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106 produkter
106 produkter
Inbunden, Engelska, 2021
1 741 kr
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Bengaluru is one of the fastest growing megacities in India. As such, it provides an in-situ laboratory for studying rural-urban transitions. While urbanization is most evident in the changing landscape with increasing built-up areas, it comes along with changes in ecosystem functions, new economic opportunities, changes in social organization and individual attitudes and behavior. All of these processes are interlinked and mutually depend on each other. This book attempts to integrate studies from a wide scope of disciplinary perspectives and at different spatial scales under the framework of complex social-ecological systems.Agriculture is the prime example of a system in which humans interact with their biophysical environment, and the production systems in the rural-urban interface are profoundly affected by urbanisation. Intensification and diversification of agriculture are immediate responses to urban pressures and demands, and are linked as much to resource (over-)use as to commercialisation. Yet, little is known about the spatial patterns of agricultural transformation in areas of urban sprawl.The focus of the contributions here is explicitly on the interface, in-between the rural and urban systems. It thus differs from the urban-centered perspective of city planners as well as from the rural predominance in most of the agricultural research. In the present volume this focus is implemented by analysing samples along a spatial gradient representing different stages of urbanization. Ongoing time series analyses and a panel study will complement the spatial approach by a temporal dimension.
E-bok
Engelska, 20212 145 kr
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Bengaluru is one of the fastest growing megacities in India. As such, it provides an in-situ laboratory for studying rural-urban transitions. While urbanization is most evident in the changing landscape with increasing built-up areas, it comes along with changes in ecosystem functions, new economic opportunities, changes in social organization and individual attitudes and behavior. All of these processes are interlinked and mutually depend on each other. This book attempts to integrate studies from a wide scope of disciplinary perspectives and at different spatial scales under the framework of complex social-ecological systems.Agriculture is the prime example of a system in which humans interact with their biophysical environment, and the production systems in the rural-urban interface are profoundly affected by urbanisation. Intensification and diversification of agriculture are immediate responses to urban pressures and demands, and are linked as much to resource (over-)use as to commercialisation. Yet, little is known about the spatial patterns of agricultural transformation in areas of urban sprawl.The focus of the contributions here is explicitly on the interface, in-between the rural and urban systems. It thus differs from the urban-centered perspective of city planners as well as from the rural predominance in most of the agricultural research. In the present volume this focus is implemented by analysing samples along a spatial gradient representing different stages of urbanization. Ongoing time series analyses and a panel study will complement the spatial approach by a temporal dimension.
Häftad, Engelska, 2022
1 741 kr
Skickas inom 10-15 vardagar
Bengaluru is one of the fastest growing megacities in India. As such, it provides an in-situ laboratory for studying rural-urban transitions. While urbanization is most evident in the changing landscape with increasing built-up areas, it comes along with changes in ecosystem functions, new economic opportunities, changes in social organization and individual attitudes and behavior. All of these processes are interlinked and mutually depend on each other. This book attempts to integrate studies from a wide scope of disciplinary perspectives and at different spatial scales under the framework of complex social-ecological systems.Agriculture is the prime example of a system in which humans interact with their biophysical environment, and the production systems in the rural-urban interface are profoundly affected by urbanisation. Intensification and diversification of agriculture are immediate responses to urban pressures and demands, and are linked as much to resource (over-)use as to commercialisation. Yet, little is known about the spatial patterns of agricultural transformation in areas of urban sprawl.The focus of the contributions here is explicitly on the interface, in-between the rural and urban systems. It thus differs from the urban-centered perspective of city planners as well as from the rural predominance in most of the agricultural research. In the present volume this focus is implemented by analysing samples along a spatial gradient representing different stages of urbanization. Ongoing time series analyses and a panel study will complement the spatial approach by a temporal dimension.
E-bok
PDF, Engelska, 2016212 kr
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Scientific Study from the year 2016 in the subject Biology - Miscellaneous, , language: English, abstract: Stingless bees are highly social insects which populated the tropical earth 65 million years ago and have been around much longer than honey bees. They are limited to the tropics and subtropics, lack a venom apparatus and cannot sting. Impacts of anthropogenic influences on honey bees have already been reported. Recent studies also showed that the nesting behaviour of Trigona iridipennis Smith in its natural habitat also varies due to interaction, pheromones and environmental stimulus. Little is reported so far about the various natural and domesticated nesting of the Trigona iridipennis Smith in Kerala. Based on thise background, our objectives of this study were to 1) to characterize the Meliponiculture 2) to identify the various natural habitats and domestication materials for nest construction and different types of nests used across Kerala. Various beekeeping methods preferred by farmers across Kerala for the cultivation of Trigona iridipennis Smith. Each nest has its own advantage and disadvantage. During the survey, the most preferred ones were wooden box. Even then according to the easy availability and production cost different nests like earthen pot, bamboo nodes, coconut shell, PVC pipes etc were used. The most preferred natural nesting sites by Trigona iridipennis Smith were mud/stone walls in our study. Being a social insect, Trigona iridipennis Smith shows great diversity in nesting pattern in natural habitats as well as anthropogenic habitats. The shift towards anthropogenic habitats than natural ones may be due to destruction of natural habitats as well as the availability of manmade habitats.
Häftad, Engelska, 2017
353 kr
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E-bok
PDF, Engelska, 2016251 kr
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Scientific Study from the year 2014 in the subject Biology - Zoology, , language: English, abstract: Stingless bees are highly social insects which populated the tropical earth 65 million years ago longer than honey bees. They are limited to tropics and subtropics lacking venom apparatus and cannot sting. Impacts of anthropogenic influences on honey bees were already reported. Based on these back ground, the objectives of this study were to 1) to characterize the swarming and drone movements of Trigona iridipennis Smith in Kerala 2) to identify the foraging behaviour, colour preference and various plants associated with Trigona iridipennis Smith for nest construction as well as dietary sources. Feral as well as hived colonies of stingless bees were located and fixed at different parts of Kerala for observations on their foraging activity. Bee traffic was also measured during various timings across a bright sunny day in November 2013 and between colonies. Bee traffic among Trigona iridipennis Smith varied widely among the selected four colonies during various time intervals. In all the colonies bee traffic starts between 6 to 7 am and end by 7 to 7.10 pm. Bee traffic exhibited two peaks. One during 10 to 10.10 am and the other 2 to 3.10 pm. But in colony 4 the picture is different, where the morning peak was 11 to 11.10 am and the afternoon peak was 3 to 3.10 pm. Trigona iridipennis Smith shows great diversity in plant selection for dietary as well as resin sources. The shift towards ornamental plants for foraging may be an adaptation evolved in response to human modification of the environment. The bees collect resin from a variety of sources for building nest, its maintenance and also for defence. Bee traffic is found to be related to time, season, and strength of the colony. The bees preferred white and yellow coloured flowers than pink and red. The study also highlights the various food sources of Trigona iridipennis Smith in Kerala which can be further explored for flourishing melliponiculture.
Häftad, Engelska, 2016
502 kr
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E-bok
PDF, Engelska, 2016251 kr
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Scientific Study from the year 2014 in the subject Biology - Zoology, , language: English, abstract: The major species of stingless bees in Kerala is Trigona iridipennis Smith which are easy to domesticate due to low temperament and easy adaption to various habitats. Little is known about the variations that exist among them. We therefore conducted morphometric studies among workers and drones across 14 districts in Kerala with a view to characterize them. A total of 188 and 71 samples of drones and workers collected and analyzed various morphometric characters including head length (HL), head width (HW), proboscis length (PL), distance between two dorsal ocelli/lower intercocular distance (DBO), dorsal ocello-ocular distance (DOOD), antennal length (AL), thorax femur length (TFL), thorax tibia length (TTL), thorax metatarsus length (TML), thorax metatarsus width (TMW), thorax forewing length (TFWL), thorax forewing width (TFWW), pterostigma width (PtStW), pterostigma length (PtStW), hind wing length (HWL), hind wing width (HWW), number of hamuli (HAM), abdominal tergite length (AbTL), abdominal sternum width (AbSW), mandible length (MdL) and mandible width (MdW), head length width ratio (HLW), thorax metatarsus length width ratio (TMLW) and thorax forewing length width ratio (TFWLW). Our studies revealed that most of the worker morhopometric characters were positively correlated across all the districts in Kerala. However, there is not much significant differences among drones across various districts. Based on our studies, even though we detected significant differences among worker morhphotmetry we could not to find distinguishing and remarkable differences among collected samples. They may be interpreted as nutritional, seasonal and climatic factors.
E-bok
PDF, Engelska, 2016212 kr
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Scientific Study from the year 2016 in the subject Biology - Zoology, , language: English, abstract: Stingless bees are limited to tropics and subtropics with diversity in species and share morphological and behaviour patterns. Stingless bees are major pollinators of flowering plants in the tropics and improve crop productivity. Trigona iridipennis Smith were kept in India for centuries for the high medicinal value of honey as well as propolis and bee wax. A wide range of variations, especially worker and drone body size and measurement, were reported. Morphometric and geometric analysis provide a valuable tool for the differentiating variations among various honey bees and stingless bees. Based on these back ground, our objectives of this study were 1) to characterize the morphometric aspects of workers in this reported new species of stingless bees and 2) to identify the various similarities and differences existing based on factor and principal component analysis with Trigona iridipennis Smith. A total of 30 samples of workers were collected and various morphometric characters including head length (HL), head width (HW), proboscis length (PL), distance between two dorsal ocelli/lower intercocular distance (DBO), dorsal ocello-ocular distance (DOOD), antennal length (AL), thorax femur length (TFL), thorax tibia length (TTL), thorax metatarsus length (TML), thorax metatarsus width (TMW), thorax forewing length (TFWL), thorax forewing width (TFWW), pterostigma width (PtStW), pterostigma length (PtStW), hind wing length (HWL), hind wing width (HWW), number of hamuli (HAM), abdominal tergite length (AbTL), abdominal sternum width (AbSW), mandible length (MdL) and mandible width (MdW), head length width ratio (HLW), thorax metatarsus length width ratio (TMLW) and thorax forewing length width ratio (TFWLW) were analyzed. One sample (SS1) showed distinct differences in habitat preference (Laterite rock), appearance (size and colour), behaviour (passive) and nest architecture (narrow round entrance tube, snow white brood, cream white food pots). The present study based on the morphometry of stingless bees across Kerala shows that, in spite of the morphological and behavioural variations exhibited by the bees, members of all samples belong to Trigona iridipennis. But one sample (SS1) shows entirely different morphometric characteristics. It was found that this sample belongs to genus Lisotrigona
Häftad, Engelska, 2017
352 kr
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Häftad, Engelska, 2017
804 kr
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E-bok
PDF, Engelska, 2017212 kr
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Scientific Study from the year 2016 in the subject Biology - Botany, Mar Augusthinose College, language: English, abstract: Diabetes is a complex metabolic disorder resulting from either insulin insufficiency or insulin dysfunction. Diabetes mellitus affects most of the people in both developed and developing countries. The treatment of diabetes with synthetic drugs is costly and chances of side effects are high. Phytomedicine has been used since ancient times in various parts of the world where access to modern medicine is limited. Medicinal plants and phytoconstituents play an important role in the management of diabetes mellitus especially in developing countries where resources are meagre. Phytochemicals identified from medicinal plants present an exciting opportunity for the development of new types of therapeutics for diabetes mellitus. Most prevalent among phytochemical groups are the alkaloids, glycosides, polysaccharides, and phenolics such as flavonoids, terpenoids and steroids. This study aims to provide a comparative information about various plants used for antidiabetes treatment in a trial community (Mannans) and their constituents, which have been shown to display potent hypoglycemic activity. The current study was focused on four plants named Tinospora cordifolia, Ensete superbum, Coccinia grandis wild and Apama siliquosa Lam. which is locally known as Amruthu, Kalluvazha, Kattukoval, and Alpam respectively. The plant parts such as seed, leaves, stem and bark were used by the local people. The plant materials prepared as decoction, infusion, aqueous extracts in milk or honey were used for the treatment of diabetes. The plants that are being used by the local people of the study area have been isolated from plants for the treatment of diabetes. The efficacy of these ethnomedicinal plants needs to be subjected to pharmacological validation. it was found that Coccinia grandis was more efficient than the other plants. Some antidiabetic plants may exert their action by stimulating the function or number of beta-cells and thus increasing insulin release. The study highlighted the central role of traditional herbal medicine for the treatment of diabetes in tribal community. Ethnobotanical survey is most useful for scientists, research scholars and scientific companies for further studies on isolation and identification of active compounds that can be formulated into antidiabetic drugs.
Häftad, Engelska, 2017
352 kr
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E-bok
PDF, Engelska, 2017212 kr
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Scientific Study from the year 2016 in the subject Biology - Zoology, Mar Augusthinose College, language: English, abstract: Stingless bees are highly social insects which populated the tropical earth 65 million years ago longer than honey bees. They are limited to tropics and subtropics lacking venom apparatus and cannot sting. A little is reported so far about the domestication of the Trigona iridipennis Smith as well as the aspects of Meliponiculture in Kerala. Based on this back ground, the objectives of this study were to 1) characterize the various Meliponiculture techniques and management practices 2) the new techniques evolved for Meliponiculture practices and management as well as value addition of stingless bee products. Hundred and twenty farmers across Kerala engaged in Meliponiculture were interviewed and their Meliponiculture practices were observed and recorded. A questionnaire was prepared and distributed among the farmers to learn their depth of knowledge in stingless bee keeping techniques and to study the current status of Meliponiculture. In earthen bowl and coconut shell methods it is very advantageous to collect honey without causing any disturbance to the brood chamber that is at the bottom. In PVC pipe and coconut shell the colony often desert in summer due to high temperature. Even though the bamboo nodes are good, they are found to degenerate after a few years through the attack of wood borers. Stingless bee rearing is an important activity as it helps pollination and provides honey for various purposes. The bottle neck for Meliponiculture includes availability of colonies to start with, better techniques for colony capture, colony multiplication, honey extraction, processing and marketing. This study highlights the various drawbacks and flaws of traditional Meliponiculture in Kerala, which could be rectified using improved scientific management practices and tools. If correctly informed disseminated these techniques could be utilized by tribal, woman, old aged people and even children to fetch an extra income and also to serve the high demand of stingless bee honey and help to maintain the rich biodiversity of Kerala.
Häftad, Engelska, 2017
352 kr
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E-bok
PDF, Engelska, 2017396 kr
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Scientific Study from the year 2017 in the subject Biology - Genetics / Gene Technology, Mar Augusthinose College, language: English, abstract: Artocarpus heterophyllus belong to the Moraceae family and are abundant in Western Ghats. The fruit provide two MJ per kg/wet weight of ripe perianth and contain high levels of carbohydrates, protein, starch, calcium and vitamins. Jackfruit has diverse medicinal uses especially for anti-oxidant, anti-inflammatory, antimicrobial, anti-cancer and anti-fungal activity. MatK (maturase K) genes are fast evolving, highly variant regions of plant chloroplast DNA that can serve as potential biomarkers for DNA coding and also in generating primers for plants with identification of unique motif regions. Advances in the genetic markers such as RFLP and PCR based methods are more reliable for identification of genetic diversity than morphological markers, although each technique has advantages and limitations. The objective of this research work was to estimate the level of genetic diversity and to assess genetic relationships among six varieties of jackfruit using matK gene based on PCR technique and RFLP markers. The partial sequence of the matK gene of six different Artocarpus varities was used in the analysis. The size of amplified products was approximately 700 bp. After sequencing and sequence editing, sequence information on a 674 bp region was finally obtained for analysis. The alignment of sequences revealed two haplotypes out of 674 sites. The nucleotide frequencies are 30.00% (A), 37.69% (T/U), 17.93% (C), and 14.39% (G). Being one of the underutilized fruits in India, Artocarpus heterophyllus Lam. has promising leads to further scientific researches and livelihood strategies. The study of matK gene using PCR and RFLP seems to a promising tool in establishing genetic diversity among jackfruit varities. The tree, indigenous to the Western Ghats, is an important source of nutritious food during summer season. Encouragements should be made to the marketing as well as value added food products from this underutilized fruit tree.
Häftad, Engelska, 2017
751 kr
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E-bok
PDF, Engelska, 201716 kr
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Scientific Study from the year 2017 in the subject Agrarian Studies, Mar Augusthinose College, language: English, abstract: The Cucurbitaceae family is the one of the economically important groups of plants in the tropics and subtropics. Molecular phylogenetic analysis was advanced after the introduction of molecular markers which give much precise results in analysis. Our current study based on the amplification of RuBisco enzyme using rbcL primer and subsequent validation using BLAST, FASTA and CLUSTAL-W in pumpkin and winter melon. The isolated and purified DNA samples were PCR amplified using rbcL primer and later sequenced using ABI Prism 377 DNA sequencer. Multiple sequence alignment algorithms and distance matrix were constructed using rbcL sequences in FASTA format were retrieved from GenBank. Phylogenetic tree was created using the distance based neighbour joining (NJ) and clustering algorithms method. The agarose gel electrophoresis were used to separate the isolated as well as PCR amplified DNA samples. The sequences obtained after sequencing were subjected to BLAST similarity search and multiple sequence alignment using CLUSTAL-W. The construction of divergence matrix and phylogenetic dendrograms revealed two main groups, one consisting of MC and other Momordica species while the other group consisted of three subgroups of CM, CG and BH having members of Cucurbita, Coccinia and Momordica respectively. The reliability of molecular phylogenesis can be affected by myriad, long branch attraction, saturation and taxon sampling problems. So the selection of the models plays a key step in the success analysis. In general, the present study unambiguously confirmed the existence of Coccinia grandis as a distinct species and morphologic separation between Coccinia grandis and other selected members of Cucurbitaceae as separate species was evident. Among the species included in the present study Coccinia grandis undergone maximum divergence during the process of evolution. More detailed work on the evolution within the Cucurbitaceae needed for crop improvement.
Häftad, Engelska, 2017
310 kr
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E-bok
PDF, Engelska, 2017396 kr
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Scientific Study from the year 2016 in the subject Biology - Genetics / Gene Technology, Mar Augusthinose College, language: English, abstract: Jackfruit (Artocarpus heterophyllus) is commonly grown in home gardens of tropical and sub-tropical countries. The fruit contains high levels of carbohydrates, protein, starch, calcium and vitamins. Jack fruit has diverse medicinal uses, especially anti-oxidant, anti-inflammatory, anti-microbial, anti-cancer and anti-fungal activity. Jackfruit is considered to be an underutilized fruit where most of the fruits get wasted due to ignorance, lack of post harvest technology and gaps in supply chain systems. Jackfruit contains more protein, calcium, iron, vitamins and other essential nutrients as compared to the common fruits. To find out the morphological variation among jack fruits among Kerala we conducted an elaborative survey and found out the parameters such as tree characteristics, leaf characterises or fruit characteristics of selected samples. Both qualitative and quantitative data are measured using field visits and standard methods and morphological indicators; after analysis of data there is a morphological variation among the jack fruit samples identified. Advances in the genetic markers such as RFLP and PCR based methods are more reliable for identification of genetic diversity than morphological markers although each technique has advantages and limitations. The objective of this research work was to estimate the level of genetic diversity and to assess genetic relationships among six varieties of jackfruit using the rbcL gene based on PCR technique and RFLP markers. The partial sequence of rbcL gene of six different Artocarpus varieties was used in the analysis. The size of amplified products was approximately 700 bp. After sequencing and sequence editing, sequence information on a 651 bp region was finally obtained for analysis. The alignment of sequences revealed two haplotypes out of 651 sites. The nucleotide frequencies are 27.96% (A), 29.47% (T/U), 19.69% (C), and 22.89% (G). Being one of the underutilized fruits in India, Artocarpus heterophyllus Lam has promising leads to further scientific research and livelihood strategies. The study of rbcL gene using PCR and RFLP seems to be a promising tool in establishing genetic diversity among jackfruit varieties.
Häftad, Engelska, 2017
764 kr
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E-bok
PDF, Engelska, 2017212 kr
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Scientific Study from the year 2017 in the subject Agrarian Studies, Mar Augusthinose College, language: English, abstract: The Cucurbitaceae family is the one of the economically important group of plants in the tropics and subtropics. Molecular phylogenetic analysis were advanced after the introduction of molecular markers which give much precise results in analysis. Our current study based on the amplification of RuBisco enzyme using rbcL primer and subsequent validation using BLAST, FASTA and CLUSTAL-W in pumpkin and winter melon. The isolated and purified DNA samples were PCR amplified using rbcL primer and later sequenced using ABI Prism 377 DNA sequencer. Multiple sequence alignment algorithms and distance matrix were constructed using rbcL sequences in FASTA format were retrieved from GenBank. Phylogenetic tree was created using the distance based neighbour joining (NJ) and clustering algorithms method. Once divergences between all pairs of samples were determined, statistical cluster analysis and dendrogams examines the similarity among halotypes. Bootstrapping and jackknifing further increase the reliability estimates for the position of haplotypes within the evolutionary tree.
Häftad, Engelska, 2017
310 kr
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E-bok
PDF, Engelska, 2017397 kr
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Scientific Study from the year 2016 in the subject Agrarian Studies, grade: 1.5, Mar Augusthinose College, language: English, abstract: Glyphosate (N-phosphonomethylglycine) is a herbicide that is used worldwidely. Its common trade name is Roundup. Its non-targeted species action makes it most popular herbicide. It was developed by Monsanto company. The primary target for glyphosate is the enzyme EPSPS (5-enolpyruvoylshikimate 3-phosphate synthase). When glyphosate binds to EPSPS it forms a very stable complex that essentially permanently disables the enzyme and hence affect the metabolic activity of the plant and results in its death. Finding Glyphosate degrading microorganisms from soil is an interesting topic since glyphosate is non- targeted in its toxicity. Microorganisms were isolated from soil samples, which were then identified by molecular method. Isolation of DNA, its amplification using 16s rRNA gene and its sequencing are the major steps involved. Bioinformatics tool helps to identify the microorganisms. Two microorganisms identified are Pseudomonas sp. and Achromobacter sp. In the phylogenetic analysis also the two organisms are grouped as separate clads. In these, strain 1 showed highest growth in the Glyphosate containing medium than strain 2. These results show that the bacterial strain may possess potential to be used in bioremediation of glyphosate-contaminated environments.
Häftad, Engelska, 2017
731 kr
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E-bok
PDF, Engelska, 2017397 kr
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Scientific Study from the year 2017 in the subject Biology - Micro- and Molecular Biology, grade: 1.5, Mar Augusthinose College, language: English, abstract: The dyes are complex chemical compounds that imparts colour to substances. On the urge of urbanisation, the use of synthetic dyes is increasing largely and its untreated effluent release causes serious environmental pollution affecting water bodies by disturbing the aquatic ecosystem, soil, plants, animals, humans. The recalcitrant nature of these dyes limits its treatment using conventional methods wherein biological methods using microorganisms are reported to completely mineralize the dyes lowering the release of degradation products. The present work focuses on the biodegradation of synthetic dyes by isolating bacteria from a dyeing unit. Soil samples from the dye contaminated soils was collected, its degradation potentiality was observed using three major dye of studies congo red, brilliant green and methylene blue within 24 hr incubation. Maximum decoloarized dye (congo red and brilliant green) were chosen, serially diluted to 10-5 and plated to obtain two distinct colonies from decolorized congo red (CR1, CR2) and three distinct colonies from decolorized brilliant green (BG1, BG2, BG3). These isolates were biochemically characterized. Molecular characterization was performed by isolating DNA from five isolates and amplified it using PCR, with the 16s rRNA gene primer. The PCR amplification product having approximately 1500bp were sequenced, edited and searched using BLAST against the known sequences within NCBI databases. The isolates were identified to be CR1 as Pseudomonas (88% identity), CR2 as Aeromonas (89% identical) and BG1/BG2 were confirmed to belong to same genus as Bacillus (99% identical). The phylogenetic tree showed a clear divergence between isolated species. Furthermore, the dye tolerance of isolates were observed by optimization analysis to be as CR1 and CR2 tolerated up to 4% of congo red dye and among BG1, BG2 and BG3; BG1 tolerated up to 0.50% of brilliant green dye. Thus, CR1 and CR2 were observed to be potent azo dye decolourizers. Recombinant DNA Technology can be applied in this field that can make the above future application more reliable.
Häftad, Engelska, 2017
804 kr
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E-bok
PDF, Engelska, 2017397 kr
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Scientific Study from the year 2017 in the subject Computer Science - Applied, grade: 1,5, Mar Augusthinose College, language: English, abstract: Provable data possession (PDP) is a technique for ensuring the integrity of data in storage outsourcing. In this scheme, we address the construction of an efficient PDP scheme for distributed cloud storage to support the scalability of service and data migration, in which we consider the existence of multiple cloud service providers to cooperatively store and maintain the clients' data. We present a cooperative PDP (CPDP) scheme based on homomorphic verifiable response and hash index hierarchy. We prove the security of our scheme based on multi-prover zero-knowledge proof system, which can satisfy completeness, knowledge soundness, and zero-knowledge properties. In addition, we articulate performance optimization mechanisms for our scheme, and in particular present an efficient method for selecting optimal parameter values to minimize the computation costs of clients and storage service providers. Our experiments show that our solution introduces lower computation and communication overheads in comparison with non-cooperative approaches. Using MR-PDP to store treplicas is computationally much more efficient than using a single-replica PDP scheme to store t separate, unrelated files (e.g., by encrypting each file separately prior to storing it). Another advantage of MR-PDP is that it can generate further replicas on demand, at little expense, when some of the existing replicas fail. The generation of replicas is on demand by the user's request that is based on the security choice selected by the user at the time of file upload. The user can choose three options Low, Medium, High at the time of file upload. The uploaded file is divided in to N blocks of different sizes to achieve the efficiency in storage and is also used to improve security, here N represent the number of clouds we are using. Low means the file is divided into N blocks (here 3), and each block is stored in N different location of the single cloud. Medium means the file is divided into N blocks and each block is stored in N different clouds which improves the security of data but reduce the availability. High means the file is divided into N blocks and each N block is stored in N different clouds that are we are keeping the replicas of file in N different clouds. The system maintains a download count to dynamically create the replicas in accordance with the users demand.
Häftad, Engelska, 2017
751 kr
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E-bok
PDF, Engelska, 2017212 kr
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Scientific Study from the year 2016 in the subject Chemistry - Bio-chemistry, grade: 1.5, Mar Augusthinose College, language: English, abstract: Amylase is an enzyme which catalyzes the hydrolysis of a (1, 4)-glycosidic linkages in amylose (a linear form of starch), amylopectin (a branched form of starch) and glycogen into simpler carbohydrate molecules such as oligosaccharides or disaccharides. Alpha-amylase is the major form of amylase found in human, most prominently in pancreatic juice and saliva. The salivary amylase is an amylolytic enzyme, which can acts on cooked or boiled starch and converts it in to maltose. So it became interesting to study the behaviour of salivary amylase, when it is secreted as result of different stimuli. And thus began to study the effect of five different stimulatory temperatures, and also the effect of four tastes on the behaviour of salivary amylase. For the study of stimulatory effect of temperature on salivary amylase, five different temperatures are selected (4, 27, 37, 55 and 75 C). And likewise four tastes also selected (sweet, sour, salt and bitter). The DNS method was done in the both tests to obtain the absorbance at 520 nm. The samples were collected from three people, of same age. The saliva was collected at same time, after one and a half hour of their breakfast in order to maintain a controlled condition for this study. In each cases the incubation temperature also kept as variable (4, 27, 37, 55 and 75 C). This study was also aimed to determine the behaviour of salivary amylase with reference to the kinetic parameters like Km and Vmax of salivary alpha amylase by incubating the enzyme (stimulated by different stimulatory conditions of temperature and taste) with varying concentration of substrate. The study revealed the consistency in kinetic parameters like Km and Vmax of salivary alpha amylase secreted in response to various stimuli.