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Digitale Medien

Seasonal changes in xanthophyll cycle-dependent energy dissipation in Yucca glauca Nuttall (1998)

Adams, W. W. ; Barker, D. H.

Oxford, UK : Blackwell Science Ltd, UK

Plant, cell & environment 21 (1998), S. 0

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ISSN: 1365-3040

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: The evergreen species Yucca glauca was characterized at the end of September and following exposure to low temperatures at the end of November. In November the diurnal pattern of xanthophyll cycle-dependent energy dissipation was altered such that this thermal dissipation process was engaged at a high level throughout the day, whereas in September it only became engaged when leaves received direct sunlight. An analysis of the diurnal partitioning of the absorbed excitation energy into photochemistry versus thermal dissipation suggested that a smaller fraction of that energy was utilized in photochemistry and a greater fraction was dissipated thermally at the end of November compared to September. Lower ratios of Chl a/b and β-carotene/xanthophylls both suggested a decrease in the ratio of reaction centre plus core antenna proteins compared to light-harvesting proteins, and a lower leaf chlorophyll content suggested a decrease in light-harvesting capacity in November versus September. Thus adjustments to the photosynthetic apparatus occurred on several levels in response to the increase in excess excitation energy that Y. glauca experienced during the onset of winter.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1046/j.1365-3040.1998.00283.x

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Digitale Medien

The crystal structure of cytosine (1964)

Barker, D. L. ; Marsh, R. E.

Copenhagen : International Union of Crystallography (IUCr)

Acta crystallographica 17 (1964), S. 1581-1587

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ISSN: 0001-5520

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0365110X64003899

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Digitale Medien

Mammalian Intrafusal Muscle Fibres (1964)

BARKER, D. ; HUNT, J. P.

[s.l.] : Nature Publishing Group

Nature 203 (1964), S. 1193-1193

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] Fig. 1. Transverse sections through the equatorial region of spindles from cat soleus (A), rat rectus femoris (B), and rabbit vastus intermedius (C) muscles. Nuclear-chain muscle fibres (c) outnumber nuclear-bag muscle fibres (&) in the cat (2 bag : 5 chain fibres); are present in equal ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/2031193a0

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