The phrase "are extremely resistant to" is correct and usable in written English.
It can be used to describe something that has a high level of resistance to a particular factor or condition.
Example: "These materials are extremely resistant to corrosion, making them ideal for use in harsh environments."
Alternatives: "are highly resistant to" or "are very resistant to".
For Deinococcus radiodurans and other bacteria which are extremely resistant to ionizing radiation, ultraviolet radiation, and desiccation, a mechanistic link exists between resistance, manganese accumulation, and protein protection.
However, the SNP's move has been rejected by Labour ministers, who are extremely resistant to any formal or explicit deal with Salmond.
In nature, humic substances are extremely resistant to biodegradation (Paul et al. 1997).
Furthermore, DRL centers are extremely resistant to heat treatment of samples, and consequently, based thereon devices are not practically subject of degradation [3].
It is well known that malignant tumor cells, such as GBM, are extremely resistant to apoptosis and particularly resistant to radiation and chemotherapy.
The γ′ precipitates in all four alloys tend to become spatially correlated parallel to the cube directions, but they are extremely resistant to coalescence or rafting.
The metal is white, hard, lustrous, and brittle and is extremely resistant to ordinary corrosive reagents; this resistance accounts for its extensive use as an electroplated protective coating.
Pancreatic carcinoma is extremely resistant to therapeutic intervention which probably includes resistance to apoptosis induction (Warshaw and Fernandez-del Castillo, 1992).
As judged from PK-resistance and conformational stability assays, both PrPSc and atypical PrPres were extremely resistant to PK degradation and GdnHCl-induced denaturation (Additional file 2: Figure S2).
Television isn't inimical to such daring artistry — but it's extremely resistant to it.
The form of tuberculosis Mr. Speaker has is extremely resistant to standard antibiotics.
