Sarah M. Chang, violin

Program for Sarah M. Changhttps://digitalcommons.kennesaw.edu/musicprograms/2633/thumbnail.jp

R-matrix Approach to Quantum Superalgebras su_{q}(m|n)

Quantum superalgebras $su_{q}(m\mid n)$ are studied in the framework of $R$-matrix formalism. Explicit parametrization of $L^{(+)}$ and $L^{(-)}$ matrices in terms of $su_{q}(m\mid n)$ generators are presented. We also show that quantum deformation of nonsimple superalgebra $su(n\mid n)$ requires its extension to $u(n\mid n)$.Comment: 14 page

Institutions, the State, and Economic Development: An Analysis and Evaluation of Ha-Joon Chang\u27s Critique of the Dominant Discourse and His Thoughts on State-Led Development Theory

This paper examines two distinct schools of thought on how to best spur economic activity in developing economies. Mainstream economists, like Hernando De Soto and Douglass North, argue private property rights and free markets, and the institutions which nourish and protect them, are the primary driver of economic growth. Heterodox economists, led by prominent author and economist Ha-Joon Chang, acknowledge institutions play an important role in inducing economic activity but challenge the notion institutions are the primary driver of development. They argue targeted state-led investment and regulation are as important, if not more important, than protecting market freedom and private property rights in spurring economic growth in developing economies. Specifically, this paper provides a dispassionate global presentation/analysis of the mainstream/dominant discourse, Chang\u27s critique of the mainstream discourse, as well as a thorough presentation of Chang\u27s thoughts on state-led development theory. By analyzing the works of a broad cross-section of prominent mainstream and heterodox development economists in the context of Chang’s challenge to mainstream thought, this paper sought to come to a better understanding of the significance of Chang\u27s contribution to the literature on institutions and development. This paper concludes that while Chang succeeds at exposing flaws in the mainstream’s arguments, and while he presents a plausible case for state intervention, he is not one-pointedly hostile to the mainstream’s view that property rights and institutions are primary drivers of growth. Indeed, the literature survey summarized above suggests Chang recognizes the importance of property rights but seeks to prod the mainstream into broadening the discussion to include the role of the state, thereby challenging the mainstream’s emphasis on the importance of institutions, specifically private property right

Selective cytotoxicity of goniothalamin against hepatoblastoma HepG2 cells.

Liver cancer has become one of the major types of cancer with high mortality and liver cancer is not responsive to the current cytotoxic agents used in chemotherapy. The purpose of this study was to examine the in vitro cytotoxicity of goniothalamin on human hepatoblastoma HepG2 cells and normal liver Chang cells. The cytotoxicity of goniothalamin against HepG2 and liver Chang cell was tested using MTT cell viability assay, LDH leakage assay, cell cycle flow cytometry PI analysis, BrdU proliferation ELISA assay and trypan blue dye exclusion assay. Goniothalamin selectively inhibited HepG2 cells [IC 50 = 4.6 (±0.23) μM in the MTT assay; IC 50 = 5.20 (±0.01) μM for LDH assay at 72 hours], with less sensitivity in Chang cells [IC 50 = 35.0 (±0.09) μM for MTT assay; IC 50 = 32.5 (±0.04) μM for LDH assay at 72 hours]. In the trypan blue dye exclusion assay, the Viability Indexes were 52 ± 1.73% for HepG2 cells and 62 ± 4.36% for Chang cells at IC 50 after 72 hours. Cytotoxicity of goniothalamin was related to inhibition of DNA synthesis, as revealed by the reduction of BrdU incorporation. At 72 hours, the lowest concentration of goniothalamin (2.3 μL) retained 97.6% of normal liver Chang cells proliferation while it reduced HepG2 cell proliferation to 19.8% as compared to control. Besides, goniothalamin caused accumulation of hypodiploid apoptosis and different degree of G2/M arrested as shown in cell cycle analysis by flow cytometry. Goniothalamin selectively killed liver cancer cell through suppression of proliferation and induction of apoptosis. These results suggest that goniothalamin shows potential cytotoxicity against hepatoblastoma HepG2 cells

Transdisciplinary Environmental Perspectives on a Shifting World: Ecotoxicants as Drivers of Change

Transdisciplinary Environmental Perspectives on a Shifting World: Ecotoxicants as Drivers of Chang

A Change in the Weather

Furman\u27s three institute\u27s take a yearlong look at climate chang

On The Panel Unit Root Tests Using Nonlinear Instrumental Variables

This paper re-examines the panel unit root tests proposed by Chang (2002). She establishes asymptotic independence of the t-statistics when integrable functions of lagged dependent variable are used as instruments even if the original series are cross sectionally dependent. She claims that her non-linear instrumental variable (NIV) panel unit root test is valid under general error cross correlations for any N (the cross section dimension) as T (the time dimension of the panel) tends to infinity. These results are largely due to her particular choice of the error correlation matrix which results in weak cross section dependence. Also, the asymptotic independence property of the t- statistics disappears when Chang's modified instruments are used. Using a common factor model with a sizeable degree of cross section correlations, we show that Chang's NIV panel unit root test suffers from gross size distortions, even when N is small relative to T