유산 완충용액의 pH 및 포화도 변화에 따른 법랑질 내 수산화인회석 결정 형태의 변화

전영의,정일영,노병덕,이찬영 大韓齒科保存學會 2007 Restorative Dentistry & Endodontics Vol.32 No.6

Since it was reported that incipient enamel caries can be recovered, previous studies have quantitatively evaluated that enamel artificial caries have been remineralized with fluoride, showing simultaneously the increase of width of surface layer and the decrease of width of the body of legion. There is, however, little report which showed that remineralization could occur without fluoride. In addition, the observations on the change of hydroxyapatite crystals also have been scarcely seen. In this study, enamel caries in intact premolars or molars was induced by using lactic acidulated buffering solutions over 2 days. Then decalcified specimens were remineralized by seven groups of solutions using different degree of saturation (0.212, 0.239, 0.301, 0.355) and different pH (5.0, 5.5, 6.0) over 10 days. A qualitative comparison to changes of hydroxyapatite crystals after fracturing teeth was made under SEM (scanning electron microscopy) and AFM (atomic force microscopy). The results were as follows : 1. The size of hydroxyapatite crystals in demineralized area was smaller than the normal ones. While the space among crystals was expanded, it was observed that crystals are arranged irregularly. 2. In remineralized enamel area, the enlarged crystals with various shape were observed when the crystals were fused and new small crystals in intercrystalline spaces were deposited. 3. Group 3 and 4 with higher degree of saturation at same pH showed the formation of large clusters by aggregation of small crystals from the surface layer to the lesion body than group 1 and 2 with relatively low degree of saturation at same pH did. Especially group 4 showed complete remineralization to the body of lesions. Group 5 and 6 with lower pH at similar degree of saturation showed remineralization to the body of lesions while group 7 didn't show it. Unlike in Group 3 and 4, Group 5 and 6 showed that each particle was densely distributed with clear appearance rather than crystals form clusters together. 법랑질 초기 우식이 회복된다는 것이 보고된 이래 법랑질에 대하여 불소를 첨가한 상태에서 행했던 이전의 연구들은 법랑질 인공우식의 재광화가 표면층의 증가와 함께 병소본체의 폭 감소가 일어난다는 정량적인 평가는 많이 하였으나 불소를 첨가하지 않은 상태에서는 재광화가 일어났다는 연구는 부족하였고, 또 수산화인회석 결정의 입자 변화에 대한 관찰도 미비하였다. 본 연구는 탈회나 균열이 없는 소구치 및 대구치를 대상으로 탈회 완충용액을 이용하여 법랑질을 2일간 탈회시키고, pH와 포화도가 상이한 7가지 유산 완충용액으로 10일 동안 재광화를 유도한 후 치아를 파절시켜 수산회인회석 결정의 변화를 원자현미경과 주사전자현미경을 이용하여 정상적으로 비교 관찰하여 다음과 같은 결과를 얻었다. 1. 탈회된 부위에서 관찰된 수산화인회석 결정은 정상적인 수산화인회석 결정보다 크기가 작았으며 결정 사이의 공간이 증가하면서 결정들이 불규칙하게 존재하는 것이 관찰되었다. 2. 재광화된 부위에서는 탈회에 의하여 형성된 빈 공간에 작은 수산화인회석 결정이 새로 침착되는 양상과 결정들이 융합하여 다양한 모습을 갖는 더 커진 결정들을 관찰할 수 있었다. 3. 동일한 pH에서 포화도가 더 높은 3군, 4군은 1군, 2군에 비하여 표면층에서부터 병소본체까지 작은 결정들이 모여 큰 cluster를 형성하였으며 특히 4군에서는 병소본체까지 완전한 재광화가 일어났다. 비슷한 포화도에서는 pH가 더 낮은 5군, 6군은 7군에 비하여 병소본체까지 재광화가 일어났으며 3군, 4군처럼 결정들이 모여 cluster를 형성하기보다는 개개의 입자들이 뚜렷한 외형을 가지며 매우 치밀하게 분포되어 있었다.

심한 골병변으로 발현된 기능성 낭종성 부갑상선 선종

전숙,김영희,박지영,고관표,박철영,김덕윤,우정택,김성운,김진우,김영설,고석환 대한내분비학회 2003 Endocrinology and metabolism Vol.18 No.2

낭종성 부갑상선 선종과 심한 골병변을 동반한 부갑상선 기능항진증은 매우 드문 질환으로서, 저자들은 양측 고관절의 통증을 초기 주소로 내원한 환자에서 고칼슘혈증과 부갑상선 호르몬 증가, 골병변의 방사선적 소견을 통해 부갑상선 기능항진증을 진단하고, 경부 초음파와 컴퓨터 단층 촬영, 부갑상선 스캔검사 및 수술중 부갑상선 낭종액 검사 등을 통해 기능성 부갑상선 낭종의 한 종류인 낭종성 부갑상선 선종을 진단하고 수술적 제거를 통하여 정상화된 1예를 경험하였다. A cystic parathyroid adenoma is rare. A case of primary hyperparathyroidism, with the cystic formation of a parathyroid adenoma and a severe bony lesion, is reported. A 52-year-old male was admitted due to pain in both hips and for evaluation of hypercalcemia. The plasma level of the intact parathyroid hormone (iPTH) was elevated to 1424 pg/mL. Ultrasonography and the computed tomography revealed a parathyroid cyst on the left thyroid lower pole. Parathyroid scintigraphy detected a parathyroid adenoma. A radiograph showed a subperiosteal bone resorption on the phalanges, and a brown tumor (osteitis fibrosa cystica) on the femur shaft was noted. A surgical excision of the parathyroid adenoma was performed. The PTH level in the cystic fluid was increased. A histological examination confirmed a cystic parathyroid adenoma. The PTH level was normalized after the operation (J Kor SOC Endocrinol 18:214-220, 2003).

Allelopathic Potential and Antioxidant Activity of Leaf Extracts from Several Wild Plant Species

Chon,Sang-Uk,Cha,Young-Ju 한국자원식물학회 2004 Plant Resources Vol.7 No.1

Several wild plant species are known to contain biologically active substances that are allelopathic to weed species as well as antioxidant to foods. Plant extracts or residues from leaves of 4 species, Achyranthes japonica (speedwell), Cucumis sativus (Cucumber), Trifolium repens (white clover), and Vicia angustifolia (narrowleaf vetch) were bioassayed against Medicago sativa (alfalfa) or Echinochloa crus-galli (barnyard grass) to determine their allelopathic effects, and used for measurement of antioxidant activities. The aqueous extracts applied on filter paper significantly inhibited root growth of alfalfa. Aqueous extracts or residues from V. angustifolia showed the most inhibitory effect on alfalfa or barnyard grass seedling growth and followed by A. japonica and T. repens. Oxidative stability by Rancimat method, antioxidant activity by TBA (2-thiobarbituric acid) method and DPPH (1,1-diphenyl-2-picrylhydrazyl) radical scavenging activity for the ground samples or methanol extracts were the greatest in V. angustifolia, although were less than those of commonly used antioxidants, BHT (butylated hydroxytoluene) and ascorbic acid. These results suggest that the wild plant species had potent allelopathic and antioxidant activities, and that their activities differed depending on plant species.

國內産 大理石의 地質工學的 特性

정영욱(Young Wook Cheong),전효택(Hyo Taek Chon) 대한자원환경지질학회 1990 자원환경지질 Vol.23 No.4

Mechanical, physical and petrographic properties of seventeen marble specimens collected from ten marble mines in Korea were investigated. Studied marbles were mainly composed of calcite, dolomite, and various amounts of serpentine, tremolite, olivine, quartz and opaque minerals. Complete and sutured textures were dominant. Compressive strength measured normal to the bedding plane is larger almost two times than that measured parallel to the bedding plane. From the results of Shore hardness test on marbles, water content was an important factor to decrease Shore hardness values. Engineering geological properties, especially, compressive strength, Young’s modulus, wear resistance and water absorption could be controlled by the presence of quartz, and the type of marble texture. Water absorption-porosity, compressive strength-Young’s modulus, and impact strength index-Los Angeles abrasion couples show good correlation. According to the comparative utility as commercial stone, it could be concluded that marbles from the Banglim mine, Songbo mine, Kwangdeok mine and Bongjeong mine were superior to that of other studied marbles.

잣나무 苗木의 養苗法 改善에 關한 硏究 Ⅲ : 播種時期이 差에 따른 잣나무 幼苗의 生長 比較 Effects of seeding time on the growth of young seedling

金英彩,金尙根 慶熙大學校 1984 論文集 Vol.13 No.-

After hastening seed germination by means of open ground storage during the period from the fall to next year spring, the growthes of seedlings seeded at different days were compared. The results obtained were summarized as follows: 1. The effects of seeding time on the length, diameter and weight growth of seedlings were irregular. However, each of the maximum growthes appeared on the 26th and 30th of March. Comparatively, the early seeding, the last ten days of March, was favorable for young seedling growth. 2. The contribution rates to the length, diameter, and weight growth by seeding time was 32.9%, 8.8% and 60.9%. The weight growth of seedlings was especially effected by seeding time.

癩性結節紅斑(Erythema nodosum leprosum)에 對한 Colchicine의 效果

全準烈,申汀植,田寅淇,金永杓 大韓癩學會 1985 癩學 會誌 Vol.18 No.1

癩患者 血淸內의 adenosine deaminase에 關한 硏究

全準烈,金允燮,田寅淇,金永杓 大韓癩學會 1981 癩學 會誌 Vol.14 No.1

쓰레기매립지반 개량에 관한 실험적 연구

전용백,정영갑 대구대학교 산업기술연구소 2004 産業技術硏究 Vol.16 No.1

This study experimented dividing compaction load by dynamic compaction test and an oil pressure hammer compaction test for consolidation strength characteristics experimental feedback about soil change aspect of waste landfill ground and revelation of compaction effect as underground research about consolidation behavior of waste landfill ground by compaction load, foot weight and percussion number of times were adapted differently each other with uniformity drop head when dynamic compaction test, and hammer scale and percussion number of times were adapted differently also when oil pressure hammer compaction test.

비교문학의 장(場) : 세계문학 Weltliteratur

전영애 한국독어독문학회 2003 獨逸文學 Vol.88 No.-

Die Reichweite der Komparatisik wird hier unter Beru¨chsichtigung der Erweiterungsmo¨glichkeit der Germanistik gemessen. Die Geschichte der Komparatistik wird zuerst im Grundriss betrachtet: als Entwicklung von der positivistischen Praxis zur Wissenschaft des Dialogs". Weltliteratur" war bei Goethe ein okkasioneller Begirff, bat aber u. a. der Komparatistik eine markante Markierungslinie fu¨r ihr Feld angeboten. Beachtenswert ist der pazifistische Moment dieses Begriffs bei Goethe, denn Goethe betrachtete die Poesie als das Gemeingut der Menschheit", war auf die Fo¨rderug des Versta¨ndnis unter Vo¨lkern bedacht und forderte seine Zeitgenossen auf, zur Be-schleunigung der Zeit der anmarschierenden Weltliteratur" beizutragen. Entsprechend scha¨tzte er die U¨bersetzungsta¨tigkeit hoch. Indem er sogar im Eigentlichen jedes Volkes eben das Mittel der Ero¨ffnung sah, weitete Goethe die national beengten Blicke entscheidend. Ein solcher Pazifismus ist fu¨r die spa¨teren Jahrhunderte noch relevanter. Seit dem beginnenden zwanzigsten Jahrhundert etwa bringt gefo¨rderte Umkehr in der Welt, die beginnende Globalisierung, beispiellose Gewalt mit sich. Dies fu¨hrt nicht nur zum ontologischen Paradigmenwechsel. Probleme der verletzten, entwurzelten Menschen erhalten dringende Aktualita¨t. Eine Reihe von Werken in diesem Themenkreis wird anschließend kurz betrachtet: von der Lyrik nach Auschwitz bis zur Emigrantenliteratur koreanischer Autoren. Soiche Werke scha¨rfen unser Auge fu¨r die Literatur, die an der Grenze wie in der Grenzsituation entsteht, aber daru¨ber hinaus geht. Weil die ausla¨ndischen Germanisten mehr oder weniger zugleich Komparatisten sind, ist ihnen auch die Aufgabe zuzu-schreinben, qualitative literarische Grenzprodukte gerecht zu csha¨zen und weiter- zureichen. Dies wa¨re eine fundierte Erweiterung der Germanistik im Sinne der Welt- literatur, und hier ero¨ffnet sich auch das Feld der Komparatistik.

청바지의 제품평가와 상표이미지에 관한 연구

전영미,정명선 全南大學校家政科學硏究所 1996 生活科學硏究 Vol.6 No.-

The main purpose of this study was to examine the jean brand image according to product evaluation such as brand purchasing experience, perceived quality, perceived value and purchasing intention. In addition, brand awareness, brand preference, brand satisfaction after purchasing were also investigated. The questionnaire was distributed to 500 high school students and undergraduate students. Data from 430 respondents were analyzed using Descriptive statistics, Frequency, percentage, t-test. The results were as follows : 1. Brnad-awareness ranked highly in the Bang-Bang and displayed following ranks as GUESS, Levi's, Lee, C.K, GET USED, OPT, M.F.G. 2. Brnad-preference ranked highly in the Levi's and displayed following ranks as GET USED, OPT, GUESS, C.K, Lee, M.F.G, Bandg-Bang. 3. Brand-image evaluative attributes were significantly different between brand experience group and non-experience group except price at more than the level of p≤.05. 4. Brand-image evaluative attributes affected to partially perceived quality, perceived value, purchasing intention at more than the level of p≤.05. 5. Brand-awareness significantly correlated with brand-preference, perceived quality, perceived value, purchasing intention at more than the level of p≤.05. Perceived quality significantly correlated with perceved value and purchasing intention at the level of p≤.05. But Purchasing experience negative correlated with brand-preference, perceived quality, perceived value, purchasing intention.