• 한국산림과학회지
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• 제51권1호
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• pp.1-21
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• 1981

자연잡종(自然雑種)으로 알려진 Populus glandulosa와, P. tomentiglandulosa에 대(対)하여 그의 잡종성(雑種性)과 분류학적(分類學的) 위치(位置)를 구명(究明)하기 위(為)하여, 형태(形態), 생리(生理), 및 핵학적(核學的)인 조사(調査)를 하여 다음과 같은 결과(結果)를 얻었다. 1. 접(接), 삽목(揷木)의 활착력(活着力)은 잡종간(雑種間)에 차이(差異)있고, 삽목발근력(揷木発根力)은 불완전(不完全) 우성(優性)이다. 2. 개엽성(開葉性)은 부완전(不完全) 우성(優性)이고 착엽성(着葉性)은 P. alba ${\times}$ glandulosa와 P. tomentiglandulosa가 강(強)하다. 3. $KClO_3$에 대(対)한 항독성(抗毒性)은 잡종간(雑種間)에 차(差)가 있다. 4. 엽(葉)의 많은 외부(外部) 형질(形質)들은 불완전(不完全) 우성(優性)이고, P. tomentiglanaulosa는 P. alba ${\times}$ glanaulosa와, 그리고, P. glandulosa는 P. davidiana와 P. alba와의 정(正), 역(逆) 또는 back cross hybrid와 유사(類似)하다. 5. 웅화수(雄花数)는 불완전(不完全) 우성(優性) 또는 잡종강세(雑種強勢) 현상(現象)을 하고, P. tomentiglandulosa는 P. alba ${\times}$ glandulosa와 그리고, P. glandulosa는 P. alba ${\times}$ davidiana 또는 P. davidiana ${\times}$ alba와 수(数)가 근사(近似)하다. 6. male catkin의 포(苞)의 형태(形態)와 대색(帶色)은 불완전(不完全) 우성(優性)이고, P. glandulosa는 P. alba ${\times}$ davidiana에, 그리고 P. tomentiglandulosa는 P. alba ${\times}$ glandulosa와 유사(類似)하다. 7. 엽병(葉炳)의 유관속(維管束)의 수(数)와 배열형(配列型)은 잡종간(雑種間)에 차이(差異)가 있고 잡종(雑種)들은 복잡(複雜)한 형(型)을 하고 있다. 8. 유경(幼莖)의 해부학적(解剖學的) 성질(性質)은 잡종간(雑種間)에 차(差)가 없으나, 목섬유(木纖維)의 크기는 차(差)가 있다. 9. metaphase I과 II에 있어, 인공(人工) 잡종(雑種)과 P. glandulosa 또는 P. tomentiglandulosa는 염색체(染色體) 행동(行動)이 불규칙(不規則)하였다. 10. metaphase I에서 잡종(雑種)과 P. glandulosa 그리고 P. tomentiglandulosa는 19II의 핵판(核板)이 적고, 일가(一価) 염색체(染色体)가 다수(多数) 출현(出現)한다. 11. anaphase I과 II에 있어, laggard chromosome과 chromosome bridge가 있는 이상핵판(異常核板)이 잡종(雑種)과 P. glandulosa 그리고 P. tomentiglandulosa에서 다수(多数)히 출현(出現)하였다. 12. pollen tetrad와 임성화분(稔性花紛)의 출현율(出現率)이 잡종(雑種)과 P. glanaulosa, 그리고, P. tomentiglandulosa에서 낮았다.

• Journal of Applied Biological Chemistry
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• 제66권
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• pp.408-415
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• 2023

Alzheimer's disease constitutes a large proportion of all neurodegenerative diseases and is mainly caused by excess aggregation of amyloid beta (Aβ), which results in oxidative stress, inflammation, and apoptosis in the neurons. Populus tomentiglandulosa belongs to the Salicaceae family and is widely distributed in Korea; the antioxidant activities of the extract and fractions from P. tomentiglandulosa have been demonstrated in previous studies. Specifically, the ethyl acetate (EtOAc) fraction of P. tomentiglandulosa (EtOAc-PT) shows the most powerful antioxidative activity. Therefore, the present study investigates the protective effects of EtOAc-PT against neuronal damage in Aβ_25-35-stimulated SH-SY5Y cells. EtOAc-PT restored cell viability significantly as well as inhibited the levels of reactive oxygen species and lactate dehydrogenase release compared to the Aβ_25-35-induced control group. Furthermore, the inflammation- and apoptosis-related protein expressions were investigated to demonstrate its neuroprotective mechanism. EtOAc-PT downmodulated the expressions of inducible nitric oxide synthase, cyclooxygenase-2, B-cell lymphoma 2 associated X, and B-cell lymphoma 2. Thus, the findings show that EtOAc-PT has protective effects against Aβ_25-35 by suppressing oxidative stress, inflammation, and apoptosis.

• 한국가구학회지
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• 제18권2호
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• pp.147-151
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• 2007

This report explains the intervessel pit dimension of Populus tomentiglandulosa and its role in embolism repair according to proposed mechanism by Zwieniecki and Holbrook, 2000. It was found that mean contact angle ( ) of water droplets on the inner surface of vessels was $56^{\circ}$. Openings into the bordered pits were typically elliptical. The angle of the bordered pit chamber ($2{\alpha}$) was found $142.17^{\circ}$. From the capillary equation $Pmax\;=\;Gcos\;(\;+{\alpha})$, it was found that mathematically the maximum pressure 0.08MPa created by pits, can be employed to force the air within the embolized vessel into solution.

• 한국가구학회지
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• 제18권2호
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• pp.161-165
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• 2007

An experiment was conducted to observe the safranine flow depth in longitudinal direction of Populus tomentiglandulosa. Longitudinal flow of safranine was considered from bottom to top end of the tree. Vessel and wood fiber were considered for the measurement of safranine flow depth. It was found that sapwood conducted safranine 12.25% higher in longitudinal direction compared with heartwood. Vessel was found the main avenue for safranine flow. Vessel conducted safranine 41.94% higher than that of wood fiber. Safranine penetrated through vessel and fiber forming a curved meniscus.

• 한국가구학회지
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• 제17권3호
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• pp.29-36
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• 2006

Juvenile and matured wood of Populus tomentiglandulosa species of Salicaceae native grown in Korea was observed by FE-SEM and optical microscope. Species is characterized by mostly diffuse-porous, simple perforation plates, polygonal alternate non-vestured intervessel pit, medium length of vessel elements and fibres, non-septate very thin walled libriform fibres and exclusively uniseriate procumbent rays. Axial parenchyma was absent or extremely rare. Vessel and fibre length were longer in both matured and juvenile latewood than those of earlywood. Ray cell lumen diameter, ray length, number and diameter of endwall pit in ray cell, endwall pit, number and diameter of pit in lateral wall of one ray parenchyma cell, vessel ray pit number and diameter vary from juvenile early and latewood to matured wood.

• 한국가구학회지
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• 제16권2호
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• pp.77-83
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• 2005

The specific gravity of wood treated with the essential oil penetration was higher than that of untreated wood. However, in case of oven-dried wood the difference of treated and untreated products decreased, compared with air-dried wood. The shrinkage of treated wood showed no consistent trend and the difference was trivial. In addition, similar trend was shown in each direction. Compression strength parallel to grain of treated wood was somewhat higher than that of untreated wood and the difference was trivial. The difference in static bending strength was slight and showed no consistent trend. The stage of check for Pinus koraiensis and Populus tomentiglandulosa and Alnus hirsuta was 2 stage and 3 stage, respectively. Deformation stage with no relation to the essential oil treatment was 1 stage for Pinus koraiensis, 2 stage Populus tomentiglandulosa and 3 stage for Ainus hirsuta, respectively, and there was no difference in essential oil penetration.

• 한국가구학회지
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• 제18권3호
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• pp.243-247
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• 2007

An experiment was conducted to observe the safranine penetration depth in radial directions of Populus tomentiglandulosa. Radial penetration was considered from bark to pith. In radial direction, ray parenchyma and intercellular space were considered for the measurement of safranine penetration depth. It was found that sapwood conducted safranine 24.23% higher in radial direction compared with heartwood. Intercellular space conducted safranine 39.27% higher depth compared with ray parenchyma and the penetration depth was 39.41% higher in sapwood compared to heartwood. During safranine penetration, it formed a curvature in the lumen of ray parenchyma. Initially safranine penetration was found high and decreased gradually.

• 한국가구학회지
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• 제22권3호
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• pp.199-207
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• 2011

Examined the color of ten species of Korean broadleaf trees were experimented based on $L^*a^*b^*$ values and color difference (${\Delta}E^*ab$) between sapwood and heartwood, in order to analyze and determine the color, a critical visual and decorative factor of the broadleaf trees that can be used for making woodcraft and furniture. According to the result, the entire sapwood and heartwood, except the heartwood of Populus tomentiglandulosa, showed positive value in whiteness, redness, and yellowness and therefore contained yellow and red. None of the species showed color difference between sapwood and heartwood that was trace (0~0.5), slight (0.6~1.5), or very much; whereas Populus maximowiczii showed noticeable color difference (1.5~3.0); Salix koreensis, Betula platyphylla var japonica, Carpinus laxiflora, and Castanea crenata, appreciable and Populus tomentiglandulosa, Juglans mandshurica, Betula schmidtii, Alnus japonica, and Quercus variabilis, much. The color characteristics of heartwood and sapwood of the ten Korean broadleaf tree species studied in this research can be used as basic data for woodcraft or furniture production, especially when replacing foreign woods with Korean ones, and also contribute to convergence researches for science, engineering, and design fields.

• Journal of Applied Biological Chemistry
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• 제63권4호
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• pp.357-363
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• 2020

Oxidative stress caused by the overproduction of reactive oxygen species (ROS) is known as an etiology of neurodegenerative diseases. Populus tomentiglandulosa (PT), a member of the Salicaceae family, is widely grown in Korea and has been reported to exert protective effects on cerebral ischemia by attenuating of oxidative stress and neuronal damage. In the present study, we investigated the antioxidant activity and neuroprotective effects of an ethanol extract and four fractions [n-butanol, ethyl acetate (EtOAc), chloroform, and n-hexane] of PT under in vitro and cellular systems. The extract and four fractions of PT showed 1,1-diphenyl-2-picrylhydrazyl (DPPH), •OH, and O2- radical scavenging activities in a dose-dependent manner. In particular, the EtOAc fraction of PT had the strongest DPPH, •OH, and O2- radical scavenging activities among the extract and other fractions. Therefore, we further investigated the neuroprotective effect of the EtOAc fraction of PT against oxidative stress in H2O2-induced SH-SY5Y cells. Treatment with H2O2 significantly decreased cell viability and lactate dehydrogenase (LDH) release, and it also increased the ROS levels compared to the normal group. However, treatment with the EtOAc fraction of PT significantly increased cell viability. Moreover, the EtOAc fraction of PT-treated group significantly suppressed ROS production and LDH release compared to the H2O2-induced control group. In conclusion, our findings indicated that PT had in vitro antioxidant activity and neuroprotective effects against oxidative stress. Therefore, PT could be used as a natural agent for protection against oxidative stress.

• Journal of Forest and Environmental Science
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• 제9권1호
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• pp.67-80
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• 1993

무공해 대체 펄프화법 개발의 일환으로 비교척 최근에 많은 연구가 이루어지고 있는 아세트산-물 용매 증해법을 이용하여 현사시나무와 소나무률 펄프화 하였다. 펄프 특성의 변화에서 현사시나무는 거의 모든 아세트산 충해초건에서 우수한 펄프화 경향을 보였지만 소나무는 저온에서 충해가 거의 일어나지 않았다. 현사시나무의 최적 중해조건은 중해농도 95%, 중해온도 $185^{\circ}C$, 증해시간 0.5hr이었다. 구성당 성분의 거동은 현사시나무와 소나무에서 glucose만이 소량 감소하는 반면 그외의 당성분들은 다량 용출되었다. 폐액중의 용출 아세트산 리그닌에 대한 기초척인 성질을 살펴본 결과 현사시나무의 아세트산 리그닌의 원소조성은 C가 63.88%, H가 5.45%, O가 30.67%이며 $C_9$의 formular는 $C_9H_{9.15}O_{3.24}$였고 소나무의 아세트산 리그닌의 조성온 C가 61.85%, H가 6.14%, O가 32.01% 이며 $C_9$의 formular는 $C_9H_{9.15}O_{3.50}$이었으며 두 수종의 아세트산 리그닌 중합 명균분자량은 현사시나무가 731이며 소나무는 725였다.