Selective detection of urease-producing bacteria on the genital skin surface in patients with incontinence-associated dermatitis.

We aimed to investigate the association between the presence of cutaneous urease-producing bacteria and the development of incontinence-associated dermatitis (IAD) using an original urea agar medium as a step toward developing advanced preventive measures. In previous clinical assessments, we developed an original urea agar medium to detect urease-producing bacteria via the medium's colour changes. In a cross-sectional study, specimens were collected via the swabbing technique at genital skin sites in 52 stroke patients hospitalised in a university hospital. The primary objective was to compare the presence of urease-producing bacteria between the IAD and no-IAD groups. Determining the bacterial count was the secondary objective. The prevalence of IAD was 48%. A significantly higher detection rate of urease-producing bacteria was observed in the IAD group than in the no-IAD group (P = .002) despite the total number of bacteria being equivalent between them. In conclusion, we discovered that there was a significant association between the presence of urease-producing bacteria and IAD development in hospitalised stroke patients.

A Pyrene-Modified Serinol Nucleic Acid Nanostructure Converts the Chirality of Threoninol Nucleic Acids into Circularly Polarized Luminescence Signals.

Herein is reported a circularly polarized luminescent (CPL) probe that can respond to the chirality of nucleic acids. An achiral nanostructure was prepared by the hybridization of symmetric serinol nucleic acid (SNA) containing pyrene-modified residues. When chiral oligomers that were complementary to the SNA were added, they induced helicity into the SNA nanowire. Efficient circular dichroism (CD) signal amplification was observed when pyrene was attached to uracil bases through a rigid alkynyl linker. Both CPL and CD signals were observed; they depended on the chirality of the added acyclic threoninol nucleic acid (aTNA) oligomer. This system can be used to convert the chirality of chiral biomolecules into chiroptical signals.

Bifacial Nucleobases for Hexaplex Formation in Aqueous Solution.

Although DNA can form triplex and quadruplex structures through hydrogen bonds, design and preparation of structures with more than five strands is difficult even when artificial nucleic acids are used. Herein we report a hexaplex formed by oligomers of artificial nucleic acids bearing bifacial molecules on d-threoninol. Aminopyrimidine and cyanuric acid derivatives were selected as bases because they have complementary hydrogen bonding patterns. The complex formed by aminopyrimidine and cyanuric acid decamers melted with large hysteresis. Hexaplex formation was indicated by gel electrophoresis, size exclusion chromatography and atomic force microscopy imaging, and proven directly through native mass spectrometry. CD measurements and molecular dynamics simulations indicated that the hexaplex adopts a helical structure. The hexaplex formation was highly dependent on pH and the presence of divalent cations. The hexaplex was stable in aqueous solution, and its unique structure and properties may lead to novel nanostructures, molecular assemblies, metal sensors, and ion channels.

Bacterial species distribution on the genital skin of hospitalized patients with stroke manifesting incontinence-associated dermatitis: A cross-sectional study.

AIM: To compare the isolated and identified bacterial species colonizing on the genital skin between patients with and without incontinence-associated dermatitis. METHODS: This cross-sectional study included 102 patients with stroke admitted to an acute hospital in Japan. Swabs were collected, and bacterial species found in swabs were isolated and identified using a selective agar medium and simple identification kits. In addition to demographic information, severity of incontinence-associated dermatitis and the total bacterial counts were measured. RESULTS: Incontinence-associated dermatitis was present in 53.9% of the participants. Staphylococcus aureus was found in 50% of the participants with incontinence-associated dermatitis and only 17.9% of those without incontinence-associated dermatitis (P = 0.0029). Bacterial species distribution by erythema and skin erosion, which denote severity of incontinence-associated dermatitis, was different, but not significant; additionally, the total number of bacterial colonies was equivalent. CONCLUSIONS: Bacterial species distribution differed between patients with and without incontinence-associated dermatitis, whereas the total number of bacterial colonies was equivalent. A high detection rate of S. aureus on genital skin sites potentially affects the presence of incontinence-associated dermatitis and its severity. Geriatr Gerontol Int 2023; 23: 537-542.

A helical amplification system composed of artificial nucleic acids.

Herein we report an amplification system of helical excess triggered by nucleic acid hybridization for the first time. It is usually impossible to prepare achiral nanostructures composed of nucleic acids because of their intrinsic chirality. We used serinol nucleic acid (SNA) oligomers for the preparation of achiral nanowires because SNA oligomers with symmetrical sequences are achiral. Nanowire formation was confirmed by atomic force microscopy and size exclusion chromatography. When a chiral nucleic acid with a sequence complementary to SNA was added to the nanostructure, helicity was induced and a strong circular dichroism signal was observed. The SNA nanowire could amplify the helicity of chiral nucleic acids through nucleobase stacks. The SNA nanostructures have potential for use as platforms to detect chiral biomolecules under aqueous conditions because SNA can be readily functionalized and is water-soluble.