• 한국자원식물학회지
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• 제29권3호
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• pp.339-346
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• 2016

This study was carried out to develop an effective seed propagation method for Thalictrum rochebrunianum var. grandisepalum (H. Lev.) Nakai by analyzing seed dormancy types and germination characteristics. Seeds were collected between September to October at Gangwon province, and well-selected seeds were used while being dry-stored at 4±1℃. The seed size ranged 4.52 × 1.58 ㎜ and the weight of thousand seeds were 1,603.5 ± 0.02 ㎎. The moisture content was 7.2%. Seeds were achene type, and morphology characters showed an elliptical shape and rough texture, and light brown in color. Moist-chilling treatment was conducted for dormancy breaking because the seeds had an undeveloped embryo of liner type. The embryo had developed during a moist-chilling period, constantly, and fully developed in 10 weeks. Consequently, it seemed to be non-deep complex or intermediate complex type of morphophysiological dormancy, and embryo dormancy was broken by wet-chilling for 10 weeks. After 10 weeks of wet-chilling treatment, seed germination began. Germination percentage was higher in dark condition raher than light condition and recorded the maximum at 25℃ in the dark (16.3%). A pre-soaking treatment with a combined plant growth hormones promoted germination and shortened T₅₀. Specifically, seed germination of 84.5% was achieved by pre-soaking of seeds with a combined solution of 500 ㎎/L GA₃ and 10 ㎎/L kinetin for 24 h after a wet-chilling treatment for 10 weeks. Thus the effect of plant growth hormones coupled with chilling temperature on seed breaking dormancy provide asubsequent growth of seedlings for successful plantation.

• 보존과학회지
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• 제27권1호
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• pp.91-100
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• 2011

본 연구에서는 열화된 소나무류를 대상으로 PEG 처리 후 조습건조시 적정 PEG농도, 습도 및 시간을 조사하고자 하였고, 조습건조과정 중 치수안정화 효과를 진공동결건조 및 자연건조한 것과 비교하였다. 조습건조에서 PEG의 농도가 높을수록 건조시간이 단축되었으며 치수안정성이 우수하였다. 저농도(40%, 50%) PEG 함침 후 조습건조는 치수안정화 효과가 적었고 목재표면 및 내부에 갈라짐이 발생하였으며 PEG의 분포가 불균일하였다. 고농도(60%, 70%) PEG 함침 후 조습건조를 하였을 때 목재의 표면은 흑화현상으로 인해 색은 어두워졌으나, 저농도(40%) PEG 함침 후 진공동결건조한 것과 비교하여 거의 동일한 치수안정화 효과를 나타내었다. 따라서 대형발굴수침고목재의 보존처리시 진공동결건조가 불가능할 경우 고농도 PEG(70%) 함침 후 조습건조하는 방법이 가능하고, 이때 건조습도와 건조시간을 충분히 고려해서 건조해야 함을 알 수 있었다.

• 한국식품영양과학회지
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• 제23권1호
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• pp.164-169
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• 1994

해조묵제조 과정에서 묵중 $Ca^{++}$함량 및 조직학적 변화를 조사하였다. 겔화한 동안 미역이 다사마 보다 $Ca^{++}$함량증가가 빠르면, 겔형성 후 수침시 유출되는 $Ca^{++}$량도 미역이 다시마 보다 많았다. 알칼리용해 및 여과는 묵 수침시 $Ca^{++}$유출량을 감소시켰다. 미역은 불규칙하고 긴 세포벽을, 다시마는 비교적 규칙적인 세포벽으로 이루어져 있으며, 알긴산은 세포벽 주위에 주로 존재하였다. 가열, 알칼리 용해 및 묵제조에 딸 알긴산은 점차적으로 용해되었으나 사상세포는 다시마인 경우 미세하게 절단되었으나 미역인 경우는 상당부분 묵 중에 잔존하였다.

• 한국식품영양과학회지
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• 제24권6호
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• pp.1010-1015
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• 1995

Extent of reduction in protein digestibility by Godulbaegi(lxeris sonchifolia H.) kimchi powder appeared to be related to the kimchi weight-to-protein weight ratio, the kind of protein sources, part of plants and fementation period. In vitro digestibilities of protein were significantly(p<0.05) reduced as the freeze dried kimchi powder weight-to-protein ration increased from 0.5 : 1.0 to 1.0 : 1.0 for all Godulbaegi samples and protein sources. Overall digestibility of protein sources in the presence of kimchi powder, the reduction ranked in the following order : soybean>casein>beef>squid. Lower(p<0.005) reduction occurred for each protein source when raw plant was exchanged for kimchi products. Some greater reduction of digestibility was noted in young plants and leaf samples than ripe or root samples. Trypsin inhibitor, which expressed as soybena trypsin inhibitor, was inversely related(r=0.8437) to in vitro protein digestibility of casein in the presence of Godulbaegi kimchi powder. More than three times of total polyphenols contained in leaves than in roots. Young leaves had 30% more total polyphenols(37.64mg/g sample) than that in ripe ones. Soaking in 5% NaCl solution for 24 hrs was markedly reduced in total polyphenols as 73% for leaves and 33% for roots. Remarkable reduction in total polyphenols was not checked during fermentation followed after soaking. Trypsin inhibitor content correlated well(r=0.8873) with total polyphenols in all of Godulbaegi samples.

• 산업식품공학
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• 제13권1호
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• pp.24-31
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• 2009

The structural and physicochemical properties of dried aloe vera gel by DIS (dewatering impregnation soaking) process under optimum conditions were investigated. FT-IR spectra for dried samples of DIS aloes showed the typical patterns of standard aloe polysaccharide, and surface structures by SEM (scanning electron microscopy) were similar to a gel-like structure. In case of physicochemical properties of dried aloe samples by DIS process, solubilities and swelling powers of control (not osmotic treated aloe), DIS (S) and DIS (G), samples treated by osmotic solution of 60% sucrose/0.25% NaCl and 50% glucose/0.5% NaCl, were 48.3-57.3% and 8.3-11.7%, respectively, showing no significant differences among samples, but swelling power of DIS (PEG), sample treated by using 50% polyethylene glycol as an osmotic agent was about 5 times higher that of control. Also, water holding capacities of control, DIS (S) and DIS (G) were similar to each other, but that of DIS (PEG) was about 5 times higher that of control. Oil holding capacities of control and DIS aloes maintained the 50.9-86.4% levels of water holding capacities showing no significant differences among samples. Rehydration ratio of DIS (PEG) aloes were significantly dependent on the temperature of rehydrated solvent (water), and rehydration ratio of not-fileted aloe was about two folds higher than that of fileted aloe.

• 한국식품영양과학회지
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• 제23권4호
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• pp.625-633
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• 1994

In this study, processing of dried products of adcidian , Haocynthia roretzi, were investigated, which has been cultured in the south and east coast of Korea in recent years. Raw ascidians were shucked , gutted, soaked and then drained. Seven kinds of dried ascidian meats were prepared : boiled in 5% slat solution for 10 min and hot-air dried (A)-sun dried (B) or hot-air dried (C) after soaking for 1 min in 0.2% NaHSO3 solution , sun dried (D) or hot -air dried (G) after treating for 15 sec in 5% liquid smoke solution, and sun dried (E) or hot -air dried (F) after blanching for 30 sec in boiling 5% salt solution added with 0.2% NaHSO3. The moisture contents, water activity of the products showed little change and VBN gradually increased during storage at 25 $\pm$2$^{\circ}C$. The TBA and POV values of the liquid smoked dried ascidian (product D, G0 were considerably lower than those of others, In fatty acid composition 22 : 6 , 20 : 5 : 16: 0 and 18 : 1 acid were predominant. Conditions adopted in products D and G had a good antioxidative effect on highly unsatuated fatty acids during the storage. The contents of inosine and AMP of products were higher than those of other nucleotide and their related compounds. Judging from the results of chemical experiments and sensory evaluation, the sample A, D and G were most desirable and they could be preserved more than 120 days at room temperature(25$\pm$2$^{\circ}C$).

• Journal of the Korean Wood Science and Technology
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• 제50권2호
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• pp.93-103
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• 2022

Currently, biofibers are used as a reinforcement in polymer composites for structural elements and construction materials instead of the synthetic fibers which cause environmental problems and are expensive. One of the chemicals with a pH close to neutral that can be potentially used as a modified fiber material is sodium chloride (NaCl). Therefore, this study aims to investigate the characteristics of a composite board made from NaCl-treated kenaf fiber. A completely randomized design method was used with consideration of two factors: the content of NaCl in the treatment solution (1 wt%, 3 wt%, and 5 wt%) and the duration of immersion of fibers in the solution (1 h, 2 h, and 3 h). The NaCl treatment was conducted by soaking the fibers in the solution for different durations. The fibers were then rinsed with water until the pH of the water reached 7 and subsequently dried inside an oven at 80℃ for 6 h. Kenaf fiber and epoxy were mixed manually with the total loading of 20 wt% based on the dry weight of the fiber. Physical and mechanical properties of the fibers were then evaluated based on JIS A 5908 particleboard standards. The results showed that increasing NaCl content in the fiber treatment solution can increase the physical and mechanical properties of the composite board. The properties of fibers treated with 5 wt% NaCl for 3 h were superior with a modulus of elasticity of 2.085 GPa, modulus of rupture of 19.77 MPa, internal bonding of 1.8 MPa, thickness swelling of 3%, and water absorption of 10.9%. The contact angle of untreated kenaf fibers was 104°, which increased to 80° and 73° on treatment with 1 wt% and 5 wt% NaCl for 3 h, respectively.

• 한국환경복원기술학회지
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• 제10권1호
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• pp.9-15
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• 2007

The study was conducted to find out the harvesting time, storage duration, cold treatment and sterilization on seed germination of Miscanthus sinensis. The optimum harvesting time of the Miscanthus seed in native to Jeju island was December. And the seed germination passible 3 years after harvesting. When the seeds had cold treatment, seed germination nate was 74% rather than 63% of non-treatment. For seed sterilization treatment, soaking in solution of Benomyl 7% during from 3 hours to 12 hours germinated 9% over. But the non-treatment on 24 hours treatment reduced the seed germination of Miscanthus sinensis.

• 한국작물학회지
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• 제13권
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• pp.73-76
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• 1973

Protein spectra from 6 species of Gossypium were obtained by disc electraphoresis of seed extracts. Protein extracts were made by soaking 0.5g. of seed in 15ml of Tris-glycine buffer for 24 hours. Gels 24 hours. Gels were stained in 0.5% Amido Black solution for 1 hour, and destained in 7% acetic acid for 72 hours. Nine to 15 bands were visible in each gel. Homologies of Protein bands among the species were determined by migration velocity. Evidences obtained from electrophoretic separation of seed Protein were consistent with those from genetic, cytological, morphological and Phenogenetic methods regarding the origin of New World cultivated cottons. Possibility, however, does not exist to exclude Gossypium herbaceum from one of the Progenitors of New World cultivated cottons from electrophoretic evidences alone.

• 한국세라믹학회지
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• 제21권4호
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• pp.341-348
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• 1984

$BaTiO_3$ and $SrTiO_3$ were mixed with the mole ratio of 35:65， 50:50 and 65:35 and heated at 1100~120$0^{\circ}C$ for 1~64 hours. The dielectrics of $BaTiO_3$-$SrTiO_3$ system were investigated as a function of amount of solid solution formed. The dielectric constant was increased and Curie temperature was shifted to higher temperature with increasing of heating of soaking time for the same composition and heating temperature. This can be explained by the homogeneous distribution of $Ba^{2+}$ and $Sr^{2+}$ ion in the $BaTiO_3$ system. The Curie temperature was shifted to lower temperature with increasing $SrTiO_3$ in the $BaTiO_3$-$SrTiO_3$system because of decreasing the lattice constant.