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Molecular biology
See Null mutation.

Statistics
Completely absent; a set with no members or of zero magnitude. If a field has a value of null, it means that the value is unknown. A null value is not the same as a value of zero, and the difference can be crucial. For example, when calculating the average value of a field among many records where one row contains a zero, the zero gets factored into the average; if the field has a null value, it does not get factored in to the average.
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References in periodicals archive ?
What Hamilton says of the NUL's mission and situation applies equally well to all black organizations: "The economy is, without a doubt, one of the greatest challenges we face today as an institution, as we try to address the issue of economic self-sufficiency for the individuals and communities that make up our constituency.
Black leadership: the next generation: as today's leaders grow older, who will our future leaders be? (National News)
Les Nordistes restent sur deux victoires et trois nuls, dont le dernier samedi dernier a Marseille (1-1), et pourraient abandonner leur statut de relegable en cas de bon resultat face a Lyon.
Ligue 1: Brest dans la ligne de mire de Lille et du PSG
Menes 2 a 0, les vice-champions d'Allemagne 2010 se sont reveilles et ont arrache le nul grace a Kls-Jan Huntelr qui a inscrit son 8e but de la saison en s'aidant de la main.
Schalke 04 et Kaiserslautern possedent des incroyables ressources
His 29-year career with NUL included stints as director of the San Diego and Washington, D.C., affiliates.
Climbing Jacob's new ladder; former NUL president John Jacob's new job: to watch over the corporate image of Anheuser-Busch
Le WAC a bien fait d'aller faire un nul blanc sur la pelouse du club Horoya Conakry, samedi en match comptant pour les quarts de finale-aller de la Champions League.
Le WAC commence la phase des Quarts par un nul a Conakry
Le match retour s'etait solde egalement sur un score nul (1-1).
Coupe des clubs de l'UAFA : Le Raja elimine par Al Arabi
L'entraEneur du club merengue se dit confiant malgre le match nul de son equipe en ouverture de la Liga.
Mourinho : Je suis l'entraEneur ideal
Les deux derniers matches de la 23 e journee du championnat national de football en Division 1, Botola Maroc Telecom, ont connu la victoire du Raja Casablanca devant le Kawkab Marrakech (1-2) et le nul de l'Ittihad Tanger face a l'AS FAR (0-0).
Le Raja enfonce le KACM et retrouve la seconde place

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