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| Registros recuperados: 219 | |
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| AFFONSO,Elizabeth Gusmão. |
| Hematological parameters, intraerythrocytic phosphates, hemoglobin, and whole blood Bohr effect of the South American armored catfish Hoplostenum littorale were studied during different seasons of the year. In addition, the degree of dependence on air breathing was determined for this species. The hematological parameters presented seasonal variations, which were not correlated to oxygen, temperature, and water level oscillations. Five anodic hemoglobin fractions were detected in starch gel electrophoresis. In addition to ATP, GTP and Fe-GTP being detected, 2,3-DPG was also detected in red blood cells of H. littorale. The latter is an intraerythrocytic phosphate characteristic to red blood cells of mammalians. The increased production of 2,3-DPG could be... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adaptation; Air-breathing behavior; Hematology; Intraerythrocytic phosphate; Blood Bohr effect. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672001000200249 |
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| RIVERA MÉNDEZ,YURANY DAYANNA; MORENO CHACÓN,ANDRÉS LEONARDO; ROMERO,HERNÁN MAURICIO. |
| The interspecific hybrid, Elaeis oleifera x Elaeis guineensis (OxG) is an alternative for improving the competitiveness and sustainability of the Latin American oil palm agro-industry, because of its partial resistance to some lethal diseases and also because of the high quality of its oil. A comparative characterization was conducted of the physiological and biochemical performance of seedlings of six OxG hybrids grown in hydroponics. Gas exchange, vegetative growth, protein, sugar and photosynthetic pigment content, and antioxidant system activity were determined. With the exception of gas exchange, the other variables showed significant differences between materials. The ´U1273´ and ´U1737´ materials showed greater vegetative growth with no expression... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adaptation; Growth; Nutrient solution; Plant breeding; Stress. |
| Ano: 2013 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2013000300005 |
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| Silva Filho, Florisval Protásio; Universidade Federal Rural de Pernambuco; Azevedo, Marcílio de; Universidade Federal Rural de Pernambuco; Costa, Lígia Alexandrina Barros da; Universidade Federal Rural de Pernambuco; Lana, Ângela Maria Quintão; Universidade Federal de Minas Gerais; Ferreira, Marcelo de Andrade; Universidade Federal Rural de Pernambuco; Batista, Ângela Maria Vieira; Universidade Federal Rural de Pernambuco. |
| This study evaluated the influence of coat color on the heat tolerance and performance of 21 Santa Inês lambs, non-pregnant, non-lactating, seven animals of each coat color: black, brown and white, with an average initial weight of 25.71, 24.85 and 25.00 kg, for white, brown and black animals, respectively, and 12 months of age. The study was conducted during summer in the agreste region of Pernambuco State, Brazil. Twenty-one sheeps were assigned to a completely randomized design with three treatments and seven replicates. The heat tolerance index and the animal performance were evaluated once a week for eight weeks. White sheep were slightly superior in heat tolerance to brown and black sheep, 88.3, 85.5 and 86.6 respectively, but this was not... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adaptation; Bioclimatology; Climate; Heat stress. |
| Ano: 2013 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/18466 |
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| SANTOS,LEONARDO D.T.; CRUZ,LEANDRO R. DA; SANTOS,SAMUEL A. DOS; SANT'ANNA-SANTOS,BRUNO F.; SANTOS,IZABELA T. DOS; OLIVEIRA,ARIANE M. DE; BARROS,RODRIGO E.; SANTOS,MÁRCIA V.; FARIA,RODRIGO M.. |
| Plants have the ability to undergo morphophysiological changes based on availability of light. The present study evaluated biomass accumulation, leaf morphoanatomy and physiology of Neonotonia wightii andPueraria phaseoloides grown in full sunlight, as well as in 30% and 50% shade. Two assays were performed, one for each species, using a randomized block design with 10 replicates. A higher accumulation of fresh mass in the shoot of the plants was observed for both species under cultivation in 50% shade, while no differences were detected between the full sunlight and 30% shade. N. wightii and P. phaseoloides showed increase in area and reduction in thickness leaf when cultivated in 50% shade. There were no changes in photosynthetic rate, stomatal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adaptation; Fabaceae; Morphophysiology; Shading. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100519 |
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| Melo,J.F.B.; Lundstedt,L. M; Inoue,L.A.K.; Metón,I.; Baanante,I.V.; Moraes,G.. |
| ABSTRACT The activities of enzymes from a number of metabolic pathways have been used as a tool to evaluate the best use of nutrients on fish performance. In the present study the catfish Rhamdia quelen was fed with diets containing crude protein-lipid-carbohydrate (%) as follows: treatment (T) T1: 19-19-44; T2: 26-15-39; T3: 33-12-33; and T4: 40-10-24. The fish were held in tanks of re-circulated, filtered water with controlled temperature and aeration in 2000L experimental units. The feeding experiment lasted 30 days. The following enzymes of the carbohydrate metabolism were determined: Glucokinase (GK), Phosphofructokinase 1 (PFK-1), Pyruvate kinase (PK), Fructose-1,6-biphosphatase 1 (FBP-1). The activities of 6 phosphogluconate dehydrogenase (6PGDH)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Metabolism; Enzymes; Nutrition; Adaptation. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352016000501251 |
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| Ramírez-Otárola,Natalia; Sabat,Pablo. |
| Digestive capabilities, such as the rates nutrient hydrolysis and absorption, may affect energy intake and ultimately feeding behavior. In birds, a high diversity in gut biochemical capabilities seems to support the existence of a correlation between the morphology and physiology of the intestinal tract and chemical features of the natural diet. However, studies correlating the activity of digestive enzymes and the feeding habits at an evolutionary scale are scarce. We investigated the effect of dietary habits on the digestive physiological characteristics of eight species of passerine birds from Central Chile. The Order Passeriformes is a speciose group with a broad dietary spectrum that includes omnivorous, granivorous and insectivorous species. We... |
| Tipo: Journal article |
Palavras-chave: Birds; Diet; Intestinal enzymes; Passeriformes; Food habits; Adaptation. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000100011 |
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| Souza,Tamires Teles de; Antolin,Luís Alberto Silva; Bianchini,Vitor de Jesus Martins; Pereira,Rodolfo Armando de Almeida; Silva,Evandro Henrique Figueiredo Moura; Marin,Fábio Ricardo. |
| ABSTRACT Maize (Zea mays) is considered one of the most important crops for world food security. Globally, Brazil is the second largest maize producer and the fourth largest maize consumer. The climate variables is one of the main determining factors for crop yield. Given the possibility of future climate changes, our objective was to evaluate the impact of climate change on maize crop growth and development, assessed strategies to cope with the future crop andto quantify the impacts on various producing regions of Brazil. The DSSAT/CERES-Maize model was calibrated with field data and then used to simulate current and six future climate scenarios, according to the AgMIP protocols. We selected three regional climate circulation models (GCMs) and two... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crop modelling; Food security; Adaptation; Zea mays. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000400622 |
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| Santos,Rodrigo Fernandes dos; Marques,Léo Omar Duarte; Mello-Farias,Paulo; Martins,Carlos Roberto; Konzen,Luis Henrique; Carvalho,Ivan Ricardo; Malgarim,Marcelo Barbosa. |
| ABSTRACT Kiwifruit vines are an alternative approach to diversify Brazilian fruit farming because of the low supply and increase in the demand for their fruits. Hydrogenated cyanamide, which is the most common rest-breaking agent, is highly toxic and its use is not allowed in organic production systems. This study aimed at evaluating the efficiency of alternative rest-breaking agents in kiwifruit vines by using the biological method of single node cutting. Twigs of the cultivar Bruno were collected in an organic orchard in Pelotas, a city located in Rio Grande do Sul state, Brazil. Seven-centimeter-long cuts with a single shoot at the ends were segmented. Cuttings were placed on plastic trays with phenolic foam and soaked in water, at 85% relative humidity... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Actinidia deliciosa; Sustainability; Ecophysiology; Adaptation; Mild winter. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052020005004201 |
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| Wilhelm Filho,D.; Torres,M.A.; Tribess,T.B.; Pedrosa,R.C.; Soares,C.H.L.. |
| The livers of Geophagus brasiliensis collected from both a non-polluted site and a polluted site were analyzed for different antioxidant defenses, O2 consumption, thiobarbituric acid-reactive substance (TBARS) levels, and histological damage. Compared to controls (116.6 ± 26.1 nmol g-1), TBARS levels were enhanced at the polluted site (284.2 ± 25.6 nmol g-1), as also was oxygen consumption (86.6 ± 11.3 and 128.5 ± 9.8 µmol O2 min-1 g-1, respectively). With respect to enzymatic antioxidants, increased catalase activities (8.7 ± 1.3 and 29.2 ± 2.4 mmol min-1 g-1, respectively), unchanged superoxide dismutase activities (767.2 ± 113.3 and 563.3 ± 70.2 U g-1, respectively), and diminished glutathione S-transferase activities (29.0 ± 3.2 and 14.9 ± 3.2 µmol... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oxyradicals; Antioxidant defenses; Fish; Acará; Season; Pollution; Adaptation. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000600004 |
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| Ramirez-Gil,H.; Feldberg,E.; Almeida-Val,V.M.F.; Val,A.L.. |
| Karyological characteristics, i.e., diploid number, chromosome morphology and nucleolus organizer regions (NORs), biochemical characteristics, i.e., electrophoretic analysis of blood hemoglobin and the tissue enzymes lactate dehydrogenase (LDH), malate dehydrogenase (MDH), alcohol dehydrogenase (ADH), and phosphoglucose isomerase (PGI), and physiological characteristics, i.e., relative concentration of hemoglobin and intraerythrocytic concentrations of organic phosphates were analyzed for the species Callophysus macropterus collected from Marchantaria Island (white water system - Solimões River) and Anavilhanas Archipelago (black water system - Negro River). Karyological and biochemical data did not reveal significant differences between specimens... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Callophysus; Fish; Amazon; Population genetics; Adaptation. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998001100014 |
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| Alves,Lucas Bocchini Rodrigues; Freitas Neto,Oliveiro Caetano de; Batista,Diego Felipe Alves; Barbosa,Fernanda de Oliveira; Rubio,Marcela da Silva; Souza,Andrei Itajahy Secundo de; Almeida,Adriana Maria de; Barrow,Paul Andrew; Berchieri Junior,Angelo. |
| Abstract Salmonella Gallinarum is a host-restrict pathogen that causes fowl typhoid, a severe systemic disease that is one of the major concerns to the poultry industry worldwide. When infecting the bird, SG makes use of evasion mechanisms to survive and to replicate within macrophages. In this context, phoPQ genes encode a two-component regulatory system (PhoPQ) that regulates virulence genes responsible for adaptation of Salmonella spp. to antimicrobial factors such as low pH, antimicrobial peptides and deprivation of bivalent cations. The role of the mentioned genes to SG remains to be investigated. In the present study a phoPQ-depleted SG strain (SG ΔphoPQ) was constructed and its virulence assessed in twenty-day-old laying hens susceptible to fowl... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mutation; Virulence; Fowl typhoid; Adaptation; Chickens. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000300601 |
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| Tavares,Adassa Gama; Monte,Daniel Farias Marinho do; Albuquerque,Allan dos Reis; Sampaio,Fábio Correia; Magnani,Marciane; Siqueira Júnior,José Pinto de; Souza,Evandro Leite de. |
| Enterotoxigenic Staphylococcus aureus strains that were isolated from foods were investigated for their ability to develop direct-tolerance and cross-tolerance to sodium chloride (NaCl), potassium chloride (KCl), lactic acid (LA) and acetic acid (AA) after habituation in sublethal amounts (1/2 of the minimum inhibitory concentration - 1/2 MIC and 1/4 of the minimum inhibitory concentration - 1/4 MIC) of Origanum vulgare L. essential oil (OVEO). The habituation of S. aureus to 1/2 MIC and 1/4 MIC of OVEO did not induce direct-tolerance or cross-tolerance in the tested strains, as assessed by modulation of MIC values. Otherwise, exposing the strains to OVEO at sublethal concentrations maintained or increased the sensitivity of the cells to the tested... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Staphylococcus; Adaptation; Essential oil; Oregano. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000300835 |
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| Gomes,Marcelo Pedrosa; Marques,Teresa Cristina Lara Lanza Sa e Melo; Martins,Giordane Augusto; Carneiro,Marília Mercia Lima Carvalho; Soares,Ângela Maria. |
| Physiological and anatomical features of Cd-tolerance in Pfaffia glomerata were examined by exposing plantlets to nutrient solutions with increasing Cd concentrations (0, 15, 45, and 90 µmol Cd L-1), and possible Cd-tolerance markers were established. Cd contents were found to be higher in roots than in shoots. According to the bio-concentration factor data, this species is effectively a Cd-hyperaccumulator, as previously attested. Cd induced the appearance of xeromorphic characteristics in leaves (decreased water potential, increased numbers and decreased stomata size) and increased root endodermis thickness. The enzymatic antioxidant systems of roots and leaves were differently affected by Cd. The coordinated activities of antioxidant enzymes were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adaptation; Cd-oxidative damage; Phytoextraction; Tolerance. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000400008 |
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| Mello,Marcia O.; Silva-Filho,Marcio C.. |
| In this review, plant-insect interaction is discussed as a dynamic system, subjected to continual variation and change. Plants developed different mechanisms to reduce insect attack, including specific responses that activate different metabolic pathways which considerably alter their chemical and physical aspects. On the other hand, insects developed several strategies to overcome plant defense barriers, allowing them to feed, grow and reproduce on their host plants. This review foccuses on several aspects of this complex interaction between plants and insects, including chemical-derived substances, protein-derived molecules and volatile compounds of plants whereas metabolization, sequestration or avoidance are in turn employed by the insects. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adaptation; Co-evolution; Herbivory. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000200001 |
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| Registros recuperados: 219 | |
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