Consulta: creatorFacets:"Malaspina,Osmar"
Registros recuperados: 7
Data/hora: 10/06/2024 08:55:38

Antigenotoxicity and antimutagenicity of ethanolic extracts of Brazilian green propolis and its main botanical source determined by the Allium cepa test system
Provedor de dados: 74
Autores: Roberto,Matheus Mantuanelli; Jamal,Cláudia Masrouah; Malaspina,Osmar; Marin-Morales,Maria Aparecida.
Abstract Brazilian green propolis is a resinous substance prepared by bees from parts of the plant Baccharis dracunculifolia. As it possess several biological properties, this work assessed the cytotoxic/anticytotoxic, genotoxic/antigenotoxic and mutagenic/antimutagenic potential of ethanolic extracts of Brazilian green propolis (EEGP) and of B. dracunculifolia (EEBD), by means of the Allium cepa test system. The effects were evaluated by assessing the chromosomal aberrations (CA) and micronuclei (MN) frequencies on meristematic and F1 generation cells from onion roots. Chemical analyses performed with the extracts showed differences in flavonoid quality and quantity. No genotoxic or mutagenic potential was detected, and both extracts were capable of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomal aberration; Micronucleus; Anticlastogenicity; Protective effects; Flavonoids.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572016000200257

Study of the length of the mouthparts of Africanized, Caucasian and Africanized/Caucasian honey bee crosses, and relationships between glossa size  and food gathering behavior
Provedor de dados: 74
Autores: Pignata,Maria Izabel Barnez; Stort,Antonio Carlos; Malaspina,Osmar.
The lengths of the mouthparts of bees, the glossa, paraglossa, stipes, galea, labial palpus, maxillary palpus, cardo, lorum, mentum and prementum, were studied in Caucasian and Africanized bees and in their F1 descendants. Only the lengths of the paraglossa, stipe, galea, mentum, prementum and maxillary palpus differed significantly between these two bee types. These six variables were studied in the F1 descendants of two types of crosses, i.e., Caucasian queens x Africanized males (cross 1) and Africanized queens x Caucasian males (cross 2). Multidimensional analyses were also performed and the generalized Mahalanobis distances (D2) between the F1 descendants and the parental lines were determined. There was an apparent dominance of Africanized bees in...
Tipo: Info:eu-repo/semantics/article
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000400010

Suscetibilidade de operárias e larvas de abelhas sociais em relação à ricinina
Provedor de dados: 76
Autores: Rother,Débora C.; Souza,Tiago F.; Malaspina,Osmar; Bueno,Odair C.; Silva,Maria de Fátima das G. F. da; Vieira,Paulo C.; Fernandes,João B.
Muitas substâncias de origem vegetal podem ser tóxicas ou apresentar potencial inseticida. Com o objetivo de diminuir a problemática da poluição ambiental alguns estudos vêm tentando substituir os inseticidas artificiais pelos inseticidas botânicos. Ricinus communis (Euphorbiaceae) apresenta uma grande variedade de substâncias sendo a ricinina o principal componente tóxico. Considerando que as abelhas são insetos benéficos por atuarem como agentes polinizadores das plantas, este estudo teve por objetivo avaliar o efeito tóxico da ricinina para as operárias e larvas de Apis mellifera (Linnaeus, 1758) (Hymenoptera, Apidae) e Scaptotrigona postica (Latreille, 1907) (Hymenoptera, Meliponini). Para isso, foram realizados testes de ingestão em operárias...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ricinus communi; Apis mellifera; Scaptotrigona postica; Teste de aplicação tópica; Teste de ingestão.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212009000100009

Enfraquecimento e perda de colônias de abelhas no Brasil: há casos de CCD?
Provedor de dados: 86
Autores: Pires,Carmen Sílvia Soares; Pereira,Fábia de Mello; Lopes,Maria Teresa do Rêgo; Nocelli,Roberta Cornélio Ferreira; Malaspina,Osmar; Pettis,Jeffery Stuart; Teixeira,Érica Weinstein.
Resumo: Nas últimas décadas, o declínio de populações de abelhas silvestres e o colapso de colônias de Apis mellifera têm preocupado pesquisadores e apicultores. O objetivo deste artigo de revisão foi compilar alguns dos estudos mais relevantes relacionados às possíveis causas desses problemas - como nutrição, manejo, patógenos, parasitas e efeitos de agrotóxicos -, além de apresentar um breve histórico da síndrome "colony collapse disorder" (CCD) nos Estados Unidos e na Europa. Abordaram-se com mais detalhes os estudos desenvolvidos no Brasil, principalmente sobre agrotóxicos utilizados na agricultura e patógenos e parasitas que acometem as colônias de A. mellifera africanizada. Casos de enfraquecimento, declínio e colapso têm sido registrados,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis melífera; Abelha africanizada; Distúrbio do colapso das colônias; Nutrição de abelhas; Patologia apícola; Polinização.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000500422

Análise de caracteres morfológicos e comportamentais em abelhas africanizadas, caucasianas e em descendentes dos seus cruzamentos
Provedor de dados: 104
Autores: Malaspina,Osmar; Stort,Antonio Carlos; Bueno,Odair Correa.
Twetve external morphological traits and seven traits of food-gathering behavior were studied in africanized and caucasian (A. m. caucasica), bees. Discriminant analysis showed that neither the length of the fourth segment of the abdomen, nor bee weight can be considered as the traits with the highest discriminatory power between africanized and caucasian bees, with any in-bred bees. In the case of in-bred bees the discriminam traits had a lower interorbital width and time to reach the feeder. Multivariate comparisons between the data of in-bred colonies and twenty hibrid colonies, suggest dominance of the genes group of the africanized subspecies.
Tipo: Info:eu-repo/semantics/article
Ano: 1989
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751989000100009

Number of ovarioles in workers descendent from crossings between Africanized and Italian honeybees, Apis mellifera L.: comparison among backcrosses and ancestors colonies
Provedor de dados: 44
Autores: Thuller,Regina H.C.; Malaspina,Osmar; Bueno,Odair C.; Chaud-Netto,José.
A comparative study of ovarioles number in workers of bees, Apis mellifera L. of 36 backcrosses colonies (Africanized and Italian), and stock, inbred and F1 colonies was carried out. No difference on the number of ovarioles in right and left ovaries of workers from the colonies used was detected. The hybrid bees from F1 generation presented from 2 to 31 ovarioles. The number of ovarioles observed in backcrossed Africanized workers varied from 2 to 56 and from 2 to 117 in the Italian ones. The range observed in these bees may be partially explained by the variability registered in stock colonies (Africanized workers: 2 - 16; Italian workers: 6 - 26) and in F1 colonies (2 - 31).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Hymenoptera; Apidae; Ovary; Hybrid bees.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80591998000200010

Variation in honey yield per hive of Africanized bees depending on the introducing time of young queens
Provedor de dados: 65
Autores: Carbonari,Vladson; Malaspina,Osmar; Alves Junior,Valter Vieira; Polatto,Leandro Pereira.
ABSTRACT: The objective of this research was to evaluate the honey production per hive and the egg laying rates of queens produced in 2007, 2008 and 2010. Thirty colonies initiated with a queen per colony at each climatic season were used during the three years. The years, started on January (summer), April (autumn), July (winter) and October (spring) and ended 12 months later, at the same periods related to each season of the later years. Honey supply were weighed before and after centrifugation to evaluate the quantity of the stored honey. Colonies with queens introduced during autumn and winter in the three years produced 57.2±6.0kg and 60.7±7.5kg of honey, respectively. In the first year of production activity, after the introduction of queens in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apiculture; Climatic season; Egg laying rate.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000500895