319 research outputs found
Dynamic and thermodynamic crossover scenarios in the Kob-Andersen mixture: Insights from multi-CPU and multi-GPU simulations
No full text<p>This dataset is associated with "Dynamic and thermodynamic crossover scenarios in the Kob-Andersen mixture: Insights from multi-CPU and multi-GPU simulations", Daniele Coslovich, Misaki Ozawa, and Walter Kob, Eur. Phys. J. E 62, 41 (2018) [<a href="https://doi.org/10.1140/epje/i2018-11671-2">doi:10.1140/epje/i2018-11671-2</a> <a href="https://arxiv.org/abs/1804.04559">arXiv:1804.04559</a>]</p>
<p>It includes scripts and data files to allow for the replication of the figures. EPS figures were generated using gnuplot version 5.0.</p>
<p>Notes:</p>
<ul>
<li>Small differences in the dynamic data for the N=3600 dataset obtained with the MD protocol reflect additional statistics gathered since acceptance of the paper.</li>
<li>Figure 6(b) in the published version of the manuscript was obtained using slightly incorrect values of the parameters J, T_0 entering equation 10. This minor issue has been fixed in this dataset.</li>
</ul>
Kobus kob
No full textKobus kob (Erxleben, 1777). Syst. Regn. Anim., 1:293. TYPE LOCALITY: Upper Guinea, towards Senegal. DISTRIBUTION: Senegal to W. Ethiopia and Sudan; N. Zaire to W. Kenya; N.W. Tanzania. ISIS NUMBER: 5301419009016002001.Published as part of James H. Honacki, Kenneth E. Kinman & James W. Koeppl, 1982, Order Artiodactyla, pp. 315-343 in Mammal Species of the World (1 st Edition), Lawrence, Kansas, USA :Alien Press, Inc. & The Association of Systematics Collections on page 336, DOI: 10.5281/zenodo.735297
Enrichment of rotifers (Branchionus plicatilis), Artemia nauplii and artificial dry feed with live yeast (Debaryomyces hansenii) for the growth of cultured dusky kob (Argyrosomus japonicus) larvae
No full textAquaculture has expanded dramatically over the last fifty years and now contributes almost half of the global total fish production. Since fish are a very important source of protein for humans, aquaculture is an important food source and economic practice. It is therefore important to minimise and manage any factors that may negatively impact on aquaculture operations. One of the major problems in marine fish aquaculture is the high rate of larval mortality in captivity. One way of combatting this problem is by improving overall health of larvae. Probiotics, especially yeasts, can be used as immune boosters, disease control agents and a source of additional nutrients to help minimise this problem. These probiotics can be effectively administered to larvae using live feeds, such as rotifers and Artemia, and formulated feeds. The dusky kob, Argryosomus japonicus, is emerging as a commercially viable marine aquaculture species in South Africa. However, commercial production of this species is being hindered by parasitic disease. Therefore, this study tested the efficacy of (1) incorporating live culturable Debaryomyces hansenii (yeast) cells into rotifers (Branchionus plicatilis), Artemia nauplii and a formulated feed (Nutroscience Pre-starter Crumble), and (2) investigated the effects of the probiotic supplemented feeds on growth and survival of dusky kob larvae. We demonstrated that live culturable yeast cells, incubated at a period of 0.5 hours, delivered significantly more yeast cells per rotifer than the longer incubation periods (p<0.001). For Artemia, the incubation period of 0.5 hours delivered more yeast cells per Artemia, but this incubation period was not significantly better than the longer incubation periods (p=0.204). The starting yeast concentration of 1 x 1012 yeast cells.ml-1 resulted in significantly more yeast cells per rotifer (p=0.042) and Artemia (p<0.001) than the lower starting yeast concentrations. The proliferation of Debaryomyces hansenii on the formulated (dry) feed is significantly higher at a storage temperature of 4 °C than it is at a storage temperature of 20 °C (p<0.001). This could however, be causing a deterioration in the stability of the feed. The number of yeast cells per g of feed significantly decreases after 14 days, indicating a possible loss of culturability and stability of the yeast in the feed, regardless of the storage temperature (p<0.001 for 4 °C; p<0.05 for 20 °C). Drying the feed after coating it in yeast also causes a significant reduction in the number of yeast cells per g of feed (p<0.001). With more replication and more cautionary experimental design, this experiment could be repeated in the future. Unfortunately, the mortality rate of the larvae was so high that the results obtained for the larval growth trials could not be statistically analysed, even though rotifer and Artemia (live feed) incubations were performed
Distribution. SE Sudan and W Ethiopia; occasional groups are seen in N Uganda. The divisions between the ranges of the White-eared Kob, Loder's Kob (K. loderi), and the Uganda Kob (K. thomasi) in Sudan are poorly understood. in Bovidae
No full textDistribution. SE Sudan and W Ethiopia; occasional groups are seen in N Uganda. The divisions between the ranges of the White-eared Kob, Loder's Kob (K. loderi), and the Uganda Kob (K. thomasi) in Sudan are poorly understood.Published as part of Don E. Wilson & Russell A. Mittermeier, 2011, Bovidae, pp. 444-779 in Handbook of the Mammals of the World – Volume 2 Hoofed Mammals, Barcelona :Lynx Edicions on page 635, DOI: 10.5281/zenodo.651248
Aging as dynamics in configuration space
No full textUsing molecular dynamics computer simulation we calculate for a simple
glass former eIS, the energy of the inherent structure,
in equilibrium and in the out-of-equilibrium situation. We show that
eIS can be used to define for the aging system an effective
time-dependent temperature T_{\ab e}(t). In particular we demonstrate that
during the aging process the system visits at time t configurations
which are typical for the equilibrium system at temperature T_{\ab e}(t)
A description of the early life history stages of the kob, Argyrosomus hololepidotus (Pisces: Sciaenidae), from southern Africa
No full textThe larval development of the kob, Argyrosomus hololepidotus is described and illustrated from a series of specimens collected in Algoa Bay, South Africa. Larvae are moderately deep bodies (BD = 30% BL) with a convex dorsal profile and trunk tapering to a narrow caudal peduncle. The head is large, increasing from 22% BL in preflexion larvae to 35% BL in juveniles. Pre-anal length increases from 37% BL in preflexion larvae to > 60% in juveniles. Notochord flexion occurs at 5-6 mm BL. Argyrosomus hololepidotus larvae are characterized by melanophores behind the head, at the anal fin base, on the caudal fin, on the abdomen, in the angle of the jaw and at the jaw isthmus. Medio-lateral pigmentation increases markedly in early juveniles. Osteological development is described from a series of cleared and stained specimens. By 14 mm BL all fins have the adult complement of spines and rays. The larvae of A. hololepidotus are briefly compared with those of other Atlantic and Indo-Pacific sciaenids
Kobus kob
No full textKobus kob (Erxleben, 1777). Syst. Regni Anim., 1:293. TYPE LOCALITY: Upper Guinea, towards Senegal. DISTRIBUTION: Senegal to W Ethiopia and Sudan; south to N Zaire, Uganda, W Kenya and NW Tanzania. Now extinct in Tanzania. SYNONYMS: adansoni, adenota, adolfi; adolfifriderici Schwarz, 1913; alurae, annulipes, bahrkeetae, buffonii, forfex, fraseri, kul, leucotis, loderi, neumanni, nigricans, nigroscapulatus; notatus Rothschild, 1913; pousarguesi, riparia, thomasi, ubangiensis, vaughani.Published as part of Peter Grubb, 1993, Order Artiodactyla, pp. 377-414 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 414, DOI: 10.5281/zenodo.735918
Dynamical heterogeneities below the glass transition
No full textWe present molecular dynamics simulations of a binary Lennard-Jones mixture at temperatures below the kinetic glass transition. The "mobility" of a particle is characterized by the amplitude of its fluctuation around its average position. The 5% particles with the largest/smallest mean amplitude are then defined as the relatively most mobile/immobile particles. We investigate for these 5% particles their spatial distribution and find them to be distributed very heterogeneously in that mobile as well as immobile particles form clusters. We suggest that this dynamic heterogeneity may be due to the fact that mobile/immobile particles are surrounded by fewer/more neighbors which form an effectively wider/narrower cage. The dependence of our results on the length of the simulation run indicates that individual particles have a characteristic mobility time scale which can be approximated via the non-Gaussian parameter. (C) 2002 American Institute of Physics
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