The phrase "absence of samples" is correct and usable in written English.
It can be used in contexts where you are discussing the lack or unavailability of samples, such as in research, testing, or quality control.
Example: "The study faced significant challenges due to the absence of samples from the control group."
Alternatives: "lack of samples" or "nonexistence of samples".
Due to the absence of samples that produced more than 1% CBN and CBC, we excluded these two cannabinoids from the analysis.
In the absence of samples of CO2 pre-injection reservoir gas we use the Ne isotope composition of the production and injection well gases to determine the isotopic composition of the natural gas.
Unsupervised procedures on the other hand are used in absence of samples or previous information on the ground.
Control experiments included immunoprecipitation in the absence of samples and/or antibody.
The absence of samples collected directly from the lungs of CARDIA participants which could then be correlated with CRP and fibrinogen in the blood limits our ability to explore this possibility further in the CARDIA cohort.
The cells were incubated in the presence or absence of samples at 37°C in an incubator under an atmosphere containing 5% CO2 for 18 24 hours.
We discuss recent elegant designs of sensing interface with improved performance with respect to sensitivity, selectivity, stability, simplicity, and the absence of sample matrix effects.
We follow an emulation-like approach as we assume that we know how to solve the problem in the absence of sampling and then we study how to design the event-triggering rule under communication constraints.
The effect of iron was investigated by studying the evolution of the moments, volume or mass moment mean D(4.3), number based mean size (¯¯¯L1.0), nickel depletion rate and population balance in the absence of sampling between batch reductions.
The scavenging activity (% SA) of DPPH radicals was calculated using equation [% SA = (1 − Abs in the presence of sample/Abs in the absence of sample) × 100].
The negative controls (down left of each partition) showed no positive signals, demonstrating the absence of sample pollution or unspecific amplification.
