• Title/Summary/Keyword: biotype

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Characterization of a salicylate-degrading strain of pseudomonas putida (Salicylate를 생분해하는 pseudomonas putida의 특성)

  • 홍순우;하영칠;이계준;배경숙
    • Korean Journal of Microbiology
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    • v.24 no.1
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    • pp.51-56
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    • 1986
  • Eight strains of the bacteria capable of growing on salicylate as the sole carbon source were isolated form soil and river water. Three of these isolates were identified as Acinetobacter calcoaceticus (AcBl), Pseuomonas putida biotype B (PpB2), and P. putida biotype A (PpB3). Effects of temperature, pH and C source concentration on biodegradation of salicylate by PpB3 were wxamined. The optimum conditions were as follows; $30^{\circ}C$ for temperature, 7.0 for pH, and 10mM for C source concentration. Ultraviolet scanning spectrum of the salicylate was measured. The spectrum has two peaks at 225nm and 292nm. The spectra of the culture filtrates indicate that ring degradation of salicylate is accomplished.

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Expressed Sequence Tags of the Wheat-rye Translocation Line Possessing 2BS/2RL

  • Jang, Cheol-Seong;Hong, Byung-Hee;Seo, Yong-Weon
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.44 no.3
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    • pp.302-307
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    • 1999
  • Hamlet (PI549276) possessing 2RL was obtained by cross between a wheat cultivar ND7532 (Froid/Centurk) and a rye cultivar Chaupon. Chaupon was known to have resistant gene to biotype L of Hessian fly [Mayetiola destructor (Say)] larvae. The wheat-rye translocation line (Coker797*4/Hamlet) was also known to be resistant to biotype L of Hessian fly larvae. We analysed a set of 96 ESTs from the wheat-rye translocation line (2BS/2RL). ESTs were classified by various physiological processings, such as primary metabolism, secondary metabolism, transcription, translation, transport, signal transduction, defense, transposable element, and others. Three sequences encoding thioredoxin peroxidase, 26S rRNA, and rubisco small subunits were homologous to registered genes in rye. Although limited number of clones were used to develop ESTs, these clones and their sequence information may be useful for researchers studying general physiology and molecular biology on the translocation line.

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Isolation of Staphylococcus Aureus from the Tonsils of Healthy Pigs (돼지편도로부터 STAPHYLOCOCCUS AUREUS균의 분리)

  • 이재봉;고주영;조영보;정승기
    • Korean Journal of Veterinary Service
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    • v.14 no.2
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    • pp.143-147
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    • 1991
  • Between June and August 1990, the tonsils of 86 healthy pigs were examined for the presence of staphylococci. All of the pigs examined harboured Staphylococci in the tonsils, the most predominant Staphylococcus species was Staphylococcus aureus(45.3%) followed by Staph hyicus subsp chromogenes (20.9%), Staph hyicus subsp hyicus (16.3%), Staph hominis(4.7%), Staph simulans(2.3%) and Staph xylosus(1.2%), Unidentifiable species were isolated from 3(3.5%) of the 86 tonsils examined. Thirty-nine strains of Staph aureus were subjected to the biotyping scheme of Hajek & Marsalek all the strains were classified as biotype B.

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Isolation and identification of Agrobacterium spp. using carrot disc and transformation of Nicotiana gluca by selected strains (당근 절편을 이용한 Agrobacterium spp. 분리, 동정과 선발균주에 의한 연초의 형질전환)

  • Yang, Deok-Chun;Yang, D.C.;Choi, K.T.
    • Journal of the Korean Society of Tobacco Science
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    • v.13 no.1
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    • pp.43-52
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    • 1991
  • These studies were carred out to obtain the transformant from tobacco cells by Agrobacterium spp. from crown gall and soil at the natural field in Korea, and identified their virulence. Kodo's and Clark's selective media were used for isolation of Agrobacterium spp. In these media, total of 99 strains were characterized based on the morphological characteristics of colonies. Among them 34 strains were able to induce on carrot discs. And hypervirulent strains C23-1 and K29-1 were identified as Agrobacterium tumefaciens biotype 1 and biotype 2, respectively. These strains formed fast growing, larger gall as compared to those induced by other strains on the carrot discs. Transformed tobacco callus was initiated on the phytohormone free MS medium with 250$\mu\textrm{g}$/ml carbenicillin after co-cultivation of tobacco stem explants and Agrobacteria. On the phytohormone free media, shoot was rarely formed from transformed callus. However, these shoot were teratoma shoots which were not grown as normal shoot, and teratoma shoot from transformant by C23-1 was smaller than that of K29-1.

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Variation in Demography of Taraxacum officinale Seeds Harvested from Different Seasons

  • Yang, Hyo-Sik;Oh, Man-Ho
    • The Korean Journal of Ecology
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    • v.26 no.2
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    • pp.82-86
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    • 2003
  • We investigated the variation in adaptation to growth for four ecotypically-differentiated population of Taraxacum officinale found naturally in temporal environmental heterogeneity. Seeds collected from the four seasons were germinated in incubators and were grown for four months in greenhouse to test genetic variation among biotypes. Biotypes, segregated by seeds collected seasonally, were the part of natural population in Mokpo, South Korea. Each biotype was different in total dry weight of seeds, biomass, and leaf area, confirming previous finding. Differences between biotypes grown under a common environment indicated a genetic basis to their distinct demographic rates. Therefore, biotypes with similar annual rates of growth and contrasting seasonal rates should persist in the population. This differential response suggests that temporal variation in environment may be responsible, in part, for the maintenance of genetic variation within populations.

Relationship between the Caries Experience of Korean School Children and the Distribution of Streptococcus mutans in Dental Plaque (한국아동(韓國兒童)의 치아우식경험과 치면상(齒面上) Streptococcus mutans 분포(分布)에 대(對)한 연구(硏究))

  • Kim, Kack-Kyun;Choe, Son-Jin;Lim, Chang-Yoon;Chang, Woo-Hyun
    • The Journal of the Korean Society for Microbiology
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    • v.18 no.1
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    • pp.11-21
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    • 1983
  • Various investigations have been carried out to elucidate the causative relationship between specific oral bacterial species and dental caries since it was first demonstrated that selected streptococoal species produced dental caries in germfree rats when fed a high-sucrose diet. Now, S. mutans is considered to play an important role in the development of dental caries in animals and humans, and only a limited number of species of bacteria other than S. mutans are occasionally found to be cariogenic in experimental animals. In this regard, association of the number of S. mutans in approximal plaque with caries experience (DMFT) was studied from 137 Korean school children($10{\sim}11$ year old). Biotypes of the collected strains of S. mutans were determined, and their relationship with caries status was also examined. The following results were emerged from the study. 1. S. mutans was detected in the plaques of all children. 2. Statistically significant positive correlation(r=0.445, p<0.001) was found between the caries experience(DMFT) and the number of S. mutans in approximal plaques. 3. The number of S. mutans were significantly higher(p<0.001) in plaques removed from carious surface than from sound surface. 4. The most frequent biotype was biotype I(78.8%), followed by IV(33.1%) and V(09.5%). Biotype II was isolated in the plaque of two children(1.7%) only. 5. There was no apparent relation of specific biotypes to carious status.

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Periodontal biotype modification using a volume-stable collagen matrix and autogenous subepithelial connective tissue graft for the treatment of gingival recession: a case series

  • Kim, Hyun Ju;Chang, Hyeyoon;Kim, Sungtae;Seol, Yang-Jo;Kim, Hyeong-Il
    • Journal of Periodontal and Implant Science
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    • v.48 no.6
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    • pp.395-404
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    • 2018
  • Purpose: The purpose of this study was to propose a technique for periodontal biotype modification through thickening of the entire facial aspect using a volume-stable collagen matrix and autogenous subepithelial connective tissue graft (CTG) for the treatment of gingival recession. Methods: Four systemically healthy patients showing Miller class I or class II gingival recession in the mandibular incisor area were included in this study. Full-mouth scaling and root planing procedures were performed at least 4 weeks prior to periodontal plastic surgery. A split-thickness flap with a horizontal intrasulcular incision and 2 vertical incisions was used in cases 1-3, and the modified tunnel technique was used in case 4 for coronal advancement of the mucogingival complex. After the exposed root surfaces were debrided thoroughly, double-layered volume-stable collagen matrix was placed on the apical part of the recession and a subepithelial CTG harvested from the palatal area was placed on the coronal part. The amount of root coverage at 3 months postoperatively was evaluated in cases 1-3, and facio-lingual volumetric changes were analyzed in cases 1 and 2. Results: Healing was uneventful in all 4 cases and complete root coverage was shown in cases 1-3. In case 4, reduction of gingival recession was observed at 3 months after surgery. In cases 1 and 2, a comparison of stereolithographic files from the preoperative and postoperative time points demonstrated that the entire facio-lingual volume had increased. Conclusions: The surgical technique suggested herein, using a volume-stable collagen matrix and autogenous subepithelial CTG, may be an effective method for periodontal biotype modification through thickening of the entire facial aspect for the treatment of gingival recession.

A Report on Mixed Occurrence of Tobacco Whitefly (Bemisia tabaci) Biotypes B and Q in Oriental Melon Farms in Kyungpook Province, Korea (담배가루이 생태형 B와 Q가 같이 발생하는 경북 참외재배 지역 보고)

  • Kim, Eunsung;Kim, Yonggyun
    • Korean journal of applied entomology
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    • v.53 no.4
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    • pp.465-472
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    • 2014
  • The tobacco whitefly, Bemisia tabaci, infest the Oriental melon and give significant economic damage along with its virus-vectoring activity. Various biotypes of B. tabaci have been well known and are classified depending on the severity of crop damage and insecticide susceptibility. In this study, B. tabaci adults were collected in the melon fields located in Poongchun-myeon, Andong, Korea and diagnosed on their biotypes using PCR molecular markers. From the all the 11 greenhouses, B. tabaci biotype Q was identified. In addition, biotype B adults were also found from the 4 greenhouses. These results report the first occurrence of B. tabaci at the Oriental melon farms in Gyeongbuk province with mixed infection by the two biotypes in the area.

The laterally closed tunnel for the treatment of mandibular gingival recession in thin biotype patients: case report (얇은 치주 생체형 환자에서 교정 치료 후 발생한 하악 전치부 치은 퇴축에 대한 laterally closed tunnel procedure의 처치: 증례보고)

  • Kim, Hyun-Joo;Kwon, Eun-Young;Lee, Ju-Youn;Joo, Ji-Young
    • Journal of Dental Rehabilitation and Applied Science
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    • v.35 no.4
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    • pp.253-259
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    • 2019
  • In this case report, gingival recession of the mandibular anterior teeth was treated with a laterally closed tunnel technique. Two patients had altered the inclination of mandibular anterior tooth during past orthodontic treatment and had periodontal thin biotype. The recipient site was formed by tunneling method, and the connective tissue graft obtained from the palatal side was placed in the tunnel, and the margins of flap were gathered at the center of the root and sutured. Despite the thin periodontal biotype, the root coverage was successfully obtained, keratinized gingiva was increased, and aesthetics were achieved by harmonizing with surrounding tissues in terms of shape and color.

Isolation of pathogenic Photobacterium damselae subsp. damselae from olive flounder, Paralichthys olivaceus (넙치, Paralichthys olivaceus에서 병원성 Photobacterium damselae subsp. damselae의 분리)

  • Kwon, Mun-Gyeong;Park, Saung-Un;Bang, Jong-Deuk;Park, Soo-Il
    • Journal of fish pathology
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    • v.18 no.3
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    • pp.205-214
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    • 2005
  • The isolates, which has caused considerable damage to the olive flounder farm located in the eastern coast of Korea showed 99% sequence homology in the comparison of 16s rRNA gene of P. damselae subsp. damselae ATCC 33539. The present P. damselae was identical to the biotype No.8 in Pedersen et al. (1997) and the same LPS protein pattern as P. damselac subsp. damselae ATCC 33539. The comparison of infection rates among present P. damselae and Vibrio spp. showed that isolated P. damselae was the highest, followed by V. anguillarium, V. harveyi. and V. ordalii.