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You searched for subject:(Feather degradation). Showing records 1 – 3 of 3 total matches.

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Vytautas Magnus University

1. Dižavičienė, Ona. Keratinazių taikymo galimybių tyrimas.

Degree: Master, Biology, 2012, Vytautas Magnus University

Pasaulyje kasmet susikaupia keli milijonai tonų plunksnų atliekų, kurios susidaro paukščių perdirbimo įmonėse, ūkiuose. Taip pat keratino atliekų susidaro ir skerdyklose, maisto (mėsos perdirbimo) ir rauginimo pramonės įmonėse (vilna, plunksnos, šeriai, kanopos, nagai, ragų ir t.t.). Visos šios atliekos teršia ne tik dirvožemį ir vandenį, tačiau neatsiejamai paveikia ir žmogaus sveikatą, pavyzdžiui dermatofitų sukeltos infekcijos, bakterijų ir mikoplazmų sukeliamos ligos (salmoneliozė), virusų sukeliamos ligos (paukščių gripo plitimas). Šio darbo tikslas – sukurti efektyvias ir nebrangias skystų bei kietų keratino turinčių atliekų utilizavimo technologijas, skirtas įmonėms, tvarkančioms keratino atliekas. Atlikus tyrimus nustatyti optimalūs skystų keratino turinčių atliekų, valymo proceso technologiniai parametrai: keratinų kiekis – 0,35 %, fermentinio preparato (A. fradiae 119) – 5-10 %, skystų atliekų skaidymo temperatūra nuo 10 iki 40 °C. Įvertinus keratinus skaldančių B. subtilis 103 ir A. fradiae 119 produkuojamų fermentų keratinų skaidymą esant riebalams nustatyta, kad riebalai apsunkina keratino atliekų skaidymą (suskaidymo efektyvumas sumažėja apie 10 %). Sukurta vamzdynų valymo technologija. Keratino atliekos vamzdyje skaidomos naudojant 10 % A. fradiae 119 preparatą. Efektyviausiai kompleksinės keratino-riebalų modelinės atliekas skaidė biopreparatą Nr.2, kuriame keratinus skaidančius fermentus sintetino A. fradiae 119 mikroorganizmai, o riebalus skaidė lipazinis... [toliau žr. visą tekstą]

A few million tons of feather waste produced in fowl processing facilities and farms are accumulated every year in the world. Moreover, keratin wastes are also found in slaughterhouses, food (meat processing) and tanning industry companies (wool, feather, bristle, hooves, nails, horns, etc.). All those wastes not only contaminate soil and water, but also influence human health, e.g., dermatophyte infections, bacteria and mycoplasmas inflicted diseases (salmonellosis), viral infections (the spread of avian influenza). The aim of this work is to create effective and inexpensive liquid and solid keratin waste utilization technologies for companies managing keratin wastes. Optimal cleaning process’ technological parameters of liquid keratin waste were determined experimentally: keratin amount – 0,35%, enzyme preparation (A. fradiae 119) – 5-10%, liquid waste dissociation temperature from 10 to 40 °C. After the evaluation of keratin degrading enzymes produced by B. subtilis 103 and A. fradiae 119 in presence of fats, was identified that fats impeded the degradation of keratin waste (degradation effectiveness fell by about 10%). The piping cleaning technology was created. In a pipe keratin wastes are degraded by using a 10% preparation of A. fradiae 119. Complex model keratin-fat wastes most effectively degraded bio-preparation No.2, where keratin degrading enzymes were synthesized by A. fradiae 119 microorganisms and fats were dissolved with a lipasic enzyme produced by E.... [to full text]

Advisors/Committee Members: Grigiškis, Saulius (Master’s thesis supervisor), Maciulevičienė, Rūta (Master’s thesis reviewer).

Subjects/Keywords: Keratinazė; Plunksnos; Skaidymas; Keratinase; Feather; Degradation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Dižavičienė, Ona. (2012). Keratinazių taikymo galimybių tyrimas. (Masters Thesis). Vytautas Magnus University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120620_144539-28219 ;

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Author name may be incomplete

Chicago Manual of Style (16th Edition):

Dižavičienė, Ona. “Keratinazių taikymo galimybių tyrimas.” 2012. Masters Thesis, Vytautas Magnus University. Accessed April 22, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120620_144539-28219 ;.

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Author name may be incomplete

MLA Handbook (7th Edition):

Dižavičienė, Ona. “Keratinazių taikymo galimybių tyrimas.” 2012. Web. 22 Apr 2019.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

Dižavičienė, Ona. Keratinazių taikymo galimybių tyrimas. [Internet] [Masters thesis]. Vytautas Magnus University; 2012. [cited 2019 Apr 22]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120620_144539-28219 ;.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

Dižavičienė, Ona. Keratinazių taikymo galimybių tyrimas. [Masters Thesis]. Vytautas Magnus University; 2012. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120620_144539-28219 ;

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

2. Al-Murayati, Haider. Diversity of the bacterial community and secondary sexual characters in the peacock : Diversité de la communauté bactérienne et caractères sexuels secondaires chez le paon.

Degree: Docteur es, Biologie, 2017, Paris Saclay

Les plumes d'oiseaux abritent de nombreux microorganismes qui pourraient être acquis dans l'environnement, ces microorganismes pouvant exercer une sélection intense sur leurs hôtes en réduisant leur fécondité et leur survie. Plusieurs taxons bactériens qui vivent sur des plumes ont la capacité de dégrader la kératine des plumes et causent des dommages à leur structure et peuvent modifier aussi leur coloration. Les oiseaux utilisent des signaux visuels tels que des couleurs vives ou des ornementations exagérées pour la communication socio-sexuelle ainsi que la reconnaissance des espèces. Seuls les individus en bonne santé sont capables de produire des caractères sexuels secondaires exagérés et restent résistants aux parasites débilitants. Le paon (Pavo cristatus) est une espèce polygame qui a plusieurs décorations exagérées, les caractères sexuels secondaires les plus remarquables du paon sont leur traîne décorée avec des ocelles magnifiques qui contiennent trois couleurs irisées différentes. Grâce à une technique basée sur la culture, j'ai isolé la communauté bactérienne des plumes de différentes parties colorées des ocelles de la traîne du paon. L'étude révèle qu'il y a eu une répartition hétérogène des bactéries parmi les différentes parties colorées des ocelles. L'abondance et la prévalence des taxa bactériens spécifiques étaient liées au degré de dégradation des plumes, à l'expression de différents caractères sexuels secondaires, à des changements dans la coloration des ocelles et à l'augmentation de la croissance quotidienne des plumes. En outre, nous avons constaté un petit effet de l'expression de caractères sexuels secondaires sur la proportion sexuelle des couvées avec un biais en faveur des individus masculins. Les travaux présentés dans cette thèse fournissent des preuves que les ocelles de plumes peuvent être considérés comme un signal fiable de la diversité et de l'abondance de bactéries chez le paon. En conséquence, ils représentent une indication pour la qualité individuelle, ce qui permet aux femelles de choisir des mâles avec une communauté bactérienne spécifique.

Bird feathers harbour numerous microorganisms that could be acquired from the surrounding environment, these microorganisms may exert intense selection on their hosts by reducing fecundity and survivorship. Several bacterial taxa that live on feathers have the ability to degrade feather keratin and cause damage to feather structure and may alter the feather colouration. Birds use visual signals such as bright colours or exaggerated ornamentation for socio-sexual communication as well as species recognition. Only healthy individuals are able to produce exaggerated secondary sexual characters and still remain resistant to debilitating parasites. Peacocks (Pavo cristatus) is a polygamous species that have different exaggerated ornamentation, the most notable secondary sexual characters of the peacock are their long-decorated trains that comprise the magnificent ocelli which contain three different iridescent colours. Through a culture based…

Advisors/Committee Members: Møller, Anders Pape (thesis director).

Subjects/Keywords: Pavo cristatus; Diversite bactérienne; Barbules; Barbes; Dégradation des plumes; Incréments de croissance quotidienne; Coloration des plumes; Traîne paon ocelles; Sexe ratio; Caractère sexuel secondaire; Pavo cristatus; Bacterial diversity; Barbules; Barbs; Feather degradation; Daily growth increments; Feather colouration; Peacock train ocelli; Sex ratio; Secondary sexual characters

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Al-Murayati, H. (2017). Diversity of the bacterial community and secondary sexual characters in the peacock : Diversité de la communauté bactérienne et caractères sexuels secondaires chez le paon. (Doctoral Dissertation). Paris Saclay. Retrieved from http://www.theses.fr/2017SACLS096

Chicago Manual of Style (16th Edition):

Al-Murayati, Haider. “Diversity of the bacterial community and secondary sexual characters in the peacock : Diversité de la communauté bactérienne et caractères sexuels secondaires chez le paon.” 2017. Doctoral Dissertation, Paris Saclay. Accessed April 22, 2019. http://www.theses.fr/2017SACLS096.

MLA Handbook (7th Edition):

Al-Murayati, Haider. “Diversity of the bacterial community and secondary sexual characters in the peacock : Diversité de la communauté bactérienne et caractères sexuels secondaires chez le paon.” 2017. Web. 22 Apr 2019.

Vancouver:

Al-Murayati H. Diversity of the bacterial community and secondary sexual characters in the peacock : Diversité de la communauté bactérienne et caractères sexuels secondaires chez le paon. [Internet] [Doctoral dissertation]. Paris Saclay; 2017. [cited 2019 Apr 22]. Available from: http://www.theses.fr/2017SACLS096.

Council of Science Editors:

Al-Murayati H. Diversity of the bacterial community and secondary sexual characters in the peacock : Diversité de la communauté bactérienne et caractères sexuels secondaires chez le paon. [Doctoral Dissertation]. Paris Saclay; 2017. Available from: http://www.theses.fr/2017SACLS096

3. Jackson, Benjamin. Regulation of litter decomposition in forest ecosystems of Sweden and New Zealand.

Degree: 2012, Swedish University of Agricultural Sciences

Litter decomposition is a core ecosystem process critical for carbon and nutrient cycling, and the functioning of terrestrial ecosystems. This thesis explores two contrasting ways by which plants can influence litter decomposition in forested ecosystems. The first half of the thesis examined the role of feather mosses in mediating the environmental conditions on the soil surface in boreal forests and the impact this has on litter decomposition. The feather moss layer intercepts much of the litterfall in boreal forests as well as retaining significant quantities of rainfall. The results showed that the pattern of moisture inputs to the moss layer was a major driver of litter decomposition and moss-associated cyanobacterial N2-fixation. Under conditions of limited moisture availability the mosses promoted the decomposition of leaf litter within the moss layer by preventing the desiccation of the litter, maintaining decomposer activity. In this way the effect of the moss layer was dependent on the prevailing moisture conditions. Further, the results showed that the moss layer promoted the decomposition of intercepted leaf litter to a similar extent across all stages of a 360-year successional gradient, despite a large increase in the depth of the moss layer and changing ecosystem properties. The second half of the thesis investigated two poorly explored aspects of the relationships between plant functional traits, litter quality and litter decomposition in temperate rain forests in New Zealand. The results showed that the decomposition of leaf, twig and wood litter of 27 co-occurring tree species was uncoordinated. This lack of coordination occurred because wood decomposition was driven by differences in the wood density of trees, which itself was unrelated to the chemical traits driving the decomposition of leaf and twig litter. The results also revealed a high degree of intraspecific variation in the leaf functional traits and leaf litter decomposition of 16 co-occurring plant species. Within species, leaf traits varied predictably in response to a soil nutrient gradient but were not related to the variations in decomposition. Overall, the results of this thesis illustrate the important and contrasting impacts that plants can have on litter decomposition, and contributes to the understanding of the complex interactions between multiple factors that regulate litter decomposition in forest ecosystems.

Subjects/Keywords: boreal forests; temperate rain forests; forest litter; degradation; bryophyta; deadwood; boreal forest; temperate rain forest; litter decomposition; feather moss; succession; plant functional traits; coarse woody debris; intraspecific variation

…decomposer subsystem broadly performs two key functions, the degradation and mineralisation of dead… …Nilsson & Wardle, 2005). Feather mosses are an important functional group of plants in the… …dominate the boreal forest understory, ericaceous dwarf shrubs and feather mosses. Feather mosses… …2009; Wardle, 2003). Like all bryophytes, feather mosses are also poikilohydric… …Further, boreal feather mosses host cyanobacteria capable of fixing atmospheric N that can be… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Jackson, B. (2012). Regulation of litter decomposition in forest ecosystems of Sweden and New Zealand. (Doctoral Dissertation). Swedish University of Agricultural Sciences. Retrieved from http://pub.epsilon.slu.se/9227/

Chicago Manual of Style (16th Edition):

Jackson, Benjamin. “Regulation of litter decomposition in forest ecosystems of Sweden and New Zealand.” 2012. Doctoral Dissertation, Swedish University of Agricultural Sciences. Accessed April 22, 2019. http://pub.epsilon.slu.se/9227/.

MLA Handbook (7th Edition):

Jackson, Benjamin. “Regulation of litter decomposition in forest ecosystems of Sweden and New Zealand.” 2012. Web. 22 Apr 2019.

Vancouver:

Jackson B. Regulation of litter decomposition in forest ecosystems of Sweden and New Zealand. [Internet] [Doctoral dissertation]. Swedish University of Agricultural Sciences; 2012. [cited 2019 Apr 22]. Available from: http://pub.epsilon.slu.se/9227/.

Council of Science Editors:

Jackson B. Regulation of litter decomposition in forest ecosystems of Sweden and New Zealand. [Doctoral Dissertation]. Swedish University of Agricultural Sciences; 2012. Available from: http://pub.epsilon.slu.se/9227/

.