• Journal of Plant Biology
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• v.26 no.4
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• pp.207-216
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• 1983

Mature embryo and developing seedlings of Ginkgo biloba L. were embedded in a paraplast and serially sectioned at 10${\mu}{\textrm}{m}$ to examine vascular differentiation and vascular transition. Procambium and protophloem formed a continuous system along the epicotylhypocotyl root axis and cotyledons in mature embryo, whereas protoxylem was differentiated discontinuously in the cotyledons and rarely in the upper hypocotyl. The traces of the first and second leaf primordia apeared almost at the same time oppositely to each otehr at the epicotyl and alternately with the cotyledon traces in the upper hypocotyl. The trace differentiated bidirectionally toward the epicotyl and root tips. the young root initially formed a diarch xylem. Then, as the traces of the first and second leaves were superimposed, the diarch xylem. Then, as the traces of the first and second leaves were superimposed, the diarch xylem of the root was changed totriarch and tetrarch xylem, respectively. On the formation of primary vascular system of Ginkgo biloba, it is suggested that the primary phloem forms a continuous system throughout the seedling, whereas the primary xylem of the epicotyl is formed independently from that of the root-hypocotyl cotyledon system.

• Korean Journal of Food Science and Technology
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• v.54 no.4
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• pp.403-413
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• 2022

Evidence regarding the efficacy of Ginkgo biloba extract on cognitive function has been contentious. This study evaluated the effective period of G. biloba intake to improve cognition in the elderly. PubMed, EMBASE, Cochrane, Web of Science, and PsycArticles databases were searched for short-listing relevant studies. Twenty-five studies fulfilled the inclusion criteria. Cognitive efficacy was assessed based on the duration of intervention. G. biloba intake for 3-6 months statistically significantly affected cognitive function (SMD= -0.21; 95% CI -0.39, -0.03; p=0.02). However, the improvement in activities of daily living (ADLs) was not statistically significant. Thus, G. biloba intake for more than three months improves cognition in the elderly people with cognitive impairment and AD dementia without any safety risk. Intake for up to six months does not improve ADLs significantly in mild to moderate dementia patients.

• Food Science and Preservation
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• v.17 no.3
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• pp.376-383
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• 2010

Including crude fat content, triacylglycerol species, tocopherols and phytosterols were analyzed in 8 kinds of nuts (sunflower seed, cashew nut, walnut, pistachio, pumpkin seed, ginkgo, hazel nut and pecan). The extracted crude fats showed 0.63~39.60 wt%, among which hazel nut showed the highest amount of fat content. Oleic acid (C18:1) was major fatty acids at sn-2 position in cashew nut, pistachio, hazel nut, and pecan while sunflower seed, walnut, and pumpkin seed showed linoleic acid (C18:2) as a major fatty acids at sn-2 position. Especially, ginkgo contained 10.72 wt% of vaccenic acid (C18:1-n7) at sn-2 position. The TAG species of 8 kinds of nuts were analyzed by reverse-phase HPLC, from which PN value ranged 40~52. Among the analyzed nuts, higher content of tocopherols were observed in ginkgo (48.57 mg/100 g), sunflower seed (38.35 mg/100 g), and pumpkin seed(31.43 mg/100 g). Total phytosterols were observed with the range of 88.60~947.20 mg/100 g.

• Asian-Australasian Journal of Animal Sciences
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• v.26 no.4
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• pp.517-522
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• 2013

The effect on methanogens attached to the surface of rumen ciliate protozoa by the addition of plant extracts (pine needles and ginkgo leaves) was studied with particular reference to their effectiveness for decreasing methane emission. The plant extracts (pine needles and ginkgo leaves) were added to an in vitro fermentation incubated with rumen fluid. The microbial population including bacteria, ciliated-associated methanogen, four different groups of methanogens and Fibrobacter succinogenes were quantified by using the real-time PCR. Gas profiles including methane, carbon dioxide and hydrogen, and runinal fermentation characteristics were observed in vitro. The methane emission from samples with an addition of individual juices from pine needles, ginkgo leaves and 70% ethanol extract from ginko leaves was significantly lower (p<0.05, 27.1, 28.1 and 28.1 vs 34.0 ml/g DM) than that of the control, respectively. Total VFAs in samples with an addition of any of the plant extracts were significantly lower than that of the control (p<0.05) as well. The order Methanococcales and the order Methanosarcinales were not detected by using PCR in any incubated mixtures. The ciliate-associated methanogens population decreased from 25% to 49% in the plant extacts as compared to control. We speculate that the supplementation of juice from pine needles and ginkgo leaves extract (70% ethanol extract) decreased the protozoa population resulting in a reduction of methane emission in the rumen and thus inhibiting methanogenesis. The order Methanobacteriales community was affected by addition of all plant extracts and decreased to less than the control, while the order Methanomicrobiales population showed an increase to more than that of the control. The F. succinogenes, the major fibrolytic microorganism, population in all added plant extracts was increased to greater than that of the control. In conclusion, pine needles and ginkgo leaves extracts appear to have properties that decrease methanogenesis by inhibiting protozoa species and may have a potential for use as additives for ruminants.

• Archives of Pharmacal Research
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• v.16 no.3
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• pp.244-250
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• 1993

Calli and suspension cultures were obtained following inoculation of the explant from leaves of Ginkgo biloba L on the supplemented MS basal medium. The obtained calli and suspension cultured cells were able to produce detectable amounts of ginkgolides which are known as natural specific PAF antagonists. The production of ginkgolides in the calli and suspension cultured celles were identified using GC/MS, GC and HPLC with authentic ocmpounds. Since the production of ginkgolides A and B the calli and suspension cultured cells had been confirmed, effects of types and concentration of plant growth regulators, media and illumination on the induction and growth of the callus were studied. The concentrations of growth regulators for optimal callus were studied. The concentrations of growth regulators for optimal callus induction were studied. The concentrations of growth regulators for optimal callus induction were 1.0 to 2.0 mg/L for NAA and o.1 mg/L for kinetin. The growth of the Callus seemed to be more simnultaed with the combination of NAA and kinetin than NAA and BA with illumination at all concentration ranges of 1.0 to 4.0 mg/l for NAA and o.1 to 1.0 mg/L for kinetin or BA studied. Amogn 8 different media used, the induction rate of callus on Anderson, Eriksson, and Shenk and Hildebrant at 4 weeks after the innoculation was almost the same as that of MS. However, callus was rarely induced on Heller or White medium. Suspension cultures were easily initiated with 3 g of callus (fresh weight) derived from ginkgo leaves on supplemented MS medium. A typical growth curve of suspension cultured cells could be obtained by measuring the fresh weight of the suspension cultured cells at every 3 days. To improve the growth of suspension cultured cells of ginkgo, effects of concentrations of NAA, sucrose, phosphate ions and molar ratio of $NH_{4}^+\;to\;NO_{3}^-$ ions in the culture medium were studied. The maximum growth of the cells was achieved when the culture medium contained 1.0 mg/L of NAA, 30 g/L sucrose, 1.75 mM phosphate ions and 1:5 molar ratio of $NH_{4}\;to\;NO_{3}^-$ ions.

• Clean Technology
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• v.29 no.3
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• pp.200-216
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• 2023

Ginkgo leaves are considered waste biomass and can cause problems due to the strong insecticidal actions of ginkgolide A, B, C, and J and bilobalide. However, Ginkgo leaf biomass has high organic matter content that can be converted into fuels and chemicals if suitable technologies can be developed. In this study, the effect of pyrolysis temperature, minimum fluidized velocity, and Ginkgo leaf size on product yields and product properties were systematically analyzed. Fast pyrolysis was conducted in a bubbling fluidized bed reactor at 400 to 550℃ using silica sand as a bed material. The yield of pyrolysis liquids ranged from 33.66 to 40.01 wt%. The CO₂ and CO contents were relatively high compared to light hydrocarbon gases because of decarboxylation and decarbonylation during pyrolysis. The CO content increased with the pyrolysis temperature while the CO₂ content decreased. When the experiment was conducted at 450℃ with a 3.0×U_mf fluidized velocity and a 0.43 to 0.71 mm particle size, the yield was 40.01 wt% and there was a heating value of 30.17 MJ/kg, respectively. The production of various phenol compounds and benzene derivatives in the bio-oil, which contains the high value products, was identified using GC-MS. This study demonstrated that fast pyrolysis is very robust and can be used for converting Ginkgo leaves into fuels and thus has the potential of becoming a method for waste recycling.

• Proceedings of the PSK Conference
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• 2003.04a
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• pp.166.2-167
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• 2003

The important biological activities of estrogen were reproduction and physiological processes in a number of tissues, including liver, bone, brain, blood vessels, adipose tissue and so on. The regulation of estrogen level is important a prevention of estrogen-related disease. Ginkgo biloba extracts (GSE) are extracted from leaves of the Ginkgo biloba tree. GSE contains 24％ phytoestrogen, which are kaempferol, quercetin, and isorhamnetin. (omitted)

• Journal of the Korean Chemical Society
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• v.26 no.2
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• pp.95-98
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• 1982

A new chemical constituent was isolated from the green leaves of Ginkgo biloba L. and identified as 3-(pentadec-8-enyl) phenol.

• YAKHAK HOEJI
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• v.19 no.2
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• pp.79-86
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• 1975

• Journal of the Korean Wood Science and Technology
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• v.36 no.1
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• pp.1-11
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• 2008

The purpose of this study is to examine the species of wooden members used in the Youngsanjeon Hall of the Sucknamsa temple in Anseong, Korea. Ninety-five wood samples from pillars, head-penetrating ties, beams, corner rafter, rafter, floor board and other wood members were identified. Seven species identified were hard pine, exotic pine, Zelkova serrata, Ginkgo biloba, Diospyros, Quercus(Cerrus) and Pyrus spp. In the case of pillars, eight were hard pines and the others Zelkova and Pyrus. Species of angle rafter were Ginkgo biloba and Zelkova. and those of beams were one hard pine and one Zelkova. Two purlin samples were Quercus(Cerrus) and rafters were hard pines except one Ginkgo and one exotic pine. Roof-filling timbers were identified as Zelkova and Diospyros spp. The other samples of roof-filling timbers were all identified as hard pines. The use of Ginkgo and several hardwoods in addition to hard pines may indicate supply of local logs near the Sucknamsa temple.