The phrase "are very stringent and" is correct and usable in written English.
It can be used when describing rules, regulations, or standards that are strict or severe in nature.
Example: "The new safety protocols are very stringent and must be followed by all employees to ensure a safe working environment."
Alternatives: "are extremely strict and" or "are highly rigorous and".
The reason is that the government's targets are very stringent, and everyone in the hospital is working towards meeting them.
China is now a bigger carbon polluter than the United States, so don't expect a tax or cap-and-trade rules to solve global warming, even if American measures are very stringent — and they probably won't be, because higher home heating bills are not a vote winner.
The dimensional stability and tolerance requirements of the payload interfaces are very stringent and there is a need to improve these under the specified thermal environment.
It may just be that moral demands upon us really are very stringent, and identity-conferring commitments must sometimes (perhaps often) be sacrificed in the interests of, say, our acting to ameliorate preventable suffering.
In the biopharmaceutical industry, purity requirements are very stringent and the protein of interest undergoes several chromatographic steps before it can be considered pure.
Our criteria for defining complete genomes are very stringent and include far more than the presence of all 57 single copy genes.
We receive 6000 applications per year, we interview 400, and admit 80, so the process is very stringent, and seemingly all candidates are smarter than the interviewers, and with compelling resumes.
Yet, this correction is very stringent and over-conservative – in particular when correcting for testing all phenotypes and all strains.
The criteria for the ascertainment of tuberculosis cases in the present study were very stringent and based on clinical features (signs and symptoms of TB), chest X-ray findings, and positive sputum-smear tests.
It is very stringent and yields robust transcriptomic signatures.
However, hybridization conditions were very stringent and the fact that most other actins are expressed ubiquitously and that we do not see ubiquitous staining, argues against this.
