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- 저자 : ( Boo Hae Koo ) (검색결과 2 건)
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Sorption and leaching characteristics of pesticides in volcanic ash soils of Jeju Island, Korea
Park Won-Pyo,Chang Kong-Man,Hyun Hae-Nam,Boo Kyung-Hwan,Koo Bon-Jun 한국응용생명화학회 2020 Applied Biological Chemistry (Appl Biol Chem) Vol.63 No.6
It is important to evaluate leaching behavior in agricultural soils to prevent the pollution of groundwater by pesticides. We identified the distribution coefficients (K d ) of ten pesticides with different physicochemical properties and compared their leaching characteristics using wick lysimeters from three distinct soil types on Jeju Island. The K d values varied by pesticide and soil, but were within the range of 1.2 to 4231 L kg −1 . Based on the European standard (K d < 10 L kg −1 ), six pesticides (alachlor, ethoprophos, carbofuran, napropamide, tebuconazole, and etridiazole) were mobile in at least one tested soil, and their soil organic carbon affinity was ≤ 5.811. This value differed greatly from the other pesticides (16.533 and higher). The solubility of the six mobile pesticides was ≥ 32 mg L −1 , which substantially differed from the other pesticides (≤ 0.71 mg L −1 ). Thus, we conclude that our mobility assessment, which is based on K d values, can be used to predict the leaching of pesticides in the volcanic ash soils of Jeju Island. The use of pesticides should be strictly controlled to reduce the possibility of groundwater contamination.
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Adaptive responses of cardiac function to fetal postural change as gestational age increases
( Woo Jin Kim ),( Hye Jin Choi ),( Sun Young Yang ),( Boo Hae Koo ),( Ki Hoon Ahn ),( Geum Joon Cho ),( Soon Cheol Hong ),( Min-jeong Oh ),( Hai-joong Kim ) 대한산부인과학회 2016 Obstetrics & Gynecology Science Vol.59 No.6
Objective The cardiovascular system maintains homeostasis through a series of adaptive responses to physiological requirements. However, little is known about the adaptation of fetal cardiac function to gravity, according to gestational age. In the present study, we aimed to evaluate the adaptive responses of cardiac function to postural changes, using Tei index measurements. Methods Fetal echocardiography and Doppler examination were performed on 114 women with vertex singleton pregnancies at 19 to 40 weeks` gestation. Participants were placed in an upright seated position, and the Tei index for fetal left ventricular cardiac function was measured. The women were then moved into a supine position and the Tei index was re-measured. Results The mean Tei index when measured in an upright seated position was significantly lower than that measured in a supine positioning for all fetuses (0.528±0.103 vs. 0.555±0.106, P=0.014, respectively). This difference was also noted in fetuses with a gestational age of 28-40 weeks (0.539±0.107 vs. 0.574±0.102, P=0.011, respectively). However, there was no difference in the Tei index between an upright seated and a supine position among fetuses with a gestational age of <28 weeks (0.505±0.091 vs. 0.516±0.103, P=0.571, respectively). Conclusion Postural changes from an upright seated to a supine position result in an increased Tei index after a gestational age of 28 weeks. This appears to reflect maturation in the adaptive responses of the fetal cardiovascular system to postural changes.
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