An Alternative,Direct Approach for Arthroscopic Removal of Osteochondral Fragments in the Dorsal Pouch of the Proximal Intertarsal Joint of Horses          下载免费PDF全文

Ellen Compagnie  Niklas J. Drumm  Natascha de Heer  Frerik ter Braake 《Veterinary surgery : VS》2016,45(2):182-186

  相似文献   

Stellungnahme zum Wirkungsgesetz von E. A. Mitscherlich     

H. Niklas und M. Miller 《Forstwissenschaftliches Centralblatt》1926,48(6):390-392

Ohne Zusammenfassung  相似文献   

Global allocation rules for patterns of biomass partitioning in seed plants   总被引：3，自引：0，他引：3  

Enquist BJ  Niklas KJ 《Science (New York, N.Y.)》2002,295(5559):1517-1520

A general allometric model has been derived to predict intraspecific and interspecific scaling relationships among seed plant leaf, stem, and root biomass. Analysis of a large compendium of standing organ biomass sampled across a broad sampling of taxa inhabiting diverse ecological habitats supports the relations predicted by the model and defines the boundary conditions for above- and below-ground biomass partitioning. These canonical biomass relations are insensitive to phyletic affiliation (conifers versus angiosperms) and variation in averaged local environmental conditions. The model thus identifies and defines the limits that have guided the diversification of seed plant biomass allocation strategies.  相似文献   

Geochemistry and thermolysis of flavonoids     

Niklas KJ  Giannasi DE 《Science (New York, N.Y.)》1977,197(4305):767-769

The thermal and pH stability of selected flavonoids has been determined under simulated geologic conditions. Thermolytic rates and products for various regimes, as determined by gas chromatography-mass spectroscopy, indicate the potential usefulness of flavonoids as thermometric indicators in sediments. The parametric factors affecting flavonoid stability are used to geochemically characterize angiosperm "green leaves" (36 to 25 x 10(6) years old) from Succor Creek and indicate that these sediments have not experienced temperatures higher than 80 degrees C or extreme pH shifts (beyond the range 6.3 to 7.2) during postdepositional maturation.  相似文献   

Simulated wind pollination and airflow around ovules of some early seed plants     

Niklas KJ 《Science (New York, N.Y.)》1981,211(4479):275-277

Scale models of various early seed plant ovules and cupules were analyzed both for their characteristic air disturbance patterns and for the frequency of impact with airborne models of pollen (pseudopollen). The fossils on which the models were based had been arranged in an evolutionary sequence purporting to show the origin of the integument by the acropetal fusion and reduction in length of a subtending truss of lobes. Wind tunnel analyses of scale models showing the various stages in the consolidation of these preintegumentary lobes indicated that turbulent flow increases and becomes localized around the nucellar apex (salpinx) with the syngenesis and length reduction of those lobes. Similarly, the frequency of windborne pseudopollen impact increased. Thus, the transition from the megasporangium to the fully integumented ovule appears to favor increased wind-mediated pollination.  相似文献   

Zur Frage der Bestimmung der Formen der Bodens?ure in Waldb?den     

H. Niklas und A. Hod 《Forstwissenschaftliches Centralblatt》1925,47(4):287-298

Ohne Zusammenfassung  相似文献   

The multielectron ionization dynamics underlying attosecond strong-field spectroscopies     

Boguslavskiy AE  Mikosch J  Gijsbertsen A  Spanner M  Patchkovskii S  Gador N  Vrakking MJ  Stolow A 《Science (New York, N.Y.)》2012,335(6074):1336-1340

Subcycle strong-field ionization (SFI) underlies many emerging spectroscopic probes of atomic or molecular attosecond electronic dynamics. Extending methods such as attosecond high harmonic generation spectroscopy to complex polyatomic molecules requires an understanding of multielectronic excitations, already hinted at by theoretical modeling of experiments on atoms, diatomics, and triatomics. Here, we present a direct method which, independent of theory, experimentally probes the participation of multiple electronic continua in the SFI dynamics of polyatomic molecules. We use saturated (n-butane) and unsaturated (1,3-butadiene) linear hydrocarbons to show how subcycle SFI of polyatomics can be directly resolved into its distinct electronic-continuum channels by above-threshold ionization photoelectron spectroscopy. Our approach makes use of photoelectron-photofragment coincidences, suiting broad classes of polyatomic molecules.  相似文献   

Screening for in planta protein-protein interactions combining bimolecular fluorescence complementation with flow cytometry     

KW Berendzen  M Böhmer  N Wallmeroth  S Peter  M Vesi  Y Zhou  FK Tiesler  F Schleifenbaum  K Harter 《Plant methods》2012,8(1):25-17

ABSTRACT: Understanding protein and gene function requires identifying interaction partners usingbiochemical, molecular or genetic tools. In plants, searching for novel protein-proteininteractions is limited to protein purification assays, heterologous in vivo systems such as the yeast-two-hybrid or mutant screens. Ideally one would be able to search for novel proteinpartners in living plant cells. We demonstrate that it is possible to screen for novel proteinproteininteractions from a random library in protoplasted Arabidopsis plant cells and recoversome of the interacting partners. Our screen is based on capturing the bi-molecularcomplementation of mYFP between an YN-bait fusion partner and a completely random preyYC-cDNA library with FACS. The candidate interactions were confirmed using in plantaBiFC assays and in planta FRET-FLIM assays. From this work, we show that the wellcharacterized protein Calcium Dependent Protein Kinase 3 (CPK3) interacts with APX3,HMGB5, ORP2A and a ricin B-related lectin domain containing protein At2g39050. This isone of the first random in planta screens to be successfully employed.  相似文献   

Intervertebral disc degeneration in the dog. Part 1: Anatomy and physiology of the intervertebral disc and characteristics of intervertebral disc degeneration     

Niklas Bergknut  Lucas A. Smolders  Guy C.M. Grinwis  Ragnvi Hagman  Anne-Sofie Lagerstedt  Herman A.W. Hazewinkel  Marianna A. Tryfonidou  Björn P. Meij 《Veterinary journal (London, England : 1997)》2013,195(3):282-291

Intervertebral disc (IVD) degeneration is common in dogs and can give rise to a number of diseases, such as IVD herniation, cervical spondylomyelopathy, and degenerative lumbosacral stenosis. Although there have been many reports and reviews on the clinical aspects of canine IVD disease, few reports have discussed and reviewed the process of IVD degeneration. In this first part of a two-part review, the anatomy, physiology, histopathology, and biochemical and biomechanical characteristics of the healthy and degenerated IVD are described. In Part 2, the aspects of IVD degeneration in chondrodystrophic and non-chondrodystrophic dog breeds are discussed in depth.  相似文献   

Pre‐Columbian fisheries catch reconstruction for a subtropical estuary in South America     

Thiago Fossile  Jessica Ferreira  Dione da Rocha Bandeira  Levy Figuti  Srgio Dias‐da‐Silva  Niklas Hausmann  Harry K. Robson  David Orton  Andr Carlo Colonese 《Fish and Fisheries》2019,20(6):1124-1137

Small‐scale fisheries provide food and livelihoods for thousands of people along the Brazilian coastline. However, considerable uncertainties still surround the extent to which artisanal and subsistence fisheries contribute to the total of national landings and their historical ecological significance. Fisheries monitoring is deficient in Brazil, and historical records are limited to irregular accounts spanning the last few decades, while this coastline has supported human populations for at least 6,000 years. Here, we estimate pre‐Columbian subsistence catches for a large subtropical estuary in southern Brazil. Our results suggest that prehistoric populations may have extracted volumes of fish biomass higher than or comparable with historical subsistence fisheries in the region, and that the latter is likely underestimated. If a long‐term perspective is required to evaluate the current economic value and status of fisheries in subtropical and tropical South America, this should go beyond the historical time interval and integrate the contribution of pre‐Columbian archaeology.  相似文献