Effect of Product Price, Interest Rates and Forestry Incentives on Financial Returns from Arkansas\u27 Nonindustrial Private Forests

As the U.S. population increases, demand for Arkansas\u27 forest production will continue to increase. Nonindustrial private forests (NIPF) will be increasingly relied upon to meet future demand. Restocking following harvest and good forest management techniques have not always been practiced on NIPF lands. Federal cost sharing programs exist which encourage investment in forestry; federal programs may pay up to half of establishment and management costs. Special federal capital gains treatment and other tax incentives also exist for nonindustrial landowners; however, nonindustrial use of incentives is not great. Models were developed to determine whether actual stumpage prices and existing economic incentives were sufficient to cover the investment cost of establishment and owning and holding the stand. Using site indexes of 70 and 80 (base 50) for loblolly pine plantations, stand value and opportunity costs were compared annually over the life of a 40 year rotation. Long-term U.S. Treasury Bond rates and a flat 6% rate of return were used to estimate opportunity costs on an after tax basis. Investment costs were estimated with and without using existing economic incentives. Results show that if front-end costs of establishment are low, stand value is virtually certain to be greater than opportunity costs. This was true even on low site index tracts with high opportunity costs. Without incentives, investment success is subject to stumpage price fluctuations especially when high opportunity costs are in place. Policy recommendations include increasing present efforts to inform NIPF landowners of incentive opportunities to encourage development of private forest resources. If private landowners have the proper information, they are more likely to improve their personal situation and enhance forest productivity

Making the Most of Interim Assessment Data: Lessons from Philadelphia

Under No Child Left Behind, urban school districts have increasingly turned to interim assessments, administered at regular intervals, to help gauge student progress in advance of annual state exams. These assessments have spawned growing debate among educators, assessment experts, and the testing industry: are they worth the significant investment of money and time? In Making the Most of Interim Assessment Data: Lessons from Philadelphia, Research for Action (RFA) weighs in on this issue. The School District of Philadelphia (SDP) was an early adopter of interim assessments, implementing the exams in 2003. Unlike teachers in some other regions, Philadelphia elementary and middle grades teachers rated these 'Benchmark' assessments highly. However, the study found that enthusiasm did not necessarily correlate with higher rates of student achievement. What did predict student success were three factors -- instructional leadership, collective responsibility, and use of the SDP's Core Curriculum. The report underscores the value of investment in ongoing data interpretation that emphasizes teachers' learning within formal instructional communities, such as grade groups of teachers. This research was funded by the Spencer Foundation and the William Penn Foundation

Developing Communities of Instructional Practice: Lessons From Cincinnati and Philadelphia

Over the past several years, education reformers have increasingly invested in the development of communities within schools as a central strategy to improve teaching and student learning. These communities come in various guises, including small schools, small learning communities, and teacher teams. Two assumptions about how these communities will enhance the quality of instruction underlie the push for these more intimate learning environments. First, supporters believe that teachers will get to know their students better and therefore be more able to respond to students’ learning needs. Second, advocates contend that small communities will encourage teachers to collaborate more in order to improve their instructional practices. Thus, the theory of action underlying the development of teacher communities is that the fostering of these kinds of teacher communities will instigate improvements in the quality of instruction, which will lead to enhanced student learning. This issue of CPRE Policy Briefs examines the merit of these assumptions and the conditions under which communities of teachers can improve their instructional practices and bring about enhanced student learning. The lessons for policymakers contained in this Brief come from large-scale evaluations of two major district reform initiatives — one in Philadelphia, Pennsylvania and the other in Cincinnati, Ohio — that were designed to foster the development of instructionally focused communities. The research from these two very different settings indicates that only under certain conditions will teacher communities flourish into communiDeveloping Communities of Instructional Practice: Lessons from Cincinnati and Philadelphia By Jonathan A. Supovitz and Jolley Bruce Christman ties engaged in instructional improvement. The findings suggest that in order for an investment in communities to pay off in widespread improvement in student learning, particular kinds of teacher communities are needed: those that are focused on improving the instructional core of schooling and provided with the necessary strategies, structures, and supports. With more specific guidance that helps teachers to hone their instructional craft knowledge, policymakers can foster communities of instructional practice

Effective Organizational Practices for Middle and High School Grades

At the request of the Accountability Review Council, Research for Action identified effective organizational practices used by better performing schools serving substantial numbers of low income middle and high school students in the School District of Philadelphia. These practices are organized into three spheres: Conditions for Teaching, Student-Centered School Community, and Instructional Program. For each sphere, the report offers broad strategies and specific practices to enact the strategies. Nuanced school case studies show how the practices can work synergistically and coherently in schools to help students succeed

Particle movement in a boundary layer

The study here is concerned with a thin solid body passing through a boundary layer or channel flow and interacting with the flow. Relevant new features from modelling, analysis and computation are presented along with comparisons. Three scenarios of such fluid-body interactive evolution in two-dimensional settings are considered in turn, namely a long body translating upstream or downstream, a long body with little or no translation and a short body with or without translation. The main progress and findings concern predictions of the time taken by the body to traverse the flow and impact upon the underlying wall, the delicate behaviour at the onset of impact, the dependence on parameters such as the initial conditions and the mass and shape of the body, and the influence of streamwise translation of the body in the surrounding fluid flow

High hopes for cannabinoid agonists in the treatment of rheumatic diseases

There are two well-characterised isoforms of cannabinoid receptor; CB(1) and CB(2) and of these CB(2) is under active investigation as a potential target for treatment of the chronic pain associated with widespread and intractable joint diseases osteoarthritis and rheumatoid arthritis. The recent report by Fukuda et al (BMC Musculoskelet Disord15: 275, 2014) in BMC Musculoskeletal Disorders investigates the efficacy of a selective CB(2) agonist, JW133, in both in vitro and in vivo models of rheumatoid arthritis and provides encouraging data. The report shows that JW133 inhibits expression of the CCL2 cytokine, osteoclastogenesis and reduces histological indicators of joint degeneration. Each of these could potentially contribute to beneficial analgesic effects in a therapeutic context. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/1471-2474-15-410) contains supplementary material, which is available to authorized users

The domestication of the probiotic bacterium Lactobacillus acidophilus

Lactobacillus acidophilus is a Gram-positive lactic acid bacterium that has had widespread historical use in the dairy industry and more recently as a probiotic. Although L. acidophilus has been designated as safe for human consumption, increasing commercial regulation and clinical demands for probiotic validation has resulted in a need to understand its genetic diversity. By drawing on large, well-characterised collections of lactic acid bacteria, we examined L. acidophilus isolates spanning 92 years and including multiple strains in current commercial use. Analysis of the whole genome sequence data set (34 isolate genomes) demonstrated L. acidophilus was a low diversity, monophyletic species with commercial isolates essentially identical at the sequence level. Our results indicate that commercial use has domesticated L. acidophilus with genetically stable, invariant strains being consumed globally by the human population

Changes in serogroup and genotype prevalence among carried meningococci in the United Kingdom during vaccine implementation.

BACKGROUND: Herd immunity is important in the effectiveness of conjugate polysaccharide vaccines against encapsulated bacteria. A large multicenter study investigated the effect of meningococcal serogroup C conjugate vaccine introduction on the meningococcal population. METHODS: Carried meningococci in individuals aged 15-19 years attending education establishments were investigated before and for 2 years after vaccine introduction. Isolates were characterized by multilocus sequence typing, serogroup, and capsular region genotype and changes in phenotypes and genotypes assessed. RESULTS: A total of 8462 meningococci were isolated from 47 765 participants (17.7%). Serogroup prevalence was similar over the 3 years, except for decreases of 80% for serogroup C and 40% for serogroup 29E. Clonal complexes were associated with particular serogroups and their relative proportions fluctuated, with 12 statistically significant changes (6 up, 6 down). The reduction of ST-11 complex serogroup C meningococci was probably due to vaccine introduction. Reasons for a decrease in serogroup 29E ST-254 meningococci (from 1.8% to 0.7%) and an increase in serogroup B ST-213 complex meningococci (from 6.7% to 10.6%) were less clear. CONCLUSIONS: Natural fluctuations in carried meningococcal genotypes and phenotypes a can be affected by the use of conjugate vaccines, and not all of these changes are anticipatable in advance of vaccine introduction

The Effect of Salt and Pyrophosphate on the Structure of Meat

Our obective was to determine whether or not salt and pyrophosphate have the same effect on the structure of pieces of meat as they have on isolated myofibrils. Blocks of pig M. longissimus dorsi were incubated in solutions of sodium chloride at pH 5.5 or sodium chloride plus sodium pyrophosphate at pH 5.5 or 8.0. The blocks were obtained from fresh (24h post- mortem) or aged (72h post-mor tem) muscle and incubated for 5 or 24h with minimal agitation. There was considerable uptake of water by the tissue especially at the higher pH and longer times. Electron microscopy of the meat incubated in salt plus pyrophosphate at pH 8.0 revealed complete or nearly complete extraction of the A-band to a depth of at least one fibre from the surface. In meat incubated in salt plus pyrophosphate at pH 5.5 the extraction of the A-band was 1 ess complete and appeared to occur only near the surface. In salt alone no extraction of the A-band occurred. Swelling of myofibrils close to the surface could be detected either by a reduction of density or by greater separation of filaments . Break-up of the Z-line, probably due to mechanical disruption imposed by swelling of myofibrils, was a common feature of the salt treatments. Mitochondria near the surface were grossly swollen, especially with salt plus pyrophosphate at pH 8.0 At low pH amorphous material was observed inside and outside the cell membrane, but at high pH filamentous material was present in these areas