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Holothuria
About: Holothuria is a research topic. Over the lifetime, 362 publications have been published within this topic receiving 4982 citations.
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TL;DR: Results of this research showed stimulation of fission with 1 fission plane is faster than 2 fissions plane and 3 fission planes for the supply of seed in sea cucumber Holothuria fission reproduction impatiens andHolothuria atra.
Abstract: Natural production of sea cucumbers in decline, it is because of overfishing and use without any attempt for cultivation. There are several ways for the provision of seeds, one with a reproduction. Sea cucumbers can reproduce sexually and asexually. Sexual reproduction involves the sea cucumber sperm and egg cells, and that asexual reproduction through fission technique. Fission is the process of cleavage of the specimen the anterior, middle and posterior to the sea cucumber. The third part will grow into new individuals after each specimen was able to grow the missing part. The research was conducted on April-June 2012 at Bandengan, Jepara with the aim of analyzing the ability of the sea cucumber Holothuria fission reproduction impatiens and Holothuria atra and observe individual performance and survival of fission results from the fission through the stimulation of 1, 2, and 3 fission plane in sea cucumber Holothuria atra and Holothuria impatiens for the supply of seed. The method used was field experimental research. The results of this research showed stimulation of fission with 1 fission plane is faster than 2 fission plane and 3 fission plane. H. atra to fission faster than H. impatiens. On the stimulation of 2 fission plane, the anterior fission faster than the middle or posterior. The results of regeneration of the species H. impatiens are not able to regenerate. The posterior regenerate faster than the anterior and middle. The posterior regenerate faster than the anterior and middle. In general, sea cucumbers which were going through the stimulation of fission stage, wound closure phase, the stage of regeneration, which in turn will form the mouth and anus on the part of the divide.
4 citations
Book Chapter•
01 Jan 1979
4 citations
TL;DR: Gene organization and sequence features indicate that the two Holothuria genes are the equivalents of a known pair of late H2B and H4 genes which have been described in the genome of sea urchins.
Abstract: A genomic library of the sea cucumber Holothuria tubulosa was screened with human and murine histone gene hybridization probes. A recombinant phage carrying an H4 gene was isolated and sequenced. Hybridization analysis of the entire 20 kb phage insert with probes for H1, H2A, H2B and H3 histones was negative except for H2B. This solitary arrangement of the two neighbouring histone H4 and H2B genes is in contrast to the organization of ‘cleavage stage’ histone genes, which are arranged in tandem quintets of genes encoding the 5 histone classes. Gene organization and sequence features indicate that the two Holothuria genes are the equivalents of a known pair of late H2B and H4 genes which have been described in the genome of sea urchins. This result shows that the simultaneous occurrence of tandem repeats of histone gene quintets and smaller groups of structurally distinct histone gene subtypes is not unique for sea urchins, but also applies to other echinodermata, such as the sea cucumber Holothuria tubulosa.
4 citations
TL;DR: The spatial distribution of H. (Stauropora) fuscocinerea in the study area is a product of its selective feeding activity, evidencing the preliminary importance of the species in the trophic dynamics of La Entrega reef.
Abstract: Introduction: The importance of holothuroids in marine ecosystems is related to their feeding activities, which have been little studied in the eastern Pacific. Objective: To describe the feeding habits of the sea cucumber Holothuria (Stauropora) fuscocinerea and their bioturbation potential in La Entrega reef, Mexico. Methods: The population size of H. (Stauropora) fuscocinerea was determined by means of four 20 x 4 m (320 m2) band transects, while the available sediment for the sea cucumbers and their feces were characterized in three stations (A-C) via granulometry and quantification of organic carbon and organic matter. Excretion rate was determined every 4 hr over a 24 hr period and the relationship between sea cucumber length and biomass and the excretion rate evaluated. Results: According to non-parametric permutation, ordination and percentage similarity analyses, sea cucumber feces mostly comprised a large proportion of small grains compared to the available sediment, indicating that H. (Stauropora) fuscocinerea is selective on grain size. Preliminary bioturbation potential of the species may reach up to 8.71 ± 0.17 kg day of sediment in the study area. Conclusion: The spatial distribution of H. (Stauropora) fuscocinerea in the study area is a product of its selective feeding activity, evidencing the preliminary importance of the species in the trophic dynamics of La Entrega reef.
4 citations
TL;DR: A new triterpene glycoside, hillaside C, was isolated from the sea cucumber Holothuria hilla Lesson, and its structure has been elucidated by spectral analysis (ESI-MS and NMR) and chemical transformations.
Abstract: A new triterpene glycoside, hillaside C (1), was isolated from the sea cucumber Holothuria hilla Lesson, which is found in the South China Sea, and its structure has been elucidated by spectral analysis (ESI-MS and NMR) and chemical transformations. Four known compounds, holothuria A, thymine, uracil, and cholesterol, were also obtained. Compound 1 exhibited significant cytotoxicity against eight human tumor cell lines (A-549, MCF-7, IA9, CAKI-1, PC-3, KB, KB-VIN, and HCT-8) with IC50 values in the range of 0.15-3.20 microg/ml.
4 citations