• 한국가금학회지
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• 제49권1호
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• pp.15-23
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• 2022

본 연구는 국내 토착화된 닭 12개 품종(재래종 5계통, 한국형 로드종 2계통, 한국형 레그혼종 2계통, 한국형 코니시종 2계통 및 한국오계)의 생리적 활성 정도를 비교하고 자품종 간 텔로미어 길이 및 생존 능력을 분석하였다. 분석에 총 466수를 공시하고 텔로미어 길이는 양적 형광접합보인법을 이용하여 각 개체의 백혈구 세포 내 telomeric DNA의 상대적 함량을 분석하였다. 각 품종의 생존 능력은 발생 후부터 50주령까지의 생존율로 분석하였다. 분석 결과, 모든 품종에서 공히 연령이 증가함에 따라 텔로미어 길이의 선형적 감소를 나타내었고, 품종 간 텔로미어 길이는 20주령 이후부터 유의한 차이를 보이고 동일 기간에 텔로미어 길이의 단축율에도 차이가 있는 것으로 나타났다(P<0.01). 품종 간에 있어서는 한국형 로드-D종이 가장 긴 텔로미어 길이와 가장 낮은 텔로미어 단축율을 보였고, 반면 한국형 코니시 갈색종은 가장 짧은 텔로미어 길이와 가장 높은 단축율을 나타내었다. 텔로미어의 단축 정도는 50주령 텔로미어 길이는 8주령 길이의 절반 정도에 불과한 것으로 나타났다. 생존율에서도 품종 간 유의한 차이를 보이며 한국형 로드종과 오계가 상대적으로 높은 생존율을 보이고, 한국형 코니시종이 가장 저조한 생존율을 나타내었다. 생존율과 텔로미어길이 간에는 유의한 정(+)의 상관을 보이고 성장 초기보다는 노년의 텔로미어 길이가 생존율과 더 높은 상관관계를 나타내었다. 따라서 특정 시기의 텔로미어 길이보다는 일정기간 동안 텔로미어 길이의 단축율이 생존율과 더욱 밀접한 관련이 있는 것으로 사료된다. 이상의 텔로미어 역동성과 생존 능력 분석 결과를 바탕으로 토종닭 품종 중 한국형 로드종의 생리활성도가 가장 높고, 한국형 코니시종의 생리활성도가 가장 낮다고 판단된다.

• 한국산림과학회지
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• 제109권4호
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• pp.413-420
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• 2020

본 연구는 체세포배 발아 식물체의 세포 라인별, 순화용 기질별 생육 특성을 분석하여, 일본잎갈나무 조직 배양묘의 순화 중 생존율을 높이려는 방안을 마련하고자 실시하였다. 체세포배 발아 식물체는 라인 L14-66, L16-18, L17-B4를 사용하였으며, 순화용 기질은 낙엽송 전용 상토, 원예용 상토, 엘리포트, 피트플러그를 사용하였다. 평균 초기 신초와 뿌리 길이는 L14-66 라인이 가장 짧았고, L17-B4 라인이 가장 길었다. 세포 라인별 평균 생존율은 L17-B4 라인이 87.0%로 가장 높았고, L14-66 라인이 64.3%로 가장 낮았다. 순화용 기질별 생존율은 엘리포트와 피트플러그에서 각각 88.5%, 88.9%로 가장 높았다. L14-66 라인의 초기 신초 길이는 낙엽송 전용 상토(r = 0.852), 원예용 상토(r = 0.692), 엘리포트(r = 0.867)에서 생존율과 상관이 높았으나, 전 질소 함량이 높은 피트플러그에서는 상관이 없었다. L17-B4 라인의 초기 신초 길이는 모든 순화용 기질에서 생존율과 상관이 없었다. L14-66 라인의 초기 뿌리 길이는 낙엽송 전용 상토(r = 0.986), 엘리포트(r = 0.846), 피트플러그(r = 0.802)에서 생존율과 상관이 높았으며, 유식물체의 생존율은 초기 뿌리 길이가 길수록 높았다. L17-B4 라인의 초기 뿌리 길이는 낙엽송 전용 상토(r = 0.896)와 엘리포트(r = 0.696)에서만 생존율과 상관을 보였다. 결론적으로, 유식물체의 생존율을 높이기 위해서 신초 길이보다 뿌리 길이를 우선 고려해야 하며, 피트플러그와 같이 기질 내 질소 함량이 높은 재료를 사용하거나 순화 과정 중에 질소 시비를 높여 주는 것이 좋다. 또한, 생존율을 높이기 위해 초기 생장이 빠른 라인 개발도 함께 이루어져야 한다.

• 대한치과의사협회지
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• 제47권12호
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• pp.823-829
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• 2009

Purpose : The aim of this study was to evaluate the survival rate of sintered porous-surfaced implants placed in the edentulous posterior mandibles, in relation to implant length and diameter, crown-to-implant ratio, and types of prostheses, for a maximum of eight years of functioning. Material and Methods : The study group consisted of 43 partially edentulous patients who visited Catholic University Hospital of Daegu and one private dental clinic. A total of 122 sintered porous-surfaced implants n $Endopore^{(R)}$ (Inn ova Life Sciences, Toronto, Ontario, Canada) -- were placed in the edentulous posterior mandibles, Two diameter sizes (4.1 mm and 5.0 mm) and four lengths (5.0 mm, 7.0 mm, 9.0 mm, and 12.0 mm) were used. One hundred and three implants were splinted and 21 implants were nonsplinted. The survival rates of the implants in relation to length, diameter, crown-to-implant ratio, and types of prostheses were investigated. Statistical data were analyzed using SPSS Win.Ver 14.0 software with the Chi-square test. Results : The survival rate of the 4.1mm diameter implants was 100% and 91.2% for the 5.0mm diameter implants. The survival rates of the implants of differing diameters were found to be statistically different (p=0.005). The survival rates of both the 5.0mm and 7.0 mm length implants were 100%. The survival rate of the 9.0mm length implants was 97.9% and for the 12.0mm length implants was 95.1%. There was no statistical difference in survival rates for the differing lengths of implants. Of the 103 prostheses that were splinted, the survival rate was 98.0%. The survival rate of splinted prostheses was higher than that of the non-splinted prostheses, but was found to be not statistically different. There were no failed cases when the crown-to-implant ratio was under 1.0. When the crown-to-implant ratio was between 1.0 and 1.5, the failure rate of the implants was 6.7%. No failure was recorded with the ratio range of 1.5 to 2.0. Relative to the crown-to-implant ratio of 1.0, the failure rates were statistically different (p=0.048). Discussion and Conclusion : The cumulative survival rate of the porous-surfaced implants placed in the edentulous posterior mandibles was 97.5%. Short porous-surfaced implants showed satisfactory results after a maximum of nine years of functioning in the edentulous posterior mandibles.

• 대한안전경영과학회지
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• 제11권4호
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• pp.261-267
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• 2009

The purposes of this article is to analyse how market competition of credit card company affect price(interest rate) and survival length of card users. This paper uses individual account data from a large Korean credit card company during the periods from 2002 to 2006. The findings of our study are as follows. First, market competition of credit card company have a negative effect with interest rate of credit card. Second, market competition of credit card company have a affirmative effect with survival length. Finally, The effect of Increasing delinquency rate due to price increase is smaller than decreasing delinquency rate due to extending survival length.

• The Journal of Advanced Prosthodontics
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• 제10권3호
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• pp.191-196
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• 2018

PURPOSE. The goal of this study was to evaluate the clinical outcome of single short implants, less than 8 mm in length, placed in the posterior area. MATERIALS AND METHODS. A total of 128 patients (75 male and 53 female, mean age: $52.6{\pm}11.2years$) with 154 implants participated. Implant marginal bone loss, and survival and success rates were measured. RESULTS. The mean follow-up period was $51.35{\pm}24.97months$. A total of 128 implants, 8 mm in length, were placed in patients who had mean marginal bone loss of 0.75 mm. These implants had a survival rate of 95.3%. Twenty-six implants, 7 mm in length, were placed in areas with a mean marginal bone loss of 0.78 mm and had a survival rate of 96.2%. Both marginal bone loss and survival rate were not statistically different among the groups. In the maxilla, 34 implants showed a mean marginal bone loss of 0.77 mm and a survival rate of 97.1%. In the mandible, 120 implants showed a mean marginal bone loss of 0.75 mm and a survival rate of 95.0%. The average marginal bone loss around all implants was $0.76{\pm}0.27mm$ at the last follow-up review after functional loading. The survival rate was 95.6% and success rate was 93.5%. CONCLUSION. In our study, single short implants less than 8 mm in length in the posterior areas had favorable clinical outcomes.

• Asian Pacific Journal of Cancer Prevention
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• 제17권sup3호
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• pp.305-309
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• 2016

PTEN protein is an important tumour suppressor factor detectable by immunohistochemistry. The goal of the present study was to investigate the prognostic role of PTEN gene expression focusing on length of survival in breast cancer patients. This descriptive-analytical study was conducted on 100 breast cancer cases referred to Sabzevar hospitals in the north east of Iran between 2010 and 2011, followed up to 2015. The PTEN gene expression of tumour tissue samples was determined using specific monoclonal antibodies. The data were analyzed using Chi-square test and Fisher's exact test. Patient length of survival was analyzed after 4 years of follow-up using the Cox regression model. The PTEN gene was expressed in 70 of 100 samples, while being found at a high level in all noncancerous samples. There was an inverse significant relationship between expression of PTEN and tumour stage and grade (p<0.001). In addition, expression of PTEN in invasive ductal tumours was less than in non-invasive tumours. There was also an inverse significant relationship between the likelihood of death and PTEN gene expression (p<0.01). These findings indicate that lack of PTEN gene expression can be sign for a worse prognosis and poor survival in breast cancer.

• 한국패류학회지
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• 제19권1호
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• pp.25-32
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• 2003

To know the effects of the red tide and toxic dinoflagellates on survival and growth of larvae of the mussel, Mytilus galloprovincialis, laboratory experiments were conducted by incubating larvae with either unialgal culture of 4 dinoflagellate species (Amphidinium carterae, Prorocentrum triestinum, Gymnodinium impudicum, or Akashiwo sanguinea) or a standard food (Isochrysis galbana) for 10 days. The survival of larvae was higher than 80% when the food was A. carterae, G. impudicum, or A. sanguinea. The lowest survival (20%) was found when the food was P. triestinum. When the food was P. triestinum, the survival of larvae rapidly decreased from 87% at day 4 down to ca. 50% at day 6, and 20% at day 10. This implies that the larval population of M. galloprovincialis can seriously be affected if they are exposed to the red tide water dominated by P. triestinum for more than 4 days. Shell length of larvae either increased or decreased according to the food species. When the food was A. carterae, G. impudicum, or A. sanguinea, shell length of larvae increased. But, it decreased when the food was P. triestinum. Though shell length increased in 3 treatments, the daily increments (0.63 $\mu$ m for A. carterae, 0.46 m for $\mu$ G. impudicum, and 1.10 m for $\mu$ A. sanguinea) were smaller than that of the standard food (3.79 m for $\mu$ I. galbana). Correlation analyses chowed that the change in shell length was not significant when the food was A. carterae or G. impudicum. Therefore, all of 4 dinoflagellates affected the growth of M. galloprovincialis larvae: growth was negative for P. triestinum, nil for A. carterae and G. impudicum, and positive but lower than standard food for A. sanguinea. These imply that the dinoflagellates are less valuable as foods for M. galloprovincialis larvae. So, decreased growth rate of larvae is expected during red tides, which will consequently cause delayed metamorphosis or failure to recruitment to the adult populations. In considering the harmful effects of red tides on the aquatic ecosystem, not only the effects on adult populations of fish and shellfish, but also the effects on larval populations should be included.

• The Journal of Advanced Prosthodontics
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• 제3권4호
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• pp.204-215
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• 2011

PURPOSE. The aim of this retrospective study is to analyze the relationship between local factors and survival rate of dental implant which had been installed and restored in Seoul Veterans Hospital dental center for past 10 years. And when the relationship is found out, it could be helpful to predict the prognosis of dental implants. MATERIALS AND METHODS. A retrospective study of patients receiving root-shaped screw-type dental implants placed from January 2000 to December 2009 was conducted. 6385 implants were placed in 3755 patients. The following data were collected from the dental records and radiographs: patient's age, gender, implant type and surface, length, diameter, location of implant placement, bone quality, prosthesis type. The correlations between these data and survival rate were analyzed. Statistical analysis was performed with the use of Kaplan-Meier analysis, Chi-square test and odds ratio. RESULTS. In all, 6385 implants were placed in 3755 patients (3120 male, 635 female; mean age $65{\pm}10.58$ years). 108 implants failed and the cumulative survival rate was 96.33%. There were significant differences in age, implant type and surface, length, location and prosthesis type (P<.05). No significant differences were found in relation to the following factors: gender, diameter and bone quality (P>.05). CONCLUSION. Related factors such as age, implant type, length, location and prosthesis type had a significant effect on the implant survival.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제35권3호
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• pp.170-175
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• 2009

Purpose : The purpose of this study is to evaluate 7-year survival rate of implants placed without bone graft in posterior maxilla and compare the survival rate by the age and gender of patient, length and diameter of implant, region of implant placement, bicortical engagement of fixture, and connection of prosthesis. Material and methods : 78 patients (170 implants) who visited our institution from 2002 to 2007 and were followed up with panoramic view and medical records. Kaplan-Meier survival analysis and Log Rank (Mantel-Cox) test were used. Results and conclusions : A 7-year cumulative survival rate for implants placed in posterior maxilla without sinus graft was 95.3%. The survival rate in men was 91.8%, significantly lower than 98.8% in woman.(p<0.05). However, the survival rate by the length of the implants did not show any significant differences.(p>0.05), while the wide platform implant resulted in 85% survival rate which was statistically lower than 98.5% in regular platform. The posterior maxillary implants engaged bicortically showed 97.6% of 7-year Survival rate, comparing 88.6% in not engaged implants. The survival rate of the single implant was 91.2%, while 98.5% in splinted prosthesis. Therefore, the bicortical engagement of the fixtures and splinted prosthesis may be recommended to get a long-term survival rate in posterior maxilla.

• Asian Pacific Journal of Cancer Prevention
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• 제15권2호
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• pp.691-694
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• 2014

Background: Tumor length in patients with esophageal cancer (EC) has recently received great attention. However, its prognostic role for EC is controversial. The purpose of our study was to characterize the prognostic value of tumor length in EC patients and offer the optimum cut-off point of tumor length by reliable statistical methods. Materials and Methods: A retrospective analysis was conducted on 71 consecutive patients with EC who underwent surgery. ROC curve analysis was used to determine the optimal cut-off point for tumor length, measured with a handheld ruler after formalin fixation. Correlations between tumor length and other factors were surveyed, and overall survival (OS) rates were compared between the two groups. Potential prognostic factors were evaluated by univariate Kaplan-Meier survival analysis. A P value less than 0.05 was considered significant. Results: There were a total of 71 patients, with a male/female divide of 43/28 and a median age of 59. Characteristics were as follows: squamous/adenocarcinoma, 65/6; median tumor length, 4 (0.9-10); cut-off point for tumor length, 4cm. Univariate analysis prognostic factors were tumor length and modality of therapy. One, three and five year OS rates were 84, 43 and 43% for tumors with ${\leq}4cm$ length, whereas the rates were 75, 9 and 0% for tumors >4 cm. There was a significant association between tumor length and age, sex, weight loss, tumor site, histology, T and N scores, differentiation, stage, modality of therapy and longitudinal margin involvement. Conclusions: Future studies for modification of the EC staging system might consider tumor length too as it is an important prognostic factor. Further assessment with larger prospective datasets and practical methods (such as endoscopy) is needed to establish an optimal cut-off point for tumor length.