Open Access

Enzyme technology in Brazil: trade balance and research community

  • Karina de Godoy Daiha1,
  • Gabriela Coelho Brêda1,
  • Ariane Leites Larentis2,
  • Denise Maria Guimarães Freire3 and
  • Rodrigo Volcan Almeida1Email author
Brazilian Journal of Science and Technology20163:17

https://doi.org/10.1186/s40552-016-0029-0

Received: 4 February 2016

Accepted: 2 May 2016

Published: 11 May 2016

Abstract

Despite Brazil’s large numbers and its position as one of the world’s ten largest economies, its exports are mainly composed of non-industrial or low-technological goods. It results in a trade deficit and technological dependence that affects several sectors, including biotechnology. The present study aims at analyzing the Brazilian trade balance (from 1996 to 2013) of enzyme-related goods and correlating such data with the scientific community, number of scientific publications and filings of patent applications related to four technological areas that commonly use lipases, the most important enzyme studied in Brazil. Brazil seems to have a sufficient, but not saturated, technical staff working in enzyme-correlated areas, while the trade balance is deteriorating over the years. The major problem seems to be that the increase in the number of scientists is not accompanied by a proportional increase in effective development policies. These conclusions are corroborated by the number of scientific publications and patent documents related to the industrial use of lipases, one of the most important enzyme group: while Brazil has an important contribution in publishing scientific documents regarding the industrial use of lipases, its contribution in filing patent applications is only marginal.

Keywords

Enzyme technology Trade balance Research community Brazil

Background

Brazil is a country of large numbers: it is a continental size country, the fifth most populous country in the world (United Nations Population Found 2010) and one of the world’s richest countries in biodiversity terms (Mittermeier et al. 2005). Brazil occupied the seventh position in the ranking of world’s largest economies in 2013 (Centre for Economics and Business Research 2013). Despite of the above, Brazil’s exports are mainly composed of non-industrial or low-technological goods. In 2010, the commodities accounted for 51 % of Brazil’s exports, representing around 5 % of all commodities traded in the world. In parallel, Brazil’s contribution to the global exportation of high-technological goods was of around 0.5 % in the same period (Em discussão! Revista de Audiências Públicas do Senado Federal 2012).

Besides affecting the Brazilian trade balance, this scenario causes a high technological dependence that reaches several areas, including the biotechnology sector. Even though the significant growth of this sector in Brazil is worldwide recognized (Nature Editorial 2010; Resende 2012), studies involving Brazilian biotech companies showed that 86 % of them depend on imported goods and services (BRBiotec Brazil 2011). Enzyme technology is a subfield of biotechnology where new processes have been and are being developed to manufacture both bulk and high added-value products utilizing enzymes as biocatalysts. Food, fine chemicals, pharmaceuticals and biofuels are examples of products manufactured using enzymes. This kind of catalyst are also used to provide services, as in washing and environmental processes, or for analytical and diagnostic purposes (Buchholz et al. 2012).

Enzymes are an important branch of biotechnology market, and the world demand on several enzymes is expected to rise 6.3 % annually to U$7 billion in 2017, with Latin America being responsible for a significant percentage of such consumption (Freedonia Group 2014). Considering the rising economic importance of enzyme technology, the present article analyzes the Brazilian trade balance of enzyme-related goods and discusses such data in terms of the Brazilian scientific community, which discussion is further corroborated with bibliometric studies, aiming at answering the following questions: If Brazil’s biotechnological potential is high, why is the enzyme market so in deficit? Has Brazil enough technical staff for developing enzyme technologies?

Methods

Trade balance

Data from 1996 to 2013 have been collected from AliceWeb, a public online database developed by the Brazilian Ministry of Development, Industry and Foreign Trade (MDIC). All data related to imported and exported goods are classified in accordance with the Mercosur Common Nomenclature (MCN), which was adopted by Brazil, Argentina, Paraguay and Uruguay in 1995. The MCN codes comprise eight digits, the first six being formed by the Harmonized System (an international standardized system of names and numbers to classify traded goods) and the last two being specific to the Mercosur context. Thirty-one MCN codes have been selected as being directed to an enzyme itself or an enzyme-containing product. Three of them (30029010, 38220010 and 38220090) have an unclear description and were partially included in the present study as they may encompass enzyme-containing products. The selected MCN codes are listed in Table 1.
Table 1

Mercosur Common Nomenclature (MCN) codes and their respective description

MCN codes

Products

23099060

Preparations with xylanase and Beta-Glucanase, supplemented with wheat bran

30021032

Plasmin (Fibrolysin)

30021033

Urokinase

30029010

Diagnostic reagents of microbial origina

30039021

Drug containing streptokinase, except in doses

30039022

Drug containing l-asparaginase, except in doses

30039023

Drug containing deoxyribonuclease, except in doses

30039029

Drugs with other enzymes, without vitamins, etc., except in doses

30049011

Drug containing Streptokinase, in doses

30049012

Drug containing l-asparaginase, in doses

30049013

Drug containing deoxyribonuclease, in doses

30049019

Drug containing other enzymes in doses

32029030

Enzymatic preparations for pre-tanning

35071000

Rennet and its concentrates

35079011

Alfa-amylase (Aspergillusoryzae)

35079019

Other amylases and their concentrates

35079021

Fibrinucleases

35079022

Bromelain

35079023

Streptokinase

35079024

Streptodornase

35079025

Mixture of streptokinase and streptodornase

35079026

Papain

35079029

Other proteases and their concentrates

35079031

Lysozymeand its hydrochloride

35079032

l-asparaginase

35079039

Other enzymes and their concentrates

35079041

Cellulase-based enzymes

35079042

Transglutaminase-based enzymes

35079049

Other prepared enzymes

38220010

Reagents for determination of blood or urine composition, paper support, etc.a

38220090

Other diagnostic or laboratory reagentsa

aMCNs which descriptions are unclear regarding the inclusion of enzyme-containing products

Research

Statistic analyses on the number of master’s and doctoral degrees granted by December 2013 in Brazil were made based on data obtained at the National Council for Scientific and Technological Development (CNPq) website (www.cnpq.br). Information on the number of researches involved in areas related to enzyme technology and their scientific production were collected at the same website, by searching for keywords in the researchers’ online curriculum (lattes.cnpq.br).

Bibliometric studies

Searches for scientific publications and patent documents from 1983 to 2012 were performed respectively using the platforms Web of Science and Orbit.com. The searches were carried out to four important industrial sectors that employ lipases—kinetic resolution, production of detergents, food and feed and biodiesel—using the search strategies disclosed in Tables 2 and 3.
Table 2

Patent search strategies set up for each of the four applications of lipase

Lipase application

Search strategy

Kinetic resolution

((((LIPASE?)/BI AND (ENANTIO+ OR STEREO_SELECTIV+ OR (OPTIC+ W (ACTIV+ OR PUR+ OR ISOMER+)) OR RESOLUTION OR ((SPLIT+ OR SEPARAT+ OR RESOLV+ OR ESTERIF+) S (CHIRAL+ OR RACEM+)))/BI AND (C12P OR C07C OR C07D OR C12R OR C12N)/IC) NOT (LIPASE S (INHIBITOR+ OR MODULAT+ OR DEFICIENCY))/BI)) AND (EPRD = 1983-01-01:2012-12-31)

Production of detergents

(((LIPASE?)/BI AND (DETERGENT? OR +WASH+ OR LAUND+ OR BLEACH+ OR CLEAN+ OR SOAP+)/BI) AND (C11D OR C12N)/IC) AND (EPRD = 1983-01-01:2012-12-31)

Production of food and feed products

((((LIPASE?)/BI AND (FOOD+ OR FEED+ OR JUICE OR BEVERAGE+ OR FISH OR DOUGH OR MILK+ OR CHEESE+ OR BUTTER+ OR MEAT OR EGG OR YOLK OR BREAD))/BI) NOT ((INHIBITOR+) S LIPASE/BI)) AND (A23+ OR A21+ OR C12N)/IPC AND (EPRD = 1983-01-01:2012-12-31)

Production of biodiesel

(((LIPASE?)/BI AND ((+FUEL? OR +DIESEL?) OR (FATTY ACID W (METHYL OR ALKYL) W ESTER?) OR FAME OR FAAE)/BI) AND (C12P OR C10L OR C12N OR C11C OR C10G)/IC) AND (EPRD = 1983-01-01:2012-12-31)

“?” is a truncation symbol replacing zero or one character; “+” is a truncation symbol representing any number of characters; “_” is an operator indicating that two terms may be connected in a single word or separated in two adjacent words; “W” is an operator indicating that the adjacent terms are in the order specified; “S” is an operator indicating that the terms are in the same sequence. /BI: the terms were searched in the title and abstract of the patent documents; /IC: international patent classification; EPRD: first priority date of the patent family

Table 3

Publication search strategies set up for each of the four applications of lipase

Lipase application

Search strategy

Kinetic resolution

TITLE:(LIPASE$) AND TOPIC((KINETIC OR CHIRAL OR LIPASE OR HYDROLYSIS OR ENZYMATIC) NEAR/1 RESOLUTION) AND PUBLICATION YEARS:(1983–2012)

Production of detergents

TITLE:(LIPASE$) AND TOPIC(*DETERGENT$ OR LAUNDR* OR DISH* OR ((REMOV* OR CLEAN* OR WASH*) NEAR/1 (STAIN* OR OIL$ OR GREASE OR FAT* OR TRIGLYCERIDE$ OR SOIL$))) AND PUBLICATION YEARS:(1983–2012)

Production of food and feed products

TOPIC:(LIPASE* AND (((FOOD* OR FEED) NEAR/5 (INDUSTR* OR FORMULATION* OR PRODUCT*)) OR (CHEESE* NEAR/1 (RIPENING OR FLAVOR* OR MAKING OR PRODUCT*)) OR ((BUTTER OR MILK) NEAR/0 (EQUIVALENT* OR SUBSTITUTE*)) OR “DAIRY PRODUCT*” OR DOUGH*)) AND PUBLICATION YEARS: (1983–2012)

Production of biodiesel

TITLE:(LIPASE$) AND TOPIC(BIODIESEL OR DIESEL OR BIOFUEL$ OR FUEL$) AND PUBLICATION YEARS: (1983–2012)

“*” is a truncation symbol replacing any number of characters; “$” is a truncation symbol replacing zero or one character; “NEAR/n” is an operator indicating that two terms are within n words of each other

The data obtained from these searches also resulted in a study that aimed at evaluating the biotechnological interest towards lipases, which study was published by our research group in the journal Plos One, in 2015 (Daiha et al. 2015).

Results and discussion

Trade balance

The evolution of Brazilian trade balance in the enzyme technology field has been analyzed in terms of the value and volume of the goods imported and exported by the country. In both cases, it is verified a growing trade deficit through the period of analysis, which profile may be related to the fact that Brazil’s imports are increasing at a significant higher rate when compared to the exports (Fig. 1).
Fig. 1

Exports (gray), imports (white) and trade balance (black) including the thirty-one MCNs; a in terms of values (in millions of USD); and b in terms of amounts (in tons). The profile of both graphs showed no significant difference when the three doubtful MCN codes were not considered (data not provided)

Such difference between imports and exports is more significant when the analysis is performed considering the value of the goods (Fig. 1a). This is so since Brazil’s exports are mainly characterized by low value-added goods, whilst the country depends on high value-added goods produced abroad.

Another indicative of the low value-added of the goods included in the enzyme technology field exported by Brazil is the comparison between the percentage of exports in USD and tons (Fig. 2). In the period of analysis, the percentages of exports measured by value and volume are of around 14 and 40 % respectively. This fact indicates that Brazil import more added value goods when compared with the exported goods.
Fig. 2

Exports divided by total trade balance in USD (white) and exports divided by total trade balance in tons (black)

Comparing Brazil’s biotechnology potential expressed by its great biodiversity found in many biomes (e.g. Amazon Forest, Cerrado, Atlantic Forest, and others) with Brazil’s trade balance deficit the contradiction is visible. Why Brazil has one of the most important biodiversity of the world but has a negative trade balance in enzyme market? Could the trade balance deficit be explained by a deficit in technical staff? In order to answer these questions the researcher community in Brazil has been analyzed using data obtained at the National Council for Scientific and Technological Development (CNPq)’s database.

Research community

According to data provided at CNPq’s website, by December 2013 Brazilian postgraduate programs had granted almost 310,000 master’s degrees and 172,000 doctoral degrees. In areas related to enzyme technology (chemical engineering, science and food technology, biochemistry, microbiology, pharmacy and chemistry), these numbers are 14,285 and 17,660, respectively, corresponding to 5 and 10 % of the total (Figs. 3, 4).
Fig. 3

a Percentage of master’s degrees granted by Brazilian postgraduate programs in areas related to enzyme technology, b percentage distribution per area of the master’s degrees granted in areas related to enzyme technology

Fig. 4

a Percentage of doctoral degrees granted by Brazilian postgraduate programs in areas related to enzyme technology, b percentage distribution per area of the doctoral degrees granted in areas related to enzyme technology

Furthermore, Brazil’s participation in the global scientific production remarkably grew over the last 20 years. In 2009, Brazil occupied the 13th place in the international ranking of scientific publications, surpassing countries such as Belgium and Denmark, which have more experience and tradition in the development of science (Almeida and Guimarães 2013). According to Almeida, the current performance of the country in producing science may be directly related to the expansion of the postgraduate system, which has been growing at a rate of 10 % per year in terms of new courses and number of master’s and doctoral degree holders.

By analyzing such data, it can be verified that Brazil has significant numbers concerning the technical staff in enzyme technology correlated areas. Nevertheless, when considering the scientific production in enzyme technology by searching for accurate phrases associated to this field in researchers’ online curriculum, it can be observed that the numbers are lower than it could have been expected from the previous data. Although 10 % of the doctoral degree holders are included in areas related to enzyme technology, a much smaller percentage is indeed producing knowledge in areas such as “enzyme technology”, “enzyme production”, “enzyme immobilization” and “enzymology” (Table 4).
Table 4

Accurate phrases related to the enzyme technology field searched in the online curriculum of the researches

Accurate phrases

DScs

Other researchers

Enzyme technology

108

38

Enzyme production

566

481

Enzyme immobilization

206

65

Enzymology

345

143

Enzyme kinetics

276

93

“Other researches” includes MSc, graduate and undergraduate students, and others

Research community specialization

Table 5 shows a correlation of the MCN codes, each represented by a keyword, with the scientific production of Brazilian researchers in the enzyme technology field. The results of the search for “production of (keyword)” in the researchers’ online curriculum render clear the dominance of the Brazilian research on the so-called “enzyme commodities”, that is, large scale produced enzymes with low marked prices. Xylanase, amylase, protease, cellulase and lipase are enzymes that may be characterized as enzyme commodities. As commodities, these enzymes are used in detergents composition, food industry, bioenergy production (ethanol 2G and biodiesel), etc. Although it cannot be asserted that all researchers listed in Table 5 works in the areas they have been allotted, it is interesting to observe that there is a correlation between the Brazilian economic structure, which is based on the production of commodities and low value-added goods, and the kind of enzymes most studied by the Brazilian researcher community. These data may suggest that economic specialization promotes a parallel specialization in the enzyme technology research community.
Table 5

Correlation of the MCN codes with the scientific production of Brazilian researchers

MCN

Keyword

Number of DSc + Other researchers

“Production of (keyword)”

23099060

Xylanase

200

30021033

Urokinase

0

35071000

Rennet

9

30039021

Streptokinase

0

30049011

 

35079023

 

35079024

Streptodornase

0

35079025

Streptodornase

0

Streptokinase

0

30039023

Deoxyribonuclease

2

30049013

 

35079032

Asparaginase

28

30049012

 

35079011

Alfa-amylase

76

35079019

Amylase

149

35079021

Fibrinolysin

0

35079022

Bromelain

4

35079026

Papain

2

35079029

Protease

167

35079031

Lysozyme

1

35079041

Cellulase

194

30021032

Plasmin

0

Fibrinolysin

0

35079042

Transglutaminase

14

35079049

Protease

167

Collagenase

13

30039029

Pancreatin

0

Lipase

371

Protease

167

Amylase

149

35079039

Glucose oxidase

2

Catalase

8

Cellulase

194

Pectinase

50

Lipase

371

Bibliometric study

In order to access information regarding the type of work that has been realized by such scientific community, a bibliometric study related to scientific publications and patent documents was performed. Four industrial sectors that employ lipases were took into consideration—kinetic resolution, production of food and feed, detergent and biodiesel. Lipases were chosen as the enzyme model as they are one of the enzyme groups most researched by the Brazilian scientific community (Table 5).

Although the Brazilian contribution to the global scientific production is of 2.4 %, Brazil accounts for only 0.2 % of the filings of patent applications, which is considered an important technical indicator (Em discussão! Revista de Audiências Públicas do Senado Federal 2012). As to enzyme technology, more specifically to lipases, the results of the present bibliometric study show that the Brazilian participation in the development and publication of scientific and patent follows the same pattern (Fig. 5).
Fig. 5

Percentage of scientific publications with Brazilian authors and patents with Brazilian applicants. Bibliometric studies realized from 1983 to 2012

In kinetic resolution, Brazil is in the eleventh position in the ranking of scientific publications, totaling 52 documents between 1983 and 2012; in the triennium of from 2010 to 2012 Brazil occupied the second position in such ranking, only behind China. Nevertheless, Brazilian participation in the filing of patent applications is not as significant. No patent document found in the searches claims priority for a Brazilian document.

In production of food & feed, industrial sector that demands the greatest amount of enzymes in Brazil, 29 % in 2012 (Freedonia Group 2014), only one patent document claiming priority for a Brazilian document was found, which was filed by the Federal University of Minas Gerais and the company Phoneutria Biotecnologia e Serviços Ltda. On the other hand, Brazil ranks fifth in number of scientific documents published in this sector from 1983 to 2012, with 16 publications.

Brazil is the fourth largest global market of cleaning products, and in 2012 had revenues of 14.9 billion reais (ABIPLA 2013). In the searches for scientific documents published by Brazilian research groups, only eight articles were detected in the period from 1983 and 2012, five of which are authored by groups from the State University of Campinas—UNICAMP). Moreover, despite the growing importance of the Brazilian market, only two patent documents have national applicants in the same period, one of them being co-assigned with Unilever N.V.

The Brazilian global participation as biodiesel consumer and producer is significant. In 2013, the country was the second largest consumer of such biofuel, with a demand of 2.9 million m3. In the same year, the country ranks third in the production of biodiesel, yielding 3.0 million m3 (Ministério de Minas e Energia 2014). Brazil also stands out in studies related to biofuels. With specific respect to the scientific research related to the use of lipases for biodiesel production by enzymatic route, the country occupied the second global position up to 2012, with 52 publications. However, despite the country’s expressiveness in scientific publications directed to biodiesel production by transesterification involving lipases, only five patent documents, among the 165 documents found in the search, were filed by Brazilian applicants. It is noteworthy that the participation of Brazilian public universities in the filing of patent documents is more expressive than that of Brazilian companies.

The analysis of the publication countries of a given patent document can be used as an indication of the attractiveness of a country to foreign technologies. The results of the searches show that Brazil is not one of the most attractive countries to external technologies related to the industrial use of lipases (Fig. 6), the highest values being found in the detergent sector, wherein the country occupies the eighth position with almost 20 % of the patents published in Brazil. Conversely, in the other sectors included in this study—kinetic resolution (nineteenth position), food and feed (thirteenth position) and biodiesel (ninth position)—Brazil is behind countries that have lower performance in scientific publication in the same sectors. In the case of kinetic resolution, for example, Brazil is behind countries like South Africa and Hungary.
Fig. 6

Percentage of patents with publication in Brazil in comparison with all other countries. Bibliometric studies realized from 1983 to 2012

Taking all data together, it can be assumed that the deficit in the Brazilian trade balance of enzyme-related goods is not entirely due to a lack of technical staff, since a considerable number of DSc and MSc are formed every year in areas related to enzyme technology. However, taking into account the bibliometric study carried out, and considering that the Brazilian contribution in the filing of patent documents is only marginal, it can be assumed that theses researchers have not been producing knowledge inside the productive sector (i.e. industries), but mainly in universities and governmental research centers. These results may be explained by the fact that only 42 % of the Brazilian researches are employed in firms, while 79 % of North American researchers leave the university (Em discussão! Revista de Audiências Públicas do Senado Federal 2012). These findings can be related to the type of industrial production performed in Brazil, which is specialized in producing low-value added products, and to the low public and private investments in scientific researches.

In fact, an expanded look shows that trade deficit reaches the Brazilian trade balance as a whole, and is even greater for goods of the manufacturing industry (Instituto de Estudos para o Desenvolvimento Industrial 2014). Considering the classification according to technological intensity used by the Organization of Economic Co-operation and Development (OECD), it can be observed that Brazil is specialized in exporting low technological goods. On the other hand, Brazil’s imports are mainly constituted by goods with media-high and high technological intensity (Fig. 7). While imports of medium–high and high technological intensity goods totalize around 60 % of Brazilian overall trade balance, exports of this group of goods account only for 25–30 %. These numbers suggest a specialization in Brazilian industrial policy in favor of producing low value-added goods.
Fig. 7

a Exports of products of the Manufacturing Industry by technological intensity and further products; and b imports of products of the Manufacturing Industry by technological intensity and further products

Source: Letter IEDI n. 622, 2014

Brazilian Industrial Policy related to biotechnology

Although the development of the biotechnological field has been a priority of the Brazilian government since 1970 (Ferrer et al. 2004), it seems that the different programs created ever since have not been effective in transforming the country into a reference in industrial biotechnology. It is only from 2004, with the Industrial and Technological and Foreign Trade Policy, that biotechnology has been considered as a “strategic field” (Bianchi 2013).

In 2007, the Brazilian government launched the Biotechnology Development Policy (Decree No. 6041), which, according to its first article, “aims to establish a suitable environment for the development of innovative biotechnology products and processes”. It has also created the Biotechnology National Committee, responsible for coordinating the implementation of the Biotechnology Development Policy.

The industrial policy currently in force is the Greater Brazil Plan, launched in 2011. In a document published in 2013 by the National Confederation of Industry called “Bioeconomy: an agenda for Brazil”, it is proposed the inclusion of biotechnology in the “Structuring Guideline 2—Expansion and creation of new technological and business skills”. Such inclusion would allow that all measures being taken in other sectors to boost investments were extended to biotechnology (Harvard Business Review Analytic Services 2013).

Despite all these policies, the biotech sector in Brazil is yet weak, as it has been shown in 2011 by the Brazilian Biotechnology Association. The Brazil Biotech Map—2011 (BRBiotec 2011) is a report about private companies in Brazilian territory. This report has showed that Brazil had 237 biotech companies; most of them being micro and small sized-companies. Among these companies, 56 % have annual revenues of no more than R$ 2.4 million (around 1.5 million dollars), 20 % have no revenues, and 85 % have up to 50 employees (20 % of them between 1 and 5 employees and 25 % of them having between 6 and 10). Furthermore, 25 % of the companies export, but on the other hand, 86 % of them import especially reagents and equipment for the production and development of technology.

Conclusion

The trade balance of enzyme-related goods in Brazil is negative, and despite the Brazilian industrial policies and the Biotechnology Development Policy created in 2007, it has a tendency to become even more negative. The data presented herein suggests that Brazil has a sufficient technical staff. However, it does not means that the community research in enzyme technology is saturated. The major problem seems to be that the increase in the number of scientists is not accompanied by a proportional increase in the indicators of innovation in the country, which can also be observed in the bibliometric studies involving lipases, the most studied group of enzymes in Brazil. One other possible explanation for such disparity is the lack of demand by the Brazilian private firms.

On the other hand, when the entire Brazilian trade balance is analyzed, it is possible to conclude that the majority of Brazilian exports are composed of non-industrial or low-technological goods. The loss of national industrial competitiveness is another result of the lack of innovation, which will not be overcome if additional public and private investments are not made in science and technology.

Declarations

Authors’ contributions

RVA conceived of the study, and participated in its design and coordination and helped to draft the manuscript; KGD participated in the design of the manuscript and drafted it; GCB, ALL and DMGF critically revised the manuscript for important intellectual content. All authors read and approved the final manuscript.

Acknowledgements

We would like to thank FAPERJ, CAPES, CNPq and PETROBRAS for their financial support and Banco Central do Brasil for providing the numbers of trade balance.

Competing interests

The authors declare that they have no competing interests.

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors’ Affiliations

(1)
Laboratório de Microbiologia Molecular e Proteínas, Instituto de Química, Universidade Federal do Rio de Janeiro
(2)
Centro de Estudos da Saúde do Trabalhador e Ecologia Humana, Escola Nacional de Saúde Pública Sergio Arouca - Fundação Oswaldo Cruz
(3)
Laboratório de Biotecnologia Microbiana, Instituto de Química, Universidade Federal do Rio de Janeiro

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Copyright

© The Author(s). 2016