Changes of Physicho-Chemical Properties of Reclaimed Land Sediment - A Case Study of KIMPO Reclaimed Land

The sediments of the tidal flat and the reclaimed land were compared in terms of physical and chemical properties, and studied the factors affecting the changes with regard to the relationship of the tidal creek distance and vegetation. The study area, reclaimed ten years ago, is located in KIMPO LANDFILL SITE stadding kimpo-kun, kyonghi-Do and Paeksok-Dong, Inchon. Five sites were selected for the study, One is in the tidal flat and the others are in the reclaimed land. Five undisturbed samples were cored with vibracoring equipment. Each sample was 120㎝ high and analyzed the sediment's physico-chemical properties in 5㎝ units. The plant species and organic matter contents were investigated to find out the relationship between the physico-chemical properties and the vegetation. The major findings were summed up into the followings. First, from the grain-size analysis, the ration of the sand, silt, and clay was 1.80%, 61.09% and 37.11% in the tidal flat smaple and 3.20-6.15%, 75.52-87.08% and 9.71-18.33% in the reclaimed land. Less clay percentage in the tidal flat seems to result from the clay eluviation or the deposition environmental change after reclamation. However, it was not clear in this study. According to the U.S. Department of Agriculture's classification standards, the sediment of the sample sites was classified as silty-clay loam in the tidal flat, and as silt and silty loam in the reclaimed land

공군 조종사의 건강행위에 대한 인식 및 실천에 관한연구

학위논문(석사) --서울대학교 대학원 :보건학과(보건정책관리학전공),2008. 2.Maste

Morphological Changes and Sediment Budget of Coastal Dunefields in Shinduri, Korea

서해안 태안반도의 신두리 해안사구지대에서 지형형성과정과 지형변화 패턴을 밝히기 위해 사구지형 형성과정에 직접적으로 영향을 미치는 기상, 식생, 퇴적물 등의 인자를 계측하였다. 신두리 사구지대에서 일어났던 장기간의 지형변화 과정을 파악하기 위해 지형도와 항공사진을 분석하였다. 또한 정밀측량과 주기적인 측량을 통해 신두리지역에서 현재 진행되고 있는 지형변화와 퇴적물 수치를 파악하였다. 연간 평균 풍속은 3.02 m/s였으며, 모래의 이동이 시작되는 임계풍속 6 m/s 이상의 바람은 11월에서 4월 사이에 집중되었다. 풍향은 겨울철에는북풍이 우세하며 여름철(6월~8월)에는 대체로 남풍이 우세함을 볼 수 있다. 신두리 사구지대에 출현하는 식물 가운데 사구고유종은 26종이었다. 이 가운데 갯지렁은 대부분의 전사구에서 서식하고 있어 전사구 부분의 사구천이과정에서 나타나는 개척종이었으며, 전사구 이외의 지역에서 모래의 집적이 심한 곳에서는 통보리사초가 개척중인 것으로 나타났다. Coastal dunefield of Shinduri in west coast of Korea is in a dynamic environment. A pattern of morphological change was investigated for a year through analysing factors such as meteorology, vegetation and sediment which have direct effects on the formation of coastal dunes. Analysis of topographic maps and aerial photographs showed long term changes in morphology. Sediment budget in this area was calculated through surveying and periodical measuring. Annual mean wind velocity was 3:02m/s. Threshold wind velocity that allowed sand movement was 6/s, and wind above 6m/s was frequent during winter season. Northwesterly is dominant in winter and southerly in summer

Morphological changes and sediment budget of coastal dunefields in Shinduri, Korea

학위논문(박사)--서울대학교 대학원 :지리학과,2001.Docto

Mass-Balanced Isotope Tags for Protein and Peptide Quantification using Mass Spectrometry

DoctorAccurate identification and quantification of proteins expressed under different physiological conditions are very important in proteomics. Mass spectrometry (MS) combined with stable isotope-coded chemical tagging methods enables quantification and identification of protein. Recently, a number of the isobaric tags encoded by several stable isotopes have been introduced for simultaneous peptide sequencing and quantification in tandem MS (MS/MS). To expand the scope of isobaric tags in MS-based quantitative proteomics, we developed various H/D isotope-coded tags. Firstly, we present new isobaric tagging reagents called ？mass-balanced H/D-isotope dipeptide tags (MBITs)？ and methods for quantificaton. MBITs are N-acetyl dipeptides with amine-reactive O-succinimidyl ester (N-acetyl-Xxx-Ala-OSu, Xxx-tag). The H/D isotopes are incorporated into the N-acetyl group as CH3CO and CD3CO for LMBIT and HMBIT, respectively, while the mass balance is achieved by encoding alanine (Ala) with CD3 and CH3, respectively. To prove the concept, we use Ala in place of Xxx. The H/LAla-tag was prepared in either solution- or solid-phase. The coupling reaction between Ala-tag and a model peptide (angiotensin II) was optimized to achieve complete conjugation without side reactions. The isotopomeric model peptides differentially tagged by H/LAla-tag yield 2-plex isotope-coded fragment ions (LbS and HbS) by MS/MS. The measured ratios between LbS and HbS ([LbS]/[HbS]) reproduced well the premixed ratios of peptides. Secondly, MBITs are diversified as variable-mass tags by preparing seven more derivatives of Xxx-tags (Xxx = Ser, Val, Gln, His, Phe, Arg, and Tyr). Their performances in target conjugation, quantification linearity, and co-migration in liquid chromatography (LC) are checked with standard peptides (bradykinin and angiontensin II). H/LMBIT-linked isotopomeric peptides co-migrate in reverse-phase LC, and their tandem mass spectra exhibit the 2-plex signals as well as sequence ions in comparable abundances. The variation in Xxx changes the chromatographic elution profile as well as the ionization efficacy of target peptides. Of eight tags, His- and Gln-tags are best because of their strong and stable quantitation signals. His-tag shows the strongest signal due to histidine-specific fragmentation. Quantitation signal from Gln-tag show the least secondary fragmentation due to stable b-type ion. Diversified masses and properties of Xxx-tags provide the multiplexed protein quantificaton. Combination of (n？1) 2-plex Xxx-tags enables n-plex quantification. As a real application, four different Xxx-tags are applied to the multiplexed quantification of yeast heat shock protein (Hsp82p) expressed under five different chemical stresses in a single LC-MS experiment.Lastly, we provide a new strategy of protein quantification by presenting unique high-mass quantitation signals of MBITs attached to the lysine side chain. Although various isotope-coded isobaric tags have been widely used in MS-based quantitative proteomics, most of them provide quantitation signals in the low-mass region which is not accessible by common quadrupole ion trap tandem MS. Importantly, MBITs result in quantitation signals (L/HyS,K ions) in high-mass, noise-free region. Both arginine- and lysine-terminated tryptic peptides are examined by MALDI-TOF/TOF and ESI-QIT. Herein, we demonstrate for the first time the significance of high-mass signals originated from lysine-terminated peptides and present a lysine-tagging strategy of utilizing MBITs for MS-based quantitative proteomics using ion trap tandem MS

MALDI-TOF Mass Spectrometric Detection of Semiconductor Nanocrystals Using Porphyrin Matrices

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Porphyrin-Based Matrices for Laser Desorption/Ionization of Zinc, Cadmium, and Lead Sulfide Quantum Dots

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Mass-Balanced Isotope Tag: a Robust Isobaric Tag Available in All Mass Spectrometry Platforms for Quantitative Proteomics

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Measurement of the Peptide Ion Temperature Using N-Acyl Dipeptide Tags and Determination of the Peptide Fragmentation Energetics

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Energy-Dependent Fragmentation of Mass-Balanced 1H/2H Isotope Dipeptide Tags: High- vs. Low-Mass Signal Ions for Protein Quantitation and Temperature Measurement

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