26
|
Yang Q, Mao Y, Wang J, Yu H, Zhang X, Pei X, Duan Z, Xiao C, Ma M. Gestational bisphenol A exposure impairs hepatic lipid metabolism by altering mTOR/CRTC2/SREBP1 in male rat offspring. Hum Exp Toxicol 2022; 41:9603271221129852. [PMID: 36137816 DOI: 10.1177/09603271221129852] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Lipid metabolism is an important biochemical process in the body. Recent studies have found that environmental endocrine disruptors play an important role in the regulation of lipid metabolism. Bisphenol A (BPA), a common environmental endocrine disruptor, has adverse effects on lipid metabolism, but the mechanism is still unclear. This study aimed to investigate the effects of gestational BPA exposure on hepatic lipid metabolism and its possible mechanism in male offspring. The pregnant Sprague-Dawley rats were exposed to BPA (0, 0.05, 0.5, 5 mg/kg/day) from day 5 to day 19 of gestation to investigate the levels of triglyceride (TG) and total cholesterol (TC), and the expression of liver lipid metabolism-related genes in male offspring rats. The results showed that compared with the control group, the TG and TC levels in serum and liver in BPA-exposed groups was increased. And the expressions of liver fatty acid oxidation related genes, such as peroxisome proliferators-activated receptor α (PPARα) and carnitine palmitoyl transferase 1α (CPT1α), were down-regulated. However, the expressions of fatty acid synthesis related genes, such as sterol regulatory element binding proteins 1 (SREBP-1), acetyl-CoA carboxylase 1 (ACC1), fatty acid synthase (FAS) and stearoyl-CoA desaturase 1 (SCD-1), were up-regulated. The increased protein levels of mTOR and p-CRTC2 suggested that CREB-regulated transcription coactivator 2 (CRTC2) might be an important mediator in the mTOR/SREBP-1 pathway. In conclusion, these results demonstrated that mTOR/CRTC2/SREBP-1 could be affected by gestational BPA exposure, which may involve in the lipid metabolic disorders in later life.
Collapse
|
27
|
Chen H, Yan T, Zhang J, Pei X, Cui Z, Song B. Formation of asymmetric belt-like aggregates from a bio-based surfactant derived from dehydroabietic acid. SOFT MATTER 2021; 17:9950-9956. [PMID: 34694306 DOI: 10.1039/d1sm01375k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The morphology and physicochemical properties of ordered molecular aggregates are closely related to surfactant molecules. Herein, a rosin-based amine oxide surfactant containing a large hydrophobic group (abbreviated R-10-AO) was synthesized from dehydroabietic acid, which is an important derivative of rosin. Cryogenic transmission electron microscopy (cryo-TEM) images and small-angle X-ray scattering (SAXS) showed that at a concentration of ∼5 mM, R-10-AO molecules formed flexible nanobelts with a thickness of only 2-3 nm. The width of these nanobelts was 50-150 nm and the length was more than 1 μm. The formation of the stable nanobelts arose from the strong van der Waals forces of the bulky hydrophobic portions of R-10-AO in solution, facilitating the stability of the asymmetrical aggregates. Rheological tests showed that the formed nanobelts were thermodynamically stable. The entanglement of these nanobelts led to significant viscoelasticity of the solutions. The zero-shear viscosity (η0) of the R-10-AO solution reached 10 Pa s at a concentration of 5 mM, which is much greater than that of most wormlike micellar solutions. This work provides the inspirations of preparing aggregates with novel properties using natural products.
Collapse
|
28
|
Liu P, Pei X, Li C, Li R, Chen Z, Song B, Cui Z, Xie D. pH-switchable wormlike micelles with high viscoelasticity formed by pseudo-oligomeric surfactants. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116499] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
29
|
Pei X, Zhang S, Zhang W, Liu P, Song B, Jiang J, Cui Z, Binks BP. Behavior of Smart Surfactants in Stabilizing pH‐Responsive Emulsions. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202013443] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
|
30
|
Pei X, Zhang S, Zhang W, Liu P, Song B, Jiang J, Cui Z, Binks BP. Behavior of Smart Surfactants in Stabilizing pH-Responsive Emulsions. Angew Chem Int Ed Engl 2021; 60:5235-5239. [PMID: 33258181 DOI: 10.1002/anie.202013443] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 11/18/2020] [Indexed: 11/10/2022]
Abstract
Newly structured pH-responsive smart surfactants (N+ -(n)-N, n=14, 16) from alkyl trimethylammonium bromides are reported. In neutral and alkaline media N+ -(n)-N behaves as a normal cationic surfactant and stabilizes conventional emulsions alone, as well as Pickering emulsions and oil-in-dispersion emulsions together with oppositely and similarly charged nanoparticles, respectively. In acidic media N+ -(n)-N becomes a hydrophilic Bola-type surfactant, N+ -(n)-NH+ , and is an inferior emulsifier either when used alone or together with charged nanoparticles, resulting in demulsification. N+ -(n)-NH+ returns to the aqueous phase alone or together with nanoparticles after demulsification without contaminating the oil phase, and the aqueous phase can be recycled when triggered by pH change. This protocol is a green process and leads to preparation of various temporarily stable emulsions which are often used in emulsion polymerization, heterogeneous catalysis, and oil transportation.
Collapse
|
31
|
Xu M, Zhang W, Jiang J, Pei X, Zhu H, Cui Z, Binks BP. Transition between a Pickering Emulsion and an Oil-in-Dispersion Emulsion Costabilized by Alumina Nanoparticles and a Cationic Surfactant. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:15543-15551. [PMID: 33332125 DOI: 10.1021/acs.langmuir.0c02892] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The transition between a novel oil-in-dispersion emulsion and an oil-in-water (O/W) Pickering emulsion triggered by pH was achieved using alumina nanoparticles in combination with a cationic surfactant. In acidic and neutral aqueous media, positively charged particles and the surfactant both at very low concentrations costabilize an oil-in-dispersion emulsion with the surfactant adsorbed at droplet interfaces and particles dispersed in the aqueous phase between the droplets. In alkaline media, however, particles become negatively charged and are hydrophobized in situ by adsorption of the surfactant to become surface-active and stabilize an O/W Pickering emulsion. The transition between the two is also possible by lowering the pH. The transformation can be achieved several times in a mixture of 0.1 wt % nanoparticles and 0.01 mM surfactant. This transition is significant, since particles can be made to either adsorb at the oil-water interface, which is beneficial for applications like biphasic catalysis, or remain dispersed in the aqueous phase, which is favorable for their recovery and reuse.
Collapse
|
32
|
Li R, Zhang Z, Pei X, Xia X. Covalent Immobilization of L-Asparaginase and Optimization of Its Enzyme Reactor for Reducing Acrylamide Formation in a Heated Food Model System. Front Bioeng Biotechnol 2020; 8:584758. [PMID: 33178677 PMCID: PMC7593842 DOI: 10.3389/fbioe.2020.584758] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Accepted: 09/10/2020] [Indexed: 12/14/2022] Open
Abstract
Acrylamide is a potent carcinogen and neurotoxin that is mainly formed by the Maillard reaction of asparagine with starch at high temperatures. In this work, a food safety immobilization system for L-asparaginase (L-ASNase) consisting of food-grade agarose (Aga) spheres and N-hydroxysuccinimide esters was developed to decrease the formation of acrylamide in a fluid food model system. L-asparaginase was successfully immobilized with a maximum immobilization efficiency of 68.43%. The immobilized enzymes exhibited superior storage stability and reusability with 93.21 and 72.25% of the initial activity retained after six consecutive cycles and storage for 28 days, indicating its high industrial application potential. Meanwhile, a simplified mathematical model of the enzyme reactor was developed and verified with experiments, which demonstrated its auxiliary role in the design and optimization of reactors. In addition, simulated fluidized food components were continuously catalyzed in the designed packed bed reactor, achieving a reduction rate of nearly 89%.
Collapse
|
33
|
Chen Z, Xie D, Song B, Li C, Pei X, Li R. Worm-like micelles constructed by “pseudo” tetrameric surfactants containing azobenzene groups. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113847] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
34
|
Wang D, Chen H, Song B, Yan T, Zhai Z, Pei X, Cui Z. Supramolecular Hydrogels with Chiral Nanofibril Structures Formed from β-Cyclodextrin and a Rosin-Based Amino Acid Surfactant. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:10056-10062. [PMID: 32816467 DOI: 10.1021/acs.jafc.0c03748] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The rational combination of natural molecules is expected to provide new soft material building blocks. Herein, a rosin-based amino acid surfactant was synthesized using dehydroabietic acid and l-serine as the starting materials (denoted as R-6-Ser). Supramolecular hydrogels were formed when β-cyclodextrin (β-CD) was mixed with R-6-Ser at molar ratios of over 0.5:1 and above certain concentrations. The hydrogels were investigated using rheometry, small-angle X-ray scattering, CD spectroscopy, and cryo-transmission electron microscopy (cryo-TEM). The β-CD associated with the isopropyl benzyl group of the dehydroabietic acid unit in R-6-Ser and formed R-6-Ser@β-CD complexes. The complexes and R-6-Ser self-assembled to form elongated right-handed rigid fibers with a diameter of approximately 7-8 nm, which were responsible for the elasticity of the hydrogels. This work demonstrated the feasibility of preparing supramolecular hydrogels from a diterpenoid-based surfactant and β-CD and provides a new means of utilizing the secretions of pine trees.
Collapse
|
35
|
Roberts WL, Gross GA, Gimpel JR, Smith LL, Arnhart K, Pei X, Young A. An Investigation of the Relationship Between COMLEX-USA Licensure Examination Performance and State Licensing Board Disciplinary Actions. ACADEMIC MEDICINE : JOURNAL OF THE ASSOCIATION OF AMERICAN MEDICAL COLLEGES 2020; 95:925-930. [PMID: 31626002 DOI: 10.1097/acm.0000000000003046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
PURPOSE Passing the Comprehensive Osteopathic Medical Licensing Examination of the United States (COMLEX-USA) serves as a licensing requirement, yet there is limited understanding between this high-stakes exam and performance outcomes. This study examined the relationship between COMLEX-USA scores and disciplinary actions received by osteopathic physicians. METHOD Data for osteopathic physicians (N = 26,383) who graduated from medical school between 2004 and 2013 were analyzed using multinomial logistic regression to assess the relationship between COMLEX-USA scores and placement into one of 3 disciplinary action categories relative to no action received, controlling for years in practice and gender. RESULTS Less than 1% of physicians in this study (n = 187) had a disciplinary action(s). Controlling for all COMLEX-USA levels, years in practice, and gender, higher Level 3 scores were associated with significant decreased odds for all action categories: revoked licensed (odds ratio [OR] = 0.51, 95% confidence interval [CI] 0.36, 0.72; P < .001), imposed limitations to practice (OR = 0.59, 95% CI 0.41, 0.84; P < .01), and other action imposed (OR = 0.48, 95% CI 0.33, 0.69; P < .001), relative to not receiving an action. In these same models, higher Level 2 Performance Evaluation Biomedical/Biomechanical Domain scores decreased the odds for an action that revoked a license (OR = 0.75, 95% CI 0.58, 0.98; P < .05) and imposed limitations to practice (OR = 0.64, 95% CI 0.49, 0.84; P < .001). CONCLUSIONS These findings provide evidence that the COMLEX-USA delivers useful information regarding the likelihood of a practitioner receiving state board disciplinary actions.
Collapse
|
36
|
Kopp JP, Ibáñez B, Jones AT, Pei X, Young A, Arnhart K, Rizzo AG, Buyske J. Association Between American Board of Surgery Initial Certification and Risk of Receiving Severe Disciplinary Actions Against Medical Licenses. JAMA Surg 2020; 155:e200093. [PMID: 32186688 DOI: 10.1001/jamasurg.2020.0093] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Importance Board certification is used as a marker of surgeon quality and professionalism. Although some research has linked certification in surgery to outcomes, more research is needed. Objective To measure associations between surgeons obtaining American Board of Surgery (ABS) certification and examination performance with receiving future severe disciplinary actions against their medical licenses. Design, Setting, and Participants Retrospective analysis of severe license action rates for surgeons who attempted ABS certification based on certification status and examination performance. Surgeons who attempted to become certified were classified as certified or failing to obtain certification. Additionally, groups were further categorized based on whether the surgeon had to repeat examinations and whether they ultimately passed. The study included surgeons who initially attempted certification between 1976 and 2017 (n = 44 290). Severe license actions from 1976 to 2018 were obtained from the Federation of State Medical Boards, and certification data were obtained from the ABS database. Data were analyzed between 1978 and 2008. Main Outcomes and Measures Severe license action rates were analyzed across certified surgeons and those failing to obtain certification, as well as across examination performance groups. Results The final dataset included 36 197 men (81.7%) and 8093 women (18.3%). The incidence of severe license actions was significantly greater for surgeons who attempted and failed to obtain certification (incidence rate per 1000 person-years = 2.49; 95% CI, 2.13-2.85) than surgeons who were certified (incidence rate per 1000 person years = 0.77; 95% CI, 0.71-0.83). Adjusting for sex and international medical graduate status, the risk of receiving a severe license action across time was also significantly greater for surgeons who failed to obtain certification. Surgeons who progressed further in the certification examination sequence and had fewer repeated examinations had a lower incidence and less risk over time of receiving severe license actions. Conclusions and Relevance Obtaining board certification was associated with a lower rate of receiving severe license actions from a state medical board. Passing examinations in the certification examination process on the first attempt was also associated with lower severe license action rates. This study provides supporting evidence that board certification is 1 marker of surgeon quality and professionalism.
Collapse
|
37
|
Riaz N, Sherman E, Pei X, Schoder H, Paudyal R, Katabi N, Ma D, Tsai C, McBride S, Morris L, Boyle J, Singh B, Foote R, Ho A, Wong R, Humm J, Dave A, Pfister D, Reis-Filho J, Lee N. Genetic and micro-environmental factors influencing response to definitive 30Gy chemo-radiotherapy (chemoRT) in HPV Positive Oropharyngeal Cancer (OPC). Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2019.11.197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
38
|
Yan T, Song B, Cui Z, Pei X. Highly wet aqueous foams stabilized by an amphiphilic bio-based hydrogelator derived from dehydroabietic acid. SOFT MATTER 2020; 16:2285-2290. [PMID: 32040130 DOI: 10.1039/d0sm00002g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Exploration of novel molecular aggregates that stabilize foam systems is helpful to optimize foam properties. Herein, solutions of a rosin-based low-molecular-weight hydrogelator, abbreviated as R-6-AO, were used to generate foams above the critical gelation temperature (Tgel). The foams with R-6-AO concentrations above the critical gelation concentration were very stable below Tgel. The high stability of the foams under such conditions was attributed to the self-assembly of nanoscale fibers of R-6-AO in the liquid films of the foams, leading to extremely slow drainage of water. The foams showed strong water retention and were classified as very wet foams. For example, the foams generated from 10 mM (0.44 wt%) R-6-AO solution subjected to a fast cooling process contained about 45 vol% trapped water after 2000 min. In comparison, the water volume fraction of a 10 mM sodium dodecyl sulfate (SDS) foam decreased from 20 vol% to 1 vol% within 18 min. Because the growth, elongation, and cross-linking of the assembled nanofibers in the liquid films were affected by the cooling process, the stability of these foams also depended on the initial preparation temperature. The present system reveals the importance of microstructures in regulating foam behavior and serves as a new type of condition-sensitive intelligent foam.
Collapse
|
39
|
Yang M, Song B, Du D, Pei X, Cui Z. Solution and emulsion behavior of highly soluble carboxylate surfactants with α-substituted phenoxy group. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
40
|
Yan T, Song B, Pei X, Cui Z, Binks BP, Yang H. Widely Adaptable Oil-in-Water Gel Emulsions Stabilized by an Amphiphilic Hydrogelator Derived from Dehydroabietic Acid. Angew Chem Int Ed Engl 2020; 59:637-641. [PMID: 31670436 DOI: 10.1002/anie.201907774] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 10/18/2019] [Indexed: 12/25/2022]
Abstract
A surfactant, R-6-AO, derived from dehydroabietic acid has been synthesized. It behaves as a highly efficient low-molecular-weight hydrogelator with an extremely low critical gelation concentration (CGC) of 0.18 wt % (4 mm). R-6-AO not only stabilizes oil-in-water (O/W) emulsions at concentrations above its critical micelle concentration (cmc) of 0.6 mm, but also forms gel emulsions at concentrations beyond the CGC with the oil volume fraction freely adjustable between 2 % and 95 %. Cryo-TEM images reveal that R-6-AO molecules self-assemble into left-handed helical fibers with cross-sectional diameters of about 10 nm in pure water, which can be turned to very stable hydrogels at concentrations above the CGC. The gel emulsions stabilized by R-6-AO can be prepared with different oils (n-dodecane, n-decane, n-octane, soybean oil, olive oil, tricaprylin) owing to the tricyclic diterpene hydrophobic structure in their molecules that enables them to adopt a unique arrangement in the fibers.
Collapse
|
41
|
Li R, Zhang Q, Pei X, Xie D, Song B. The rheological behavior of organic salt/Gemini surfactant mixed systems: Effect of isomerization of additives. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124114] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
42
|
Yan T, Song B, Pei X, Cui Z, Binks BP, Yang H. Widely Adaptable Oil‐in‐Water Gel Emulsions Stabilized by an Amphiphilic Hydrogelator Derived from Dehydroabietic Acid. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201907774] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
43
|
Pei X, Liu L, Cai Y, Peng Y, Ma C, Jin Y, Ping Z. Body mass index cut-off points for predicting chronic non-communicable disease should differ by gender and age group. Public Health 2019; 175:54-59. [PMID: 31398517 DOI: 10.1016/j.puhe.2019.06.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 04/15/2019] [Accepted: 06/26/2019] [Indexed: 11/30/2022]
Abstract
OBJECTIVES The objective of this study to determine whether body mass index (BMI) in different genders and age groups need different thresholds when predicting chronic non-communicable diseases (CNCDs). STUDY DESIGN This is a cross-sectional study. METHODS Data were obtained from the China Health and Nutrition Survey conducted in 2009. Sequential sample cluster analysis was used to group age according to BMI. Propensity score matching was used to eliminate the influence of age. Receiver operating characteristic curve based on gender and age group was used to evaluate the cut-off values and efficiency of BMI in each group. RESULTS A total of 8469 individuals were enrolled in this study. Results of sequential sample cluster analyses showed age was divided into three groups: 18-39, 40-59 and 60-99 years. There were significant differences in the distribution of BMI among the three groups for both males and females (P < 0.001). Statistical differences were observed in the distribution of BMI between genders in the 18-39- and 60-99-year-old age groups (P < 0.001). For men, the cut-off values of BMI were ≥25 kg/m2, ≥24 kg/m2 and ≥23 kg/m2 in the 18-39, 40-59 and 60-99 years old groups, respectively; for women, the corresponding cut-off points were ≥25 kg/m2, ≥23 kg/m2 and ≥25 kg/m2 in groups. CONCLUSIONS The thresholds for BMI might be different between gender and age group. In addition, it might not be suitable to determine cut-off values of BMI to predict CNCDs for people aged ≥60 years.
Collapse
|
44
|
Young A, Chaudhry HJ, Pei X, Arnhart K, Dugan M, Steingard SA. FSMB Census of Licensed Physicians in the United States, 2018. ACTA ACUST UNITED AC 2019. [DOI: 10.30770/2572-1852-105.2.7] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACT
There are 985,026 physicians with Doctor of Medicine (MD) and Doctor of Osteopathic Medicine (DO) degrees licensed to practice medicine in the United States and the District of Columbia, according to physician census data compiled by the Federation of State Medical Boards (FSMB). These qualified physicians graduated from 2,089 medical schools in 167 countries and are available to serve a U.S. national population of 327,167,434. While the percentage of physicians who are international medical graduates have remained relatively stable over the last eight years, the percentage of physicians who are women, possess a DO degree, have three or more licenses, or are graduates of a medical school in the Caribbean have increased by varying degrees during that same period.
This report marks the fifth biennial physician census that the FSMB has published, highlighting key characteristics of the nation's available physician workforce, including numbers of licensees by geographic region and state, type of medical degree, location of medical school, age, gender, specialty certification and number of active licenses per physician. The number of licensed physicians in the United States has been growing steadily, due in part to an expansion in the number of medical schools and students during the past two decades, even as concerns of a physician shortage to meet health care demands persist. The average age of licensed physicians continues to increase, and more licensed physicians appear to be specialty certified, though the latter finding may reflect more comprehensive reporting. This census was compiled using the FSMB's Physician Data Center (PDC), which collects, collates and analyzes physician data directly from the nation's state medical and osteopathic boards and is uniquely positioned to provide a comprehensive snapshot of information about licensed physicians. A periodic national census of this type offers useful demographic and licensure information about the available physician workforce that may be useful to policy makers, researchers and related health care organizations to better understand and address the nation's health care needs.
Collapse
|
45
|
Wang G, Liu L, Tao W, Xiao Z, Pei X, Liu B, Wang M, Lin G, Ao T. Effects of replacing inorganic trace minerals with organic trace minerals on the production performance, blood profiles, and antioxidant status of broiler breeders. Poult Sci 2019; 98:2888-2895. [DOI: 10.3382/ps/pez035] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 01/23/2019] [Indexed: 01/22/2023] Open
|
46
|
Lin Q, Xu M, Cui Z, Pei X, Jiang J, Song B. Structure and stabilization mechanism of diesel oil-in-water emulsions stabilized solely by either positively or negatively charged nanoparticles. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.04.046] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
47
|
Ashley C, Paula A, Kumar R, Mandelker D, Pei X, Riaz N, Reis-Filho J, Weigelt B. Mutational signature analysis of primary and metastatic endometrial cancer reveals associations with molecular subtypes and shifts during tumor progression. Gynecol Oncol 2019. [DOI: 10.1016/j.ygyno.2019.04.113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
48
|
Peabody MR, Young A, Peterson LE, O'Neill TR, Pei X, Arnhart K, Chaudhry HJ, Puffer JC. The Relationship Between Board Certification and Disciplinary Actions Against Board-Eligible Family Physicians. ACADEMIC MEDICINE : JOURNAL OF THE ASSOCIATION OF AMERICAN MEDICAL COLLEGES 2019; 94:847-852. [PMID: 30768464 DOI: 10.1097/acm.0000000000002650] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
PURPOSE Lack of specialty board certification has been reported as a significant physician-level predictor of receiving a disciplinary action from a state medical board. This study investigated the association between family physicians receiving a disciplinary action from a state medical board and certification by the American Board of Family Medicine (ABFM). METHOD Three datasets were merged and a series of logistic regressions were conducted examining the relationship between certification status and disciplinary actions when adjusting for covariates. Data were available from 1976 to 2017. Predictor variables were gender, age, medical training degree type, medical school location, and the severity of the action. RESULTS Of the family physicians in this sample, 95% (114,454/120,443) had never received any disciplinary action. Having ever been certified was associated with a reduced likelihood of ever receiving an action (odds ratio [OR] = 0.35; 95% confidence interval [CI] = 0.30, 0.40; P < .001), and having held a prior but not current certification at the time of the action was associated with an increase in receiving the most severe type of action (OR = 3.71; 95% CI = 2.24, 6.13; P < .001). CONCLUSIONS Disciplinary actions are uncommon events. Family physicians who had ever been ABFM certified were less likely to receive an action. The most severe actions were associated with decreased odds of being board certified at the time of the action. Receiving the most severe action type increased the likelihood of physicians holding a prior but not current certification.
Collapse
|
49
|
Smith E, Paula A, Cadoo K, Abu-Rustum N, Pei X, Riaz N, Robson M, Reis-Filho J, Mandelker D, Weigelt B. Endometrial cancers in or germline mutations carriers. Gynecol Oncol 2019. [DOI: 10.1016/j.ygyno.2019.04.154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
50
|
Wang D, Feng L, Song B, Pei X, Cui Z, Xie D. Viscoelastic lyotropic liquid crystals formed in a bio-based trimeric surfactant system. SOFT MATTER 2019; 15:4208-4214. [PMID: 31073550 DOI: 10.1039/c8sm02594k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Exploring the self-assembly of oligomeric surfactants is expected to bridge the gap between conventional and polymeric surfactants. Using the natural resource rosin as the starting material, a bio-based star-shaped trimeric quaternary ammonium surfactant (abbreviated tri-R-4-Phe) was synthesized. With three bulky dehydroabietic acid units in the hydrophobic group, tri-R-4-Phe has a molecular weight of 1684.9 and shows strong affinity towards both water and nonpolar organic compounds. In the presence of tri-R-4-Phe, C12EO3 was able to form lamellar lyotropic liquid crystals over a wide concentration range in water. The tri-R-4-Phe/C12EO3/water tertiary system was investigated by polarizing optical microscopy (POM), small angle X-ray scattering (SAXS) and rheological measurements. The investigated samples with different formulations all showed strong viscoelasticity, and the viscosity increased with the surfactant content. All samples showed interesting shear banding phenomena due to the shear induced mesoscale phase transition in tri-R-4-Phe/C12EO3/water systems. The present work reveals the unique behaviour of trimeric surfactant involved LLC systems and the result may be helpful in investigating delicate molecular self-assembly using natural resources.
Collapse
|