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  • Suryanarayanan, Tilak (2015)
    The objective of the thesis was to investigate the effect of carbohydrates on solubility, emulsifying, gelling and water holding properties of proteins. Faba bean is a readily available pulse crop with high protein content similar to soy bean and there is a lot of potential for a novel, high protein fermented gel product to be made from a pulse crop like faba bean. This is mainly due to its remarkable nutritional properties, functional properties and low cost, the demand for faba bean protein ingredients will grow. The current study was an attempt to develop pulse protein based products – emulsion (milk-like) and emulsion gel (yogurt-like) from faba bean. It seeks to expand the field of application of faba bean protein based products. Faba bean was pretreated, dehulled and milled. The flour was made into suspensions and the starch in faba bean was subjected to amylolytic treatments (addition of alpha amylase and glucoamylase) to breakdown the starch into smaller particles. These treated suspensions were then homogenized to obtain emulsion. A protein based gel network was produced with the gelation of amylolytically treated faba bean proteins. The emulsion properties, specifically droplet size, stability and activity were tested by PAMAS Particle Counter System. Light microscopy was applied to reveal the microstructure of emulsion and emulsion gel. Emulsion gel texture properties were studied by texture analysis. The emulsions were relatively stable over a period of a month and had white ‘milk’ like appearance. The emulsion gels prepared (amylolytic treatment) had slightly higher water holding capacities than the control A (entire starch present) and control B (starch removed by filtration) emulsion gels. Texture analysis of the emulsion gels showed that more force was required by probe to penetrate the yogurt produced from amylolytically treated samples and less force was required to penetrate the yogurt produced from controls A and B. The yield of the emulsion gels were higher for the amylolytically treated samples. It can be concluded that amylolytic treatment has increased the water holding capacity and also resulted in stronger gel systems.
  • Teikari, Jonna (2013)
    Cyanobacteria are phototrophic organisms. They usually occur in water but many species also live in terrestrial habitats, e.g. in symbiotic relationships with fungus. Inorganic phosphorus (Pi) is usually considered to be a limiting factor for the growth of cyanobacteria living in water, since cyanobacteria can use only Pi as a direct source of phosphorus. It has been shown that cyanobacteria have pho-regulon similar to that of Escherichia coli. Pho-regulon can transport and assimilate inorganic phosphate. Cyanobacteria usually produce a wide range of bioactive compounds, which can e.g. be toxic or prevent growth of other bacteria, fungi or yeast. Many of these compounds are produced by non-ribosomal peptide synthetases (NRPS). The aim of this study was to investigate changes in Anabaena sp. 90 proteome, and differences in amounts of bioactive compounds produced by the strain, while growing it in media with high (5,5 mg/l) or low (0,05 mg/ml) Pi concentration. Before moving the culture into two different Pi media, phosphorus storages of the culture were emptied by growing the strain in the media without Pi. In this study, 2D differential gel electrophoresis (2D-DIGE) coupled with LC/MS was used to study proteomes of the organism. Bioactive compounds were also analyzed by LC/MS. Anabaena sp. 90 was chosen because of its fully sequenced and annotated genome. The strain has been found to produce microcystins, anabaenopeptins and anabaenopeptilides. Eleven protein spots with significantly increased or decreased protein quantities were identified in the low Pi media. Ten of them were identified as proteins, which participate in bacterial stringent response. Stringent response is activated when culture is achieving the stationary phase. These stringent response proteins participate in the amino-acid metabolism and translation. One of the proteins was shown to be a ribosomal protein. In addition, the identified proteins included ribulose-bisphosphate carboxylase oxygenase (RuBisCO), which had a significantly lower concentration in the cells in low-phosphorous media. There were no significant differences in amounts of bioactive compounds when growing the culture in low and high Pi media. More replicates could be used, when the study of bioactive compounds is repeated.
  • Partanen, Asta (2013)
    Cyanobacteria are aquatic and terrestrial organisms that have photosynthetic cababilities. Cyanobacteria are classified to five orders according to their morphology. These are Chroococcales, Pleurocapsales, Oscillatoriales, Nostocales and Stigonematales. Anabaena sp. 90 is a filamentous cyanobacterium in the order of Nostocales. A sample of this cyanobacterium was isolated from the lake Vesijärvi in 1986. Anabaena sp. 90 produces a variety of bioactive peptides such as microcystins, anabaenopeptins and anabaenopeptilides which are the most commonly studied of the peptides produced by the strain. Majority of the bioactive peptides are produced by non-ribosomal peptide synthetases (NRPS). The way these compounds affect cyanobacteria is currently unclear. Anabaenopeptilide deficient mutant (apd-) variety has been developed from the Anabaena sp 90 wild type (WT). The mutant is unable to produce anabaenopeptilides. The aim of my Master´s thesis was to study the changes in proteomes of WT and apd- strains by conducting a six day cultivation experiment. The purpose was to evaluate the possible differences in the amount of proteins that the different cultivation stocks were able to produce. The secondary purpose was to examine the transcription of anabaenopeptilide synthetase genes. Proteomic study was performed using a procedure called two dimensional differential gel electrophoresis (2D DIGE). The differences in the proteomes´ statistics were examined by using the Student´s t test. Transcription of anabaenopeptilide synthetase genes were studied using a reverse transcriptase polymerase chain reaction (RT-PCR). The data collected from these studies concluded that there were differences in the proteomes of WT and apd- strains. In eighteen cases there were significant differences in the protein amounts between the strains. The single protein counts were often higher in the apd- than in the WT strain. Anabaenopeptilide synthetase genes were transcribed in both strains which suggests that the mutation in the apd- strain did not hinder the ability of the strain to produce anabaenopeptilide transcripts. The identification of significant proteins would yield more detailed knowledge of the metabolical functions of WT and apd- strains.
  • Seppänen, Vanamo (2010)
    Tässä tutkimuksessa tarkasteltiin viljelykäytössä olevan happaman sulfaattimaan Ap- ja Bg1- horisonttien aggregaattien stabiilisuudessa tapahtuvia muutoksia neljän viikon tulvituksen aikana. Tulvitus estää maan kaasunvaihdon, mikä aiheuttaa hapen puutetta maaperässä. Tästä seuraa muutoksia maan kemiallisissa olosuhteissa, muun muassa maan rakennetta stabiloivan raudan liukoisuus lisääntyy. Tutkimus suoritettiin laboratoriokokeena. Aggregaattien stabiilisuuden mittarina käytettiin märkäseulonnassa irtoavien alle 250 ?m:n kokoisten hiukkasten sekä kolloidiaineksen (< 2 ?m) määrää. Märkäseulonnassa irtoavan maa-aineksen määrää selvitettiin gravimetrisillä mittauksilla sekä laservaloon perustuvilla menetelmillä. Työssä käytetyt laservaloon perustuvat menetelmät olivat dynaaminen valonsironta sekä partikkelilaskenta. Dynaamista valonsirontaa käytettiin kolloidiaineksen määrän mittaamiseen. Menetelmän ongelmana oli tulosten välinen suuri hajonta. Alle 250 ?m:n kokoisten hiukkasten määrää mitattiin partikkelilaskurilla. Tätä mittausta vaikeutti laitteen vaatima pieni partikkelikonsentraatio sekä suurimpien partikkelien jääminen mittauksen ulkopuolelle. Aggregaattien stabiilisuuden tarkastelussa käytettiin gravimetristen mittausten tuloksia. Tulosten perusteella Bg1-horisontin murut olivat huomattavasti Ap-horisontin muruja kestävämpiä. Tähän saattoi olla syynä raudan suurempi määrä Bg1-horisontissa. Ap-horisontin näytteissä sekä makro- että mikroaggregaattien stabiilisuus väheni kokeen aikana. Myös Bg1- horisontin näytteissä mikroaggregaattien kestävyys heikkeni, mutta ei yhtä paljon kuin Aphorisontin näytteissä. Ap-horisontin makroaggregaattien stabiilisuuden heikkenemiseen saattoi olla syynä niitä koossa pitävien juurten mikrobiologinen hajoaminen. Bg1-horisontin mikroaggregaattien hajoaminen oli mahdollisesti seurausta raudan liukenemisesta. Aggregaattien stabiloituminen kokeen loppua kohti aiheutui luultavasti johtokyvyn noususta näytteissä. Syyt stabiilisuusmuutoksiin kaipaavat kuitenkin vielä jatkotutkimuksia.
  • Ahmala, Elina (2024)
    Air pollution has many negative effects, for example on human health. It is important to reduce these effects with different policy measures. However, reduction measures can affect which groups of people suffer from pollution. Market-based methods, such as emission trading, are often cost-effective but raise concerns about environmental justice. When air pollutants are reduced from the cheapest places, there is a risk that pollutants will be unevenly distributed among socioeconomic groups. It is important to study whether such environmental injustice exists in Finland. Finland is an interesting research subject because it differs from other countries where similar studies have been conducted, for example, due to population density and relatively small income differences. In this thesis, it is analysed how air pollutants are distributed in Finland based on socioeconomic factors and whether the levels of air pollutants have developed evenly among different income groups during the 2010s. The air pollutants that are in the scope of this thesis are carbon monoxide, sulfur dioxide, and nitrogen dioxide. The air pollution data is produced by NASA and is mainly collected by satellites. The socioeconomic factors that are used in the study include household income, low-income households, households with children, one-parent households with children, and highly educated individuals. Socioeconomic data is obtained from Statistics Finland's Paavo database. To analyse the data, bivariate and multivariate ordinary least squares regressions are done for the variables. The main finding of this thesis is that air quality is somewhat unevenly distributed among different income groups in Finland. High-income households are more exposed to pollution than low-income households. High-income households are more exposed to pollution because there are higher pollution levels in urban areas where households have higher incomes. Additionally, highly educated individuals and one-parent households are exposed to more pollution than others. Air quality has developed differently for different pollutants during the 2010s. Not all air pollution concentrations have decreased in the 2010s. Air quality has improved, especially for carbon monoxide among low-income households, and for sulfur dioxide and nitrogen dioxide among high-income and highly educated individuals. This study contributes to the research on the distribution of air pollutants and can help the development of more effective air pollution policies.
  • Jaana, Haavisto (2023)
    Policy makers must make decisions regarding budget allocation between policies and research. Only actions improve the state of the system, but knowledge increases the probability of effective action. The outcome of environmental policies is usually uncertain, and the question remains: should we invest more in research or use resources for additional policies? Under uncertain decision making, it is clear, that doing and knowing go hand in hand. Still, there is a lack of scientific analyses about the relationship between these features. This paper analyses how uncertainty in policy implementation outcome (i.e., Value- of- control, VoC) effects the need for additional knowledge, which is measured using value- of- information (VoI) analysis. Additionally, the paper analyses how the obtained results can help in the allocation of resources between policy and research. To answer these questions, I use a published Bayesian decision model by Helle et al. (2015) as a source for further analysis. It is an influence diagram model, consisting of two decision variables, 40 random variables and 13 utility variables which are described in euros, allowing the monetary summarisation of utility. I introduce levels of implementation uncertainty to the other decision by placing an additional random variable to influence the successor variables of the decision. I define the levels of uncertainty using two co-variation methods, first one being the proportional co-variation method, and the second one the order- preserving uniform method. By this way, I analyse and compare the effect of distinct levels of decreased controllability (VoC) to VoI analysis results. These two methods describe two alternative ways of modelling the uncertainty in implementation, which is always uncertain when we consider future actions that have yet to been implemented. I conduct the analysis separately for both co-variation approaches, and 10 alternative levels of implementation uncertainty, to enable systematic comparability between the chosen methods, and to learn alternative ways to consider the relationship of controllability and knowledge. First, I preform the VoI analysis only for the policy that is subjected to implementation uncertainty. Secondly, the analysis is done for both decision variables and the Single Policy Updating (SPU) algorithm of Hugin software is used for detecting optimal policies for different implementation uncertainty levels. In other words, I show how the various levels of controllability of the system impact the needs to carry out research. I argue, that this is a fundamental question for many environmental policy questions, such as climate change, eutrophication, loss of biodiversity and in my example, risks of oil spills. The results show a consistent, but interesting effect of decreased controllability to the VoI analysis results. Increase in implementation uncertainty raises the overall VoI and increases the number of variables presented with VoI, i.e., once the estimated uncertainty of controllability increases, the chance to achieve desired results increases only by knowing more. When only one decision variable is included, VoI increases to the point of no control, indicating that VoI is zero when controllability of the system is zero, indicating that there is no point of carrying out research, if the knowledge cannot be used to improve the effects of actions. When both decision variables are included in this case, VoI increases to a certain point and decreases after that. This study highlights the need for such analyses in decision problems, where uncertainty in policy implementation is often overlooked. This is the case with most deterministic, point estimate models. I argue, that this type of analysis would lead to more effective solving of environmental problems.
  • Stolze, Markus (2019)
    The purpose of this master’s thesis is to evaluate the reliability of forest products forecast information produced by United Nations Economic Commission for Europe member States. The study also aims to answer which dimensions of data quality are the most important when producing these predictions This study is carried out as quantitative research and it focuses on the predictions made by the 27 member States, produced between 2002 and 2017. This research aims to find out what methods are used by different member States and which methods produce the most reliable results. This research also aims to find out if there are any differences in reliability when assessing different product flows (removals, production, exports or imports) of the various products analyzed. There were clear differences visible between different products in the results of this research. In some products, almost all member States had managed to produce reliable predictions, while for others majority of member States didn’t manage that. There were also differences between member States and some were clearly more reliable than others. The biggest factor affecting reliability was volume: for most parts, bigger volumes meant more reliable predictions. Production and removals were more reliable product flow than imports or exports. This is due to the nature of imports and exports, as they are more easily affected by outside impacts. Although all member States were able to be sorted into four groups based on how different product flows looked like, no clear patterns were visible when observing how different member States produce predictions. Almost all of the interviewed representatives of member States reported that they were using almost or exactly the same methods to produce predictions.
  • Li, Yanru (2022)
    Phage lysins are enzymes that degrade bacterial cell wall. A wild-type Lactococcus lactis strain LAC460 secretes three phage lysins, LysL, LysP, and LysT, encoded by three different prophages. Unlike common phage lysins, these enzymes do not break down the host's cell wall. Therefore, these lysins can attack other L. lactis strains and behave like bacteriocins, antimicrobial proteins. The binding of a phage lysin to bacterial cell wall requires a specific cell wall binding domain (CBD) in the lysin. However, nothing about the CBDs of LysL, LysP and LysT is known. This study aimed to determine the CBDs of these three lysins and the target specificity of the lysins. Putative CBD regions of the lysins were fused with green fluorescent protein (GFPuv). GFPuv-CBD-LysL and GFPuv-CBD-LysT were ligated into the pASG-IBA4 vector and cloned in Escherichia coli DH5α. After all, only the construction of the GFPuv-CBD- LysL was successful resulting in fluorescent transformants. To analyse the binding of GFPuv- CBD-LysL to cells of different L. lactis strains, the fusion proteins were mixed with the LysL sensitive L. lactis MG1614, LysL resistant L. lactis LM0230, and the LysL producing LAC460 cells. With fluorescence microscope it could be seen that the GFPuv-CBD-LysL decorated the cell surface of L. lactis MG1614 with green fluorescence, but LM0230 and LAC460 cells remained non-fluorescent. The fluorescence of the cells was also measured with a fluorometer, showing strong fluorescence from MG1614, but nothing from the other two strains. This showed that the fusion protein specifically bound to the MG1614 cell surface, but it did not bind to the LysL resistant strain LM0230 or the LysL producer LAC460 cell. In conclusion, the results demonstrate that the C-terminus of LysL contains a specific cell wall binding domain. In addition, the results provide an explanation for how LAC460 can secrete LysL without autolysis, as phage lysins not able to bind onto peptidoglycan are unable to lyse cells.
  • Wan, Minli (2009)
    China's primary wood processing industry and wood consuming sectors have experienced rapid growth in recent years. Industries like sawnwood and plywood have developed very quickly. The purpose of this study is to: 1) provide an overview of the demand, supply, imports and exports of raw wood and primary wood products in the China market between 1993 and 2007, 2) present quantitative estimates of the relative importance of factors influencing the demand, supply and exports of Chinese plywood, 3) draw conclusions about China's potentials and challenges for foreign enterprises, including Finnish companies. The information, analyses and findings presented in this study can give a reference for wood processing companies, especially for sawnwood and plywood firms, and governmental agencies in China. In addition, the study provides a basis for further study and research. Even though much information has been published in China, academic research in the Chinese woodworking market is scarce, and especially, time-series data is missing and unreliable. This study tries to fill this gap. It is based on secondary data collected from various sources, including literatures, journals, magazines, consulting reports, industry analysis, news, and so on. The annual time-series data obtained for variables in models are mainly gathered from original official Chinese sources. The study increases the information and understanding on the Chinese wood products markets by using descriptive and explanatory methods to analyze the data for background information, markets and empirical modeling. By employing econometric models, based on the elasticity estimates, Chinese plywood demand seems to be income elastic but price inelastic, Chinese plywood supply would be highly elastic with raw material price but scale inelastic, and Chinese plywood exports appear to be highly income elastic.
  • Xu, Yuan (2013)
    The increasing recognition of eco-friendly packaging in the packaging industry makes paperboard one of the most promising green packaging materials. The global demand for paperboard has increased rapidly in the past two decades. The purposes of the study are: firstly, to provide an overview of the consumption, production, imports and exports of paperboard products in different regions worldwide between 1992 and 2010. Secondly, as the Finnish paperboard industry has been highly export-oriented, the study also aims to provide quantitative analysis of the main determinants influencing the demand for Finnish paperboard exports in its main destinations-Germany and Russia by applying economic models from the first quarter of 1995 to the third quarter of 2011. Finally, trends projection for the future development of Finnish paperboard is presented based on results of analysis. The research is both descriptive and explanatory based on secondary data collected from various databases. The regional analysis of paperboard market from 1992 to 2010 revealed that North America and Western Europe’s paperboard production exceeded the consumption, where Asia, Eastern Europe and Latin America’s consumption exceeded the production. The consumption and production growth was extremely fast in Asia and it has been the largest consumer and producer of paperboard products since 2000s. Western Europe has been the largest exporter and importer throughout the years. The empirical modeling of Finnish paperboard export demand showed that the export demand for Finnish paperboard in Germany was highly affected by the total paperboard imports of Germany and its GDP. It also has high sensitivity to the income changes of Germany in long term, but the price effect was not significant. The export demand for Finnish paperboard in Russia has low income elasticity and the price effect was statistically significant. Oil price has also significant influence on Finnish paperboard export demand to Russia. According to the linear trends projection for Finnish paperboard market to 2020, the consumption and imports will grow very slowly or even stagnate, but the production and exports will continuously increase at a faster pace.
  • Quiñónez Montiel, Juan Pablo (2016)
    India is a fast growing economy with a high rate of gross domestic product that has improved the local spending power and has turned the country into a potential player in the global economy. In terms of wood products, India has been a net importer and currently is one the largest consumers of hardwood sawnwood in the world. The demand for sawnwood is rapidly growing in India and due to this situation, the country is a potential destination for Finnish and foreign exporters able to reach this market. The research attempted to increase the understanding of the importance of the demand for sawnwood in India. Thus, the purposes of this study are to: 1) provide a general description about the market environment of sawnwood in India and its situation at global level; 2) model and estimate potential factors impacting the demand level for Indian imports of sawnwood; 3) draw general conclusions about key opportunities and challenges for Finnish and major foreign exporters of sawnwood in the Indian market. Despite there is valuable information published about India’s wood market, empirical research on the Indian sawnwood market is scarce and unreliable. Hence, based on descriptive and explanatory methods, this study gathered secondary data from official and international sources for background and statistical information. The purpose was to analyze the sawnwood market through empirical modelling. Thus, econometric time-series modeling, for the period of 1992-2013, was used to explain the demand for imports of sawnwood in the Indian market by testing the conventional demand model, for income and price variables, and ad hoc models, for several explanatory variables. In addition, Engle and Granger, MacKinnon and Johansen methods were used to test cointegration among variables. The results suggest that the demand for imports of sawnwood is positively related to consumer income and negatively to prices. In addition, it depends on other factors such as population density, unemployment and economic openness. However, based on the elasticity estimates, the Indian sawnwood demand seems to be income and price elastic. The knowledge obtained in this study provides a valuable tool for foreign wood-based industries searching for market prospects to export their products as well as for public authorities involved in formulating forest and economic policies. However, further modelling is left for future research in this area.
  • Tran, Cuong (2018)
    Salicylic acid (SA) is a well-known phytohormone involved in pathogen defense, development and controlling the cellular redox balance. In response to stresses, Arabidopsis thaliana synthesizes SA in the chloroplasts mainly via the isochorismate (IC) pathway: IC synthase (ICS) uses chorismate to produce IC, which is in turn converted to SA. ICS1 is the rate limiting enzyme in SA biosynthesis. The ICS1 protein localizes in the chloroplasts and contains a chloroplast transit peptide sequence, which is the first 45 amino acids in the N-terminus. Under different light conditions, plants employ different stress defense strategies. In a previous study, wild type (WT) Arabidopsis thaliana ecotype Columbia-0 grown under different light conditions [short day (SD; 8h light/16h dark), long day (LD; 16h light/8h dark) and 12h light/12h dark] was exposed to ozone for 1 hour (350 ppb). In a phosphoproteomic approach to study signaling mechanisms, ICS1 has been found as an in vivo phosphoprotein in ozone-treated plants grown under SD condition by mass spectrometry (MS). To analyze the phosphorylation of ICS1 in vitro, WT and phospho-negative ICS1 proteins were produced recombinantly as GST-fusion proteins in E. coli and used as the substrates for targeted kinase assays. Phospho-negative ICS1 protein was generated by mutating the phospho-sites to alanines by site-directed mutagenesis. ICS1 could be phosphorylated either in the cytosol or in the chloroplasts. Therefore, different cytosolic kinases, which are involved in various stress signaling events, and a chloroplast protein kinase that functions as a dominant regulator of chloroplast processes, were selected as the kinases to be tested. In this study, GST-ICS1 could be successfully phosphorylated in vitro. To a similar extent, GST-phospho-negative ICS1 was phosphorylated, indicating that ICS1 was phosphorylated in vitro at sites that were different from the ones found by MS from plant material. In order to study the identified phospho-sites in vivo, transgenic Arabidopsis carrying WT, phospho-positive, and phospho-negative ICS1 proteins were generated. Transgenic plants were confirmed by genotyping. Western blotting was carried out to evaluate ECFP-WT ICS1 protein expression. However, none of the transgenic plants could be confirmed to carry ECFP-WT ICS1. Additionally, an antibody against AtICS1 produced by the company Agrisera was tested for its specificity against the endogenous ICS1 protein. While the antibody could detect recombinant GST-ICS1 protein, ICS1 could not be detected from a total protein extract.
  • Eusuf, Saad Bin (2020)
    Stress response in plants is influenced by several external and internal factors and is executed in a modular way. Environmental stimuli or stress is sensed by cellular receptors and the signal is transduced inside cell via the phospho-activation of highly conserved intracellular signaling cascades like mitogen activated protein kinase (MAPK) cascades. The signal then activates biosynthesis pathways of major stress response hormones like Salicylic acid (SA). In Arabidopsis about 90% SA is synthesized via isochorismate pathway and Isochorismate synthase 1 (ICS1) is a rate limiting enzyme in this pathway. In this study, goal was to select transgenic ICS1 (homozygous) candidate lines from parent ICS1-CFP by selective regeneration. Then, by molecular and physiological characterization of transgenic ICS1-CFP plants, the function of ICS1 phosphorylation, more specifically, impact of different photoperiods (Long day; LD and Short day; SD) and stress conditions on ICS1 activity would have resolved. However, there were no homozygous candidate line from any parent ICS1-CFP plants after several screening. Nevertheless, ozone treated stress sensitivity test was performed with heterozygous ICS1-CFP candidate plants (T2 generation). Ozone treated stress depends on stomata factor because ozone enters into plants through stomata. Therefore, stomata index analysis was performed with sid2 and WT (Col-0) phenotypes and grown in LD and SD conditions. Since, stomata number was different between LD and SD plants of both sid2 and WT phenotypes, a different method named Xanthine-Xanthine oxidase (X/XO) treatment was applied that induce oxidative stress regardless of stomata. Although, WT and sid2 had shown sensitivity to the treatment, the overall cell death percentage was very low. Lastly, our aim was to observe the impact of different photoperiods on the activation of two particular MAPKs i.e MPK3 and MPK6 under stress conditions. The phosphorylated (P-MPK3 and P-MPK6) are found abundantly in ozone treated plants as an early response. In this experiment, plants were grown in both LD and SD, stressed with both ozone and X/XO treatments, the activation of P-MPK3 and P-MPK6 was observed by protein level analysis (western blotting) in detailed time course. Although, the activation was visualized in both LD and SD plants, qualitatively the pattern was similar between day type samples and activation signal was very weak in both stress methods. In addition, anti-ICS1 antibody provided by Agrsera TM was tested for its efficiency to detect endogenous ICS1 protein in plants in two experimental set-up. Although the antibody could detect overexpressed ICS1-CFP protein in samples, it was not that efficient to detect endogenous ICS1 in any of the experiments.
  • Kamlang-ek, Pimwalee (2012)
    The literature survey reviewed principles of oxidation of edible oils, adverse effects of lipid oxidation and analysis of volatile oxidation products by SPME-GC-MS. The main aim of the experimental research was to study the influence of relative humidity (RH) on the release of volatile oxidation products from spray-dried emulsions with natural and cross-linked casein as emulsifier. The release of volatiles was determined by SPME-GC-MS. The sub aims were to study the effects of stabilization time at specific RHs, of temperature and agitation speed during the SPME extraction. The spray-dried emulsions were oxidised at 40oC in order to reach a certain level of oxidation. Next, the powders were stabilised under five RHs (0%, 11%, 33%, 54% and 75%) for one or two weeks in order to observe the effect of the RH and the stabilisation time on the release of volatiles. After adjusting the RHs, volatile compounds were analysed by SPME-GC-MS. The following SPME extraction conditions were tested: C1: temperature 40oC, agitation speed 250 rpm, C2: 50oC, 250 rpm, C3: 40oC, 500 rpm and C4: 50oC, 500 rpm. Identification of the compounds was carried out by matching their MS spectra with the NIST database. Altogether 45 volatiles released from the powders could be identified, and 18 of them were found in most samples. RH had an important effect on the release of volatiles from the encapsulated samples. The highest release was always observed at 11% and 33% RH, whereas the lowest release was found at 0% and/or 75% RH, depending on the SPME extraction conditions. The stabilisation time did not have a significant effect on the release of volatiles in most RHs. During the SPME extraction step, elevation of the temperature from 40oC to 50oC, as well as the agitation speed from 250 rpm to 500 rpm, facilitated higher release. However, the effect of temperature was greater than that of agitation speed. Although it was suspected that cross-linking of sodium-caseinate would enhance retention of volatiles, our experiment showed greater peak areas of most volatiles from the cross-linked samples than from the natural ones. By controlling the SPME parameters, it was possible to obtain repeatable volatile compound results. The SPME-GC-MS method applied in this study can be reliably used to analyse volatile oxidation products from spray-dried emulsions. Only at very low or high RH the release of volatiles may differ from samples stored at 11% -54% RH.
  • Yassami, Shiva (2022)
    Saccharomyces boulardii is a probiotic yeast related to Saccharomyces cerevisiae but with distinct genetic, taxonomic, and metabolic properties. S. cerevisiae has been used extensively in biotechnological applications. Currently, many strains are available, and multiple genetic tools have been developed, which allow the expression of several exogenous proteins of interest with applications in the fields of medicine, biofuels, the food industry, and scientific research, among others. Although S. boulardii has been widely studied due to its probiotic properties against several gastrointestinal tract disorders, very few studies addressed the use of this yeast as a vector for expression of foreign genes of interest with biotechnological applications. I studied the previously constructed S. boulardii SAC12, which secretes the anti-listerial bacteriocin leucocin C originating from Leuconostoc carnosum 4010. The objective was to study if the bacteriocin leucocin C producing S. boulardii could produce leucocin C in beer fermentation and if leucocin C containing beer can be used as marinade to control Listeria monocytogenes in raw chicken breast strips. The results showed that SAC12 has good ability to secrete LecC, and thus it was used to brew anti-listerial beer. According to results, beer could maintain its anti-listerial activity for 38 days. The anti-listerial effect of the beer stored for different times was analyzed through marinating chicken breast strips (spiked with L. monocytogenes) with the beer for overnight. Results indicated a positive impact of anti-listerial beer in reduction of the viable cells of L. monocytogenes by about 1.6 log from (2.2 ± 0.6) × 10⁷ CFU/g (beer from day 24), and 2.2 log from (1.8 ± 0.3) × 10⁵ CFU/g (beer from day 38). To sum up, the S. boulardii SAC12 efficiently secreted the bacteriocin leucocin C. Brewing beer with S. boulardii SAC12 resulted in beer containing leucocin C. Such beer showed anti-listerial effect when used as marinade for chicken breast strips.
  • Haajanen, Hanna (2020)
    3-Chloro-1,2-propanediol (3-MCPD), 2-chloro-1,3-propanediol (2-MCPD) and 2,3-epoxy-1-propanol (glycidol) and their fatty acid esters are contaminants formed during processing fat containing foodstuffs at high temperatures. Mainly MCPD and glycidyl esters have been found to be formed in the deodorization process of oils, and in vegetable oils, such as palm oil, they have been measured at high concentrations. In accordance with the restrictions imposed by the European Commission, the levels of glycidyl esters must be especially monitored, as they have been identified as potentially carcinogenic compounds. The aim of the study was to introduce and validate a gas chromatographic analysis method for glycidyl esters and MCPD esters for the Customs Laboratory. The method was validated for two matrices: first for oils and then for powdered infant formulas. In addition, the success of the validation was examined by analyzing various oil samples previously received by the Customs Laboratory. The Customs Laboratory is also involved in the activities of the European Union Reference Laboratory, for which it was intended to participate in the reference measurement organized by the EU Reference Laboratory. The method for the determination of 3-MCPD, 2-MCPD and glycidyl esters in oils and infant formulas was carried out according to the guidelines of the European Union Reference Laboratory for Contaminants (EURL-PC). Determination of MCPD and glycidyl ester concentrations in oils and infant formulas included the following steps: fat extraction by liquid-liquid extraction (for infant formulas), addition of standards, solid-phase extraction, conversion of glycidyl esters to 3-MBPD esters, transesterification, neutralization, salting out, derivatization and analysis with gas chromatography-mass spectrometry system. Concentrations were determined using internal standard method. The method was validated for the following parameters: specificity, selectivity, limit of detection and quantitation, reproducibility, repeatability, trueness, linearity and working range, stability and measurement uncertainty. The analytical method developed for the determination of MCPD and glycidyl esters was successfully validated for oils and powdered infant formulas. The developed method proved to be specific and selective. The limit of determination was found to be 6.3 µg/kg, 1.3 µg/kg and 0.8 µg/kg for the oil matrix 3-MCPD, 2-MCPD and glycidyl esters. The limits of determination for the infant formula were 5.4 µg/kg, 3.0 µg/kg and 1.6 µg/kg for 3-MCPD, 2-MCPD and glycidyl esters. Recoveries for MCPD and glycidyl esters in the oil and powdered infant formulas were 83-105%. R2 for calibration lines were greater than 0.99, and the lines were linear over the entire measurement range of 2-1000 µg/kg. The relative standard deviation of repeatability and reproducibility was less than 20% for both matrices. The expanded measurement uncertainty for the MCPD and glycidyl esters of the oil and powdered infant formula was less than 50%. For all parameters, the requirements set by the Customs Laboratory and the performance requirements of Regulation (EU) 1881/2006 were met. A method validated for two matrices can then be accredited. The customs laboratory may use the developed method in the future to control 3-MCPD, 2-MCPD and glycidyl esters levels of oils and powdered infant formulas. In the future, the method could also be validated for new matrices, such as liquid infant formulas.
  • Mouhou, Nabil (2022)
    The aim of this study is to analyze partner insights in a B2B growth model and come up with ways to implement these insights in the case company’s growth plans. This thesis is carried out through a case study at a company labelled as a high-growth start-up. Moreover, the author will aim to utilize these insights to improve the company’s customer segmenting, buyer personas and come up with the best approaches to sell the company’s product to potential customers. This qualitative research is carried out in the form of a case study at a high-tech scaleup. Interviews were conducted with different personnel in the HORECA and food industry. The data for the interviews was obtained through open-ended and conversational communication. Furthermore, supplementary data was collected from the case company’s CRM (customer relationship management) tool. The results provide interesting insights on the potential of using customer insight to improve a company’s customer segmenting and its buyer personas. The theory gathered during the thesis eased the process of improving the case company’s B2B buyer personas and provided meaningful insight in terms of the importance of conducting research about customers to understand how their business activities and operating industry work, as an essential requirement to create joint value between companies.
  • Tang, Tiantian (2009)
    The objective of this thesis is to assess the recreational value (access value) provided by Yuelu Mountain Park in China applying travel cost method (TCM) which is commonly used to estimate non-market benefits. Also, a fee that would maximize the entrance fee income is tentatively calculated. The potential trips to be lost next year are estimated based on local respondents visiting intentions among different age groups. The travel cost demand function is estimated by using basic count data travel cost model-Poisson regression, and survey data collected on-site. Average access values per trip were estimated to be € 0.75 for local and € 64.52 for non-local individuals producing aggregate annual access value of € 20.43 million. Based on the travel cost demand function, an entrance fee of € 5.43 would maximize the revenue collected from the visitors. This would mean more than doubling of the present entrance fee. The result could potentially be utilized when deciding on the entrance fees. It is also suggested that the park management could further study visitors' intentions and reasons either to visit or not to visit the park in the future. Estimated consumer surpluses as well as suggested entrance fee must however, be considered with caution because truncation of the on-site survey data is not accounted for in the Poisson model estimations of this study.
  • Pesu, Linda (2024)
    The LULUCF (land use, land use change, and forestry) sector has been a net emission source for the past few years, which underscores the pressing need for effective measures to mitigate emissions and combat deforestation. Among these measures, the introduction of a land use change fee stands out as a promising policy instrument. The land use change fee, by the polluter pays principle, would impose a cost on deforestation activities, thereby internalising the negative externalities associated with land use changes. The prior studies of the land use change fee have focused on the climate effects, acceptability and legal feasibility of the fee and concentrated more on deforestation due to agriculture. Furthermore, prior studies consistently highlight significant uncertainty surrounding the implications and estimates of the land use change fee. Consequently, there exists a significant gap in the literature regarding the assessment of deforestation arising from construction activities. Thus, this thesis aims to address this gap by conducting an empirical market analysis of the unbuilt and built single-family lot transactions in the presence of a land use change fee. Additionally, the thesis compares two options for designing the land use change fee: hectare-based and emission-based fees. Different levels of these fees are analysed to understand their effects on deforestation, emissions reduction, and economic consequences. The thesis relies on three primary datasets for its data analyses: CORINE land cover change 2006-2012 and 2012-2018, Forest use declarations (FUDs) 2004-2018, and the Purchase Price Registry 2000-2020. Initially, the Corine land cover change and Forest use declarations were integrated using QGIS to determine the land use changes from forestland to other land use categories across Finland, incorporated with the analysis of local detailed plan areas. Subsequently, the market analysis was conducted by integrating the Purchase Price Registry, with a specific focus on transactions intersecting with both FUDs and the combined FUD+Corine dataset. The combined data from the Purchase Price Registry were utilised for conducting the market-level analysis, differences-in-differences analysis, and lastly, an analysis on the land use change fees, all performed using Stata. The results imply that the implementation of a land use change fee demonstrates a notable decrease in deforestation, and a proportional relationship is observed wherein a larger fee level corresponds to a higher reduction in deforestation. Moreover, emissions exhibit a corresponding decline with the introduction of the land use change fee as deforestation decreases. To effectively address the negative climate impact of deforestation, it is recommended that the fee level align with the climate harm. A uniform fee across Finland may lead to regional disparities in construction, as the fee would incentivise abandoning construction in areas where land prices are low. The emission-based fee system would effectively guide reductions in emissions where it is most cost-effective, but administrative costs may become prohibitively high. The proposed land use change fee of 5,000 euros per hectare results in an 8.5 % decrease in deforestation, as indicated by the market analysis, considering all zoning areas and lot sizes. This reduction is significantly lower than the estimate provided by the Ministry of Agriculture and Forestry, which projected a 20 % decrease, excluding local detailed plan areas and areas smaller than 0.5 hectares. Furthermore, the exclusion of local detailed plan areas and areas smaller than 0.5 hectares from the scope of the fee is discouraged based on the results, as this omission would negatively impact urban forests and biodiversity, as it would encourage deforestation activities in these areas. Further research could for instance focus on considering soil emissions and future carbon sequestration, focus on the construction of renewable energy sites and study the deforestation due to construction and agriculture simultaneously.
  • Rusanen, Katri (2019)
    This study aimed at discovering whether using a Virtual Reality (VR) educational platform can result in better learning outcomes compared to a more traditional form of instructional technology, video. In addition, this study aimed at providing information of VR’s ability to transmit credibility, and especially to transmit trustworthiness, competence, and sense of goodwill. Several studies regarding the use of VR and more traditional technologies in education provided the theoretical foundation for this thesis. Additionally, credibility and affordance related theories were involved in the theoretical background. This experimental study was executed as a quantitative study that employed randomized, controlled crossover experiments within test subjects. Three forestry related contents (1) Harvester head, (2) Tree cell, and (3) Laser scanning point clouds, were exposed to test subjects and questionnaires were used to gather information of the experiment and to measure i.a. credibility, affordances and other variables. Pre- and post-test were used to measure learning. The data consisted of N=100 test subjects of which 49 experienced video treatment and 51 experienced VR treatment. Learning results were not better in VR treatments. Conversely, learning results were significantly better in video treatments. There was a significant difference in learning results between the Harvester head content and the other two contents. In Harvester head content test subjects gained significantly better learning results in VR and video conditions. Credibility of the experts was perceived equally high in both VR and video treatments. However, Competence and Goodwill were perceived higher in VR treatments. The expert in the Harvester head content was perceived least competent in both treatments. Finally, the results indicated the chosen affordances (Opportunities, Multi-sensory, Three-dimensionality, and Commitment and Motivation) were significantly more suitable to VR treatments than video. In the light of the obtained results, adapting a VR technology to educational or training purposes should be done with a careful consideration. VR enables visualization in an immersive way that increases motivation and engagement towards the content taught. However, compelling visuals nor the novel media alone do not necessarily result in better learning results. Focusing on presenting specific contents and tasks in VR will enhance its use for educational and training purposes. In the future studies, attention should be paid to avatar credibility and VR’s ability to transmit sense of Competence and Good-will better than traditional media. Additionally, based on the results of this study, the interactive functions of VR ought to be emphasized when focusing on promoting learning.