نتایج جستجو برای: chitin crab shells
تعداد نتایج: 28360 فیلتر نتایج به سال:
Abstract. Luthfiyana N, Bija S, Anwar E, Laksmitawati DE, Risalinda GL. 2022. Characteristics and activity of chitosan from mud crab shells on acne bacteria: Staphylococcus aureus, S. epidermidis Propionibacterium acnes. Biodiversitas 23: 6645-6651. Chitosan is a product chitin deacetylation, which has the potential to act as bacteria. The study aimed determine characteristics bacteria, i.e., a...
Thailand is one of the major producers and exporters of shrimp and other marine products worldwide. Over 600,000 metric tons of marine products containing chitinous materials, shrimp, crab and squid, are produced yearly, which resulted in abundant amount of raw materials for the production of chitin-chitosan. Chitin-chitosan industry in Thailand has grown considerably in the past decade. Howeve...
Abstract Marine Vibrio species are natural degraders of chitin and usually secrete high levels chitinolytic enzymes to digest recalcitrant chitooligosaccharides. This study used an endochitinase ( Vh ChiA) from campbellii produce high-quality chitobiose crustacean chitins. The enzyme was shown be fully active stable over 24 h when BSA as additive. When different sources were tested, ChiA prefer...
Natural resources have been traditionally used in agriculture by humans. For example, crab and shrimp shell powder has been applied to control crop disease and improve soil fertility (Ha and Huang, 2007). On the other hand, chitin is an important structural component in fungal cell walls and can be degraded by plant chitinases to eradicate fungal infection (Grover, 2012). Plant cells can recogn...
A chitinase antigen has been identified in Pseudomonas aeruginosa strain 385 using sera from animals immunized with a whole-cell vaccine. The majority of the activity was shown to be in the cytoplasm, with some activity in the membrane fraction. The chitinase was not secreted into the culture medium. Purification of the enzyme was achieved by exploiting its binding to crab shell chitin. The pur...
Nacre, the iridescent material found in pearls and shells of molluscs, is formed through an extraordinary process of matrix-assisted biomineralization. Despite recent advances, many aspects of the biomineralization process and its evolutionary origin remain unknown. The pearl oyster Pinctada fucata martensii is a well-known master of biomineralization, but the molecular mechanisms that underlie...
Micromechanical properties and structural characterization of modern inarticulated brachiopod shells
[1] We investigated micromechanical properties and ultrastructure of the shells of the modern brachiopod species Lingula anatina, Discinisca laevis, and Discradisca stella with scanning electron microscopy (SEM, EDX), transmission electron microscopy (TEM) and Vickers microhardness indentation analyses. The shells are composed of two distinct layers, an outer primary layer and an inner secondar...
The relationship between crab size and shell size selected, in a free-choice situation, was tested for crabs maintained under several conditions . Individuals of Calcinus tibicen that were held and presented with an excess of shells for 7 days prior to testing selected smaller shells than control crabs (either those maintained for 7 days with no excess shells available or those experiencing nat...
Four Chitin degrading bacterial strains vibrio aestuarianus, Flavobacterium, Shewenella and Exiguobacterium were isolated from crustacean shells. The strains were confirmed by Biochemical analysis, FAME-GC analysis and 16s rDNA sequencing. The chitinase was purified by a two step chromatographic method and characterized. The enzyme was purified to homogeneity by 6.75 fold with 46% recovery afte...
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