Body Fluids ; chemistry ; metabolism ; Humans ; Meridians

The electrochemical mechanism of austenitic stainless steel (SUS316L and SUS317L) coronary stents in flowing artificial body fluid has been investigated with electrochemical technologies. The results indicated that the flowing medium coursed the samples' pitting potential Eb shift negatively, increased the pitting corrosion sensitivity, accelerated its anodic dissolution, but had little effects on repassivated potential. The flowing environment had great effects on cathodic process. The oxygen reaction on the samples' surface became faster as the cathodic process was not controlled by oxygen diffusion but by mixed diffusion and electrochemical process. With the increase of velocity of solution, the pitting corrosion becomes liable to occur under this circumstance.
Biocompatible Materials ; chemistry ; Body Fluids ; chemistry ; Corrosion ; Electrochemistry ; Materials Testing ; Stainless Steel ; chemistry ; Stents

All samples were divided into three groups and subjected to three different surface treatments, i.e. untreated group, group etched with mixed acid of 1:1 HCl and H2SO4 followed by immersion in 6N NaOH solution at 60 degrees C for 24 h and group etched with mixed acid of 1:1 HCl and H2SO4 followed by immersion in 6N NaOH solution at 60 degrees C for 24 h then heated at 600 degrees C for 1 h. After soaked in simulated body fluid for two weeks, a thin calcium phosphate coatings was precipitated on the surfaces of the two treated samples. Results of SEM and EDX showed that calcium phosphate coatings on the surfaces of the titanium samples etched and heated were more even than the titanium samples etched without heating. The analysis of XRD demonstrated the main component of calcium phosphate coating was hydroxyapatite.
Body Fluids ; chemistry ; Calcium Phosphates ; chemistry ; Coated Materials, Biocompatible ; chemistry ; In Vitro Techniques ; Materials Testing ; Titanium

High density, well ordered and uniform titanium oxide nanotube arrays were fabricated on the surface of titanium substrate by anodic oxidation in 0.5 mol/L H3P04 + 0. 138 mol/L NaF solution. Then hydroxyapatite coatings were deposited in a simulated body fluid (SBF). The morphology of titanium oxide nanotubes and the coatings was observed by means of scanning electron microscope (SEM). The phase composition of the coatings was determined by X-ray diffractometer (XRD). The phenomenon of polarization was studied by the CHI660A Electrochemical Workstation. The titanium oxide nanotube was found to be about 100 nm in diameter. The result of the samples soaked in SBF showed that the hydroxyapatite coatings were precipitated on the nanotube of titanium oxide.
Body Fluids ; chemistry ; Coated Materials, Biocompatible ; Durapatite ; chemistry ; Nanotubes ; Titanium ; chemistry

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*

The sectional test was adopted in this study to investigate the corrosion of pure iron in 0.15 mol/L NaCl solution, Ringer solution, PBS(-) solution, SBF solution and M199 cell culture medium at three different times. The result shows that different mediums have different corrosion effects on pure iron. The arrangement according to the medium's corrosion ability from the strongest to weakest is 0.15 mol/L NaCl solution (Ringer solution), PBS(-) solution, SBF solution and M199 cell culture medium. The results of scanning electron microscopy and energy dispersive X-ray spectrum analyses show that the addition of HPO4(2-), H2POC4-, Ca2+, Mg2+, SO4(2-) and the organic component can inhibit the corrosion to some degree.
Biocompatible Materials ; chemistry ; Body Fluids ; metabolism ; Corrosion ; Iron ; chemistry ; Isotonic Solutions ; chemistry ; Materials Testing ; Sodium Chloride ; chemistry

AIM AND METHODSNew method to analyse nitrate and nitrite concentrations in saliva, serum and urine was developed using high performance liquid chromatography.

RESULTSThe whole isolation process was completed in less than 7 minutes, the determination linearity of nitrate and nitrite were 0.7 ng-100 ng and 5 ng-100 ng, respectively. MINIMUM: Detectable limits of nitrate and nitrite were 0.3 ng and 2 ng, respectively. Nitrate recovery ratio was 99%-102% and nitrite recovery ratio was 99%-104%. The RSD of nitrate and nitrite was 0.8% and 1.7%, respectively.

CONCLUSIONIn comparison with other methods available, the present method seems to be simpler, more sensitive and specific.

The pathogenesis of endometriosis is not well understood at the moment, and the lack of effective biomarkers often leads to delayed diagnosis of the disease. Lipidomics provides a new approach for the diagnosis and prediction of endometriosis. Sphingomyelin, phosphatidylcholine and phosphatidylserine in peripheral blood, endometrial fluid, peritoneal fluid and follicular fluid have good diagnostic value for endometriosis and disease classification; the lipid metabolites in the eutopic endometrium tissue are expected to be biomarkers of early endometriosis; and the lipid metabolites in peripheral blood are also of great value for predicting endometriosis-related infertility. The development of lipidomics technique will further advance the progress on the pathogenesis, prediction, diagnosis and treatment of endometriosis.
Biomarkers/blood* ; Blood Chemical Analysis/trends* ; Body Fluids/chemistry* ; Endometriosis/diagnosis* ; Female ; Humans ; Lipidomics/trends*

OBJECTIVES: To establish a rapid and nondestructive identification method for human body fluid stains and non-biological stains using three-dimensional fluorescence spectroscopy. METHODS: The collected three-dimensional fluorescence spectrum data of human saliva, 3% blood, coffee and Fanta^® stains were processed with dimensionality reduction. After wavelet transform, spectral denoising and feature extraction, the classification formula was established. The Fisher discriminant was used for spectrum matching and recognition to establish the analysis method to distinguish stain types. RESULTS: According to the results of data training and comparison, all the recognition accuracies of Fanta^®, coffee, saliva and blood were more than 91.39%. Among them, saliva reached 100% recognition accuracy. CONCLUSIONS Three-dimensional fluorescence spectroscopy is a potential method for rapid and nondestructive identification of biological and non-biological stains.
Humans ; Forensic Medicine/methods* ; Coloring Agents/analysis* ; Coffee ; Spectrometry, Fluorescence ; Body Fluids/chemistry*

Diabetic ketoacidosis is a serious complication results from the high blood levels of glucose and ketone in diabetes mellitus patients that cause metabolic overbalance. An analysis of postmortem biochemical indexes is needed in such cases without specific signs of the routine forensic medicine examination. Postmortem biochemistry is a kind of examinations that collecting the body fluids of the corpses to determine the metabolic state of their life time to estimate the cause of death. This paper reviews the basic features and signs of the forensic medicine examination in the dead cases of diabetic ketoacidosis, and emphatically analyzes the postmortem biochemical indexes of diabetic ketoacidosis, and summarizes new ideas of forensic medicine diagnosis in diabetic ketoacidosis death.
Autopsy ; Body Fluids/chemistry* ; Diabetic Ketoacidosis/diagnosis* ; Forensic Medicine ; Forensic Pathology ; Humans