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T. Subramoniam - One of the best experts on this subject based on the ideXlab platform.

  • larval development in the sand crab Emerita emeritus l 1767 anomura hippoidea reared in the laboratory
    Crustaceana, 2006
    Co-Authors: S Israel, T. Subramoniam, T Murugan, V P Venugopalan, M Munuswamy, G Van Der Velde
    Abstract:

    [Larval stages of the intertidal anomuran sand crab, Emerita emeritus (L., 1767) were reared in the laboratory up to the megalopa stage under conditions of 32‰ salinity, 25-27°C and a 12 : 12 hours light : dark cycle. A total of six zoeal stages and a megalopa stage were recorded with the average duration of development being 29 days. Zoeae fed on a diet containing Artemia nauplii showed better survival as compared to those fed on an algal diet. The laboratory reared larvae of E. emeritus are compared with earlier reports of larval stages in the Hippidae, both from plankton collections and laboratory reared specimens. Variations in larval morphology among various species of Emerita from the plankton as against laboratory reared larvae are discussed. Les stades larvaires du crabe des sables anomoure, Emerita emeritus (L., 1767) ont ete eleves en laboratoire jusqu'au stade megalope dans les conditions suivantes: 32‰ de salinite, 25-27°C et un cycle journalier d'eclairement 12 : 12. Un total de 6 stades zoes et un stade megalope ont ete notes avec une duree de developpement moyenne de 29 jours. Les zoes nourries avec un regime contenant des nauplius d' Artemia montrent une meilleure survie que celles nourries avec un regime d'algues. Les larves de E. emeritus elevees en laboratoire ont ete comparees avec les descriptions anterieures des stades larvaires des Hippidae, provenant de collectes planctoniques et des specimens eleves en laboratoire. Les variations dans la morphologie larvaire entre les differentes especes d' Emerita provenant du plancton ou obtenues en laboratoire sont discutees. , Larval stages of the intertidal anomuran sand crab, Emerita emeritus (L., 1767) were reared in the laboratory up to the megalopa stage under conditions of 32‰ salinity, 25-27°C and a 12 : 12 hours light : dark cycle. A total of six zoeal stages and a megalopa stage were recorded with the average duration of development being 29 days. Zoeae fed on a diet containing Artemia nauplii showed better survival as compared to those fed on an algal diet. The laboratory reared larvae of E. emeritus are compared with earlier reports of larval stages in the Hippidae, both from plankton collections and laboratory reared specimens. Variations in larval morphology among various species of Emerita from the plankton as against laboratory reared larvae are discussed. Les stades larvaires du crabe des sables anomoure, Emerita emeritus (L., 1767) ont ete eleves en laboratoire jusqu'au stade megalope dans les conditions suivantes: 32‰ de salinite, 25-27°C et un cycle journalier d'eclairement 12 : 12. Un total de 6 stades zoes et un stade megalope ont ete notes avec une duree de developpement moyenne de 29 jours. Les zoes nourries avec un regime contenant des nauplius d' Artemia montrent une meilleure survie que celles nourries avec un regime d'algues. Les larves de E. emeritus elevees en laboratoire ont ete comparees avec les descriptions anterieures des stades larvaires des Hippidae, provenant de collectes planctoniques et des specimens eleves en laboratoire. Les variations dans la morphologie larvaire entre les differentes especes d' Emerita provenant du plancton ou obtenues en laboratoire sont discutees. ]

  • breeding biology of the intertidal sand crab Emerita decapoda anomura
    Advances in Marine Biology, 2003
    Co-Authors: T. Subramoniam, V Gunamalai
    Abstract:

    Abstract Emerita is a burrowing mole crab or sand crab, adapted to life in wave-washed sandy beaches of temperate and tropical seas. The reproductive biology of this anomuran crab presents several peculiarities, all contributing to its adaptation to this harsh environmental niche. We discuss the following aspects: I) sex ratio and size at sexual maturity, 2) neoteny and protandric hermaphroditism, 3) mating behaviour and sperm transfer strategy, 4) synchronisation of moulting and reproduction, S) environmental impact on reproductive cycle and egg production, 6) biochemistry of yolk utilisation and energetics, 7) larval development, dispersal and settlement and 8) the value of Emerita as indicator species. These aspects are discussed in the light of the life history pattern, comprising a sedentary adult and pelagic larval phases. The successful colonisation of the physically challenging habitat of the sandy beach by Emerita is attributable largely to reproductive strategy and the larval developmental and recruitment pattern. Sensitivity to changing environmental conditions, including pollution, make this intertidal crab an indicator species for monitoring anthropogenic impact.

  • Carbohydrate components of lipovitellin of the sand crab Emerita asiatica.
    Molecular reproduction and development, 2000
    Co-Authors: R. Tirumalai, T. Subramoniam
    Abstract:

    Lipovitellin II (Lv II), the major yolk protein of the anomuran crab Emerita asiatica, was purified using heparin-sepharose affinity column chromatography. The purified Lv II was a glycoprotein as it was stainable with periodic acid-Schiff's reagent. Quantitative analysis of sugars showed the presence of fucose, mannose, galactosamine, N-linked oligosaccharides, as well as O-linked oligosaccharides containing N-acetyl hexosamine as the terminal residue. The amount of N-linked oligosaccharides is higher than that of the O-linked oligosaccharides. Biogel P-4 column chromatographic separation of the radiolabeled oligosaccharides of Lv II showed the presence of five different O-linked oligosaccharides and four different N-linked oligosaccharide species. HPTLC separation of the neoglycolipids prepared from the O-linked oligosaccharides also showed the presence of five different O-linked oligosaccharide species. N-linked oligosaccharides contain significant quantities of mannose. Unisil column chromatographic purification in conjunction with HPTLC separation revealed three neutral glycolipid species such as monoglycosylceramide, diglycosylceramide, and triglycosylceramide in the Lv II. The functional significance of these carbohydrate components of the major yolk protein during embryogenesis of the sand crab is discussed.

Jan Bruner - One of the best experts on this subject based on the ideXlab platform.

Manuel Ramírez Sánchez - One of the best experts on this subject based on the ideXlab platform.

  • Catálogo de inscripciones votivas de Augusta Emerita
    E-pigraphia, 2021
    Co-Authors: Manuel Ramírez Sánchez
    Abstract:

    La epigrafía latina de la ciudad romana de Augusta Emerita cuenta con un nuevo catálogo, que acaba de publicar el Museo Nacional de Arte Romano, la Asociación de Amigos del Museo y la Fundación de Estudios Romanos en la colección Cuadernos emeritenses, que con esta nueva obra alcanza su número 45.  Nos referimos al Catálogo de inscripciones votivas de Augusta Emerita realizado por José Luis Ramírez Sádaba, Catedrático de Historia Antigua de la Universidad de Cantabria que, pese a haberse jubi..

  • Nueva Epigrafía funeraria de Augusta Emerita (NEFAE)
    E-pigraphia, 2020
    Co-Authors: Manuel Ramírez Sánchez
    Abstract:

    El Consorcio de la Ciudad Monumental Histórica-Artística y Arqueológica de Mérida, a través del Departamento Editorial de la Diputación de Badajoz, ha publicado el primer volumen de su serie Memoria. Monografías arqueológicas de Mérida que, con el título Nueva Epigrafía funeraria de Augusta Emerita (ss. I-VII) y su contexto arqueológico contribuye a seguir aumentando el repertorio de publicaciones científicas sobre esta ciudad romana que fue capital de la Lusitania. Los autores de esta monogr..

Matias J Cafaro - One of the best experts on this subject based on the ideXlab platform.

Liu Gang - One of the best experts on this subject based on the ideXlab platform.