1,720,956 research outputs found
Growth, antioxidant capacity and total carotene of Dunaliella salina dccbc15 in a low cost natural seawater medium.
No full textDunaliella is currently drawing worldwide
attention as an alternative source of nutraceuticals. Commercially,
b-carotene making up over 10 % of Dunaliella
biomass is generating the most interest. These compounds,
because of their non-toxic properties, have found applications
in the food, drug and cosmetic industry. The b-carotene content
of Dunaliella cells, however, depends heavily on the
growth conditions and especially on the availability of nutrients,
salinity, irradiance and temperature in the growth medium.
A chemically well defined medium is usually required,
which significantly contributes to the cost of pigment production;
hence a desire for lowcostmarinemedia. The present
study aimed at evaluating the suitability of six differentmedia,
especially exploiting local potential resources, for the mass
production of Dunaliella salinaDCCBC15 as functional food
and medicine. The efficacy of a new selected low-cost enriched
natural seawater medium (MD4), supplemented with
industrial N–P–K fertilizer, was investigated with respect to
biomass production, chlorophyll, antioxidant capacity, and
total carotene by Dunaliella though culture conditions were
not optimized yet. This new medium (MD4) appears extremely
promising, since it affords a higher production of
Dunaliella biomass and pigments compared with the control,
a common artificial medium (MD1), while allowing a substantial
reduction in the production costs. The medium is also
recommended for culturing other marine algae
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Identification of Dunaliella Viridis Using ITS Markers
Full text linkThe phylogenetic position and taxonomic status of the green alga Dunaliella viridis was investigated based on
internal transcribed spacer (ITS) markers. The alga was isolated from saltern in Vinh Hao, Binh Thuan province,
Vietnam. Independent phylogenetic trees of ITS1 and ITS2 sequences revealed that the alga belongs to the clade
of Dunaliella viridis. The salinity for optimal growth of the alga was 2M NaCl, which was much lower than the
original sampling site (4M NaCl). This tolerance to a wide range of salinity may provide distinct advantages to
Dunaliella viridis over its competitors in natural environments. Further physiological and biochemical
characteristics of this strain will need to be investigated in order to assess its potential for algal biomass
production and other applications such as beta-carotene, carbohydrate, lipid and protein for feed, food,
aquaculture and biofuels, including opening new search for other Dunaliella species
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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