• Title, Summary, Keyword: ESR

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Detection of Gamma-Irradiation Treatment in Imported Spices by ESR Spectroscopy (ESR spectroscopy에 의한 감마선 조사된 수입 향신료의 검지)

  • Han, Jeong-Eun;Lee, Eun-Jeong;Yang, Jae-Seung
    • Korean Journal of Food Science and Technology
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    • v.35 no.6
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    • pp.1060-1063
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    • 2003
  • Electron spin resonance (ESR) spectroscopy was used to investigate the effects of irradiation doses and storage times on three spices. Three imported spices (Brassica juncea, Origanum vulgare, Laurus nobilis) were irradiated with doss of 0, 1, 5 and 10 kGy using a Co-60 irradiator at room temperature. ESR signals were measured from each sample by a Bruker-EPR spectrometer. The gamma-irradiated Brassica and Laurus nobilis exhibited characteristic signals, which were different from those of the non-irradiated ones. Non-irradiated and irradiated Origanum vulgare exhibited single lines, with higher ESR signals in irradiated sample than in non-irradiated sample. The ESR signals increased linearly with increasing irradiation doses $(1{\sim}10kGy)$. A strong positive correlation coefficient $(R^2=0.9939{\sim}0.9993)$ was obtained between the irradiation doses and the corresponding ESR signal intensities. Although the ESR signal intensities decreased with storage time, signals from the three irradiated spices were observed even after 12 weeks of storage at room temperature.

Detection of Gamma-Irradiated Spices by ESR Spectroscopy (ESR Spectroscopy에 의한 감마선 조사된 향신료의 확인)

  • 양재승;남혜선
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.30 no.2
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    • pp.239-242
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    • 2001
  • Electron spin resonance(ESR) spectroscopy was used to investigate the effect of irradiation dose on the ESR signal intensity of irradiated spices and to identify the stability of radicals after storage. Red, white and black peppers, and garlic powders were irradiated with doses of 0, 1, 5, 10, 20 and 30 kGy at room temperature using a Co-60 irradiator. Triplet ESR signals were observed in irradiated pepper powders, while singlet ESR signals were observed in irradiated garlic powders. Those characteristic signals were not detected in non-irradiated samples. The strength of ESR signals linearly increased with the applied doses(1~3 kGy). Highly positive correlation coefficients ($R^2$=0.9757~0.9933) were obtained between the irradiation doses and the corresponding ESR signal intensities. The signal intensities of irradiated samples were stable even after 97 days of storage at room temperature.

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Indirect calculation for volume of packed red cell(VPRC) by means of erythrocyte sedimentation rate(ESR) of diluted blood in dogs (개 회석혈의 적혈구침강율(ESR)에 의한 적혈구 침층용적(VPRC)치의 간접계산법)

  • Lee, Bang-whan;Park, Young-jun
    • Korean Journal of Veterinary Research
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    • v.29 no.2
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    • pp.41-49
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    • 1989
  • The study was undertaken to obtain indirect values of volume of packed red cell (VPRC) without centrifugation, using the erythrocyte sedimentation rate (ESR) of diluted blood in dogs. ESRs of diluted blood using the diluent of autologous plasma in which formed numerous RBC-rouleau clumps, autologous serum in which formed a few RBC-rouleau clumps, and 5% dextrose or 6% sucrose solutions in which formed numerous RBC-aggregation clumps, were accelerated. But, ESR of diluted blood using the 0.9% saline, D-S, ACD-B, CDP or D-PBS solutions were sluggish, because erythrocytes were dispersed in these diluents. Reliable values of VPRC on the basis of the correlating regressive equation to the ESR could be derived from values of$60^{\circ}$-angled-micro-ESR/40 min in the mixture, four parts of 5% dextrose solution and one part of whole blood. In the ESR values of diluted blood with low ratio, 1:1~3:1, $60^{\circ}$-micro-ESR was higher than $60^{\circ}$-Wintrobe-ESR. But, in the diluted blood with high ratio, 4:1~5:1, there was no different ESR values. For an aid of practical use, authers suggested a list of the $60^{\circ}$-micro-ESR/40 min in the diluted blood with equivalent VPRC of whole blood.

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The Related Factors to Workplace Bullying in Nursing: A Systematic Review and Meta-analysis (간호사간 직장 내 괴롭힘 관련변인에 대한 체계적 문헌고찰과 메타분석)

  • Kang, Jiyeon;Lee, Minju
    • Korean Journal of Adult Nursing
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    • v.28 no.4
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    • pp.399-414
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    • 2016
  • Purpose: The purpose of this study was to review and identify factors relevant to workplace bullying in nursing. Methods: Twenty-three studies that met the criteria were selected from a sample of twenty-six studies. These articles were retrieved from a central literature databases (N=13,241). The total correlational effect size (ESr) for each related factor was calculated from Fisher's Zr. A funnel plot inspection (similar to scatter plot) with a trim-and-fill method was used to assess the publication bias of the meta-analyzed studies. Results: From the systematic review, fifty-one factors were identified as having an influencing effect. Fourteen factors (five individual and nine organizational factors) were eligible for meta-analysis. The individual factors included, self-esteem (ESr=-.31), psychological capital (ESr=-.26), and marital status (ESr=-.06) which were significantly correlated with workplace bullying. Organizational factors included, organizational tolerance (ESr=.48), supervisor incivility (ESr=.47), job stress (ESr=.46), group morale (ESr=-.36), group support (ESr=-.35), supervisor leadership (ESr=-.35), group identity (ESr=-.33), and structural empowerment (ESr=-.27). These factors were significantly correlated with workplace bullying. There were no publication biases except for both individual and organizational factors. Conclusion: Organizational factors have more of an greater impact than individual factors on workplace bullying. The results of this study support the need for intervention at the organizational level.

ESR dosimetry and Dating toward $21^{st}$ Century

  • Ikeya, Motoji
    • Journal of the Korean Magnetic Resonance Society
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    • v.6 no.2
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    • pp.84-88
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    • 2002
  • Dating and dosimetry using electron spin resonance (ESR) in 20th Century developed at both Yamaguchi University and Osaka University have been reviewed with emphasis on new prospects and strategies in 21th century. Natural radiation have been generating radicals that accumulated in archaeological and geological materials. ESR detects these radicals and the ESR signal intensity is proportional to the radiation dose and therefore the age. The assessment of the total dose of natural radiation and the annual dose rate give their ESR ages. The ESR dating of stalactites and stalagmites ant Akiyoshi cave in Yamaguchi prefecture in 1975 was extended to anthropological dating using bones and tooth enamel excavated in Greek Petralona cave. Fossils of shells and corals gave the ages of marine terraces and sea-level changes. Quartz grains gave the ages of geothermal alteration and fault movements. Future ESR dating of ices at outer planets anf their satellite are also investigated as basic studies for ices od $H_2O,\;CO_2,\;SO_2$ as well as terrestrial hydrates in laboratory. Atomic bomb radiation dosimetry at Hiroshima and Nagasaki using ESR lead to the dosimetry of personnel, Chemobyl and JCO criticality accidents. Monitoring of radiation dose with sensitive materials with tissue equivalence are being developed. finally a new scanning ESR imaging apparatus (a near field microwave microscope) developed in our laboratory gave ESR images of Radicals from fossils to Si-CVD and diamond films as summarized in my book in 2002.

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Identification of Irradiated Fishes by ESR Spectroscopy (방사선 조사 어류의 ESR Spectroscopy를 이용한 확인)

  • 님혜선;우시호;이선영;양재승
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.29 no.3
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    • pp.425-429
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    • 2000
  • 본 연구는 ESR spectroscopy를 이용하여 어류의 방사선 조사 여부와 조사선량에 따른 ESR 신호의 크기 및 신호의 안정성을 확인하였다. 실험결과 방사선 조사된 어류는 g1=2.003$\pm$0.001과 g2=1.998$\pm$0.003에서 특유의 비대칭적인 ESR 신호를 나타내어 비조사시료와 확실하게 구별되었다. 조사선량의 증가에 따른 ESR 신호의 상관성에 있어서는 R2값이 0.9077~0.9989의 범위로 거의 모든 시료에서 조사선량에 따라 ESR 신호의 크기는 비례적으로 증가하였다. 또한 이들 신호의 크기는 5$^{\circ}C$에서 12주간 저장한 시료에서도 안정하게 남아 있어 방사선 조사여부의 판별은 장기간의 저장에서도 가능하였다. 따라서 ESR spectroscopy를 이용한 방사선 조사 어류의 검지 방법은 빠르고 확실하며 반(semi) 정량적인 방법으로써 유용한 검지기술임을 알 수 있었다.

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Angled Tube Method for Determining Erythrocyte Sedimentation Rate of Cattle (경사관법(傾斜管法)에 의한 우혈액(牛血液)의 적혈구침강율(赤血球沈降率) 측정(測定))

  • Lee, Bang-whan;Shin, Jong-uk
    • Korean Journal of Veterinary Research
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    • v.26 no.1
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    • pp.175-185
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    • 1986
  • The measurement of angled erythrocyte sedimentation rate (ESR), as a replacement for perpendicular ESR, for cattle blood was scrutinized since it has been well known that perpendicular ESR in cattle is too slow to be adopted as an effective clinical test. Samples of blood were taken from 186 Korean native cattle over 2 years old. The results obtained in the experiment were summarized as follows. 1. Average values of perpendicular ESR/24hrs in 15 apparently healthy cattle, as measured by Wintrobe, Westergren and capillary tubes, were $5.8{\pm}2.2$, $11.1{\pm}3.7$ and $10.4{\pm}4.5%$ respectively, which were found to be similar to the values of perpendicular ESR/hr of normal blood of human. 2. The ESR was determined in the tubes held at 90, 75, 60, 45, 30 and 15-degree angles, using 3 types of tubes. For the diagnostic purposes, the best results were obtained from the tubes held at 45-degree angle. 3. The angled ESR values increased as the diameters of the tube-bores decreased. 4. The tube length did not affect the angled ESR(%). 5. The angled ESR values increased with the increased environmental temperature during the ESR measurement. 6. The storage temperature at $5^{\circ}C$, $20^{\circ}C$ and $35^{\circ}C$, of the blood for 24 hours did not affect the angled ESR. 7. Samples of blood were treated with 4 kinds of anticoagulants (heparin, $K_2$-EDTA, double oxalate and sodium citrate) and the ESR was determined at 45-degree angle, using capillary hematocrit tubes. The ESR values were higher in the blood samples treated with sodium citrate than in those treated with other anticoagulants. 8. By using the autologous plasma, the PCV was adjusted to be 5, 10, 20, 30, 40 and 50ml/100ml and the ESR was determined in the capillary hematocrit and Wintrobe tubes held at 45 degrees. In both of the methods the ESRs increased as the values of PCV decreased. The regressions of ESR to PCV in both 45-degree-angled capillary and Wintrobe tubes were curvilinear. For the capillary hematocrit tubes the second degree polynomial $Y=61.9779-2.3533x+0.0228x^2$ (r=0.9999) fits the data. And in the case of Wintrobe tubes the second degree polynomial $Y=27.9767-1.1314x-0.0117x^2$ (r=0.9998) fits the data. 9. The 45-degree angled ESR was determined in the blood of 71 healthy Korean native cows using capillary hematocrit tubes. The average PCV was $35.4{\pm}3.6ml/100ml$. The observed ESR/hr averaged $7.2{\pm}2.7%$, while the corrected ESR/hr to a PCV of 36ml/100ml averaged $6.6{\pm}1.3%$. From these results it was concluded that to obtain the best results the ESR/hr of Korean native cattle should be determined at 45-degree angle at room temperature($20^{\circ}C$) using capillary hematocrit tubes.

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Identification of Irradiated Chicken Eggs by ESR Spectroscopy (ESR spectroscopy를 이용한 방사선 조사 계란의 확인)

  • 남혜선;이선영;양재승
    • Journal of Food Hygiene and Safety
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    • v.15 no.3
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    • pp.248-251
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    • 2000
  • Electron spin resonance (ESR) spectroscopy was used to detect irradiated chicken eggs, to investigate the effect of irradiation dose on the ESR signal intensity and to identify the stability of radicals under 77 days of storage. Raw chicken eggs were irradiated with doses of 0, 0.5, 1, 2, 3 and 5 kGy at room temperature using a Co-60 irradiator. The samples were prepared by separating, drying and powdering shells from the raw eggs. The irradiated chicken egg shells presented an asymmetric absorption in shape at g$_1$=2.0023$\pm$0.00004 and g$_2$=1.9979$\pm$0.00005, different from the non-irradiated ones. The strength of the ESR signal increased linearly with the applied doses (to S kGy). The intensity of the ESR signals after irradiation were stable even after 77-day of storage at 5$^{\circ}C$ and/or room temperature.

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Detection of Gamma-Irradiated Dried Vegetable Using ESR Spectroscopy (감마선 조사 건조채소의 ESR 검지)

  • Han, Jeong-Eun;Yang, Jae-Seung
    • Korean Journal of Food Science and Technology
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    • v.36 no.2
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    • pp.345-348
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    • 2004
  • Dried cabbage, spinach, carrot, mugwort and yam were irradiated at 1, 5 and 10 kGy using a $^{60}Co$ irradiator at room temperature. Effects of irradiation dose and storage time on irradiated dried vegetables were investigated through electron spin resonance (ESR) spectroscopy. Strong positive correlation coefficients ($R^{2}=0.9698-0.9915$) were obtained between irradiation dose and corresponding ESR signal intensity. ESR signal of mugwort was most stable at 9 weeks storage, followed by carrot, yam, and spinach, whereas that ESR signal of cabbage was not distinguishable.

ESR Spectroscopy for Detecting Gamma-Irradiated Shellfishes (방사선 조사된 조개류의 확인을 위한 ESR Spectroscopy의 이용)

  • 남혜선;양재승
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.30 no.1
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    • pp.43-47
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    • 2001
  • Electron spin resonance (ESR) spectroscopy was used to investigate the effect of irradiation dose on the ESR signal intensity and to identify the stability of radicals after 9 weeks of storage in order to detect irradiated shellfishes. The irradiated shellfishes (short-necked clam, purplish washington clam, freshwater clam, jackknifed clam, scallop and hard-shell mussel) presented an asymmetric absorption in shape at $g_{1}$=2.002~2.003 and $g_{2}$=1.998. The strength of the ESR signal increased linearly with the applied doses (1~7 kGy). A highly positive correlation coefficients ($R^{2}$=0.9136~0.9896) were obtained between the irradiation dose and corresponding ESR signal intensity. The intensity of the signals after irradiation was stable even after 9 weeks of storage at 5$\pm$1$^{\circ}C$.

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