82,743 research outputs found
The nature of 6,6 '-bis(triphenylamine) substituted BINOL as chromophoric and fluorogenic hybrid chemosensor for selective fluoride detection
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Evaluation of assays for epoxides in oxidized lipids
No full textEpoxides have long been recognized as lipid oxidation products, and there is recent evidence that epoxides may be as or more important than hydroperoxides under many conditions. Nevertheless, epoxides are seldom analyzed when monitoring oxidative degradation, at least in part because there are few established analytical procedures. The goal of this thesis research, therefore, was to evaluate four available epoxide assays for accuracy, sensitivity, stoichiometry, reproducibility, and handling requirements, and from the results provide analytical protocols and practical guidelines for selection and application of assays for lipid epoxides. AOCS standard HBr titration of epoxides, nitrobenzylpyridine (NBP) reaction with colorimetric endpoint, diethyl dithiocarbamate (DETC) complexation with high pressure liquid chromatography (HPLC) separation and quantitation of adducts, and 1H nuclear magnetic resonance (NMR) analysis of epoxides were evaluated using epoxybutane, epoxyhexene, and epoxydecene as standards. The HBr assay is too insensitive (detects 0.0075-0.1M) for following lipid epoxides in foods and biological materials. In addition, the reaction must be run under inert atmosphere to prevent non-specific oxidation of the Br, and HBr degrades so rapidly that frequent restandardization is necessary. Nitrobenzylpyridine assay is more sensitive, detecting 0.5 mM epoxides. However, the NBP reaction response varied considerably with time and temperature of reaction and with epoxide structure (increased with epoxide chain length). Hence, a different standard must be used for each epoxide analyzed, and selection of an appropriate standard for epoxides of unknown structure is problematic. For the DETC assay, reaction response was linear from 1M to 1 mM for all three epoxide standards (R2 > 0.99) and oxidized methyl linoleate (R2 > 0.94), and increased with epoxide chain length. HPLC analysis of adducts allows differentiation and quantitation of individual epoxides, so can provide important information about oxidation chemistry as well as quantitation. NMR offers the advantage of direct analysis of oils and extracts, detects micromolar epoxides, and clearly distinguishes epoxides from other oxidation products in lipids. Response curves were linear with concentration of epoxide standards, oxidized corn oil, and oxidized methyl linoleate (R2> 0.98). The DETC-HPLC and NMR assays hold the greatest promise for routine analysis of epoxides in oxidized lipids.M.S.Includes bibliographical referencesIncludes vitaby Chen-Hsiang Lia
[[alternative]]The Transpersonal Experience by Helping Others ---- one Tzu-Chi people as example
No full text[[abstract]]The Transpersonal Experience by Helping Others ----
one Tzu-Chi people as example
Hsiang-Ting Chen
Abstract
The purpose of this research was to explore the transpersonal experience in helping others through one Tzu-Chi people. This is a qualitative research. By using semi-structured interviewing guidances, the researcher performed one-by-one in-depth interviews twice, each time about two hours. Latter, the research used Moustakas’s phenomenological research methods to analyze data and perform results. The main results of this research are as follows :
1. In the co-researcher’s transpersonal experience, the wish of learning Kuan-Yin Bodhisattva’s spirits to love and benefit others guided all her movements.
2. Master Cheng-Yen presents mercy and wisdom as Kuan-Yin Bodhisattva. Cheng-Yen’s mercy touched the co-researcher, and wisdom helped her a lot.
3. Tzu-Chi people support and grow each other. Through their team-work, the co-researcher’s goal of helping others could be fulfilled.
4. In helping others, the co-researcher obtained growth and changes ---- the meaning and value of live been promoted. This supported her to help others continuously.
5. The co-researcher’s positive, diligent and modest learning attitude and serious, responsible working manners were the important factors which made the transcendence possible.
From above results, there are some important discoveries as follows :
1. In the transpersonal experience, self-growth and the transpersonal movement of helping others complement each other.
2. During the transpersonal experience, the self-autonomy guides person’s movement.
3. By helping people, individual’s body become more healthy, and his mind become more mercy, lighter and more abundant. The changes include body and mentality.
4. The factors which effects the happening of transpersonal experience could be summed up as below：believe factor, context factor and personal characteristics.
According to the results and discoveries of this research, the researcher provides some concrete suggestions in practice and future researches.
Cryptanalysis and improvement of chen-hsiang-shih's remote user authentication scheme using smart cards
Get PDFRecently, Chen-Hsiang-Shih proposed a new dynamic ID-based remote user authentication scheme. The authors claimed that their scheme was more secure than previous works. However, this paper demonstrates that theirscheme is still unsecured against different kinds of attacks. In order to enhance the security of the scheme proposed by Chen-Hsiang-Shih, a new scheme is proposed. The scheme achieves the following security goals: without verification table, each user chooses and changes the password freely, each user keeps the password secret, mutual authentication, the scheme establishes a session key after successful authentication, and the scheme maintains the user's anonymity. Security analysis and comparison demonstrate that the proposed scheme is more secure than Das-Saxena-Gulati's scheme, Wang et al.'s scheme and Chen-Hsiang-Shih.Peer ReviewedPostprint (published version
Cryptanalysis and improvement of chen-hsiang-shih's remote user authentication scheme using smart cards
No full textRecently, Chen-Hsiang-Shih proposed a new dynamic ID-based remote user authentication scheme. The authors claimed that their scheme was more secure than previous works. However, this paper demonstrates that theirscheme is still unsecured against different kinds of attacks. In order to enhance the security of the scheme proposed by Chen-Hsiang-Shih, a new scheme is proposed. The scheme achieves the following security goals: without verification table, each user chooses and changes the password freely, each user keeps the password secret, mutual authentication, the scheme establishes a session key after successful authentication, and the scheme maintains the user's anonymity. Security analysis and comparison demonstrate that the proposed scheme is more secure than Das-Saxena-Gulati's scheme, Wang et al.'s scheme and Chen-Hsiang-Shih.Peer Reviewe
Cryptanalysis and improvement of chen-hsiang-shih's remote user authentication scheme using smart cards
Get PDFRecently, Chen-Hsiang-Shih proposed a new dynamic ID-based remote user authentication scheme. The authors claimed that their scheme was more secure than previous works. However, this paper demonstrates that theirscheme is still unsecured against different kinds of attacks. In order to enhance the security of the scheme proposed by Chen-Hsiang-Shih, a new scheme is proposed. The scheme achieves the following security goals: without verification table, each user chooses and changes the password freely, each user keeps the password secret, mutual authentication, the scheme establishes a session key after successful authentication, and the scheme maintains the user's anonymity. Security analysis and comparison demonstrate that the proposed scheme is more secure than Das-Saxena-Gulati's scheme, Wang et al.'s scheme and Chen-Hsiang-Shih.Peer ReviewedPostprint (published version
Supplemental Material - Evaluation of the Psychometric Properties of a Newly Developed Chinese Screening Tool for Speech Disorders in Patients With Parkinson’s Disease
No full textSupplemental Material for Evaluation of the Psychometric Properties of a Newly Developed Chinese Screening Tool for Speech Disorders in Patients With Parkinson’s Disease by Chi-Lin Chen, Ching-Huang Lin, Chen-San Su, Hsiang-Chun Cheng, Li-Mei Chen, Rong-Ju Cherng in Evaluation & the Health Professions</p
Asymmetric heterometal string complexes: stereochemical control of the unique isomer of (4,0)[CuCuPd(npa)4Cl][PF6] and (4,0)[CuCuPt(npa)4Cl][PF6]
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