Results 91 to 100 of about 3,591 (200)
The invertebrate Caenorhabditis elegans biosynthesizes ascorbate. [PDF]
, 2015 l-Ascorbate, commonly known as vitamin C, serves as an antioxidant and cofactor essential for many biological processes. Distinct ascorbate biosynthetic pathways have been established for animals and plants, but little is known about the presence or ...
Adler, Lital N +5 more
core +2 more sources
On the liver tissue of freshwater stingrays and balloonfish.
NIPPON SUISAN GAKKAISHI, 1985 Using the freshwater stingrays Potamotrygon spp. and the balloonfish Diodon holacanthus, an investigation was carried out on the liver size and the amount of fat droplets in hepatocytes and the following results were obtained. The liver of the stingrays was relatively small in size among Chondrichthyes and the value of hepatosomatic index (HSI) on six ...
openaire +2 more sources
The Yellow Stingray, Urobatis jamaicensis (Chondrichthyes Urotrygonidae): A Synoptic Review [PDF]
, 2013 The yellow stingray, Urobatis jamaicensis (Cuvier) has been the subject of a multitude of diverse studies on its natural history, morphology, and physiology. We have attempted here to briefly review all the studies on U.
Fahy, Daniel P. +4 more
core +2 more sources
A new species of freshwater stingray (Myliobatiformes: Potamotrygoninae) from northern South America
Neotropical IchthyologyA new species of freshwater stingray (Potamotrygoninae) is described from the Demerara River, Guyana and río Guanare, Venezuela. It is distinguished from all other regional congeneric taxa (i.e., Potamotrygon marinae, P. schroederi, P.
Devya Hemraj-Naraine +5 more
doaj +1 more source
Resolving Species: Urobatis halleri, U. concentricus, and U. maculatus as Subspecies [PDF]
, 2012 Hybridization is the interbreeding of separate species to create a novel species (hybrid). It is important to the study of evolution because it complicates the biological species concept proposed by Ernst Mayr (1963), which is widely adopted in biology ...
Heffernan, Scott
core +2 more sources
Frontiers in Physiology, 2013 Himantura signifer is a freshwater stingray which inhabits rivers in Southeast Asia. It can survive in brackish water but not seawater. In brackish water, it becomes partially ureosmotic, but how it maintains its plasma hypoionic to the external medium ...
Yuen K Ip +9 more
doaj +1 more source
Genetics and Molecular Biology, 2008 DNA barcoding is a recently proposed global standard in taxonomy based on DNA sequences. The two main goals of DNA barcoding methodology are assignment of specimens to a species and discovery of new species.
Daniel Toffoli +5 more
doaj +1 more source
Records of predatory, con-specific and human induced mauls on fish from the Northeast Atlantic and Black Sea [PDF]
, 2015 Present study aims to describe records of mauled and con-specific injures in various fish inhabiting different environment and to discuss possible impacts on fish behavior and ontogenesis.
Barreiros, João P., Raykov, Violin S.
core
Success stories and emerging themes in conservation physiology [PDF]
, 2016 The potential benefits of physiology for conservation are well established and include greater specificity of management techniques, determination of cause–effect relationships, increased sensitivity of health and disturbance monitoring and greater ...
Cooke, Steven J. +11 more
core +6 more sources
Neotropical IchthyologyThis comparative study of gill morphometrics in near-term embryos of freshwater stingray potamotrygonids examines gill dimensions in relation to neonatal lifestyle and habitat.
Wallice Paxiúba Duncan +2 more
doaj +1 more source