Biomolecular characterization,identification, enzyme activities of molds and physiological changes in sweet potatoes (<Emphasis Type="Italic">Ipomea batatas</Emphasis>) stored under controlled atmospheric conditions     

C. O. Oladoye  I. F. Connerton  R. M. O. Kayode  P. F. Omojasola  I. B. Kayode 《Journal of Zhejiang University. Science. B》2016,17(4):317-332

Microbial attacks during storage are one of the primary causes of product deterioration, and can limit the process of prolonging the shelf-life of harvested food. In this study, sweet potatoes were stored at temperatures of 13, 21, and 29 °C for 4 weeks. Samples were collected during storage and plated on potato dextrose agar, from which axenic mold cultures were obtained and identified using 26S rRNA gene sequences. Physiological changes of potato tubers were assessed with respect to pathogenicity, enzyme activity, and atmospheric storage conditions. Six fungal species were identified, namely Penicillium chrysogenum (P. rubens), P. brevicompactum, Mucor circinelloides, Cladosporium cladosporiodes, P. expansum, and P. crustosum. The following fungal isolates, namely P. expansum, P. brevicompactum, and Rhizopus oryzae, were recovered from the re-infected samples and selected according to their levels of enzyme activity. This study revealed high levels of activity for cellulase and pectinase, which were most notable during the initial three days of testing, and were followed by a steady decrease (P<0.05). Polygalacturonase activity was prominent with values ranging from 12.64 to 56.79 U/mg (P. expansum) and 18.36 to 79.01 U/mg (P. brevicompactum). Spoilage was obvious in the control group, which had a 100% decay at the end of the experimental period compared with samples treated with iprodione and sodium hypochlorite, in which the decay rates were 5% and 55%, respectively. The data for the iprodione- and sodium hypochlorite-treated samples at the end of the 3-month storage period showed that they were significantly different (P=0.041), with the sodium hypochlorite-treated samples producing twice the rate of infection compared to the iprodione-treated samples. The comparative rate of the progression of decay in the treated samples can be expressed as iprodione<sodium hypochlorite<control. This study demonstrates that sweet potato tissue damage is due to the activities of microbial enzymes and, in particular, the pectinases of the organisms isolated from the infected potato tissues, and suggests the advantages of utilizing iprodione as a curing agent for potato tubers before storage.  相似文献   

Assessing alignment between information technology educational opportunities,professional requirements,and industry demands     

Marcia A. Mardis  Jinxuan Ma  Faye R. Jones  Chandrahasa R. Ambavarapu  Heather M. Kelleher  Laura I. Spears  Charles R. McClure 《Education and Information Technologies》2018,23(4):1547-1584

Information technology (IT) and computing are growing fields, offering far more job opportunities than applicants. Yet, little data are available to indicate how course content, employer needs, and additional learning opportunities work together the prepare graduates to enter the IT workforce. To understand the extent to which learners were prepared to for these highly technical careers, we used text analysis to examine the extent to which course syllabi, job postings, internship postings, and industry certifications from information technology preparation programs at state college and two universities commonly reflected national IT curriculum knowledge areas. Integrated data suggested that while the two-year and four-year programs imparted key technical skills, to qualify employers sought applied, or “soft,” skills such as critical thinking, problem solving, teamwork, and written and verbal communication. These soft skills were more difficult to detect as learning outcomes, but the determination of the extent to which the examined programs foster these skills presents a fertile area for subsequent research.  相似文献   

The Pitfalls of Differentiation in the Financing of Russian Universities     

I.V. Abankina  T.V. Abankina  L.M. Filatova 《Russian Education & Society》2018,60(2):101-132

Study objective: To identify the causes and consequences of the growing stratification of universities in terms of the volumes and sources of funding that they have access to as well as in the programs of study that they offer.

Methods: We used statistical and economic analysis to study the outcomes of university activity. We assessed the interrelationships between the resource base of higher education and the production and economic potential of the Russian regions through the application of an econometric model. We also conducted an empirical analysis of the factors that are influencing the increasing public demand for higher education.

Results: We identified trends in how the demand for higher education has structurally changed between 2001 and 2014. We assessed how sources of funding at universities differ from region to region given the transition to the performance-based contract model. We identified the main risks (pitfalls) associated with the structural misalignment of the demand for higher education and the proposed quotas for public scholarship-funded seats in various fields of study. This process is unfolding against a background of increasing regional differentiation, which is contributing to the stratification of Russian universities in terms of the volumes and sources of their financial support and heightened financial obligations caused by raising the salaries of faculty members and leading to a shortage of funds that are available for facilities maintenance as well as supporting the learning process. This latter factor jeopardizes the quality of educational programs.

Findings: We were able to identify trends in how the demand for higher education is structurally changing in Russian higher education on the basis of an empirical analysis that was carried out using an econometric model. We assessed the impact of the global economic crisis and the effective ability of families to pay for higher education. We also identified the risks (pitfalls) that result from the regional differences in university funding .

Practical significance: Specialists may apply the main arguments and conclusions of the article in the field of economics and management when drafting university financial plans and development strategies.  相似文献   

Enhancing transfer of learning through post-course reflection     

Sarah I. Leberman  Andrew J. Martin 《Journal of Adventure Education & Outdoor Learning》2004,4(2):173-184

This article investigates how a structured post-course follow-up reflection activity affects the depth of reflection and facilitates the transfer of learning. The research is reflective, based on the findings from the Action Learning Management Practicum, a 3^rd year paper at Massey University, New Zealand. The initial reflections at the end of the course generally went no deeper than students “noticing”, or “making sense” of the experiences. With the benefit of distance and time away from the course, the students' reflection was deep and insightful. The findings suggest that the post-course reflection activity enables participants to “make meaning” from their experiences with the benefit of time and distance from the initial post-course reflection, thus enhancing the transfer of learning. The article argues for an extension and adaptation to Kolb's “Experiential Learning Cycle” model in relation to the time of reflection based on the empirical evidence provided.  相似文献   

Using humour in counselling mentally retarded clients: A preliminary study     

I. F. W. K. Davidson  W. I. Brown 《International journal for the advancement of counseling》1989,12(2):93-104

The effects of using two types of humour in counselling sessions with mentally retarded clients were examined. Eleven male and eleven female mildly handicapped participants rated the helpfulness of a male counsellor following in vivo counselling sessions where no humour (NH), facilitative humour (FH), and non-facilitative humour (NFH) were used. Results indicated that overall participants' ratings were significantly higher under the FH condition than when either NH or NFH were used. No overall effects were found for gender type, but analysis of intra-individual rating patterns indicated that ratings varied considerably among both male and female participants.  相似文献   

A comparison of types of attorney representation for children in California juvenile court dependency cases     

Goodman GS  Edelstein RS  Mitchell EB  Myers JE 《Child abuse & neglect》2008,32(4):497-501

OBJECTIVE: The present study concerns types of attorney representation for maltreated children involved in juvenile court actions in the state of California. The aims of the research were to document the different types of representation used in dependency cases in 2000 (e.g., public defender, District Attorney, private firms) and to evaluate these types of representation with respect to children's experiences in foster care. METHODS: Every county in California was surveyed about the predominant type of legal representation used in their dependency court system. In addition, data on children's experiences in foster care were obtained from the Child Welfare System/Child Management System (CWS/CMS). RESULTS: Findings indicate that, in the majority of counties in California, children were represented by the public defender's office or by a panel of court-appointed attorneys. Approximately equal numbers of counties employed county-affiliated (i.e., District Attorney, public defender, county counsel) and independent (i.e., private firm, panel of court-appointed attorneys) types of representation (47% and 52%, respectively). Further analyses suggested that children in counties employing independent types of representation tended to experience fewer foster-care placements than did children in counties employing county-affiliated types of representation. This relation remained significant when potentially confounding variables were statistically controlled. CONCLUSION: Results indicated that some types of representation, specifically, private firms and court-appointed attorneys, were associated with one better outcome for children.  相似文献   

On the Distinction between False Belief Understanding and Subscribing to an Interpretive Theory of Mind   总被引：10，自引：2，他引：10  

Jeremy I. Carpendale  Michael J. Chandler 《Child development》1996,67(4):1686-1706

2 groups of 5–8-year-olds were examined in an effort to explore the developing relations between false belief understanding and an awareness of the individualized nature of personal taste, on the one hand, and, on the other, a maturing grasp of the interpretive character of the knowing process. In Study 1, 20 children between 5 and 8 all behaved in accordance with hypotheses by proving to be indistinguishable in their already good grasp of the possibility of false beliefs and in their common assumption that differences of opinion concerning matters of taste are legitimate expressions of personal preferences. By contrast, only the 7- and 8-year-old children gave evidence of recognizing that ambiguous stimuli especially allow for warrantable differences of interpretation. Study 2 replicated and extended these findings with a group of 48 5-8-year-old subjects, again showing that while 5-year-olds easily pass a standard test of false belief understanding, only children of 7 or 8 ordinarily evidence an appreciation of the interpretive character of the knowing process.  相似文献   

Masking of Children's Early Understanding of the Representational Mind: Backwards Explanation versus Prediction   总被引：3，自引：0，他引：3  

E. J. Robinson  P. Mitchell 《Child development》1995,66(4):1022-1039

3–5-year-olds heard a story involving identical twins, one of whom was absent when their ball was moved from one drawer to another. Children found it easy to infer that the twin who later went to the original location to get the ball was the one who had gone outside. Children in a comparison condition found it relatively difficult to predict where a (nonidentical) twin who was absent when the ball was moved, would search for the ball, and made the usual realist error. In further investigations involving variations on the identical twins task, children were equally successful at making the link between looking in the wrong place and having been absent, whether a backwards inference was required (as above) or a forwards one (inferring that the twin who went outside must now be the one who was at the wrong location). We ruled out one twin's physical association with the correct location as an artifactual explanation for facilitation. Children performed well whether or not the experimenter told them explicitly which twin did not know the ball had been moved. These findings support the view that children's early insight into the representational character of mind is masked in traditional prediction tests of false belief.  相似文献   

Ant colony system algorithm for the optimization of beer fermentation control     

肖杰  周泽魁  张光新 《Journal of Zhejiang University. Science. B》2004,(12)

Beer fermentation is a dynamic process that must be guided along a temperature profile to obtain the desired results. Ant colony system algorithm was applied to optimize the kinetic model of this process. During a fixed period of fermentation time, a series of different temperature profiles of the mixture were constructed. An optimal one was chosen at last. Optimal temperature profile maximized the final ethanol production and minimized the byproducts concentration and spoilage risk. The satisfactory results obtained did not require much computation effort.  相似文献   

The effects of compound stimulus preexposure of two elements differing in salience on the acquisition of conditioned suppression     

R. E. Lubow  M. Wagner  I. Weiner 《Learning & behavior》1982,10(4):483-489

Conditioned attention theory (CAT) of latent inhibition (LI) states that parallel learning processes occur during reinforced and nonreinforced stimulus presentation. The present experiments investigated the effects of nonreinforced preexposure of either a compound CS or elements of that compound which differed in salience. Three predictions were advanced: (1) Both the compound and its elements will show an increase in LI as a function of the number of preexposures; (2) the two elements will show different levels of LI, with more LI accruing to the more salient element; (3) overshadowing will occur during compound preexposure. Two experiments, using rats as subjects and a conditioned suppression test, are reported. In Experiment 1, groups received 0, 20, 40, or 80 nonreinforced preexposures to a compound whose elements differed in salience. The results of the subsequent test confirmed predictions 1 and 2. Experiment 2, in which groups were preexposed to either the elements or the compound, provided evidence for an overshadowing effect, confirming prediction 3 from CAT.  相似文献