Preservation of the Cell-Biomaterial Interface at the Ultrastructural Level

Studying the tissue-biomaterial interface at the ultrastructural level is not without problems. Dissolution of the biomaterial in one of the dehydration or embedding media causes holes and shatter during sectioning or dislodgement of the biomaterial. The fine tuning of the hardness of both biomaterial and embedding medium, as well as the introduction of butyl-2,3- epoxypropylether as an intermediate between the dehydration series and the Epon resin , improving the impregnation , will solve many of the problems mentioned. With this improved technique good results were obtained with materials ranging from teflon, poly(Lactic acid) and polyurethanes to tissue culture polystyrene. No holes, shatter or dislodgement of the biomaterial was observed

The Phoenix Deep Survey: The 1.4 GHz microJansky catalogue

The initial Phoenix Deep Survey (PDS) observations with the Australia Telescope Compact Array have been supplemented by additional 1.4 GHz observations over the past few years. Here we present details of the construction of a new mosaic image covering an area of 4.56 square degrees, an investigation of the reliability of the source measurements, and the 1.4 GHz source counts for the compiled radio catalogue. The mosaic achieves a 1-sigma rms noise of 12 microJy at its most sensitive, and a homogeneous radio-selected catalogue of over 2000 sources reaching flux densities as faint as 60 microJy has been compiled. The source parameter measurements are found to be consistent with the expected uncertainties from the image noise levels and the Gaussian source fitting procedure. A radio-selected sample avoids the complications of obscuration associated with optically-selected samples, and by utilising complementary PDS observations including multicolour optical, near-infrared and spectroscopic data, this radio catalogue will be used in a detailed investigation of the evolution in star-formation spanning the redshift range 0 < z < 1. The homogeneity of the catalogue ensures a consistent picture of galaxy evolution can be developed over the full cosmologically significant redshift range of interest. The 1.4 GHz mosaic image and the source catalogue are available on the web at http://www.atnf.csiro.au/~ahopkins/phoenix/ or from the authors by request.Comment: 16 pages, 11 figures, 4 tables. Accepted for publication by A

Op weg naar een duurzaam elzensingellandschap

Veel elzensingels zijn verdwenen of sterk in kwaliteit achteruit gegaan. De instandhouding van dit type landschap is tegenwoordig enkel mogelijk met behulp van vrijwilligers voor landschapsbeheer en subsidies van de overheid. Alterra heeft met een groep betrokkenen als Staatsbosbeheer, Landschapsbeheer Friesland, LNV Noord, Stichting Boslandbouw bekeken, hoe dit landschap duurzaam ontwikkeld kan worde

Accurate prediction of core-level spectra of radicals at density functional theory cost via square gradient minimization and recoupling of mixed configurations

State-specific orbital optimized approaches are more accurate at predicting core-level spectra than traditional linear-response protocols, but their utility had been restricted on account of the risk of `variational collapse' down to the ground state. We employ the recently developed square gradient minimization (SGM, J. Chem. Theory Comput. 16, 1699-1710, 2020) algorithm to reliably avoid variational collapse and study the effectiveness of orbital optimized density functional theory (DFT) at predicting second period element 1s core-level spectra of open-shell systems. Several density functionals (including SCAN, B3LYP and $\omega$B97X-D3) are found to predict excitation energies from the core to singly occupied levels to high accuracy ($\le 0.3$ eV RMS error), against available experimental data. Higher excited states are however more challenging by virtue of being intrinsically multiconfigurational. We thus present a CI inspired route to self-consistently recouple single determinant mixed configurations obtained from DFT, in order to obtain approximate doublet states. This recoupling scheme is used to predict the C K-edge spectra of the allyl radical, the O K-edge spectra of CO$^+$ and the N K-edge of NO$_2$ to high accuracy relative to experiment, indicating substantial promise in using this approach for computation of core-level spectra for doublet species (vs more traditional time dependent DFT, EOM-CCSD or using unrecoupled mixed configurations). We also present general guidelines for computing core-excited states from orbital optimized DFT.Comment: Added more dat

Groei en productie van gewone esdoorn in Nederland

In the Netherlands growth and yield research on sycamore was done from 1976 to 2001. This includes studies by the Dorschkamp/IBN research institute and by Wageningen University. To-gether with the permanent sample plots from the timber prognosis system HOSP, this comprises a dataset of 32 plots with 113 recordings. For the development of top height htop with age t Cieszewski’s polymorphic model with site index h50 and three additional parameters fitted best.The diameter development up to stand height of 7 m was described with a model of Jansen et al., a power function in htop and initial spacing (N0). From a stand height of 7 m upwards, the basal area in-crement (iG) was described by Jansen’s et al. model based on a power function with htop, t, year of re-cording (yor), and the stand density of Hart (S %). For S% > 16.3 the basal area increment decreases non-linearly with increasing %. The model contains a correction factor for yor, although this was not significant, as the year of recording (yor), turned out to be not significant. The effect of thinning on the diameter after thinning was modelled with the La Bastide-Faber model.The models were used to construct a yield table with five site classes and one thinning intensity

Groei en productie van Amerikaanse eik in Nederland

In the Netherlands growth and yield research on red oak was done from 1949 to 1988. This includes studies by Becking and by the Dorschkamp/IBN research institute. Together with the perma-nent sample plots from the timber prognosis system HOSP, all this comprises a dataset of 58 plots with 306 recordings. For the development of top height htop with age t, Jansen & Hildebrand’s poly-morphic model with site index h70 and three additional parameters fitted best.The diameter development up to stand height of 7 m was described with a linear function in htop and initial density (N0). From a stand height of 7 m and up, the basal area increment (iG) was described by Jansen’s et al. model based on a power function with htop, t, year of recording (yor), and the stand density index of Hart (S %). For S% > 19.1 the basal area increment drops strongly non-linear with in-creasing S%. The model contains a correction factor for yor, which was not significant. The effect of thinning on the diameter after thinning, was modelled with a modified La Bastide-Faber model. The model was used to construct yield tables for with five site classes and one thinning intensit

Groei en productie van zomereik in Nederland

In the Netherlands growth and yield research on common oak was done from 1947 to 2004. This includes studies by Becking and by the Dorschkamp/IBN research institute. Together with the permanent sample plots from the timber prognosis system HOSP, all this comprises a dataset of 87 plots with 434 recordings. For the development of top height htop with age t Cieszewski’s model with site index h70 and three additional parameters fitted best. The diameter development up to stand height of 7 m was described with the model by Jansen et al. based on htop and initial density (N0). From a stand height of 7 m and up, the basal area increment (iG) was also described by another model by Jansen et al. based on a power function with htop, age, year of recording (yor), and the stand density of Hart (S %). For S% > 21.8 the basal area increment drops strongly with increasing %. The model contains a correction factor for yor; for the period since 1981, this factor is 15 % above the level of the period 1934 until 1980. The effect of thinning on the diameter after thinning was modelled with a modified La Bastide-Faber model. With all models together, a stand projection model was constructed, which describes the measured stand development reasonably well. The model was used to construct yield tables for with five site classes and five thinning intensities

Groei en productie van ruwe berk in Nederland

In the Netherlands growth and yield research on silver birch was done from 1982 to 1994. This includes studies by the Dorschkamp/IBN research institute and by Wageningen University. To-gether with the permanent sample plots from the timber prognosis system HOSP, this comprises a dataset of 43 plots with 132 recordings. For the development of top height htop with age t Cieszewski’s polymorphic model with site index h50 and three additional parameters fitted best.The diameter at a height of 7 m (d7) was estimated with the plot data and with the data of the Fourth National Forest Inventory, and the average of both estimates was chosen. The diameter develop-ment up to stand height of 7 m was described with a model of Jansen et al., a power function in htop and the estimated value for d7. From a stand height of 7 m upwards, the basal area increment (iG) was also described by Jansen’s et al. model based on a power function with h50, t, year of recording (yor), and the stand density of Hart (S %). For S% > 19.5 the basal area increment decreases non-lin-ear with increasing S %. The model contains a correction factor for yor, although this was not signifi-cant, as the year of recording (yor), turned out to be not significant. The effect of thinning on the di-ameter after thinning was modelled with the La Bastide-Faber model.The models were used to construct a yield table with five site classes and one thinning intensity

Groei en productie van Oostenrijkse den in Nederland

In the Netherlands, growth and yield research on Austrian pine was done from 1925 to 1990. This include studies by the Dorschkamp/IBN research institute. Together with the permanent sample plots from the timber prognosis system HOSP, all this comprises a dataset of 117 plots with 486 recordings. For the development of top height htop over age (t), Jansen & Hildebrand’s model with asymptote and 3 additional parameters fitted best. As site index, top height at 50 year (h50) was chosen. The diameter development up to stand height of 7 m was best described with a power func-tion based on htop, the density after refinements (NR), and h50. From a stand height of 7 m and up, the basal area increment (iG) was best described by a power function based on htop, t, and the stand den-sity index of Hart (S%). For S % > 28.7 the basal area increment drops with increasing S %. The effect of thinning on diameter after thinning was modelled with a modified La Bastide-Faber model. With all models together, a stand projection model was constructed, which follows the measured stand development reasonably well. The model was used to construct yield tables with seven site classes and six thinning intensities

Groei en productie van fijnspar in Nederland

From 1951 to 1989 growth and yield research was done on Norway spruce in the Nether-lands. This includes studies by Becking and by the Dorschkamp/IBN research institute. Together with the permanent sample plots from the timber prognosis system HOSP, all this comprises a dataset of 116 plots with 388 recordings. For the development of top height htop with age t Cieszewski’s model with site index h50 and 3 additional parameters fitted best. The diameter development up to stand height of 7 m was best described with a Gompertz function based on htop and initial density N0. The basal area increment iG was best described by a power function based on htop, age and S%. For S% > 14.7 the basal area increment drops non-linear with S%. Year of recording and site index were not significant. The effect of thinning on the diameter after thinning was modelled with a modified La Bastide-Faber model. With all models together, a stand projection model was constructed, which de-scribes the measured stand development reasonably well. The model was used to construct yield tables with five site classes and five thinning intensities