• Title/Summary/Keyword: Dormant

검색결과 262건 처리시간 0.032초

바랭이 종자(種子)의 휴면타파(休眠打破)에 관한 연구(硏究) (Effect of Various Factors on Dormancy-Breaking of Digitaria sanguinalis Seeds)

  • 김길웅;신동현
    • 한국잡초학회지
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    • 제3권2호
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    • pp.137-142
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    • 1983
  • 휴면상태(休眠狀態)에 있는 바랭이 종자(種子)의 발아(發芽)에 영향(影響)미치는 여러 가지 요인(要因)을 처리(處理)하여 얻어진 결과(結果)를 요약(要約)하면 다음과 같다. 1. 질산처리(窒酸處理)는 $10^{-2}$ M 농도(濃度)에서 약(約) 20%, 농황산연속(濃黃酸連續) 8 분간(分間) 처리(處理)에서 37.8%의 발아력(發芽力)을 보여 이들 두 처리(處理)는 무처리(無處理)에 비(比)하여 유의(有意)한 휴면타파효과(休眠打破效果)를 보였다. 2. 변온(變溫)($15^{\circ}-35^{\circ}C$$20^{\circ}-35^{\circ}C$) 처리(處理)는 처리후(處理後) 10 일째 약(約) 89%의 높은 발아력(發芽力)을 보여서 빛과 더불어 바랭이 종자(種子)의 휴면타파(休眠打破)에 가장 효과적(效果的)인 방법(方法)으로 간주되었다. 3. 종피제거(種皮除去)로 72%의 발아력(發芽力)을, 종피(種皮)의 유무(有無)에 관계(關係)없이 빛만의 조사(照射)로 약(約) 88-89%의 극히 높은 발아력(發芽力)을 보여서 변온처리(變溫處理)와 더불어 가장 효과적(效果的)인 휴면타파방법(休眠打破方法)으로 구명(究明)되었다. 4. 변온하(變溫下)에서 GA, BA 및 이들의 혼합처리(混合處理) 등(等)은 변혼(變混) 그 자체에 의(依)한 휴면타파(休眠打破) 효과(效果)를 증가(增加)시키지 못하고 억제(抑制)시키는 현상을 보였다. 정온하(定溫下)에서의 평균발아력(平均發芽力)은 변온처리시(變溫處理時)보다 훨씬 낮았으나 생장조절제(生長調節劑) 상호처리간(相互處理間)에는 유의(有意)한 발아력(發芽力)을 보였다.

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블루베리 '듀크' 품종의 무가온 시설재배시 전정시기가 수체생장과 과실수량에 미치는 영향 (Bush Growth and Yield of Highbush Blueberry 'Duke' as Influenced by Different Pruning Times in Unheated Plastic House)

  • 천미건;이서현;박경미;최성태;황연현;장영호;김진국
    • 생물환경조절학회지
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    • 제30권3호
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    • pp.212-217
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    • 2021
  • 본 시험은 무가온 시설재배 조건에서 북부하이부쉬 블루베리의 전정시기가 영양 생장과 과실 생산에 미치는 영향을 구명하고자 수행되었다. 180L 용기에서 재배한 7-9년생 '듀크' 품종을 대상으로 2018년과 2019년 6월 20일(수확 후 30일경), 7월 20일, 8월 20일에 하계전정을 실시하였고, 2019년과 2020년 1월 20일에 동계전정(관행)을 목질부 생장량의 30%를 제거하는 방법으로 처리하였다. 하계 전정구들은 2년 연속 전정 이듬해인 2020년 10월 15일에 신초 생장이 현저히 감소하였는데, 주당 총 신초장은 6월, 7월, 8월 전정구가 동계 전정구에 비해 각각 47%, 37%, 33%로 작았고 하계전정 시기가 늦을수록 신초 생장이 감소하는 경향이었다. 하계전정 1년차와 2년차 이듬해의 과실 특성은 전정 시기의 영향이 없었고, 주당 수량은 전정 1년차 이듬해인 2019년에는 차이가 없었으나 2년 연속 처리 이듬해 2020년에는 동계 전정구가 2.9kg인데 반해 하계 전정구들은 동계 전정구에 비해 21~38%가 감소하였다. 따라서 무가온 시설재배 조건에서 북부하이부쉬 '듀크'의 하계 전정은 동계 전정에 비해 수세가 약화되어 수량이 감소할 수 있는 것으로 나타났다.

Trichoderma koningii의 conidiospore로부터의 원형질체 생성에 관한 전자현미경적 연구 (Electron Microscopic Study of Protoplast Formation from the Conidiospore of Trichoderma koningii)

  • 박희문;임헌만;홍순우;하영칠
    • Applied Microscopy
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    • 제14권2호
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    • pp.38-51
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    • 1984
  • Fine structure of dormant and swollen conidiospore from Trichoderma koningii and the mechanism of protoplasting from the conidiospore were studied by scanning and transmission electron microscopy. The cell wall of dormant conidiospore was two-layered structure which consisted of electron dense outer layer and electron transparent inner layer. After 8.5 hrs incubation. the conidiospore was swollen and the outer layer of cell wall shown unequal thickness and partial breakage. Protoplast was released through the pore which has been formed by the breakage of outer layer and dissolution of newly synthesized cell wall for germ-tube formation. Swollen conidiospore and protoplast in releasing process contained various cell organelles and vacuoles with electron dense materials. The protoplast contained looser cytoplasm and had no cell wall materials outside of plasmamembrane.

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잠재적 이방성 핏치를 이용한 탄소성형체 제조 (Preparation of Carbon Solid from Dormant Mesophase Pitch without using a Binder)

  • 김제영;이성영;최재훈;박양덕
    • 한국세라믹학회지
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    • 제29권5호
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    • pp.396-402
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    • 1992
  • Carbon solid was prepared from dormant mesophase pitch (DMPP) without using a binder and its properties were characterized. DMPP powder was stabilized with air or nitric acid in pretreatment stage so that it might not soften in later heat ttreatment stage. Optimum sintering properties were obtained from carbon powder with 2.36∼2.38 of C/H atomic ratio and 1.27∼1.40 of C/O atomic ration in air stabilization. In nitric acid stabilization, optimum sintering properties were obtained when 20∼40 vol.% of nitric acid solution was used. Compressive strength increased up to 1200$^{\circ}C$ of heat treatment temperature, and the highest compressive strength and bulk density of carbon solid from DMPP were 3000 kgf/㎤, respectively. The optical properties of carbon solid obtained was fine mosaic structure. Carbon solid after graphitization showed the properties of hard carbon due to stabilization and its shore hardness was 120.

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Ornamented Resting Spores of a Green Alga, Chlorella sp., Collected from the Stone Standing Buddha Statue at Jungwon Miruksazi in Korea

  • Klochkova, Tatyana A.;Kim, Gwang-Hoon
    • ALGAE
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    • 제20권4호
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    • pp.295-298
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    • 2005
  • The growth of subaerial microalgae on historic buildings or various cultural properties causes discoloration and physico-chemical deterioration of the surfaces. We collected a subaerial chlorophyte, Chlorella sp., from the stone Standing Buddha statue at Jungwon Miruksazi, which is a national treasure of Korea, and found dormant, thickwalled spores with regular pentagonal ornamentation along with the vegetative Chlorella cells. The morphology of Chlorella resting spores was compared to that of the other green algal resting cells. The ornamented spores and smooth-walled vegetative cells revived in 2 weeks in a liquid freshwater medium and started reproduction by autospores. To our knowledge, the ability of Chlorella to form ornamented dormant spores in drought condition was not previously recorded. The ornamentation of spores would supplement taxonomic characteristics of this genus.

특용수종의 유대접목에 관한 연구 (II) 유실수종의 임면지유근역위접목 및 유근역위아접에 관하여(예보) (Studies on Juvenile Tissue Grafting of Some Special-use-Trees (II) An Experiment on Inverted Radicle Grafting of Crop-Tree-Species)

  • 박규수
    • Journal of Plant Biology
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    • 제11권3호
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    • pp.8-17
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    • 1968
  • A grafting method, cleft grafting of ordinary dormant scion into an inverted radicle of a germinated seed was tested with good success for chestnut as well as for walnut trees. It was seen that verticilate roots which were produced from the cut and of radicle after grafting made a complete union with scion and made healthy development to produce a successful graft. The radicle before secondary rootlets emerged from its rooting zone was proved to be best stock for inverted radicle grafting. The dormant but was also used for grafting scion with success in this method. Though green house grafting gives higher survival, field grafting was also feasible by this method. Those early growing geason after grafting, the later development of root system and the shoot of the graft were to be studied in the future.

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경(줄기)흔을 중심으로 한 재배인삼의 연근판별 (Identification of Age of Cultivated Ginseng (Panax ginseng C.A. Meyer) based on Stem Vestige of Rhizome)

  • 이장호;이명구
    • Journal of Ginseng Research
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    • 제20권1호
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    • pp.72-77
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    • 1996
  • This study was conducted to establish an identification method age for cultivated ginseng (Panax ginseng C.A. Meyer) based on counting the stem vestige at rhizome. Weight, diameters of body and lateral roots, and ratios of those diameters were overlapped with those of other ages, so these are not enough as a criterion for identification of ginseng age. Since the stem vestige at rhizome was remained clearly from the 3rd-year age, root age can be the number of stem vestige +2. The number of stem vestige should be counted at the one side of rhizome with abundant vestige for multi stewed plant. It is necessary that the number of year-ring in root is investigated for rhizome damaged plant, but it must be considered that the new year-ring can be shown clearly after around loth of June. All dormant roots had damaged rhizome by some reasons.

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IP 기반-IMT 네트워크에서의 이동관리 메카니즘 향상기법 (Enhanced Mobility Management Mechanism in IP based-IMT Network Platform($IP^2$))

  • 정병화;박수현
    • 한국정보처리학회:학술대회논문집
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    • 한국정보처리학회 2005년도 춘계학술발표대회
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    • pp.1307-1310
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    • 2005
  • $IP^2$(IP based-IMT Network Platform)은 유비쿼터스 플랫폼으로서 백본 망에서 IP 를 IPha(IP host address)와 IPra(IP routing address)으로 두 가지를 사용하여서 이동성을 지원한다. 그리고 MN(Mobile Node)도 Active 상태와 Dormant 상태로 두 가지 상태로 나뉘는데 Dormant 상태에서 상대방이 통신을 요청하면 페이징(Paging) 과정을 통해서 Active 상태로 전이된다. 페이징을 할 때 LA(Location Area)에 속해있는 모든 셀(Cell)에 페이징 메시지를 전송하게 됨으로서 네트워크의 자원을 과도하게 사용하게 된다. 이것을 해결하기 위해서 프럭시(Proxy) 를 두는 방안을 제안하였다. 프럭시에서 MN 들이 존재하는 셀 정보를 유지 함으로서 페이징 요청이 있을 때 정확한 셀에 메시지를 전송하게 되기 때문에 네트워크 자원의 낭비를 줄일 수 있다.

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Genotype Difference of Plant Regeneration from Dormant Bud Culture in Colocasia esculenta Schott.

  • Rha, Eui-Shik;Yoo, Nam-Hee;Kim, Hyun-Soon
    • Plant Resources
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    • 제2권2호
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    • pp.65-68
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    • 1999
  • This study was conducted to obtain the basic breeding information of Colocasia esculenta Schott. Effect of supplemental plant growth regulators and genotype difference were investigated on dormant bud tissue for proliferation. The plant regeneration ratio, plant height and root length were the best upon mixed treatment of 0.8mg/L IAA and 2.0mg/L zeatin. Both leaf weight and root weight were heavy upon culture in a dark condition. The leaf and root weights were heaviest in 6Pie sucrose concentrations. In several collected area the heaviest one was Binnangxin and then in the order of Suwon, Wanju and Puan. Genotype differences of tuber diameter and tuber weight were found in Suwon. Tuber weight was found in the order of Suwon (862mg) >Wanju(723mg) >Puan(649mg) >Binnangxin (424mg).

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항생제 내성률 감소를 위한 퍼시스터 세포 박멸과 인돌의 기능 (Eradicating Bacterial Persister Cells with Substituted Indoles to Reduce Antibiotic Resistance)

  • 박가린;송수연
    • Journal of Dairy Science and Biotechnology
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    • 제39권4호
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    • pp.145-156
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    • 2021
  • Antibiotics are used in many sectors, including the dairy industry, to prevent bacterial infections in humans, animals, and plants. When bacterial cells are exposed to stressors, such as antibiotic exposure, a subpopulation of the cells becomes dormant. This helps the pathogen to revive and reconstitute its pathogenicity. Thus, eradicating the dormant cells may be an effective strategy to reduce the development of antibiotic resistance in bacteria caused by the abuse of antibiotics. In recent years, a large number of indole-related compounds have been reported to eradicate persister cells. In this review, we provide a summary of the mechanisms of persister cell formation and resuscitation, and the ability of indole and substituted indoles to eradicate persister cells.