To develop mushroom varieties for cultivating at low temperature on oak logs, a strain with a low fruiting body generation temperature was crossed with Di-mon to select for a line with excellent properties. Selection was followed by cultivation testing. From these studies, Heunghwa 1ho was identified. The optimum temperature for cultivating Heunghwa 1ho, was 13.3oC. The fruiting temperature range was 6.4~20.2oC, identical to that of the parent strain. Growth at 25oC for 7 days achieved optimal mycelial growth of 61.9±2.10 mm, superior to growth of the parent strain at this temperature. The cap shape of Heunghwa 1ho was convex, cap diameter was 57.8±8.31 mm, and cap color was brown. Heunghwa 1ho showed similar genetic traits to those of the parental strain. However, dry weight (20.1 kg/m3) and cap diameter and color are superior to those of the parent strain. The 3 year fresh oak mushroom yield was 113.8 kg/m3, superior to the respective yields of the parent strains JMI 10047 and JMI 90021 (92.5 kg/m3 and 66.4 kg/m3).
In order to provide basic data for preparing management standards and to verify the safety of the Chinese oak mushroom-derived moisturizing medium—which is synthesized and imported in large quantities—the presence of 321 residual pesticides, 7 heavy metals, and 3 radioactive materials was analyzed in the moisturizer samples. Examination of residual pesticides in seven moisturizing medium samples prepared using the Chinese oak mushroom and three domestic sawdust samples used for mushroom culture revealed the presence of cypermethrin and iprodione in three moisturizer samples, but the contents of these pesticides were below the standard limits. Zn was detected in ten samples, Cu was detected in nine samples, and Ni was detected in four samples, but their contents were below the standard limits. Pb, Cd, Cr, and Hg were not detected in any sample. No radioactive materials were detected in the samples. In addition, fruiting bodies of the oak mushroom were observed in each medium. Examination did not reveal the presence of any residual pesticides or harmful compounds. In this study, the use of the moisturizing medium prepared using the Chinese oak mushroom was found to be safe. As residual pesticides, heavy metals, and radioactivity—even in trace amounts—remain concentrated in the human body, continuous verification of the safety of hazardous substances and pollutants during the systematic cultivation and management of these mushrooms is required.
본 연구에서는 원목재배용 표고(Lentinula edodes) 국산 품종에 대한 장흥지역에서 적합한 표고품종 선발을 위해 국내산 총 5개(천백고, 수향고, 백화향, 풍년고, 산조303호) 품종과 일본산 2개(모리290, 모리유지로) 품종을 선택하여 적합품종 선발을 위해 재배시험을 실시하였다. 생산량 조사결과 산조303호가 40.9 kg으로 모리290 39.2 kg, 모리유지로 37.7 kg 보다 우수한 생산량을 보였다. 표고의 품질은 백화향이 갓이 반구형으로 형태가 우수하였으며, 화고형으로 발생하는 특징을 가진 것으로 확인되었다. 기존 재배중인 일본산 품종과 발생특성이 유사하며 생산량이 우수한 산조303호와 고품질의 표고를 생산하는데 유리한 백화향이 장흥지역에서 적합한 국산 표고품종으로 선발하였다.
본 연구를 통해 국내 주요 한약재인 복령의 유해물질에 대한 안전성 확립과 허용기준치 설정의 기초자료를 제공하고자 한다. 국내 유통 중인 복령 10건(국내산 5건, 중국 산 5건)에 대한 잔류농약(321종), 중금속(7종), 방사능(3종), 회분 함량을 분석하였다. 잔류농약은 국내산 1건에서만 농약 성분인 cypermethrin 0.03mg/kg이 검출되었으나 기준치 이하로 나타났다. cypermethrin은 과수 및 원예농업에서 해충 방제의 살 충제로 사용되는 성분이다. 중금속은 Hg를 제외한 Zn, Pb, Ni, Cu, Hg, Cr가 모든 시료에서 검출됐지만 기준치 이하로 나타났다. Cd는 중국산 1건에서 0.011 mg/kg이 검출되었다. 방사능 농도도 모든 시료에서 MDA값 이하로 나타나 불검출 수준이었으며, 회분 함량도 모든 시료에서 기준치인 1.0% 이하로 나타났다. 이번 조사에서 국내에 유통 중인 복령의 유해물질에 대한 위해성은 안전하게 나타났다. 일반적으로 버섯류는 중금속 함량이 높다고 알려져 있다. 복령은 토양 속에서 생장하는 재배 특성상 유해물질에 항시 노출되어 있으므로 재배, 저장, 유통 등 생산단계 전반에 대한 지속적인 모니터링과 체계적인 관리기준 설정이 필요할 것으로 보인다.
We investigated the current status of institutional review boards (IRBs) that oversee research in dental hospitals. Eight hospitals, all of which had IRB, responded to our e-mail. The questions comprised two topics: IRBs and the clinical trials approved by them. The results showed that the average number of staff on IRBs of the 8 hospitals was 12.5. Furthermore, the proportion of dentists was the highest among the science committee members, with an average of 7.75, and the average number of non-dentists among the non-scientific members was 1.8. Regular IRBs convened meetings more than once a month, over the past year, or only if necessary.According to the approval status of clinical trials from 2016 to 2019, less than 50 studies accounted for 75%. The materials related to dental-implant procedures accounted for the highest quantity of materials used during clinical trials at 33.3%. The duration of 50% of the clinical trials ranged from more than 1 year to less than 2 years.Thus, based on the hypothesis that institutional reviews are currently conducted at dental hospitals and have raised issues and suggested improvements, we believe that IRBs will play an important role in dental hospitals, with more research conducted in dentistry in the future.