http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 강호덕 (검색결과 151 건)
- 무료
- 기관 내 무료
- 유료
-
강호덕,황의환,이상래 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.1
Purpose : To observe the histopathological changes in the pulp tissues of mandibular molars in streptozotocininduced diabetic rats after irradiation. Materials and Methods : The male Sprague-Dawley rats weighing approximately 250 gm were divided into four groups: control, diabetes, irradiation, and diabetes-irradiation groups. Diabetes mellitus was induced in the rats by injecting streptozotocin. Rats in control and irradiation groups were injected with citrate buffer only. After 5 days, the head and neck region of the rats in irradiation and diabetes-irradiation groups were irradiated with a single absorbed dose of 10 Gy. All the rats were sacrificed at 3, 7, 14, 21, and 28 days after irradiation. The specimen including the mandibular molars were sectioned and observed using a histopathological method. Results : In the diabetes group, capillary dilatation was observed. However, there was no obvious morphologic alteration of the odontoblasts. In the irradiation group, generalized necrosis of the dental pulp tissues was observed. Vacuolation of the odontoblasts and dilatation of the capillaries were noted in the early experimental phases. In the diabetes-irradiation group, generalized degeneration of the dental pulp tissues was observed. Vacuolation of the dental pulp cells and the odontoblasts was noted in the late experimental phases. Conclusion : This experiment suggests that dilatation of the capillaries in the dental pulp tissues is induced by diabetic state, and generalized degeneration of the dental pulp tissues is induced by irradiation of the diabetic group.
-
-
골결손부 치유과정에서 cone beam형 전산화단층영상의 정확도
강호덕,김규태,최용석,황의환 대한구강악안면방사선학회 2007 Imaging Science in Dentistry Vol.37 No.2
Purpose : To evaluate the accuracy of the imaging reformation of cone beam computed tomography for the assessment of bone defect healing in rat model. Materials and Methods : Sprague-Dawley strain rats weighing about 350 gms were selected. Then critical size bone defects were done at parietal bone with implantation of collagen sponge. The rats were divided into seven groups of 3 days, 1 week, 2 weeks, 3 weeks, 4 weeks, 6 weeks, and 8 weeks. The healing of surgical defect was assessed by multiplanar reconstruction (MPR) images and three-dimensional (3-D) images of cone beam computed tomography, compared with soft X-ray radiograph and histopathologic examination. Results : MPR images and 3-D images showed similar reformation of the healing amount at 3 days, 1 week, 2 weeks, and 8 weeks, however, lower reformation at 3 weeks, 4 weeks, and 6 weeks. According to imaging-based methodologies, MPR image revealed similar reformation of the healing amount than 3-D images compare with soft X-ray image. Among the four threshold values for 3-D images, 400-500 HU revealed similar reformation of the healing amount. Histopathologic examination confirmed the newly formed trabeculation correspond with imagingbased methologies. Conclusion : MPR images revealed higher accuracy of the imaging reformation of cone beam computed tomography and cone beam computed tomography is a clinically useful diagnostic tool for the assessment of bone defect healing.
-
Peace 포플러(Populus koreana X P.trichocarpa)의 줄기형성에 미치는 Thidiazuron 효과
강호덕,이민순,문흥규,박인선 한국식물생명공학회 2004 JOURNAL OF PLANT BIOTECHNOLOGY Vol.31 No.1
Shoot formation was investigated from in vitro cultivation of exotic hybrid poplar (Populus koreana × P. trichocarpa) with a specific stomatal character occurring both upper and lower surface of leaves. Two different explants (stem and leaf segment) of Peace poplar were cultured on half strength Murashige and Skoog (MS) basal medium supplemented with the various concentrations of thidiazuron as a plant growth regulator. Most adventitious shoots were produced from excised ends of stem or mid-veins of leaf segments. The highest average numbers of shoots were 7.1 and 5.3 with the treatments of 0.02 mg/L TDZ in both explants of stem and leaf segment. The highest shooting rates were achieved to 83.3% and 47.6% with the concentrations of 0.01 mg/L and 0.02 mg/L TDZ by axillary bud and leaf cultures, respectively. 기공이 잎의 앞뒤 양면에 존재하는 생리·형태적 특징을 가지고 있는 외래 교잡종인 Peace (Populus koreana×P. trichocarpa) 포플러의 효율적인 기내증식법을 개발하고자 액아와 엽육 절편을 이용하여 기내배양을 실시하였다. 몇 종류의 배 지 시험을 통해 1/2 MS 배지를 적정배지로 선정할 수 있었고, 이 배지에 TDZ를 처리하여 multiple shoot 및 adventitious shoot 유도 효과를 조사하였다. 절간액아 및 엽육을 절편으로 TDZ의 농도별 처리로 배양 2주 후부터 multiple shoot 및 adventitious shoot가 유도되었으며 절편 및 TDZ 처리 농도에 따라 차이를 나타냈다. 액아로부터는 TDZ 처리로 절편당 5-7 개의 multiple shoot가 유도된 반면 엽육 절편에서는 2-5개의 adventitious shoot가 유도되었다. 한편 부정아로부터 정상적인 줄기의 성장에 있어서도 절편에 따른 차이를 나타냈다. 이상 의 결과는 저농도의 TDZ의 처리로 peace 포플러의 액아 혹은 엽육 절편의 기내배양을 통해 대량증식이 가능함을 보여주는 결과이다.
-
-
포플러의 미성숙 배와 캘러스에서 유전자총에 의한 GUS - gene 의 일시적 발현
강호덕,강상구,배한홍,박교수,( Ho Duck Kang,Sang Gu Kang,Han Hong Bae,Kyo Soo Park,Richard B . Hall ) 한국산림과학회 1997 한국산림과학회지 Vol.86 No.3
Excised immature ovules and calli derived from the stems of cottonwood were bombarded with microprojectiles carrying plasmid DNA containing CaMV-35S promoter and β-glucuronidase(GUS) gene. After bombarded, the expression of GUS gene was detected by the assay of 5-bromo-4-chloro-3-indolyl-β-gluconide(X-gluc). Transient gene expression was measured by counting the number of distinct regions of GUS activity per explant. As major parameters, the number of shots and the period of exposure to X-gluc after the bombardment were investigated for detecting GUS gene expression. In this experiment, the percents of GUS gene expression showing spots were 56.8 from immature ovules and 75.9 from micro-calli of cottonwood species. Among the treatments, two consecutive shots and 48 hour exposure produced abet 25.75±2.77(per ovule), 11.43±1.22(per mini petridish) spots, respectively, Microprojectile particle bombardment provides a useful method to assay transient expression in both types of explants. Furthermore, our results represent that the excised ovule and/or the calli might be stably transformed by the biolistics.
-
강호덕,Romika Chandra 한국산림과학회 2016 Forest Science And Technology Vol.12 No.2
The present work aimed to study the physiological effects of mixed heavy metals, cadmium (Cd), copper (Cu), chromium (Cr), and zinc (Zn) in four poplar hybrids. Poplar hybrids were treated once with six different concentrations (0, 5, 50, 100, 200, and 500 ppm) of mixed heavy metals for a period of 3 months. The photosynthetic and transpiration rates were measured before and during treatment using an LCiSD portable photosynthesis system whereas the photosynthetic pigments were analytically determined. According to the results obtained, poplar hybrids exhibited a decrease in chlorophyll content and carotenoids except for hybrid 1 (Eco 28) which showed an increase at 200 and 500 ppm heavy metal concentrations. The photosynthetic rate decreased with increasing heavy metal concentrations; however, an increase was observed at the highest concentration of 500 ppm at 14.54 mmol m ¡2 s ¡1. Transpiration rates were significantly affected by increased heavy metals. Hybrid 1 (Eco 28) was deduced as the hybrid that has the ability to tolerate high levels of mixed heavy metals. Among the four poplar hybrids tested, hybrid 1 (Eco 28) was the best candidate for phytoremediative experiments under greenhouse conditions. These results are valuable in understanding how various tree hybrids respond to mixed heavy metal stress, especially when using them as bio indicators for phytoremediation experiments.
-
강호덕,문흥규,이수광 한국산림과학회 2014 Forest Science And Technology Vol.10 No.4
A somatic embryogenesis and plant regeneration study was conducted with a rare and endangered species, Acanthopanaxseoulenses, and various factors affecting somatic embryo induction were evaluated. The frequency of embryogenic callusinduction was slightly better on wounded seeds compared with non-wounded ones. The optimum medium to inducesomatic embryos (SEs) from embryogenic cells was MS medium supplemented with 3% sucrose and 0.10.2 mg/l abscisicacid (ABA), or MS medium with 3% sucrose and 0.1 mg/l ABAþ0.02% activated charcoal. Gibberellic acid resulted in apositive effect on SE germination, but there were no differences in the range of 0.1 to 1.0 mg/l. SE germination and plantconversion rate were different in the two gelling agents: agar-gelled medium was slightly better than gelite-gelled medium,and the highest plant conversion, 7818.2%, was achieved in agar-gelled medium. Regenerated plantlets weresuccessfully acclimatized in artificial soil mixture, and more than 98% of the plants survived in vermiculite or an equalvolume mixture of vermiculite and peat moss. Results suggest that the rare and endangered species is able to propagateeffectively via the somatic embryogenesis system.
-
-
RISS
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
