• Title/Summary/Keyword: Optimal control period

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Feeding Acacia saligna to Sheep and Goats with or without the Addition of Urea or Polyethylene Glycol

  • Krebs, G.L.;Howard, D.M.;Dods, K.
    • Asian-Australasian Journal of Animal Sciences
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    • v.20 no.10
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    • pp.1551-1556
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    • 2007
  • The objective of the research was to investigate the effect of polyethylene glycol (PEG) or urea supplementation in sheep and goats fed a basal diet of Acacia saligna and wheat straw. The 3 dietary treatments were: (1) Control: ad libitum A. saligna+ 400 g/d wheat straw (95% DM) (basal diet); (2) Basal diet+50 g/d PEG 4000; and (3) Basal diet+1% (on a DM basis) urea sprayed onto the straw and A. saligna 30 min prior to feeding. All animals maintained live weight, regardless of the dietary treatment. All sheep readily consumed the A. saligna in preference to straw. In sheep both DMD and OMD were higher (p<0.05) where PEG was included in the diet compared to the other two treatments. Contrary to findings by other researchers there was no significant difference in DMI, DMD or OMD between sheep and goats in corresponding treatment groups. All animals were in positive N balance. For both sheep and goats, rumen ammonia concentrations were increased with the use of either urea or PEG. In these groups the maximum ammonia concentrations exceeded 50 mg/L, considered the minimum required to maximise microbial growth. This threshold, however, was exceeded only for a period of 8-11 h. Of those measured, rumen ammonia levels were generally the highest at 4 h post feeding. None of the measurements of rumen ammonia for the control group approached 50 mg/L. It is unclear how and why feed intake and live weight were maintained when rumen ammonia levels were often sub-optimal.

Gamma Knife Radiosurgery for Juxtasellar Tumors (터어키안 주변종양에 대한 감마나이프 방사선 수술)

  • Chang, Jong Hee;Chang, Jin Woo;Park, Yong Gou;Chung, Sang Sup
    • Journal of Korean Neurosurgical Society
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    • v.29 no.10
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    • pp.1345-1351
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    • 2000
  • Objective : Around the sellar area, there are many important structures. But, the optimal radiation dosage for minimal toxicity to surrounding neural tissue has not been firmly established. The purpose of this study is to evaluate the radiosurgical outcome of juxtasellar tumors and to investigate the relationship between radiation dosage and toxicity to neural tissue. Method : Between May 1992 and June 2000, we treated 65 juxtasellar tumors by using the Leksell Gamma Knife. Among them, 52 patients who could be followed more than 1 year were included in this study. The radiosurgical dosage to the optic pathway, cavernous sinus, Meckel's cave, hypothalamus, pituitary gland and stalk, and brain stem was analyzed and correlated with clinical outcome. The mean follow-up period was 33.5 months(range 12.2- 99.0 months). Result : The clinical response rate was 69.2%. The volume response rate was 61.0% and the radiologic control rate was 92.7%. There were 4 complications(7.7%) of 2 trigeminal neuropathy, 1 abducens nerve palsy, and 1 trigeminal and transient abducens nerve palsy. The optic apparatus appeared to tolerate doses greater than 10Gy. The risk of cranial nerve complications in cavernous sinus seemed to be related to doses of more than 16Gy. In 3 of 4 patients who received more than 16Gy to cavernous sinus, the abducens or trigeminal neuropathy occurred. Also, one patient who received more than 15Gy to the Meckel's cave, trigeminal neuropathy developed. The hypothalamus, pituitary gland and stalk, and brain stem were relatively tolerable to radiation. Conclusion : Gamma Knife radiosurgery seems to be an effective method to control the growth of juxtasellar tumors. To avoid injury to surrounding important neural tissue, careful dose planning and further study for radiation toxicity to neural tissue were needed.

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Studies on the Leaf Vase Life of Hosta Cultivars (Hosta 품종의 절엽 수명에 관한 연구)

  • Hong, Hoon-Ki;Lee, Jong-Suk
    • Journal of Bio-Environment Control
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    • v.19 no.4
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    • pp.223-228
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    • 2010
  • This experiment was conducted to select optimal cultivars of long leaf vase life for flower arrangements among 21 Hosta cultivars that were selected based on their ornamental value. As a result of the investigation, the cultivar with the longest leaf vase life was 'June' with 29 days record. The cultivars with a more than 10 days record were 'Remember Me', H. lancifolia var. grandiflora, 'Grand Marquee', 'Dress Blue', 'Blue Dimples', 'Frosted Dimples', 'Birchwood Park's Gold', 'Krossa Regal', and 'Paradise Power'. These 10 cultivars had a high chlorophyll content, and had low chlorophyll content changes over time and were high in water absorption. The 10 selected cultivars had equal characteristics of increase in chlorophyll content within a certain period of time. These cultivars have a longer vase life when compared to others. This indicates the potential to develop better materials be use with flower arrangements.

Diagnostic Value of Fecal Calprotectin as a Screening Biomarker for Gastrointestinal Malignancies

  • Khoshbaten, Manouchehr;Pishahang, Parinaz;Nouri, Mohammad;Lashkari, Alireza;Alizadeh, Mahasti;Rostami-Nejad, Mohammad
    • Asian Pacific Journal of Cancer Prevention
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    • v.15 no.4
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    • pp.1667-1670
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    • 2014
  • Background: Calprotectin in feces seems to be a more sensitive marker for gastrointestinal (GI) cancers than fecal occult blood, but its specificity may be too low for screening average risk populations. This study aims at evaluating the diagnostic value of fecal calprotectin as a screening biomarker for GI malignancies. Materials and Methods: In a case-control study, 100 patients with GI malignancies (50 patients with colorectal cancer and 50 patients with gastric cancer) and 50 controls were recruited in Tabriz Imam Reza and Sina hospitals during a 24-month period. One to two weeks after the last endoscopy/colonoscopy, fecal specimens were collected by the patients and examined by ELISA method for quantitative measurement of calprotectin content. The results were compared between the three groups. Results: The mean fecal calprotectin level was $109.1{\pm}105.3$ (2.3-454.3, median:74), $241.1{\pm}205.2$ (3.4-610.0, median:19.3) and $45.9{\pm}55.1{\mu}g/g$ (1.3-257.1, median:19.3) in gastric cancer, colorectal cancer and control group, respectively, the differences being significant (p<0.001) and remaining after adjustment for age. The optimal cut-off point for fecal calprotectin was ${\geq}75.8{\mu}g/g$ for distinguishing colorectal cancer from normal cases (sensitivity and specificity of 80% and 84%, respectively). This value was ${\geq}41.9{\mu}g/g$ for distinguishing gastric cancer from normal cases (sensitivity and specificity of 62%). Conclusions: Our results revealed that fecal calprotectin might be a useful and non-invasive biomarker for distinguishing colorectal cancer from non-malignant GI conditions. However, due to low sensitivity and specificity, this biomarker may not help physicians distinguishing gastric cancer cases from healthy subjects.

Effects of Paclobutrazol and Prohexadione-Ca on Seed yield, and Content of Oils and Gibberellin in Flax Grown in a Greenhouse

  • Kim, Sang-Kuk;Han, Chae-Min;Shin, Jong-Hee;Kwon, Tae-Young
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.63 no.3
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    • pp.265-271
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    • 2018
  • We investigated the effect of paclobutrazol (PB) and prohexadione-Ca (PC) on seed yield, and the content of oils and endogenous gibberellin in flax grown in a greenhouse. Flax seedlings were cultivated in a greenhouse with average ambient temperature ranging from $35^{\circ}C$ to $38^{\circ}C$ during the growing period, and then PB and PC were applied on the leaves. The height of flax plants was reduced significantly by the foliar application of PB and PC. The highest ripening seed rate recorded was 94.5% with 2000 ppm PC; a 10.3% increase compared with that of the control. Both PB and PC markedly increased the fructification of flax seed. The application of two plant growth retardants resulted in higher seed production in flax seedlings grown in open field than in those grown in a greenhouse. The highest oil content was observed in flax treated with PC, whereas, the lowest oil content was observed in flax treated with PB. The oil content and ratio of unsaturated fatty acids were higher in flax seedlings grown in greenhouse than in those grown in open field. The level of two endogenous bioactive gibberellins ($GA_1$ and $GA_4$) in flax seeds decreased with the application of PB and PC. The flax plants treated with PB and PC presented higher secoisolariciresinol diglucoside content than that of the control. The optimal concentration of PC was found to be 2000 ppm. In conclusion, the foliar application of 2000 ppm PC might be useful in increasing oil content and seed production in flax plants.

Influence of Re-growth Interval on Chemical Composition, Herbage Yield, Digestibility and Digestion Kinetics of Setaria sphacelata and Cenchrus ciliaris in Buffaloes

  • Mahr-un-Nisa, Mahr-un-Nisa;Khan, M. Ajmal;Sarwar, Muhammad;Mushtaque, M.;Murtaza, G.;Lee, W.S.;Kim, H.S.
    • Asian-Australasian Journal of Animal Sciences
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    • v.19 no.3
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    • pp.381-385
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    • 2006
  • This study examined the influence of re-growth periods on chemical composition, biomass production, nutritive value and digestion kinetics of Setaria sphacelata (SS) and Cenchrus ciliaris (CC) in ruminally cannulated buffalo bulls. Two re-growth intervals i.e. clipping every month ($CI_1$) and clipping after every two months ($CI_2$) were compared with the control (clipped after 4 months). Mean values of leaf to stem ratio in SS and CC grasses were decreased (p<0.05) with increasing re-growth interval. The lowest leaf to stem ratio was recorded in control plots of both grasses. In both grasses, increasing growth period increased the concentrations of dry matter (DM), neutral detergent fiber (NDF) and organic matter (OM) and decreased crude protein (CP). Mean dry herbage, OM and CP yields of SS and CC were increased (p<0.05) with increasing re-growth interval. Ruminal DM and NDF digestibilities of SS and CC were decreased (p<0.05) with increasing interval. Ruminal rate of DM and NDF disappearance was higher while the ruminal lag time of these nutrients was lower with monthly than with bi-monthly clipping interval. The results from present study imply that SS and CC clipped after every two months is more beneficial than when clipped every month or every four months in terms of optimal biomass with adequate nutritional value for buffaloes.

Investigation of a Left-Turn Phase Time Estimation Method for TRC Operation (실시간 신호시스템의 좌회전 신호시간 추정방법에 관한 연구 (검지기 장애발생시를 중심으로))

  • An, Hye-Jin;Nam, Baek;Lee, Sang-Su
    • Journal of Korean Society of Transportation
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    • v.25 no.5
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    • pp.33-42
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    • 2007
  • The current left-turn split model adopted in COSMOS has an inherent limitation when a loop detector in the left-turn lanes was disconnected for a period of time. In this instance, the current model always allocated minimum green time to the left-turn phase, thus optimal split and efficient signal operation for the intersection was not guaranteed. In this paper, four mathmatical models using detector information of the intersection and four empirical models using historical profiles were developed and investigated for different traffic conditions to improve the operational efficiency of the intersection. From the model evaluation test, the empirical model using a four-week historical profile produced the least error among the eight models investigated. NETSIM simulation test results also showed that the proposed model could give significantly reduced delay time as compared to the current model. From these results, the operational efficency of the signalized intersections under the real-time control can be greatly improved by using the model proposed in case of the left-turn detector failure.

Growth Characteristics of Soybean Sprouts Cultivated with Extract of Korean Herb Medicines (국산 한약재 추출물로 재배한 콩나물의 생육특성)

  • 최상도;김윤희;남상해;손미예
    • Food Science and Preservation
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    • v.9 no.2
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    • pp.168-173
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    • 2002
  • Growth characteristics and crude protein content of soybean sprouts cultivated with extracts of some Korean herb medicines for 4 days were investigated. Extracts of Korean herb medicines were utilized and adjusted to 100 ppm, 200 ppm, 300 ppm and 400 ppm as culturing water of soybean sprouts. Of Korean herb medicines tested, extract of Panax ginseng was most effective to increase of weight and length of soybean sprouts, followed by Glycyrrhiza glabra. Extracts of Angelica gigas and Cnidium officinale were similar with that of control group. Extract of Coptidis japonica inhibited the growth of soybean sprout. Optimal concentrations of extracts of Glycyrrhiza glabra and Panax ginseng for growth of soybean sprout were 100 ppm and 200 ppm, respectively. Weight of soybean sprout cultivated with extract of Panax ginseng (PGE) was increased to 7.2%(wet basis) as compared with that of control group. Length of soybean sprouts cultivated with 200 ppm of PGE was accelerated to 32% and increased to 50% in soybean sprout cultivated for 3 days. Crude protein contents of soybean sprout cultivated with extract of Angelica gigas or Panax ginseng was slightly increased according to cultivation period. In Cnidium officinale group, crude protein contents was increased at a 300∼400 ppm concentration and 4 days of cultivation.

Characteristics of fermented milk containing Bifidobacterium growth promoter (BE0623) and dietary fiber

  • Cho, Young Hoon;Sim, Jae Young;Nam, Myoung Soo
    • Korean Journal of Agricultural Science
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    • v.48 no.2
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    • pp.209-218
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    • 2021
  • This study was carried out to investigate the effects of Bifidobacteria growth promoter BE0623 and a dietary fiber supplement, which included Bifidobacterium lactis BB12, Lactobacillus acidophilus, Streptococcus thermophilus, and Bifidobacterium lactis. In fermented milk containing BE0623, the viable cell count of Bifidobacteria significantly increased by about 45 to 75 times compared to the control, and the titratable acidity increased, whereas the pH decreased. All fractions obtained by isolating BE0623 had Bifidobacteria growth effect. Acacia dietary fiber is a pale yellow powder. It has a viscosity of 60 to 100 cPs and a pH between 4.1 and 5.0. Its general components are less than 10% moisture, more than 90% dietary fiber, and less than 4% ash. The optimal addition ratio of Bifidobacteria growth promoting material was determined to be 0.05%. The general components of the manufactured fermented milk were carbohydrate 17.85%, protein 3.63%, fat 3.00%, and dietary fiber 2.95%. During storage of the fermented milk for 24 days, its titratable acidity, viscosity, and sugar content all met the criteria. In addition, the viable cell counts of Bifidobacteria and lactic acid bacteria in the fermented milk were 1.7 × 108 CFU·mL-1 and 1.5 × 107 CFU·mL-1, respectively, and Escherichia coli was negative. There was no significant difference between the control group and the treatment group in the sensory evaluation of sweet, sour, weight, and flavor, and the preference for the treatment group was excellent. The acceptability of the fermented milk of the treated group according to the storage period was excellent in terms of color, flavor, and appearance.

Optimization of MC903-induced Atopic Dermatitis Mouse Model : Focusing on Reducing the Induction Period and Adverse Effects (MC903으로 유도하는 아토피피부염 생쥐 동물 모델 최적화 : 유발 기간 단축 및 부작용 감소를 중심으로)

  • Soyeon Kim;Ji Hyo Lyu;Hyungwoo Kim
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.37 no.2
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    • pp.25-29
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    • 2023
  • This study was designed to establish an atopic dermatitis (AD) model using MC903 and was conducted to find out the optimal challenge concentration that can cause dermatitis symptoms enough to be experimentally verified while reducing adverse effects such as weight loss. MC903 was treated at concentrations of 2, 3, and 4 nmol/day, and evaluation of skin surface symptoms, water contents, histopathological changes, body weight changes, and spleen/body weight ratio was conducted. In addition, the expression level of thymic stromal lymphopoietin (TSLP) was also observed. In our results, MC903 induced AD skin lesions such as erythema, scab and fissure and lowered skin moisture level significantly. In addition, water holding capacities in the 3 or 4 nmol groups were diminished significantly compared to that in the control group. On the other hand, 4 nmol treatment induced a weight loss of up to 20% compared to control group. Finally, a higher level of TSLP expression was observed in the 3 nmol group than in the 2 nmol group or the 4 nmol group. Taken together, we propose a total 14-day protocol consisting of 3 days of sensitization (2 nmol/day) and 6 days of challenge (3 nmol/day).