Effects of ammonia and nitrite on survival, growth and moulting in juvenile tiger crab, Orithyia sinica (Linnaeus)   总被引：3，自引：0，他引：3  

Ja-Geun Koo  Seong-Gil Kim  Jung-Hoon Jee  Jong-Man Kim  Sungchul C Bai  & Ju-Chan Kang 《Aquaculture Research》2005,36(1):79-85

The effects of ammonia and nitrite on survival, growth and moulting were investigated in juvenile tiger crab, Orithyia sinica (carapace length 3.91±0.15 mm, carapace width 3.84±0.23 mm, n=440), after 30 days exposure to ammonia‐N (0, 20, 50, 100 and 150 mg L^?1) and nitrite‐N (0, 50, 100, 150, 200 and 250 mg L^?1) using a continuous flow system. Survival rates of tiger crab exposed to ammonia and nitrite decreased linearly with the exposure time and concentration. The growth rate of tiger crab exposed to 50, 100 and 150 mg L^?1 ammonia was significantly lower than that of control crabs. The growth rate of tiger crab exposed to nitrite decreased at 150, 200 and 250 mg L^?1 nitrite. During the ammonia and nitrite exposure, the intermoult period of the juveniles of tiger crab O. sinica was shortened between the first and second moult, and the number of moulting of crabs exposed to a higher concentration were significantly higher than that of control crabs.  相似文献   

Patient-specific embryonic stem cells derived from human SCNT blastocysts     

Hwang WS  Roh SI  Lee BC  Kang SK  Kwon DK  Kim S  Kim SJ  Park SW  Kwon HS  Lee CK  Lee JB  Kim JM  Ahn C  Paek SH  Chang SS  Koo JJ  Yoon HS  Hwang JH  Hwang YY  Park YS  Oh SK  Kim HS  Park JH  Moon SY  Schatten G 《Science (New York, N.Y.)》2005,308(5729):1777-1783

Patient-specific, immune-matched human embryonic stem cells (hESCs) are anticipated to be of great biomedical importance for studies of disease and development and to advance clinical deliberations regarding stem cell transplantation. Eleven hESC lines were established by somatic cell nuclear transfer (SCNT) of skin cells from patients with disease or injury into donated oocytes. These lines, nuclear transfer (NT)-hESCs, grown on human feeders from the same NT donor or from genetically unrelated individuals, were established at high rates, regardless of NT donor sex or age. NT-hESCs were pluripotent, chromosomally normal, and matched the NT patient's DNA. The major histocompatibility complex identity of each NT-hESC when compared to the patient's own showed immunological compatibility, which is important for eventual transplantation. With the generation of these NT-hESCs, evaluations of genetic and epigenetic stability can be made. Additional work remains to be done regarding the development of reliable directed differentiation and the elimination of remaining animal components. Before clinical use of these cells can occur, preclinical evidence is required to prove that transplantation of differentiated NT-hESCs can be safe, effective, and tolerated.  相似文献   

Energy content of intact and heat-treated dry extruded-expelled soybean meal fed to growing pigs     

Bonjin Koo  Olumide Adeshakin  Charles Martin Nyachoti 《Journal of animal science》2021,99(7)

An experiment was performed to evaluate the energy content of extruded-expelled soybean meal (EESBM) and the effects of heat treatment on energy utilization in growing pigs. Eighteen growing barrows (18.03 ± 0.61 kg initial body weight) were individually housed in metabolism crates and randomly allotted to one of three dietary treatments (six replicates per treatment). The three experimental diets were the following: a corn-soybean meal-based basal diet and two test diets with simple substitution of a basal diet with intact EESBM or heat-treated EESBM (heat-EESBM) at a 7:3 ratio. Intact EESBM was autoclaved at 121 °C for 60 min to make heat-treated EESBM. Pigs were fed the experimental diets for 16 d, including 10 d for adaptation and 6 d for total collection of feces and urine. Pigs were then moved into indirect calorimetry chambers to determine 24-h heat production and 12-h fasting heat production. The energy content of EESBM was calculated using the difference method. Data were analyzed using the Mixed procedure of SAS with the individual pig as the experimental unit. Pigs fed heat-EESBM diets showed lower (P < 0.05) apparent total tract digestibility of dry matter (DM), gross energy, and nitrogen than those fed intact EESBM. A trend (P ≤ 0.10) was observed for greater heat increments in pigs fed intact EESBM than those fed heat-EESBM. This resulted in intact EESBM having greater (P < 0.05) digestible energy (DE) and metabolizable energy (ME) contents than heat-EESBM. However, no difference was observed in net energy (NE) contents between intact EESBM and heat-EESBM, showing a tendency (P ≤ 0.10) toward an increase in NE/ME efficiency in heat-EESBM, but comparable NE contents between intact and heat-EESBM. In conclusion, respective values of DE, ME, and NE are 4,591 kcal/kg, 4,099 kcal/kg, and 3,189 kcal/kg in intact EESBM on a DM basis. It is recommended to use NE values of feedstuffs that are exposed to heat for accurate diet formulation.  相似文献   

Correlation of yarn tension with parameters in the knitting process     

Young Seok Koo 《Fibers and Polymers》2002,3(2):80-84

Tension control is an important factor in producing high quality knitted products and in maintaining good processing condition. Yarn tension during knitting is subject to be affected from many elements of the machine and process parameters. Several factors including yarn feeding speed, feeding angle, and needle gauge that are considered to influence on the tension variation were investigated. Yarn feeding speed did not show high contribution to the tension variation but feeding angle of yarn did show high correlation with the tension. No or negative correlation of the tension with needle gauge was found from the results. In order to keep well-determined process condition in the knitting manufacturing, it is strongly suggested that all knitting elements and parameters should be in the integrated control circumstance.  相似文献   

Slowly Digestible Starch from Debranched Waxy Sorghum Starch: Preparation and Properties     

Sang Ick Shin  Hea Jin Choi  Koo Min Chung  Bruce R. Hamaker  Kwan Hwa Park  Tae Wha Moon 《Cereal Chemistry》2004,81(3):404-408

Effects of debranching time, storage time, and storage temperature on production and structural properties of slowly digestible starch (SDS) were investigated. Waxy sorghum starch was hydrolyzed by isoamylase for various times (0–24 hr), and the variously debranched products were stored at ‐30, 1, and 30°C for 1–6 days. Optimal conditions for SDS production were isoamylase treatment for 8 hr and storage at 1°C for three days, resulting in SDS content of 27.0% in the optimum product. Microscopic observation revealed that rapidly digestible starch (RDS) and SDS were removed from the edges and surfaces of the optimum product by α‐amylase digestion. Digestion conditions that removed RDS and SDS resulted in a residue with a higher transition temperature and enthalpy than raw starch on a differential scanning calorimetric thermogram. Removal of RDS alone did not cause distinct decrements of peak temperature (T_p) and enthalpy (ΔH) compared with stored starch. The optimum SDS product showed an amorphous type of X‐ray diffractogram. Digestive removal of RDS from the optimum product gave a residue with X‐ray peaks similar to B type, which supports that it is partly crystalline. Removal of RDS and SDS gave broader peaks in the X‐ray pattern.  相似文献   

Body Shape and Growth in Reciprocal Crosses of Wild and Farmed Olive Flounder,Paralichthys olivaceus     

Jong‐Hyun Kim  Jeong‐Ho Lee  Hyun Chul Kim  Jae Koo Noh  Jung‐Ha Kang  Kyung‐Kil Kim 《Journal of the World Aquaculture Society》2011,42(2):268-274

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Methiozolin [5‐(2,6‐difluorobenzyl)oxymethyl‐5‐methyl‐3,3(3‐methylthiophen‐2‐yl)‐1,2‐isoxazoline], a new annual bluegrass (Poa annua L.) herbicide for turfgrasses     

Suk‐Jin Koo  Ki‐Hwan Hwang  Man‐Seok Jeon  Sung‐Hun Kim  Jongsoo Lim  Dong‐Guk Lee  Nam‐Gyu Cho 《Pest management science》2014,70(1):156-162

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Extrachromosomal DNA-mediated glyphosate resistance in Italian ryegrass     

Dal-Hoe Koo  Yoonha Ju  Karthik Putta  Rajendran Sathishraj  Nilda Roma-Burgos  Mithila Jugulam  Bernd Friebe  Bikram S. Gill 《Pest management science》2023,79(11):4290-4294

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Physicochemical Properties of Sonicated Mung Bean,Potato, and Rice Starches     

Koo Min Chung  Tae Wha Moon  Hyunjung Kim  Jae Kun Chun 《Cereal Chemistry》2002,79(5):631-633

Mung bean, potato, and rice starch solutions (5%, w/w) were sonicated for up to 5 min after heating, and their physicochemical properties were investigated. Alkaline viscosities, including the apparent and inherent viscosities of starches, decreased. The residues of the swollen starch granules after pasting and centrifugation were also reduced prominently by sonication. Average degree of polymerization did not change with sonication. The starch paste became more transparent, and the hot paste viscosity measured at 70°C decreased remarkably. Results indicate that changes in the physicochemical properties of starch were induced by the disruption of swollen granules rather than the breakage of glucosidic linkages with sonication.  相似文献