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Wyświetlanie 1-10 z 53
Tytuł:
α-Carotene and its derivatives have a sole chirality in phototrophic organisms?
Autorzy:
Takaichi, Shinichi
Murakami, Akio
Mochimaru, Mari
Yokoyama, Akiko
Tematy:
red algae
chirality
β-carotene
algae
carotenoid
α-carotene
Pokaż więcej
Wydawca:
Polskie Towarzystwo Biochemiczne
Powiązania:
https://bibliotekanauki.pl/articles/1039810.pdf  Link otwiera się w nowym oknie
Opis:
Carotenoids in eukaryotic phototrophic organisms can be classified into two groups; β-carotene and its derivatives, and α-carotene and its derivatives. We re-examined distribution of α-carotene and its derivatives among various taxa of aquatic algae (17 classes) and land plants. α-carotene and its derivatives were found from Rhodophyceae (macrophytic type), Cryptophyceae, Euglenophyceae, Chlorarachniophyceae, Prasinophyceae, Chlorophyceae, Ulvophyceae, Charophyceae, and land plants, while they could not be detected from Glaucophyceae, Rhodophyceae (unicellular type), Chryosophyceae, Raphidophyceae, Bacillariophyceae, Phaeophyceae, Xanthophyceae, Eustigmatophyceae, Haptophyceae, and Dinophyceae. We also analyzed the chirality of α-carotene and/or its derivatives, such as lutein and siphonaxanthin, and found all of them had only (6'R)-type, not (6'S)-type.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Springtails (Collembola, Hexapoda) inhabiting algae with different degrees of waste product contamination
Autorzy:
Olejniczak, Izabella
Boniecki, Paweł
Kaliszewicz, Anita
Panteleeva, Ninel
Tematy:
algae
springtails
waste products
Pokaż więcej
Wydawca:
Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie
Powiązania:
https://bibliotekanauki.pl/articles/470577.pdf  Link otwiera się w nowym oknie
Opis:
The study was carried out in July 2009 in Murmansk (68°57’ N; 33°03’E) and involved algae that had washed up at the edge of the intertidal zone of Kola Bay. Two areas of algae were selected for this study: uncontaminated (algae I) and algae contaminated with waste products (algae II). The material was collected using a frame with an area of 100 cm2. A total of 40 samples were taken. The abundance of the springtails was almost three times lower in the contaminated algae than in the uncontaminated algae, whereas the species diversity of the springtail communities was much higher in the contaminated algae. The littoral species Hypogastrura viatica was the dominant species in the uncontaminated algae, and that in the contaminated algae was the cosmopolitan species Folsomia quadriuculata. It appears that the contamination of the algae with waste products can promote the intensification of competition among springtails and between springtails and other saprophagous invertebrates
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of Biodiesel from Local Available Algae in Jordan
Autorzy:
Aljabarin, N.
Al Jarrah, A.
Tematy:
algae
biodiesel
Almansora
Jordan
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Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:
https://bibliotekanauki.pl/articles/123308.pdf  Link otwiera się w nowym oknie
Opis:
The present study aims at producing diesel out of algae. The production of biodiesel was performed at Tafila Technical University laboratories. The algae were brought from Almansora stream at Tafila governorate - Jordan and afterwards dried in an oven at 80 °C for 12 hours. The dried algae were ground using disc mill until powder was obtained. The powdered algae underwent a distillation process with the addition of iron sulphate hydrate to the algae using a distillation column in order to extract the oil. Methanol was added to the oil, which was obtained from the distillation and using potassium hydroxide as a catalyst, the product was then separated in a funnel for about 10 hours until two layers of the solution were obtained; the organic layer represents the biodiesel. The biodiesel attributes are similar to the diesel oil, except that it reduces the emission of carbon dioxide CO2 and there is no emission of sulphur dioxide SO2.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algae as an alternative to the methods of production and use of conventional biomass (review article)
Autorzy:
Plata, Piotr
Tematy:
algae
bioeconomy
biofuels
biorefinery
Pokaż więcej
Wydawca:
Instytut Polityki Energetycznej im. Ignacego Łukasiewicza
Powiązania:
https://bibliotekanauki.pl/articles/31342803.pdf  Link otwiera się w nowym oknie
Opis:
Algae have been present in the water treatments technologies, food for animals makingprocesses or even for diet supplements production for many years now. Recent years, however, have brought a number of ideas and discoveries for a wider use of these autotrophs. Their use is related to the broadly understood environmental protection and many threads of combating climate change. Currently, one of the most common ways of using algae is the production of liquid biofuels of the 3rd and 4th generation and unconventional biomass generation. Biofuels obtained from algae, in addition to lower amounts of harmful substances contained in them, are often characterized by a negative emission balance. It is related to the fact that those organisms, being in an exponential growth phase, assimilate the carbon dioxideneeded for photosynthesis. The production of energy substances from algae and microalgae in the teeth of draining fossil fuel deposits and their destructive impact on the environment. That sooth combined with the ease and low cost of culture, condition they become a real alternative to existing energy sources. Unique properties of algae linked with the fact that they are among the best, known biological energy converters opens the way to a number of opportunities to use them in other economic sectors. Certainly, the technological revolution in the energy market in addition to the requirement to create the most efficient reactors, in-depth research on the properties of fuels and the producers themselves still needs to be regulated by law. Algae can be grown in polluted waters, and the energy raw materials produced from them are able to reach (without emission logistic costs) a negative balance of CO2 emissions. This phenomenon and the fact that apart from fuels and biogas, they can be used for purposes such as carbon sequestration, creating energy biomass, medicines and dietary supplements, as well as food for animals, for example, the most reasonable choice would be to create advanced regulations regarding the closed- circuit policy in the energy sector, based precisely on biologically active organisms. This work focuses on gathering and presenting basic information regarding current technologies related to algae, their potential uses in the energy sector, and the long-term prospects for their development. It also takes into account the issues associated with the holistic nature of energy harvesting methods such as the one discussed.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przegląd fotobioreaktorów do produkcji biodiesla
Overview of photobioreactors for the production of biodiesel
Autorzy:
Patyna, A.
Witczak, S.
Tematy:
algi
biodiesel
fotobioreaktor
algae
photobioreactor
Pokaż więcej
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Powiązania:
https://bibliotekanauki.pl/articles/1208869.pdf  Link otwiera się w nowym oknie
Opis:
Biomasa glonów coraz częściej uważana jest za potencjalny surowiec mogący służyć do produkcji biopaliw (biodiesel, biogaz) oraz energii elektrycznej i cieplnej. Ze względu na wyczerpujące się zasoby ropy naftowej, a także wzrost zanieczyszczenia środowiska, prowadzone są coraz szersze badania w zakresie wykorzystania biomasy alg jako źródła energii odnawialnej. Dodatkowo wysoka zawartość lipidów w komórkach alg i wiele innych zalet sprawia, że biodiesel produkowany z oleju pozyskanego z mikroalg może być właściwą alternatywą dla uszczuplających się zasobów diesla wytwarzanego z paliw kopalnych. Hodowla alg nie wymaga dużych powierzchni, a także używania czystej wody pitnej. W dodatku wskaźnik produkcji biomasy alg jest dużo wyższy niż roślin naczyniowych. Pod względem technologicznym sam proces produkcji biodiesla z alg jest podobny do analogicznego procesu produkcji tego paliwa z oleju roślinnego. By zacząć produkować biodiesel z mikroalg na skalę przemysłową, trzeba odpowiedzieć na ważne pytania związane z opłacalnością wytwarzania ich biomasy w różnych typach foto- bioreaktorach. W pracy dokonano oceny efektywności hodowli mikroalg w zamkniętych fotobioreaktorach o różnej konstrukcji i warunkach ich eksploatacji. Produkcja biomasy i biopaliw odbywa się wg dwóch głównych faz: procesu wstępnego (upstream) i końcowego (downstream). Proces wstępny obejmuje różne technologie hodowlane, których celem jest otrzymanie biomasy w jak największej ilości i o jak najlepszej jakości. Etap końcowy związany jest z kolei z doborem technologii zbioru alg i produkcji biopaliw.
The algae biomass is increasingly being recognized as a potential raw material which may be used for the production of biofuels (biodiesel, biogas), electricity and thermal energy. Due to the depleting oil reserves and also the increase of environmental pollution, research is progressively being conducted on the use of the algae biomass as a source of renewable energy. Additionally a high content of lipids in the algae cells and a lot of other advantages make the biodiesel produced from oil obtained from micro-algae a proper alternative for the depleting diesel sources produced from fossil fuels. Algae breeding neither requires large amounts of areas, nor clean drinking water. Additionally, the biomass production ratio of algae is much higher than of vascular plants. In terms of technology the production process of biodiesel from algae itself is similar to the analogous production process of this fuel from vegetable oil. In order to produce biodiesel from microalgae on an industrial scale, it is necessary to answer important questions related to the profitability of producing biomass in different types of photobioreactors. The thesis contains the evaluation of the effectiveness of breeding microalgae in closed photobioreactors of different structures and under different exploitation conditions. Biomass and biofuels are produced according to two main phases: the initial (upstream) process and the final (downstream) process. The initial process covers different breeding technologies the aim of which is to obtain the largest amount of biomass of the best quality. The final stage relates to the choice of the technology of harvesting algae and of producing biofuels.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processing and Performance of Blended Biodiesel Produced from Microalgae Pediastrum Boryanum
Autorzy:
Chellappa, Thiago
da Silva, Raphael Eliedson
Filgueira, Mário Sérgio Gomes
Rabelo, Daniela Aisha Silva de Souza
Lira, Isadora Patriota de Aguiar
Bremgartner, Afra Raquel de Almeida
Bragato, Marcos
Santos, Dino Lincoln Figueirôa
Rosa, José Guilherme da Silva Santa
Chellappa, Naithirithi T.
Sanábio, Robson Guimarães
Nascimento, Rubens M.
Tematy:
biodiesel
diesel
algae
esterification
transesterification
residue
Pokaż więcej
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Powiązania:
https://bibliotekanauki.pl/articles/2069909.pdf  Link otwiera się w nowym oknie
Opis:
In this present study, biodiesel was synthesized as per ASTM method by using algae as a raw material, which in the environment is considered as being a harmful waste and of a nature that blooms in ponds, lakes and reservoirs. In order to improve fuel quality, the transesterification process was carried out in this study so as to remove fatty acids and thereafter, analyze several fuel parameters of the biodiesel were determined. The calorific value of the biodiesel and its specific gravity was 42660 kJ/kg and 0.803 g/cm3 respectively. The viscosity of the sample was found to be 1.99. The cetane number of diesel fuel ranged from 40 to 55 and for the biodiesel it was found to be 47. The flashpoint and firepoint of the sample was recorded as 80°C and 94°C respectively. The conclusion is that it is worthy to mention that this process does not require high-end technology; hence, it could be used in the energy generation process in remote areas and as an alternative resource, as well.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 53

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