A comparison study of public school kindergarten and second grade free-hand drawings using a prepared art scale

Thesis (Ed.M.)--Boston Universit

Associations between dietary added sugar intake and micronutrient intake: a systematic review

Original article can be found at: http://journals.cambridge.org/ Copyright The Authors. DOI: 10.1017/S0007114507617206There is increasing concern that high intakes of added sugars might compromise intakes of micronutrients. The objectives of this systematic review were (1) to determine whether dietary added sugar intake was associated with micronutrient intakes, and if so, whether there was evidence of micronutrient dilution as a result of higher dietary added sugar intake and (2) if micronutrient dilution was present, to determine whether there was sufficiently robust evidence to support a threshold effect above which there was a significant decline in micronutrient intake or status relative to the recommended intakes. A systematic computerised literature search was undertaken, limited to studies written in English published from 1980 onwards and further studies identified through hand searching papers. Fifteen studies that assessed associations between intakes of added sugars or non-milk extrinsic sugars and micronutrients were included. Overall, there are insufficient data and inconsistency between studies in relationships between added sugars and micronutrient intakes, with no clear evidence of micronutrient dilution or a threshold for a quantitative amount of added sugar intake for any of the micronutrients investigated. The current evidence base is considerably constrained by methodological issues. Further research is required to determine which food products high in added sugars might adversely affect micronutrient intakes by displacing other food items from the diet. Analyses should take into account the magnitude of any observed associations to determine their true biological significance.Peer reviewe

The Shadow Cost of Parking Minimums: Evidence from Los Angeles County

Minimum Parking Requirements (MPRs) are almost universal in U.S. cities and common in the rest of the world. In the U.S., parking requirements for commercial buildings commonly require 700 ft2 of parking for each 1000 ft2 of floor space. To the extent this is a binding requirement, MPRs could result in distortion in commercial development. MPRs require either the allocation of land for parking, or very costly substitution of structured parking for land. Therefore, MPR distortions are likely to increase with the value of land. A steep gradient in the cost of the MPRs leads to the possibility that MPR costs could be high enough to change where developers find it profitable to locate commercial development. In particular, MPR costs may be high enough in dense, high land-value areas to discourage development or move it to outlying areas. We use a Mixed Geographically Weighted Regression (MGWR) approach to estimate a hedonic specification using sales of office properties in Los Angeles County. This approach allows local variation in the estimates of marginal values of key parameters, including the value of on-site parking. To control for unobservables, we use the Linn (2013) method to incorporate pre-period prices into the MGWR estimator. Then we use these hedonic estimates plus locally-specific estimates of parking costs to estimate the cost of MPRs on a property by property basis. We check the robustness of the results by comparing our estimated costs to the in-lieu-of-parking fees that are offered by some of the cities in our sample. Our estimates of MPR costs are close to these market values for escaping the parking requirement. Our results show a significant gradient in MPR costs. Smaller properties in dense, high land value areas in Los Angeles can have MPR costs that amount to about 30% of building construction costs while properties in outlying areas often do not have binding MPRS. This gradient is likely to be sufficient to move development from high land value, dense, city centers into lower value areas. Our suite of methods could be applied to other building and zoning regulation, such as height regulation and inclusionary housing where the cost gradient is also likely to be important

Behavioral Evidence for Chemosensory and Thermosensory Pathway Convergence in the Caenorhabditis Elegans Nervous System

The nematode, Caenorhabditis elegans, is an established model system to explore the ways simple nervous systems detect and direct organismal responses to environmental changes. C. elegans possesses specialized receptor cells for the detection of a variety of environmental stimuli. Separate cell types respond to volatile chemical and thermal stimuli and the neural pathways for these show anatomical evidence of convergence. This work reports findings from behavioral assays during simultaneous exposure of nematodes to both thermal differences and attractant volatile chemicals. Combined exposure to benzaldehyde and cold neutralized the behavioral responses to both stimuli in 24°C acclimated worms. Diacetyl and mild thermal stimulation produced the same effect with 16°C acclimated worms. Benzaldehyde appears to interfere with thermophilic circuitry while diacetyl acts similarly with cryophilic circuitry

Study of Intensive Human Relations Iaboratory Experiences upon Student Teacher Perception and Treatment of Behavioral Problems of Elementary School Children

Elementary Educatio

Comparison of Extension Personnel and Supervisor Perceptions of Communications Activities

Extension is often called the “best-kept secret” having low awareness with the public but high satisfaction with clientele. Extension services nationwide have faced budget cuts, creating a need for the organization to re-evaluate its activities, including how it communicates with its stakeholders. While Extension personnel are the ones who will do most of the communicating, their supervisors impact the personnel’s actions, which means it is important to assess both groups. A survey was conducted with Extension personnel and their supervisors in Mississippi assessing engagement in communications activities and perceptions of those activities, as well as personnel’s preference of professional development activities. Personnel reported higher use, comfort, and importance of more traditional (e.g. making a speech) and written activities (e.g. writing a promotional handout) than media-relations activities (e.g. being interviewed for TV), social media-related activities (e.g. managing a Twitter account), and visual communication activities (e.g. graphic design). Supervisors perceived individual communications activities as less important overall than personnel did, and although supervisor and communication scores for use and comfort/capability were similar for most communication activities, there were noticeable exceptions. Additionally, personnel preferred professional development activities that were hands-on or showing the activities first-hand (e.g. demonstrations and field days). Future research should be expanded to other states, conducted in a case study format to study specific relationships, and involve qualitative components. Extension should ensure clear supervisor-communication dialogue on prioritizing communication activities, provide training on communication activities with low use and comfort, and utilize early innovators who are comfortable using newer communication activities

DICER-LIKE2 plays a primary role in transitive silencing of transgenes in Arabidopsis.

Dicer-like (DCL) enzymes play a pivotal role in RNA silencing in plants, processing the long double-stranded RNA (dsRNA) that triggers silencing into the primary short interfering RNAs (siRNAs) that mediate it. The siRNA population can be augmented and silencing amplified via transitivity, an RNA-dependent RNA polymerase (RDR)-dependent pathway that uses the target RNA as substrate to generate secondary siRNAs. Here we report that Arabidopsis DCL2-but not DCL4-is required for transitivity in cell-autonomous, post-transcriptional silencing of transgenes. An insertion mutation in DCL2 blocked sense transgene-induced silencing and eliminated accumulation of the associated RDR-dependent siRNAs. In hairpin transgene-induced silencing, the dcl2 mutation likewise eliminated accumulation of secondary siRNAs and blocked transitive silencing, but did not block silencing mediated by primary siRNAs. Strikingly, in all cases, the dcl2 mutation eliminated accumulation of all secondary siRNAs, including those generated by other DCL enzymes. In contrast, mutations in DCL4 promoted a dramatic shift to transitive silencing in the case of the hairpin transgene and enhanced silencing induced by the sense transgene. Suppression of hairpin and sense transgene silencing by the P1/HC-Pro and P38 viral suppressors was associated with elimination of secondary siRNA accumulation, but the suppressors did not block processing of the stem of the hairpin transcript into primary siRNAs. Thus, these viral suppressors resemble the dcl2 mutation in their effects on siRNA biogenesis. We conclude that DCL2 plays an essential, as opposed to redundant, role in transitive silencing of transgenes and may play a more important role in silencing of viruses than currently thought