The following simple example uses two tables to demonstrate Null placeholder production in a left outer join.
T-DNA mutations in TRM4A or TRM4B were identified and the homozygous mutants characterized by semi-quantitative RT-PCR to demonstrate null expression (Fig. 2c and Additional file 1: Figure S2C) and show mutants are most likely complete loss of function.
Interestingly, Mensch et al. (2008) [10] demonstrated a null input of the genotype by sex interaction to total phenotypic variance using a set of lab lines, as did the study of Van't Land et al. 1999) [9] showing clinal variation in South American populations.
The results have demonstrated a null association between the effect of TZDs and gastric cancer in diabetic patients in Taiwan.
In addition to the LRol phenotype, we have demonstrated that null alleles of rol-3 result in developmental arrest, associated with an inability to molt.
Murine studies have demonstrated that null mutations in L1cam can interact with Sox10 mutations to increase the penetrance of aganglionosis and result in more severe pathology (206).
It was also demonstrated that null Atcdc48a alleles have a drastically reduced transmission efficiency through the male gametophyte (i.e. ATCDC48A is essential for normal pollen germination and tube elongation) [ 57].
There were only 3 studies reporting the association between physical activity and risk of ESCC with conflicting results, and the meta-analysis demonstrated a null association (OR, 1.10; 95% CI, 0.21-5.64).
Although the molecular components in this process are still largely unknown, the significance of one key component, CSP-α (DNAJC5), in vision has been demonstrated using null mice (Schmitz et al., 2006).
The following example demonstrates the Null result returned by using Null with the SQL || string concatenation operator.
