• Asian-Australasian Journal of Animal Sciences
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• v.23 no.7
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• pp.867-872
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• 2010

A comprehensive study was undertaken to evaluate the effect of naked neck (Na) gene on immune competence, serum biochemical parameters and carcass quality traits in three genotypes (NaNa, Nana and nana) of the naked neck chicken under a tropical climate (Southern India). Sixty day-old chicks (20 from each genotype) were selected randomly and reared under similar environmental conditions up to eight weeks of age. The cell mediated immune (CMI) response to phytohaemoagglutinin-P (PHA-P) was significantly higher ($p{\lgq}0.01$) in NaNa and Nana genotypes compared to nana birds. The humoral response as measured by antibody titre to sheep red blood cells (SRBC) was also significantly higher in NaNa. The total cholesterol, LDL and VLDL cholesterol levels were significantly ($p{\leq}0.01$) lower whereas HDL cholesterol level was significantly higher in NaNa and Nana compared to nana genotype. The presence of Na allele significantly increased the live weight and dressing yield, and decreased the feather cover and abdominal fat. The naked neck genotypes (NaNa/Nana) performed better than the normal (nana) siblings for almost all the traits studied.

• Journal of Environmental Science International
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• v.11 no.1
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• pp.75-83
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• 2002

The removal performance of copper ion was studied using Na-P1 zeolites synthesized from Jeju scoria. The scoria which is found in large amounts in Jeju Island, was sampled at four regions, Jeju-shi Bonggae-dong(A). Pukcheju-gun Hanlim-eup Sangmyong-ri Mangoreum(B), Pukcheju-gun Hanlim-eup Keumag-ri(C) and Namcheju-gun Andeok-myun Dongkwang-ri(D). Synthetic Na-P1 zeolites used in this study were more effective than natural zeolite and scoria for the removal of copper ion. The removal performances of copper ion decreased in the order of Na-P1(D) > Na-P1(C) > Na-P1(B) > Na-P1(A) among Na-P1 synthesized from the scoria according to region. These results showed the same trend with cation exchange capacity(CEC) for each synthetic zeolite, i.e., the synthetic Na-P1 zeolite with a higher CEC showed a higher removal performance. The effective diffusion coefficients of copper ion by synthetic Na-P1 zeolites were one hundred and ten times higher than those by a pure zeolite 4A and the zeolite A synthesized from coal fly ash, respectively.

• Korean Journal of Environmental Biology
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• v.19 no.2
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• pp.107-112
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• 2001

A tissue biosensor was developed for the continuous determination of $Na^+$ channel blockers. The proposed sensor was applied to the determination of Na+ channel blockers in seaweed. It was found that $Na^+$ channel blocker content displayed seasonal variation; it was high from February to April and decreased thereafter (May - August). From these results the present proposed method may be used for high sensitive determination of $Na^+$ channel blockers contained in the seaweed organisms and environments. Therefore, it may be important to monitor $Na^+$ channel blocker content of seaweed throughout the year.

• Solar Energy
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• v.19 no.2
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• pp.57-65
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• 1999

In this study $H_2O$-NaCl mixture was selected as a cold thermal storage material and its phase change temperature($liquid{\Leftrightarrow}solid$) was controlled with the molar concentration of NaCl. Ion dipole interaction mechanism and the fusion and crystallization structure of $H_2O$-NaCl were visualized with the low and high concentration of NaCl in the heating and cooling processes. In this study, the original cause of the appearance of two steps phase change period in heating and cooing processes were found by the visualization of the ion dipole interaction mechanism of $H_2O$-NaCl, and the theoretical equation of the phase change temperature variation in the NaCl high molar concentration was rearranged.

• KSBB Journal
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• v.13 no.1
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• pp.71-76
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• 1998

Tissue biosensor for mearsuring sodium channel blockers, such tetrodotoxin(TTX), saxitoxin (STX) and paralytic shellfish poisoning(PSP) consisted of frog bladder membrane, and $Na^{+}$ electrode. The proposed biosensor was applied to determine Chinese drug and dry or wet Porphyra yezonesis $Na^{+}$ channel blockers below the detection limit of the standard mouse bio-assay while the observed detection limit didn't cause human poisoning. The proposed biosensor system may be used for future $Na^{+}$ channel blockers monitoring within the marine environment.

• Journal of the Korean Ceramic Society
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• v.46 no.6
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• pp.689-694
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• 2009

Layer-structured $Na_xCo_2O_4$ was synthesized from $Na_2CO_3\;and\;Co_3O_4$ powders. The chemical concentrations of Na and additive were controlled to enhance the thermoelectric properties over the temperature range from 400 K to 1,150 K. As a result, we obtained the maximum thermoelectric properties at a single phase region with Na content of x=1.5. When Na content was smaller than x=1.5, the thermoelectric properties was low due to formation of second phases of CoO and other oxides. Additionally, Mn was doped to improve thermoelectric properties by means of decreasing thermal conductivity. The results showed that the concentrations of both Na and Mn are all governing factors to determine the thermoelectric properties of $Na_xCo_2O_4$ system.

• 한국HCI학회:학술대회논문집
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• 2006.02b
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• pp.480-486
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• 2006

본 연구는 대학생을 대상으로 사이버 강좌에서 사용되는 세가지 정보제시 유형에 따라 학습자의 학습 수행, 콘텐츠 만족도, 그리고 학습성취 기대감에 어떤 차이가 있는지를 알아보고자 하였다. 이에 공기펌프 작동원리, 브레이크 작동원리, 번개형성과정의 세가지 과제를 나레이션+텍스트(na+text), 나레이션+삽화(na+illust), 나레이션+애니메이션(na+ani)의 세가지 정보제시 유형의 콘텐츠를 제작하였다. 먼저 학습수행에 있어서는 브레이크 과제에서 정보제시 유형별 유의한 차이가 나타났으며 세가지 정보제시 유형 모두에서 na+illust, na+ani, na+text 조건 순으로 성취가 높았다. 번개형성과정에서도 정보제시 유형별 유의한 차이가 있었고, na+text, na+ani, na+illust 의 순으로 학습성취가 높은 것으로 나타났다. 콘텐츠 만족도에 있어서는 공기펌프와 브레이크 과제 모두에서 제시유형별로 유의한 차이가 있는 것으로 나타났으며, na+ani, na+illust, na+text 순으로 만족하는 것으로 나타났다. 학습성취에 대한 기대감도 공기펌프와 브레이크 과제 모두에서 유의한 차이가 있으며, 그 순서는 만족도와 동일하였다. 이 연구의 결과는 나레이션이 제공되는 3 가지 정보제시 유형의 콘텐츠를 학습함에 있어 학습과제와 학습과제 제시 유형에 따른 학습 수행의 차이를 확인할 수 있었다. 또한 이러한 학습수행 결과는 피험자의 콘텐츠 만족도와 학습 성취 기대감과는 다른 패턴을 보임으로써 정보제시 유형에 대한 평가와 실제 학습수행과는 차이가 있음을 시사한다.

• Carbon letters
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• v.16 no.2
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• pp.116-120
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• 2015

We investigated the adsorption of Na on graphene and graphene oxide, which are used as anode materials in sodium ion batteries, using density functional theory. The adsorption energy for Na on graphene was -0.507 eV at the hollow sites, implying that adsorption was favorable. In the case of graphene oxide, Na atoms were separately adsorbed on the epoxide and hydroxyl functional groups. The adsorption of Na on graphene oxide-epoxide (adsorption energy of -1.024 eV) was found to be stronger than the adsorption of Na on pristine graphene. However, the adsorption of Na on graphene oxide-hydroxyl resulted in the generation of NaOH as a by-product. Using density of states (DOS) calculations, we found that the DOS of the Na-adsorbed graphene was shifted down more than that of the Na-adsorbed graphene oxide-epoxide. In addition, the intensity of the DOS around the Fermi level for the Na-adsorbed graphene was higher than that for the Na-adsorbed graphene oxide-epoxide.

• Journal of the Korean Magnetics Society
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• v.5 no.3
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• pp.175-178
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• 1995

The temperature dependence of $^{23}Na$ nuclear magnetic resonance in a $NaMnCl_{3}$ single crystal grown by the Czochralski method has been investigated by employing a Bruker FT NMR spectrometer operating at 4.7 T. The quadrupole coupling constant of $^{23}Na$ in $NaMnCl_{3}$ increases as the temperature increases. The temperature dependence of $e^{2}qQ/h$ may be fitted with a linear equation of the form $e^{2}qQ/h=155+0.117(T-T_{r})\;kHz$ for the temperature range of 140-380 K.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.41 no.6
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• pp.665-671
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• 1996

The salt stress at seedling stage of barley was examined in different concentrations of NaCl containing 1/2 Hoagland solution. Among the physiological factors electric conductivity and sodium content of cell sap outflow solution were increased according to the in-crease of NaCl concentration in 1/2 Hoagland solution but the total protein content of root cell sap outflow solution was decreased. Changing pattern of amino acids content in plant was divided into 3 groups which were increased, decreased or unchanged by NaCl concentration in solution. In normal condition, sugar content in plant was higher than potassium or sodium but if NaCl was added more than 25mM in 1/2 Hoagland solution, sodium was the highest. Potassium content in shoot was decreased as 67% of control at 100mM of NaCl containing solution and in root it was decreased as 8%. Sum of the potassium and sodium content in shoot was seriously increased in accordant with NaCl concentration in culture solution, but in root it was gradually decreased. Chlorophyll content per g fresh weight and photosynthetic ability per $\textrm{cm}^2$ in first leaf were not affected by NaCl concentration of 1/2 Hoagland solution but root activity was slightly decreased compared to control.