scholarly journals Experimental Determination of Ionization Potentials of Organic Amines, β-Carotene and Chlorophyll a

1974 ◽  
Vol 47 (12) ◽  
pp. 3001-3005 ◽  
Author(s):  
Yoshihiro Nakato ◽  
Takeshi Chiyoda ◽  
Hiroshi Tsubomura
Keyword(s):  
Experimental Determination ◽  
Chlorophyll A ◽  
Ionization Potentials ◽  
Organic Amines ◽  
Β Carotene

scholarly journals PHYSIOLOGICAL AND BIOCHEMICAL CHANGES IN ALGAL CULTURES OF CHLORELLA VULGARIS AND SYNECHOCYSTIS SALINA (MESOPHILIC AND ANTARCTIC ISOLATES) OCCURING AFTER TREATMENT WITH UV-B RADIATION

2017 ◽  
pp. 73-82
Author(s):  
Dilyana Doneva ◽  
Juliana Ivanova ◽  
Lyudmila Kabaivanova
Keyword(s):  
Oxidative Stress ◽  
Chlorophyll A ◽  
Chlorella Vulgaris ◽  
Markers Of Oxidative Stress ◽  
Protective Strategies ◽  
The Antarctic ◽  
Antarctic Algae ◽  
Β Carotene ◽  
Stimulation Of

Determination of biomass production and viability of algal cells of Chlorella vulgaris and Synechocystis salina exposed to UV-B radiation were carried out in this study together with comparison of the mesophilic and antarctic isolates of both investigated strains. Estimation of the content of the pigments: chlorophyll a, chlorophyll b, β-carotene, C-phycocyanin and allo-phycocyanin in algal cells exposed to UV-B radiation was also accomplished. The obtained results showed that the antarctic algae are more resistant to oxidative stress than their mesophilic counterparts. The antarctic isolates of Ch. vulgaris and S. salina compared with the mesophilic ones - up to 72 h showed tolerance to low exposures of radiation, expressed in a slight stimulation of growth and viability of the cells. Antarctic isolates also showed greater resistance to low doses of UV-B radiation manifested by stimulation of the synthesis of chlorophyll a and β-carotene. The registered increase in the amount of C- and allo-phycocyanin in antarctic isolates of S. salina showed that they had developed protective strategies against UV-B radiation by increasing the concentration of the phycobiliproteins. As a result of increased UV-B background, in antarctic isolates, stronger antioxidant defence mechanisms are triggered, which proved the possibility of using them as markers of oxidative stress.

First Experimental Determination of the Ionization Potentials of Berkelium and Californium

1996 ◽  
Vol 35 (2324) ◽  
pp. 2856-2858 ◽  
Author(s):  
Stefan Köhler ◽  
Nicole Erdmann ◽  
Martin Nunnemann ◽  
Günter Herrmann ◽  
Gerhard Huber ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Ionization Potentials

Experimental determination of the ionization potentials of the first five members of the nanodiamond series

2007 ◽  
Vol 127 (8) ◽  
pp. 084320 ◽  
Author(s):  
K. Lenzke ◽  
L. Landt ◽  
M. Hoener ◽  
H. Thomas ◽  
J. E. Dahl ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Ionization Potentials

Vitamin A Value of Plant Food Provitamin A - Evaluated by the Stable Isotope Technologies

2014 ◽  
Vol 84 (Supplement 1) ◽  
pp. 25-29 ◽  
Author(s):  
Guangwen Tang
Keyword(s):  
Stable Isotope ◽  
Vitamin A ◽  
Provitamin A ◽  
Animal Origin ◽  
Plant Food ◽  
Plant Foods ◽  
A Value ◽  
Provitamin A Carotenoids ◽  
Β Carotene

Humans need vitamin A and obtain essential vitamin A by conversion of plant foods rich in provitamin A and/or absorption of preformed vitamin A from foods of animal origin. The determination of the vitamin A value of plant foods rich in provitamin A is important but has challenges. The aim of this paper is to review the progress over last 80 years following the discovery on the conversion of β-carotene to vitamin A and the various techniques including stable isotope technologies that have been developed to determine vitamin A values of plant provitamin A (mainly β-carotene). These include applications from using radioactive β-carotene and vitamin A, depletion-repletion with vitamin A and β-carotene, and measuring postprandial chylomicron fractions after feeding a β-carotene rich diet, to using stable isotopes as tracers to follow the absorption and conversion of plant food provitamin A carotenoids (mainly β-carotene) in humans. These approaches have greatly promoted our understanding of the absorption and conversion of β-carotene to vitamin A. Stable isotope labeled plant foods are useful for determining the overall bioavailability of provitamin A carotenoids from specific foods. Locally obtained plant foods can provide vitamin A and prevent deficiency of vitamin A, a remaining worldwide concern.

Experimental determination of a state equation for dissipative granular gases

1999 ◽  
Vol 96 (6) ◽  
pp. 1111-1116 ◽  
Author(s):  
E. Falcon ◽  
S. Fauve ◽  
C. Laroche
Keyword(s):  
Experimental Determination ◽  
State Equation ◽  
Granular Gases
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