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Instituto de Biologia Unicamp







ABSTRACTA (3) 2000

Artigos Publicados em Periódicos

P040-00 Estrutura e dinâmica de uma população de Collophyllum brasiliense em uma floresta higrófila do sudeste do Brasil Marques MCM, Joly CA* Age and spatial structures of a population of Calophyllum brasiliense (Clusiaceae) were studied in a 3600 m2 area of a swamp forest in Brotas, São Paulo State. During the first census, 1658 plants were tagged and after one year this number increased to 1706. Seedling (29.7%) and juvenile (5.3%) mortality was caused, mainly, by soil erosion and deposition during the rainy season, because the plants were buried. Subadult (0.7%) and adult (0%) mortality was very low. A large number of new seedlings was concentrated in the lower parts of the study site and in soil depressions where the water carried seeds which were deposited and germinated. Recruitment rate for seedlings was high (48.1%), while for juvenile (7.3%), subadult (1.9%) and adult (0%) were much lower. Plants of all classes, from seedlings to adults, presented a clustered distribution, due to the topography of the study site, which facilitates seed accumulation, and to a higher number of seeds under the canopy of reproductive individuals. Fruit dispersion by bats or water, seed survival under hypoxic conditions, seedling tolerance to waterlogging, age structure with a significant predominance of seedlings and population growth explain why C. brasiliense is the most abundant species in the forest studied and also in other similar forests in Southeastern Brazil. Revista Brasileira de Botânica 23(1): 107-112, 2000. *E-mail:

P041-00 Estrutura da Mata da Silvicultura, uma floresta estacional semidecidual Montana no município de Viçosa, MG Meira-Neto JAA, Martins FR* Revista Árvore 24(2): 151-160, 2000. *E-mail:
P042-00 Ecophysiology and respiratory metabolism during the germination of Inga sessilis (Vell.) Mart. (Mimosacea) seeds subjected to hypoxia and anoxia Okamoto JM, Joly CA* This paper presents a study on the respiratory metabolism of germinating seeds of Inga sessilis subjected to normoxia, hypoxia and anoxia. Although it is typical of environments where waterlogging seldom occurs, 40% of its seeds are able to germinate under hypoxia; yet, anoxia periods over 96 h are lethal to the seeds. Ethanol is the main product of the seeds anaerobic metabolism, but the steep increase in lactate after 24 anoxia or 48 h hypoxia may explain the drop in seed viability. Revista Brasileira de Botânica 23(1): 51-57, 2000. *E-mail:
P043-00 Nova espécie do gênero Ichthyocthere (Heliantheae-Asteraceae) Pereira RCA, Semir J* Bradea 8(28): 155-158, 2000. *E-mail:
P044-00 A new species of Chaetostoma (Melastomataceae) from Minas Gerais, Brazil Romero R, Martins AB* Candollea 54(2): 449-452, 2000. *E-mail:
P045-00 Growth and leaf demography of two Cecropia species Santos FAM* Alometria, crescimento e demografia de folhas de uma espécie de Cecropia associada com formigas (C. glazioui) e outra não (C. hololeuca), foram estudadas em área de floresta Pluvial Atlântica, no SE Brasil. As relações entre os diâmetros dos caules e as alturas das plantas foram semelhantes nas duas espécies. Cecropia glazioui apresentou maior crescimento anual e entrenós maiores que C. hololeuca. A emerg6encia e a mortalidade de folhas foram sazonais nas duas espécies, sendo o número de folhas mais variável ao longo do ano em C. hololeuca que em C. glazioui. As curvas de sobrevivência de folhas foram intermediárias entre os Tipo I e Tipo II de Deevey, sendo que folhas jovens de C. glazioui apresentam probalidade de sobrevivência e expectativas de vida maiores que as de C. hololeuca. A produção de folhas menos variável durante o ano, e a maior sobrevivência de folhas novas em C. glazioui podem estar relacionadas à associação com formigas. Revista Brasileira de Botânica 23(2): 133-141, 2000. *E-mail:
P046-00 The pollination of Stenorrhynchos lanceolatus (Aublet) L. C. Rich. (Orchidaceae: Spiranthinae) by hummingbirds in southeastern Brazil Singer RB, Sazima M* Hummingbird pollination is documented for a natural population of Stenorrhynchos lanceolatus Aublet. L. C. Rich. occurring in Rio de Janeiro State, southeastern Brazil. The plants are pollinated by Phaethornis eurynome (Phaethorninae), Thalurania glaucopis (females only) and Leuchochloris albicollis (Trochilinae). The plants offer nectar as a reward and the pollinaria become stuck to the surface of the hummingbirds. The orchid population received a few (0-4) hummingbird visits per day, with about 83% of the flowers being pollinated. In spite of the low frequency of visits, the granular structure of the pollinarium plus the behaviour of the most frequent pollinators, a very high fruiting success was promoted. The pollinaria may remain up to 6.30 hours on the hummingbird's bill, enhancing the chances of cross-pollination and long-distance pollen flow. Plant Systematics and Evolution :221-227, 2000. IF= *E-mail:
P047-00 Anatomia do eixo vegetativo de Dahlstedtia pinnata (Benth.) Malme e D. pentaphylla (Taub.) Burk. (Leguminosae, Papilionoideae) Teixeira SP*, Gabrielli AC Revista Brasileira de Botânica 23(1): 1-11, 2000. *Phone: 3788-7844
P048-00 Secretory cavities and pellucid dots in leaflets of Lonchocarpus (Leguminosae, Papilionoideae, Millettieae) Teixeira SP, Castro MM, Tozzi AMGA* The occurrence of leaflet secretory cavities in 23 Brazilian species of Lonchocarpus was surveyed anatomically and compared with data from external morphology to evaluate their taxonomic significance. This study reveald three cases: presence of secretory cavities associated with pellucid dots, pellucid dots corresponding to false secretory cavities, and absence of pellucid dots and secretory cavities. These results indicate that in this genus the "glandular pellucid dots" cited in morphological descriptions do not always correspond to secretory cavities, and that their nature must always be confirmed by histological sections. Secretory cavities have systematic significance at subgeneric taxonomic level for the genus Lonchocarpus. Plant Systematics and Evolution 221(1-2): 61-68, 2000. IF = 1.302 *E-mail:
P049-00 Structural and functional characterization of myotoxin I, a Lys49 phospholipase A(2) homologue from Bothrops moojeni (Caissaca) snake venom Soares AM, Andriao-Escarso SH, Angulo Y, Lomonte B, Gutierrez JM, Marangoni S*, Toyama MH, Arni RK, Giglio JR Myotoxin-I (MjTX-I) was purified to homogeneity from the venom of Bothrops moojeni by ion-exchange chromatography on CM-Sepharose. Its molecular weight was estimated by SDS-PAGE. Protein sequencing indicated that MjTX-I is a Lys49 myotoxin and consists of 121 amino acids, containing a high proportion of basic and hydrophobic residues. It shares a high degree of sequence identity with other Lys49 PLA(2)-like myotoxins, but shows a significantly lower identity with catalytically active Asp49 PLA(2)s. The three-dimensional structure of MjTX-I was modeled based on the crystal structures of three highly homologous Lys49 PLA(2)-like myotoxins.. Although the myotoxic and lethal activities of the modified toxins were reduced by these treatments, neither its edema-inducing or Liposome-disrupting activities were significantly altered. Rabbit antibodies to native MjTX-I cross-reacted with the chemically modified forms, and both the native and modified MjTX-I preparations were recognized by antibodies against the C-terminal region 115-129 of myotoxin II from B. asper, a highly Lys49 PLA(2)-homologue with high sequencial similarity. Archives of Biochemistry and Biophysics 373(1): 7-15 , 2000. IF = 2.386 *E-mail:

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