• Asian-Australasian Journal of Animal Sciences
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• 제24권8호
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• pp.1112-1119
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• 2011

The study aimed to evaluate the best level of licury oil in the diet of 3/4 Boer goats, as determined by profile analysis of commercial cuts on aspects of chemical composition, sensorial quality and fatty acid content. Nineteen male goats were used, with an initial weight of 10.8 kg/live weigh. The animals were fed with hay and a concentrated mix containing different levels of licury oil, which constituted the treatments. The experiment lasted for 60 days, at which point the animals were submitted to feed fasting and slaughtered. The carcass weight, commercial yield and cuts were measured. The ham was collected for sensorial and chemical evaluation and the longissimus dorsi was collected for fatty acid profile analysis. The addition of licury oil to the diet did not promote changes in the proportions and weights of the commercial cuts, nor to the meat's sensorial attributes. The sum of medium-chain fatty acids and the atherogenicity index was increased with the addition of oil. Licury oil can be added to the diet of goats (up to 4.5%) without resulting in changes in to the proportions of the commercial cuts, or to the chemical composition or sensorial characteristics of the meat. Based on the chain length of fatty acids, the addition of 4.5% licury oil can improve the quality of meat, but no effect was noted in relation to the atherogenicity index.

• 공업화학
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• 제8권2호
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• pp.197-203
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• 1997

본 연구에서는 폴리우레탄폼 제조시 사용되는 첨가제가 폴리우레탄폼의 기계적 물성에 미치는 영향에 대하여 조사하였다. 실험에 사용된 수지는 KONIX FA-703 폴리에테르폴리올(80%)과, KONIX FA-733 폴리에테르폴리올(20%)에 촉매, 계면활성제, 가교제 등을 혼합하여 제조하였으며, 이 수지에 이소시아네이트(TDI-80, prepolymer M-200, pure MDI)를 당량비로 첨가하여 발포시킨 폼을 상온에서 72시간 경화시킨 후 물성측정에 사용하였다. 폴리우레탄폼의 기계적 물성은 밀도, 인장강도, 인열강도, 신장율, 흡음율 및 gel profile을 조사함으로써 측정하였고, 셀 크기에 대한 계면활성제의 영향은 주사전자현미경(SEM)을 사용하여 측정하였다. 흡음율은 셀의 크기와 직접적인 관련이 있었으며, 계면활성제(L-5309)의 사용량에 따른 인장강도, 인열강도 및 흡음율 등 기계적 물성은 1.0pphp 까지는 첨가량이 많아질수록 증가하는 경향을 보이다가 점차 감소하였다.

• Asian Journal of Atmospheric Environment
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• 제2권2호
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• pp.90-101
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• 2008

The chemical compositions of $PM_{2.5}$ and $PM_{10}$ and associated high-molecular-weight polycyclic aromatic hydrocarbons (PAHs) were investigated during winter and summer at a roadside and an urban background site in Saitama, Japan. The average concentrations of $PM_{2.5}$ exceeded the United States Environmental Protection Agency standards during both periods. Carbonaceous components were abundant in both the observed and calculated (by means of a mass closure model) chemical composition of $PM_{2.5}$. Traffic-related pollutants (elemental carbon and high-molecular-weight PAHs) were strongly associated with $PM_{2.5}$ rather than with larger particles. The mass concentrations of $PM_{2.5}$, as well as those of EC and PAHs associated with the particles, at the two sites were strongly correlated. Comparison of our data with source profile ratios indicates that diesel-powered vehicles were probably the main source of the measured PAHs. The PAHs concentrations were affected by meteorological conditions during our study. Our results highlight the need for the establishment of standards for $PM_{2.5}$ in Japan.

• Journal of Photoscience
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• 제9권2호
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• pp.460-462
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• 2002

Absorption spectra of biological specimens in the soft X-ray region have been presented with special reference to the XANES (X-ray absorption Near Edge Structure) of constituent elements. Absorption spectrum in this wavelength region is characterized by the absorption edges from which elemental content could be derived. In addition, XANES has a characteristic profile for chemical environment around the element such as chemical bond. Using the specific absorption peak we can assign not only the chemical bond but also molecules having such a chemical bond. In the present paper, absorption spectrum of DNA was measured in the wavelength range from 1.5nm to 5nm. Spectrum of Chinese Hamster Ovary (CHO) cells was compared with the DNA spectrum. XANES were distinct at the K absorption edges of major elements, C, N and O. In the spectrum of the cells prominent peaks at the L absorption edge of minor element Ca were also detectable. XANES profiles in small local areas in a cell could also be measured in combination with X-ray microscopy. These give information about local chemical environment in a cell. XANES at the phosphorus K absorption edge in a human HeLa cell was successfully obtained corresponding to a sharp and intensive XANES peak of DNA.

• 천문학회보
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• 제35권2호
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• pp.73.2-73.2
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• 2010

In order to understand internal dynamics of starless cores, molecular line emissions are usually observed. From profiles of the molecular lines, internal motions of starless cores have been deduced using a simple radiative transfer model such as the two-layer model (Myers et al.1996). This brings complexities arising from the chemical evolution. The motivation of this study is to follow the chemical evolution of a starless core that goes through gravitational contraction. For this purpose, we have performed hydrodynamical simulations with a marginally unstable Bonnor-Ebert sphere as an initial condition. We follow the chemical evolution of this core with changing conditions such as the chemical reaction rate at the dust surface and the strength of radiation field that penetrate into the core. At the core center, the molecules suffer from a higher degree of molecular depletion on the dust covered by ice rather than on the bare silicate dust. The stronger radiation field dissociates more molecules at the core envelope. From analysis on the line profile using the two-layer model, we found that the speed of inward motion deduced from the HCN F = 2-1 line adequately traces the true infall speed, when the dust is covered by ice and the core is exposed to the diffuse interstellar radiation field. Under different conditions, the two-layer model significantly underestimate the infall speed.

• Journal of Microbiology and Biotechnology
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• 제12권4호
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• pp.687-691
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• 2002

To enhance the production of flavonoids [baicalin, wogonin-7-Ο-glucuronic acid (GA)], which are secondary metabolites of Scutellaria baicalensis Georgi(G.) plant cells, a multilayer perceptron control system was applied to regulate the substrate feeding in a fed-batch cultivation. The optimal profile for the substrate feeding rate in a fed-batch culture of S. baicalensis G. was determined by simulating a kinetic model using a genetic algorithm. Process variable profiles were then prepared for the construction of a multilayer perceptron controller that included massive parallelism, trainability, and fault tolerance. An error back-propagation algorithm was applied to train the multiplayer perceptron. The experimental results showed that neurocontrol incorporated with a genetic algorithm improved the flavonoid production compared with a simple fuzzy logic control system. Furthermore, the specific production yield and flavonoid productivity also increased.

• Bulletin of the Korean Chemical Society
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• 제31권6호
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• pp.1506-1508
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• 2010

$LiMnBO_3$ was successfully synthesized by a solid-state reaction method both with and without a carbon coating. Adipic acid was used as source material for the carbon coating. $LiMnBO_3$ was composed of many small polycrystalline particles with a size of about 50 - 70 nm, which showed a very even particle morphology and highly ordered crystalline particulates. Whereas the carbon coated $LiMnBO_3$ was well covered by mat-like, fine material consisting of amorphous carbon derived from the carbonization of adipic acid during the synthetic process. Carbon coated cell exhibited improved and stable discharge capacity profile over the untreated. Two cells delivered an initial discharge capacity of 111 and 58 mAh/g for $LiMnBO_3$/C and $LiMnBO_3$, respectively. Carbon coating on the surface of the $LiMnBO_3$ drastically improved discharge capacity due to the improved electric conductivity in the $LiMnBO_3$ material.

• Journal of Ginseng Research
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• 제42권3호
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• pp.334-342
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• 2018

Background: Panax notoginseng is a highly valued medicine and functional food, whose quality is considered to be influenced by the size, botanical parts, and growth environments. Methods: In this study, a HPLC method integrating fingerprinting and determination of multiconstituents by single reference standard was established and adopted to investigate the chemical profiles and active constituent contents of 215 notoginseng samples with different sizes, from different botanical parts and geographical regions. Results: Chemical differences among main root, branch root, and rotten root were not distinct, while rhizome and fibrous root could be discriminated from other parts. The notoginseng samples from Wenshan Autonomous Prefecture and cities nearby were similar, whereas samples from cities far away were not. The contents of major active constituents in main root did not correlate with the market price. Conclusion: This study provided comprehensive chemical evidence for the rational usage of different parts, sizes, and growth regions of notoginseng in practice.

• Journal of Pharmaceutical Investigation
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• 제34권4호
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• pp.305-310
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• 2004

This study was to prepare the anionic liposomes which were to release anticancer drug (doxorubicin) at the hyperthermia temperature $({\sim}42^{\circ}C)$ and to stabilize in bovine serum solution at $37^{\circ}C$. The vesicle size and zeta potential of liposomes in Tris-HCl buffered solution (pH 7.4) were measured by an electrophoretic light scattering spectrophotometer. To estimate the stability of liposomes, liposome size was measured in bovine serum solution at $37^{\circ}C$ for 72 h. The release of doxorubicin from liposome was determined by measuring the fluorescence intensity using fluorescence spectrophotometry with temperature and time. The size of liposomes was from 120 to 160 nm and zeta potential was from $-33.3{\pm}2.4$ to $-75.6{\pm}6.9\;mV$. Anionic liposome was stabilized in bovine serum solution at $37^{\circ}C$ within 72 h. Additionally, the release transition temperature of doxorubicin from liposomes was increased by increasing mole % of anionic phospholipid.

• 한국지구과학회지
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• 제26권8호
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• pp.800-808
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• 2005

광주광역시 향등지역에서 화강암의 풍화에 따른 토양단면의 지화학적 특성을 파악하기 위하여 11개의 시료를 화학분석 하였다. 모암에서부터 풍화암까지 주성분원소 중 Si, Ca, Na, Mg, P, Mn은 감소하고 Ti, Fe, K는 증가하는 경향을 보인다. 미량성분원소의 경우 Rb, Sr, Pb, Ba은 증가하는 경향을 보이며, As, Co늘 감소하는 경향을 보인다. 또한 Zn, Cr, Ni등은 부분적으로 집적된 경향을 보이나 전체적으로는 모암과 풍화토에서 거의 비슷한 함량을 갖는다. 희토류원소는 전체적으로 상부로 갈수록 증가하는데 경희토류원소(LREE)는 풍화초기에 기반암에서 용탈되어 풍화암(saprock)에서 집적되지만, 중희토류원소(HREE)의 경우는 상대적으로 집적되지 못하여 풍화초기에 약간 감소하는 경향을 나타낸다.