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1Author    Kleopatra Schulpis3, A. Rtem Is Doulgerakib, Stylianos TsakirisbRequires cookie*
 Title    Changes of the Brain Synapses During Aging. New Aspects  
 Abstract    The process of brain aging is an interaction of age-related losses and compensatory mechanisms. This review is focused on the changes of the synaptic number and structure, their functional implications, regarding neurotransmission, as well as the electrical activity of neuronal circuits. Moreover, the importance of calcium homeostasis is strongly emphasized. It is also suggested that many neuronal properties are preserved, as a result of adaptive mechanisms, and that a series of interdependent factors regulate brain aging. The "new fron­ tier" in research is the challenge of understanding the effects of aging, both to prevent degen­ erative diseases and reduce their consequences. New aspects are considered a) the role of nitric oxide, b) free radicals and apoptosis, c) impaired cerebral microcirculation, d) m eta­ bolic features of aging brain, e) the possible neuroprotective role of insulin-like growth factor-1 (IGF-1) and ovarian steroids and e) stress and aging. These numerous multifactorial approaches are essential to understand the process of aging. The more we learn about it, the more we realize how to achieve "successful" aging. M inireview 
  Reference    Z. Naturforsch. 56c, 921—929 (2001); received May 15/June 12 2001 
  Published    2001 
  Keywords    Brain, Aging, Synapses 
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 TEI-XML for    default:Reihe_C/56/ZNC-2001-56c-0921.pdf 
 Identifier    ZNC-2001-56c-0921 
 Volume    56 
2Author    S. S. BrodyRequires cookie*
 Title    Effect of Aging on the Fluorescence Lifetime of Chloroplasts  
 Abstract    The lifetime of fluorescence from pea chloroplasts at room temperature increases with age. The ratio of the fluorescence intensities of the slow to fast decay components, decreases with age o f the chloroplasts. This observation can account for the wide range o f lifetimes reported in the literature. The variability of biological material (cultured and prepared with similar procedures) introduces considerable variation in the fluorescence lifetimes measured with pea chloroplasts. Sonication of chloroplasts results in an increase in both the fast and slow fluorescence lifetimes. 
  Reference    Z. Naturforsch. 37c, 881—883 (1982); received January 4/May 24 1982 
  Published    1982 
  Keywords    Photosynthesis, Fluorescence Lifetimes, Aging, Sonicated Chloroplasts 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0881.pdf 
 Identifier    ZNC-1982-37c-0881 
 Volume    37 
3Author    Grzegorz JackowskiRequires cookie*
 Title    Senescence-Related Changes in the Subcomplex Arrangement of the Major Light-Harvesting Chlorophyll a/b-Protein Complex of Photosystem II (LHCII) as Influenced by Cytokinin  
 Abstract    The major light-harvesting chlorophyll a /b -protein complex of photosystem II (LHCII) from fresh barley leaves could be resolved by non-denaturing IEF into five trimeric subcom­ plexes designated 1 -5 in order of decrasing pi value. IEF-based analysis of PSII particles isolated from leaves in which the processes of senescence were induced by detachement and dark-incubation in the presence of water for 0 -8 days let us reveal that substantial rearrangements of LHCII organization took place throughout the course of senescence com ­ prising a step-wise decline in relative abundance of subcom plexes 1 -3 (down to 0-58% of the initial abundance during 8 days of aging) and an increase in the relative abundance of the subcom plexes 4 and 5. Using SDS-PAGE and immunoblot analysis it was shown that the rearrangements were linked to the changes in the relative levels of LHCII apoproteins i.e. 26.7 and 25.6 kDa ones. The changes comprised the preferential disappearance of the 26.7 kDa polypeptide and an enrichment of 25.6 kD a one and most probably reflect the hetero­ geneity among LHCII apoproteins concerning their stability under the conditions of chi loss. Kinetin was able to repress the senescence-related rearrangements in LHCII subcomplex organization at late stages of aging (5 -8 days) by preventing over this time period the disap­ pearance of 26.7 kD a polypeptide and the enrichement of 25.6 kDa one. 
  Reference    Z. Naturforsch. 51c, 464 (1996); received Novem ber 23 1995/ 
  Published    1996 
  Keywords    Aging, Barley, Isoelectric Focusing, Polypeptide, Rearrangement 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0464.pdf 
 Identifier    ZNC-1996-51c-0464 
 Volume    51 
4Author    Stylianos Tsakiris, Panagoula Angelogianni, JohnC. StavridisRequires cookie*
 Title    Effect of Aging on the Activities of Acetylcholinesterase, Na+, K+-ATPase and Mg2+-ATPase in Rat Pituitary and Hypothalamus  
 Abstract    Acetylcholinesterase (A C h E), N a+, K +-ATPase and Mg2+-A TPase activities were esti­ mated in homogenised rat pituitary and hypothalamus of 4-and 22-month-old rats. A C hE activity was not altered in the pituitary of aged com pared to adult rats, while it was found decreased by about 40% in the hypothalamus. N a+,K +-A TPase activity remained stable in the hypothalamus, while it was decreased by about 38% in the pituitary. Mg2+-A TPase activ­ ity remained unchanged in the hypothalamus, but was increased by about 83% in the pitu­ itary. This pituitary N a+, K +-ATPase inactivation may result in pathological mood and de­ creased neural excitability and metabolic energy production in aged animals.The age-related alterations of A C h E , Na+, K +-ATPase and Mg2+-A TPase activities may reflect changes in secretion and responses of some hormones of pituitary and hypothalamus. 
  Reference    Z. Naturforsch. 53c, 168 (1998); received O ctober 13/O ctober 31 1997 
  Published    1998 
  Keywords    Aging, R at Pituitary, Rat Hypothalamus, Acetylcholinesterase, N a+, K +-ATPase, Mg2+-ATPase 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0168.pdf 
 Identifier    ZNC-1998-53c-0168 
 Volume    53