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Carotenoids comprise one of the most widespread classes of pigments found in nature. Polyene pigments from the dinoflagellate Gonyaulax polyedra were extracted every hour over a 24 hour period and the levels of beta-carotene during the day-phase were found to be twice as high as during the night-phase period. Using the thermal decomposition of 1,4-dimethylnaphthalene endoperoxide, the overall quenching ability of beta-carotene and G. polyedra carotenoids of singlet oxygen were found to be 2.04 x 10(9) M-1 s-1 and 4.75 x 10(9) M-1 s-1 respectively. Such a high quenching rate constant suggest a possible role for carotenoids as effective singlet oxygen quenchers in G. polyedra. The dose response curve for light-induced carotenoid synthesis shows a linear response up to 45 minutes of light exposure, after which night phase cells contain the same levels of beta-carotene as day-phase cells. Cells exposed to light pulses at different times during the night period display the highest beta-carotene induction in the middle of the night.

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On 2016 the 17 United Nations Sustainable Development Goals (SDGs) of the 2030 Agenda officially came into force proposing that Governments can work to promote inclusive and sustainable economic growth, employment and decent work for all. This study aims to analyze the contribution of Residential Elderly Care Center -RECC to promote SD along with social support in urban centers of megacities. Considering that the current scenario presents: longer life expectancy and increasing numbers of older people; the growing presence of women in the market and the hierarchy of companies making more and more difficult for them to stay at home as well as the failure of public care structure to respond adequately to citizens' demands new business models are welcome. While the families are getting smaller which removes potential caregivers within them, conversely mobility issues among peripheral areas and public institutions are increasing. Large arrangements for caring can be useful in some contexts, but generally, require commuting from home to the support structure and new public and private investments. The potential reduction of human daily dislocations could improve the environment and life quality in megacities in many aspects: decreasing vehicles CO2 emissions, pollution and the volume of traffic; giving practicality to everyday life of families with dependent members of care and generating new opportunities of small business. In addition, this new residential structures employment might reduce the need to shift the caregivers themselves to their work place, strengthen community bounds and not require immobilization of new properties of the exclusive use for Care centers in highly urbanized areas. The methodology used in this paper is based in the exploratory-descriptive and bibliographical-documentary method. Results of the study are corroborate by a series of complementary research of the authors. Conceptual stepby-step flowchart to assist an entrepreneur to open a RECC is described.