scholarly journals Characterization of the sand particle size from natural habitat and the digestive tract, as a basis in determining the grain size of sand suitable for a substrate of sea cucumber (Holothuria scabra) culture semiclosed system

2021 ◽  
Vol 718 (1) ◽  
pp. 012058
Author(s):  
K Sabilu ◽  
E Supriyono ◽  
K Nirmala ◽  
D Jusadi ◽  
Widanarni
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Digestive Tract ◽  
Sea Cucumber ◽  
Natural Habitat ◽  
Sand Particle ◽  
Holothuria Scabra

Influence of sand grain size and nest microenvironment on incubation success, hatchling morphology and locomotion performance of green turtles (Chelonia mydas) at the Chagar Hutang Turtle Sanctuary, Redang Island, Malaysia

2018 ◽  
Vol 66 (6) ◽  
pp. 356 ◽  
Author(s):  
Taylor A. Stewart ◽  
David T. Booth ◽  
Mohd Uzair Rusli
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Swimming Speed ◽  
Green Turtle ◽  
Chelonia Mydas ◽  
Sand Particle ◽  
Emergence Success ◽  
Sand Grain Size

The nest microenvironment affects hatching and emergence success, sex ratios, morphology, and locomotion performance of hatchling sea turtles. Sand grain size is hypothesised to influence the nest microenvironment, but the influence of sand grain size on incubation of sea turtle eggs has rarely been experimentally tested. At the Chagar Hutang Turtle Sanctuary, Redang Island, Malaysia, green turtle (Chelonia mydas) nests were relocated to sands with different sand grain sizes on a natural beach to assess whether grain size affects nest temperature, oxygen partial pressure inside the nest, incubation success, hatchling morphology and hatchling locomotion performance. Green turtle nests in coarse sand were cooler; however, hatching success, nest emergence success, oxygen partial pressure, incubation length and hatchling size were not influenced by sand particle size. Nests in medium-grained sands were warmest, and hatchlings from these nests were better self-righters but poorer crawlers and swimmers. Hatchling self-righting ability was not correlated with crawling speed or swimming speed, but crawling speed was correlated with swimming speed, with hatchlings typically swimming 1.5–2 times faster than they crawled. Hence, we found that sand particle size had minimal influence on the nest microenvironment and hatchling outcomes.

Characterization of proteases from the digestive tract of sea cucumber (Stichopus japonicus): High alkaline protease activity

Aquaculture ◽  
2005 ◽  
Vol 246 (1-4) ◽  
pp. 321-329 ◽  
Author(s):  
Xue-yan Fu ◽  
Chang-hu Xue ◽  
Ben-chun Miao ◽  
Zhao-jie Li ◽  
Xin Gao ◽  
...  
Keyword(s):  
Digestive Tract ◽  
Alkaline Protease ◽  
Protease Activity ◽  
Sea Cucumber ◽  
Stichopus Japonicus

scholarly journals Extraction and Characterization of Collagen from Sand Sea Cucumber (Holothuria scabra)

2021 ◽  
Vol 26 (3) ◽  
pp. 319-327
Author(s):  
Gita Syahputra ◽  
Hariyatun Hariyatun ◽  
Muhammad Firdaus ◽  
Pugoh Santoso
Keyword(s):  
Molecular Weight ◽  
Sea Cucumber ◽  
Type I ◽  
Indonesian Seas ◽  
Holothuria Scabra ◽  
Aquatic Product ◽  
Electron Microscopy Analysis ◽  
Main Component ◽  
Almost All

Sand sea cucumber (Holothuria scabra) is an aquatic product that belongs to Echinodermata, a habitant in almost all Indonesian seas. The main component of the sea cucumber is protein, one of which is collagen. This study aimed to extract and characterize collagen from the species using the acid-base extraction method. The characterization of sea cucumber collagen includes molecular weight, amino acid components, Fourier transform infrared spectrophotometry, and scanning electron microscopy analysis. This study has successfully extracted collagen from the sample using an extraction system: NaOH 0.1 M; CH3COOH 0.1 M; and distilled water under 45°C treatments, gave 6% yield. The collagen has a molecular weight 110-130 kDa. Based on the infrared spectra, the specific functional groups of the collagen are amide A (3379.29 cm-1), amide B (2924.09 cm-1), amide I (1681.93 cm-1), amide II (1560.41 cm-1), and amide III (1249.87 cm-1). The collagen falls into type I. We suggest an alternative resource of collagen from sand sea cucumber, other than poultry and mammals.   Keywords: characterization, collagen, extraction, fishery, sand sea cucumber

Effects of Sand Particle Size and Gradation on Strength of Reactive Powder Concrete

2011 ◽  
Vol 261-263 ◽  
pp. 208-211 ◽  
Author(s):  
Tao Ji ◽  
Bao Chun Chen ◽  
Yi Zhou Zhuang ◽  
Feng Li ◽  
Zhi Bin Huang ◽  
...  
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Strength Test ◽  
Reactive Powder Concrete ◽  
Sand Particle ◽  
Particle Sizes ◽  
Test Results ◽  
Sand Mixture ◽  
Different Types ◽  
Reactive Powder

After modification, Toufar model was used to calculate the packing degrees of sand mixtures with different particle sizes. For four gradations of sands, the weight ratios of different types of sands with different size ranges, which achieve maximum packing degrees, have been obtained using the modified Toufar model. A strength test of reactive powder concretes (RPCs) with the four gradations of sands was reported. The test results show that the strength of RPC is related to both the maximum grain size and the packing degree of sand mixture. The smaller maximum grain size and larger packing degree of sand mixture can achieve the higher strength of RPC.

scholarly journals Mechanical Characterization of Cryomilled Al Powder Consolidated by High-Frequency Induction Heat Sintering

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Ehab A. El-Danaf ◽  
Mahmoud S. Soliman ◽  
Abdulhakim A. Almajid ◽  
Khalil Abdelrazek Khalil
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
High Frequency ◽  
X Ray Diffraction ◽  
Induction Heat ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Thermal Stability Of ◽  
High Frequency Induction

In the present investigation, an aluminum powder of 99.7% purity with particle size of ~45 µm was cryomilled for 7 hours. The produced powder as characterized by scanning, transmission electron microscopy, and X-ray diffraction gave a particle size of ~1 µm and grain (crystallite) size of23±6 nm. This powder, after degassing process, was consolidated using high-frequency induction heat sintering (HFIHS) at various temperatures for short periods of time of 1 to 3 minutes. The present sintering conditions resulted in solid compact with nanoscale grain size (<100 nm) and high compact density. The mechanical properties of a sample sintered at 773 K for 3 minutes gave a compressive yield and ultimate strength of 270 and 390 MPa, respectively. The thermal stability of grain size nanostructured compacts is in agreement with the kinetics models based on the thermodynamics effects.

Characterization of TRH/GnRH-like peptides in the sea cucumber, Holothuria scabra, and their effects on oocyte maturation

Aquaculture ◽  
2020 ◽  
Vol 518 ◽  
pp. 734814
Author(s):  
Arada Chaiyamoon ◽  
Ruchanok Tinikul ◽  
Nittiya Nontunha ◽  
Supakant Chaichotranunt ◽  
Tanes Poomtong ◽  
...  
Keyword(s):  
Oocyte Maturation ◽  
Sea Cucumber ◽  
Holothuria Scabra

Cryomilling and Characterization of Ti/Al2O3 Powders

2018 ◽  
Vol 281 ◽  
pp. 285-290
Author(s):  
Jun Yan Wu ◽  
Qian Liu ◽  
Zhi Hao Wang ◽  
Zhi Wang
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Grain Size ◽  
Liquid Nitrogen ◽  
Room Temperature ◽  
Particle Size Analyzer ◽  
Distribution Phase ◽  
Xrd And Tem ◽  
Milled Powders

In order to prevent the oxidation of Ti, which ultimately leads to the generation of intermetallic compound Ti3Al, a new method of cryomill in liquid nitrogen was used to deal with the Ti/Al2O3 powders. The size distribution, phase composite and microstructure of the powders were analyzed using laser particle size analyzer, XRD, and TEM, respectively. Then, the performances of Ti/Al2O3 cermet sintered using cryomilled powders and room temperature milled powders were compared. The results show that, with the increase of cryomilling time, the grain size decreases shapely and high reactivitive nanoscale powders are finally obtained. With the cryomilling in liquid nitrogen, the Ti-N bonds are formed, which successfully prevent the oxidation of Ti. Ti/Al2O3 cermet sintered using cryomilled powders shows higher density, better mechanical properties than that using RT milled powders.

scholarly journals Stochastic modeling of kaolinite transport through a sand filter

2019 ◽  
Vol 56 (11) ◽  
pp. 1573-1583 ◽  
Author(s):  
Jongmuk Won ◽  
Susan E. Burns
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Porous Media ◽  
Clay Particle ◽  
Coarse Grained ◽  
Sand Particle ◽  
Soil Matrix ◽  
Clay Particles ◽  
Grain Size Distributions ◽  
Coarse Grained Soil

Accurately modeling the transport of clay particles through coarse-grained porous media is essential to engineering applications ranging from filtration and drainage, groundwater flow modeling, to contaminant transport. However, predicting the retention and clogging behavior of clay particles within a coarse-grained soil matrix is extremely challenging because clay particles can aggregate and form clusters with a variety of fabrics depending on the prevailing geochemistry of the pore fluid (i.e., pH and ionic strength). The work performed in this study developed a stochastic model to investigate the uncertainty of clay particle transport in porous media using random sampling at a given grain-size distribution to account for inherent uncertainty of the size of clay clusters being transported. Results demonstrated that the model proposed in this work can evaluate upper and lower boundaries of retention profiles of clay particles in a sand medium at given mean and standard deviation of grain-size distributions. In addition, the deterministic approach (using median sizes of sand and clay particles in the simulation) underestimated the mass of retained particles at small size ratios of clay particle size/sand particle size when compared with the stochastic prediction, which would result in nonconservative design.

scholarly journals Isolation and characterization of polymorphic microsatellite loci in the sea cucumber Holothuria scabra

2015 ◽  
Vol 14 (2) ◽  
pp. 6529-6532 ◽  
Author(s):  
Z.B. Li ◽  
G. Dai ◽  
J.B. Shangguan ◽  
Y.F. Ning ◽  
Y.Y. Li ◽  
...  
Keyword(s):  
Microsatellite Loci ◽  
Sea Cucumber ◽  
Holothuria Scabra ◽  
Isolation And Characterization ◽  
Polymorphic Microsatellite

Characterization of Atmosphere PM2.5 and Dustfall in Xining (China)

2013 ◽  
Vol 562-565 ◽  
pp. 1422-1427 ◽  
Author(s):  
Jun Tang ◽  
Fa Qin Dong ◽  
Qun Wei Dai ◽  
Yue Quan Deng
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Elemental Composition ◽  
Size Distribution ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Mineral Phase ◽  
Three Samples ◽  
Particle Size Analyzer

In this paper, mineral phase, elemental composition and size distribution were analysed by means of XRD, XRF and laser particle size analyzer respectively. According to the results of XRD, quartz, illite, calcite and albite were all found in three samples; Dolomite was found only in dustfall; Clinochlore was existed in both PM2.5 and soil. From the results of XRF, elemental compositon of three samples were focused on elemental Na, Si, Al, S, Ca, Fe, Mg, K. Based on the grain size analysis, the size distribution of dustfall mainly ranges from 1µm to 40µm.

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