Schwannoma Of The Craniocervical Junction: Surgical Approach Of Two Cases

We report two cases of craniocervical junction schwannomas with a special focus on the surgical approach. The patients underwent a far-lateral approach in the sitting position that facilitated the lesion removal. This report is meant to improve the understanding of this surgical technique as well as improve awareness of its usefulness for similar cases.6103:00:00639641Baldwin, H., Christopher, G., The far lateral/combined supra- and infratentorial approach (1994) J Neurosurg, 81, pp. 60-68Oliveira, E., Rhoton A.L., Jr., Peace, D., Microsurgical anatomy of the region of the foramen magnum (1985) Surg Neurol, 24, pp. 293-352Salas, E., Sekhar, L.N., Ziyal, I.M., Caputy, A.J., Wright, D.C., Variations of the extreme-lateral craniocervical approach: Anatomical study and clinical analysis of 69 patients (1999) J Neurosurg, 90 (SPINE 2), pp. 206-219Martins, R.S., Suzuki, S.H., Sanematsu P., Jr., Plese, J.P.P., Acoustic neuroma in children without association with neurofibromatosis: Report of two cases (1999) Arq Neuropsiquiatr, 57, pp. 96-100Neto, P.M.A., Stamm, A.C., Braga, F.M., Mandibular trigeminal schwannoma: Case report (2001) Arq Neuropsiquiatr, 59, pp. 959-963Siqueira, M.G., Jennings, E., Moraes, O.J.S., Naso-ethmoid schwannoma with intracranial extension: Case report (2001) Arq Neuropsiquitr, 59, pp. 421-423Andrade, G.C., Neto, P.M.A., Braga, F.M., Thalamic intracerebral schwannoma: Case report (2002) Arq Neuropsiquiatr, 60, pp. 308-313Rhoton A.L., Jr., The far-lateral approach and its transcondylar, supracondylar, and paracondylar extensions (2000) Neurosurgery, 47, pp. 195-210Spetzler, R.F., Grahm, T.W., The far-lateral approach to file inferior clivus and the upper cervical region technical note (1990) BNI Quarterly, 6, pp. 35-38Samii, M., Klekamp, J., Carvalho, G., Surgical results for meningiomas of the craniocervical junction (1996) Neurosurgery, 39, pp. 1086-1095Al-Mefty, O., Borba, L.A.B., Aoki, N., Angtuaco, E., Pait, T.G., The transcondylar approach to extradural nonneoplastic lesions of the craniovertebral junction (1996) J Neurosurg, 84, pp. 1-6Bertalanffy, H., Seeger, W., The dorsolateral, suboccipital, transcondilar approach to the lower clivus and anterior portion of the craniocervical junction (1991) Neurosurgery, 29, pp. 815-82

Phase transitions in simplified models with long-range interactions

We study the origin of phase transitions in some simplified models with long range interactions. For the ring model, we show that a possible new phase transition predicted in a recent paper by Nardini and Casetti from an energy landscape analysis does not occur. Instead of such phase transitions we observe a sharp, although without any non-analiticity, change from a core-halo to an only core configuration in the spatial distribution functions for low energies. By introducing a new class of solvable simplified models without any critical points in the potential energy, we show that a similar behaviour to the ring model is obtained, with a first order phase transition from an almost homogeneous high energy phase to a clustered phase, and the same core-halo to core configuration transition at lower energies. We discuss the origin of these features of the simplified models, and show that the first order phase transition comes from the maximization of the entropy of the system as a function of energy an an order parameter, as previously discussed by Kastner, which seems to be the main mechanism causing phase transitions in long-range interacting systems

Validação do QTL PUP1 para tolerância à deficiência de fósforo em arroz de terras altas.

O objetivo deste estudo é validar em progênies S0:2 da população CNA9/3/1 (de seleção recorrente) a presença do QTL Phosphorus uptake 1 (Pup1). Nesse sentido, foram avaliados sete marcadores moleculares codominantes e nove dominantes, específicos para esse QTL

Inibição do crescimento de Cylindrocladium in vitro por isolados de Trichoderma.

bitstream/CENARGEN/29590/1/ct068.pd

Reproductive biology of Pseudotocinclus tietensis (Siluriformes: Loricariidae: Hypoptopomatinae), a threatened fish species

Pseudotocinclus tietensis is endemic to the Upper Tietê River basin and classified as vulnerable. The reproductive biology of this species is still unknown, therefore, we investigated its reproductive strategy and gonad development during its annual reproductive cycle. The fish were collected throughout one year, and histology of the gonads, fecundity and oocyte diameter was conducted. Three phases of gonad maturation were found in males and females (immature, developing, and spawning capable), and the development stages of the gametes were identified within each stage. In the testes, four stages of gamete development were distinguished: spermatogonia, spermatocytes, spermatids and spermatozoa. During spermiation, the spermatozoa were released into the tubular lumen and then continued through the efferent ducts. In the ovaries, five stages of gamete development were identified: chromatin nuclear, perinucleolar, yolk vesicle formation, vitellogenic and ripe. The minimum diameter of ovulating oocytes was 297 µm, and the absolute fecundity was 64 to 306 oocytes. Males with spermatozoa in the lobular lumen and females with vitellogenic and ripe oocytes were found throughout the year. Pseudotocinclus tietensis has asynchronous ovarian development and gametes with fertilization capacity can be eliminated throughout the annual cycle

Competição de cultivares de soja com plantas daninhas em Urutaí, GO.

Objetivou-se nesta pesquisa avaliar o potencial competitivo de cultivares de soja com plantas daninhas em duas épocas de semeadura nas condições edafoclimáticas de Urutaí, GO. O experimento foi conduzido em blocos ao acaso, com quatro repetições em parcelas subsubdivididas. Testou-se nas parcelas duas épocas de semeadura (novembro e dezembro), nas subparcelas as cultivares de soja (BRSGO Raíssa, BRSGO Amaralina, Emgopa 302 RR, BRSGO Indiara, BRS 7560, BRSGO Caiapônia, Pioneer P98Y11 e Pioneer P98C81) e nas subsubparcelas a convivência ou não de plantas daninhas com as cultivares. Quanto às plantas daninhas verificou-se maior ocorrência destas na soja semeada tardiamente. Houve efeito da convivência de plantas daninhas no rendimento de grãos e também interação significativa entre cultivares de soja e época de semeadura, mostrando que a interferência de plantas daninhas com a soja reduziu o rendimento de grãos, principalmente quando a semeadura das cultivares foi realizada em dezembro

Adaptabilidade e estabilidade produtiva de linhagens de soja na Macrorregião sojícola 3, Brasil.

O objetivo deste trabalho foi avaliar a adaptabilidade e estabilidade de 25 genótipos de soja (21 linhagens experimentais e 4 cultivares testemunhas), de ciclo precoce, avaliados em oito locais dentro da Macrorregião sojícola 3 (301, 302, 303 e 304), na safra 2010/2011. Para isso, utilizou-se a análise AMMI (modelo de efeitos principais aditivos e interação multiplicativa), aplicada a dados de rendimento de grãos de ensaios delineados em blocos casualizados, com quatro repetições. Todos os sete eixos principais da análise (IPCAs) estiveram relacionados ao padrão da interação de genótipos com ambientes (GxA), segundo a significância das respectivas somas de quadrados. Com isso, não houve descarte de ruído adicional, além daquele associado ao erro experimental médio, no ajuste das médias de tratamentos (genótipos) e das estimativas de interação GxA. As linhagens G20, G8, G21 e as testemunha G23 e G24 foram as mais estáveis e com boas médias de produtividade (adaptabilidade geral). O ambiente A2 (Rio Verde) foi o mais favorável à manifestação da produtividade dos genótipos, e o ambiente A6 (Itumbiara), aquele com as piores produtividades