when present at

USAGE SUMMARY

The phrase "when present at" is correct and usable in written English.
It can be used to indicate a condition or situation that occurs in the presence of something or someone. Example: "The safety protocols must be followed when present at the construction site."

✓ Grammatically correct

Science

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

This activity was strongly inhibited by the ATN6 polypeptide, which when present at a saturating concentration almost completely inhibited the basal AT activity.

Biochemistry

When present at the ED during the study period between February and September 2015, study physicians included all patients eligible.

Critical Ultrasound Journal

Amongst the positive contributors are the polyfunctional thiols, imparting fruity aroma to wine when present at moderate concentrations (Dubourdieu et al. 2006).

AMB Express

Furthermore, PEG is an uncharged, highly flexible polymer that is known to decrease drug adsorption and cell interactions when present at the surface.

Cancer Nanotechnology

In recent years, highly sensitive assays have been developed that detect HIV-1 drug resistance mutations when present at less than 1% of the viral population.

Journal of Virological Methods

Previously we identified a lead sulfonamide that selectively bound to the pleckstrin homology (PH) domain of AKT and induced apoptosis when present at low micromolar concentrations.

Bioorganic & Medicinal Chemistry

Furthermore, unsaturated medium sand layers exhibited significantly greater retention than adjacent saturated fine sand layers when present at low saturations high above the water table.

Journal of Contaminant Hydrology

Conversely, influent p-cresol ultimately enhanced biotransformation of the other co-substrates in the mixture when present at a concentration (10000ppb) that did not deplete all available oxygen.

Journal of Contaminant Hydrology

Fluoride in drinking water is a pressing global issue as it can cause dental and skeletal fluorosis when present at levels above the World Health Organization (WHO 2008) drinking water guideline of 1.5 mg/l.

Applied Water Science

The underlying hypothesis of this study was that fruit juice and puree characteristics influence the enrichment requirements of this organism, and that in some matrices, the organism can be detected within 24 hours even when present at low initial contamination.

International Journal of Food Contamination

In a biological system, an antioxidant is defined as any substance that when present at low concentrations compared with those of an oxidizable substrate significantly delays or prevents oxidation of that substrate.

Journal of Analytical Science and Technology

Expert writing Tips

Best practice

When using "when present at", ensure the context clearly defines what is considered "present". Specify quantities, concentrations, or conditions to avoid ambiguity.

Common error

Avoid using "when present at" without clearly specifying the conditions or concentrations under which the presence matters. For example, instead of saying "the reaction occurs when present at", specify "the reaction occurs when the catalyst is present at a concentration of 5% or higher".

Linguistic Context

The phrase "when present at" functions as an adverbial clause of condition, specifying the circumstances under which a particular action or state occurs. Ludwig's examples demonstrate its use in scientific and technical contexts to describe how the presence of a substance or condition affects an outcome.

Expression frequency: Very common

Frequent in

Science

100%

Less common in

News & Media

0%

Formal & Business

0%

Academia

0%

Ludwig's WRAP-UP

In summary, "when present at" is a grammatically correct and commonly used phrase, particularly in scientific and technical writing. Ludwig AI confirms its acceptability. It functions as an adverbial clause to establish conditional relationships, indicating that an action or state is contingent upon the presence of something in a specific location or time. To ensure clarity, it's crucial to specify what constitutes "presence" in the given context. While highly prevalent in scientific domains, its usage in other contexts is rare.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

if it is present at

This alternative emphasizes the conditional aspect more explicitly using "if" and specifies "it" for clarity.

in the presence of

This phrase focuses on the physical or conceptual existence of something without direct temporal implication.

while being at

This alternative uses a more active voice, emphasizing the state of being present simultaneously with another event.

during its existence at

This phrase adds emphasis to duration and location, useful when focusing on the period something is present.

when located at

This alternative emphasizes the physical placement or positioning of something.

if found at

This alternative implies discovery or detection at a place.

being situated at

This is a more formal way of expressing location or positioning.

on being at

This alternative has a more literary or formal tone, suggesting a state of existence at a place.

upon arrival at

This phrase specifies that the action occurs immediately after reaching a location.

while stationed at

This implies a more permanent or assigned presence at a location.

FAQs

How can I use "when present at" in a sentence?

You can use "when present at" to indicate a condition that is met due to the presence of something in a particular location or time. For instance, "The device activates "when present at" the specified coordinates".

What are some alternatives to "when present at"?

Alternatives include phrases like "in the presence of", "if it is present at", or "when located at", depending on the specific context.

Is there a difference between "when present at" and "in the presence of"?

"When present at" often implies a specific trigger or condition based on location or time, while "in the presence of" generally refers to a more constant or general coexistence.

Can "when present at" be used in formal writing?

Yes, ""when present at"" is suitable for formal writing, especially in scientific and technical contexts, where precise conditionality is important.