Nimba - elements - Request for Proposal (RFP) Radio Novella Production

The origins and evolutionary relationships between the three main groups of amphibians are hotly debated. A molecular phylogeny based on rDNA analysis dating from 2005 suggests that salamanders and caecilians are more closely related to each other than they are to frogs and the divergence of the three groups took place in the Paleozoic or early Mesozoic before the breakup of the supercontinent Pangaea and soon after their divergence from the lobe-finned fishes . This would help account for the relative scarcity of amphibian fossils from the period before the groups split. [14] Another molecular phylogenetic analysis conducted about the same time concluded that lissamphibians first appeared about 330 million years ago and that the temnospondyl-origin hypothesis is more credible than other theories. The neobatrachians seemed to have originated in Africa/India, the salamanders in East Asia and the caecilians in tropical Pangaea. [15] Other researchers, while agreeing with the main thrust of this study, questioned the choice of calibration points used to synchronise the data. They proposed that the date of lissamphibian diversification should be placed in the Permian , rather less than 300 million years ago, a date in better agreement with the palaeontological data. [16] A further study in 2011 using both extinct and living taxa sampled for morphological, as well as molecular data, came to the conclusion that Lissamphibia is monophyletic and that it should be nested within Lepospondyli rather than within Temnospondyli . The study postulated that Lissamphibia originated no earlier than the late Carboniferous , some 290 to 305 million years ago. The split between Anura and Caudata was estimated as taking place 292 million years ago, rather later than most molecular studies suggest, with the caecilians splitting off 239 million years ago. [17]

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As to differences of style, regularities of form and tradition do occur such that it is possible to attribute particular African art objects to particular places, regions, or periods. Four distinct variables make this kind of stylistic identification possible. The first is geography, in that, all other things being equal, people in different places tend to make or do things in different ways. The second is technology, in that in some areas differences of style depend on the material employed. The third is individuality, in that an expert can identify the works of individual artists; inability to do so usually derives from a lack of familiarity. The fourth is institution, in that the creation of works of art takes place under the influence of the social and cultural institutions characteristic of any given location. But artifacts can be traded and then copied; artists themselves can travel; institutions, complete with associated artifacts, can move or spread from one area to another, sometimes because they are copied by a neighbouring people, sometimes because they are purchased, and sometimes as a result of conquest. The end result is a stylistic complexity in African art that defies easy classification. The names previously understood as referring to tribes can continue to be used, however, as convenient shorthand as long as it is realized that they do not all represent equivalent categories. One tribal name may refer to a group numbering no more than a few thousand; another may refer to the language spoken in a given area; yet another may describe an empire comprising peoples of distinct historical identities.

The lack of racial difference between the colonized and the colonizers allowed individuals to "pass" into the Americo-Liberian group. Institutions such as adoption, wardship, informal polygyny, and apprenticeship brought many indigenous children into settler homes. Within a generation, they had entered the Americo-Liberian group and forgotten their "tribal" origins. Another recognizable social group, the so-called civilized natives, consisted of those who had been educated and Christianized in mission schools while maintaining their indigenous identity. This group was often a vocal source of criticism of the settler elite.

Iron formations (IF) represent an iron-rich rock type that typifies many Archaean and Proterozoic supracrustal successions and are chemical archives of Precambrian ...

The skin of the eggplant contains valuable flavin and anthocyanin substances. Eggplant is a very good source of dietary fiber, vitamin B1, and copper, good source of manganese, vitamin B6, niacin (an anti-oxidant), potassium, folate, and vitamin K. Eggplant also contains phytonutrients such as nasunin and chlorogenic acid.

The Fouta Djallon also gives rise to numerous smaller rivers, including the Fatala, Konkouré , and Kolenté, which flow westward across the coastal plain to enter the Atlantic Ocean. The Forest Region generally drains to the southwest through Sierra Leone and Liberia. The Saint Paul River enters the Atlantic at Monrovia, in Liberia, and the Moa River has its mouth at Sulima, in Sierra Leone.

Butrint is an archaeological site that provides valuable evidence of ancient and medieval civilizations on the territory of modern Albania.

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