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Instituto de Biologia Unicamp
Abstracta 2002







Artigos Aceito para Publicação

DNA content, chromatin texture and nuclear morphology in benzo[a]pyrene-transformed human breast epithelial cells after microcell-mediated transfer of chromosomes 11 and 17
Mello MLS*, Vidal BC, Lareef MH, Hu YF, Yang X, Russo J
Since abnormal chromosomes 11 and 17 have been associated with neoplastic progression in benzo[a]pyrene-transformed MCF-10F cells, image analysis was used to assess the effect of inserting normal chromosomes 11 and 17 into MCF-10F tumorigenic cells (BP1-E) by microcell-mediated chromosome transfer assay. A tendency of DNA amount distribution and nuclear size restoration to values typical of non-transformed MCF-10F cells was found especially after the transfer of normal chromosome 17. However, data on chromatin texture indicate that a more complex genome balance is required for the nuclear chromatin to recover its normal supraorganization and expression.
Cytometry 52 – Accepted on December 2002.
*E-mail: mlsmello@unicamp.brBehaviour

A004-02 Image analysis of dichroism in silver-impregnated collagen fibers
Vidal BC*
Microscopy & Analysis – Accepted on November 2002

A005-02 Collagen fibers in human prostatic lesions: histochemistry and anisotropies
Taboga SR, Vidal BC*
Journal of Submicroscopic Cytology and Pathology 35 – Accepted on July 2002

A006-02 Experimentally induced heat and cold shock tolerance in adult Panstrongylus megistus (Burmeister)
Garcia SL, Garcia NL, Oliveira LR, Rodrigues VLCC, Mello MLS*
Thermal shock tolerance in domestic male and female adults in comparison to that previously reported for nymphs was studied in P. megistus. The mechanisms that play a role in the cellular protection of this species under sequential temperature shocks were found to loose effectiveness with insect development. When tolerance differed with sex, females showed greater values than males.
Brazilian Journal of Biology 63 - Accepted on January 2002

A007-02 Reversal of denervation-induced insulin resistance by SHIP2 protein synthesis blockade
Bertelli DF, Ueno M, Amaral ME, Toyama MH, Carneiro EM, Marangoni S, Carvalho CR, Saad MJ, Velloso LA, Boschero AC*
Short-term muscle denervation is a reproducible model of tissue specific insulin resistance. To investigate the molecular basis of insulin resistance in denervated muscle the downstream signaling molecules of the insulin-signaling pathway were examined in intact and denervated soleus muscle of rats. Short-term denervation induced a significant fall in glucose clearance rates as detected by euglycemic-hyperinsulinemic clamp, and was associated with significant decrease in insulin-stimulated tyrosine phosphorylation of IR, IRS1 and IRS2 and serine phosphorylation of Akt. Moreover, denervation reduced insulin-induced association between IRS1/IRS2 and p85/PI3-kinase. Denervation caused an increase in IRS1 and IRS2 associated PI3-kinase activity, but the contents of phosphorylated phosphoinositides detected by HPLC were significantly reduced in lipid fractions. No major differences in SHIP2 expression were detected between intact and denervated muscle. However, serine phosphorylation of p85/PI3-kinase was reduced in denervated muscle, while the blockade of SHIP2 expression by antisense oligonucleotide treatment led to partial restoration of phosphorylated phosphoinositide contents and to improved glucose uptake. Thus, modulation of the functional status of SHIP2 may be a major mechanism of insulin resistance induced by denervation.
American Journal of Physiology and Endocrinol Metabolism

A002-02 Interactions between ants, fruits, and seeds in a restinga forest in southeastern Brazil
Passos L, Oliveira PS*
The interactions between ants and non-myrmecochorous diaspores were surveyed in a restinga forest (sandy soil) on the coast of south-eastern Brazil. During 2 y of monthly samplings, 562 interactions involving 48 ant species and 44 species of diaspore were recorded. Ant-diaspore associations involved a considerable part of the ground-dwelling ant community. Large ponerine ants individually removed the diaspores up to 13 m, whereas small ants (myrmicines) normally recruited workers and consumed the diaspore on the spot. Ant-derived benefits to diaspores of non-myrmecochorous plants included secondary dispersal (small to medium-sized diaspores), and increased germination success after seed cleaning by ants. Seedlings of three species were associated with nests of O. chelifer. The results indicate that ants play an important role in fruit/seed biology in the restinga forest.
Journal of Tropical Ecology

A003-02 Maternal care in the Neotropical harvestman Bourguyia albiornata (Arachnida: Opiliones): oviposition site selection and egg protection
Machado G, Oliveira PS*
Females of the harvestman Bourguyia albiornata oviposit almost exclusively inside the tube formed by the curled leaves of the bromeliad Aechmea nudicaulis. Oviposition is not correlated with rainfall or with temperature, but is negatively correlated with the number of individuals of A. nudicaulis emitting flowers. During one year, 83.6% of the females produced only one egg-batch and the remaining produced two or three batches. The mean number of eggs per batch along successive reproductive events decreased significantly. Ants were the most important egg predators group, and at the study site at least 20 species nest and/or forage in A. nudicaulis. Intense predation on eggs by generalist predators may be an important pressure promoting parental care in Neotropical harvestmen.

A008-02 Cytogenetics of a new species of the Paratelmatobius cardosoi group (Anura: Leptodactylidae) with the description of an apparent case of pericentric inversion
Lourenço LB, Garcia PC, Recco-Pimentel SM*

A009-02 Chromosomal differentiation of Hyla nana and Hyla sanborni (Anura, Hylidae), with a description of NOR polymorphism in H. nana
Medeiros LR, Rossa-Feres DC, Recco-Pimentel SM*
Journal of Heredity




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