New records of Pteridophytes in the semi-arid region of Brazil.

The goal of this paper is to enumerate the pteridophytes that occur in the semi-árid region of the State of Pernambuco, Brazil

Interaction between sucrose and pH during in vitro culture of Nephrolepis biserrata (Sw.) Schott (Pteridophyta).

Interaction between sucrose and pH during in vitro culture of Nephrolepis biserrata (Sw.) Schott (Pteridophyta)). The present work reports the effect of different pH and sucrose concentrations on in vitro propagation of Nephrolepis biserrata. Fronds aseptically obtained from stolon segment culture were cultivated in MS semi-solid medium supplemented with 0, 15, 30, 45 and 60 g.L -1 sucrose and pH adjusted to 3, 5, 7 and 9, in a factorial design. Frond number and length, pinnae number, raquis length and diam eter, fresh and dry matter weight were measured. Inhibition of shoot and leaf regeneration was observed in all the pH treatments in the abs ence of sucrose. On the other hand, when sucrose was added to the medium, the shoot number increased, reaching the maximum average values of 51.25 and 38.25 shoot per explant at pH 5 and 7, respectively. Sucrose concentrations from 15 to 45g.L -1 increased leaf length and diameter and the pH 9 did not affect the dry matter weight, and was still not adequate for development of new fronds. Young sporophytes were successfully acclimated

Número cromossômico de três espécies frutíferas cultivadas no Vale do São Francisco.

Foi realizada a análise citogenética em videira (Vitis vinifera - cultivares de porta-enxerto Salt Creek, Dog Ridge, IAC-766, 420-A e Harmony), goiabeira (Psidium guajava - cultivar Paluma) e bananeira (Musa spp. - cultivar Pacovan) visando utilizar a caracterização cromossômica como ferramenta de apoio aos programas de melhoramento

Resposta de mudas de goiabeira à inoculação com fungos micorrízicos arbusculares em solo infestado com Meloidogyne mayaguensis Rammah & Hirschmann.

Micorrizas são associações entre raízes de plantas e certos fungos do solo. Nessa relação, a planta fornece fotossintatos para o fungo, que em troca cede nutrientes minerais do solo

Single observable concurrence measurement without simultaneous copies

We present a protocol that allows us to obtain the concurrence of any two qubit pure state by performing a minimal and optimal tomography of one of the subsystems through measuring a single observable of an ancillary four dimensional qudit. An implementation for a system of trapped ions is also proposed, which can be achieved with present day experimental techniques.Comment: 4 pages, 1 figur

Armadilha para monitoramento de insetos.

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Aplicação de ácido húmico em mudas enxertadas e micorrizada de uva sem semente (IAC 766/Crimson Seedless), em dois solos do Vale do Submédio São Francisco.

Este trabalho teve como objetivo avaliar o efeito da aplicação de ácido húmico (Codahumus®) em mudas enxertadas de videira (IAC 766/Crimson Seedless) na ausência e na presença de FMA, em dois tipos de solo

Novos sorventes baseados em Poli(Metiloctilsiloxano) sobre sílica para uso em extração em fase sólida.

This paper presents an easy and practical procedure to obtain silica-based C-8 type sorbents for use in solid-phase extraction. The materials are prepared by depositing poly(methyloctylsiloxane), PMOS, on the silica support. Two different treatments for immobilization were used: thermal treatment or gamma irradiation. Suitable recoveries were obtained after pre-concentration of dilute solutions, at the ng/L level, of a mixture of pesticides, indicating the good performance of the materials

Germinação de sementes de croatá (Bromelia karatas L.): espécie nativa da caatinga de potencial econômico.

O presente trabalho teve como objetivo avaliar o comportamento germinativo de sementes de croatá em condições de telado ou de cultivo in vitro, visando o estabelecimento, a multiplicação e o aproveitamento dessa espécie nativa para exploração agronômica