ANCIENT DNA FROM HUNTER-GATHERER AND FARMER GROUPS FROM NORTHERN SPAIN SUPPORTS A RANDOM DISPERSION MODEL FOR THE NEOLITHIC EXPANSION INTO EUROPE.

Ancient DNA from hunter-gatherer and farmer groups from Northern Spain supports a random dispersion model for the Neolithic expansion into Europe.

BACKGROUND/PRINCIPAL FINDINGS: The phenomenon of Neolithisation refers to the transition of prehistoric populations from a hunter-gatherer to an agro-pastoralist lifestyle.Traditionally, the spread of an agro-pastoralist economy into Europe has been framed within a dichotomy based either on an acculturation phenomenon or on a demic diffusion.Howeve

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Ammonia Affects Astroglial Proliferation in Culture.

Primary cultures of rat astroglial cells were exposed to 1, Eksemcreme 3 and 5 mM NH4Cl for up to 10 days.Dose- and time-dependent reductions in cell numbers were seen, plus an increase in the proportion of cells in the S phase.The DNA content was reduced in the treated cells, and BrdU incorporation diminished.However, neither ammonia nor ammonia p

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Limited impact of passive non-neutralizing antibody immunization in acute SIV infection on viremia control in rhesus macaques.

BACKGROUND: Antiviral antibodies, especially those with neutralizing activity against the incoming strain, are potentially important immunological effectors to control human immunodeficiency virus (HIV) infection.While neutralizing activity appears to be central in sterile protection against HIV infection, the entity of inhibitory mechanisms via HI

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