The phrase "a weak impact in" is correct and usable in written English.
It can be used when discussing the effect or influence of something that is not strong or significant in a particular context.
Example: "The new policy had a weak impact in improving employee morale, as many staff members remained dissatisfied."
Alternatives: "a minimal effect in" or "a slight influence in".
Furthermore, advocacy has had a weak impact, if any, on health protection measures in part because children's environmental health is not on the radar screen of many Mexico's NGOs.
Since advanced age is a strong independent risk factor for mortality in patients with AMI, hyperglycemia may have a relatively greater importance in younger populations and a weaker impact in the elderly population.
Replacement of the existing illumination by LED lamps conjugated with the installation of a presence detector revealed to be a measure with a very weak impact in consumed energy (with savings less than 1%%).
Our work has shown that such variations at high rates have a weak impact on Wolbachia dynamics in haploid and diploid genetic systems, but a high impact in haplodiploid genetic systems.
The children's financial background seems to have only a weak impact on CAM use in Germany, but education significantly predicted the use of several CAM modalities.
Of note, rNK cells had a weak impact on HIV-1 replication in mature infected-DCs (Fig. 5f and 5g).
In spite of these reported class-specific differences of indoor exposure, the impact of gas use for cooking or use of unvented gas/kerosene/oil (water) heater had only a weak impact on relationships being investigated in our study.
Thus, ionic strength has a weak impact on Sr/Ca and Ca/Ca ratios in calcite.
Our experiments show a weak impact of ionic strength on both Sr/Ca and Ca/Ca ratios in calcite.
Parental divorce has only a weak impact on contact with the mother (Kalmijn 2008), so that this omission is less problematic for trends in mother child contact.
