Skip to search formSkip to main contentSkip to account menu

Null Value

Known as: None, Null 
A special value that may be stored in some database columns to represent an unknown, missing, not applicable, or undefined value.(from Free On-Line… 
National Institutes of Health

Papers overview

Semantic Scholar uses AI to extract papers important to this topic.
Highly Cited
1998
Highly Cited
1998
Differential use of the signal recognition particle translocase targeting pathway for inner membrane protein assembly in Escherichia coli.
Assembly of several inner membrane proteins-leader peptidase (Lep), a Lep derivative (Lep-inv) that inserts with an inverted… 
Highly Cited
1996
Highly Cited
1996
Involvement of Leukemia Inhibitory Factor in the Increases in Galanin and Vasoactive Intestinal Peptide mRNA and the Decreases in Neuropeptide Y and Tyrosine Hydroxylase mRNA in Sympathetic Neurons…
Abstract: In response to axonal injury, noradrenergic sympathetic neurons of the adult superior cervical ganglion (SCG) alter… 
Highly Cited
1992
Highly Cited
1992
A presumptive helicase (MOT1 gene product) affects gene expression and is required for viability in the yeast Saccharomyces cerevisiae
Exposure of a haploid yeast cell to mating pheromone induces transcription of a set of genes. Induction is mediated through a cis… 
Review
1990
Review
1990
Striking conservation of TFIID in Schizosaccharomyces pombe and Saccharomyces cerevisiae
EUKARYOTIC promoters contain binding sites for basic transcription factors and gene-specific activator proteins1–6. The… 
Highly Cited
1988
Highly Cited
1988
Essential and non-essential domains in the Bradyrhizobium japonicum NifA protein: identification of indispensable cysteine residues potentially involved in redox reactivity and/or metal binding.
The amino acid sequence of the Bradyrhizobium japonicum nitrogen fixation regulatory protein NifA, as derived from the nucleotide… 
Highly Cited
1988
Highly Cited
1988
Design and analysis of experiments on random drift and inbreeding depression.
While the genetic consequences of inbreeding and small population size are of fundamental importance in many areas of biology… 
Highly Cited
1976
Highly Cited
1976
Structural gene sets active in embryos and adult tissues of the sea urchin
Highly Cited
1976
Highly Cited
1976
Hippocampal theta rhythm. I. Depth profiles in the curarized rat
Highly Cited
1974
Highly Cited
1974
Cell surface markers for human T and B lymphocytes
A series of 4 cell surface marker systems have been developed and applied to human thymus, tonsil and purified blood lymphocyte… 
Highly Cited
1965
Highly Cited
1965
Sociobiology of rhesus monkeys. II. Stochastics of social communication.
By clicking accept or continuing to use the site, you agree to the terms outlined in our Privacy Policy (opens in a new tab), Terms of Service (opens in a new tab), and Dataset License (opens in a new tab)