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1.
Braz. j. biol ; 84: e255692, 2024. tab, graf, ilus
Article in English | VETINDEX | ID: biblio-1374646

ABSTRACT

The current research was designed to reach extracellular protease production potential in different strains of Sordaria fimicola which were previously obtained from Dr. Lamb (Imperial College, London) from North Facing Slope and South Facing Slope of Evolution Canyon. After initial and secondary screening, two hyper-producers strains S2 and N6 were selected for submerged fermentation and cultural conditions including temperature, pH, incubation period, inoculum size, substrate concentration, and different carbon and nitrogen sources were optimized for enzyme production. S2 strain showed maximum protease production of 3.291 U/mL after 14 days of incubation at 30 °C with 7 pH, 1% substrate concentration and 1 mL inoculum, While N6 strain showed maximum protease production of 1.929 U/mL under fermentation optimized conditions. Another aim of the present research was to underpin the biodiversity of genetics and post-translational modifications (PTMs) of protease DPAP (peptidyl-aminopeptidase) in Sordaria fimicola. Five polymorphic sites were observed in amino acid sequence of S. fimicola strains with reference to Neurospora crassa. PTMs prediction from bioinformatics tools predicted 38 phosphorylation sites on serine residues for protease peptidyl-aminopeptidase in S1 strain of S. fimicola while 45 phosphorylation sites on serine in N7 strain and 47 serine phosphorylation modifications were predicted in N. crassa. Current research gave an insight that change in genetic makeup effected PTMs which ultimately affected the production of protease enzyme in different strains of same organism (S. fimicola). The production and molecular data of the research revealed that environmental stress has strong effects on the specific genes through mutations which may cause genetic diversity. S. fimicola is non- pathogenic fungus and has a short life cycle. This fungus can be chosen to produce protease enzyme on a commercial scale.


A pesquisa atual foi projetada para alcançar o potencial de produção de protease extracelular em diferentes cepas de Sordaria fimicola que foram previamente obtidas do Dr. Lamb (Imperial College, Londres) de North Facing Slope e South Facing Slope de Evolution Canyon. Após a triagem inicial e secundária, duas cepas hiperprodutoras S2 e N6 foram selecionadas para fermentação submersa e condições culturais, incluindo temperatura, pH, período de incubação, tamanho do inóculo, concentração de substrato, e diferentes fontes de carbono e nitrogênio foram otimizadas para produção de enzima. A cepa S2 apresentou produção máxima de protease de 3,291 U/mL após 14 dias de incubação a 30 °C com pH 7, concentração de substrato de 1% e inóculo de 1 mL, enquanto a cepa N6 apresentou produção máxima de protease de 1,929 U/mL em condições otimizadas de fermentação. Outro objetivo da presente pesquisa foi sustentar a biodiversidade da genética e modificações pós-tradicionais (PTMs) da protease DPAP (peptidil-aminopeptidase) em Sordaria fimicola. Cinco sítios polimórficos foram observados na sequência de aminoácidos de cepas de S. fimicola com referência a Neurospora crassa. A previsão de PTMs a partir de ferramentas de bioinformática previu 38 locais de fosforilação em resíduos de serina para protease peptidil-aminopeptidase na cepa S1 de S. fimicola, enquanto 45 locais de fosforilação em serina na cepa N7 e 47 modificações de fosforilação de serina foram previstas em N. crassa. A pesquisa atual deu uma ideia de que a mudança na composição genética afetou os PTMs que, em última análise, afetaram a produção da enzima protease em diferentes cepas do mesmo organismo (S. fimicola). A produção e os dados moleculares da pesquisa revelaram que o estresse ambiental tem fortes efeitos sobre genes específicos por meio de mutações que podem causar diversidade genética. S. fimicola é um fungo não patogênico e tem um ciclo de vida curto. Esse fungo pode ser escolhido para produzir enzima protease em escala comercial.


Subject(s)
Peptide Hydrolases/genetics , Sordariales , Enzymes/genetics , Fungi
2.
Braz. j. biol ; 84: e251197, 2024. tab, graf
Article in English | LILACS, VETINDEX | ID: biblio-1350305

ABSTRACT

Abstract Birds are among the best bio-indicators, which can guide us to recognize some of the main conservation concerns in ecosystems. Anthropogenic impacts such as deforestation, habitat degradation, modification of landscapes, and decreased quality of habitats are major threats to bird diversity. The present study was designed to detect anthropogenic causative agents that act on waterbird diversity in Tarbella Dam, Indus River, Pakistan. Waterbird censuses were carried out from March 2019 to February 2020 in multiple areas around the dam. A total of 2990 waterbirds representing 63 species were recorded. We detected the highest waterbird richness and diversity at Pehure whereas the highest density was recorded at Kabbal. Human activity impacts seemed to be the main factor determining the waterbird communities as waterbirds were negatively correlated with the greatest anthropogenic impacts. Waterbirds seem to respond rapidly to human disturbance.


Resumo As aves estão entre os melhores bioindicadores, o que pode nos orientar a reconhecer algumas das principais preocupações de conservação dos ecossistemas. Impactos antrópicos como desmatamento, degradação de habitat, modificação de paisagens e diminuição da qualidade dos habitats são as principais ameaças à diversidade de aves. O presente estudo foi desenhado para detectar agentes causadores antropogênicos que atuam na diversidade de aves aquáticas na Represa de Tarbella, rio Indus, Paquistão. Censos de aves aquáticas foram realizados de março de 2019 a fevereiro de 2020 em várias áreas ao redor da barragem. Um total de 2.990 aves aquáticas representando 63 espécies foi registrado. Detectamos a maior riqueza e diversidade de aves aquáticas em Pehure, enquanto a maior densidade foi registrada em Kabbal. Os impactos da atividade humana parecem ser o principal fator determinante das comunidades de aves aquáticas, uma vez que as aves aquáticas foram negativamente correlacionadas com os maiores impactos antrópicos. As aves aquáticas parecem responder rapidamente às perturbações humanas.


Subject(s)
Humans , Ecosystem , Rivers , Pakistan , Conservation of Natural Resources
3.
Braz. j. biol ; 842024.
Article in English | LILACS-Express | LILACS, VETINDEX | ID: biblio-1469267

ABSTRACT

Abstract Birds are among the best bio-indicators, which can guide us to recognize some of the main conservation concerns in ecosystems. Anthropogenic impacts such as deforestation, habitat degradation, modification of landscapes, and decreased quality of habitats are major threats to bird diversity. The present study was designed to detect anthropogenic causative agents that act on waterbird diversity in Tarbella Dam, Indus River, Pakistan. Waterbird censuses were carried out from March 2019 to February 2020 in multiple areas around the dam. A total of 2990 waterbirds representing 63 species were recorded. We detected the highest waterbird richness and diversity at Pehure whereas the highest density was recorded at Kabbal. Human activity impacts seemed to be the main factor determining the waterbird communities as waterbirds were negatively correlated with the greatest anthropogenic impacts. Waterbirds seem to respond rapidly to human disturbance.


Resumo As aves estão entre os melhores bioindicadores, o que pode nos orientar a reconhecer algumas das principais preocupações de conservação dos ecossistemas. Impactos antrópicos como desmatamento, degradação de habitat, modificação de paisagens e diminuição da qualidade dos habitats são as principais ameaças à diversidade de aves. O presente estudo foi desenhado para detectar agentes causadores antropogênicos que atuam na diversidade de aves aquáticas na Represa de Tarbella, rio Indus, Paquistão. Censos de aves aquáticas foram realizados de março de 2019 a fevereiro de 2020 em várias áreas ao redor da barragem. Um total de 2.990 aves aquáticas representando 63 espécies foi registrado. Detectamos a maior riqueza e diversidade de aves aquáticas em Pehure, enquanto a maior densidade foi registrada em Kabbal. Os impactos da atividade humana parecem ser o principal fator determinante das comunidades de aves aquáticas, uma vez que as aves aquáticas foram negativamente correlacionadas com os maiores impactos antrópicos. As aves aquáticas parecem responder rapidamente às perturbações humanas.

4.
Braz J Biol ; 84: e255692, 2022.
Article in English | MEDLINE | ID: mdl-35584457

ABSTRACT

The current research was designed to reach extracellular protease production potential in different strains of Sordaria fimicola which were previously obtained from Dr. Lamb (Imperial College, London) from North Facing Slope and South Facing Slope of Evolution Canyon. After initial and secondary screening, two hyper-producers strains S2 and N6 were selected for submerged fermentation and cultural conditions including temperature, pH, incubation period, inoculum size, substrate concentration, and different carbon and nitrogen sources were optimized for enzyme production. S2 strain showed maximum protease production of 3.291 U/mL after 14 days of incubation at 30 °C with 7 pH, 1% substrate concentration and 1 mL inoculum, While N6 strain showed maximum protease production of 1.929 U/mL under fermentation optimized conditions. Another aim of the present research was to underpin the biodiversity of genetics and post-translational modifications (PTMs) of protease DPAP (peptidyl-aminopeptidase) in Sordaria fimicola. Five polymorphic sites were observed in amino acid sequence of S. fimicola strains with reference to Neurospora crassa. PTMs prediction from bioinformatics tools predicted 38 phosphorylation sites on serine residues for protease peptidyl-aminopeptidase in S1 strain of S. fimicola while 45 phosphorylation sites on serine in N7 strain and 47 serine phosphorylation modifications were predicted in N. crassa. Current research gave an insight that change in genetic makeup effected PTMs which ultimately affected the production of protease enzyme in different strains of same organism (S. fimicola). The production and molecular data of the research revealed that environmental stress has strong effects on the specific genes through mutations which may cause genetic diversity. S. fimicola is non- pathogenic fungus and has a short life cycle. This fungus can be chosen to produce protease enzyme on a commercial scale.


Subject(s)
Aminopeptidases , Peptide Hydrolases , Sordariales , Aminopeptidases/genetics , Fermentation , Hydrogen-Ion Concentration , Peptide Hydrolases/genetics , Serine , Sordariales/enzymology , Sordariales/genetics
5.
Braz J Biol ; 84: e251197, 2021.
Article in English | MEDLINE | ID: mdl-34852136

ABSTRACT

Birds are among the best bio-indicators, which can guide us to recognize some of the main conservation concerns in ecosystems. Anthropogenic impacts such as deforestation, habitat degradation, modification of landscapes, and decreased quality of habitats are major threats to bird diversity. The present study was designed to detect anthropogenic causative agents that act on waterbird diversity in Tarbella Dam, Indus River, Pakistan. Waterbird censuses were carried out from March 2019 to February 2020 in multiple areas around the dam. A total of 2990 waterbirds representing 63 species were recorded. We detected the highest waterbird richness and diversity at Pehure whereas the highest density was recorded at Kabbal. Human activity impacts seemed to be the main factor determining the waterbird communities as waterbirds were negatively correlated with the greatest anthropogenic impacts. Waterbirds seem to respond rapidly to human disturbance.


Subject(s)
Ecosystem , Rivers , Conservation of Natural Resources , Humans , Pakistan
6.
Popul Bull ESCWA ; (29): 67-75, 1986 Dec.
Article in English | MEDLINE | ID: mdl-12268757

ABSTRACT

Global and regional population projections produced by the United Nations are evaluated and compared with actual population estimates. While general observations pertaining to the global level are made, the focus is on Latin America for selected years from 1950 to 1980. It is found that "the quality of population projections improved since 1950. In addition, short-term projections are found to be relatively more accurate than those for the long-term.... In the medium- or long-term projections, at least in the Latin American case, the assumptions regarding mortality were far from the real situation. The important factors in the projections are found to be in the order of base population, fertility and mortality."


Subject(s)
Evaluation Studies as Topic , Fertility , Forecasting , Mortality , Population Density , Population Dynamics , Statistics as Topic , Americas , Caribbean Region , Central America , Demography , Developed Countries , Developing Countries , Latin America , North America , Population , Research , South America , Time Factors
7.
Notas Poblacion ; 8(22): 67-83, 1980.
Article in Spanish | MEDLINE | ID: mdl-12311278

ABSTRACT

"The purpose of this paper is to compare population projections prepared by the United Nations in the 1950's with the actual estimates for the countries and the regions of Central (including Mexico) and South America. The comparison is made in terms of (a) base population used in the projections (1950), (b) the projected and the estimated population for 1980, and (c) the projected and the estimated rates (including rates of growth) and numbers of births, deaths and migration over the 30 year period of the projections (1950-1980)." (SUMMARY IN ENG)


Subject(s)
Forecasting , Population Growth , Developing Countries , Latin America , Research , Statistics as Topic
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