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Group Replacement-Rearrangement-Triggered Linear-Assembly Nonaqueous Precipitation Synthesis of Hydroxyapatite Fibers. ACS Biomater Sci Eng 2023; 9:4597-4606. [PMID: 37414458 DOI: 10.1021/acsbiomaterials.3c00286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/08/2023]
Abstract
A novel method for hydroxyapatite fiber preparation with highly large-scale production prospects is of paramount importance but remains particularly difficult. Here, group replacement-rearrangement-triggered linear-assembly nonaqueous precipitation synthesis has been proposed for hydroxyapatite fibers under mild conditions. Pure hydroxyapatite fibers can be fabricated taking disodium hydrogen phosphate, calcium acetate, and glycerol as the phosphorus source, calcium source, and solvent, respectively. Single hexagonal crystal structures of hydroxyapatite fibers growing along the c-axis and preferential growth of the (002) crystal plane similar to the layered stacking structure of an adult bone have been confirmed by XRD refinement tests and calculation, TEM electron diffraction calibration, and FE-SEM. Highly active carbonate apatite is further demonstrated by EDS, FT-IR, Raman spectroscopy, and XPS. Unsaturated P-O and O-Ca bonds at both ends of the hexagonal-sheet assembly unit in a high-polarity nonaqueous glycerol environment without strongly coordinated OH- confirm the solution spontaneous linear assembly to form the single hydroxyapatite fibers.
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Photolysis frequency of nitrophenols derived from ambient measurements. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 869:161810. [PMID: 36702278 DOI: 10.1016/j.scitotenv.2023.161810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 01/02/2023] [Accepted: 01/20/2023] [Indexed: 06/18/2023]
Abstract
Nitrophenols, a class of important intermediate products from the oxidation of aromatics, can participate in photochemistry and influence the atmospheric oxidative capacity. However, the reported photolysis frequencies of nitrophenols show considerable discrepancies. Here, measurements of nitrophenol, and methyl nitrophenol using a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) at both urban and regional sites in southern China are used to constrain photolysis frequencies of nitrophenols. Considerable concentrations with a campaign average of 58 ± 32 ppt for nitrophenol and 97 ± 59 ppt for methyl nitrophenol were observed at the regional site. Based on the in-situ measurement dataset, a steady-state calculation was performed along with a zero-dimensional box model to analyze the budgets of nitrophenols. The result indicates that both primary emission and photolysis have significant impacts on nitrophenols. Primary emission contributes up to 88 % of the total nitrophenols production while photolysis accounts for up to 98 % of the total removal rate. The dominant sink of nitrophenols is photolysis with a rate of about 3.5 % ± 1.3 % of jNO2 for nitrophenol and 2.4 % ± 1.0 % of jNO2 for methyl nitrophenol. The results of this study suggest that using advanced mass spectrometry to accurately measure ambient nitrophenols, supplemented by an observation-based box model for budget analysis, provides an important indication for determining photolysis rate constants of nitrophenols.
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Validation of a modified Caprini risk assessment model in lung cancer patients undergoing surgery: Results of a multicenter cross-sectional observational study. J Surg Oncol 2022; 125:933-942. [PMID: 35041203 DOI: 10.1002/jso.26794] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 11/24/2021] [Accepted: 01/01/2022] [Indexed: 02/05/2023]
Abstract
BACKGROUND AND OBJECTIVES Lung cancer patients slated for surgery are at high risk of venous thromboembolism (VTE). Precise risk assessment is necessary for providing proper thromboprophylaxis and reducing morbidity and mortality of VTE. METHODS A multicenter, observational, cross-sectional cohort study, involving patients with primary lung cancer undergoing surgery, was carried out from August 2016 to December 2019. All patients were assessed according to the Caprini risk assessment model (RAM) and a modified scoring system incorporating elevated D-dimer and new stratification of surgical time. The endpoint was confirmed VTE or patient discharge. RESULTS Out of 1205 patients, 87 (7.2%) were diagnosed with VTE. The area under the curve of modified scores for VTE was 0.759, which was larger than that of the original one (0.589) (p < 0.05). By modified Caprini scoring system, a higher score was associated with increased VTE risk (odds ratio [OR], 1.345; 95% confidence interval [CI], 1.197-1.512; p < 0.001), and there was an increased OR of 4.090 (95% CI, 2.472-6.768, p < 0.001) for VTE in high-risk category patients. CONCLUSION Modified Caprini RAM showed an improved prediction of high-risk patients with an elevated likelihood of postoperative VTE compared to the original one.
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A large-scale genome-wide association analysis reveals QTL and candidate genes for intramuscular fat content in Duroc pigs. Anim Genet 2021; 52:518-522. [PMID: 34060118 DOI: 10.1111/age.13069] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/10/2021] [Indexed: 01/30/2023]
Abstract
This study aimed at identifying genomic regions and genes associated with intramuscular fat content (IMF) in Duroc pigs using a weighted single-step GWAS. Data from 3912 pigs, of which 3770 animals were genotyped with GeneSeek Porcine 50K Bead chip, were used for the association analysis. We identified 19 genomic regions that each explained >1% of the additive genetic variance associated with IMF. Notably, a consistent QTL on SSC7 (117.42-117.92 Mb) was confirmed, explaining 3.70% of the additive genetic variance, and two genes, BDKRB2 and ATG2B, were highlighted as promising candidates for IMF. Two QTL (SSC7, 94.19-94.64 Mb; SSC14, 123.25-123.75 Mb), which harbored MED6 and MAP3K9 genes and TCF7L2 gene respectively, were newly identified as associated with IMF. In conclusion, we identified a consistent QTL and additional genomic regions and genes that contributed to the genetic variance of IMF using a large-scale sample size of genotyped pigs and genealogical information.
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A97 TOOLS FOR DIRECT OBSERVATION AND ASSESSMENT OF COLONOSCOPY: A SYSTEMATIC REVIEW OF VALIDITY EVIDENCE. J Can Assoc Gastroenterol 2021. [DOI: 10.1093/jcag/gwab002.095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
An increasing focus on quality and safety in colonoscopy has led to broader implementation of competency-based educational systems that enable documentation of trainees’ achievement of the knowledge, skills, and attitudes needed for independent practice. The meaningful assessment of competence in colonoscopy is critical to this process. While there are many published tools that assess competence in performing colonoscopy, there is a wide range of underlying validity evidence. Tools with strong evidence of validity are required to support feedback provision, optimize learner capabilities, and document competence.
Aims
We aimed to evaluate the strength of validity evidence that supports available colonoscopy direct observation assessment tools using the unified framework of validity.
Methods
We systematically searched five databases for studies investigating colonoscopy direct observation assessment tools from inception until April 8, 2020. We extracted data outlining validity evidence from the five sources (content, response process, internal structure, relations to other variables, and consequences) and graded the degree of evidence, with a maximum score of 15. We assessed educational utility using an Accreditation Council for Graduate Medical Education framework and methodological quality using the Medical Education Research Quality Instrument (MERSQI).
Results
From 10,841 records, we identified 27 studies representing 13 assessment tools (10 adult, 2 pediatric, 1 both). All tools assessed technical skills, while 10 assessed cognitive and integrative skills. Validity evidence scores ranged from 1–15. The Assessment of Competency in Endoscopy (ACE) tool, the Direct Observation of Procedural Skills (DOPS) tool, and the Gastrointestinal Endoscopy Competency Assessment Tool (GiECAT) had the strongest validity evidence, with scores of 13, 15, and 14, respectively. Most tools were easy to use and interpret and required minimal resources. MERSQI scores ranged from 9.5–11.5 (maximum score 14.5).
Conclusions
The ACE, DOPS, and GiECAT have strong validity evidence compared to other assessments. Future studies should identify barriers to widespread implementation and report on use of these tools in credentialing purposes.
Funding Agencies
None
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Management strategies in a thoracic surgery ward during COVID-19 pandemic: Experience from West China Hospital. World J Virol 2020; 9:47-53. [PMID: 33442536 PMCID: PMC7770468 DOI: 10.5501/wjv.v9.i4.47] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 08/03/2020] [Accepted: 09/02/2020] [Indexed: 02/06/2023] Open
Abstract
The coronavirus disease 2019 was first reported in Wuhan in December 2019 and then spread rapidly throughout the world. On March 11, 2020, the World Health Organization declared coronavirus disease 2019 a pandemic. In response to the pandemic, the management division of West China Hospital oversaw the implementation of hospital-wide emergency measures. In accordance with these measures, the hospital's thoracic surgery ward implemented a new management system by reformulating staff training plans, patient admission procedures, and other systems for managing the ward and protecting perioperative patients. Overall, the ward was successful in restoring normal working order, protecting all staff from occupational exposures, and ensuring the safety of inpatients and their families.
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[Current Status of Prevention and Nursing on Venous Thromboembolism among Perioperative Patients with Lung Cancer]. ZHONGGUO FEI AI ZA ZHI = CHINESE JOURNAL OF LUNG CANCER 2017; 20:661-666. [PMID: 29061212 PMCID: PMC5972997 DOI: 10.3779/j.issn.1009-3419.2017.10.01] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND The purpose of this study was to explore the status of prevention and nursing on venous thromboembolism (VTE) among perioperative patients with lung cancer in Chinese hospital. METHODS A self-designed questionnaire was used to investigate 108 head nurses from tertiary hospitals during the first West China Forum on Chest Enhanced Recovery After Surgery (ERAS). RESULTS (1) Current status of assessment tools and prevention guidelines: 97.22% of the hospitals have carried out VTE risk assessments for surgical patients with lung cancer, 67.59% of the hospitals have established the nursing prevention specifications of VTE. (2) Current status of screening, precaution and follow-up: 56.48% of the hospitals have taken different approach to screen VTE for lung cancer patients in pre-operative period. 90.74% of the hospitals and 52.78% of the hospitals had VTE prophylaxis for hospitalized and discharged patients, but only 17.59% of hospitals were followed up on the incidence of VTE for discharged patients. (3) There was no statistically significant difference in VTE prevention between different type hospitals (P>0.05). But, all patients in the specialist hospital have been fully implemented on VTE risk assessment and VTE prevention (100.00%). CONCLUSIONS The clinical staff have already realized the importance of VTE prevention, and the VTE prevention in perioperative patients with lung cancer has received extensive attention. But there is still lack of effective risk assessment tools and standardized guidelines of VTE prevention.
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Esophagogastric junction outflow obstruction is often associated with coexistent abnormal esophageal body motility and abnormal bolus transit. Dis Esophagus 2017; 30:1-4. [PMID: 28859391 DOI: 10.1093/dote/dox066] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Accepted: 05/22/2017] [Indexed: 12/11/2022]
Abstract
Currently, the diagnosis of esophageal motility disorders is in part based upon a hierarchical algorithm in which abnormalities of the esophagogastric junction (EGJ) is prioritized. An important metric in evaluating the EGJ is the integrated relaxation pressure (IRP). Patients who do not have achalasia but are found to have an elevated IRP are diagnosed with EGJ outflow obstruction. It has been our observation that a subset of these patients also has a second named motility disorder and may also have abnormal bolus transit. The aim of this study is to determine the frequency of abnormal body motility and or abnormal bolus movement in patients with EGJ outflow obstruction. Further, in an effort to evaluate the potential clinical value in measuring bolus transit as a complement to esophageal manometry, specifically in patients with EGJ outflow obstruction, we analyzed the presenting symptoms of these patients. A total of 807 patients with a mean age of 53 years completed esophageal function testing with impedance monitoring and high-resolution manometry between January 2012 and October 2016. There were 74 patients with achalasia who were excluded from the study. Of the remaining 733 patients, 138 (19%) had an elevated IRP and were given a diagnosis of EGJ outflow obstruction. Among these patients, 56 (40%) were diagnosed with an abnormal motility pattern to liquids (ineffective esophageal motility = 28, distal esophageal spasm = 19, Jackhammer = 6), of which 44 (76%) had abnormal bolus transit to liquids, viscous, or both. In contrast, there were 82 patients with EGJ outflow obstruction and normal esophageal motility, of which 33 (40%) had abnormal bolus transit. Patients with preserved esophageal motility and EGJ outflow obstruction were then evaluated. Of the 733 patients, 299 (40%) had intact esophageal motility. Of the 299 patients with normal esophageal motility, 56 patients had an elevated IRP, of which 16 (28%) had abnormal bolus transit. There were 243 (33%) patients with intact esophageal motility and normal IRP. Of these, 56 (23%) patients had abnormal bolus transit. Among patients with abnormal bolus transit, the two most commonly presenting symptoms were dysphagia and heartburn. A substantial percentage of patients with EGJ outflow obstruction have abnormal esophageal body motility and or abnormal bolus transit. The clinical implications of EGJ outflow obstruction need to be further elucidated as current criteria do not allow for the description of other abnormalities in esophageal motility and bolus transit among patients who are given the diagnosis of EGJ outflow obstruction.
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[Tissue culture techniques: the past century, present and prospect]. ZHONGHUA ZHONG LIU ZA ZHI [CHINESE JOURNAL OF ONCOLOGY] 2007; 29:479-480. [PMID: 17974290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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[Determination of trace Pb and Cd in water treatment reagent by graphite furnace atomic absorption spectrometry]. GUANG PU XUE YU GUANG PU FEN XI = GUANG PU 2000; 20:379-380. [PMID: 12958963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The optimum conditions for the determination of trace Pb and Cd in water treatment reagent by graphite furnace atomic absorption spectrometry were studied in detail in this paper. The results show that the long and tedious pretreatment process was cut down by calibrating background with D2 lamp and NH4H2PO4 as matrix modifier. The determination limits were 0.65 microgram.L-1 and 0.12 microgram.L-1 for (Pb and Cd) and linear ranges were 0-50 micrograms.L-1, 0-20 micrograms.L-1 for Pb and Cd, respectively. Rate of recovery was 90%-110%. This method is accurate, quick and simple, and can be used successfully to determine actual samples.
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[Intrahepatic portal vein compliance in cirrhosis]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1998; 36:350-2. [PMID: 11825409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To elaborate the effects of increase in portal flow on intrahepatic vein compliance with isolated perfused cirrhotic model (IPCM). METHOD Cirrhosis was induced by CCl(4) in 80 Wistar rats, which were divided into two groups A and B, by portal with/without hepato-artery. Portal flow was increased and hemodynamic parameters were recorded and analysed. RESULT In group A, compared with 1.65 +/- 0.28 kPa at basal control, portal pressure was elevated from 2.55 +/- 0.40 kPa to 3.96 +/- 0.67 kPa. Q(35)-Q(55) flow rates were raised from 35 to 55 ml/min, respectively. A correlation existed between portal flows and pressures (r = 0.985, P < 0.01). The low flow rate of 15 ml/min at Q(15) caused a irreversible model injury. A largest flow rate in IPCM was, less than in IPRL. In group B, no low flow-injury was found. CONCLUSION Portal vein compliance of liver is decreased markedly in cirrhotic portal hypertension, but hepatic flow is increased. There are likely some compensative relations between portal and hepato-arterial system.
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[Studies of loss of heterozygosity(LOH) in Chinese human gastric cancer tissues]. ZHONGHUA ZHONG LIU ZA ZHI [CHINESE JOURNAL OF ONCOLOGY] 1998; 20:116-8. [PMID: 10920959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
OBJECTIVE To identify the LOH frequency in Chinese gastric cancer samples and locate lost region of gastric cancer-related tumor suppressor gene. METHODS Thirty microsatellite markers were used to examine 42 cases of tumor-normal paired gastric cancer tissues for LOH on all chromosomes (except Y) using polymerase chain reaction(PCR). RESULTS The total frequency of LOH in 42 gastric cancer was 27.7%. High frequencies of LOH (> or = 40%) were observed at loci D3S1067, D3S1577, D6S430, D15S205, D17S945, and D5S407, D2S136, D2S147, D13S175, D14S68, D8S279 loci had LOH frequency > or = 30%. Significantly more LOH cases were observed in the poorly differentiated type and the signet-cell type than in well differentiated type of gastric cancers (P = 0.00699 and 0.0001). The incidence of LOH in signet-cell cancer was even significantly higher than that in poorly differentiated gastric carcinomas(P = 0.0019). LOH was not found in 4 cases with well differentiated gastric cancer. CONCLUSION The most common LOH occurred at D3S1577, D3S1067, D5S407, D6S430, D8S279, D15S205 and D17S945 might imply the existence of potential tumor suppressor genes of gastric cancer.
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An EPROM-based heart-rate meter with wide range and multifunctions. JOURNAL OF BIOMEDICAL ENGINEERING 1992; 14:159-62. [PMID: 1564924 DOI: 10.1016/0141-5425(92)90023-e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A digital heart-rate meter has been developed to display instantaneous as well as average heart-rate of 4 or 8 beats. The display resolution is 1 beat min-1 (BPM) in the range of 13-362 BPM, and 8 BPM in the range of up to 999 BPM. The whole circuit consists of 10 general-purpose integrated circuits (including LCDs). Two EPROM 2716 chips are preprogrammed with heart-rate data. A 12-bit binary counter, which sums the clock pulses between beat-to-beat intervals, is used to address the EPROMs to send appropriate data to the LCD display. We conclude that, with the resolution of 1 BPM, the relationship between the counting clock frequency f and upper display limit f' and lower display limit f" are: f' approximately square root 60f; f" = 60f/Nmax Where Nmax is the capacity of the EPROMs. To extend the dislay range, two clock frequencies, i.e. 256 Hz and 2048 Hz, are generated and switched automatically according to the heart-rate measured. The former is for the heart-rate less than 120 BPM, and the latter is for that higher than 120BPM.
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The activation of protooncogene c-Ha-ras and the control of its expression in human stomach cancer. Chin J Cancer Res 1988. [DOI: 10.1007/bf02997632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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The localization of a transforming oncogene BGC-ha-ras cloned from the gastrocarcinoma cell line BGC-823. Chin J Cancer Res 1988. [DOI: 10.1007/bf02997646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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[Effect of Na2SeO3 on the damages of genetic materials induced by MNNG in children's foreskin fibroblasts in vitro]. ZHONGHUA ZHONG LIU ZA ZHI [CHINESE JOURNAL OF ONCOLOGY] 1988; 10:180-3. [PMID: 3219977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
In order to study the effect of selenium on anticarcinogenesis, micronuclei (MN) and chromosome aberrations (CA) were used as the indexes to reflect the damages on the genetic materials induced by MNNG in children's foreskin fibroblasts in vitro. In the MN test, the final concentrations of Na2SeO3 were 10(-7), 10(-6), 10(-5) and 10(-4) M and MNNG, 10(-5)M. In the CA test, Na2SeO3 were used in 10(-7), 10(-6) and 10(-5)M and MNNG, 10(-6)M as the final concentrations. Relative to the time of MNNG treatment, the cells were exposed to Na2SeO3 4 hours before and at the same time as with the carcinogen. The results showed that the MN% (number of cells out of one thousand MN) was reduced from 4.31 +/- 0.91% to 1.55 +/- 0.54% and 1.54 +/- 0.54% (P less than 0.05), respectively. The CA% (the percentage of the cell with CA) was reduced from 86 +/- 7% to 34 +/- 9% and 33 +/- 9% (P less than 0.05), respectively. However there was no like results when the cells were treated with Na2SeO3 and MNNG simultaneously. Na2SeO3 had no significant protective effects on the cells when the concentration was 10(-7)M. If the dose was 10(-4)M or more, Na2SeO3 became toxic to the cells. The results suggested that the protection of Na2SeO3 on the damages of genetic materials induced by MNNG be time and dose dependent.
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