Giardia muris and Giardia duodenalis groups: ultrastructural differences between the trophozoites

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Female reproductive system of the sugarcane spittlebug Mahanarva fimbriolata (Auchenorrhyncha): Vitellogenesis dynamics and protein quantification

The present study aimed describing the ovaries of the sugarcane spittlebug Mahanarva fimbriolata which are meroistic telotrophic with nurse cells and oocytes located in the tropharium. SEM revealed paired ovaries located dorsolaterally around the intestine, and oocytes exhibiting shapes ranging from round (less developed) to elliptic (more developed), suggesting a simultaneous, although, asynchronous development. Based on histological data we classified the oocytes in stages from I to V. Stage I oocytes exhibit follicular epithelium with cubic and/or prismatic cells, fine cytoplasmic granules. Stage II oocytes present intercellular spaces in the follicular epithelium due to the incorporation of yolk elements from the hemolymph. Small granules are present in the periphery of oocytes while larger granules are observed in the center. Stage III oocytes are larger and intercellular spaces in the follicular epithelium are evident, as well as the interface between follicular epithelium and oocyte. Yolk granules of different sizes are present in the cytoplasm. During this stage, chorion deposition initiates. Stage IV oocytes exhibit squamous follicular cells and larger intercellular spaces when compared to those observed in the previous stage. The oocyte cytoplasm present granular and viscous yolk, the latter is the result of the breakdown of granules. Stage V oocytes exhibit a follicular epithelium almost completely degenerated, smaller quantities of granular yolk and large amounts of viscous yolk. Based on our findings we established the sequence of yolk deposition in M. fimbriolata oocyte as follows: proteins and lipids, which are first produced by endogenous processes in stages I and II oocytes. Exogenous incorporation begins in stage III. In stages I and II oocytes, lipids are also produced by follicular epithelial cells. The third element to be deposited is polysaccharides, mainly found as complexes. Therefore, the yolk present in the oocytes of this species consists of glycolipoproteins. Molecular weights of proteins present in M. fimbriolata oocytes ranged from 10 to 92 KDa, differently from vitellogenin, the most common protein present in insect oocytes, weighing approximately 180 KDa. (c) 2006 Elsevier Ltd. All rights reserved.

Aluminum in corn plants: influence on growth and morpho-anatomy of root and leaf

A toxicidade do alumínio (Al) é um dos fatores mais limitantes para a produtividade. Esta pesquisa foi realizada para avaliar a influência do Al, em solução nutritiva, na altura de plantas, no peso da matéria seca e nas alterações morfoanatômicas de raízes e folhas de milho (Zea mays L.). O experimento foi conduzido em casa de vegetação com tratamentos constituídos de cinco doses de Al (0; 25; 75; 150; e 300 µmol L-1) e seis repetições. As soluções foram constantemente aeradas e o pH foi ajustado a 4,3, inicialmente. A matéria seca da parte aérea e das raízes e a altura das plantas diminuíram significativamente com o aumento da concentração de Al. As raízes de plantas de milho cultivadas em soluções com Al tiveram seu crescimento inibido e apresentaram menos raízes laterais e desenvolvimento do sistema radicular inferior, em comparação com as das plantas-controle. As folhas das plantas crescidas em soluções que continham 75 e 300 µmol L-1 de Al não apresentaram muita diferença anatômica em relação às das plantas-controle. A bainha da folha das plantas exposta ao Al apresentou epiderme uniestratificada revestida por uma fina camada de cutícula e as células da epiderme e do córtex foram as que menos se desenvolveram. No feixe vascular, o metaxilema e protoxilema não tinham paredes secundárias, e o diâmetro de ambos foi muito menor quando comparado com os das plantas-controle.

Castes and asynchronous colony cycle in Polybia bistriata (Fabricius) (Hymenoptera: Vespidae)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Foam nest in Scinax rizibilis (Amphibia: Anura: Hylidae)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

New species of Bokermannohyla (Anura, Hylidae) from Central Bahia, Brazil

A new species of treefrog closely related to Bokermannohyla alvarengai is described from Chapada Diamantina centrally located in the State of Bahia, Brazil. In comparison to B. alvarengai, the new species is smaller in size, with less developed forearm and prepollexes, and smaller tympani. We describe the tadpole, advertisement call and provide information on its natural history. We propose the B. alvarengai group to accommodate this species and the new species described here.

A new species of the Bokermannohyla pseudopseudis group from central Bahia, Brazil (Amphibia, Hylidae)

A new species of treefrog is described from Chapada Diamantina in the central State of Bahia, Brazil. The new species is a member of the Bokermannohyla pseudopseudis group, characterized by its small to medium size, head as long as wide, snout short, rounded in dorsal view and nearly truncate in lateral view, eyes and tympanum large, and forearm and prepollex well developed. The new species can be distinguished from the other species of the B. pseudopseudis group by its voice and the shape of its head and snout. it is smaller than B. saxicola and B. pseudopseudis, and has a less developed forearm and prepollex than B. ibitiguara males. The tadpole and vocalizations are described and information on natural history is provided.

Jaw musculature of the Meiglyptini (Aves: Piciformes: Picidae)

The Meiglyptini comprise eight species of woodpeckers grouped into three genera, two of which contain three species ( Meiglyptes and Mulleripicus), while one genus includes two species ( Hemicircus). The purpose of this study is to describe the mandibular apparatus found in six species of Meiglyptini and to compare them with each other and with other woodpecker species. The results reveal a number of structures that are worth mentioning: (i) the components of the external mandibular adductor system of Hemicircus concretus, particularly the M. adductor mandibulae externus caudalis medialis, are underdeveloped compared with the other investigated species; (ii) the muscles of the internal mandibular system are structurally different among Meiglyptes species and are less developed, both in size and in structure, in H. concretus; (iii) the M protractor quadrati is vestigial in Meiglyptes species; (iv) the muscles of the protractor system of the quadrate are relatively undeveloped in H. concretus; (v) most of the muscles of the pterygoideus system are structurally differentiated in Meiglyptes species. It appears that the complexity of the mandibular apparatus is associated with the type of food consumed, as the apparatus of the frugivorous species H. concretus is markedly different from that of the insectivorous species. © 2012 The Royal Swedish Academy of Sciences.

Estratégias de povoamento e despesca no cultivo do camarão-da-amazônia Macrobrachium amazonicum: efeitos na estrutura populacional e na produção

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

A questão regional e o BNDES: uma análise da conformidade entre a atuação do BNDES e a Política Nacional de Desenvolvimento Regional (PNDR)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Fragilidade ambiental e qualidade dos solos em duas bacias hidrográficas de uso rural, em Ibiúna, SP

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Desenvolvimento de plantas de sorgo submetidas a diferentes níveis de lençol freático

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Diferenças no metabolismo das plantas que determinam resistência a herbicidas em Brachiaria plantaginea (Link) Hitchc

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo morfofisiológico dos ovários e do corpo gorduroso do carrapato-estrela Amblyomma cajennense Fabricius (1787) (Acari : Ixodidae)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Ciência e tecnologia X empreendorismo: dialogos possíveis e necessários

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)