Objective To investigate the necessity to test the hearing of patients whose initial symptom is tinnitus with pure tone audiometer. Methods To analyze the results of pure tone audiometer of 218 tinnitus patients.Results Among 218 cases of tinnitus patients,a total of 123 patients with abnormal hearing,among 95 cases of patients with normal hearing, except for 50 cases of tinnitus, no other cause of disease. Conclusion Among the normal hearing tinnitus patients, we should do further hearing test for them if they are not identified a clear cause of disease,such as auditory brainstem response,otoacoustic emission and other necessary checks to clear the reasons for tinnitus or the position of the unusual auditory system. It is important for early diagnosis and treatment of tinnitus. But the pure-tone audiometer should be a routine examination when tinnitus patients come for the first visit.

The hydrophilicity of the normal decoction pieces (NDP) of Indigo Naturalis is not good, therefore, it is not suit for decoctions. In this paper, powder modification technology is used and some NDP and alcohol are ground together in the vibromill to prepare the hydrophilic decoction pieces (HDP) of Indigo Naturalis. Initially, the properties of NDP, ultrafine decoction pieces (UDP) and HDP are compared, the hydrophilicity of UDP was promoted slightly, that of HDP is promoted dramatically. Then, three batches of Indigo Naturalis are prepared to HDP separately, but there is no obvious difference in the contact angle. Furthermore, the size distribution, surface area and micro-shape of HDP are bigger than that of UDP and smaller than NDP. The contents of indigo and indirubin in three decoction pieces are the same, as well as the species of inorganic substance, although there is a little difference in the proportion of five inorganic substances. The fact suggests the change of physical state and the qualitative and quantitative change of organism and inorganic substances are not the main factors to influence the hydrophilicity. In addition, hydroxyl, methylene and methyl can be identified at the wavenumber of 3 356 cm(-1) and 1 461 cm(-1) in infrared spectrum; the content of alcohol in HDP is 0.67% measured by gas chromatogram. The stability of HDP in the heating condition is studied, the fact suggests the hydrophilic effect of HDP at 40 degrees C is relatively stable. All above research suggests that the alcohol is the main factor to influence the hydrophilicity and maybe the intermolecular force which fixed alcohol molecule on the surface of Indigo Naturalis is the basic principle to produce the hydrophilicity.

Objective To analyze the influence of the cesarean section and vaginal delivery at term pregnancy when fetal distress in labor conditions on maternal and neonatal outcomes .Methods 238 cases of fetal distress in labor when full-term pregnant were selected ,and they were randomly divided into the observation group and control group,119 cases in each group .The control group was given midwifery vaginal delivery ,while the observation group was given cesarean section .The maternal and neonatal outcomes were compared between the two groups . Results 78 cases(65.55%) of neonatal score above 7 or more points and 7 or more points of the control group were 58 cases(48.74%),the difference was significant (P<0.05).The incidence rate of neonatal complications in the observation group was 5.88%, which was significantly lower than 20.16% of the control group ( P <0.05 ). Conclusion Fetal distress in full-term pregnancy in labor , the use of cesarean section has higher neonatal score compared with vaginal delivery ,and it has low incidence rate of neonatal complications ,it is worth to be applied in clinical.

OBJECTIVETo establish the method for determining muscone in rat intestinal perfusate by GC-MS/MS and study its intestinal absorption kinetic characteristics in rats.

METHODThe GC-MS/MS method was used to determine the content of muscone in rat intestinal circulation fluid. In situ intestinal circulation perfusion was adopted to study absorption kinetics of muscone in rats.

RESULTMuscone was proved to be well absorbed in each section of small intestine. Its absorption rate constants (Ka) and the absorption rate (A) in the rat intestine showed duodenum > jejunum (P < 0.05) , duodenum > ileum (P < 0.01). Its Ka, A and t1/2 in rat small intestine was 0.990 h(-1) , 43.58% and 0.705h, respectively.

CONCLUSIONMuscone was well absorbed in each intestinal section, with duodenum better than jejunum (Ka, T1/2, P < 0.05) significantly better than ileum (Ka, T1/2, P < 0.01; A, P < 0.05). There is no obvious statistical difference between jejunum and ileum.

Animals ; Chromatography, Gas ; methods ; Cycloparaffins ; analysis ; pharmacokinetics ; Intestinal Absorption ; drug effects ; Intestines ; drug effects ; metabolism ; Perfusion ; Rats ; Rats, Wistar ; Tandem Mass Spectrometry ; methods

Unlike the well-established picture for the entry of enveloped viruses, the mechanism of cellular entry of non-enveloped eukaryotic viruses remains largely mysterious. Picornaviruses are representative models for such viruses, and initiate this entry process by their functional receptors. Here we present the structural and functional studies of SCARB2, a functional receptor of the important human enterovirus 71 (EV71). SCARB2 is responsible for attachment as well as uncoating of EV71. Differences in the structures of SCARB2 under neutral and acidic conditions reveal that SCARB2 undergoes a pivotal pH-dependent conformational change which opens a lipid-transfer tunnel to mediate the expulsion of a hydrophobic pocket factor from the virion, a pre-requisite for uncoating. We have also identified the key residues essential for attachment to SCARB2, identifying the canyon region of EV71 as mediating the receptor interaction. Together these results provide a clear understanding of cellular attachment and initiation of uncoating for enteroviruses.
Acids ; chemistry ; Amino Acid Sequence ; Animals ; Capsid Proteins ; chemistry ; genetics ; metabolism ; Enterovirus A, Human ; genetics ; metabolism ; physiology ; HEK293 Cells ; Host-Pathogen Interactions ; Humans ; Hydrogen-Ion Concentration ; Lysosome-Associated Membrane Glycoproteins ; chemistry ; genetics ; metabolism ; Molecular Docking Simulation ; Molecular Sequence Data ; Protein Binding ; Protein Conformation ; Protein Interaction Mapping ; Protein Structure, Tertiary ; RNA, Viral ; genetics ; metabolism ; Receptors, Scavenger ; chemistry ; genetics ; metabolism ; Sequence Homology, Amino Acid ; Sf9 Cells ; Static Electricity ; Virion ; genetics ; metabolism ; Virus Attachment

Recombinant human interferon α2b(rhIFNα2b)is widely used as an antiviral therapy agent for the treatment of hepatitis B and hepatitis C.The current identification test for rhIFNα2b is complex.In this study,an anti-rhIFNα2b nanobody was discovered and used for the development of a rapid lateral flow strip for the identification of rhIFNα2b.RhIFNα2b was used to immunize an alpaca,which established a phage nanobody library.After five steps of enrichment,the nanobody I22,which specifically bound rhIFNα2b,was isolated and inserted into the prokaryotic expression vector pET28a.After subsequent purification,the physicochemical properties of the nanobody were determined.A semiquantitative detection and rapid identification assay of rhIFNα2b was developed using this novel nanobody.To develop a rapid test,the nanobody I22 was coupled with a colloidal gold to produce lateral-flow test strips.The developed rhIFNα2b detection assay had a limit of detection of 1 μg/mL.The isolation of I22 and successful construction of a lateral-flow immunochromatographic test strip demonstrated the feasibility of performing ligand-binding assays on a lateral-flow test strip using recombinant protein products.The principle of this novel assay is generally applicable for the rapid testing of other com-mercial products,with a great potential for routine use in detecting counterfeit recombinant protein products.

Traditional Chinese herbs (TCH) are currently gaining attention in disease prevention and health care plans. However, their general bitter taste hinders their use. Despite the development of a variety of taste evaluation methods, it is still a major challenge to establish a quantitative detection technique that is objective, authentic and sensitive. Based on the two-bottle preference test (TBP), we proposed a novel quantitative strategy using a standardized animal test and a unified quantitative benchmark. To reduce the difference of results, the methodology of TBP was optimized. The relationship between the concentration of quinine and animal preference index (PI) was obtained. Then the PI of TCH was measured through TBP, and bitterness results were converted into a unified numerical system using the relationship of concentration and PI. To verify the authenticity and sensitivity of quantified results, human sensory testing and electronic tongue testing were applied. The quantified results showed a good discrimination ability. For example, the bitterness of Coptidis Rhizoma was equal to 0.0579 mg/mL quinine, and Nelumbinis Folium was equal to 0.0001 mg/mL. The validation results proved that the new assessment method for TCH was objective and reliable. In conclusion, this study provides an option for the quantification of bitterness and the evaluation of taste masking effects.

ObjectiveBased on spatial metabolomics technology combined with pharmacological indexes， to analyze the mechanism of Fritillariae Cirrhosae Bulbus（FCB） powder in improving bleomycin-induced pulmonary fibrosis in rats. MethodSixty SD rats were randomly divided into five groups， including the blank group， the model group， and high， medium， low dosage groups of FCB. Except for the blank group， rats in all other groups were injected with bleomycin by tracheal injection to establish a pulmonary fibrosis model. Postoperatively， the high， medium and low dosage groups of FCB were administered aqueous solutions of FCB powder at doses of 0.36， 0.18， 0.09 g·kg^-1， respectively， continuously for 28 d. The blank and model groups were given an equal volume of distilled water by gavage. After the last administration， lung tissues and blood samples were collected， the pathological conditions of rat lung tissues were comprehensively evaluated by hematoxylin-eosin（HE） and Masson staining， and aerodynamic assisted desorption electrospray ionization mass spectrometry imaging（AFADESI-MSI） was used for MSI of rat lung tissues from different experimental groups. Spatial metabolomics analysis was conducted on the fibrotic areas of lung tissues in the model group and the high dosage group of FCB based on HE staining images. Differential metabolites between groups were screened by orthogonal partial least squares-discriminant analysis（OPLS-DA）， with variable importance in the projection（VIP） values>1， t-test P<0.05， and fold change analysis. Metabolic pathway analysis of the identified differential metabolites was performed using Kyoto Encyclopedia of Genes and Genomes（KEGG）. Protein expression levels of nuclear transcription factor-κB p65（NF-κB p65） and heme oxygenase-1（HO-1） in rat lung tissues were detected by Western blot. Biochemical assessments of superoxide dismutase（SOD）， malondialdehyde（MDA） and glutathione（GSH） levels in rat lung tissues were conducted. Serum levels of interleukin（IL）-1β， IL-6， nuclear factor erythroid 2 related factor 2（Nrf2）， and tumor necrosis factor-α（TNF-α） were measured by enzyme linked immunosorbent assay（ELISA）， and some of the screened signaling pathways with strong correlation were verified. ResultThe results of MSI experiment showed that after 28 d of the administration of FCB powder to rats with pulmonary fibrosis， the content of L-arginine in the fibrotic regions of lung tissues was significantly different from that of rats in the model group， and the content of phosphatidylcholine was lower than that in the fibrotic region of lung tissues of rats in the model group. Western blot results confirmed that， in comparison to the model group， oral administration of FCB powder for 28 d could inhibit the elevated expression of NF-κB p65 protein in the lung tissues of rats with pulmonary fibrosis. Furthermore， high dose of FCB powder was able to significantly inhibit the expression of HO-1 after oral administration （P<0.05）. The cytokine detection results indicated that the concentrations of IL-1β， IL-6 and TNF-α in the serum of rats from the high， medium， low dosage groups of FCB were reduced by comparing with the model group， and the high dose of Chuanbeimu powder administered by gavage could significantly inhibit the trend of decreased SOD， GSH， Nrf2 contents and increased MDA content induced by bleomycin. ConclusionOral administration of FCB powder has the potential to partially ameliorate bleomycin-induced pulmonary fibrosis in rats， and its mechanism may be related to the regulation of pathways associated with inflammation（NF-κB p65） and oxidative stress（Nrf2/HO-1）.

Phyllanthi Fructus is a highly unique medicine and food homologous item, which exhibits distinctive flavor, notable nutritional value, and abundant pharmacological activity. It has enormous potential in the creation of health products and pharmaceuticals. However, due to the unique laws of quality formation and transfer of Phyllanthi Fructus, its appearance, shape, chemical compositions, nutrients, and sensory flavors are frequently greatly influenced by botanical resources, the processing and storage conditions. As a result, the current quality evaluation model is difficult to meet the needs of Phyllanthi Fructus as a medicine and food homologous item in the development of diversified products. This paper constructs the hierarchical utilization mode of Phyllanthi Fructus based on its unique quality formation and transmission laws, explores the quality evaluation model for food-oriented use and medicinal-oriented use, respectively, and systematically describes the quality evaluation idea under diversified application scenarios. This paper aims to serve as a reference for the construction of a quality evaluation model suitable for the medicine and food homologous item of Phyllanthi Fructus.