Assay of proteolytic enzyme(s) from Neurospora crassa

Assay of proteolytic enzyme(s) from Neurospora crass

Minimum-weight triangulation is NP-hard

A triangulation of a planar point set S is a maximal plane straight-line graph with vertex set S. In the minimum-weight triangulation (MWT) problem, we are looking for a triangulation of a given point set that minimizes the sum of the edge lengths. We prove that the decision version of this problem is NP-hard. We use a reduction from PLANAR-1-IN-3-SAT. The correct working of the gadgets is established with computer assistance, using dynamic programming on polygonal faces, as well as the beta-skeleton heuristic to certify that certain edges belong to the minimum-weight triangulation.Comment: 45 pages (including a technical appendix of 13 pages), 28 figures. This revision contains a few improvements in the expositio

By-product utilization for animal production : proceedings of a workshop on applied research held in Nairobi, Kenya, 26-30 Sept. 1982

Meeting: By-product Utilization for Animal Production, 26-30 Sept. 1982, Nairobi, KEReviews research achievements that are technically and economically feasible for practical application in animal feeding systems, and recommends research methodologies

The question of access to the Japanese market

This survey focuses on the question of how market structure and different corporate organisational forms might affect access to the Japanese market for industrial goods. The question is how and whether keiretsu corporate structures in Japan constitute an important unofficial barrier in access to the Japanese market for manufactured goods

Review of the analysis of Th-234 in small volume (2-4 L) seawater samples: improvements and recommendations

© The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Clevenger, S. J., Benitez-Nelson, C. R., Drysdale, J., Pike, S., Puigcorbe, V., & Buesseler, K. O. Review of the analysis of Th-234 in small volume (2-4 L) seawater samples: improvements and recommendations. Journal of Radioanalytical and Nuclear Chemistry, 329(1), (2021): 1–13, https://doi.org/10.1007/s10967-021-07772-2.The short-lived radionuclide 234Th is widely used to study particle scavenging and transport from the upper ocean to deeper waters. This manuscript optimizes, reviews and validates the collection, processing and analyses of total 234Th in seawater and suggests areas of further improvements. The standard 234Th protocol method consists of scavenging 234Th from seawater via a MnO2 precipitate, beta counting, and using chemical recoveries determined by adding 230Th. The revised protocol decreases sample volumes to 2 L, shortens wait times between steps, and simplifies the chemical recovery process, expanding the ability to more rapidly and safely apply the 234Th method.The authors would like to acknowledge support from the National Aeronautics and Space Administration (NASA) as part of the EXport Processes in the Ocean from RemoTe Sensing (EXPORTS) program awards 80NSSC17K0555; and the Woods Hole Oceanographic Institution’s Ocean Twilight Zone study for KOB and SJC

The Suaineadh Project : a stepping stone towards the deployment of large flexible structures in space

The Suaineadh project aims at testing the controlled deployment and stabilization of space web. The deployment system is based on a simple yet ingenious control of the centrifugal force that will pull each of the four daughters sections apart. The four daughters are attached onto the four corners of a square web, and will be released from their initial stowed configuration attached to a central hub. Enclosed in the central hub is a specifically designed spinning reaction wheel that controls the rotational speed with a closed loop control fed by measurements from an onboard inertial measurement sensor. Five other such sensors located within the web and central hub provide information on the surface curvature of the web, and progression of the deployment. Suaineadh is currently at an advanced stage of development: all the components are manufactured with the subsystems integrated and are presently awaiting full integration and testing. This paper will present the current status of the Suaineadh project and the results of the most recent set of tests. In particular, the paper will cover the overall mechanical design of the system, the electrical and sensor assemblies, the communication and power systems and the spinning wheel with its control system

Masonry components

Masonry is a non-homogeneous material, composed of units and mortar, which can be of different types, with distinct mechanical properties. The design of both masonry units and mortar is based on the role of the walls in the building. Load-bearing walls relate to structural elements that bear mainly vertical loads, but can serve also to resist to horizontal loads. When a structural masonry building is submitted to in-plane and out-of-plane loadings induced by an earthquake for example, the masonry walls are the structural elements that ensure the global stability of the building. This means that the walls should have adequate mechanical properties that enable them to resist to different combinations of compressive, shear and tensile stresses.The boundary conditions influence the resisting mechanisms of the structural walls under in-plane loading and in a buildings the connection at the intersection walls are of paramount importance for the out-of-plane resisting mechanism. However, it is well established that the masonry mechanical properties are also relevant for the global mechanical performance of the structural masonry walls. Masonry units for load-bearing walls are usually laid so that their perforations are vertically oriented, whereas for partition walls, brick units with horizontal perforation are mostly adopted

The planning of rural health research: rurality and rural population issues

Rurality and rural population issues require special consideration when planning both qualitative and quantitative health research in rural areas. The objective of this article was to explore the issues that require attention when planning the research. This is the first of two articles and focus on issues that require consideration when undertaking rural health research. The diversity of study populations, the feasibility of a research topic, the selection of a research team, and the cultural traditions of Indigenous communities, are all aspects of rural health research planning that require attention. Procedures such as identifying the characteristics of the population, the selection of measures of rurality appropriate for the research topic, the use of local liaison persons, decisions on the use of 'insider' or 'outsider' researchers, and the identification of skills resources available, increase the quality of the research outcomes. These issues are relevant to both qualitative and quantitative research. Procedures are available to address issues of particular concern in developing appropriate methods for rural health research. While we have concentrated on Australian issues and solutions, rural localities in other countries may face similar issues. Attention to rurality and rural situations when planning rural health research, results in studies that support the continued improvement of health in rural communities

The conducting and reporting of rural health research: rurality and rural population issues

Rurality and rural population issues require consideration when conducting and reporting on rural health research. A first article focused on the planning stage of the research. The objective of this article is to explore conducting and reporting issues that require attention when undertaking rural health research. The privacy of participants, the collection of data, the cultural traditions of Indigenous communities, the dissemination of results, and giving something back to the community, are all aspects of conducting and reporting rural health research that require attention. Procedures such as identifying the characteristics of the population, attention to safety issues when collecting data, the use of local liaison persons and acknowledging the ownership of intellectual property, increase the quality of the research outcomes. They are issues that are relevant to both qualitative and quantitative research methods. Procedures are available to address issues of particular concern in developing appropriate methods for rural health research. While we have concentrated on Australian issues, and possible solutions, rural localities in many other countries may face similar issues. In any rural setting, paying attention to issues that may affect the conducting and reporting of rural health research will hopefully result in studies that support the continued improvement of health in rural communities