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Vol 4 Issue 1

Volume  4  Issue  1

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Amoussou T. Olivier, Toguyeni Aboubacar, Imorou Toko Ibrahim, Chikou Antoine and Youssao Abdou Karim Issaka

Analysis of Morphological Parameters of Wild Populations of Oreochromis niloticus (Linnaeus, 1758) of the Three Hydrographic Basins of Southern Benin

[Abstract] [Full-Text PDF] [html]

Abstract: The morphological characteristics of a fish species are under the dual influence of environmental and genetic factors. This study aims to identify the local populations of Oreochromis niloticus to use in Beninese fish farming. Individuals of this tilapia species were collected from nine sampling sites of the main waterways of Southern Benin. The morphological parameters of these individuals were analysed in relation with their waterway of origin, hydrobiological sampling period and sex. The body weight, total length, standard length and interorbital width were on one hand significantly higher among individuals sampled at Ouémé River than those of Couffo River and on the other hand higher in these 2 waterways than Lake Toho. The head length, body height, prepectoral length, dorsal-fin base length, caudal peduncle height and the dorso-anal length were significantly higher among individuals of Couffo River than those of Ouémé River. The majority of the sampled fish had a size ranged from 10 to 15 cm with 53.15%, 49.29% and 68.60% respectively for individuals from Ouémé River, Lake Toho and Couffo River. Among males from Ouémé River, Couffo River and females of Lake Toho and Couffo River, the relative growth was allometric. The growth of males from Lake Toho and females from Ouémé River was isometric. At both sexes, the condition factor varied from 1.60±0.36 to 1.91±0.53 and 1.56±0.30 to 2.11±1.86 respectively. Two populations are observed: one grouping individuals from Ouémé River, and the second one grouping those of Couffo River and Lake Toho.

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Valentowitsch, Johann

Exposing Moore’s Law as an Innovation Myth

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Abstract: Practitioners often claim that Moore’s Law guided innovation efforts of the whole semiconductor industry for more than four decades. Providing a road map for long range planning Moore’s Law has been said to determine research and development activities of microelectronic manufacturers and suppliers. However, the question whether Moore’s forecast was in fact a self-fulfilling prophecy has never been empirically addressed. The present study aims to close this research gap applying Granger causality testing. Research findings clearly show that Moore’s predictions do not Granger cause actual transistor counts exposing, thus, Moore’s Law as a myth.

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Refai, H.; Badawy, M. ; Hassan, A. ; Sakr, H and Baraka, Y.

Antimicrobial Effect of Biologically Prepared Silver Nanoparticles (AgNPs) on Two Different Obturator’s Soft Linings in Maxillectomy Patients

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Abstract: The aim of the present work was to evaluate the efficiency of locally biologically-prepared silver nanoparticles in decontamination of obturator’s soft linings in maxillectomy patients. Samples of oral washes that were collected from patients were contaminated predominantly with Candida albicans (80%) and Staphylococcus aureus (100%) with a mean count of 3.7 X103±3.0 for Candida albicans and 3X104±4.5 for Staphylococcus aureus. The usage of tap water in obturators cleaning did not remove all Candida albicans or Staphylococcus aureus. The inhibitory effect of the silver nanoparticles on the growth of Candida albicans and Staphylococcus aureus was proved and supplied to every patient in a concentration of 600 μg/ml in bottles of 50 ml. Application of AgNPs on the first lining (Mollosil) prolonged its durability with minimal complaint in the patient defect. All patients using the second lining (Multisil) decontaminated with AgNPs continued without any complaint. It was concluded that, the preferable protocol for construction of definitive obturators for maxillectomy patients is to use flexible acrylic frames with soft liners in a mechanically detachable 2 piece obturator system, starting with a moderate bulb soft lining as (Mollosil), followed by a firmer soft liner as (Multisil), combined with decontamination of the linings by an antimicrobial agent as (AgNPs).

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