two coauthorship networks, one comprising researchers that published in Mathematics Education journals and the other comprising researchers from a Computational Modeling Graduate Program. A contextualized and comparative analysis was performed to show the applicability and potential of the indices for analyzing social networks data.展开更多
The use of computational intelligence has become commonplace for accurate wind speed and energy forecasting,however the energy-intensive processes involved in training and tuning stands as a critical issue for the sus...The use of computational intelligence has become commonplace for accurate wind speed and energy forecasting,however the energy-intensive processes involved in training and tuning stands as a critical issue for the sustainability of AI models.Quantum computing emerges as a key player in addressing this concern,offering a quantum advantage that could potentially accelerate computations or,more significantly,reduce energy consumption.It is a matter of debate if purely quantum machine learning models,as they currently stand,are capable of competing with the classical state of the art on relevant problems.We investigate the efficacy of quantum neural networks(QNNs)for wind speed nowcasting,comparing them to a baseline Multilayer Perceptron(MLP).Utilizing meteorological data from Bahia,Brazil,we develop a QNN tailored for up to six hours ahead wind speed prediction.Our analysis reveals that the QNN demonstrates competitive performance compared to MLP.We evaluate models using RMSE,Pearson’s R,and Factor of 2 metrics,emphasizing QNNs’promising generalization capabilities and robustness across various wind prediction scenarios.This study is a seminal work on the potential of QNNs in advancing renewable energy forecasting,advocating for further exploration of quantum machine learning in sustainable energy research.展开更多
Stingless bees(SLB)are insects bread many centuries ago by indigenous people and more than 500 species have already been described.Interest in SLB’s propolis has grown as a way to value and preserve native bees,in ad...Stingless bees(SLB)are insects bread many centuries ago by indigenous people and more than 500 species have already been described.Interest in SLB’s propolis has grown as a way to value and preserve native bees,in addition to investigating/prospecting compounds with biological functionality(antimicrobial activity,antioxidant,etc.).The natural active compounds found in propolis come from different plant sources,and consequently,each propolis may show unique biological/pharmacological activity.There is still an important gap about the profile of chemical compounds,biological and pharmacological potential of propolis produced by SLBs.This work aimed to investigate the presence of phenolic and coumaric compounds(HPLC-DAD-FLD)and the antimicrobial activity(microdilution method)of propolis extracts from five different species of SLB reared in different places.The samples from Melipona quadrifasciata(82.05 mgGAEg^(−1))and one from,Frieseomelitta doederleini(56.22 mgGAEg^(−1))showed the highest concentrations of phenolic compounds.It was possible to identify in the propolis samples formononetin,kaempferol,gallic acid and coumarin.Resveratrol was detected in all samples,an unprecedent fact for SLB propolis.Candida albicans was susceptible to all tested extracts,while Escherichia coli was inhibited only by propolis from Melipona quadrifas-ciata;Enterococcus faecalis was inhibited by propolis from Plebeiadroryana.,Melipona quadrifasciata and Frieseomelitta doederleini.It was verified that SLB propolis constitutes a source of different biocompounds,which varies according to the location where the bees are raised,and has mainly antifungal activity,generating possibilities of its use in different biotechnological products.展开更多
The breeding of stingless bees, known as meliponiculture, can be found throughout the world, and is closely linked tothe history of the first human communities in the Americas. This activity provides products of indus...The breeding of stingless bees, known as meliponiculture, can be found throughout the world, and is closely linked tothe history of the first human communities in the Americas. This activity provides products of industrial interest (food,cosmetics, pharmaceuticals), and among them propolis stands out. This matrix is a resinous material but being difficultto classify and conceptualize due to its variability according to the environment and producing species. The propolisproduced by these bees is a source of compounds with nutritional and functional potential, but the main interestis focused on the phenolic compounds. This potential makes propolis a product that can be used in the prospectionof new molecules with antimicrobial and antioxidant activity. Thus, the scientific literature describes propolis activity(generally extracts) against bacteria and fungi, but with a higher microbicidal activity against gram-positive bacteria.The high antioxidant activity of this bee product is a consequence of the presence of several phenolic compounds.The use of propolis from SBP (Stingless bee propolis) is still quite limited, generally restricted to its antioxidant potential, but studies with application in other sectors can benefit this productive sector, as with the propolis produced bythe bee Apis mellifera. This work presents and discusses the composition of stingless bee propolis and its consequentbiological activities, as well as its potential applications in the food industry.展开更多
文摘Different approaches have been established for applications of social and complex networks involving biological systems, passing through collaborative systems in knowledge networks and organizational systems. In this latter application, we highlight the studies focused on the diffusion of information and knowledge in networks. However, most of the time, the propagation of information in these networks and the resulting process of creation and diffusion of knowledge, have been studied from static perspectives. Additionally, the very concept of diffusion inevitably implies the inclusion of the temporal dimension, due to that it is an essentially dynamic process. Although static analysis provides an important perspective in structural terms, the behavioral view that reflects the evolution of the relationships of the members of these networks over time is best described by temporal networks. Thus, it is possible to analyze both the information flow and the structural changes that occur over time, which influences the dynamics of the creation and diffusion of knowledge. This article describes the computational modeling used to elucidate the creation and diffusion of knowledge in temporal networks formed to execute software maintenance and construction projects, for the period between 2007 and 2013, in the SERVIÇO FEDERAL DE PROCESSAMENTO DE DADOS (FEDERAL DATA PROCESSING SERVICE-SERPRO)—a public organization that provides information and communication technology services. The methodological approach adopted for the study was based on techniques for analyzing social and complex networks and on the complementary extensions that address temporal modeling of these networks. We present an exploratory longitudinal study that enabled a dynamic and structural analysis of the knowledge networks formed by members of software maintenance and development project teams between 2007 and 2013. The study enabled identification of knowledge categories throughout this period, in addition to the determination that the networks have a structure with small-world and scale-free models. Finally, we concluded that, in general, the topologies of the networks studies had characteristics for facilitating the flow of knowledge within the organization.
文摘An understanding of the knowledge creation and diffusion process in the organizational context is extremely relevant. Because from this understanding, organizations can restructure processes, reorient teams and implement methodologies to assist in the construction of an evolutionary process of knowledge creation and diffusion aimed at sustainable growth and innovation. The theory of complex social networks has been applied in several fields to help understand organizational cognitive processes. However, these approaches still insipiently consider the analysis of the nestedness and modularity of the studied networks. In this article, we presented an approach that sought to identify patterns of nestedness and modularity in networks of affiliation of people in projects in the organizational context. The study sought to identify these patterns in affiliation networks in a public organization providing information technology services in the period from 2006 to 2013. The detection of these patterns was performed using the NODF (Nestedness metric based on Overlap and Decreasing Fill) algorithm described by <a href="#ref1">[1]</a>. The nestedness and modularity metrics can influence patterns of knowledge creation and diffusion in formal and informal networks constituted for the execution of projects in organizations. This study showed that the network structures of the organization during the study period presented a high degree of nestedness, and it was possible to identify combined structures of nestedness and modularity.
文摘This work presents an approach to study the diffusion of knowledge in software development project teams based on the formation of complex social network structures in a public organization that offers information and communication technology services. We collected historical data on the allocation and records of hours worked by people in projects to build an affiliation network. We applied the method of reflections to analyze the data obtained. The constructed model enabled the description of the participation of project team members from the perspective of the creation and diffusion of knowledge in affiliation networks that describe the participation of people in projects, mediated by the knowledge and the capabilities developed for the execution of these projects. A contribution of this work is the construction of indicators related to the process of creation and diffusion of knowledge in the context of the execution of software development and maintenance projects, based on the concepts of diversification and ubiquity applied to the process of knowledge diffusion;an additional contribution is the presentation of an application of the method of reflections in an organizational context applied to the creation and diffusion of knowledge. We found that the application of management models associated with the collaborative method applied to the project development process contributed to the joint growth of diversified and more specialized knowledge alongside the knowledge considered more generic and ubiquitous. Our results show that contrary </span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">to </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">previous expectations based on assumptions established at the beginning of the study, we concluded that in six of the seven subnetworks obtained in the period between 2007 and 2013, knowledge based on complex and diversified capabilities showed a growth proportional to the growth of knowledge related to the capabilities necessary to more general and ubiquitous activities.
基金financial support from CNPq(the Brazilian federal grant agency).
文摘Currently, the collaboration in scientific communities has been studied in order to explain, among other things, the knowledge diffusion. The quality of Graduate Programmes is often associated with the scientific collaboration. This paper discusses how scientific collaboration processes can be identified and characterized through social and complex networks. For this purpose, collaboration networks of bibliographic production, research projects, and committees of PhD theses and Masters’ dissertations by researchers from a graduate program in computational modeling were studied. The data were obtained from CAPES’ reports of the period from 2001 to 2009. Among the studied indices, centrality indices indicate the presence of prominent researchers who influence others and promptly interact with other researchers in the network. The indices of complex networks reveal the presence of the small-world (i.e. these networks are favorable to increase coordination between researchers) phenomenon and indicate a behavior of scale-free degree distribution (i.e. some researchers promote clustering more than others) for one of the studied networks.
文摘Visualization methods for single documents are either too simple, considering word frequency only, or depend on syntactic and semantic information bases to be more useful. This paper presents an intermediary approach, based on H. P. Luhn’s automatic abstract creation algorithm, and intends to aggregate more information to document visualization than word counting methods do without the need of external sources. The method takes pairs of relevant words and computes the linkage force between them. Relevant words become vertices and links become edges in the resulting graph.
文摘In project-based organizations knowledge is a critical resource used to develop and deliver products and services with a high level of quality. Therefore, a systematic and sustainable process is necessary to coordinate knowledge management, project management and product lifecycle. This scenario predominates in companies focused on the creation and maintenance of information systems. This article presents an exploratory study based on a framework that integrates cognitive, managerial, and operational processes in a public Brazilian organization that provides services in the area of information and communications technology, focusing on the construction and maintenance of information systems. Those processes are operationalized by three management models considering knowledge, project, and software development processes. Our proposal aims to understand the relationships between those three management models and their influence on the software development process in the organization under study. Our premise is based on the principle that cognitive management, project management, and software development management must be integrated to fulfill the demands of product development and service provision. The research data was composed of registers of working hours spent on software development and maintenance projects involving 244 people allocated to 5064 projects in the period from 2007 to 2013. The study resulted in the identification of the relationships among the three management models adopted by the organization, with emphasis on knowledge management activities, which were not directly identified, making it difficult to account for and measure them. We established a set of activities connected to each one of the knowledge management model phases. Since those activities were not visible before, our approach contributed to build a systematic process to register and relate activities linked to the dimensions of cognitive processes, project management, and software construction.
文摘This work aimed to elucidate the key research findings within the realm of NetZero,specifically within the energy field.Employing advanced data visualization tools,particularly VOSviewer,scientific maps were meticulously crafted to explain the evolving landscape of research in this domain.The results showed that the nations that most vigorously committed to the NetZero endeavor are the United Kingdom,United States,China,Australia,and Canada,signaling a global consensus on the urgency of addressing climate change.Furthermore,this study reveals pivotal trends in the field and keywords such as“renewable energy”,“decarbonization”,“netzero”,and“sustainability”have gained remarkable prominence,especially in recent research.In conclusion,this work offers a comprehensive overview of the NetZero landscape within the energy field,emphasizing the urgency of international collaboration,and identifies key trends that will likely shape the future of sustainable energy research and policymaking.
文摘The Education through Work for Family Health Program (PET Saúde, in Portuguese) created by the Ministries of Education and Health is a proposal to integrate service, learning and community. The goal of PET Saúde is to foster the formation of learning groups within the Family Health Strategy scope. While being studied at the city of Feira de Santana, the program was structured with one coordinator and eleven tutorial groups, distributed in 27 family health offices, which constituted a social network where the construction and knowledge diffusion occur. This article proposes the analysis of the information and knowledge flows of this network through the social networks analysis. This study highlights the play of PET Saúde’s coordinator in the processes of organization and articulation as central vertex of the network, and some scholars in the articulation of different tutorial groups. The results show a fragmentation in the PET Saúde network when the coordinator vertex is removed, whereas 5 components are generated where 4 tutorial groups appear isolated.
文摘Coauthorship networks consist of links among groups of mutually connected authors that form a clique. Classical approaches using Social Network Analysis indices do not account for this characteristic. We propose two new cohesion indices based on a clique approach, and we redefine the network density using an index of variance of density. We have applied these indices to two coauthorship networks, one comprising researchers that published in Mathematics Education journals and the other comprising researchers from a Computational Modeling Graduate Program. A contextualized and comparative analysis was performed to show the applicability and potential of the indices for analyzing social networks data.
基金partially funded by the project“Master’s and PhD in Quantum Technologies-QIN-FCRH-2025-5-1-1”in supported by QuIIN-Quantum Industrial Innovation,EMBRAPII CIMATEC Com-petence Center in Quantum Technologiesfinancial resources from the PPI IoT/Manufatura 4.0 of the MCTI grant number 053/2023,signed with EMBRAPII+1 种基金National Council for Scientific and Technological Development(CNPq,Brazil),for partially funding this work.Erick G.Sperandio Nascimento is a CNPq techno-logical development fellow(Proc.308963/2022-9)the Surrey Institute for People-Centred AI at the University of Surrey(UK)for their institutional support.
文摘The use of computational intelligence has become commonplace for accurate wind speed and energy forecasting,however the energy-intensive processes involved in training and tuning stands as a critical issue for the sustainability of AI models.Quantum computing emerges as a key player in addressing this concern,offering a quantum advantage that could potentially accelerate computations or,more significantly,reduce energy consumption.It is a matter of debate if purely quantum machine learning models,as they currently stand,are capable of competing with the classical state of the art on relevant problems.We investigate the efficacy of quantum neural networks(QNNs)for wind speed nowcasting,comparing them to a baseline Multilayer Perceptron(MLP).Utilizing meteorological data from Bahia,Brazil,we develop a QNN tailored for up to six hours ahead wind speed prediction.Our analysis reveals that the QNN demonstrates competitive performance compared to MLP.We evaluate models using RMSE,Pearson’s R,and Factor of 2 metrics,emphasizing QNNs’promising generalization capabilities and robustness across various wind prediction scenarios.This study is a seminal work on the potential of QNNs in advancing renewable energy forecasting,advocating for further exploration of quantum machine learning in sustainable energy research.
文摘Stingless bees(SLB)are insects bread many centuries ago by indigenous people and more than 500 species have already been described.Interest in SLB’s propolis has grown as a way to value and preserve native bees,in addition to investigating/prospecting compounds with biological functionality(antimicrobial activity,antioxidant,etc.).The natural active compounds found in propolis come from different plant sources,and consequently,each propolis may show unique biological/pharmacological activity.There is still an important gap about the profile of chemical compounds,biological and pharmacological potential of propolis produced by SLBs.This work aimed to investigate the presence of phenolic and coumaric compounds(HPLC-DAD-FLD)and the antimicrobial activity(microdilution method)of propolis extracts from five different species of SLB reared in different places.The samples from Melipona quadrifasciata(82.05 mgGAEg^(−1))and one from,Frieseomelitta doederleini(56.22 mgGAEg^(−1))showed the highest concentrations of phenolic compounds.It was possible to identify in the propolis samples formononetin,kaempferol,gallic acid and coumarin.Resveratrol was detected in all samples,an unprecedent fact for SLB propolis.Candida albicans was susceptible to all tested extracts,while Escherichia coli was inhibited only by propolis from Melipona quadrifas-ciata;Enterococcus faecalis was inhibited by propolis from Plebeiadroryana.,Melipona quadrifasciata and Frieseomelitta doederleini.It was verified that SLB propolis constitutes a source of different biocompounds,which varies according to the location where the bees are raised,and has mainly antifungal activity,generating possibilities of its use in different biotechnological products.
基金VMR was a Master fellow from Bahia State Research Support Foundation(FAPESB-N°BOL0380/2021)RDP,COS and MAUG(313350/2019-1,313641/2019-6 and 304747/2020-3,respectively)are Technological Development fellows from CNPq.
文摘The breeding of stingless bees, known as meliponiculture, can be found throughout the world, and is closely linked tothe history of the first human communities in the Americas. This activity provides products of industrial interest (food,cosmetics, pharmaceuticals), and among them propolis stands out. This matrix is a resinous material but being difficultto classify and conceptualize due to its variability according to the environment and producing species. The propolisproduced by these bees is a source of compounds with nutritional and functional potential, but the main interestis focused on the phenolic compounds. This potential makes propolis a product that can be used in the prospectionof new molecules with antimicrobial and antioxidant activity. Thus, the scientific literature describes propolis activity(generally extracts) against bacteria and fungi, but with a higher microbicidal activity against gram-positive bacteria.The high antioxidant activity of this bee product is a consequence of the presence of several phenolic compounds.The use of propolis from SBP (Stingless bee propolis) is still quite limited, generally restricted to its antioxidant potential, but studies with application in other sectors can benefit this productive sector, as with the propolis produced bythe bee Apis mellifera. This work presents and discusses the composition of stingless bee propolis and its consequentbiological activities, as well as its potential applications in the food industry.
