The purpose of this study was to determine if salivary chromogranin a secretion in dogs exhibits a circadian rhythm. Saliva sampling was performed during three different sessions occurring in three nonconsecutive 24-h periods. Sixteen healthy adult beagle dogs (8 males and 8 females) were moved to a sampling room and housed individually in cages. Saliva samples were obtained every 4 h from 12:00 p.m. to 12:00 p.m. the following day. In the interest of habituation, saliva was obtained hourly from each dog 3 h before the experiment was started. Salivary chromogranin A concentrations were measured using an enzyme-linked immunosorbent assay. No circadian rhythm was detected for salivary chromogranin A secretion, and no differences in salivary chromogranin A concentrations measured every 4 h were demonstrated during the 24-h cycle in dogs.
Animals ; Chromogranin A/*analysis/*metabolism ; *Circadian Rhythm ; Dogs/*physiology ; Saliva/*chemistry

Edible bird's nest (EBN) is derived from the saliva of certain types of swiftlets. It is consumed in many parts of the world for its nutritional and medicinal values. Although many claims have been made on the therapeutic and health-promoting effects of EBN, scientific documentations regarding these effects are very limited in published literature. It is not until recently that the biological effects of EBN are being investigated and evidence-based studies are being conducted. Several studies have found that EBN may enhance cell proliferation and differentiation and various beneficial effects have been reported in vitro as well as in vivo. While these studies point towards the potential use of EBN in the treatment or even prevention of several diseases, the mechanisms of action of EBN remain largely unknown and more explorations are needed. This review is one of the very few scientific reviews on EBN which focuses on recent evidence-based discoveries.
Animals ; Birds ; Food ; Humans ; Medicine, Chinese Traditional ; Saliva ; chemistry

Humans ; Occupational Diseases ; diagnosis ; Saliva ; chemistry ; metabolism ; Stress, Psychological ; diagnosis

OBJECTIVES: To investigate the content of pepsin in salivary, and to assess the laryngophargeal lesions based on the reflux founding score (RFS) scale in asymptomatic volunteers, in order to provide a reference for the diagnosis of laryngopharyngeal reflux. METHODS: A total of 91 asymptomatic subjects were recruited in this study. Participants provided a fasting saliva specimen for pepsin measurement using enzyme-linked immunoadsorbent assay, completed the reflux symptom index (RSI) assessment and underwent laryngostroboscopic examination using a rigid endoscope. Their RFS were graded according to the laryngeal findings. RESULTS: The median concentration of pepsin in 91 asymptomatic volunteers was 55.5 μg/L (range 3.53-191.64 μg/L). The mean individuals RSI was 2.24±2.34, and the mean individuals RFS was 5.78±1.74. CONCLUSIONS Our data demonstrate that certain concentration of pepsin was detected and showed a higher RFS score in asymptomatic volunteers.
Humans ; Laryngopharyngeal Reflux ; diagnosis ; Laryngoscopy ; Pepsin A ; analysis ; Saliva ; chemistry ; Volunteers

OBJECTIVEThe aim of this study is to determine the electrochemical corrosion characteristics of Ni-Cr alloys in vitro.

METHODSThe electrochemical corrosion behavior of Ni-Cr alloys was studied by polarization curves in artificial saliva at 36.5 degrees C (pH = 7.0) to measure the corrosion potential and self-corrosion current density. With X-ray photoelectron spectroscopy, the element content was analyzed.

RESULTSIt was found that the dot corrosion voltage of Ni-Cr was -390 mv, and passivation voltage -160 mv. The area of active dissolvation was from -160 mv to -270 mv. The self-corrosion current density is 0.262 micro Acm(-2). From XPS, the content of Ni, Cr, Mo, Fe was increasing gradually, and the content of O, C was decreasing gradually. The content of Ca decreased because Ca existed in the artificial saliva.

CONCLUSIONAfter polarization curve test, Ni-Cr alloy would occur corrosive reaction, and the corrosion product would attach to the surface of the material.

Chromium Alloys ; chemistry ; Corrosion ; Electrochemistry ; In Vitro Techniques ; Nickel ; chemistry ; Saliva, Artificial ; chemistry

This assay was made to investigate the extractible properties of PDLLA under different extraction conditions. The ratio of test sample to extraction medium was 0.2 g to 1 ml. The distilled water, artificial saliva, Eagle's MEM and hexane were selected respectively as the extraction medium. The samples were extracted under 37 degrees C 24 h, 72 h, 1 w, 2 w and 3 w; 50 degrees C 72 h; 70 degrees C 24 h and 72 h; 121 degrees C 1 h. By use of gas chromatography, the ethyl alcohol, xylene and ethyl acetate content were measured. The results showed the ethyl alcohol content < 1.998 ug/ml, xylene contents was < 53.39 ug/ml and ethyl acetate content < 3.647 ug/m of PDLLA in distilled water, artificial saliva and Eagle's MEM under the condition of 37 degrees C from 24 h to 3 w. The ethyl alcohol content and xylene content in hexane were higher than those in the other three aqueous solutions. When the extracted temperature was increased, the contents of above three components were kept at the original level. There was almost no difference in the extractible properties of PDLLA among distilled water, artificial saliva and Eagle's MEM. The results did not change even if the extraction time and temperature were increased. It is a new concept to evaluate the safety of biomaterials by combining chemical and biological extraction tests, which will be significance in narrowing the gap between physical-chemical tests and biological tests for medical devices.
Biocompatible Materials ; chemistry ; Hexanes ; Lactic Acid ; chemistry ; Polyesters ; Polymers ; chemistry ; Saliva, Artificial ; Solubility ; Solutions ; Water

In forensic physical evidence identification, the accurate identification of the individual origin and their body fluid composition of the biological samples obtained from the crime scene play a critical role in determining the nature of a crime. In recent years, RNA profiling has become one of the fastest developing methods for body fluids identification. Due to the characteristics of tissue or body fluid specific expression, various types of RNA markers have been proven to be promising candidate markers for body fluids identification in previous studies. This review summarizes the research progress of RNA markers in body fluids identification, including the RNA markers that have been effectively verified in current research and their advantages and disadvantages. Meanwhile, this review prospects the application of RNA markers in forensic medicine.
Forensic Medicine/methods* ; Body Fluids/chemistry* ; RNA/analysis* ; Feces ; Forensic Genetics ; Semen/chemistry* ; Saliva/chemistry*

HIV Antibodies ; chemistry ; HIV Infections ; diagnosis ; Humans ; Pharmacies ; Pilot Projects ; Reagent Kits, Diagnostic ; Saliva ; chemistry

OBJECTIVETo investigate the effect of pH value and fluoride ions on the corrosion resistance of pure Ti and Ni-Cr-Ti alloy in the artificial saliva.

METHODSElectrochemical technique was used to measure the electric potential of corrosion (Ecorr), current density of corrosion (Icorr) and polarization resistance (Rp) of pure titanium and Ti-Ni-Cr alloy in the artificial saliva with different pH value and fluoride concentrations. After electrochemical analysis, microstructure and phase diffraction were examined by FSEM.

RESULTSWith the lower pH value, the Ecorr and Icorr of pure titanium and Ti-Ni-Cr alloy increased, the Rp decreased, there was a significant difference (P<0.05). The Ecorr and Icorr increased markedly, the Rp significantly reduced in the artificial saliva containing 0.2% NaF (P<0.01). FSEM showed that pure titanium and Ti-Ni-Cr alloy surface corrosion, pure titanium in the artificial saliva containing 0.2% NaF was most serious.

CONCLUSIONLower pH value decreases the corrosion resistance of pure titanium and Ti-Ni-Cr alloy and the artificial saliva containing fluoride ions decreases the corrosion resistance of pure titanium.

Chromium Alloys ; chemistry ; Corrosion ; Dental Alloys ; chemistry ; Electrochemistry ; Fluorides ; chemistry ; Hydrogen-Ion Concentration ; Materials Testing ; Metal Ceramic Alloys ; chemistry ; Nickel ; chemistry ; Saliva, Artificial ; chemistry ; Surface Properties ; Titanium ; chemistry

OBJECTIVES: To establish a system for simultaneous detection of miR-888 and miR-891a by droplet digital PCR (ddPCR), and to evaluate its application value in semen identification. METHODS: The hydrolysis probes with different fluorescence modified reporter groups were designed to realize the detection of miR-888 and miR-891a by duplex ddPCR. A total of 75 samples of 5 body fluids (including peripheral blood, menstrual blood, semen, saliva and vaginal secretion) were detected. The difference analysis was conducted by Mann-Whitney U test. The semen differentiation ability of miR-888 and miR-891a was evaluated by ROC curve analysis and the optimal cut-off value was obtained. RESULTS: There was no significant difference between the dual-plex assay and the single assay in this system. The detection sensitivity was up to 0.1 ng total RNA, and the intra- and inter-batch coefficients of variation were less than 15%. The expression levels of miR-888 and miR-891a detected by duplex ddPCR in semen were both higher than those in other body fluids. ROC curve analysis showed that the AUC of miR-888 was 0.976, the optimal cut-off value was 2.250 copies/μL, and the discrimination accuracy was 97.33%; the AUC of miR-891a was 1.000, the optimal cut-off value was 1.100 copies/μL, and the discrimination accuracy was 100%. CONCLUSIONS In this study, a method for detection of miR-888 and miR-891a by duplex ddPCR was successfully established. The system has good stability and repeatability and can be used for semen identification. Both miR-888 and miR-891a have high ability to identify semen, and the discrimination accuracy of miR-891a is higher.
Female ; Humans ; Body Fluids/chemistry* ; MicroRNAs/analysis* ; Real-Time Polymerase Chain Reaction/methods* ; Saliva/chemistry* ; Semen/chemistry* ; Male