ObjectiveTo study the effect of music exposure in juvenile stage on anxiety-like behavior and fear extinction in adult rats.Methods4 broods of two-week-old healthy Sprague-Dawleyda rats were separated into two groups randomly.The music groups were exposed to music from 20:00 to 22:00 for 21 consecutive days.When the rats were 5 weeks old,they were caged by sex,with 8 male rats and 6 female rats in each group.When the rats were 8 weeks old,the two groups were assessed in the elevated-plus maze test,the open-field test,trained and assessed by the conditional fear training and fear extinction training.ResultsIn the elevated-plus maze test:Prior to the foot shock,the percent of time spent in the open arms in the music group (female(7.07 ± 1.14)％,male (5.12 ± 1.95 ) ％ ) exhibited no significant difference (P＞ 0.05 ) comparing with the rats in the control group (female (4.65 ± 0.86 ) ％,male ( 4.86 ± 1.95 ) ％ ).After the foot shock,the percent of time spent in the open arms in the music group ( female ( 8.63 ± 3.35 ) ％,male ( 7.79 ± 2.49 ) ％ ) increased comparing to the control group (female(1.48 ±0.11)％,male(4.29 ± 1.68)％) (P＜0.01). In the open-field test:prior to the foot shock,the percent of time spent in the center zone of the music group ( female (6.16 ± 2.17 ) ％,male (6.25 ±3.47) ％ ) exhibited no significant difference (P＞ 0.05) comparing with the rats in control group (female(5.27 ±1.95 )％,male (6.22 ± 3.13 )％ ).After the foot shock,the percent of time spent in the center zone in the music group (female(8.52 ± 1.93) ％,male (6.95 ± 2.46 ) ％ ) was larger than the control group ( female ( 3.47 ±0.93 ) ％,male (4.36 ± 2.22 ) ％ ) (P ＜ 0.05 ).The fear extinction training showed that the percent of freezing time exhibited no significant difference between the male and female rats of the music group and control group in the first block of the first extinction training day and the percentage of freezing time of female rats in music group was significantly lower than that of female rats in control group on the third extinction training day.The percentage of freezing time of male rats in the music group was significantly lower than that of male rats in control group on the second and third training day.ConclusionMusic exposure in juvenile stage decreases the anxiety level after foot shock,and promotes the long-term fear extinction,while has no effect on the level of fear memory.

Objective To investigate CT features of primary ileocecum lymphoma (PIL),to improve the ability of CT diagnosis for the disease.Methods CT data of 12 patients with PIL confirmed by surgery and pathology were analyzed retrospectively.All of the patients underwent plain CT, and 8 cases of them also underwent enhanced CT.Results Among the 12 cases of PIL, there were mass type in 2 and diffused thickness type in 10.The length of the intestinal lesions ranged from 7.8 to 18.5 cm (mean 10.2 cm).Lumen was irregular or aneurysmal dilation in 9, and obvious stenosis in 3.Intestinal wall was soft in 10,and rigid in 2.Plain CT showed that the thickened intestinal wall was soft tissue density.Among the 8 cases performed enhanced CT,6 were approximately homogeneous enhancement, and 2 had small necrosis area without enhancement.Maximum intensity projection(MIP) displayed the lesion had blood supply from the branches of the superior mesenteric artery.Enlarged lymph nodes were detected around the lesions, in root of the mesentery, and in the retroperitoneum in 9.1 case was accompanied with intestinal obstruction,1 case was accompanied with intestinal perforation.Conclusion If CT examination found a homogeneous soft tissue mass in ileocecum with long extent, lumen dilation, soft intestinal wall,mild-to-moderate delayed homogeneous enhancement, PIL should be considered.

Objective To explore the CT and MRI features of chordoma and analysis misdiagnosis.Methods The CT and MRI imaging data were analyzed retrospectively in 1 8 patients with chordoma.The imaging findings of the preoperative misdiagnosed lesions were analyzed and summarized.Results 1 2 cases were diagnosed correctly preoperatively,6 cases were misdiagnosed.Chordoma was located in the skull base in 9 cases,in the sacrum in 8 cases,and in cervical vertebrae in 1 case.CT and MRI showed oval or round shape lesions in 12,and irregular shape in 6.14 cases of them displayed clear boundary,4 cases displayed unclear boundary.CT showed soluble osseous bone destruction and uneven isodensity or slightly low density mass.Spot or lamellar shaped calcifications or residual substances of bone were found around or inside of the lesions in 9 cases.MRI showed equal or low signal intensity on T1 WI and high signal intensely on T2 WI.After the CT and MRI contrast enhancement,mass showed mild-to-moderate heterogeneity enhancement. Conclusion Chordoma has certain characteristics on CT and MRI imaging.The combination use of CT and MRI scans has an important value in localization quantitative and qualitative diagnosis of chordoma.

Photoautotrophic gametophyte cells of the brown macroalgae Laminaria japonica were cultivated in 500ml stirred tank photobioreactors under seven pulse feeding modes and one batch mode.It is the first time for the study of effects of the feeding time points and feeding quantity on macroalgal cell growth and nutrient consumption.Results showed that, with inoculum density of 50mg DCW/L, in modified APSW artificial seawater medium at 13℃, light intensity of 60μE/m2.s, light cycle of 16/8h L/D, aeration rate of 50ml/min, and agitation speed of 100r/min, feeding the culture with small nutrient quantity was beneficial for the synchronization between nitrate and phosphate absorption, and further for biomass production.Feeding when ambient nutrient was abundant or depleted was quite weak for large amount of biomass accumulation, which might be due to the slowing nutrient absorption, nutrient storage, or the divergence absorption between nitrate and phosphate.Feeding nutrient frequently with small quantity from mid-exponential growth of macroalgal cells, that is maintaining medium nutrient concentration between 1/3 and 1/2 of its initial concentration, was the most effective way for biomass production, with biomass increased by 12.270 times of for 51 days' cultivation.

Laminaria japonica gametophytic cells were cultivated in a photobioreactor under continuous shear stress (0-1000 r/min) in 60 hours and the following static cultivation within 23.5 days. The content of chlorophyll a reached the maximum value of 2.36 mg/L at the end of continuous shear stress when the agitation speed was 90 r/min, while the chlorophyll a (chl a) concentration decreased quickly and nitrogen and phosphorus were released under high shear force (270-1000 r/min). The cell injury ratio at 1000r/min was as 18 times as that of the control. During the recovery course, gametophytic cells showed themselves distinct recovery capability at all agitation speeds. Furthermore, the content of chl a is a more exact index as biomass than dry cells weight (DCW). Besides cell injury ratio, the liberation of phosphorus demonstrates the cells injury.
Bioreactors ; Cell Culture Techniques ; Gametogenesis ; physiology ; Germ Cells ; physiology ; Laminaria ; growth & development ; radiation effects ; Light ; Shear Strength ; Stress, Mechanical

Eleven compounds were isolated from the culture of Streptomyces sp. CPCC 202950 by a combination of various chromatographic techniques including column chromatography over macroporous resin HP-20, MCI, and reversed-phase HPLC. Their structures were identified as 1H-pyrrole-2-carboxamide(1),5'-deoxy-5'-methylthioinosine(2), vanillamide(3), trans-3-methylthioacrylamide(4), 1,2,3,4-Tetraydro-1H-pyrido[3,4-b]indole-3-carboxylic acid(5), cyclo(L-pro-L-tyr) (6), N-[2-(4-hydroxyphenyl)]ethylacetamide(7), benzamide (8), cyclo ('L-leucyl-trans-4-hydroxy-L-proline)(9), cyclo-(Phe-Gly) (10), and tryptophan (11). Among them, compounds 1 and 2 were new natural products. In the preliminary assays, none of the compounds exhibited obvious inhibition of HIV-1 protease activity (IC50 > 10 micromol x L(-1)).
Culture Media ; chemistry ; metabolism ; HIV Protease ; analysis ; HIV Protease Inhibitors ; chemistry ; isolation & purification ; Molecular Structure ; Spectrometry, Mass, Electrospray Ionization ; Streptomyces ; chemistry ; metabolism

By using a cell-based high throughput screening model for the CLA-1 up-regulator, Streptomyces 203909 was found to produce up-regulator of CLA-1. A novel trichostatin analogue was isolated from the rice fermentation of Streptomyces sp. CPCC 203909by a combination of various chromatographic techniques including column chromatography (CC) over silica gel, flash C18 CC, and reversed-phase HPLC. Its structure was identified as (-)-(R,2E,4Z)-7-[(4'-dimethylamino) phenyl]-4,6-dimethyl-7-oxohepta-2,4-dienoyl-L-glutamine (1) by the spectroscopic and chemical methods, and combination with the CD spectroscopy and Marfey's method. In the prelimi- nary assays, Compound 1 showed cytotoxicity against human embryonic kidney 293 cell line with IC50 value 35.3 [µmol · L(-1).
Cell Survival ; drug effects ; Fermentation ; Hep G2 Cells ; Humans ; Hydroxamic Acids ; chemistry ; isolation & purification ; metabolism ; pharmacology ; Molecular Structure ; Streptomyces ; chemistry ; metabolism

OBJECTIVETo establish the biological exposure limit values of urinary S-phenylmercapturic acid (SPMA) for assessing occupational exposure to benzene.

METHODSStudy participants were selected from 55 workers of benzene exposures below 32.5 mg/m(3). The concentration of personal exposure to benzene was measured by gas chromatography and sampled with personal sampler. The urine samples were collected at the end of work shift and individual internal exposure level was evaluated by determination of SPMA in urine by HPLC/MS method. Comparison of external and internal exposure was assessed by the relative internal exposure (RIE) index.

RESULTSThe benzene exposure level ranged from 0.71 to 32.17 mg/m(3) (geometric mean 6.98 mg/m(3), median 7.50 mg/m(3)). The urinary SPMA at the end of the work shift were significantly correlated with benzene exposure, (microg/g Cr) = -8.625 + 18.367X (mg/m(3)), r = 0.8035, (P < 0.01). According to the occupational exposure limit for benzene in China and calculation of regression equation, the expected value of urinary SPMA was 101.58 microg/g Cr. Mean level of biotransformation of per mg/m(3) benzene to urinary SPMA was 18.23 microg/g Cr and the metabolic efficiencies of benzene transformation to urinary SPMA decreased with benzene exposure increased.

CONCLUSIONBased on abroad documents and data, biological limit value for occupational exposure to benzene in China is recommended as follows: 100 microg/g Cr (47 micromol/mol Cr) for SPMA in the urine at the end of shift.

Acetylcysteine ; analogs & derivatives ; urine ; Adult ; Benzene ; adverse effects ; analysis ; Benzene Derivatives ; urine ; China ; Humans ; Middle Aged ; Occupational Exposure ; adverse effects ; analysis ; Threshold Limit Values ; Young Adult

Objective To compare three different types of donor livers (C-Ⅰ,C-Ⅱ,C-Ⅲ) in clinical efficacy,complications and survival rate of liver transplantation.Methods Using the retrospective descriptive study method,the clinical data of 422 patients undergoing liver transplantation,including 124 cases of C-Ⅰ,81 cases of C-Ⅱ and 81 cases of C-Ⅲ in recent 6 years (from June 2010 to June 2016) were analyzed.The same surgical method was performed with piggyback liver transplantation.Observation indicators contained (1) recipient postoperative liver function;(2) the postoperative complications;(3) the recipient survival rate.SPSS 19.0 statistical software was used for analysis.Results (1) The curative effect was evaluated by the changes of ALT and TBIL among three groups of recipients postoperatively.As compared with C-Ⅰ transplantation group and CⅢ transplantation group,the level of ALT in C-Ⅱ transplantation group was significantly increased (P ＜0.05),the clinical efficacy was poorer.(2) The incidence of PNF was 3.23％ in C-Ⅰ group,9.88％ in C-Ⅱ group and 9.88％ in C-Ⅲ group (P＜0.05).The incidence of acute rejection was respectively 9.68％ in C-Ⅰ group,38.27％ in C-Ⅱ group and 38.27％ in C-Ⅲ group (P＜0.001).The incidence of SIRS was respectively 5.65％ in C-Ⅰ group,39.50％ in C-Ⅱ group and 39.50％ in C-Ⅲ group (P＜ 0.001).There were significant differences in the incidence of other complications among the three groups.(3) There were 14 deaths within 3 months,accounting for 17.28％,and the survival rate was 82.72％ in C-Ⅱ group,the 1-,3-,and 5-year survival rate was 76.55％,74.18％ and 76.55％ respectively in C-Ⅰ group,and that was 88.02％,85.72％ and 81.11％ respectively in C-Ⅲ group.Conclusion Since June 2015,C-Ⅰ donors grow up more quickly on year-on-year basis than C-Ⅱ.Simultaneously,the sort-term and long-term clinical efficacy is better in C-Ⅰ transplantation group than in C-Ⅱ transplantation group.How to repair the three types of Chinese standard donor organs and optimize the quality is still a hot point to ensure the healthy development of organ transplantation in China,which needs further investigation.

OBJECTIVETo investigate the risk factorsthat predict pain during colonoscopy for decision of sedation or analgesia before the examination.

METHODSA total of 283 consecutive patients undergoing colonoscopicexamination at Nanfang Hospital between July, 2016 and September, 2016were retrospectively analyzed. The clinical data and visual analogue scale after the examination were analyzed to identify the risk factors for pain during colonoscopy using univariate analysis and multivariate logistic regression. A risk stratification model for predicting pain in colonoscopy was established.

RESULTSThe completion rate of the procedure was significantly lower in patients with a visual analogue scale ≥5 (P<0.000). Univariate analysis showed that female patients, previous abdominal surgery, no previous experience with colonoscopy, complaint of abdominal pain before colonoscopy, insufficient experience of the endoscopists, patient's anticipation of high painlevelbefore examination, and a low body mass index (BMI) were all associated with the experience of pain in colonoscopy (P<0.05). Multivariate logistic regressionanalysis identified BMI index (X), level of experience of the endoscopist (A, A, A) and the patient's anticipation of painlevel (X) as the risk factors of pain in colonoscopy(P<0.05), and the establishedmodel with the 3 variables was: P=e/(1+e),Y=0.049-0.124×X-0.97×X+1.713×A+0.781×A+0.147×A, which showed a sensitivity of 70.3% and a specificity of 67.5%for predicting pain in colonoscopy.

CONCLUSIONThe patient's anticipation of a high pain level in colonoscopy, insufficient experience of the endoscopist, and a low BMI are the independent risk factors for pain in colonoscopy, and evaluation of these factors can help in the decision-making concerning the use of sedation or analgesia before colonoscopy.

Abdominal Pain ; etiology ; Analgesia ; Colonoscopy ; adverse effects ; Conscious Sedation ; Female ; Humans ; Male ; Pain Management ; Pain Measurement ; Retrospective Studies ; Risk Factors