• Mycobiology
• /
• v.28 no.3
• /
• pp.153-157
• /
• 2000

In this paper, the distribution, host restriction, and taxonomic position of Valsa mali are discussed.

• Bulletin of the Korean Chemical Society
• /
• v.27 no.6
• /
• pp.903-908
• /
• 2006

Various extraction procedures were investigated using reference materials and samples to evaluate extraction efficiency and effectiveness. Inductively coupled plasma mass spectrometry (ICP-MS) was used to measure total arsenic and to quantitate arsenic species when coupled to an HPLC (high pressure liquid chromatography). Arsenic species were extracted from rice flour (NIST SRM 1568a) with water/methanol mixtures using accelerated solvent extraction (ASE). Total arsenic extraction efficiency ranged from 42 to 64%, for water and various methanol concentrations. From spinach (NIST SRM 1570), freeze-dried apple, and rice flour (NIST SRM 1568a), arsenic species were extracted with trifluoroacetic acid (TFA) at 100 ${^{\circ}C}$. Total arsenic extraction efficiency was 90% for spinach, 75% for freeze-dried apple, and 83% for rice flour. Enzymatic extraction with alpha-amylase and sonication resulted in extraction efficiency of 104% for rice flour, 98% for freeze-dried apple, and 7% for spinach. Chromatograms of arsenic species extracted by the optimum extraction methods were obtained, and the species were quantified. Arsenite (As(III)), arsenate (As(V)), dimethylarsinic acid (DMA), and monomethylarsonic acid (MMA) were found in the apple sample, and DMA and As(V) in the rice flour sample. As(V) and MMA were found in three herbal dietary supplement samples.

• Korean Journal of Agricultural Science
• /
• v.49 no.4
• /
• pp.881-892
• /
• 2022

Fire blight in apple and pear orchards, caused by Erwinia amylovora, is a global problem. Ongoing outbreaks have occurred since 2015. In 2020, 744 orchards were infected compared with 43 orchards in 2015 in Korea. When are insufficient. In Korea, all host plants in infected orchards are buried deeply with lime to eradicate the E. amylovora outbreak within a few days. Apple trees with infected trunks and branches and twigs with infected leaves and infected blooms were collected from an apple orchard in Chungju, Chungbuk province, where fire blight occurred in 2020. We used these samples to investigate the population density and internal distribution of E. amylovora on infected branches and twigs during early season infections. Infected branches and twigs were cut at 10 cm intervals from the infected site, and E. amylovora was isolated from tissue lysates to measure population density (colony-forming unit [CFU]·mL^-1). The polymerase chain reaction was performed on genomic DNA using E. amylovora specific primers. Real-time polymerase chain reaction (PCR) was performed to detect E. amylovora in asymptomatic tissue. The objective of these assays was to collect data relevant to the removal of branches from infected trees during early season infection. In infected branches, high densities of greater than 10⁶ CFU·mL^-1 E. amylovora were detected within 20 cm of the infected sites. Low densities ranging from 10² to 10⁶ CFU·mL^-1 E. amylovora were found in asymptomatic tissues at distances of 40 - 75 cm from an infection site.

• Journal of Korean Society for Atmospheric Environment
• /
• v.31 no.1
• /
• pp.63-71
• /
• 2015

The gaseous and particulate emissions from agricultural crop residues burning were investigated. The test residues included white soybean stem, pepper stem, apple branch, peach branch, pear branch, grape branch, sesame stem, perilla stem, and barley stem. Particulate emissions were dominated by fine particles (< $0.1{\mu}m$ in size). The highest $PM_{2.5}$ Emission factors were from barley stems (35.2 g/kg), and the lowest from pepper stems (7.9 g/kg). Emission factors for CO, NO, and VOCs were 146~305 g/kg, 4.94~15.02 g/kg, 27.4~353.3 g/kg, respectively. Benzene played an important role in VOCs emissions from biomass burning.

• Steel and Composite Structures
• /
• v.24 no.1
• /
• pp.15-22
• /
• 2017

A green biosynthesis method is described for the preparation of Polyaniline (PANI)-cerium dioxide ($CeO_2$) nanocomposites in different media via in-situ oxidative polymerization procedure. The effect of various media including use of HCl, Lemon Juice, Beverage, White Vinegar, Verjuice and Apple vinegar extracts on the particles size, morphology as well as the conductivity of $PANI-CeO_2$ nanocomposites was investigated. The electron-withdrawing feature of $CeO_2$ increases doping level of PANI and enhances electron delocalization. These cause a significantly blue shift of C = C stretching band of quinoid from $1570cm^{-1}$ to $1585cm^{-1}$. The optical properties of the pure material and polymeric nanocomposites as well as their interfacial interaction in nanocomposite structures analyzed by UV-visible spectroscopy. The DC electrical conductivity (${\sigma}$) of as-prepared HCl doped PANI and a $PANI-CeO_2$ nanocomposite measured by a four-probe method at room temperature was studied.

• Journal of Biosystems Engineering
• /
• v.19 no.4
• /
• pp.311-317
• /
• 1994

Warts and barks of apple trees were vector of White rot. Two devices removing warts and barks for the use of pest control on apple trees were developed and evaluated in this study, and their results are as follows ; 1. A total of 148 warts were examined to determine the average size. About 35 percent of the examined warts were 6~8mm long, 4~8mm wide and 4~6mm thick in size. About 30 percent of the examined warts were 4~6mm long, 2~4mm wide and 6~8mm thick in size. 2. Seventy-one percent of the examined barks removed were 4~8mm in thickness. 3. A blade with 30 degree of cutting angle required 3 to 22 percent less cutting energy than those with 15 and 45 degrees of cutting angles. 4. The cutting torque decreased from 31 N-cm to 12 N-cm with an increase of cutting speed from 26cm/s to 104cm/s for a feeding speed of 0.31 mm/s with the blade angle of 30 degrees. 5. The cutting torque increased from 6N-cm to 32N-cm with an increase of branch diameter from 6mm to 14mm for a feeding speed of 0.31 mm/s with the blade angle of 30 degrees. 6. Two devices mounted on a mower for removing warts and barks were evaluated and proved effective.

• Korean journal of applied entomology
• /
• v.60 no.1
• /
• pp.99-103
• /
• 2021

This study was conducted to investigate the hatching rate of Pochazia shantungensis according to the treatment method of machine oil and the effect on apple quality by spawning. In the effect of machine oil treatment, when 20 times of the machine oil was spread by brush, the average hatching rate was 0.57%, and the sprayed branches showed an average hatching rate of 1%. When the machine oil agent was applied 50 times, the hatching rate was about 35% to spread by brush, whereas the spray treatment showed about 77%, so there were no difference from the non-treatment considering the deviation. There was no statistically significant difference in the quality of fruit even when apple fruits were fruited in the following year in the results of spawning and non-spawning of P. shantungensis in Hongro and Fuji varieties. In addition, there was no statistical significance in the difference between branch breakage and growth caused by spawning of P. shantungensis.

• Korean Journal of Food Science and Technology
• /
• v.34 no.4
• /
• pp.583-589
• /
• 2002

The rheological properties of apple pectins and tomato pectins with different degrees of side branches (sample I and sample II) were investigated with wide range of shear rate by theological modeling. Among the Power law model, Cross model and Carreau model, the Carreau model was the best fitted to the experimental data. Increasing in branching of apple pectins resulted in higher zero-shear viscosity $({\eta}_0)$. But, tomato pectins that have a low degree of side branches were shown litte difference between sample I and sample II. It is concluded that side branches of pectins can result in significant difference in rheological properties. And, this is predicted by the Carreau model.

• Journal of Periodontal and Implant Science
• /
• v.53 no.5
• /
• pp.336-346
• /
• 2023

Purpose: The Korea Oral Biobank Network (KOBN) was established in 2021 as a branch of the Korea Biobank Network under the Korea Centers for Disease Control and Prevention to provide infrastructure for the collection, management, storage, and utilization of human bioresources from the oral cavity and associated clinical data for basic research and clinical studies. Methods: To address the need for the unification of the biobanking process, the KOBN organized the concept review for all the processes. Results: The KOBN established standard operating procedures for the collection, processing, and storage of oral samples. Conclusions: The importance of collecting high-quality bioresources to generate accurate and reproducible research results has always been emphasized. A standardized procedure is a basic prerequisite for implementing comprehensive quality management of biological resources and accurate data production.

• Horticultural Science & Technology
• /
• v.35 no.1
• /
• pp.142-146
• /
• 2017

In Korea, kiwifruit is grown within a limited region on the southern coast where the climate is warm. Since the yellow - fleshed kiwifruit variety, 'Hort16A', first became commercially available, we have focused on breeding additional yellow - fleshed kiwifruits. Here, we describe the cultivar 'Goldone', which originated from 'Red Princess' and is characterized by red coloration around the fruit core. Conventional field crosses were performed in 2003, and permission for final release of 'Goldone' was obtained in 2011. This cultivar is very productive, with an average fruit weight of 129 g, which is 39% heavier than that of the cultivar 'Hayward'. 'Goldone' is harvested in late October, approximately 165 - 170 days after anthesis. In general, 'Goldone' has approximately eight flowers per fruiting shoot; these flowers must be thinned before blooming for commercial production. 'Goldone' was registered at the Korean Seed & Variety Service in 2014 for plant variety protection rights (grant no. 4835).