1,720,954 research outputs found
Hatching of artemia franciscana and it’s performance in fertilized ponds
No full textMSc DissertationThis study was conducted to assess the general performance
of Artemia franciscana from saltworks in Tanga, Tanzania. The
study aimed to determine Artemia cysts’ biometry and hatching
efficiency, and effect of pond fertilization on growth
performance and nutritional composition of Artemia. For the
study on biometry and hatching efficiency, Artemia cysts were
collected from salt farms in Tanga, Tanzania, using a 100-150
mesh net. Then the cysts were processed and packed in
airtight containers. In the laboratory, the diameter of each cyst
was measured from a sub sample of 200 cysts and another
sub-samples were incubated in beakers at 28 °C, 35 ppt, and
a pH of 8. After 24 hours, newly hatched nauplii were moved in
triplicate to the culturing tanks, where they were cultured for 15
days while being fed microalgae (Nannochloropsis oculate). As
a reference, the Vinh Chau Artemia cyst strain (from Vietnam)
was used as control. The findings showed that Artemia cyst
from Tanga had a higher value of capsulated cyst diameter
(213.4μm) and chorion thickness (9.7μm) compared to Vinh
Chau Artemia cysts (208.3 μm; 8.3 μm) respectively. Also, a
higher hatching percentage and efficiency was observed in
Vinh Chau Artemia cyst compared to Tanga (p < 0.05).
However a higher growth performance and survival
percentage (74.56%) were observed in Tanga Artemia strain
compared to Vinh Chau Artemia strain (53.85%) which is very
promising. Hence, Tanga Artemia strain showed good quality
hence its prospects to production in pond. However, the study
on the effects of pond fertilization, examined the growth
performance and nutritional composition of Artemia. At 28 °C,
35 ppt, and a pH of 8, six buckets each holding 20 liters of
water were used to hatch a total of 30g cysts. The newly
hatched nauplii were then inoculated in triplicates into the fertilized and non-fertilized ponds, where they were cultured for
28 days at a density of 100 nauplii/litre. The results on
Artemia’s growth performance and nutritional composition
were significantly greater in fertilized ponds (p<0.05).
Phytoplankton communities were also more abundant in
fertilized ponds compared to non-fertilized ponds. All the
environmental parameters monitored were within the
recommended range for example the mean salinity was above
70ppt. The findings from this study suggested that pond
fertilization is of great importance for quality and optimal
production of Artemia in ponds. The results of this study lead
to the conclusion that Tanga cysts exhibit good biometric
characteristics as well as good growth performance when
exposed to pond fertilization. As a result, we recommend
further research in order to enhance more traits of the local
Artemia breed in pond production.The Western Indian Ocean Marine Science Association (WIOMSA
Hatching of artemia franciscana and it’s performance in fertilized ponds
No full textMSc DissertationThis study was conducted to assess the general performance
of Artemia franciscana from saltworks in Tanga, Tanzania. The
study aimed to determine Artemia cysts’ biometry and hatching
efficiency, and effect of pond fertilization on growth
performance and nutritional composition of Artemia. For the
study on biometry and hatching efficiency, Artemia cysts were
collected from salt farms in Tanga, Tanzania, using a 100-150
mesh net. Then the cysts were processed and packed in
airtight containers. In the laboratory, the diameter of each cyst
was measured from a sub sample of 200 cysts and another
sub-samples were incubated in beakers at 28 °C, 35 ppt, and
a pH of 8. After 24 hours, newly hatched nauplii were moved in
triplicate to the culturing tanks, where they were cultured for 15
days while being fed microalgae (Nannochloropsis oculate). As
a reference, the Vinh Chau Artemia cyst strain (from Vietnam)
was used as control. The findings showed that Artemia cyst
from Tanga had a higher value of capsulated cyst diameter
(213.4μm) and chorion thickness (9.7μm) compared to Vinh
Chau Artemia cysts (208.3 μm; 8.3 μm) respectively. Also, a
higher hatching percentage and efficiency was observed in
Vinh Chau Artemia cyst compared to Tanga (p < 0.05).
However a higher growth performance and survival
percentage (74.56%) were observed in Tanga Artemia strain
compared to Vinh Chau Artemia strain (53.85%) which is very
promising. Hence, Tanga Artemia strain showed good quality
hence its prospects to production in pond. However, the study
on the effects of pond fertilization, examined the growth
performance and nutritional composition of Artemia. At 28 °C,
35 ppt, and a pH of 8, six buckets each holding 20 liters of
water were used to hatch a total of 30g cysts. The newly
hatched nauplii were then inoculated in triplicates into the fertilized and non-fertilized ponds, where they were cultured for
28 days at a density of 100 nauplii/litre. The results on
Artemia’s growth performance and nutritional composition
were significantly greater in fertilized ponds (p<0.05).
Phytoplankton communities were also more abundant in
fertilized ponds compared to non-fertilized ponds. All the
environmental parameters monitored were within the
recommended range for example the mean salinity was above
70ppt. The findings from this study suggested that pond
fertilization is of great importance for quality and optimal
production of Artemia in ponds. The results of this study lead
to the conclusion that Tanga cysts exhibit good biometric
characteristics as well as good growth performance when
exposed to pond fertilization. As a result, we recommend
further research in order to enhance more traits of the local
Artemia breed in pond production.The Western Indian Ocean Marine Science Association (WIOMSA
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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