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Resumo speciesLink é um portal de informações em larga escala sobre biodiversidade, que existe graças a uma ampla rede colaborativa de pessoas e instituições. O envolvimento do CRIA com a comunidade científica do Brasil e de outros países é responsável pelos resultados expressivos alcançados, atingindo atualmente mais de 15 milhões de registros de dados primários de biodiversidade, sendo 95% associados a espécimes preservados e cerca de 25% a imagens digitais de alta qualidade. A rede fornece dados sobre mais de 200.000 espécies, das quais mais de 110.000 ocorrem no Brasil. Este artigo descreve as redes temáticas do speciesLink, bem como algumas das ferramentas mais úteis desenvolvidas. A importância e as contribuições do speciesLink são destacadas, assim como as preocupações em garantir um apoio financeiro estável para e-infraestruturas de dados sobre biodiversidade. Aqui revisamos o valor do speciesLink como uma das principais fontes de informação sobre biodiversidade para pesquisa, educação, tomada de decisão, desenvolvimento de políticas e bioeconomia.

Abstract speciesLink is a large-scale biodiversity information portal that exists thanks to a broad collaborative network of people and institutions. CRIA’s involvement with the scientific community of Brazil and other countries is responsible for the significant results achieved, currently reaching more than 15 million primary biodiversity data records, 95% of which are associated with preserved specimens and about 25% with high-quality digital images. The network provides data on over 200,000 species, of which over 110,000 occur in Brazil. This article describes thematic networks within speciesLink, as well as some of the most useful tools developed. The importance and contributions of speciesLink are outlined, as are concerns about securing stable budgetary support for such biodiversity data e-infrastructures. Here we review the value of speciesLink as a major source of biodiversity information for research, education, informed decision-making, policy development, and bioeconomy.

https://doi.org/10.1590/1676-0611-bn-2022-1394

1,3-thiazolium-5-thiolates mesoionic compounds: semiempirical evaluation of their first static hyperpolarizabilities and synthesis of new examples
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Lyra, Bruno F.

; Morais, Soraya A. de

; Rocha, Gerd B.

; Miller, Joseph

; Moura, Gustavo L. C.

; Simas, Alfredo M.

; Peppe, Clovis

; Athayde-Filho, Petrônio F. de

Journal of the Brazilian Chemical Society

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2010, Volume 21 N. 5 Pages 934 - 940

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Cálculos semi-empíricos do tipo AM1-TDHF para a primeira hiperpolarizabilidade estática, β(0), de dezesseis compostos mesoiônicos do sistema 1,3-tiazólio-5-tiolato foram realizados. Com base nos resultados obtidos, dois novos compostos mesoiônicos, 2-(4-nitrofenil)-3-metil-4-(metilfenil)-1,3-tiazólio-5-tiolato e 2-(4-nitrofenil)-3-metil-4-(metoxifenil)-1,3-tiazólio-5-tiolato, foram sintetizados e caracterizados por métodos espectroscópicos e analíticos.

Semiempirical AM1-TDHF calculations of the static first hyperpolarizabilities, β(0), of 1,3-thiazolium-5-thiolate mesoionic derivatives were performed. Guided by these results, two new mesoionic compounds - 2-(4-nitrophenyl)-3-methyl-4-(methylphenyl)-1,3-thiazolium-5-thiolate and 2-(4-nitrophenyl)-3-methyl-4-(methoxyphenyl)-1,3-thiazolium-5-thiolate - were synthesized and characterized by analytical and spectroscopic means.

2478 downloads

Theoretical nonlinear optics equivalence between mesoionic and polyenic bridges in push-pull compounds
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Silva, Andréa M. S.

; Rocha, Gerd Bruno da

; Menezes, Paulo Henrique

; Miller, Joseph

; Simas, Alfredo M.

Journal of the Brazilian Chemical Society

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jun 2005, Volume 16 N. 3b Pages 583 - 588

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Nesse trabalho, descrevemos uma investigação semi-empírica com o objetivo de estabelecer uma equivalência em termos do valor da primeira hiperpolarizabilidade estática, beta(0), de compostos push-pull do tipo aceitador de elétrons(A)-ponte-doador de elétrons(D) formados ou por pontes poliênicas ou por pontes mesoiônicas, mantendo inalterados os grupos D e A. As geometrias do estado fundamental das moléculas foram otimizadas com o método AM1, utilizando o programa Mopac93r2. O valor de beta(0) foi calculado através do método de Hartree-Fock dependente do tempo (TDHF). Nossos resultados indicam que a ponte formada por anéis mesoiônicos pode equivaler a até mais de sete ligações duplas conjugadas, dependendo do anel, e reafirmam que anéis mesoiônicos se constituem em materiais promissores para aplicações em fotônica.

In this work we report a semiempirical investigation with the purpose of establishing an equivalence in terms of the value of the first static hyperpolarizability, beta(0), of push-pull compounds of the type electron-acceptor(A) - bridge - electron-donor(D), either formed by polyenic bridges or by mesoionic bridges, keeping unchanged both D and A groups. The ground state geometries of the molecules were optimized via AM1 using Mopac93r2 program. The value of beta(0) was calculated by time-dependent Hartree-Fock (TDHF). Our results indicate that a bridge formed by a single mesoionic ring can be equivalent to seven or more conjugated double bonds, depending on the ring, reaffirming that mesoionic rings constitute promising materials for photonics applications.

2012 downloads

NMR Spectroscopy, Hammett Correlations and Biological Activity of Some Schiff Bases Derived from Piperonal
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Echevarria, Aurea

; Nascimento, Maria da Graça

; Gerônimo, Vanilde

; Miller, Joseph

; Giesbrecht, Astréa

Journal of the Brazilian Chemical Society

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jan 1999, Volume 10 N. 1 Pages 60 - 64

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Uma série de Bases de Schiff foi sintetizada através da reação de condensação do piperonal (3,4-metilenodioxibenzaldeido) com as correspondentes aminas primárias aromáticas. Seus espectros de RMN de ¹H e 13C foram obtidos e estudou-se as correlações de Hammett envolvendo os deslocamentos químicos e as constantes dos substituíntes (sigmap, sigmaR e sigmaI). Observou-se correlações lineares e bilineares significativas para o carbono imínico (C-alfa) e C-1’, indicando maior contribuição do efeito de ressonância do substituinte sobre os deslocamentos químicos. Os assinalamentos dos C-4’ apresentaram-se bem alterados pelos efeitos dos substituíntes, especialmente pelos halogênios, na direção esperada. A série de Bases de Schiff foi ensaiada contra microorganismos, sendo que apresentou atividade significativa frente a fungos filamentosos, especialmente o Epidermophyton floccosum. Não foram observadas correlações significativas entre a atividade biológica e os efeitos eletrônicos.

A series of eleven Schiff Bases have been synthesized. They were obtained by condensation of piperonal (3,4-methylenedioxybenzaldehyde) with the corresponding aromatic primary amines. Their ¹H and 13C-NMR spectra have been obtained and the Hammett correlations including chemical shifts and the subsitutent constants (sigmap, sigmaR e sigmaI) were studied. Linear and bilinear significant correlations were observed for iminic carbon (C-alpha) and C-1’, showing a more significant ressonance effect on chemical shifts. The chemical shifts for C-4’ were highly affected by substituent effects, especially for halogens in the expected direction. Their biological activity against microorganisms has also been measured and significant activity was showed against Epidermophyton floccosum. The biological activity did not give a reasonable relationship with electronic effects.

11283 downloads

Reatividade Relativa em Solvólise Nucleofílica de Cloretos de Arilsulfenila, Arilcarbonila, Arilsulfonila, Arilmetila e de Arila
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Hirata, Rodobiko

; Kiyan, Nilo Zengo

; Miller, Joseph

Química Nova

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jun 1997, Volume 20 N. 3 Pages 238 - 244

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

The experimental results for the 2-propanolysis of benzoyl, benzyl, benzene sulphenyl and benzene sulphonyl chlorides obtained by conductimetric technique were compared with estimates for chlorobenzene which is extremely unreactive as an electrophile. We thus obtained the following reactivity sequence: PhSCl>PhCOCl>PhSO2Cl>PhCH2 Cl>PhCl with rate-coefficiente ratios (in the same order): 9.5 x 10(4) : 1: 7.14 x 10-2 : 4.7 x 10-3 : about 10-26. We have discussed these results in specific terms and with the aid of general conclusions which stem from our own classification of electrophiles.

5191 downloads

Methionine enkephalin: immunomodulator in normal volunteers, cancer and AIDS patients
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Plotnikoff, Nicholas P.

; Miller, Gerald C.

; Nimeh, Nadim F.

; Wybran, Joseph

Memórias do Instituto Oswaldo Cruz

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1987, Volume 82 Suppl. 2 Pages 67 - 73

Abstract: En | Text: En | PDF: En

Clinical studies of the immunological effects of methionine enkephalin in normal volunteers, cancer, and AIDS patients are summarized. The major immunology changes seen were increases in T cell subsets, natural killer activity, as well as mitogen blastogenesis. Clinically, the cancer and ARC patients did not develop infections.

1528 downloads

Verificação da resposta de miracídios de Schistosoma mansoni a substâncias provenientes de moluscos planorbídeos: pesquisa de substâncias quimiotáxicas
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Brasio, Beatriz de Camargo

; Magalhães, Luiz Augusto

; Miller, Joseph

; Carvalho, José F. de

Revista de Saúde Pública

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apr 1985, Volume 19 N. 2 Pages 154 - 170

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Foi testada a atividade miraxonal da água de condicionamento (SCW) e da hemolinfa de Biomphalaria glabrata e de B. tenagophila frente a miracídios de Schistosoma mansoni das linhagens BH e SJ. Foram pesquisados e isolados alguns componentes de SCW. Com os componentes isolados de SCW e com a hemolinfa foram preparados blocos de ágar. Esses blocos, assim preparados, foram colocados frente a miracídios de S. mansoni para avaliação da atividade miraxonal. Foram detectadas diferenças entre a ação miraxonal da hemolinfa e das substâncias isoladas de SCW. Observaram-se diferenças significativas entre os efeitos miraxonais das duas espécies de moluscos pesquisados frente a miracídios das linhagens BH e SJ.

Several substances isolated from SCW (snail conditioned water and from snail hemolymph were tested for a possible chemiotaxic effect on Schistosoma mansoni miracidia. Two strains of miracidia were considered (SJ and BH). Agar plates prepared with one of the substances were exposed to sixty miracidia for five minutes. The number of contacts and contacts with return were counted. Ten replications were made. Eight types (and four sub types) of agar plates were prepared: normal water (control), SCW (Biomphalaria glabrata and B. tenagophila), hemolymph (B. glabrata and B. tenagophila) and amonia, calcium, magnesium, sodium and potassium. Log-linear models were fitted to the data to study the proportions of attraction to each substance and to compare them. Any possible differences in proportions of attraction between the two S. mansoni strains were tested.

1238 downloads Cited 2 times in SciELO

Verificação da resposta de miracídios de Schistosoma mansoni a substâncias provenientes de moluscos planorbídeos: pesquisa de substâncias quimiotáxicas
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Brasio, Beatriz de Camargo

; Magalhães, Luiz Augusto

; Miller, Joseph

; Carvalho, José F. de

Revista de Saúde Pública

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apr 1985, Volume 19 N. 2 Pages 154 - 170

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

1385 downloads Cited 2 times in SciELO

Atração de miracídios de Schistosoma mansoni por hospedeiros invertebrados: comportamento de miracídios frente a girinos de Hyla fuscovaria
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Brasio, Beatriz de C.

; Magalhães, Luiz Augusto

; Miller, Joseph

; Carvalho, José F. de

Revista de Saúde Pública

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feb 1985, Volume 19 N. 1 Pages 18 - 27

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Analisou-se a atração de miracídios de Schistosoma mansoni das linhagens BH e SJ frente a seus vetores simpátricos e alopátricos tendo-se em consideração a possibilidade da presença de substâncias quimiotáxicas emanadas dos moluscos. Estudou-se também o comportamento desses miracídios frente a girinos de Hyla fuscovaria. Foi verificado que houve atração dos miracídios pelos moluscos vetores e que essa atração foi mais evidente quando a larva era colocada frente ao seu hospedeiro simpátrico.As observações realizadas no decorrer da experiência demonstraram a presença de substâncias miraxonais emanadas pelos moluscos.

Miracidia tropism to suitable hosts is a subject of much controversy. In this work, we try to determine the possible specificity of Schistosoma mansoni miracidia attraction and also the degree of this specificity. To this end an experiment was carried out to determine the probability of attraction in a given experimental set up, to H. fuscovaria girina or to one of two susceptible snail species. Two strains of S. mansoni were employed and also the corresponding snail species. A specially designed apparatus consisting of two circular glass chambers joined by an open channel was used. One of the girina or a snail was placed in one of the chambers (randomly chosen). In the channel a known number of miracidia were deposited and the count of miracidia in each of the three compartments (the two chambers and the channel) was recorded. The experiment was carried out under strong or subdued lighting. Statistical and ad-hoc exploratory data analysis have shown that: a) the miracidia, when exposed to only one species of snail, show more attraction to the sympatric snail host; b)one strain of miraciadia showed more attraction under strong lighting; the other strain behaved the opposite way, with stronger attraction under weak liht; c) the girina did not attract the miracidia; this seems to imply that sone chemiotropism is present in this phenomenon.

1986 downloads

10.

Atração de miracídios de Schistosoma mansoni por hospedeiros invertebrados: comportamento de miracídios frente a girinos de Hyla fuscovaria
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Brasio, Beatriz de C.

; Magalhães, Luiz Augusto

; Miller, Joseph

; Carvalho, José F. de

Revista de Saúde Pública

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feb 1985, Volume 19 N. 1 Pages 18 - 27

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

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