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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

Efferent Innervation of Mammalian Muscle-spindles (1961)

BARKER, D. ; CHIN, N. K.

[s.l.] : Nature Publishing Group

Nature 190 (1961), S. 461-462

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

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

Notizen: [Auszug] These observations were made during the course of work supported by research grant J5-1806 from the National Institute of Neurological Diseases and Blindness, U.S. Public Health ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/190461a0

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Digitale Medien

Incidence of diabetes amongst people aged 18–50 years in nine British towns: A collaborative study (1982)

Barker, D. J. P. ; Gardner, M. J. ; Power, C.

Springer

Diabetologia 22 (1982), S. 421-425

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ISSN: 1432-0428

Schlagwort(e): Incidence of Type 2 diabetes ; socio-economic environment ; social class

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary The incidence of diabetes among people aged 18–50 years has been studied prospectively in nine towns, chosen to encompass the range of socioeconomic conditions and spread of latitude in England and Wales. The incidence of Type 1 (insulindependent) diabetes in this age group varied little between the towns. However, the incidence of Type 2 (non-insulin-dependent) diabetes was markedly higher in the towns with ‘worse’ socio-economic conditions. The mean incidences were 23 per 100000 for the three ‘worse’ towns and 10 per 100000 for the three ‘better’ towns. This was not explicable by an association between the disease and social class. This finding has to be reconciled with known and hypothesised influences in the aetiology of Type 2 diabetes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00282583

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