The phrase "are not obtained" is correct and usable in written English.
It can be used in contexts where you want to indicate that something has not been acquired or achieved.
Example: "The desired results are not obtained through random guessing."
Alternatives: "are not acquired" or "are not achieved".
Although fully mature size and shape are not obtained until puberty, the main outlines of the brain are recognizable by the end of the third fetal month.
If these conditions are not obtained, they diagnose the breakdown, inform the monitoring infrastructure, and attempt to achieve the failed goal through other means.
Immunofluorescence (IF) microscopy adds information on cell morphology and the microenvironment that are not obtained using flow-based techniques, but the multiplicity of conventional IF is limited.
A procedure involving the PCR over enzyme digest fragments is also proposed for when, exceptionally, positive results are not obtained.
This means that maximum power transfer and efficiency conversion are not obtained in correspondence with the resonant frequency.
Both these features indicate that the SiC nanorods are not obtained through the chemical conversion of nanotubes.
Rather, what Hume claims to prove is that such natural beliefs are not obtained from, and cannot be demonstrated by, either empirical observation or reason, whether intuitive or inferential.
The survival curves derived from our computational simulations showed an area of hyper-radiosensitivity at low-doses that are not obtained using a traditional radiobiological model.
The quantification of pathogenic bacteria in an environmental or clinical sample commonly involves laboratory-based techniques and results are not obtained for 24 72 h after sampling.
Consequently, conventional milling devices typically produces particles with an average size no smaller than several ten micrometres5, and nanoparticles are not obtained unless very high energy is applied using a special device such as a high-energy ball mill6,7.
Since pharmaceutical companies rarely collect data about the effects of their drugs on minors, there is scant information about pediatric dosing in the Physicians' Desk Reference, a compendium of guidelines and warnings supplied by drug companies; pediatric handbooks are published by private companies, but they are not comprehensive and their data are not obtained through a consistent methodology.
