Decreased flight performance and sperm production in drones of the honey bee (Apis mellifera) slightly infested by Varroa destructor mites during pupal development
Authors: Pedro Duay, D. De Jong, Wolf Engels
We developed a bioassay to measure the flying power of drone, in order to determine which drones could reach a drone congregation area. A wind tunnel was used to test unparasitized drones and drones slightly parasitized by one or two mites during pupal development, and counts were made of the number of spermatozoa that they pr.. Read More»
- Genet. Mol. Res. 1(3):
Transferrin polymorphism in Central Amazon populations of pescada, Plagioscion squamosissimus
Authors: Aylton Saturnino Teixeira, Alan Jamieson and Jos?© Carlos Paula Raposo
lood plasma of 253 specimens from eight population samples of the sciaenid fish, pescada (Plagioscion squamosissimus), caught from four sites in the Central Amazon, was tested for molecular variants of transferrin. Starch gel electrophoresis was used to distinguish six species of transferrin molecules; 12 of the 21 theoretical.. Read More»
- Genet. Mol. Res. 1(3):
Female remating, sperm competition and sexual selection in Drosophila
Authors: Shree Ram Singh, Bashisth N. Singh and Hugo F. Hoenigsberg
Female remating is fundamental to evolutionary biology as it determines the pattern of sexual selection and sexual conflict. Remating in females is an important component of Drosophila mating systems because it affects sperm usage patterns and sexual selection. Remating is common in females of many species of Drosophila in bot.. Read More»
- Genet. Mol. Res. 1(3):
Genetic transformation of the lettuce cultivar Grand Rapids (Lactuca sativa L.) by Agrobacterium tumefaciens to improve osmotic stress tolerance (Transforma?§?£o gen?©tica de alface (Lactuca sativa L.), cultivar â??Grand Rapidsâ?, via Agrobacterium tumefaciens, para melhoramento de toler?¢ncia ao estresse h?drico)
Authors: Marcos Pileggi
-.. Read More»
- Genet. Mol. Res. 1(2):
A model system for testing gene vectors using murine tumor cells on the chorioallantoic membrane of the chick embryo
Authors: Sergio U. Dani and Rachel Espindola
We developed a model system for testing gene vectors, based on the growth of murine tumors on the chorioallantoic membrane (CAM) of embryonic chickens. The ability of selected murine cells to grow on the CAM was rated according to the following criteria: i) formation of tumor masses; ii) metastasis formation; iii) reproducibil.. Read More»
- Genet. Mol. Res. 1(2):
Genotoxic evaluation of the organophosphorous pesticide temephos
Authors: Cl?¡udia Alessandra Fortes Aiub, Elis?¢ngela Cristina Alves Coelho, Eduardo Sodr?©, Luis Felipe Ribeiro Pinto and Israel Felzenszwalb
The chemical compound temephos (0,0,0',0'-tetrametyl-0,0'-thiodi-p-phenylene phosphorothioate) is an organophosphorous pesticide that has been used in Brazil since 1967 in control campaigns against the mosquito Aedes aegypti, the vector of dengue and yellow fever. We used single cell gel electrophoresis (SCGE), SOS/umu and Ame.. Read More»
- Genet. Mol. Res. 1(2):
Varroa-tolerant Italian honey bees introduced from Brazil were not more efficient in defending themselves against the mite Varroa destructor than Carniolan bees in Germany
Authors: M.H. Corr?ªa-Marques, D. De Jong, P. Rosenkranz andL.S. Gon?§alves
In Europe and North America honey bees cannot be kept without chemical treatments against Varroa destructor. Nevertheless, in Brazil an isolated population of Italian honey bees has been kept on an island since 1984 without treatment against this mite. The infestation rates in these colonies have decreased over the years. We l.. Read More»
- Genet. Mol. Res. 1(2):
Apomixis and cassava
Authors: N.M.A. Nassar
Apomixis means seed formation without fertilization. In cassava (Manihot esculenta) it is an alternative to reproduction by cuttings, which normally transmits pathogens and leads to an accumulation of viral and bacterial diseases. Apomixis also assures preservation of heterosis and avoids genetic segregation. It occurs in wild.. Read More»
- Genet. Mol. Res. 1(2):
Frequency of the hypervariable DNA loci D18S849, D3S1744, D12S1090 and D1S80 in a mixed ancestry population of Chilean blood donors
Authors: M. Acu?±a, H. Jorquera, L. Cifuentes and L. Armanet
Blood donors (N = 150) at San José Hospital (Santiago, Chile) were typed for one VNTR locus (D1S80) and three STR loci (D18S849, D3S1744, D12S1090). A questionnaire was used to determine the socioeconomic level of the donors, because it is known that some genetic markers (e.g., the ABO and Rh groups) are differentially .. Read More»
- Genet. Mol. Res. 1(2):
Cell nucleus activity during post-embryonic development of Apis mellifera L. (Hymenoptera:Apidae). Intranuclear acid phosphatase
Authors: Carminda da Cruz Landim, Rejane Daniele Reginato, Regina Lucia Morelli Silva de Moraes and Vagner Melo Cavalcante
We report nuclear acid phosphatase activity in the somatic (intra-ovariolar and stromatic) and germ cells of differentiating honey bee worker ovaries, as well as in the midgut cells of metamorphosing bees. There was heterogeneity in the intensity and distribution of electron dense deposits of lead phosphate, indicative of acid.. Read More»
- Genet. Mol. Res. 1(2):