• Title, Summary, Keyword: VFA

Search Result 383, Processing Time 0.047 seconds

The Association Between Visceral Fat Area and Obesity Index (전산화 단층촬영과 생체 전기저항 분석법으로 측정한 내장지방과 비만관련 지표의 연관성)

  • Lim, Je-Yeon;Song, Yun-Kyung;Lim, Hyung-Ho
    • Journal of Korean Medicine Rehabilitation
    • /
    • v.21 no.4
    • /
    • pp.167-179
    • /
    • 2011
  • Objectives: In this study, we used with visceral fat area(VFA)/subcutaneous fat area(SFA) ratio(V/S ratio) and bioelectrical impedence analysis(BIA) for a comparative study between VFA measured from several abdominal computed tomography(CT) images and obesity indexes, such as body mass index(BM), waist circumference(WC), and waist-hip ratio(WHR). Methods: A group of 63 test subjects were gathered in the oriental medical hospital of Kyung-Won university. BIA for body composition and body size for obesity indexes were estimated to evaluate the obesity indexes. Pearson correlation coefficients and regression analysis were used to select useful obesity index. Results: The VFA-CT was significantly related to BMI, SFA, WC, hip circumference(HC), body fat mass(BFM), basal metabolic rate(BMR), and VFA-BIA. Especially, we found that the VFA-BIA and BMI were significantly correlated to VFA-CT. Conclusions: VFA-BIA index is an optimized index for diagnosis and evaluation of obesity. Finally, we found that the BMI is optimized to represent VFA.

Enbancement of Treatement Efficiency in a Biological Nutrient Removal Process by addition of Volatile Fatty Acids (휘발성 지방산의 주입을 통한 생물학적 영양염류 제거공정의 효율증진에 관한 연구)

  • Choung, Yoon Kyoo;Ko, Kwang Baik;Kim, Sue Jin;Yim, Seong Keun
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.10 no.3
    • /
    • pp.73-82
    • /
    • 1996
  • The removal efficiencies of organic substrates, nitrogen and phosphorus in the anaerobic-aerobic biological phosphorus removal process were investigated by addition of acetic acid, propionic acid and butyric acid which are normal volatile fatty acids contained in anaerobic digester supernatants. Substrate utilization coefficients for the phosphorus release and uptake were also estimated. The effect of a VFA, which showed higher phosphorus removal efficiency than the other VFAs did, was also studied in an anaerobic-aerobic-anoxic biological nutrient removal process. For the anaerobic-aerobic process added by VFA, the phosphorus removal efficiencies were up to about 68%, 55% and 61% for the reactors of acetic acid, propionic acid and butyric acid added, respectively, which indicates the efficiencies were increased by about 8-21%, comparing to that of 47% for the reactor with no VFA added. There were no significant difference in removal efficiencies for organic substrate and $NH_3-N$ without regard to addition of VFA. However, the removal efficiency of total nitrogen was increased in the case of VFA added, since $NO_3-N$ was less produced. For the anaerobic-aerobic-anoxic process added VFA, the removal efficiencies for $NH_3-N$ and $PO{_4}^{3-}-P$ were increased by 5% and 13%, respectively, comparing with them in the reactors not added VFA.

  • PDF

Is There any Role of Visceral Fat Area for Predicting Difficulty of Laparoscopic Gastrectomy for Gastric Cancer?

  • Shin, Ho-Jung;Son, Sang-Yong;Cui, Long-Hai;Byun, Cheulsu;Hur, Hoon;Lee, Jei Hee;Kim, Young Chul;Han, Sang-Uk;Cho, Yong Kwan
    • Journal of Gastric Cancer
    • /
    • v.15 no.3
    • /
    • pp.151-158
    • /
    • 2015
  • Purpose: Obesity is associated with morbidity following gastric cancer surgery, but whether obesity influences morbidity after laparoscopic gastrectomy (LG) remains controversial. The present study evaluated whether body mass index (BMI) and visceral fat area (VFA) predict postoperative complications. Materials and Methods: A total of 217 consecutive patients who had undergone LG for gastric cancer between May 2003 and December 2005 were included in the present study. We divided the patients into two groups ('before learning curve' and 'after learning curve') based on the learning curve effect of the surgeon. Each of these groups was sub-classified according to BMI (<$25kg/m^2$ and ${\geq}25kg/m^2$) and VFA (<$100cm^2$ and ${\geq}100cm^2$). Surgical outcomes, including operative time, quantity of blood loss, and postoperative complications, were compared between BMI and VFA subgroups. Results: The mean operative time, length of hospital stay, and complication rate were significantly higher in the before learning curve group than in the after learning curve group. In the subgroup analysis, complication rate and length of hospital stay did not differ according to BMI or VFA; however, for the before learning curve group, mean operative time and blood loss were significantly higher in the high VFA subgroup than in the low VFA subgroup (P=0.047 and P=0.028, respectively). Conclusions: VFA may be a better predictive marker than BMI for selecting candidates for LG, which may help to get a better surgical outcome for inexperienced surgeons.

Correlation between Non-Alcoholic Fatty Liver Disease and Visceral Adipose Tissue in Non-Obese Chinese Adults: A CT Evaluation

  • Yu, Ai-Hong;Duan-Mu, Yang-Yang;Zhang, Yong;Wang, Ling;Guo, Zhe;Yu, Yong-Qiang;Wang, Yu-Sheng;Cheng, Xiao-Guang
    • Korean Journal of Radiology
    • /
    • v.19 no.5
    • /
    • pp.923-929
    • /
    • 2018
  • Objective: To investigate the correlation between non-alcoholic fatty liver disease and visceral adipose tissue in non-obese Chinese adults using computed tomography (CT). Materials and Methods: The study included 454 subjects undergoing abdominal CT scan. Degree of CT attenuation in liver and spleen, and the degree of fat infiltration in liver were evaluated according to three indices: the attenuation value of liver parenchyma ($CT_{LP}$), the attenuation ratio of liver and spleen ($LS_{ratio}$) and the attenuation difference between liver and spleen ($LS_{dif}$). Visceral fat area (VFA) and total fat area (TFA) at L2/3 and L4/5 levels were measured, and the abdominal subcutaneous fat area (SFA) was calculated. Bivariate correlation analysis was carried out to determine the correlation among these factors. Results: In men, VFA, SFA and TFA at L2/3 and L4/5 levels showed significant differences in terms of the three indices to distinguish fatty liver from non-fatty liver (all, p < 0.001). In men, all the three indices showed negative correlation with TFA, SFA and VFA (all, p < 0.001). The negative correlation between the three indices and VFA at the L2/3 level was higher than at L4/5 level (r = -0.476 vs. r = -0.340 for $CT_{LP}$, r = -0.502 vs. r = -0.413 for $LS_{ratio}$, r = -0.543 vs. r = -0.422 for $LS_{dif}$, p < 0.001, respectively). The negative correlation between $LS_{ratio}$, $LS_{dif}$ and VFA at L2/3 and L4/5 levels was higher than SFA at the corresponding level. In women, all the three indices showed negative correlation with VFA and TFA at L2/3 and L4/5 levels, and the negative correlation between $CT_{LP}$ and VFA was higher at L2/3 level than at L4/5 level (r = -0.294 vs. r = -0.254, p < 0.001). Conclusion: In non-obese Chinese adults, the degree of hepatic fatty infiltration showed a strong correlation with abdominal fat on CT. VFA at L2/3 level was more closely related to fatty liver compared with VFA at L4/5 level.

A study of analytical method for volatile fatty acids (VFA) by cryogenic trapping-thermal desorption (CT-TD) technique (저온농축열탈착 시스템을 연계한 유기지방산의 분석법 평가 및 검토)

  • Ahn, Ji-Won;Kim, Ki-Hyun;Im, Moon-Soon;Ju, Do-Weon
    • Analytical Science and Technology
    • /
    • v.24 no.3
    • /
    • pp.200-211
    • /
    • 2011
  • In this study, 13 compounds including four volatile fatty acids (VFA) and nine volatile organic compounds (VOC) were analyzed by cryogenic trapping-thermal desorption technique. In order to evaluate the analytical method for VFA, calibration experiments were performed using five different sorbent materials. When the calibration results are compared between different sorbents, sampling tube filled with Carbopack X showed the highest response factor (RF) for both VFA and VOC. To validate this new analytical method for VFA using cryogenic trapping-thermal desorption technique, this method was compared with alkali absorption method recommended by the odor prevention law of the Korea Ministry of Environment (KMOE). For this purpose, unknown samples were analyzed by two different methods, i.e., cryogenic trapping-thermal desorption (TD) and alkali absorption with solid phase microextraction (SPME). When the results of two different methods were compared, ratios of concentrations determined by the two analytical methods (TD/SPME) was found as 0.46 (valeric acid) ~ 0.71 (isovaleric acid). Therefore, additional study is required to properly establish and find stable analytical conditions for VFA analysis. Furthermore, comparison between two different methods should be made with more reliable calibration approaches.

A review of analytical method for volatile fatty acids as designated offensive odorants in Korea (악취성 유기지방산 성분의 분석기술)

  • Ahn, Ji-Won;Kim, Yong-Hyun;Kim, Ki-Hyun;Song, Hee-Nam
    • Analytical Science and Technology
    • /
    • v.25 no.2
    • /
    • pp.91-101
    • /
    • 2012
  • A list of volatile fatty acids (VFA) including propionic acid, butyric acid, isovaleric acid, valeric acid, etc. is well known for offensive odorants. The analysis of odorant VFA is a highly delicate task due to high reactivity and unstable recovery rate. At present, analytical methods of VFA are recommended to include alkali impregnation filter method and alkali absorption method by the malodor prevention law of the Korea Ministry of Environment (KMOE). In this review, a survey has been made to explore various approaches available for the analysis of VFA to include both official methods of the KMOE and others. In light of the unreliability of those established analytical methods, it is highly desirable to develop some substituting methods for VFA. Among such options, one may consider such option as sorbent tube (ST) sampling and cryogenic trapping-thermal desorption technique. Moreover, procedures used for standard preparation, sampling steps, and instrumental detection stage are also evaluated. Application of container sampling (like Tedlar bag) is however not recommendable due to significant (sorptive) loss in sampling and in storage stage. In the detection stage, the use of GC/MS is recommendable to replace GC/FID due to the presence of diverse interfering substances. Thus, it is essential to properly establish the basic quality assurance (QA) for VFA analysis in air.

Effects of Dietary Acidogenicity Values on Rumen Fermentation Characteristics and Nutrients Digestibility

  • Choi, Y.J.;Lee, Sang S.;Song, J.Y.;Choi, N.J.;Sung, H.G.;Yun, S.G.;Ha, Jong K.
    • Asian-Australasian Journal of Animal Sciences
    • /
    • v.16 no.11
    • /
    • pp.1625-1633
    • /
    • 2003
  • This study was conducted to observe effects of dietary acidogenicity value (AV) on rumen fermentation characteristics and nutrients digestibility. The AV of feedstuffs was based on the dissolution of Ca from $CaCO_3$ powder added at the end of a 24 h in vitro fermentation. Three diets were formulated to be iso-energetic and iso-nitrogenous with different AV. Two experiments were involved in this study. In experiment 1, it appears that pH, $NH_3-N$ concentration and A:P ratio tended to decrease, but gas production, VFA production and DM disappearance tended to increase with increasing dietary AV. In experiment 2, the rumen pH tended to decrease in order of high AV>medium AV>low AV treatment, respectively. There were no significant effects of dietary AV on $NH_3-N$ concentration, enzyme activity and nutrient digestibility. In addition, total VFA and individual VFA concentrations tended to increase with increasing dietary AV without significance. In fact, we hypothesized that different dietary AV would affect rumen fermentation and nutrients digestibility because dietary AV was adjusted with fermentable carbohydrate sources. The present results indicate that differences in dietary AV between treatments were too small to affect rumen fermentation and its effects were minimal.

산란계의 Ceramics 급여 효과

  • 손장호
    • Proceedings of the Korea Society of Poultry Science Conference
    • /
    • /
    • pp.103-104
    • /
    • 2004
  • This study was evaluated the dietary affect of ceramics on laying performance, intestinal microflora population, NH$_3$ and VFA gas emission from excreta and fatty acids composition of egg yolk in laying hens. A total of 180 layer at 34 weeks of age were fed the experimental diets containing 0.0 % (Control), 0.4 % and 0.8 % of ceramics powder for 6 weeks. It is concluded that 0.4 % ceramics powder supplementation in the 34 to 40 weeks laying hens diet, improves the laying performance and ratio of egg yolk n-6/n-3 fatty acids contents and decreasing emission of NH$_3$ and VFA gas from excreta.

  • PDF