Calibration and prediction of amino acids in stevia leaf powder using near infrared reflectance spectroscopy

The use of stevia as animal feed additive has been researched over the years, but how to rapidly predict its amino acid contents has not been studied yet by using near-infrared reflectance spectroscopy. In the present study, 301 samples of stevia leaf powder were defined as the calibration set from which calibration models were optimized, and the performance of prediction was evaluated. Compared with other mathematical treatments, the models developed with the "1, 12, 12, 1" treatment, combined with modified partial least-squares regression and standard normal variance with de-trending, had a significant potential in predicting amino acid contents, such as threonine, serine, etc. Six spectral regions were found to possess large spectrum variation and show high contribution to calibration models. From the present study, the calibration models of amino acids in stevia were successfully developed and could be applied to quality control in feed processing, breeding selection and mutant screening.     

Die Bestandsänderung der Waldvogelwelt durch Krieg und Kriegsfolgen und der forstliche Vogelschutz

Ohne Zusammenfassung     

Fracture energy approach for the identification of changes in the wood caused by the drying processes

Specific fracture energy measurements were applied to identify changes caused by wood-drying processes of solid wood. Specimen design and geometry as well as parameters and specifications for a fracture energy test were determined experimentally. The specific test set-up was applied on plantation teakwood sample sets of standard as well as alternating convection kiln dryings and one oven drying. The results show that alternating changes of the drying temperature along with the equilibrium moisture content (EMC) in a kiln schedule have a small but significant decreasing effect on the specific fracture energy in the radial/longitudinal as well as the tangential/longitudinal testing direction. Furthermore, oven drying at constant high drying temperature along with low EMC did not result in a significant change of specific fracture energy compared with standard drying, but caused greater scattering values in both transverse crack propagation systems.     

Strengthening capacity for agribusiness in agroforestry and natural resources in tertiary agricultural education in Africa: African Network for Agriculture,Agroforestry and Natural Resources Education (ANAFE)

This paper highlights the main achievements of the programme on Strengthening Africa’s Strategic Agricultural Capacity for Impact on Development (SASACID) funded by the Swedish International Development Cooperation Agency (Sida). The programme is implemented by the African Network for Agriculture, Agroforestry and Natural Resources Education (ANAFE) through 16 Pilot Institutions (PIs). It focuses on supporting agribusiness development in tertiary agricultural education and research in Africa. Under the programme, ANAFE is working towards refocusing agricultural learning and development objectives, producing contextualized learning materials, managing risk and uncertainties in agriculture, developing and reviewing curricula, retooling lecturers in pedagogy and strategizing on how best to work more closely with the private sector. The paper build on the final SASACID (2012–2014) report jointly developed through the Results-Based Management logical framework with the 16 SASACID Pilot Institutions (PIs) that met in Nairobi November 11–13, 2014. Results show that even though the PIs are at different levels of achievement over 75 % have achieved 80 % of the expected outputs. Management of scholarships for BSc and MSc students working with the private sector on risk management-related issues is among the outputs achieved by all the Pilot Institutions. Formalizing engagement with private sector through signing of Memoranda of Understanding (MoU) was reported by 25 % of the PIs working in Agribusiness through which students were supported to undertake research or internship within selected private sector firms; about 15 % got employed while others initiated their own businesses. A major output from the programme is the development and sharing of Agribusiness and Risk Management curricula frameworks for all degree levels from Diploma, BSc, MSc and PhD. Four Pilot institutions have signed MoUs with ANAFE to test the Agribusiness curricula at various levels. They are Rongo University College, Taita Taveta University College and Strathmore University (all from Kenya) and (Kenya), Mulungushi University (Zambia). The objective of this paper is to highlight ANAFE’s key achievements in transforming tertiary agricultural education and research in Africa, with specific reference to the SASACID programme. The programme was implemented from 2011 to 2015. Sixteen (16) ANAFE member institutions from 14 countries, competitively selected, implemented the SASACID programme, which focused on Agribusiness and management of risks and uncertainties in agriculture.     

The potential of SilviScan’s X-ray diffractometry method for the rapid assessment of spiral grain in softwood, evaluated by goniometric measurements

The orientation of the tracheid cells with respect to the stem axis (grain angle, spiral grain) exerts a strong influence on numerous material properties. Therefore, several methods have been developed to assess this wood anatomical feature. The current study compares SilviScan spiral grain measurements, which uses X-ray diffractometry, with direct goniometer readings. The correlation between these two methods yielded an r² of 0.874 and a root mean square error of prediction (RMSEP) of 1.21 clearly demonstrating that X-ray diffractometry can provide accurate and rapid information on the grain orientation in Norway spruce (Picea abies (L.) Karst.) or similar structured softwoods.     

Zur Stellungnahme der Herren H. Niklas und M. Miller zum Wirkungsgesetze der Wachstumsfaktoren

Ohne Zusammenfassung Siehe Seite 390 und 392 des laufenden Jahrganges unserer Zeitscchrift. (Schriftl.)     

Maximum effective lumen and pit pore sizes of the earlywood and the latewood of never dried loblolly pine sapwood

Summary Measurements of the air pressure required to initially displace a saturating liquid and allow a slow continuous stream of air bubbles to pass through wood cross sections of different thickness, together with the equilibrium surface tension of the saturating liquid, make it possible to calculate the maximum effective opening radii. Previous measurements were made for wood as a whole over complete annual rings. Measurements reported here were made separately for earlywood and latewood. Extrapolating plots of the maximum effective opening radius-cross section thickness, for thicknesses below the maximum fiber length, to zero thickness gave maximum lumen radii of 16 m for the earlywood and 10.3 m for the latewood. The values are only slightly greater than the calculated average values. Extrapolating the plots in the opposite direction to zero opening radius gave approximate maximum lumen or fiber lengths for the earlywood of 6 mm and for the latewood of 5 mm. The maximum effective opening radii for cross sections thicker than the maximum fiber length give maximum effective communicating pore radii. These values continue to decrease, with increasing thickness of the cross sections due to the decreasing probability of the largest openings falling in any one series path through the structures. The maximum effective pit pore radius for passage through fifty pits in series was 0.8 m for the earlywood and 0.28 m for the latewood.Paper No. 3787 of the Journal Series of North Carolina State University Agricultural Experiment Station, Releigh, N. C.