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排序方式: 共有330条查询结果,搜索用时 15 毫秒
31.
CHARLES R. BARMORE 《Journal of food quality》1987,10(3):207-217
Flexible plastic packaging in the fresh produce industry has functioned in the past to facilitate product handling and provide brand identification. Greater emphasis on freshness and product quality has resulted in a re-evaluation of plastic for fresh and minimally processed products. Polyvinylchloride, used primarily for overwrapping, and polyethylene, used for bags, have been the most popular films, but co-extrusion technology has provided a means of controlling gas transmission rates. Individual film wrapping represents a rediscovery of an old technique that has applications in prevention of shrinkage and altering of ripening patterns. Modified atmosphere packaging and value added products represent other new technologies that use packaging to extend shelf-life. 相似文献
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Deregulation of the electricity industry aims for creating a competitive market to trade electricity, which generates a host of new technical challenges among market participants and power system researchers. One of the major challenges is to establish a cost for system services on a non-discriminatory basis. In this paper, the evaluation of transmission cost is proposed based on sensitivity factor method like AC Power Transfer Distribution Factor (ACPTDF) method for bilateral and multilateral transactions. The transacted power is estimated by ACPTDF method for each transaction. The advantages of the proposed methodology are demonstrated on a sample 6 bus, IEEE 30 bus and Indian Utility 69 bus systems. The solution provides a better pricing approach that can impact a more reasonable economic indicator for transmission cost. 相似文献
33.
ELVIRA G. DE MEJIA CHARLES N. HANKINS OCTAVIO PAREDES-LOPEZ LELAND M. SHANNON 《Journal of Food Biochemistry》1990,14(2):117-126
High levels of lectin activity were found in sixty cultivated and ten wild tepary (Phaseolus acutifolius) accessions. No lectin deficient varieties were observed and all examples studied contained both the phytohemagglutinin-E and L-like lectins previously described (Pusztai et al. 1987). There appeared to be no obvious differences between the wild and cultivated forms of the tepary lectins and all teparies studied contained lectin-like proteins in addition to the tepary lectins. One of the lectin related proteins (40 Kdalton subunit) was present in all teparies and may be comparable to arcelin, a lectin found in certain wild accessions of Phaselus vulgaris. All wild teparies contained a lectin related polypeptide of about 34 Kdaltons which appears to distinguish the wild teparies from the cultivated forms. Three tepary-common bean hybrids were examined and one hybrid was found to be expressing both tepary and common bean lectin genes. 相似文献
34.
RHEOLOGICAL AND CHEMICAL PROPERTIES OF MOZZARELLA CHEESE 总被引:1,自引:0,他引:1
J. JOSEPH YUN YIN LIANG HSIEH DAVID M. BARBANO CHARLES L. ROHN 《Journal of texture studies》1994,25(4):411-420
Dynamic viscoelastic parameters and chemical properties of Mozzarella cheese produced using a "no-brine" cheese making method with 3 different cooking temperatures (38, 41, and 44C) were determined. Samples were stored for 3 weeks at 4C before dynamic mechanical analysis at 22C. G', G" and tan δ were 5.8 – 6.4 × 105 dyne/cm2 , 1.9 – 2.1 × 105 dyne/cm2 , and 0.33 – 0.35, respectively, at 1% strain and 10 rad/s. The percentage of intact αs -casein and β-casein were 38–40% and 33–35% of total protein in the cheese, respectively. The range of cooking temperatures used in this experiment had little effect on dynamic viscoelastic properties or the amount of intact protein for the cheese. 相似文献
35.
Nucleotides from fruit of "Orlando" tangelo (Citrus reticulata x C. paradisz) and "Hamlin" and "Pineapple" sweet oranges (C. sinensis) extracted with perchloric acid, were separated by anion-exchange chromatography using formic acid:aqueous ammonium formate as the eluting solvent. Tentative identification of the various fractions was made by comparing the retention time of unknowns with standards fractionated by the same procedure and by adsorption spectral analyses. With the use of these methods, acid-soluble nucleotides were found to be present in appreciable quantities in mature fruit. Those in concentration that could be tentatively identified were CMP, AMP, CDP, UMP, ADP, CTP, GDP, UDP and ATP. The latter was further assayed by the luciferin-luciferase method. The possible significance of the nucleotides to fruit quality was discussed. 相似文献
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AFACTOR ANALYSIS OF SELF-ESTEEM ITEMS FOR 298 UNDERGRADUATES YIELDED 5 IDENTIFIABLE FACTORS: COMMUNICATIVE PROPENSITY, OTHER-ANXIETY, NEGATIVE SELF-EVALUATION, POSITIVE SELF-EVALUATION, AND OTHER-CERTAINTY. A FACTOR ANALYSIS OF 272 UNDERGRADUATES' RESPONSES TO SELECTED SELF-ESTEEM ITEMS, AS WELL AS ADDITIONAL ITEMS, YIELDED SIMILAR FACTOR STRUCTURE. HOWEVER, SEPARATE ANALYSIS OF THE FEMALE DATA REVEALED THAT THE NEGATIVE SELF-EVALUATION AND OTHER-CERTAINTY FACTORS FORMED A SINGLE DIMENSION, SUGGESTING THAT PART OF FEMALES' SELF-EVALUATION DEPENDS ON CERTAINTY OF PEER APPROVAL. THIS RELATIONSHIP DOES NOT APPEAR FOR MALES. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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THE FLOW OF INFORMATION EXCHANGE AMONG 21 PSYCHOLOGICAL JOURNALS, AS INDEXED BY RECIPROCAL CITATION FREQUENCIES, WAS STUDIED AS A COMMUNICATION NETWORK BY THE APPLICATION OF INFORMATION THEORY AND OTHER STATISTICS. JOURNALS BEING CITED WERE TREATED AS SOURCES OF INFORMATION WITHIN THE NETWORK AND JOURNALS DOING THE CITING WERE TREATED AS DESTINATIONS OF INFORMATION. THE CHARACTERIZATION OF THIS NETWORK, FOR 1959 AND 1960, WAS IN TERMS OF SUCH MEASURES AS: TRAFFIC (NUMBER OF MESSAGES EXCHANGED), CONGRUENCE (CORRELATIONS BETWEEN SOURCE AND DESTINATION PROBABILITIES), FEEDING VS. STORING FUNCTIONS (RATIOS OF BEING CITED TO CITING), SELF-FEEDING (SELF-CITATION OF JOURNALS), SOURCE AND DESTINATION BALANCES (ENTROPY MEASURES, H, FOR BEING CITED AND CITING ACROSS THE NETWORK), AND NETWORK ORGANIZATION (CONDITIONED PREDICTABILITY OF DESTINATION JOURNAL GIVEN SOURCE JOURNAL). DISTANCE MEASURES WERE APPLIED TO CHARACTERIZE THE STRUCTURE OF THE NETWORK (WHICH JOURNALS ARE CLOSE TO OTHERS IN TERMS OF RECIPROCAL CITATION) IN BOTH 1950 AND 1960. THUMBNAIL SKETCHES OF THE FUNCTIONING OF EACH JOURNAL WITHIN THE NETWORK, IN TERMS OF THESE MEASURES, ARE PRESENTED. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献