Evaluation of a simple tagging method to monitor the growth of endangered species of seahorse

Identification of an individual seahorse is important for captive breeding and conservation studies. A simple and cost-effective tagging method was devised to suit the rigid body structure and small fins of Hippocampus kuda. The first generation sexually matured individuals (452 numbers) were tagged using plastic strips tied around the neck. No significant differences (P > 0.05) in growth between the tagged and untagged groups were noted. All the tags persisted for one year without any perceptible changes in sexual and social behaviour

Species-specific proteins in closely-related seahorses

Non-denatured polyacrylanlide gel shows the respective species-specific characteristics on the muscle protein of' Hippocampus kuda and N. trirnacrtiahs. Two proteins; of molecular weight 66.8 and 39.8 kDa were found exclusively in 11. kuda. These constituted about 69.8 and 16.2% respectively of its protein. In M. trintucuirtus, two other specific proteins with molecular weight of 674.3 and 50.5 kDa were recorded, which constituted 46.0 and 7.5% respectively of its protein. These species-specific proteins are important for species identification, which paves avenues for further characterization and upgrading of the available information on seahorse taxonomy

Implementation of Physical Layer Key Distribution using Software Defined Radios

It was well known from Shannon’s days that characteristics of the physical channel like attenuation, fadingand noise can impair reliable communication. But it was more recently that the beneficial side effects of channelcharacteristics in ensuring secret communication started getting attention. Studies have been made to quantify theamount of secrecy that can be reaped by combining channel coding with security protocols. The Wiretap channelproposed by Wyner is arguably one of the oldest models of physical layer security protocols. In this paper, wepresent a brief tutorial introduction to the Wiretap channel, followed by an application of the physical layer modelto a class of Key Distribution protocols. We present results from an implementation of key distribution protocolsusing Software Defined Radio tools along with physical RF hardware peripherals. We believe this approach is muchmore tangible and informative than computer based simulation studies.Defence Science Journal, 2013, 63(1), pp.6-14, DOI:http://dx.doi.org/10.14429/dsj.63.375

Onset of sexual maturity in captivereared endangered Indian seahorse, Hippocampus kuda

The endangered Indian seahorse, Hippocampus kuda successfully reared in captive conditions for more than two years, repeatedly spawned and produced F2 generations. In F1 males, brood pouch started developingfrom 55 to 60 days of birth. The courtship behaviour was noted 30 days subsequently and males started receiving eggs in their pouch when their body length attained 101.0 ± 2.0 mm. Females started transferring eggs into the male brood pouch when their body length reached 110.0 ± 2.0 mm. The sexual maturity of male was earlier than that of female. Compared to the age (in days), the size was inferred as a reliable factor to predict the onset of maturity in this species

Captive Breeding and Nursery Rearing of the Indian Seahorse, Hippocampus kuda (Teleostei: Syngnathidae)

Breeding of laboratory-reared 21 pairs of broodstock Hippocampus kuda (Bleeker 1852) and rearing of their young ones indicated that 262.00 ± 59.00 offsprings were released during each spawning. A newly born seahorse was (mean ± SE) 7.83 ± 0.11 mm in length with a weight of 1.17 ± 0.009 mg. It could attain a mean length of 31.14 ± 0.66 mm with a mean weight of 16.13 ± 0.60 mg in 30 days when fed ad libitum with Artemia nauplii. The mean survival per brood cycle was enhanced to 65.22 ± 1.87% from almost less than 1.0% by improving the rearing conditions

Leisure and the Racing of National Populism

While leisure, race, and national populism have been minimally linked and theorized in the literature, we take this moment, during the global turn to national populism and conservative regimes, to center leisure and race in the politics of today. While theorizing the link to leisure and national populism, we center how the turn towards ethno-nationalist populism derives from the workings of race, alongside class, caste, and ethnicity, in various global north and global south leisure contexts. We provide an introduction that puts in conversation the realms of leisure (in all its possibilities), race, and the various modes of national populism. Therefore, we provide both the important theoretical foundations to understanding these relationships while offering numerous instances of such shifts to national populism. In particular, we start the conversation with a case of the realm of art, sport, and protest as a way to pull out the extraordinary links to social phenomenon, power, and theory

Amp\`ere-Class Pulsed Field Emission from Carbon-Nanotube Cathodes in a Radiofrequency Resonator

Pulsed field emission from cold carbon-nanotube cathodes placed in a radiofrequency resonant cavity was observed. The cathodes were located on the backplate of a conventional $1+\frac{1}{2}$-cell resonant cavity operating at 1.3-GHz and resulted in the production of bunch train with maximum average current close to 0.7 Amp\`ere. The measured Fowler-Nordheim characteristic, transverse emittance, and pulse duration are presented and, when possible, compared to numerical simulations. The implications of our results to high-average-current electron sources are briefly discussed.Comment: 5 pages, 6 figures; submitted to Applied Physics Letter