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Photoperiod affects distribution of dynorphin A in the brain of Siberian hamster

100%

Meyza K. Z., Sotowska-BrochockaJ.

Dynorphin A1?17 (DYN A1?17) acting in the CNS is known to affect thermoregulation, water and energy balance in the short time scale. In this study a long-term alteration of these functions induced by changes of day length in the highly photoperiodic species, the Siberian hamster (Phodopus sungorus) was studied using immunohistochemistry for DYN A1?17. We found that in the long day (LD, L:D 16 h:8 h) more brain areas express DYN A1?17 peptide than in the short day (SD, L:D 8 h:16 h) conditions. Structures of the hypothalamo-pituitary axis as well as cells of the ependyma, subcomissural organ and choroid plexus of the lateral and third brain ventricles are immunoreactive to anti-dynorphin IgG only in the LD. This might indicate a seasonal regulatory role of DYN A1?17 in physiological adaptations to severe climate changes.

Long-term in vitro storage of shoot explants at temperatures above 0C

84%

Lisek A., Orlikowska O. T., Orlikowska T.

Biotechnologia

2001

issue 3

134-144

Long-term storage of shoots or nodal buds in vitro, in conditions which retard their growth, may be an alternative or supplementary method in the protection of plant resources and in the production of planting material for elite mother stocks. In this paper we describe the most important factors which influence the survival and further behaviour of stored explants.

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1 Acta Neurobiologiae Experimentalis

1 Biotechnologia

1 2006

1 2001

1 Lisek A.

1 Meyza K. Z.

1 Orlikowska O. T.

1 Orlikowska T.

1 Sotowska-BrochockaJ.

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Photoperiod affects distribution of dynorphin A in the brain of Siberian hamster

Long-term in vitro storage of shoot explants at temperatures above 0C