Flavonoids are a class of important active ingredients in traditional Chinese medicine, pharmacological activity and in vivo process is the focus of research in recent years. Calycosin is the main active ingredients of flavonoids in Astragali Radix, recent studies indicate that it has many kinds of pharmacological activity, but the absorption and transport characteristics in vivo is unclear. The experiment using Caco-2 cell model, with apigenin as internal standard substance, using the method for the determination of drug concentration by HPLC, were studied at different concentrations and absorption transport characteristics of respectively adding different types of protein inhibitors. Data were analyzed by Q test, the results show that low, middle, high concentration of P(app)(BL-AP)/ P(app)(AP-BL) = 1.38 < 1.5, respectively adding different types of protein inhibitors, compared with the control group of P(app)(BL-AP)/ P(app)(AP-BL), there were no significant differences. Calycosin absorption may mainly passive transport, also involved in active transport mechanism, the transport may not be affected by the P-protein, MRP2 protein, SGLT protein.
Absorption ; Biological Transport ; Caco-2 Cells ; Chromatography, High Pressure Liquid ; Culture Media, Conditioned ; chemistry ; Drug Stability ; Drugs, Chinese Herbal ; analysis ; pharmacokinetics ; Humans ; Hydrogen-Ion Concentration ; Isoflavones ; analysis ; pharmacokinetics ; Models, Biological

OBJECTIVETo observe the effect of gastric dynamics by transcutaneous electrical acupoint stimulation (TEAS) combined general anesthesia when controlled hypotension dropped to 60% of the mean arterial prenssure (MAP) baseline, and to provide experimental evidence for organ protection in clinical controlled hypotension.

METHODSEighteen male beagles were randomly divided into three groups, the general anesthesia group (blank), the general anesthesia induced controlled hypotension group (control), and the general anesthesia combined TEAS induced controlled hypotension group (experiment), 6 in each group. Controlled hypotension was performed in the latter two groups with isoflurane inhalation and intravenous injection of sodium nitroprusside (SNP). The mean arterial pressure (MAP) was lowered to 60% of the MAP baseline and kept for 60 min. Controlled hypotension was not performed in Beagles of the control group. For Beagles in the experiment group, TEAS [2/100 Hz, (4 ± 1) mA] was applied to bilateral Hegu (LI4), Quchi (LI11), Zusanli (ST36), and Sanyinjiao (SP6) from stable physiological conditions to the end of maintaining stages. Changes of EGG frequencies and EGG amplitudes were monitored. Serum levels of gastrin (GAS) and motilin (MTL) were also detected at corresponding time points during and after experiment.

RESULTSAs for the pressure control effect of TEAS combined general anesthesia in the controlled hypotension, during the process of controlled hypotension (T1-T4), MAP levels of two controlled pressure groups remained relatively stable, and were kept at 60% of the MAP baseline. When the blood pressure dropped to the target low MAP and maintained at 60 min (T1-T4), EGG amplitudes of Beagles in all the three groups showed decreasing tendency. But it was more obviously lower than its basic level in the control group (P <0.05), while it was not obviously decreased in the experiment group (P < 0.05). EGG frequencies of Beagles in all the three groups showed no obvious change during this stage. By the end of the MAP rising stage (T8), the EGG amplitude of the experimental group was significantly higher than that of the control group and the blank group (P < 0.05), while it didn' t show any obvious increase in the control group. During this period, EGG frequencies of the two controlled hypotension groups decreased more than those of the blank group. Two h after rising blood pressure (at T9), EGG amplitudes and frequencies in the two controlled hypotension groups basically restored to their respective baselines and levels of the blank group at T9. At 2 h (T9) after controlled hypotension, serum levels of GAS and MTL were lower than those of basic levels in the two controlled hypotension groups (P <0.05). However, serum levels of GAS and MTL had an increasing trend in the two controlled hypotension groups at 24-72 h (T10-T12). Besides, the increasing speed and amplitude was better in experiment group than in the control group at T10-T12. However, there was no statistical difference between the two groups (P > 0.05). At 72 h (T12) serum levels of GAS and MTL had basically restored to their basic levels in the two controlled hypotension groups and that of the blank control group.

CONCLUSIONEGG amplitudes could be effectively improved in TEAS combined general anesthesia for controlled hypotension at 60% of the MAP baseline, the recovery of the serum GAS level accelerated, gastric power improved and stomach protected.

Acupuncture Points ; Anesthesia ; methods ; Anesthesia, General ; Animals ; Arteries ; Dogs ; Gastrins ; Hypotension, Controlled ; Male ; Motilin ; Nitroprusside ; Transcutaneous Electric Nerve Stimulation

Objective:To explore a crown form classification method for upper central incisor which is more objective and scientific than traditional classification method based on the standardized photography technique.To analyze the relationship between crown form of upper central incisors and papilla filling in periodontally healthy Chinese Han-nationality youth.Methods:In the study,180 periodontally healthy Chinese youth (75 males,and 105 females )aged 20 -30 (24.3 ±4.5)years were included.With the standardized upper central incisor photography technique,pictures of 360 upper central incisors were ob-tained.Each tooth was classified as triangular,ovoid or square by 13 experienced specialist majors in prothodontics independently and the final classification result was decided by most evaluators in order to ensure objectivity.The standardized digital photo was also used to evaluate the gingival papilla filling situation.The papilla filling result was recorded as present or absent according to naked eye observation. The papilla filling rates of different crown forms were analyzed.Statistical analyses were performed with SPSS 19.0.Results:The proportions of triangle,ovoid and square forms of upper central incisor in Chinese Han-nationality youth were 31.4% (113 /360),37.2% (134 /360)and 31.4% (113 /360 ), respectively ,and no statistical difference was found between the males and females.Average κvalue be-tween each two evaluators was 0.381.Average κvalue was raised up to 0.563 when compared with the final classification result.In the study,24 upper central incisors without contact were excluded,and the papilla filling rates of triangle,ovoid and square crown were 56.4% (62 /110),69.6% (87 /125 ), 76.2% (77 /101)separately.The papilla filling rate of square form was higher (P =0.007 ).Conclu-sion:The proportion of clinical crown form of upper central incisor in Chinese Han-nationality youth is obtained.Compared with triangle form,square form is found to favor a gingival papilla that fills the inter-proximal embrasure space.The consistency of the present classification method for upper central incisor is not satisfying,which indicates that a new classification method,more scientific and objective than the present one,is to be found.

Adult ; Colonic Neoplasms ; genetics ; DNA, Neoplasm ; genetics ; Female ; Fluorescence ; Humans ; Male ; Microsatellite Instability ; Middle Aged ; Polymerase Chain Reaction ; methods ; Rectal Neoplasms ; genetics

OBJECTIVETo establish a convenient, objective and applicable method to assess gingival biotype using periodontal probing.

METHODSA total of 66 maxillary anterior teeth from 14 volunteers (6 males, 8 females) with healthy gingiva, aged from 20 to 30 years, were recruited in this study. The gingival biotypes were evaluated by whether or not the outline of the periodontal probe was clear inside the gingiva. Gingival thickness of the cemento-enamel junction (CEJ) in upper anterior teeth was measured by cone-beam CT (CBCT).

RESULTSThe method of periodontal probing-assessed gingival biotype had good consistency and repeatability. The result of probing-assessed gingival biotype was consistent with that obtained by CBCT. The mean thickness of gingiva in thin, compromised and thick gingival biotype was (1.02 ± 0.20), (1.28 ± 0.25) and (1.46 ± 0.25) mm. These differences were significant for all three comparisons (P = 0.001, respectively).

CONCLUSIONSPeriodontal probing-assessed gingival biotype is a simple, relatively objective and suitable method for clinical examination.

Adult ; Cone-Beam Computed Tomography ; Female ; Gingiva ; anatomy & histology ; diagnostic imaging ; Humans ; Male ; Periodontal Index ; Periodontics ; instrumentation ; Tooth Cervix ; diagnostic imaging ; Young Adult

Objective To investigate the features of the fill of interdental spaces by gingival papillae and the associated factors.Methods Fifteen volunteers with healthy gingiva were involved in this study.The height and thickness on the alveolar crest level of 62 maxillary anterior papilla were measured radiographically with cone-beam computed tomography(CBCT) scans.A standardized periodontal probe with Williams markings was used for measurements of the papilla width on the alveolar crest level.Results When the papilla was complete fill interdentally,the mean height of papillary tissue on the alveolar crest level (equal to contact point-bone crest) was (3.67 ± 0.51) mm.The mean thickness of papilla on the alveolar crest level was (8.38 ± 0.75) mm.The papilla height had a positive correlation with papilla thickness (r =0.433,P ＜ 0.001).Conclusions The cone-beam computed tomography can be used for clear visualization of the papilla profile and the measurements of papilla height and thickness.Thicker and wider tissue was associated with an increased likelihood of having a complete papilla fill.

OBJECTIVETo investigate the intervention effect of transcutaneous electrical acupoint sitmulation (TEAS) on heart under limiting level of controlled hypotension.

METHODSEighteen male Beagles were randomly divided into a general anesthesia group, a control group and an experimental group, 6 dogs in each group. All animals were applied with general anesthesia, and the animals of the control group and the experimental group were administered with combination of isoflurane and sodium nitroprusside (SNP) for controlled hypotension to 30% mean arterial pressure (30% MAP) of base line for 60 min. In the experimental group, TEAS (2 Hz/100 Hz, 6-8 mA) was applied to "Hegu" (LI4), "Zusanli" (ST 36), "Sanyinjiao" (SP 6) and "Quchi" (LI 11) from the beginning of physiological conditions stability to the end of maintained low MAP for 60 min. Creatine kinase isoenzymes MB (CK-MB) and lactate dehydrogenase (LDH) activity were detected at the base line and 2 h, 24 h, 48 h, 72 h after operation. Total superoxide dismutase (T-SOD) and malondialdehyde (MDA) in myocardium were observed at 72 h after operation.

RESULTSThe peak of LDH arrived at 24 h after operation and then restored in 3 groups. Compared with basal level, the activity of LDH in controlled group at 72 h after operation was significantly increased (P < 0.05), and in the other two groups no obvious change (P > 0.05). The activity of CK-MB arrived to peak from 2 h to 24 h after operation, and then came back gradually in 3 groups. Compared with postoperative 72 h of the same group, the control group at 48 h significantly increased (P < 0.05), while the other two groups had no statistically significant difference (P > 0.05). The content of MDA at 72 h after operation in controlled group was higher significantly than that in the general anesthesia group and the experimental group (both P < 0.05).

CONCLUSIONTEAS combined with anesthesia for controlled hypotension can elevate myocardial effect of anti-oxide free radical, reduce the postoperative release of LDH and CK-MB, so as to produce myocardial protection.

Acupuncture Points ; Anesthesia, General ; Animals ; Apoptosis ; Dogs ; Heart ; physiopathology ; Humans ; Hypotension, Controlled ; Male ; Malondialdehyde ; metabolism ; Myocardium ; cytology ; metabolism ; Oxidative Stress ; Transcutaneous Electric Nerve Stimulation

Biomacromolecules participate in various kinds of vital processes. Observing and analyzing their structural dynamic and the dynamic processes of intermolecular interaction at molecular level is important for understanding the action mechanism. Since its advent, single molecular fluorescence resonance energy transfer (SM-FRET) has demonstrated its great potential in studying the conformational change and interaction process of biomacromolecules, and a series of new mechanisms have been revealed. This review summarized recent progresses of SM-FRET in studying protein structural dynamic, nucleic acid structural dynamic, protein-protein and protein-nucleic acid interactions.

This paper introduced the work principle, execution, use and major characteristics of the remote hydraulic pressure control injection. Using Pascal principle, it is more accurate, convenient, cheap and safe. It could be used in all the fields of the medicine.
Equipment Design ; Injections ; Telemedicine ; instrumentation

Aged ; Carcinoma, Merkel Cell ; diagnosis ; surgery ; Female ; Humans ; Skin Neoplasms ; diagnosis ; surgery ; Thigh