This study was carried out to analyze the physico-chemical characteristics of the loin from pigs fed biotite. Control was fed diet for piglets and growing pigs, and treatments were fed diet supplemented 1.25% and 1.75% biotite to piglet diet and to growing pigs, respectively. Ratio of carcass grade A was shown as 27.8% and 50% in control group and treatment, respectively. And that of carcass grade A and B was appeared as 52.8% in control and 80% in treatment. The control group showed higher value of water and protein content than treatment. However, fat and ash content of treatment were higher than those of control. Treatment showed lower value than control in shear force and cooking loss, and was higher than control in pH value(p<0.05). L*, a* and b* value of control in meat color were lower than those of treatments. Treatments group was shown lower value than control group in textural gumminess and brittleness. In the sensory test of fresh meat, there was no significant difference between control and treatment group. However, intramuscular fat content and overall acceptability of control were more or less lower than its of treatment. In cooked meat, the meat color of control was lower than those of treatments. Control group was shown higher saturated fatty acid value than treatment group. However, the poly unsaturated fatty acid, essential fatty acid, and the ratio of unsaturated fatty acid/saturated fatty acid and essential fatty acid/saturated fatty acid were low.
For the study of method for salt elimination aimed at reforming tidal land into normal paddy fields in a short period with reduction of periods requiring for elimination of saline, CHP (a kind of Ca-hum ate), a soil conditioner made of peat as a main material was tried. In the pot experiment, effect on elimination of salt, improvement of physical-chemical characteristics and rice cultivation test were studied. The results of these tests are as follows: 1, CHP treatment somewhat improves aggregation state with some effect on aggregation. 2. CHP treatment is remarkably effective in permeability which increases with 1.0 percent treatment by three times in percolation rate, and by 4.5 times in volume of leached water respectively. 3. With the increase of CHP amounts, salt was eliminated in short period. When 80% of the total Na was leached in 1.0% CHP-A treated pot, control pot begins permeable. 4. CEC and phosphorous absorption capacity are not influenced by CHP treatment. 5. Growing state of rice is greatly influenced by rainfalls. Growth of rice in tidal land however are almost similar to those in normal paddy fields with layer amounts of CHP treatment. With salt content in the soils, saline hazard and numbers of ineffective stems, amounts of unmatured grain are increased. 6. With the treatment of CHP yields of rough rice were increased. With 0.5% CHP treatment the yields were similar to those of the normal paddy fields. With 1.0% CHP-A treatment, the yields were increased by 15 times more than those of none treated soil and by 25 percent more than normal paddy soils.
Kim Il-Suk;Jin Sang-Keun;Park Ki-Hoon;Kim Dong-Hoon;Hah Kyung-Hee;Park Seok-Tae;Kwuak Kyung-Rak;Park Jung-Kwon;Kang Yang-Su
Food Science of Animal Resources
/
v.26
no.2
/
pp.166-174
/
2006
To determine the proper processing and storage conditions, physico-chemical, microbial and sensory properties of venison jerky under different dry times were measured during storage at $30^{\circ}C$ for 28 days. Samples were dried for 3 hr (T1), 4 hr (T2) and 5 hr (T3) at $75^{\circ}C$ in the smoke chamber, respectively. The pH of T1 was slightly lower than those of T2 and T3 as storage time increased. As dry and storage time increased, TBARS of T2 and T3 were significantly higher (p<0.05) than that of T1. In meat color, $L^*$ values of T3 showed slightly higher than those of T1 and T2, while at values were not clearly tendency by the passage of storage time. $b^*$ values of T2 and T3 were higher than that of T1. The water activity were significantly lower (p<0.05) in ,the order of T3$log_{10}$ CFU/g until 28 days and its number were accepted by sensory evaluation. In conclusions, T2 and T3 showed slightly high overall acceptability and lipid oxidative stability compared to T1 conditions. These results indicated that longer dry time ($4{\sim}5 hr$) of venison jerky would be better characteristics as compared to shorter dry time (3 hr) with increased storage time at $30^{\circ}C$.
Objectives of this study was to determine the comparisons of physico-chemical characteristics in crossbred pigs(Korean native breed ${\times}$ Landrace breed) by feeding periods. A total of 150 pigs were sampled from commercial farm, and assigned into three treatedrnents. Feeding peirods of Tl, T2 and T3 were below 200 days, 220-220 days, over 220 days, respectively. Live weight, carcass weight and backfat thickness were significantly(P<0.05) increased with feeding period increased, and final grade score have significantly(P<0.05) lower when feeding period was increased. pH and water content were significantly(P<0.05) lower when feeding period was increased(over 220days). However, intramuscular fat have no significantly different among the treatments. $L^* and b^* were significantly(P<0.05) lower and a^*$ was significantly higher(P<0.05) when feeding period increased. Cooking loss was higher in the order of Tl > T3 > T2. Shear force values was significantly(P<0.05) decreased by feed period increase. In fatty acids, myristic acid, palmitic acid, stearic acid and saturated fatty acid(SFA) in T2 were significantly(P<0.05) lower in T2, whereas linolenic acid, unsaturated fatty acid(UFA), essential fatty acid(EFA), UFA/SFA and EFA/SFA were significantly higher in T2 compared with other treatment. However palmitoleic acid and arachidonic acid were no significantly different with feeding periods. As a result of this study, crossbred pigs was increased live weight and carcass weight with feeding periods. and improved meat color and tenderness with feeding periods. However, final grade score was decreased with feeding periods
Ha, Su Hyeon;Cha, Min Kyung;Kim, Kangjoo;Kim, Seok-Hwi;Kim, Yeongkyoo
Journal of the Mineralogical Society of Korea
/
v.30
no.4
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pp.149-159
/
2017
We investigated the mineralogical and chemical characteristics of oyster shell as the possible substitute for the limestone used as an absorbent of $SO_2$ gas. The oyster shells from Taean and Tongyeong were used for the comparison with limestone and those from Boyreong and Yeosu were additionally investigated. XRD results show that all shells are composed of calcite with the exception of the myostracum layer attached to adductor muscle and ligament, which is composed of aragonite. The marine sediments as impurities exist on the surface of shells or as inclusions in the shells. Calcite is the main mineral composition of the shell of barnacle which is also one of the impurities. The oyster shell is composed of three main layers; prismatic, foliated, and chalk. The oyster shell from Tongyeong with the largest shell size, has the smallest thickness of prismatic and foliated layers which contain protein called conchiolin, whereas that from Taean with the smallest shell size has the largest prismatic and foliated layers. The sizes of those two layers of the shells from Boryeong and Yeosu are larger than that from Tongyeong but smaller than Taean. Those differences are supposed to be due to the different growth environments because the oysters from Tongyeong are cultured under the sea while those from Taean are in the tidal zone. The oyster shells generally show higher amount of sulfur and phosphorus than limestone, mainly due to the composition of protein. Some elements such as Mg show significant variations in different layers. As for trace elements, Li shows much higher amount in oyster shells than limestone, suggesting the influence of the composition of the sea water on the formation of the oyster shells.
This survey has been conducted to obtain basic data of the quality of ground water for hydroponics and waste nutrient solution after hydroponics in hydroponic farms in Chungbuk area. Ground water samples were collected and analyzed at 19 sites of hydroponic farms. Waste nutrient solution samples were analyzed at 15 sites selected of them. The values of several components in ground water for hydroponics were as follows. pH range was shown from 6.2 to 7.7 and the average was 6.8. EC range was shown from 0.10 to 0.45 dS $m^{-1}$ and the average 0.23 dS $m^{-1}$. $NO_3-N$ concentrations was ranged from 0.12 to 13.77 mg $L^{-1}$, $SO_4^{2-}$ concentrations was ranged from 1.84 to 63.01 mg $L^{-1}$ and $Cl^-$ concentrations were ranged from 10.46 to 72.09 mg $L^{-1}$. Average values of $NO_3-N$, $SO_4^{2-}$ and $Cl^-$ were 4.00 mg $L^{-1}$, 12.70 mg $L^{-1}$ and 27.57 mg $L^{-1}$, respectively. $Ca^{2+}$, $Mg^{2+}$ and $Na^+$ concentrations were ranged from 3.24 to 36.99 mg $L^{-1}$, 1.44 to 14.93 mg $L^{-1}$ and 6.12 to 25.25 mg $L^{-1}$, respectively. Average concentrations were 13.06 mg $L^{-1}$ in $Ca^{2+}$, 6.02 mg $L^{-1}$$Mg^{2+}$ and 12.08 mg $L^{-1}$ in $Na^+$. In waste nutrient solution after hydroponics, pH range was shown from 4.3 to 8.8 and the average was 6.7. EC range was shown from 0.44 to 2.37 dS $m^{-1}$ and the average 1.15 dS $m^{-1}$. Range of $NO_3-N$, $PO_4-P$, $K^+$, $Ca^{2+}$, $Mg^{2+}$ and $Na^+$ in waste nutrient solution were $10{\sim}212$, $0.56{\sim}26.1$, $10{\sim}295$, $16{\sim}215$, $9{\sim}54$ and $10{\sim}53$ mg $L^{-1}$ respectively. Average concentration were 100 mg $L^{-1}$ in $NO_3-N$, 12.15 mg $L^{-1}$ in $PO_4-P$, 99 mg $L^{-1}$ in $K^+$, 78 mg $L^{-1}$ in $Ca^{2+}$, 26 mg $L^{-1}$ in $Mg^{2+}$ and 26 mg $L^{-1}$ in $Na^+$. Inorganic matters in waste nutrient solution after hydroponics was higher than that of ground water for hydroponics.
Considering the ways for the possible improvement of soil test for upland crops, various methods for the evaluation of K supplying power and testing of available soil K were reviewed in terms of theoretical principles and practical usefulness of the each method. The review was also made on the characteristics of upland crops in K requirement and on the chemical properties of major korean upland and lowland rice soils in terms of K availability. Following is the few remarks drawn from the review. 1. Quite large number of methods have been known for the evaluation of K supplying power and testing for available soil K. In nature, they can be divided into two categories; capacity-based methods and intensity-based methcds. The capacity-based methods usually measure the exchangeable and some portion of nonexchangeable K, while the intensity-based methods suggest to consider the ractivity ratios of major cations in soil solution and the energy requirement for the replacement of exchangeable soil K into soil solution. 2. As methodology for extraction of interested part of soil K, chemical extraction, electrodialysis and ion exchange methods have been known. Among these, chemical extract ion is favorable because of its simplicity. However, recently suggested Electro-Ultra-Filtration method seems to merit further study for wider use for not only K but also other nutrient availability of soils. 3. The intensity-based methods, although they are more theoretical, because of their complexity, in methods may not be adapted for practical soil tests. 4. The exchangeable K which is rather simple to measure and which well reflects the status of K reserve as nonexchangeable and is immediate pool of water soluble K may be good, if not best, criterion of soil K availability to plant in common soil testing. 5. Because there are evidences that the abundance of available K alone may not be good inclication for availability of K to plant, it is recommendable to interprete the exchangeable K data as percent saturation of exchangeable K to total C. E. C. of soil for the recommend ation of K fertilizer based on soil tests. 6. Some pot and field trial results showed the trends that percent potassium saturation to total C. E. C. better serve as the parameter for K fertilizer recommendation.
Groundwaters in granite, gneiss, and two-mica granite formations, including faults, in the Hoengseong area are examined to determine the relationship between their uranium and radon-222 contents and rock types. The chemical compositions of 38 groundwater samples and four surface water samples collected in the study area were analyzed. Sixteen of the samples showing high uranium and radon-222 contents were repeatedly analyzed. Surface radioactivities were measured at 30 points. The uranium and radon-222 concentrations in the groundwater samples were in the ranges of 0.02-49.3 μg/L and 20-906 Bq/L, respectively. Four samples for uranium and 35 samples for radon had concentrations exceeding the alternative maximum contaminant level of the US EPA. The chemical compositions of groundwaters indicated Ca(Na)-HCO3 and Ca(Na)-NO3(HCO3+Cl) types. The pH values ranged from 5.71 to 8.66. High uranium and radon-222 contents in the groundwaters occurred mainly at the boundary between granite and gneiss, and in the granite area. The occurrence of uranium did not show any distinct relationship to that of radon-222. The radon-222, an inert gas, appeared to be dissolved in the groundwater of the aquifer after wide diffusion along rock fractures, having been derived from the decay of uranium in underground rocks. The results in this study indicate that groundwater of neutral or weakly alkaline pH, under oxidizing conditions and with a high bicarbonate content is favorable for the dissolution of uranium and uranium complexes such as uranyl or uranyl-carbonate.
Roofing tile research conducted in Korea so far is mostly related to studies on roofing tile patterns excavation report on the roof tile klin site in the aspects of archeology architecture and history of art. There have been continuous studies on kiln ground and manufacture techniques of roofing tiles. However it is difficult to find roofing tiles research based on scientific experiments. The research on this paper performs physical and chemical experimental study to understand order, manufacturing techniques and other characteristics of Chosun Dynasty roofing tiles excavated in Dongdaemun stadium. As for physical experimental study water absorption, specific gravity, whole-rock Magnetic susceptibility rate and Differential Thermal Analysis are conducted. As for chemical experimental study, neutron activation analysis(NAA), microstructure observation, X-ray diffractometry(XRD) analysis are conducted. Result of neutron activation analysis and statistical analysis on piece of roof tile 22 samples clearly show that the roofing tile samples are from different time line and places. It also shows different composition when compare average value of rare earth resources per findspots. It means roofing tiles were manufactured from clay mineral from several places. Close inspection using XRD and polarization microscope reveals that main components of roofing tiles are quartz and felspar. Mica and Illite are found partially. XRD analysis shows mullite mineral composition which occurs when roofing tile is calcined around $1000^{\circ}C$. Differential thermal analysis shows gradual exothermic peak near $900^{\circ}C$. Based on these results, it is assumed that roofing tile is made at $900{\sim}1000^{\circ}C$. result of XRD analysis shows mullite were made near $1000^{\circ}C$. in Differential Thermal Analysis shows gradual exothermic peak near $900^{\circ}C$. this results shows that roof tiles were made near 900~1000 near $1000^{\circ}C$ mean value of whole-rock Magnetic susceptibility rate. When performed comparative analysis using whole-rock Magnetic susceptibility rate average value, findspots provided no certain classification to arrange. Nonetheless low whole-rock Magnetic susceptibility rate 0.2~0.78(${\times}103$ SI unit) is found when roofing tile patterns are Pasangmun, Taesangmun, Eosangmun, Kyukjamun, Heongsunmun. Overall absorptivity is 14~21%. It is similar to 14~18% of roofing tile from Chosun Dynasty. There is only 1.4~2.5g/cm3 of roof tile sample specific gravity. The analysis finds no difference in specific gravity by findspots.
This study was conducted to examine the morphological, physical and chemical characteristics of the Bancheon, Gopyeong, Hwadong and Deogpyeong series derived from diluvium in Korea. The results were as follows. 1. The sequence of the Bancheon, Gopyeong, Hwadong and Deogpyeong series consists of the soil catena. Thus, the Bancheon and Gopyeong series are weil drained, the Hwadong and Deogpyeong series moderately well drained due to the influence of topography and irrigation water. 2. The surface soils of the Bancheon and Gopyeong series are yellowish red, dark yellowish brown fine silty texture and the subsoils are yellowish red, red and strong brown fine clayey with moderate to strong angular blocky or subangular blocky structure with clayey cutans on the structural face. The surface soils of the Hwadong and Deogpyeong series are dark grayish brown, grayish brown fine silty texture and the subsoils are strong brown, light olive brown and brownish yellow fine silty or fine clayey with moderate to strong prismatic, angular blocky or subangular blocky structure with clayey cutans on the structural face. The consistences of all the subsoil horizons are extremely compact and hard, whereas sticky and plastic when wet. 3. The lower the topography, the higher the silt/clay ratio, soil reaction, organic matter, available water and phosphate content but the higher the topography, the higher the active iron content. 4. These soils are classified as Hapludalfs by Soil Taxonomy in U.S.D.A. 5. These soils must be applied with much lime, phosphate and compost to improve the soil fertility.
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