Insight into the studies of the practical use of microalgae in the former Soviet Union

Microalgae have been intensively cultivated and used in the national economy of the Soviet Union in Russia (Moscow, Leningrad, Pushcino, Krasnoyarsk, Irkutsk), the Ukraine, Byelorussia (Minsk), Azerbaijan (Baku), Uzbekistan (Tashkent), Latvia (Riga) and other former Soviet republics. The first studies on the practical use of microalgae started already at the beginning of last century and were connected with treatment of waste water in biological ponds. Ecophysiological studies of marine plankton algae in mono- and mixed cultures as well as in experimental systems with zooplankton organisms started at the end of the 1950s. In the 1960s, started to apply different equipments for cultivation of microalgae in open water basins and closed ecological systems. Research innovations were introduced in agriculture. The productivity of aquatic ecosystems and the distribution of energy within food chains were studied. Intensive research on microalgae continued, paying attention to the chemical composition, physiological and biochemical features. Nutrient supply appeared as one of the main problem for productivity of algal cultures, along with the procession, biochemistry of nutrients and nutrition value of organic matter produced by algae. The most attention was paid to the Chroococcales proteins and possibilities for their use in man-made closed ecological systems. The potential use of microalgae for regeneration of the atmosphere and purification of water in spacecrafts was studied. During the 1970s attention was paid to the role of algae in self-purification processes and biodegradation of surface-active substances in water bodies. Research in microalgae as bioindicators for the assessment of environment quality of aquatic ecosystems and as test objects for biotesting of natural and waste waters was conducted from the 1970s to 1980s.     

Economic development of local communities and biodiversity conservation: a case study from Shennongjia National Nature Reserve,China

Age structure, educational level and economic situation of farmers living in Shennongjia National Nature Reserve, Central China, were analyzed. Results showed that the population will increase steadily in the future and that the educational level is very low on the whole. Among people above the school entrance age (seven years old), only 36% had the opportunity to receive highschool education and those who received college education occupied just about 1%. The income of the local farmers was far below the national average number, which was only 1044.4 RMB (RMB: Chinese Currency, 8.3 RMB=1 US$) per capita in 2001, which is only 44.1% of farmers’ or 15.1% of citizens’ nationwide. Some measures, such as developing featured economies and popularizing effective energy utilization methods, have been proved as successful ways for income growth and environment protection. To cope with the conflicts between community economy development and biodiversity conservation, effective mechanisms, such as Public Compensation, and Community Co-management should be introduced. Sharing favorable policies and reasonably taking advantage of natural resources, the goal of sustainable development of local community economy can be achieved along with the biodiversity conservation.     

Calculation model of CO<Subscript>2</Subscript> emissions for Japanese passenger cars

The quantitative macroscopic model for the CO₂ emission by Japanese passenger cars is proposed in which the CO₂ emission in production, use and end of life stage is analyzed in a different manner from the internationally standardized LCA according to ISO 14040s. Passenger cars are classified into regular cars, compact cars and mini cars based on their air volume displacement. These cars are scrapped from society according to their scrapping rate distribution. The effect of the change in the usage pattern of passenger cars on the amount of CO₂ emission is examined and it turns out that it is not effective enough. Moreover, how much improvement of fuel economy is necessary in order to achieve the goal of the CO₂ emission reduction by COP3 is also estimated. Consequently, it turns out that it must be improved by 2.42 times of the fuel economy in 1995 by the year 2010.     

Transmission of Indigenous Knowledge and Bush Skills Among the Western James Bay Cree Women of Subarctic Canada

The transmission of 93 items of women's indigenous knowledge and bush skills was studied in two subarctic Omushkego (West Main) Cree Indian communities, Moose Factory and Peawanuck, Ontario, Canada. About half of all bush skills were still being transmitted at the hands-on learning stage. Some skills such as setting snares and fishnets, beadwork, smoking geese, and tanning moose and caribou hides were transmitted well. Many skills no longer essential for livelihoods, such as some fur preparation skills and food preservation techniques, were not. Loss of certain skills and incomplete transmission of others (a lower level of mastery than in older generations) were attributable to changes in the educational environment, diminished time available in the bush, problems related to learning bush skills at later ages, and changes in value systems. These factors seemed to impair the traditional mode of education based on participant observation and apprenticeship in the bush, which provided the essential self-disciplining educational environment. Policy measures to counteract these trends may include the institution of a hunters' income security program to provide incentives for family units to go on the land, rather than all-male hunting parties.     

Diurnal export and carbon economy in an expanding source leaf of cucumber at contrasting source and sink temperature

Effects of contrasting temperatures of an expanding leaf (source) and of remaining plant parts (sink) on diurnal export and distribution of carbon were studied in seedlings of Cucumis sativus L., cv. Farbio. The time course of the rate of export was calculated by measuring simultaneously the exchange of ¹⁴CO₂ and the amount of ¹⁴C in the source leaf by means of a Geiger-Müller detector using a steady-state labelling technique. In all treatments average export rate during the night (16 h) was maximally 50% of the average rate during the 8-h day. Temperature affected the diurnal course of export via the source leaf and the sink in different ways. At a source leaf temperature of 25 or 30°C export stopped 12 h after start of the night, whereas at 20°C export continued throughout the night. However, the total amount of carbon exported during a 24 h cycle, expressed as a proportion of the amount of carbon assimilated, was the same at source leaf temperatures of 20 or 30°C. Thus source leaf temperature did not affect the distribution of assimilates between source and sink, in contrast to sink temperature. After 24 h at a sink temperature of 30°C, 20% more ¹⁴C was exported to plant parts below the source leaf than with a sink temperature of 20°C, at the expense of carbon remaining in the source. During the day less starch and more structural dry matter was formed at a source leaf temperature of 30°C than at 20°C. After a complete day/night cycle, however, there was no difference between the treatments. Starch was the primary carbon source during the night, and the decline in the rate of export coincided with the depletion of starch. Thus the decline in the rate of export at a source leaf temperature of 25 or 30°C at 12 h after the start of the night was due to the depletion of starch at that time. Similarly, at 20°C export could continue until the end of the night as the starch degradation supplied assimilates during the whole night.     

New migrant businesses and their workers: developing,but not transforming,the ethnic economy

ABSTRACT

Studies of businesses established by migrants to the UK traditionally stressed co-ethnic relationships as economic resources. More recent work identifies a new ethnic economy characterized by migrants’ common experiences, with ethnicity playing less of a role. The present study complements this newer perspective through investigation of the experiences of forty-nine business owners and sixty of their workers in the West Midlands. Economic relationships were central to the operation of migrant firms, and a minority of firms escaped from sectors traditionally dominated by migrant firms. Yet substantial continuity was also evident, including exclusion from the mainstream on ethnic lines and relations with workers characterized by informality. Migrant business is evolving but it retains many of its features; this pattern can be explained by combining the mixed embeddedness theory of the enterprise with labour process analysis.     

Towards a Circular Economy in Australian Agri‐food Industry: An Application of Input‐Output Oriented Approaches for Analyzing Resource Efficiency and Competitiveness Potential

The food industry in Australia (agriculture and manufacturing) plays a fundamental role in contributing to socioeconomic sectors nationally. However, alongside the benefits, the industry also produces environmental burdens associated with the production of food. Sectorally, agriculture is the largest consumer of water. Additionally, land degradation, greenhouse gas emissions, energy consumption, and waste generation are considered the main environmental impacts caused by the industry. The research project aims to evaluate the eco‐efficiency performance of various subsectors in the Australian agri‐food systems through the use of input‐output–oriented approaches of data envelopment analysis and material flow analysis. This helps in establishing environmental and economic indicators for the industry. The results have shown inefficiencies during the life cycle of food production in Australia. Following the principles of industrial ecology, the study recommends the implementation of sustainable processes to increase efficiency, diminish undesirable outputs, and decrease the use of nonrenewable inputs within the production cycle. Broadly, the research outcomes are useful to inform decision makers about the advantages of moving from a traditional linear system to a circular production system, where a sustainable and efficient circular economy could be created in the Australian food industry.     

Toward a low-carbon and circular building sector: Building strategies and urbanization pathways for the Netherlands

Buildings are an important part of society's environmental impacts, both in the construction and in the use phase. As the energy performance of buildings improve, construction materials become more important as a cause of environmental impact. Less attention has been given to those materials. We explore, as an alternative for conventional buildings, the use of biobased materials and circular building practices. In addition to building design, we analyze the effect of urbanization. We assess the potential to close material cycles together with the material related impact, between 2018 and 2050 in the Netherlands. Our results show a limited potential to close material cycles until 2050, as a result of slow stock turnover and growth of the building stock. At present, end-of-life recycling rates are low, further limiting circularity. Primary material demand can be lowered when shifting toward biobased or circular construction. This shift also reduces material related carbon emissions. Large-scale implementation of biobased construction, however, drastically increases land area required for wood production. Material demand differs strongly spatially and depends on the degree of urbanization. Urbanization results in higher building replacement rates, but constructed dwellings are generally small compared to scenarios with more rural developments. The approach presented in this work can be used to analyze strategies aimed at closing material cycles in the building sector and lowering buildings' embodied environmental impact, at different spatial scales.     

Economic and environmental assessment of automotive plastic waste end-of-life options: Energy recovery versus chemical recycling

Most automotive plastic waste (APW) is landfilled or used in energy recovery as it is unsuitable for high-quality product mechanical recycling. Chemical recycling via pyrolysis offers a pathway toward closing the material loop by handling this heterogeneous waste and providing feedstock for producing virgin plastics. This study compares chemical recycling and energy recovery scenarios for APW regarding climate change impact and cumulative energy demand (CED), assessing potential environmental advantages. In addition, an economic assessment is conducted. In contrast to other studies, the assessments are based on pyrolysis experiments conducted with an actual waste fraction. Mass balances and product composition are reported. The experimental data is combined with literature data for up- and downstream processes for the assessment. Chemical recycling shows a lower net climate change impact (0.57 to 0.64 kg CO₂e/kg waste input) and CED (3.38 to 4.41 MJ/kg waste input) than energy recovery (climate change impact: 1.17 to 1.25 kg CO₂e/kg waste input; CED: 6.94 to 7.97 MJ/kg waste input), while energy recovery performs better economically (net processing cost of −0.05 to −0.02€/kg waste input) compared to chemical recycling (0.05 to 0.08€/kg waste input). However, chemical recycling keeps carbon in the material cycle contributing to a circular economy and reducing the dependence on fossil feedstocks. Therefore, an increasing circularity of APW through chemical recycling shows a conflict between economic and environmental objectives.