• 식물분류학회지
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• 제39권4호
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• pp.247-253
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• 2009

한국산 쑥속 20분류군의 분류를 위하여 체세포 염색체수를 조사하였다. 본 연구에서 취급된 분류군들의 체세포 염색체수는 2n = 16, 18, 34, 36, 50, 52, 54로서 기본 염색체수는 x=8, 9, 10, 13, 17이었으며, 실제비쑥(A. japonica var. angustissima 2n = 36)의 체세포염색체수는 본 연구에서 처음으로 밝혀졌다. 사철쑥 (A. capillaris 2n = 18), 섬쑥(A. japonica var. hallaisanensis 2n = 36), 갯제비쑥(A. japonica subsp. littoricola 2n = 36), 개똥쑥(A. annua 2n = 18), 개사철쑥(A. carvifolia 2n = 18), 큰비쑥(A. fukudo 2n = 16), 맑은대쑥(A. keiskeana 2n = 18), 넓은잎외잎쑥(A. stolonifera 2n = 36), 그늘쑥(A. sylvatica 2n = 16), 물쑥(A. selengensis 2n = 36), 산쑥 (A. montana 2n = 52), 뺑쑥(A. lancea 2n = 16), 산흰쑥(A. sieversiana 2n = 18) 등의 13분류군의 염색체수는 기존 보고와 일치하였으며, 기존 보고와 다르게 파악된 종류는 제비쑥(A. japonica var. japonica 2n = 18, 36 vs 2n = 36), 더위지기(A. sacrorum 2n = 18, 54 vs 2n = 54), 덤불쑥(A. rubripes 2n = 16, 34 vs 2n = 16), 쑥(A. indica 2n = 34, 36 vs 2n = 34), 참쑥(A. codonocephala 2n = 18, 50, 54 vs 2n = 50), 황해쑥(A. argyi 2n = 34, 36, 50 vs 2n = 34)의 6분류군이었다. 한국산 쑥속의 체세포 염색체수는 제비쑥, 더위지기, 참쑥, 황해쑥, 산쑥, 그늘쑥의 분류에 매우 유용한 형질이었다.

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 1998년도 Proceedings of UNESCO-internetwork Cooperative Regional Seminar and Workshop on Bioassay Guided Isolation of Bioactive Substances from Natural Products and Microbial Products
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• pp.187-187
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• 1998

The objective was to verify biological activities of fruit and stem of prickly pear(Opuntia ficus indica L. var, saboten Makino). We have determined inhibitory activities on enzymes, such as dopamine ${\beta}$-hydroxylase(DBH), monoamme oxidase A and B(MAO-A, B), and antioxidant activity, in vitro. We purchased dried stem powder and lyophilized fruit powder of prickly pear from CheJu Island, and prepared the extracts with 80% of methanol. The fruit extract showed stronger inhibitory effects on MAO-A and -B and antioxidant activity compared. to the stem extract, on fractionation with hexane, ethyl acetate, butanol and water. Both the stem and the fruit extracts with ethyl acetate showed stronger enzyme inhibitory and antioxidant activities than other extracts. Now we are isolating active principles from both ethyl acetate extracts.

• Plant Resources
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• 제7권1호
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• pp.15-21
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• 2004

This study was conducted to evaluate the effect of mecoprop-wp concentrations on weed control, growth characters and yield in flax, after 7cm and 14cm of plant height it to the field. The major weeds were Alopecurus aequalis var. a murensis (kom) ohwi, Persicaria hydropiper spach, Lamium amplexicaule L, Stellaria alsine Grimm var. undulata ohwi, Eleusine indica(L.) Gaertn. Flax yield were increased somewhat more with 250g/10a mecoprop-wp at 7cm of plant height than the other treatment and by hand weeding treatment of mecoprop-wp, 250g/10a at 7cm of plant height was slightly harmful for the flax with recommended concentration, On the other hand, all treatments were harmful in the double dosage level.

• Mycobiology
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• 제50권3호
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• pp.155-165
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• 2022

Penicillium vietnamense sp. nov. was isolated from Nha Trang Bay, Vietnam in June 2017. It is phylogenetically distinct from the sister species of Penicillium section Charlesia series Indica based on multi-locus sequence typing results using internal transcribed spacer, large subunit ribosomal RNA, b-tubulin, calmodulin, and RNA polymerase II second largest subunit regions. It showed strong growth on Czapek yeast autolysate agar at 37 ℃, a strong acid production on Creatine sucrose agar, and produced short stipes, small vesicles, and subglobose to globose conidia delicately roughened with very short ridges. As the first novel marine fungi species described from Vietnam and discovered in a unique environment, the data could be significant for understanding the taxonomy and geographical distribution of marine fungi in tropical coastal systems such as Vietnam.

• Biotechnology and Bioprocess Engineering:BBE
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• 제7권4호
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• pp.185-193
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• 2002

With Increasing awareness towards environment-friendly and non-toxic pesticide azadirachtin obtained from neon tree (Azadirachta indica) is gaining more and more importance. Its broad-spectrum activity, Peculiar mode of action. eco-friendly and non-toxic action towards beneficial organisms has offered many advantages over chemical pesticides. All currently use commercial formulations based on azadirachtin contains azadirachtin extracted from seeds of naturally grown whole plants which is labour intensive process depending upon many uncontrollable geographical and climatic factors. Plant tissue culture can be a potential process for the pro-duction, offering consistent, stable and controlled supply of this bioactive compound, However the research on tissue culture aspects of production are in preliminary stage and requires culture and process optimization for the development of a commercially viable process. This review states the present status and future challenges of plant tissue culture for azadirachtin production.

• Journal of Life Science
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• 제9권1호
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• pp.69-80
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• 1999

Some trials to alter the structure of extracellular polysaccharides by means of biotransformation and microbial modification have been reported. Seaweed alginate was acetylated by intact and resting cells of Pseudomonas syringae ATCC 19304. Glucose analogs such as 3-O-methyl-D-glucose used as sole carbon sources was directly incorporated into curdlan by agrobacterium sp. ATCC 31749. The 2-amino-2-deoxy-D-glucose (glucosamine)and 2-acetamido-2-deoxy-D-glucose (N-acetylglucosamine) were incorporated into microbial cellulose by Acetobacter xylinum ATCC 10245. The changed monomeric composition in pullulan by Aureobasidium pullulans ATCC 42023 as well as zooglan by Zoogoea ramigera ATCC 25935 was another effect of glucose analogs used a carbon source. There was no effect of glucose analogs found in polysacharide-7 (PS-7) produced by Beijerinckia indica. ATCC 21423.

• Journal of Biosystems Engineering
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• 제14권1호
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• pp.8-15
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• 1989

Agricultural materials do not react in a purely elastic manner, and their responses when subjected to stress and strain are appeared from a combination of elastic and viscous behavior. Various researchers have studied the mechanical and rheological properties of the many agricultural materials, but those properties are available mostly foreign varieties of agricultural products. Rheological properties of rice seedlings become important to formulate the principles governing their mechanical behavior. The objectives of this study were to experimentally determine the stress relaxation properties of rice seedlings such as three Japonica-type and one Indica ${\times}$ Japonica hybrid in the transplanting age. The results of this study are summarized as follows; 1. The stress relaxation behavior could be described by the generalized Maxwell model. 2. The phenomenon of stress relaxation happened abruptly just after loading and this phenomenon weakened with the loading time lapsed. 3. With increase of the initial stress, the stress relaxation intensity and residual stress increased, while the relaxation time was constant with increased, while the relaxation time was constant with increase of the level of initial stress. 4. With increase of loading rate, the stress relaxation intensity increased, while the relaxation time and residual stress decreased.

• Applied Biological Chemistry
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• 제26권4호
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• pp.266-268
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• 1983

Dergree of gelatinization during cooking of Akibare(Janponica) and Milyang 23(Indica) rice was determined by X-ray diffractometry using a buit-in internal standard approach. The metod had a total coefficient of Variation of 99.9%. Milyang 23 showed slightly higher degree of gelatinization than Akibare during cooking at $100^{\circ}C$. Both rice was completely gelatinized after 20 minute cooking.

• Archives of Pharmacal Research
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• 제20권4호
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• pp.368-371
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• 1997

In an effort to increase of the antitumor activity of 2(S)-$2^{I}$,$5^{I}$-trihydroxy-7, 8-dimethoxyflavanone isolated from Scutellaria indica, we synthesized its analogues, II, III and IV. They showed potent cytotoxicity in vitro against cancer cell lines, L1210, K562 and A549. On the basis of $ED_50$ values against the cancer cell lines, III exhibited about 2-7 times stronger activity than I against various cell lines. We tested the antitumor activity of the analogues against Sarcoma 180 cells in vivo and evaluated the structure-activity relationship. The antitumor activity appeared to be related to the hydrogen bond between carbonyl group at C-4 and hydroxyl group at C-5, in contrast to cytotoxic action.

• The Plant Pathology Journal
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• 제25권2호
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• pp.189-192
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• 2009

The effect of plant extracts of eucalyptus (Eucalyptus chamadulonsis), garlic (Allium sativium), marigold (Tagetes erecta) and neem (Azadirachta indica) and essential oils were tested on the suppression of root-knot nematode Meloidogyne incognita under greenhouse and field conditions. In vitro study, all tested treatments had nematicidal effect on nematode juveniles after 24 and 48 hours from exposures. The highest percentage of nematode mortality was achieved by application of neem extract (65.4%), essential oils (64.4%) and marigold extract (60.5%), followed by garlic and eucalyptus extracts (38.7-39.5%). Under greenhouse and field conditions, neem extract and essential oils treatments were more effective in reducing population numbers of the M. incognita in soil and root gall index compared to other treatments. In field experiments, the maximum protection of tomato plant against root-knot nematode was obtained by application of neem and essential oil treatments, 44.2 and 32.6%, respectively.