120 research outputs found
A new species Agrypnus (Sabikikorius) uidoensis sp. nov. (Coleoptera: Elateridae) from the Sand Dune Shore of Ui-do Island, Korea
No full textHan, Tae Man, Sim, Ha Sik, Lee, Seunghwan, Park, Hae Chul (2009): A new species Agrypnus (Sabikikorius) uidoensis sp. nov. (Coleoptera: Elateridae) from the Sand Dune Shore of Ui-do Island, Korea. Zootaxa 2134: 60-68, DOI: 10.5281/zenodo.27496
FIGURES 27–35 in A new species Agrypnus (Sabikikorius) uidoensis sp. nov. (Coleoptera: Elateridae) from the Sand Dune Shore of Ui-do Island, Korea
No full textFIGURES 27–35. Male genitalia and female reproductive organs of A. (S.) uidoensis sp. nov. 27: Aedeagus in a dorsal view; 28: Ditto in a profile view: 29: Ditto in a ventral view; 30: Apex region of the paramere in a dorsal view; 31: Ditto in a ventral view; 32: Ovipositor in a dorsal view; 33: Ditto in a profile view; 34: Female reproductive organs in a ventral view (BC: bursa copulatrix; Acgl: Accessory gland); 35: Bursa copulatrix in a ventral view.Published as part of Han, Tae Man, Sim, Ha Sik, Lee, Seunghwan & Park, Hae Chul, 2009, A new species Agrypnus (Sabikikorius) uidoensis sp. nov. (Coleoptera: Elateridae) from the Sand Dune Shore of Ui-do Island, Korea, pp. 60-68 in Zootaxa 2134 on page 67, DOI: 10.5281/zenodo.27496
Experimental studies of the effect of erosion on the tooth enamel surface by acid beverages puchased on the retail market
No full text치의학과/석사[한글]
청량음료가 치아표면 조직에 미치는 영향 및 불소처리에 의한 저항성을 관찰하기 위하여 저자는 시판되고 있는 몇가지의 청량음료들을 수거하여 불소도포에 의한 표면처리를 가한 치아와 대조치아들을 그 음료에 노출시켜 법랑질표면 침식상태들을 주사전자현미경으로 비교 관찰하므로써 다음과 같은 결론을 얻었다.
1. 시판 청량음료는 치아표면 조직을 침식시키며 그 정도에 있어서는 청량음료의 수소이온 농도에 따라 침식정도의 차가 안정된다.
2. 청량음료에 의한 치아표면 침식양상은 수소이온농도가 비교적 높은 음료에서는 법랑소주의 표면과 법랑소주주위에 다소의 침식이 인정되며 수소이온 농도가 낮은 음료에서는 법랑소주를 포함한 전법랑질에 현저히 침식되었음이 관찰되었다.
3. 불소처리함에 따른 침식예방효과는 수소이온 농도가 낮은 군에서는 효과가 낮고 치아표면의 불소국소도포처리의 침식예방효과는 수소이온 농도가 비교적 높은 군에서는 임상적으로 기대할만하다.
4. 청량음료를 사용함에 있어 불소 도포한 후 수소이온농도가 비교적 높은음료수군을 사용하면 임상적으로 큰 위해는 없으나 적절한 예방치과 시술이 안된 상태에서 낮은 수소이온농도의 청량 음료의 사용은 삼가는 것이 좋다고 사료된다.
EXPERIMENTAL STUDIES OF THE EFFECT OF EROS10N ON THE TOOTH ENAMEL SURFACE BY ACID
BEVERAGES PUCHASED ON THE RETAIL MARKET.
Joo-Sik Ha, D.D.S.
Dept of oral diagnosis, Graduate School, Yonsei University
(Director: Prof. Chong-Youl, Kim. D.D.S., M.S.D., Ph.D.)
The author collected come acid containing beverages to observe the influence
which acid containing beverages affect the tooth surface tissue and the resistance
of tooth which was treated with fluoride and counterpart tooth in the acid
containing beverages and comparatively observing the erosion of enamel surface, the
author came to the following conclusion.
1. Acid containing beverages on the market eroded the tooth surface tissue and
the erosion degree was determined by the pH concentration of beverages.
2. The erosion aspect of the tooth surface in terms of acid containing beverages
indicated some on the surface and surrounding enamel rod in the beverages which the
pH was comparatively high, and the erosion was observed greatly in all enamel
including the enamel rod in the beverages which pH was low.
3. The prevention effect of erosion in terms of fluoride treatment was low in the
beverages which pH was low and the prevention effect of erosion of the tooth which
was topical application with fluoride was comparatively high in the beverages which
pH was high.
4. When one drinks beverages, if beverages pH is high, there are no serious
harmful, but the author recommended net drinking the beverages which pH is low
under the situation lack of the proper preventive dentistry technique.
[영문]
The author collected come acid containing beverages to observe the influence which acid containing beverages affect the tooth surface tissue and the resistance of tooth which was treated with fluoride and counterpart tooth in the acid containing beverages and comparatively observing the erosion of enamel surface, the
author came to the following conclusion.
1. Acid containing beverages on the market eroded the tooth surface tissue and the erosion degree was determined by the pH concentration of beverages.
2. The erosion aspect of the tooth surface in terms of acid containing beverages indicated some on the surface and surrounding enamel rod in the beverages which the pH was comparatively high, and the erosion was observed greatly in all enamel including the enamel rod in the beverages which pH was low.
3. The prevention effect of erosion in terms of fluoride treatment was low in the beverages which pH was low and the prevention effect of erosion of the tooth which was topical application with fluoride was comparatively high in the beverages which pH was high.
4. When one drinks beverages, if beverages pH is high, there are no serious harmful, but the author recommended net drinking the beverages which pH is low under the situation lack of the proper preventive dentistry technique.restrictio
Bubble characteristics in three-phase fludized beds
No full text학위논문(석사) - 한국과학기술원 : 화학공학과, 1980.2, [ [ii], 83 p. ]Electroresistivity probe 를 이용하여 2차원 삼상유동층의 bubbles의 물리적 특성을 고찰하였다. bubble의 크기, 상승속도, volume fraction및 frequency에 미치는 fluid velocity, bed 높이의 영향을 검토하였다. gas-liquid system에서의 bubble의 특성도 아울러 검토하였다. 1.5 mm glass beads의 유동층에서 낮은 기상유속에서 bed contraction 이 관찰되었으며 bubble의 frequency는 bed 높이에 따라 감소하고 gas flow rate가 클수록 size distribution이 넓은 분포를 가졌다. Bubble의 breakup mechanism은 본 실험범위 에서는 Taylor instability 뿐만아니라 큰 particle을 작은 particle의 bed에 혼합하였을 때 particle penetration에 의한 bubble splitting도 일어날 수 있음을 밝혔다. bubble의 크기는 particle의 입자 크기에 영향을 받으며 각 실험변수간에 과 같은 경험식이 적용된다. 한편, bubble의 상승속도에 대해 bubbles의 크기, particle의 크기, 유체의 유속등에 대해 다음과 같은 실험식을 얻었다. 한국과학기술원 : 화학공학과
Crystal structure and functional implications of the tandem-type universal stress protein UspE from Escherichia coli
No full textThis article is distributed under the terms of the Creative Commons Attribution 4.0
International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and
reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to
the Creative Commons license, and indicate if changes were made.Abstract
Background
The universal stress proteins (USP) family member UspE is a tandem-type USP that consists of two Usp domains. The UspE expression levels of the Escherichia coli (E. coli) become elevated in response to oxidative stress and DNA damaging agents, including exposure to mitomycin C, cadmium, and hydrogen peroxide. It has been shown that UspA family members are survival factors during cellular growth arrest. The structures and functions of the UspA family members control the growth of E. coli in animal hosts. While several UspA family members have known structures, the structure of E. coli UspE remains to be elucidated.
Results
To understand the biochemical function of UspE, we have determined the crystal structure of E. coli UspE at 3.2Å resolution. The asymmetric unit contains two protomers related by a non-crystallographic symmetry, and each protomer contains two tandem Usp domains. The crystal structure shows that UspE is folded into a fan-shaped structure similar to that of the tandem-type Usp protein PMI1202 from Proteus mirabilis, and it has a hydrophobic cavity that binds its ligand. Structural analysis revealed that E. coli UspE has two metal ion binding sites, and isothermal titration calorimetry suggested the presence of two Cd2+ binding sites with a Kd value of 38.3–242.7μM. Structural analysis suggested that E. coli UspE has two Cd2+ binding sites (Site I: His117, His 119; Site II: His193, His244).
Conclusion
The results show that the UspE structure has a hydrophobic pocket. This pocket is strongly bound to an unidentified ligand. Combined with a previous study, the ligand is probably related to an intermediate in lipid A biosynthesis. Subsequently, sequence analysis found that UspE has an ATP binding motif (Gly269- X2-Gly272-X9-Gly282-Asn) in its C-terminal domain, which was confirmed by in vitro ATPase activity monitored using Kinase-Glo® Luminescent Kinase Assay. However, the residues constituting this motif were disordered in the crystal structure, reflecting their intrinsic flexibility. ITC experiments revealed that the UspE probably has two Cd2+ binding sites. The His117, His 119, His193, and His244 residues within the β-barrel domain are necessary for Cd2+ binding to UspE protein. As mentioned above, USPs are associated with several functions, such as cadmium binding, ATPase function, and involvement in lipid A biosynthesis by some unknown way
2G HTS Magnet With Smart Insulation Method
No full textThis paper proposes an advanced method to satisfy both the stability and charging/discharging time constant requirements of second generation high-temperature superconductor (2G HTS) magnets. This novel method entails installing metal-insulator transition (MIT) material between the turns of the 2G HTS magnets. The MIT material acts as an insulator when the temperature is lower than a certain value. Above this temperature, the MIT material becomes a conductor. This transition can be used as a switch between the turns of the 2G HTS magnets. We refer to this temperature-dependent smart switch as "smart insulation." Considering the operating temperature, we selected V2O3 as the material for smart insulation. We have experimentally verified that the advantages of both the insulation magnet (in the superconducting state) and no-insulation magnet (during quenching) can be simultaneously realized.This work was supported by the Korea Electrotechnology Research Institute Primary Research program through the National Research Council of Science and Technology funded by the Ministry of Science, ICT, and Future Planning (17-12-N0101-18). (Corresponding author: Young-Sik Jo.
Agrypnus (Sabikikorius) uidoensis Han and Park, sp. nov.
No full textAgrypnus (Sabikikorius) uidoensis Han and Park, sp. nov. (Figs. 4–35) Specimens examined. Holotype: male, sand dune of Donmok beach on Ui-do Island, Dochoi-myeon, Jeollanam-do, Korea. 21. V. 2008. Hae Chul Park (Paratypes: 8 males and 14 females, same data as for holotype. Holotype and all paratypes deposited in NAAS. Description. Holotype (Figs. 5–6; male) 15.5mm long, 4.5 mm wide; body elongate-oval, parallel-sided, rather convex; color blackish brown, but antennae, maxillary palpi, and legs dusky reddish brown (Figs. 5, 6); two kind of scale liked-hair densely covered, of which reddish brown hairs (rbh) bearing from large punctures and white gray hairs (wgh) bearing from small punctures (Fig. 17). Head (Fig. 9) shallowly impressed at longitudinal median region; carina above antennal socket well ridged, not reaching to frontal margin (Fig. 13); with ‘v’ shaped marking of white gray hairs (wgh) at vertex; eyes almost parallel sided (Fig. 10). Maxillary palpi axed shape (Fig. 14); Antennae short, reaching two-thirds length of pronotum; first antennomere large, stout, 2.46 times longer than wide; second antennomere cylindrical, 1.28 times longer than wide and 1.35 times longer than third one; third antennomere subobconic, 1.32 times longer than wide; fourth antennomere serrated (Fig. 11); 11 th antennomere fusiform, slender, elongated, 1.90 times longer than wide (Fig. 15). Pronotum (Fig. 16) convex, dorsal-lateral portions slightly declivous; 1.07 times longer than wide, widest just before mid-length, but not wider than width of hind angles; longitudinal median furrow distinct beyond middle to posterior; lateral margin slightly arched, gradually narrow to anterior; base of hind angles weakly sinuate; hind angle broad at base, slightly divergent laterally, without carina, truncated at apex (Fig. 18). Prosternum (Fig. 19) convex, sinuate to base of antennal groove; anterior lobe rounded, more long than apex of hypomeron; prosternal process (Fig. 20) horizontal, gradually narrowing to apex, with long pubescence at apex; pronotosternal sutures forming deep groove to keep antennae; hypomeron broad, with distinct and deep groove for reception of fore tarsus, groove not reaching lateral margin, posterior margin almost straight. Scutellum (Fig. 21) subtrapezoidal, flattened, scale - like hairs densely covered, 1.17 times as long as wide; anterior margin parallel, narrower than lateral margins at middle; lateral margins strongly sinuate inwardly at one thirds of anterior; posterior margin rounded. Mesocoxal cavity surrounded by mesosternum and metasternum. Metasternum (Fig. 23) moderately convex at middle, with distinct tarsal grooves reaching to postero-lateral margins. Elytra convex, 2.26 times longer than wide, widest at one third and then gradually convergent to posterior; surface with punctuate striae, striae vestigial and indistinct (Fig. 22); intervals feebly convex. Sternite 7 (Fig. 24) semi-oval, 1.27 times as wide as long. Legs; hind femur as long as hind tibia; posterior half of 1 st to 4 th tarsal segments densely clothed with golden pubescence ventrally; claws simple, with two setae at base. Male genitalia (Fig. 27–29) elongate, rather slender, weakly bent downward at midlength (Fig. 28); median lobe slender, gradually narrow to apex, a little longer than parameres; paramere slender, gradually narrow to apex, slightly sinuate inwardly at middle, with lateral subapical barb expanded triangluarly; lateral subapical barb rather short, 1.36 times longer than wide (Fig. 30), with several long setae on median region ventral, almost parallel-sided at base (Fig. 31). Female (Figs. 7, 8). Length 17.52–19.10 mm, width 5.50–5.65 mm, generally larger than male; Antenna shorter than male, approximately reaching half-length of pronotum, forth antennomere more weakly serrated than male, 1.13–1.16 times as long as wide (Fig. 12); pronotum more convex than male and lateral margin more strongly arched; from posterior half of sternite 6 and sternite 7 with smooth elliptic region on median with small punctures without pubescence (Figs. 25, 26); ovipositor stout, lacking stylus (Fig. 32), weakly bent downwardly near apex in profile (Fig. 33); vagina (Fig. 34) rather short; uterus greatly enlarged, with two colleterial glands; bursa copulatrix (Fig. 35) stout, cylindrical, elongated, spiraled right, including two spiniferous rows, with a pair of small sclerotized plates at base. Larva. Unknown COI profile. We obtained a region data set of 686 nucleotides for five paratypes. No sequence divergence was detected at the infraspecific level. Base frequencies were: A = 27.1 %, C = 25.4 %, G = 18.5 %, and T = 29.0%. 16 S rDNA. We obtained a partial region data set of 965 bases for five paratypes of this novel species. Mean base frequencies were as follows: A = 42.4 %, C = 19.7 %, G = 9.7 %, and T = 28.2 %. Kimura 2 -pairwise divergences within the new species ranged from 0.1 % to 0.5 %. Distribution. Korea (Ui-do Island). Biology. This species remains unknown for detailed biological information. We can only provide brief collecting information that they was caught during the day under some logs and driftage deposited on the beach (Figs. 3, 4). Some individuals were collected by pitfall traps, with each trap containing a small amount of a mixture of 10 volumes of 100 % ethyl alcohol and one volume of pupal broth extracted from Bombyx mori (L.); the traps were left overnight. Etymology. This new species was named A. (S.) uidoensis based on its collection locality, Ui-do Island, Korea. Notes. Within the region including Korea and Japan, this novel species closely resembles A. (S.) ryukyuensis Kishii 1985 from the Ryukyu Islands, Japan, in general appearance and body color. Agrypnus (S.) uidoensis sp. nov. has a distinctly carinate anterior margin of the hypomeral groove for reception of the fore tarsi, the prosternal process is extends straight in the posterior direction, the scutellum is more weakly inwardly concave, especially in male genitalia, the median lobe is slightly longer than the paramere, and the lateral margin of the subapical barb of the paramere is slightly inclined and almost parallel-sided at the base. In contrast, A. (S.) ryukyuensis has indistinct anterior margins of the hypomeral groove, the prosternal process is bent slightly inwardly behind the procoxal cavities, the scutellum is strongly concave inwardly, the median lobe of the male genitalia is equal in length to the paremere apex, and the lateral margin of the subapical barb of the paramere is more strongly inclined and clearly concave at the base. Agrypnus (S.) uidoensis is also separated from A. (S.) taciturnus and A. (S.) sauteri by general body color, the ratio of the length and width of the fourth antennomeres, and the differences in male genital shape as given above in the key. The molecular sequence data set of COI and 16 S rDNA of mtDNA will be useful to search for the unknown larva, which is expected to have same genetic information with adult of this novel species, as well as in determining the relationship between congeners of Sabikikorius and status for further systematic study. FIGURES 9–26. SEM images of A. (S.) uidoensis. 9: Head; 10: Eye in a dorsal view; 11: 2 nd to 4 th antennomeres, male; 12: Ditto, female; 13: Frontal view of the head; 14: Ventral view of the maxillary palpi; 15: 10 th and 11 th antennomeres, male; 16: Pronotum; 17: Hairlike scales on the disk of the pronotum; 18: Hind angle of the pronotum; 19: Ventral view of the prosternum; 20: Prosternal process in a ventral view; 21: Scutellum; 22: Elytral punctuates; 23: Metasternum; 24: 6 th and 7 th sternites, male; 25: Ditto, female; 26: The different puncture shape on the smooth elliptic region, female.Published as part of Han, Tae Man, Sim, Ha Sik, Lee, Seunghwan & Park, Hae Chul, 2009, A new species Agrypnus (Sabikikorius) uidoensis sp. nov. (Coleoptera: Elateridae) from the Sand Dune Shore of Ui-do Island, Korea, pp. 60-68 in Zootaxa 2134 on pages 64-66, DOI: 10.5281/zenodo.27496
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