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Influence of germination conditions and parameters on the content of total phenolic compounds and scavenging activity in germinated seeds
2020
Bernate, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Food Technology | Sabovics, M., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Food Technology | Tomsone, L., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Food Technology
Consumers are increasingly consuming sprouted seeds due to their low calories content, nutritional value, as well as beneficial effects on human health. Sprouts contain many bioactive compounds such as minerals, fibre, vitamin C, carotenoids and phenolic compounds. The aim of this study was to determine the effects of darkness, light and time total phenolic content and scavenging activity in alfalfa (Medicago sativa), radish (Raphanus sativus), broccoli (Brassica oleracea) and hemp (Cannabis sativa) seeds during germination. The seeds were washed, soaked in water by ratio of 2:1 (water : seeds) for 12±1 h and then germinated in light and dark conditions at a temperature of 22±2 °C and a relative humidity of 85±2% for different times (12, 24, 36 and 48 hours) in a climatic chamber ICH110 (Memmert, Germany). The quality changes of germinated seeds are determined by phenol content and scavenging activity. Un-germinated seeds were used as a control. The results of current studies show that after germination the highest increase in total phenols was in radish, broccoli and alfalfa seeds. The scavenging activity (SA) was higher after 48 hours of germination in all seed types compared to un-germinated seeds both in darkness and in light. This study shows that sprouted edible seeds are an excellent source of total phenolic compounds and has a high scavenging activity.
اظهر المزيد [+] اقل [-]The influence of technological peculiarities on fermented sausages’ quality and sensory properties
2021
Gramatina, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Sauka, J., Ādažu desu darbnīca, SIA., Ādaži, Ādaži Parish, Ādaži Municipality (Latvia) | Semjonovs, A., Ādažu desu darbnīca, SIA., Ādaži, Ādaži Parish, Ādaži Municipality (Latvia) | Strode, S., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Straumite, E., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia)
Fermentation is one of the ancient technological processes used in food production which influences the shelf-life of meat and meat products, also significantly affects the sensory properties like aroma and flavour. The objective of the present study was to evaluate the elaborated technology for a new fermented sausage production on the product quality and sensory properties. Sausages were produced by the standard technology using glucono-delta-lactone or starter culture. The drying of samples differs from 3 to 4 weeks at the same conditions; samples were dried for 4 weeks which produced with the starter culture, and 3 weeks which produced with glucono-delta-lactone. The sausages were tested at the end of the production, analysing pH, water activity, moisture and salt content, as well as the presence of Listeria monocytogenes, colony forming units of Listeria monocytogenes and Enterobacteriaceae in the sausage samples were analysed. The sensory evaluation was organised after getting Listeria monocytogenes testing results. The moisture content, water activity and salt content significantly differed (p is less than 0.05) among samples, no differences were established in pH, taste and flavour liking. The presence of Listeria monocytogenes was not established in samples which indicates that the producer properly applies a hurdle technology in fermented sausage production. Sensory evaluation results showed higher scores for texture and appearance in fermented sausages with glucono-delta-lactone. The study results confirmed that fermented sausages with glucono-delta-lactone during 3 weeks of drying can achieve corresponding safety criteria and sensory properties which are set for semidry fermented sausages.
اظهر المزيد [+] اقل [-]Impact of crop rotation and soil tillage on the severity of winter wheat leaf blotches
2021
Bankina, B., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Bimsteine, G., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Arhipova, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Kaneps, J., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Darguza, M., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia)
Reduced tillage is considered as one of the main tools to save biological diversity; however, it increases pressure of diseases, including wheat leaf blotches. The aim of present study was to clarify the impact of reduced soil tillage on the development of winter wheat leaf blotches in different schemes of crop rotation. The impact of different growing technologies on the severity of winter wheat disease was evaluated in a two-factorial experiment: A – soil tillage system, and B – different combinations of wheat pre-pre-crop and pre-crop (wheat, oilseed rape, barley and faba beans). Diseases were assessed every 10 days approximately and total impact of diseases was evaluated by calculating AUDPC (Area under Diseases Progress Curve). Tan spot, caused by Pyrenophora tritici-repentis was dominated disease over the long period, regardless of meteorological conditions. Development of Septoria leaf blotch was not influenced by neither crop rotation nor soil tillage. The level of tan spot was essentially higher after wheat, regardless of the pre-pre-crop. Reduced soil tillage promoted severity of tan spot. Ploughing mitigated effect of previous crops and differences in tan spot level were insignificant. Despite many positive effects of conservation tillage, increasing of fungicide treatment could be necessary, in conditions, when the tan spot is most devastating and widespread wheat disease.
اظهر المزيد [+] اقل [-]Impact of high-pressure impregnation and fire protective coatings on the reaction to fire performance of birch plywood
2021
Rudzite, S., Latvijas Finieris, JSC, Riga (Latvia) | Buksans, E., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia)
Birch plywood has a wide range of applications for interior and exterior use. The demand for plywood with improved fire protection properties and good visual appearance is increasing year by year. The impregnation at high pressure of the whole plywood panels is one of the options to achieve it. The aim of this study was to develop good visual looking birch plywood product for interior design purposes as well evaluate different influencing factors to reaction to fire properties of fire-retardant treated birch plywood. This study consists of three parts. At the first stage, high pressure industrially impregnated plywood properties were studied by two influencing factors – distribution of fire retardant in plywood panel plane and sanding process influence on reaction to fire performance of product. At the second stage, seven different industrial finishing systems were selected for covering high-pressure impregnated birch plywood and their effect on fire reaction performance was studied. In addition, two surface coating systems were studied on standard birch plywood substrate. At the third stage, intumescent coating consumption effect on reaction to fire performance was studied. The reaction to fire performance of birch plywood was evaluated by performing a flammability test using the Single Burning Item test according to EN 13823:2010. It was found that high pressure impregnation of plywood cannot ensure even saturation of fire retardant throughout the sheet, which significantly affects the fire performance of product. The impact of different finishing materials to reaction to fire performance has been described by the results of this research.
اظهر المزيد [+] اقل [-]Status of the precision beekeeping development in Latvia
2021
Zacepins, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Kviesis, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Komasilovs, V. | Brusbardis, V., Latvian Beekeeping Association, Jelgava (Latvia) | Kronbergs, J., Latvian Beekeeping Association, Jelgava (Latvia);BeeTech Services, SIA, Riga (Latvia)
Information and communication technologies are part of almost any branch of human lives. During the last decade also beekeeping joined the direction of application of IT tools and solutions and precision beekeeping was defined. Still in the beekeeping many operations and observations are completed manually, and there is a potential to switch to the digital realisation. Information technologies can be used in the beekeeping to partly support the beekeepers by implementation of automatic or semi-automatic solutions for bee colony remote monitoring, apiary record making and other actions. The aim of this paper is to make a summary of the usage of information technology tools by the beekeepers in Latvia, summarizing precision beekeeping development status and conclude about its future development potential. To achieve this aim, in cooperation with Latvian Beekeepers Association, a beekeepers survey was conducted. More than 200 beekeepers shared thoughts and opinions about their application of information and communication technologies for monitoring the bee colonies and apiary management. The summary of the survey conducted is described in this study.
اظهر المزيد [+] اقل [-]Awareness of integrated soil fertility management practices in the Savelugu Municipal of the Northern Region of Ghana
2020
Abukari, A., University for Development Studies, Tamale (Ghana). Faculty of Natural Resources and Environment | Abukari, R., University of Ghana, Legon (Ghana). College of Humanities. Inst. of Statistical, Social and Economic Research
In sub-Saharan Africa intensifying small-scale farming is essential in addressing poverty related issues in rural communities and the degradation of natural resources. Integrated Soil Fertility Management (ISFM) are the best practices used to improve the productivity of crops whilst maximizing agronomic efficiency of inputs applied and hence contributing to sustainable intensification. ISFM usually include the appropriate use of inorganic fertilizer and organic resources, good agronomic practices and appropriate use of germplasm. The survey was carried-out on the awareness of Integrated Soil Fertility Management practices in the Savelugu Municipal of Northern Ghana to study the awareness of integrated soil fertility management practices amongst farmers through the administration of questionnaires. A multistage method of sampling was used in selecting thirty (30) respondents randomly from five (5) selected communities namely Jana, Yapalsi, Diari, Nabogu and Gushie to make up a total sample size of 150 respondents. Frequency distribution and percentages were used to represent the data. Correlation analysis was used to test for the relationship between awareness, educational level and household size. The survey showed that majority of the respondents at ages between 21 and 30 years were married and majority with household size of 3 to 5 as well as primary and secondary education. Farming activities were carried-out by hand (80%). Majority of the respondents (43.3%) were informed about ISFM through demonstrations and 20% of the farmers apply inorganic fertilizer. About 85.5% of the respondents were aware of ISFM. The research also revealed that ISFM improves production and supports finances of respondents. The assessment of respondents’ perception of ISFM revealed a positive agreement of the effect of ISFM on soil health as well as improved production. In conclusion, it is thus suggested that it is needful for the involvement of the government on the adoption of ISFM via Non-Governmental Organisations (NGOs) locally and or internationally for a suitable advancement and to guarantee a sustainable environment with a world-wide corporation for improvement.
اظهر المزيد [+] اقل [-]An AHP [Analytic Hierarchy Process] – based assessment of scenarios for promoting employment of people with disabilities in Latvia
2020
Oborenko, Z., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Economics and Social Development | Rivza, B., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Economics and Social Development | Rivza, P., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Information Technologies
The employment of people with disabilities has multidimensional aspects − economic, social, legal, human rights, discrimination, psychological, ethical and responsibility aspects − with different actors involved representing various kinds of interests. The European Union Disability Action Plan and Strategy specifies the objective of promoting the employment of people with disabilities in the open labour market. The employment of such individuals is not only an economic issue, but also an issue of social inclusion, poverty reduction, equal opportunity and socially responsible employment. Effective and fair use of human resources for national economic development requires a variety of support mechanisms, including regulatory frameworks, the active involvement of local municipalities, and measures taken by state institutions. Because of the different issues and the various actors with different interests involved, an integrated way has to be considered to analyse the employment factors and employment opportunities for people with disabilities. The purpose of this study is to explore and substantiate the possible scenarios associated with promotion employment opportunities for people with disabilities in Latvia. The research methodology employed for this study is based on the Analytic Hierarchy Process, and expert interviews are used to analyse the interests of all involved parties, in order to determine the best possible scenarios as to how to stimulate employment for people with disabilities. As a result, three scenarios to promote the employment of people with disabilities were developed. Although the results showed slight differences between the three scenarios, experts believe that the optimal scenario for promoting the employment of people with disabilities is the one in which the EU participates.
اظهر المزيد [+] اقل [-]Civil engineering inspection for real estate evaluation with the use of artificial learning algorithms and fuzzy logic
2020
Surgelas, V., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Environment and Civil Engineering | Arhipova, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Information Technologies | Pukite, V., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Environment and Civil Engineering
The technical inspection of a building carried out by an expert in civil engineering can identify and classify the physical conditions of the real estate; this generates relevant information for the protection and safety of users. Given the real conditions of the property, and for the real estate valuation universe, using artificial intelligence and fuzzy logic, it is possible to obtain the market price associated with the physical conditions of the building. The objective of this experiment is to develop a property evaluation model using a civil engineering inspection form associated with artificial intelligence, and fuzzy logic, and also compare with market value to verify the applicability of this inspection form. Therefore, the methodology used is based on technical inspection of civil engineering regarding the state of conservation of properties according to the model used in Portugal and adapted to the reality of Latvia. Artificial intelligence is applied after obtaining data from that report. From this, association rules are obtained, which are used in the diffuse logic to obtain the price of the apartment per square meter, and for comparison with the market value. For this purpose, 48 samples of residential apartments located in the city of Jelgava in Latvia are used, with an inspection carried out from October to December 2019. The main result is the 9% error metric, which demonstrates the possibility of applying the method proposed in this experiment. Thus, for each apartment sample consulted, it resulted in the state of conservation and a market value associated.
اظهر المزيد [+] اقل [-]Age structure of farm owners and managers: problems and the solutions thereto in Latvia
2020
Nipers, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Pilvere, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia)
The research paper presents the results of research on the situation and trends in the age structure of farm owners or managers in Latvia. The growing world population and the challenges caused by climate change make farmers reconsider their traditional farming practices. Therefore, scientists believe that the aging of farmers is a major obstacle to the sustainable development of agriculture and rural areas, as evidenced by the age structure of European Union (EU) farmers and other agricultural workers. Generation renewal is crucial for sustainable land management and food production. In 2018, according to statistical data, the share of agriculture, forestry and fisheries in total gross value added in Latvia was only 3.8%. However, these sectors were the main job creators and drivers of economic development in rural areas. Therefore, the aim of the present research is to assess trends in the age structure of farm managers and owners and the policy instruments applied in Latvia. The results of the research show that despite the policy instruments implemented in Latvia after its accession to the EU to support young farmers and promote early retirement of farm owners, the aging process of farm owners and managers occurs relatively fast. The median age of farm owners and managers in Latvia has increased from 53 years in 2009 to 57 years in 2019, which could hinder the development of the agricultural industry and prevent the new challenge of growing global food demand and the negative impacts of climate change from being tackled.
اظهر المزيد [+] اقل [-]Theoretical studies of the vibration process of the dryer for waste of food
2020
Bulgakov, V., National Univ. of Life and Environmental Sciences of Ukraine, Kiev (Ukraine) | Sevostianov, I., Vinnytsia National Agrarian Univ. (Ukraine) | Kaletnik, G., Vinnytsia National Agrarian Univ. (Ukraine) | Babyn, I., Vinnytsia National Agrarian Univ. (Ukraine) | Ivanovs, S., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Holovach, I., National Univ. of Life and Environmental Sciences of Ukraine, Kiev (Ukraine) | Ihnatiev, Ye., Dmytro Motornyi Tavria State Agrotechnological Univ., Melitopol, Zaporizhzhia obl.(Ukraine)
An urgent problem is drying and processing of the wet dispersed waste, obtained in the production of food products, which can then be efficiently used as a fertiliser, for feeding livestock or as biofuel. A new design of a vibrating fluidised bed dryer has been developed, which, with low energy consumption, provides a pre-set productivity and the required final moisture content. The process of vertical oscillations of the body of a vibration dryer, together with the food waste contained in it, is analysed analytically, the necessary equivalent scheme is built, on the basis of which differential equations of the vertical oscillations of the body are compiled, their analytical solutions are obtained, and a numerical calculation is performed on a PC using the developed program.
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