The isotope values were expressed as parts per thousand or per mil ([per thousand]) or 5 deviation from the internationally recognized standards, VPDB, atmospheric N,
VCDT (Vienna Canyon Diablo Troilite), V-SMOW (Vienna-Standard Mean Ocean Water) (Groning 2004) for C, N, S and O, respectively.
Garzon TJA, Acosta GG, Torres PI, Gonzales CM, Rivera BRF, Maya HV, Guevara GRG (2002) Presencia de los geminivirus, huasteco del chile (PHV), texano del chile variante Tamaulipas (TPV-T), y chino del tomate (
VCdT), en los estados de Guanajuato, Jalisco y San Luis Potosi, Mexico.