[Preparation of sulfonic acid functionalized covalent organic framework solid phase microextraction fibers and their application in the analysis of neurotransmitters in the mouse brain].

Neurotransmitters (NTs) are essential for intercellular communication and primarily include monoamine, amino acid, and cholinergic NTs. These molecules play important roles in the body's stress response, motor coordination, neuronal communication, and homeostatic functions. Previous studies have shown that abnormal changes in NT levels are associated with various neurological disorders.

Evaluation of guidelines for diagnosis and treatment of Helicobacter pylori infection.

Background: To systematically evaluate the quality of the guidelines for the diagnosis and treatment of Helicobacter pylori infection and to analyze the differences and reasons for the key recommendations in the guidelines.

Methods: Databases and websites were systematically searched to obtain guidelines for the diagnosis and treatment of Helicobacter pylori infection. Four independent reviewers used the Guideline Evaluation Tool (AGREE II) to evaluate the included guidelines.

Quality assessment of the guidelines for the management of malignant pleural effusions and ascites.

Objectives: To fully assess the quality of the guidelines for the management of malignant pleural effusions (MPE) and ascites and reveal the heterogeneity of recommendations and possible reasons among guidelines.

Methods: A systematic search was performed in the database to obtain guidelines for the management of MPE and ascites. The AGREE IIGtool was used to assess the quality of these guidelines.

Sensitive determination of tilmicosin, erythromycin ethylsuccinate and clindamycin by CE with electrochemiluminescence detection using azithromycin as internal standard and its applications.

A sensitive approach for the simultaneous determination of tilmicosin, erythromycin ethylsuccinate and clindamycin was developed by CE coupled with electrochemiluminescence detection with ionic liquid. The parameters for CE, electrochemiluminescence detection and the effect of ionic liquid were investigated systematically. The three analytes were well separated and detected within 8 min.

The investigation of the interactions between CdSe quantum dots and human serum albumin by resonance Rayleigh scattering and second-order scattering spectra.

Human serum albumin (HSA) was the most abundant protein in human plasma and has significant physiological function. In Tris-HCl buffer solution (pH 7.4), water-soluble semiconductor CdSe quantum dots (QDs) reacted with HSA and the products resulted in a great enhancement of the intensity of resonance Rayleigh scattering (RRS) and second-order scattering (SOS).

A sensitive method for simultaneous determination of four macrolides by CE with electrochemiluminescence detection and its applications in human urine and tablets.

A sensitive method for simultaneous determination of azithromycin (AZI), acetylspiramycin (ACE), erythromycin (ERY), and josamycin (JOS) was developed by CE coupled with electrochemiluminescence detection with Ru(bpy)(3) (2+). The parameters related to separation and detection were investigated in detail. The four macrolides were well separated and detected within 6 min under the optimized conditions.

The determination of glutamine with flow-injection chemiluminescence detection and mechanism study.

The main purpose of this study was to develop an inexpensive, simple, rapid and sensitive chemiluminescence (CL) method for the determination of glutamine (Gln) using a flow-injection (FI) system. Gln was found to strongly inhibit the CL signal of the luminol-H(2)O(2)-CuSO(4) system in Na(2)B(4)O(7) solution. A new FI-CL method was developed for the determination of Gln.

Analysis of human immunodeficiency virus type 1 nef gene sequences among inmates from prisons in China.

To provide the hard-won information on HIV-1 polymorphism from inmates in prison and to study the genetic variation of HIV-1 strains, we analyzed the characterization of the nucleotide and corresponding protein sequences of naturally occurring nef sequences derived from 16 HIV-1-positive inmates from prisons in China. Nested PCR and DNA sequencing were used to determine nef sequences in peripheral blood mononuclear cells. Phylogenetic analysis revealed a distribution of the viral sequences among subtype B, CRF_BC, and CRF_AE, with subtype B accounting for more than half of the genotypes.