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Search Results: 1 - 10 of 87092 matches for " Grace Q. Chen "
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Identification of a Highly Expressed 3-Hydroxy-3-Methylglutaryl-CoA Reductase Gene in the Root Tissue of Taraxacum kok-saghyz  [PDF]
Grisel Ponciano, Grace Q. Chen
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.524376
Abstract:
Kazakh dandelion (Taraxacum kok-saghyz, Tk) is a rubber-producing plant currently being investigated as a source of natural rubber for industrial applications. Like many other isoprenoids, rubber is a downstream product of the mevalonate pathway. The 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR) enzyme catalyzes the conversion of 3-hydroxy-3-methylglutaryl-CoA to mevalonic acid, a key regulatory step in the MVA pathway. Such regulated steps provide targets for increases in isoprenoid and rubber contents via genetic engineering to increase enzyme activities. In this study, we identify a TkHMGR1 gene that is highly expressed in the roots of Kazakh dandelion, the main tissue where rubber is synthesized and stored. This finding paves the way for further molecular and genetic studies of the TkHMGR1 gene, and its role in rubber biosynthesis in Tk and other rubber-producing plants.
Technical Efficiency and Port Competition: Revisiting the Bohai Economic Rim, China
Grace Wang,Chen Gao
Journal of Risk and Financial Management , 2012, DOI: 10.3390/jrfm5010115
Abstract: The Bohai Economic Rim plays an important role in supporting China’s economic growth. For this research, we selected nine main ports in the region to study whether intra-port competition or corporatization would improve efficiency. Using a panel fixed effect model and stochastic frontier model, we found that the technical efficiency of selected ports is significantly influenced by the time of the initial public offering than by regional competition. The results are supportive and encouraging for policy makers to move toward the decentralized port governance in China.
Predictive models of ethanol concentrations in simulated exhaled breath and exhaled breath condensate under varied sampling conditions  [PDF]
Shih-Fang Chen, Mary-Grace C. Danao
Journal of Biomedical Science and Engineering (JBiSE) , 2013, DOI: 10.4236/jbise.2013.68096
Abstract: Breath monitoring is a non-invasive, safe, and repeatable approach to determining the respiratory, gastrointestinal, and general health status of humans and other mammals. Breath samples could be detected in two ways—directly sensing exhaled breath (EB) or chilling the EB to obtaining the exhaled breath condensate (EBC). Each has its advantages and disadvantages but they are both affected by different sampling conditions. The dearth of information on how sampling conditions affect the intrinsic properties of biomarkers in breath hinders the use of breath monitoring in clinical use. In this study, ethanol, a potential biomarker of liver function, was chosen as a model biomarker to demonstrate the effect of sampling conditions on different phases and how breath sampling could be standardized by developing predictive models. EB and EBC samples were determined under three simulated breath temperatures, two breath rates, and two condensing temperatures for developing predictive models. Results showed EB samples were affected by breath temperatures and EBC samples were affected by condensing temperatures. Flow rate changes did not have a significant influence on both EB and EBC samples. Final predictive models based on 5 minute sensing time were developed for EB (R2 = 0.8261) and EBC (R2 = 0.9471).

FACTORES SOCIALES QUE CONDICIONAN LA ASISTENCIA DE MUJERES A LA CONSULTA NUTRICIONAL
Troncoso P,Claudia; Astudillo O,Andrea; Troncoso Q,Grace;
Revista chilena de nutrición , 2011, DOI: 10.4067/S0717-75182011000100001
Abstract: nutritional consultation is one of the main professional activities of a nutritionist. the research was developed based on this activity, also considering the motivations presented by a group of women who were not referred to a consultation by a treating physician. the primary objective of the study is to interpret the social factors that condition the attendance of cesfam lagunillas users in coronel, (bio-bio region), to a nutritional consultation during the first semester of 2009. in order to achieve the primary objective, a qualitative phenomenological-type study was used as an investigative design. information was collected through structured interviews with 17 women who met the selection criteria, that is to say, the total sample size determined through theoretical saturation. the greatest motivation presented by women who were interviewed about the attendance to a nutritionist consultation was their body image. some social influences were also identified in this decision specially related to their families. regarding this influences, they mentioned their partners and sometimes their mothers. friends, means of communication, and the public opinion were also identified as an influence in their decision of attending to a nutritionist consultation. in conclusion, family is the greatest formal institution that conditions and directly influences the decision made by its members in attending a nutritional consultation.
FACTORES SOCIALES QUE CONDICIONAN LA ASISTENCIA DE MUJERES A LA CONSULTA NUTRICIONAL SOCIAL FACTORS THAT CONDITION WOMEN'S ATTENDANCE TO NUTRITIONAL CONSULTATION
Claudia Troncoso P,Andrea Astudillo O,Grace Troncoso Q
Revista Chilena de Nutricíon , 2011,
Abstract: La consulta nutricional es una de las actividades propias del quehacer profesional del nutricionista. Las motivaciones que presentan un grupo de mujeres que no fueron derivadas por médico tratante originó esta investigación, que tenía como objetivo el interpretar los factores sociales que condicionan la asistencia de usuarias del CESFAM Lagunillas de la comuna de Coronel, región del Bío-Bío a la consulta realizada por nutricionista durante el primer semestre del a o 2009. Para lograr esta meta, se utilizó como dise o investigativo un estudio cualitativo de tipo fenomenológico. La obtención de la información se realizó a través de una entrevista estructurada a 17 mujeres que cumplían con los criterios de selección del estudio, correspondiendo al total de la muestra obtenida a través del punto de saturación. La imagen corporal es la mayor motivación que presentan las mujeres entrevistadas para asistir a la consulta nutricional. Se presentan influencias sociales en esta decisión, en especial las referidas a sus familias, en el que se identifican a sus parejas y en algunas instancias a las madres. Los amigos, los medios de comunicación o la opinión externa social también son identificados como influyentes en su decisión de asistir con el nutricionista a su consulta. Se concluye que la familia es la mayor institución formal que condiciona e influye directamente en las decisiones de sus miembros en diversas actividades, como es, la asistencia a la consulta nutricional. Nutritional consultation is one of the main professional activities of a nutritionist. The research was developed based on this activity, also considering the motivations presented by a group of women who were not referred to a consultation by a treating physician. The primary objective of the study is to interpret the social factors that condition the attendance of CESFAM Lagunillas users in Coronel, (Bio-Bio Region), to a nutritional consultation during the first semester of 2009. In order to achieve the primary objective, a qualitative phenomenological-type study was used as an investigative design. Information was collected through structured interviews with 17 women who met the selection criteria, that is to say, the total sample size determined through theoretical saturation. The greatest motivation presented by women who were interviewed about the attendance to a nutritionist consultation was their body image. Some social influences were also identified in this decision specially related to their families. Regarding this influences, they mentioned their partners and sometimes their mothe
Update on tolterodine extended-release for treatment of overactive bladder
Tola Omotosho, Chi Chiung Grace Chen
Research and Reports in Urology , 2010, DOI: http://dx.doi.org/10.2147/RRU.S7232
Abstract: ate on tolterodine extended-release for treatment of overactive bladder Review (3418) Total Article Views Authors: Tola Omotosho, Chi Chiung Grace Chen Published Date November 2010 Volume 2010:2 Pages 185 - 191 DOI: http://dx.doi.org/10.2147/RRU.S7232 Tola Omotosho, Chi Chiung Grace Chen Women’s Center for Pelvic Health, Department of Gynecology and Obstetrics, Johns Hopkins School of Medicine, Baltimore, MD, USA Abstract: Overactive bladder is a prevalent condition which negatively impacts quality of life and puts a significant economical burden on society. First-line therapy often includes pharmacotherapy with antimuscarinic medications, and numerous research studies have demonstrated that tolterodine extended-release (ER) is an efficacious and tolerable formulation of this class of medication. This review provides an update on the clinical use of tolterodine ER, detailing the current literature on its efficacy, tolerability, adverse effects, and comparability with other commonly prescribed medications for the treatment of overactive bladder.
Update on tolterodine extended-release for treatment of overactive bladder
Tola Omotosho,Chi Chiung Grace Chen
Open Access Journal of Urology , 2010,
Abstract: Tola Omotosho, Chi Chiung Grace ChenWomen’s Center for Pelvic Health, Department of Gynecology and Obstetrics, Johns Hopkins School of Medicine, Baltimore, MD, USAAbstract: Overactive bladder is a prevalent condition which negatively impacts quality of life and puts a significant economical burden on society. First-line therapy often includes pharmacotherapy with antimuscarinic medications, and numerous research studies have demonstrated that tolterodine extended-release (ER) is an efficacious and tolerable formulation of this class of medication. This review provides an update on the clinical use of tolterodine ER, detailing the current literature on its efficacy, tolerability, adverse effects, and comparability with other commonly prescribed medications for the treatment of overactive bladder.Keywords: antimuscarinics, efficacy, quality of life, overactive bladder, tolterodine, urgency, urge urinary incontinence
ACTA MATHEMATICA UNIVERSITATIS COMENIANAE
G.-Q. CHEN
ACTA MATHEMATICA UNIVERSITATIS COMENIANAE , 2001,
Abstract: . Some developments and efforts in designing and analyzing shock capturing algorithms and related numerical methods in computational fluid dynamics are reviewed. The importance of numerical viscosity in shock capturing algorithms is analyzed; the convergence and stability of some shock capturing algorithms are presented; the role of shock capturing algorithms in a mathematical existence theory is exhibited, especially for the compressible Euler equations for gas dynamics in one dimension and in multi-dimensions with spherical symmetry. Applications of shock capturing ideas to the compressible Navier-Stokes equations are also discussed.
Performance Characteristics of SALiM Isolator
H. Teng,Q. Chen
Lecture Notes in Engineering and Computer Science , 2009,
Abstract:
Theoretical Analysis and Numerical Simulation of Resonances and Stability of a Piecewise Linear-Nonlinear Vibration Isolation System
X. Gao,Q. Chen
Shock and Vibration , 2014, DOI: 10.1155/2014/803275
Abstract: A methodology is presented to study the resonance and stability for a single-degree-of-freedom (SDOF) system with a piecewise linear-nonlinear stiffness term (i.e., one piece is linear and the other is weakly nonlinear). Firstly, the exact response of the linear governing equation is obtained, and a modified perturbation method is applied to finding the approximate solution of the weakly nonlinear equation. Then, the primary and 1/2 subharmonic resonances are obtained by imposing continuity conditions and periodicity conditions. Furthermore, Jacobian matrix is derived to investigate the stability of resonance responses. Finally, the results of theoretical study are compared with numerical results, and a good agreement is observed. 1. Introduction Vibration isolation and shock absorbing have always been a hot research topic in engineering practice. A solid and liquid mixture (SALiM) vibration isolator was developed to isolate vibrations and shocks induced by heavy machines [1–3]. The stiffness of the SALiM isolator is piecewise linear-nonlinear in a quasi-static test [3]. That is, the isolator exhibits linear stiffness in some displacement region, beyond which the nonlinear stiffness is observed. Therefore, the elastic restoring force is continuous, but its first-order derivative at the turning point is discontinuous. In the past two decades, the majority of researches focused on the dynamics response, stability, bifurcation, and chaos of piecewise linear systems, such as piecewise bilinear systems or piecewise trilinear systems [4–8]. However, piecewise linear-nonlinear or even nonlinear-nonlinear systems have not received much attention, but many physical systems in fields of aerospace engineering, electric circuit, and so forth appear to be piecewise linear-nonlinear systems [9–12]. For nonsmooth stiffness systems, most approaches finding their steady state responses could be sorted into three groups including harmonic balance method (HBM) and its modified form, increment harmonic balance method (IHBM) [9, 10], classical approximate analytical methods like average method [4, 13–15], and the matching method [6, 7, 11, 16]. For instance, using HBM, Jin et al. investigated the response and stability of an unsymmetrical multiple-degree-of-freedom system with piecewise linear elastic elements [9], and for a more complex oscillator possessing a periodically time-varying and piecewise binonlinear restoring force function HBM is still applicable to its periodic motion [9, 17]. But like all harmonic balance techniques, the accuracy of the results obtained by
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