• Title, Summary, Keyword: pollen analysis

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The Use of Pistachio Pollen for the Production of Nanostructured Porous Nickel Oxide

  • Atalay, F.E.;Yigit, E.;Biber, Z.S.;Kaya, H.
    • Nano
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    • v.13 no.12
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    • pp.1850143.1-1850143.9
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    • 2018
  • Natural biotemplates - such as bacteria, fungi and viruses - are used in nanostructured metal oxide production. The pollen can be found abundantly in nature, and their microcapsules can be easily isolated from the pollen by chemical treatments. To date, pollen microcapsules are mostly used as drug carriers and catalytic agent templates. In the present study, nanoporous-structured nickel oxide is produced using Pistachio pollen microcapsules. The raw pollen, chemically treated pollen and metal-coated pollen were characterized using scanning electron microscopy, Brunauer-Emmett-Teller (BET) surface area analysis, thermogravimetric analysis (TGA), differential thermal analysis (DTA) and X-ray diffraction (XRD) techniques. The natural Pistachio pollen which were procured from Gaziantep, Turkey, are spherical, with a diameter of approximately $23{\mu}m$. The maximum surface area obtained for nickel oxide-coated microcapsules is $228.82m^2/g$. This result shows that Pistachio pollen are an excellent candidate for the production of porous nanostructured materials for supercapacitor electrodes.

Past Vegetation of Moojaechi on Mt. Jungjok by Pollen Analysis (화분분석에 의한 정족산 무제치늪의 과거식생)

  • 박재근;장남기
    • The Korean Journal of Ecology
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    • v.21 no.5_1
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    • pp.427-433
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    • 1998
  • The standing crop and net production were estimated in Moojaechi on Mt. Jungjok. By using the decay model of organic carbon, absolute year of bog peat was calculated. Pollen analysis to bog peat revealed vegetational history and climate change around Moojaechi. The time required for amount of the accumulated peat in the bog was estimated in terms of the balance of the accumulation and decay of organic carbon of the deposit peat. Absolute year of the peat surveyed in this study was about 314 years. Pollen of Pinus was predominant in all the pollen zone, Geamineae and Cyperaceae increased in lower pollen zone while Pinus in upper pollen zone. This showes that climate of the past was probably more humid than that of present. In addition, middle pollen zone showed warming trend which is suggested by high pollen concentration of Quercus, Juglans, Carpinus and Corylus. It suggests that overall environment and vegetation were changed from warmer and more humid to dry condition in Moojaechi and it is considered as the course of boggy ground formation by retrogressive successions.

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The Change of Paleoenvironment during the Late Holocene in the Neungsan-ri Alluvial Plain, Buyeo-gun, Chungnam-Province, Korea (충남 부여 능산리 충적평야의 홀로세 후기 고환경 변화)

  • Yoon, Soon-Ock;Kim, Yae-sun;Hwang, Sangill
    • Journal of The Geomorphological Association of Korea
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    • v.23 no.3
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    • pp.1-11
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    • 2016
  • This study estimated vegetation environment and agricultural activity during the late Holocene inferred from pollen analysis of peat on floodplain of Wangpo-cheon around Neungsan-ri, Buyeo-gun, South Korea. By result of pollen analysis of 28 horizons from Trench NS 1 and NS 4, vegetation environment during 2,300 to 1,700 yr BP was divided into Pollen Zone I (Quercus-Alnus), Pollen Zone II (Quercus-Alnus-Gramineae) and Pollen Zone III (Pinus-NAP-Gramineae). The pollen analysis suggests that agricultural activity in the Buyeo area was widely spread from the early time of the Pre-Iron Age to the late Samhan Age and buckwheat field seem to be built to substitute paddy field during the early time of the Pre-Iron Age.

A Pollen Analysis on the Peat of Paengsung Area, Kyonggi-do (京畿道 彭城地域의 土炭의 花紛分析)

  • Park, In-Keum
    • The Korean Journal of Ecology
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    • v.16 no.3
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    • pp.365-374
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    • 1993
  • Pollen analysis on a 320cm core collected from paengsung area (36°56′50"N, 127°03′10"E) in southwesterm korea was carried out to investigate the changes in past climate and vegetation in that area. In this research it was found that pollen zones are divided into two layers of substage IIb and IIc. Pollen zone IIb, the lower layer, was dominated by high percentages of deciduous broadleaved trees such as alnus, Quercus, Corylus, Betula, Carpinus and Salix. Trapa, Typhaceae and Nymphaceae growing in wet habitat and Chenpodiaceae were pornounced amont the nonrboreal pollens. At that time, it seems that it was warmer and more humid than present. In pollen zone IIc, the upper layer, pollen of Pinun was dominant and those of Artemisia, Gramineae, Compositae, Cyperaceae and spore increased while of Quercus, Betula and Nymphaceae decreased. It is supposed that the climate of this zone was drier that the lower laywer.

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Reconstruction of Paleo-Temperature During the Holocene Using WA-PLS Analysis of Modern Pollen From the Surface Soil in the Southeastern Part of the Korean Peninsula (표층화분의 WA-PLS 분석을 통한 한반도 남동부지역 홀로세 고기온 복원)

  • Yoon, Soon-Ock;Hwang, Beomjin;Hwang, Sangill
    • Journal of The Geomorphological Association of Korea
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    • v.24 no.4
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    • pp.13-25
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    • 2017
  • To reconstruct the paleo-temperature quantitatively and to overcome limitation of traditional qualitative pollen analysis, this study was performed pollen analysis using the modern surface soil at Yulha-dong, Gimhae-si of southeastern part of Korean peninsula. Canonical Correspondence Analysis(CCA) was done to identify the most important environment variable about composition of modern surface pollen sample. Also, Weighted Average-Partial Least Square(WA-PLS) was analyzed to obtain modern surface pollen-temperature transfer function. The transfer function was applied to the results of qualitative fossil pollen analysis at Yulha-dong, Gimhae-si, Sampyung-ri, Ulsan-si and Taewha-dong, Ulsan-si. Therefore, the paleo-temperature was reconstructed during the Holocene since 6,200 yr BP. According to the results of the research, it is $1{\sim}2^{\circ}C$ lower than the current average annual temperature at the study area in 6,200 yr BP, since then it increased to the same level to the current temperature and decreased again until 2,600 yr BP. From the 2,600 yr BP, the temperature was fluctuated to the present.

Pollen Analytical Study on Humus Accumulated at Plant Communities of Mt. Seolag (설악산 식물군락 유기물층의 화분분석학적 연구)

  • 강상준
    • Journal of Plant Biology
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    • v.30 no.4
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    • pp.267-276
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    • 1987
  • A pollen analytical study was carried out on the accumulated humus samples collected from 27 sites under the different plant communities of Mt. Seolag. These pollen spectra were then compared with the actual vegetation. The aboreal pollen(AP) and non-abnoreal pollen(NAP) were 1 Family 25 Genus and 5 Family 5 Genus, respectively. Among the aboreal pollen identified, the pollen of Pinus, Quercus, Betula and Acer were appeared in abundance and the coniferous pollen of Pinus was occupied at least 20%-65% through all the sites studied. The pollens of Abies, Betula, accer, Quercus, Carpinus, Corylus, Fraxinus, Styrax, Prunus and Ericaceae were in accordance with the present vegetation but the other pollens were inconsistent with the actual vegetaton. It suggests that it was caused by the difference between Wehseolag and Namseolag of subalpine zone in Mt. Seolag was 200 m by pollen spectra. Quercus was distributed at the lower part of Namseolag and the subalpine boreal elements were increased with increasing altitudes. The pollen spectra of each site was put together into 5 groups of pollen assemblage by cluster analysis and the community coefficient (CC) was over 60% between all sites studied.

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The impact of climate change on pollen allergy in Korea (한국의 기후 변화가 꽃가루 알레르기에 미치는 영향)

  • Oh, Jae-Won
    • Allergy, Asthma & Respiratory Disease
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    • v.6 no.sup1
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    • pp.31-39
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    • 2018
  • Weather may alter the concentrations of pollens which can subsequently influence the occurrence of allergic diseases. Many studies have demonstrated that greenhouse gases increase pollen concentration. Daily fluctuations in the pollen concentration have to do with a variety of meteorological factors such as temperature, rainfall and sunshine amount; therefore, it is complicated. At least more than 10 weather elements that affect the concentration of pollen. Earlier pollination and rising pollen concentrations have been reported in many countries. Most studies have focused on analysis of their relationships with local meteorological and climatic factors. Observed pollen data at locations representing a wide range of geographic and climatic conditions should be analyzed statistically to identify pollination date, pollen season length, and annual mean and peak values of daily concentrations of pollen. The seasonal and regional variations of pollen have also been changed in South Korea with climate change. There were evaluated sensitization rate to pollen in South Korea since 1997. Sensitization rates for weed and tree pollens are increased in Korean children, especially with increasing pollen concentration of ragweed and Japanese hop. It has been demonstrated that urbanization correlate with the increasing pollen allergies. However, the effects of environmental change on allergic diseases have not yet been completely understood. Recently there have been many epidemiological studies on the relationship between allergic diseases and climate changes. Previous studies suggest that climate changes interact with and affect pollen allergy, which in turn increases the frequency and severity of allergic disease.

A Pollen Analysis in the Peat Sediments from Pyung Taek County Korea (평택지구 토탄의 화분분석)

  • 오지영
    • Journal of Plant Biology
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    • v.14 no.3
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    • pp.66-73
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    • 1971
  • Pollen analysis was made on peat deposits in the area of Pyung Taek County, Central Korea. Arboreal pollen(AP) of Alnus, Abies, Ligustrum, Viburnum and Carpinus composed 70-80% of the total pollen detected in this sample area. Judging from the large amount of arboreal pollens, one can assume that those species were dominant in this district when the pollen was deposited. Among the arboreal pollens, Alnus pollen occurred more often than any other trees. Pollens of Betula, Tilia and Ulmus occurred rarely in each layers of peat deposit. The pollen diagram showed that Pinus and Abies markedly increased from the bottom to the top of the peat, while Ligustrum, Quercus and Tilia decreased proportionately. Non-arboreal pollens (NAP) and spores composed about 30 percent at the lower layer, but decreased considerably in the upper layer.

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A Pollen Analytical Study of the Peat Sediments from the Chollipo Arboretum in Southwestern, Korea (千里浦 樹木園의 泥炭의 花紛分析)

  • Park, In-Keun
    • The Korean Journal of Ecology
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    • v.13 no.4
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    • pp.311-320
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    • 1990
  • This paper deals with pollen analysis of a 190cm core collected from the Chollipo Arboretum sedimentary basin($N36^{\circ}47$ 43", $E1269^{\circ}$ 7") in southwestern Korea in order to know the change of the climate and vegetation. In this research it is found that the pollen zones are divided into two layers. Pollen zone, I, the lower layer, is flourished with broadleaved trees such as Quercus, Alnus, Corylus, Betula, Carpinus and Castanopsis, and about 30~40% of pollen of those trees consist of that of Q. acuta/glauca and Castanopsis which are evergreen trees. And pollen of Trapa, Typhaceae and Nymphaceae living in wet habitat, is dominant among the nonarboreal pollen. Therefore we can conclude that it ould be warmer and more humid than present in this area of the past. In pollen zone, the upper layer, pollen of Pinus is dominant and those of Artemisia, Gramineae, Compositae and spore are increased in quantity, while pollen of Quercus, Belula and Nymphaceae decreased. It it supposed that the climate of this zone was drier than that zone.that zone.

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Characteristics and Temporal Distribution of Airborne Pollen in an Urban Area of Japan

  • Ma Chang-Jin;Kasahara Mikio;Tohno Susumu;Kang Gong-Unn
    • Journal of Korean Society for Atmospheric Environment
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    • v.21 no.E3
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    • pp.107-113
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    • 2005
  • Using a sampling device of our own making, airborne pollen has been monitored in Kyoto, Japan from the middle of February to the end of May 2004. From the morphological analysis of pollen grains by Scanning Electron Microscope (SEM), it was possible to identify some pollen types like Cryptomeria, Pine, Alder, Cyclobalanopsis, Chamaecyparis, and Equisetum. Daily average airborne pollen counts show strong variations from the day to day which makes the appropriate daily forecasts that could be of practical use for patients difficult. Diurnal variation of airborne pollen grains at our local sampling site is very irregular and shows no similarity between pollen types. The highest concentrations of Cryptomeria and Alder pollens in the south -west wind directions might be attributed to the airborne pollen transport, while the increase in Pine pollen grain in the southern wind direction was probably due to the local spread. Prevailing wind direction (SW) during the pollinating periods of Cryptomeria and Alder pollens could suggest a long-distance transport from a distant mountain.