Tag Archives: Agriculture

PAPER: Leaf structure to prevent “incoming” particles. 葉の構造は大気中微粒子の付着を防止する?

Other “intro” of papers from our lab >> /tag/paper/


Our results suggest that epicuticular wax crystals affect distribution of particles on needles. Densely distributed epicuticular wax crystals might prevent the deposition of sub-micron particles on the surfaces of needles to retain the function of stomata.

電界放出型走査電子顕微鏡(FE-SEM)によるスギ(代表的な針葉樹種)の葉表面に人工的に散布されたサブミクロンサイズの炭素系粒子の局在を調べました。気孔の機能を保持するために、密に分布されたエピクチクラワックス結晶は、気中からの微粒子の付着を防止する役割があるかもしれません。 Continue reading PAPER: Leaf structure to prevent “incoming” particles. 葉の構造は大気中微粒子の付着を防止する?

PAPER: Dispersing particles then Raman spectroscopy: New concept for surface analysis. 新しい表面分析法:ラマン分光用の粒子集積

Other “intro” of papers from our lab >> /tag/paper/


* Main researcher: Masao Gen,  a doctoral student: 2011/10-2014/6. Joined Tohoku University (2014-2015, Researcher/Assistant professor), then City Univ. of Hong Kong. He applied this new method (Electrospray-Surface Enhanced Raman Spectroscopy (ES-SERS) for probing particulate matter (PM) collected as “air pollutant” Atmos. Chem. Phys. (2017)

pdf

M. Gen & I. W. Lenggoro, RSC Adv. (2015)
Gen & Lenggoro, RSC Adv. (2015)

Aerosol nanoparticle sensor system for probing a dip-coated layer of organic molecules, at sub-100 nm resolution .気中分散微粒子を用いたSERS法によって、表面上の分子「パターン」に対して直接「検査」可能な技術

関連技術 Related topics: 残留農薬の検出に向けて, Detect a pesticide in the field.

There’s more…さらに詳細に

3 students presented at 2 conferences, 学生の学会発表

2014.March, Gifu 化学工学会年会
Annual Conference of Society of Chemical Engineers, Japan
Surface characterization of organic thin film based on particle assembly (Oral)
微粒子の集積による有機薄膜の表面解析
(D3) 玄 大雄・Wuled Lenggoro
Keywords: Coating, Nanoparticle, Aerosol

http://www3.scej.org/meeting/79a/

2014.March, Gifu 化学工学会年会
Annual Conference of Society of Chemical Engineers, Japan
Immobilization and concentration control of fine particles in agar matrix by electrophoresis (Poster)
電気泳動による寒天ゲルへの微粒子の固定化と濃度分布の調整
(M2) 渡辺 あずさ・Wuled Lenggoro
Keywords: Hydrogel, Nanoparticle, Electrophoresis

2014.March.1, Tokyo
第16回化学工学会学生発表会(東京大会)
16th SCEJ students session
電界を用いた大気中微粒子の捕集器の作製 (A01)
(B4)福島 寿子・山田 洋介・Lenggoro Wuled
Keywords: aerosol, sampling, electrostatic

http://www.chemeng.titech.ac.jp/~stu16e/index.php

2014-Gifu-program-Gen

PAPER: Effect of water-soluble particles on the growth of plants (2 years)…植物に水溶性微粒子を与えていたら?

JOURNAL: Atmospheric Environment (2014)
http://www.sciencedirect.com/science/article/pii/S1352231014000405

Effects of 2-years exposure to (sub-micron) ammonium sulfate particles on growth and gas exchange rates of Fagus crenata (ブナ), Castanopsis sieboldii (スダジイ), Larix kaempferi (唐松) and Cryptomeria japonica (スギ) seedlings

•No significant effect of the particles on growth was observed after 2 years.
•Net photosynthetic rates of 3 species were not significantly changed.
•Net photosynthesis of Cryptomeria japonica was relatively sensitive to (NH4)2SO4.
•Both increase and reduction in net photosynthetic rate were observed in C. japonica.

4種類の植物のうち、スギの光合成速度は硫酸アンモニアの散布に影響を受けていることを見出した。

Four Japanese forest tree species were exposed to submicrometer (NH4)2SO4 particles.

A work from:
TUAT, Agriculture; TUAT, Engineering; Kyoto Univ.; Forestry and Forest Products Research Institute; Hokkaido Univ.

OTHER Recent Papers
https://empatlab.wordpress.com/tag/paper/

books

Student as a project leader in a MEXT/TUAT program, 学生が研究代表者

Masao Gen, a doctoral student got a grant for his project on advancing a sensor technology to detect pesticide on-site. Sponsor = Innovation Advancement Organization (IAO), based on a TUAT/MEXT project.
博士課程後期の学生(玄)が申請した研究プロジェクトが採択されました。
The program includes few-days training at SRI (Stanford Research Institute, California) and Cornell University.

[イノベーション推進機構より]
本プロジェクトは、文部科学省実践型研究リーダー養成事業「ニーズ展開実践型高度研究人材養成モデル化事業」の一環として、博士学生に対して専門分野の枠を越えた研究活動、インターンシップ、並びに産業界との連携を包括的に支援、促進することによって、事前学習で習得した知識や技術を実践し、研究リーダーに求められる能力、資質を磨いていくことを目的としています。博士後期課程学生については、研究代表者として自ら研究チームを組織し、企業等の課題を解決できる企画・提案を実践していくとともに、その後共同研究等に発展することを奨励することとし、これに必要な経費を支援します。

http://www.tuat.ac.jp/~innovate/student/collect.html#2

A reference of our Pesticide Detector (Gen et al., 2011)

PAPER. Measuring carbon particles on leaf surface, 葉面上の炭素系粒子の計測手法

Journal: Asian Journal of Atmospheric Environment (2012)

Optical method for measuring deposition amount of black carbon particles on foliar surface

Authors:
M. Yamaguchi, K. Takeda, Y. Otani, N. Murao, H. Sase, I. W. Lenggoro, K. Yazaki, K. Noguchi, A. Ishida, T. Izuta

Full article (PDF):
http://asianjae.org/browse_sub.html?class_no2=30

研究機関: 東京農工大学(農), 北海道大学(工), 日本環境衛生センター/アジア大気汚染研究センター, 森林総合研究所, 東京農工大学(工), 京都大学生態学研究センター

Affiliations
1: Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo
2: Graduate School of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo
3: Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido
4: Asia Center for Air Pollution Research, Niigata
5: Institute of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo
6: Forestry and Forest Products Research Institute, Tsukuba, Ibaraki
7: Shikoku Research Center, Forestry and Forest Products Research Institute, Kochi
8: Center for Ecological Research, Kyoto University, Otsu, Shiga
9: Institute of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo

To perform quick measurements of black carbon (BC) particles deposited on foliar surfaces of forest tree species, we investigated an optical method for measuring the amount of BC extracted from foliar surfaces and collected on quartz fiber filters. The seedlings of Fagus crenata, Castanopsis sieboldii, Larix kaempferi and Cryptomeria japonica were exposed to submicron BC particles for one growing season (June to December). At the end of the growing season, the leaves or needles of the seedlings were harvested and washed with deionized water followed by washing with chloroform to extract the BC particles deposited on the foliar surfaces. The extracted BC particles were collected on a quartz fiber filter. The absorption spectrum of the filters was measured by spectrophotometer with an integrating sphere. To obtain the relationship between the absorbance of the filter and the amount of BC particles on the filter, the amount of BC particles on the filter was determined as that of elemental carbon (EC) measured by a thermal optical method. At wavelengths below 450 nm, the absorption spectrum of the filter showed absorption by biological substances, such as epicuticular wax, resulting in the low coefficient of determination (R2) in the relationship between the amount of EC on the filter (MEC, μg C cm−2 filter area) and the absorbance of the filter. The intercept of the regression line between MEC and the absorbance of the filter at 580 nm (A580) was closest to 0. There was a significant linear relationship between the A580 and MEC (R2 = 0.917)

files-folderRecent topics from published journal articles: 最近の論文概要

Visited Institut Teknologi Bandung and Universitas Padjadjaran (12 Nov.)

After attended and presented at RSCE 2012 in Bali,
on 12 Nov. Lenggoro visited two campuses in Bandung, West-Jawa, Indonesia.
Institut Teknologi Bandung (ITB) and Universitas Padjadjaran (UnPad)

Photo from International.ITB.Ac.Id1. Department of Environmental Engineering, ITB
2. Department of Physics, ITB
3. Department of Physics, UnPad.
4. Faculty of Agriculture, UnPad
(with a seminar “Inter-departmental collaboration: Particle Engineering for Agriculture”)