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| Registros recuperados: 14 | |
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| Kerr,Warwick E.. |
| This paper deals with problems on population genetics in Hymenoptera and particularly in social Apidae. 1) The studies on populations of Hymenoptera were made according to the two basic types of reproduction: endogamy and panmixia. The populations of social Apinae have a mixed method of reproduction with higher percentage of panmixia and a lower of endogamy. This is shown by the following a) males can enter any hive in swarming time; b) males of Meliponini are expelled from hives which does not need them, and thus, are forced to look for some other place; c) Meliponini males were seen powdering themselves with pollen, thus becoming more acceptable in any other hive. The panmixia is not complete owing to the fact that the density of the breeding population... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1951 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761951000100014 |
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| Santos,Joselita M. Mendes dos; Contel,Eucleia Primo B.; Kerr,Warwick E.. |
| Resumo Os estudos de laboratório sobre a biologia de A. darling demonstraram que o ciclo biológico de ovo a adulto se faz, em média, em 15,6 dias e com uma taxa de sobrevivência de 57% quando criados de 25 a 28°C. O número médio de ovos por postura foi de 110±50,61 e eclodiram em média 83,31±48,21, com um tempo médio para eclosão de dois dias. O tempo de desenvolvimento de cada estádio imaturo apresentou variações. O 2.° e 3.° estádios larvais apresentaram um tempo de desenvolvimento menor do que o 1.° e 4° estádios. |
| Ano: 1981 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671981000800789 |
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| Santos,Joselita M.M. dos; Contel,Eucleia P.B.; Kerr,Warwick E.. |
| Six esterase isozymes were studied during the development of Anopheles darlingi by using polyacrylamide gel electrophoresis and two different substrates, a-naphthylcelate and a-naphthylpropionate. Esterases 5 and 6'were detected in all developmental stages esterases 1 and 2 were more intensively stained if larvae, while esterases 3 and 4 were better visualized in pupae and adults. Strong differences in intensity of some of the isozymes were observed during the pupal stage.Four out of the six isozymes showed variation in the electrophoretic mobility. Esterase-2 was choosed for genetic studies, because was the best stained isozyme in the gels. Two codominant alleles {Est2*S and Est2*F) code for this polymorphic system, with the Est*S frequency equal to... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1985 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671985000100167 |
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| Londe,Luciana N.; Ueira-Vieira,Carlos; Kerr,Warwick E.; Bonetti,Ana Maria. |
| Caryocar brasiliense (pequi), is one of the main species at the biome of the Brazilian savannah due to its use in culinary, popular medicine, industry in general, and iron and steel industry. At São José do Xingu (MT), a tree of C. brasiliense without thorn at the endocarp was found, which enables the improvement of C. brasiliense not only for consumption but also to the high appreciation it already has. To detect the existing differences between the pequi with and without the thorn at the endocarp, RADP markers were used. The generated polymorphisms were cloned and sequenced in order to identify the sequences that are responsible for the fenotypical alteration. It was observed that the pequi without thorn is genetically isolated from the other populations... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caryocar brasiliense; Pequi; Thorn; RAPD. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300024 |
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| Ferreira,Amilton; Abdalla,Fábio C.; Kerr,Warwick E.; Cruz-Landim,Carminda da. |
| The anatomy of the internal organs of the male reproductive apparatus (MRA) of adults and pupae was compared among 51 species of bees, including representatives of six families. Four different types of MRA were found. The type I is present in males of the less derived families (Colletidae, Andrenidae, and Halictidae) and is characterized by three seminiferous tubules per testis, which are almost completely enveloped by the scrotal membrane. The type II is an intermediary between types III and I and is present in Melittidae and Megachilidae, as well as in some Apidae studied, being characterized by post-vesicular deferent ducts outside the scrotal membrane and by three or four seminiferous tubules per testis, except for Apis mellifera L., which has a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Accessory gland; Genitalia; Morphology. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2004000500005 |
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| Santana,Flávia A.; Nunes,Francis M.F.; Vieira,Carlos U.; Machado,Maria Alice M.S.; Kerr,Warwick E.; Silva Jr,Wilson A.; Bonetti,Ana Maria. |
| We have compared gene expression, using the Differential Display Reverse Transcriptase - Polymerase Chain Reaction (DDRT-PCR) technique, by means of mRNA profile in Melipona scutellaris during ontogenetic postembryonic development, in adult worker, and in both Natural and Juvenile Hormone III-induced adult queen. Six, out of the nine ESTs described here, presented differentially expressed in the phases L1 or L2, or even in both of them, suggesting that key mechanisms to the development of Melipona scutellaris are regulated in these stages. The combination HT11G-AP05 revealed in L1 and L2 a product which matches to thioredoxin reductase protein domain in the Clostridium sporogenes, an important protein during cellular oxidoreduction processes. This study... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Melipona scutellaris; Gene expression; DDRT-PCR. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100008 |
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| Kerr,Warwick E.. |
| The present work is destinated to prove that the castes : workers and queens, in Melipona bees are due to genetic factors and not to differences in food. 2) Material used: Hives of Melipona quadri-fasciata anthidioides (Lep. 1836), M. schenki schenki (Gribodo, 1893), M. fasciata rufiventris (Lep. 1836), M. quadri-fasciata vicina (Lep. 1836), M. marginata marginata (Lep. 1836), Apis mellifera (L. 1758). 3) It should be pointed out that in Melipona bees there are no royal cells for the queens, but all the cells are of the same size independently of being destinated for workers, queens or drones. The numerous queens which are born are killed soon after emerging from their cells. 4) Changes of feeding in quality and in quantity caused no variation of castes.... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1946 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761946000100015 |
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| Sousa,Cristina S.; Kerr,Warwick E.; Santos,Marlos R.; Arruda,Alcione S.; Spini,Vanessa B. M. G.; Juliatti,Fernando C.; Takatsu,Armando. |
| Este trabalho teve como objetivo estabelecer metodologias adequadas para o isolamento e inoculação de Septoria lactucae e avaliação de nove cultivares de alface (Lactuca sativa), Vitória-de-Santo-Antão, Uberlândia 10.000, Maioba, Elba, Aurélia, Black Seeded Simpson, Grand Rapids, Salad Bowl-Mimosa e Babá de Verão, quanto aos níveis de resistência à septoriose, em condições de casa de vegetação e campo. Os melhores resultados obtidos foram: a) para isolamento: transferência dos cirros de conídios diretamente para o meio de BDA com os antibióticos estreptomicina, cloranfenicol, ampicilina e rifampicilina; b) para inoculação: aspersão das plantas no estádio de seis a oito folhas com a suspensão de inóculo na concentração de 1 x 10(4)conídios/ml, e manutenção... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Septoriose; Septoria lactucae; Lactuca sativa. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582003000500016 |
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| Sousa,Neila C. de; Rezende,Alexandre A.A. de; Silva,Regildo M.G. da; Guterres,Zaira R.; Graf,Ulrich; Kerr,Warwick E.; Spanó,Mário A.. |
| The wing Somatic Mutation and Recombination Test (SMART) in D. melanogaster was used to study genotoxicity of the medicinal plant Tabebuia impetiginosa. Lapachol (naphthoquinone) and β-lapachone (quinone) are the two main chemical constituents of T. impetiginosa. These compounds have several biological properties. They induce apoptosis by generating oxygen-reactive species, thereby inhibiting topoisomerases (I and II) or inducing other enzymes dependent on NAD(P)H:quinone oxidoreductase 1, thus affecting cell cycle checkpoints. The SMART was used in the standard (ST) version, which has normal levels of cytochrome P450 (CYP) enzymes, to check the direct action of this compound, and in the high bioactivation (HB) version, which has a high constitutive level... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genotoxicity; Synergistic effect; Somatic mutation and recombination test - SMART; Toxicity; Wing spot test. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200027 |
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| Absy,Maria Lúcia; Bezerra,Eronildo Braga; Kerr,Warwick E.. |
| Resumo Analisa-se o néctar de 302 abelhas de Melipona seminigra merrillae Cock. e 302 de abelhas de Melipona rufiventris paraensis Ducke, durante o período de maio de 1977 a abril de 1978, em Manaus. Do total de amostras estudadas de M. seminigra e M. rufiventris, 16 (5,3%) e 11 (3,6%) respectivamente, não continham pólen. Das 286 restantes (94,7%) de M. seminigra, 80 (28%) apresentavam pólen de uma só espécie, 88 (30,8%) de duas espécies e 118 (41,2%) de três ou mais. De 291 (96,4%) restantes de M. rufiventris, 33 (11,3%) apresentavam pólen de uma só espécie, 54 (18,6%) de duas espécies e 204 (70,1%) de três ou mais. Os grãos de pólen encontrados nas amostras de néctar representam ao todo 60 tipos morfológicos, distribuídos em 29 famílias, pelo menos 42... |
| Ano: 1980 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671980000200271 |
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| Brieger,F. G.; Kerr,Warwick E.. |
| Material: Studies were made mainly with Ascaris megalocephála Cloq. univalens and bivalens, and also with Tityus bahiensis Perty. 1) Somatic pairing of heterochromatic regions. The heterochromatic ends of the somatic chromosomes in Ascaris show a very strong tendency for unspecifical somatic pairing which may occur between parts of different chromosomes (Figs. 1, 2, 3, 7, 10, 11, 12, 13, 14, 16, 18,), between the two ends of the same chromosome either directly (Figs. 4, 5, 7, 8, 11, 12, 13, 15, 16, 17, 18) or inversely (Fig. 8, in the arrow) and also within a same chromosomal arm (Fig. 6). 2) During the early first cleavage division the chomosomes are an isodiametric cylinder (Figs. 6, 9, 11, 13, 14). But in later metaphase the ends become club shaped... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1949 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761949000100015 |
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| Registros recuperados: 14 | |
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