Racing performance after surgical repair of medial condylar fracture of the third metacarpal/metatarsal bone in thoroughbred racehorses     

Sophie Boorman BVetMed  Dean W. Richardson DVM  DACVS  Patricia M. Hogan VMD  DACVS  Darko Stefanovski PhD  MS  David G. Levine DVM  DACVS  DACSMR 《Veterinary surgery : VS》2020,49(4):648-658

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THE EFFECTS OF NITROGEN SOURCE AND CONCENTRATION ON THE GROWTH AND MINERAL COMPOSITION OF PRIVET     

G. V. Subbarao  R. M. Wheeler  G. W. Stutte  L. H. Levine 《Journal of plant nutrition》2013,36(11):1745-1761

Abstract

Sodium (Na) movement between plants and humans is one of the more critical aspects of bioregenerative systems of life support, which NASA is studying for the establishment of long‐term bases on the Lunar or Martian surface. This study was conducted to determine the extent to which Na can replace potassium (K) in red beet (Beta vulgaris L. ssp vulgaris) without adversely affecting metabolic functions such as water relations, photosynthetic rates, and thus growth. Two cultivars, Ruby Queen and Klein Bol, were grown for 42 days at 1200 μmol mol^?1 CO₂ in a growth chamber using a re‐circulating nutrient film technique with 0%, 75%, 95%, and 98% Na substitution for K in a modified half‐strength Hoagland solution. Total biomass of Ruby Queen was greatest at 95% Na substitution and equal at 0% and 98% Na substitution. For Klein Bol, there was a 75% reduction in total biomass at 98% Na substitution. Nearly 95% of the total plant K was replaced with Na at 98% Na substitution in both cultivars. Potassium concentrations in leaves decreased from 120 g kg^?1 dwt in 0% Na substitution to 3.5 g kg^?1 dwt at 98% Na substitution. Leaf chlorophyll concentration, photosynthetic rate, and osmotic potential were not affected in either cultivar by Na substitution for K. Leaf glycinebetaine levels were doubled at 75% Na substitution in Klein Bol, but decreased at higher levels of Na substitution. For Ruby Queen, glycinebetaine levels in leaf increased with the first increase of Na levels and were maintained at the higher Na levels. These results indicate that in some cultivars of red beet, 95% of the normal tissue K can be replaced by Na without a reduction in growth.  相似文献   

Low potassium enhances sodium uptake in red‐beet under moderate saline conditions     

G. V. Subbarao  R. M. Wheeler  G. W. Stutte  L. H. Levine 《Journal of plant nutrition》2013,36(10):1449-1470

Abstract

Due to the discrepancy in metabolic sodium (Na) requirements between plants and animals, cycling of Na between humans and plants is limited and critical to the proper functioning of bio‐regenerative life support systems, being considered for long‐term human habitats in space (e.g., Martian bases). This study was conducted to determine the effects of limited potassium (K) on growth, Na uptake, photosynthesis, ionic partitioning, and water relations of red‐beet (Beta vulgaris L. ssp. vulgaris) under moderate Na‐saline conditions. Two cultivars, Klein Bol, and Ruby Queen were grown for 42 days in a growth chamber using a re‐circulating nutrient film technique where the supplied K levels were 5.0, 1.25, 0.25, and 0.10 mM in a modified half‐strength Hoagland solution salinized with 50 mM NaCl. Reducing K levels from 5.0 to 0.10 mM quadrupled the Na uptake, and lamina Na levels reached ‐20 g kg^?1 dwt. Lamina K levels decreased from ‐60 g kg^?1 dwt at 5.0 mM K to ‐4.0 g kg^?1 dwt at 0.10 mM K. Ruby Queen and Klein Bol responded differently to these changes in Na and K status. Klein Bol showed a linear decline in dry matter production with a decrease in available K, whereas for cv. Ruby Queen, growth was stimulated at 1.25 mM K and relatively insensitive to a further decreases of K down to 0.10 mM. Leaf glycinebetaine levels showed no significant response to the changing K treatments. Leaf relative water content and osmotic potential were significantly higher for both cultivars at low‐K treatments. Leaf chlorophyll levels were significantly decreased at low‐K treatments, but leaf photosynthetic rates showed no significant difference. No substantial changes were observed in the total cation concentration of plant tissues despite major shifts in the relative Na and K uptake at various K levels. Sodium accounted for 90% of the total cation uptake at the low K levels, and thus Na was likely replacing K in osmotic functions without negatively affecting the plant water status, or growth. Our results also suggest that cv. Ruby Queen can tolerate a much higher Na tissue concentration than cv. Klein Bol before there is any growth reduction.  相似文献   

An Elicitor from Botrytis cinerea Induces the Hypersensitive Response in Arabidopsis thaliana and Other Plants and Promotes the Gray Mold Disease     

Govrin EM  Rachmilevitch S  Tiwari BS  Solomon M  Levine A 《Phytopathology》2006,96(3):299-307

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Reproductive biology of pond reared Nile tilapia, Oreochromis niloticus L.     

G JF Galemoni de Graaf  E A Huisman 《Aquaculture Research》1999,30(1):25-33

The reproductive performance of female Nile tilapia, Oreochromis niloticus L., reared in ponds under tropical conditions was studied. The experiments used stock matured to the age of 2–4 months and a size of 30–50 g. Oocyte development proved a better indicator for the determination of the size at first maturation than the development of the gonado-somatic index. The Nile tilapia became ‘stunted' in the sense that early breeding took place, but the somatic growth of the stock still continued. This result indicates that the earlier breeding of Nile tilapia is not a real bottleneck for the expansion of this production sector. No relationship was found between the condition factor and the size at first maturation or the relative fecundity. This led to the conclusion that aggravation of the living conditions is not a major cause of earlier breeding of pond-reared O. niloticus.  相似文献   

Veterinary antimicrobial stewardship in North America     

JF Prescott 《Australian veterinary journal》2019,97(7):243-248

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Tick‐Borne Relapsing Fever in Dogs          下载免费PDF全文

J. Piccione  G.J. Levine  C.A. Duff  G.M. Kuhlman  K.D. Scott  M.D. Esteve‐Gassent 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2016,30(4):1222-1228

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Multi‐Center Retrospective Evaluation of Screw and Polymethylmethacrylate Constructs for Atlantoaxial Fixation in Dogs          下载免费PDF全文

Megan W. Stout Steele  Amy W. Hodshon  Andrew L. Hopkins  Gaemia M. Tracy  Noah D. Cohen  Sharon C. Kerwin  C. Elizabeth Boudreau  William B. Thomas  Joseph M. Mankin  Jonathan M. Levine 《Veterinary surgery : VS》2016,45(7):909-915

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Lectin histochemical pattern on the normal and cystic ovaries of sows     

Marcelo HAF Mendes  Maria HB Pinto  Eduardo J Gimeno  Claudio G Barbeito  Fabiano JF de Sant'Ana 《Reproduction in domestic animals》2019,54(10):1366-1374

The lectin histochemical pattern (LHP) was characterized and compared in normal and cystic ovaries of sows. Six biotinylated lectins (PNA, SBA, WGA, RCA‐1, DBA and UEA‐1) were used on tissue sections. In the normal ovaries, the reaction to UEA‐1 and SBA was mild to moderate in mesothelial and endothelial cells. RCA‐1 staining was mild to moderate in theca interna of growing follicles, corpora luteum and mesothelium. In addition, this lectin presented strong reaction in endothelial cells, granulosa cells of atretic follicles, zona pellucida of growing follicles and plasma. DBA showed strong intensity in mesothelial and endothelial cells. There was mild to moderate reactivity to WGA in granulosa cells, corpus luteum and theca interna of follicles in development, and moderate in zona pellucida, in granulosa cells of atretic follicles and mesothelium. PNA staining was mild to moderate in oocytes and in the adventitia and media of medullary arteries. Changes in the LHP of the cystic ovaries were noted; however, there were no differences in these findings between the follicular and luteinized cysts. UEA‐1 reactivity in the cystic ovaries was moderately reduced in the mesothelial and endothelial cells, whereas there was mild reduction in the DBA staining in the granulosa cells. Reaction to RCA‐1 and WGA in the cysts also was decreased in theca interna, zona pellucida and granulosa cells of atretic follicles. Furthermore, endothelium and theca interna in the cystic ovaries presented mild reduction of marcation to SBA, whereas there was decreased reactivity to PNA in the oocytes and adventitia and media layers of the medullary arteries. The results of the current study show that cysts modify the LHP in swine ovaries. These changes of glycoconjugates in many ovarian structures could modify diverse process and may be one of the reasons for decreased fertility in sows.  相似文献   

Issues related to the detection of boundaries   总被引：10，自引：0，他引：10  

Fortin  M.-J.  Olson  R.J.  Ferson  S.  Iverson  L.  Hunsaker  C.  Edwards  G.  Levine  D.  Butera  K.  Klemas  V. 《Landscape Ecology》2000,15(5):453-466

Ecotones are inherent features of landscapes, transitional zones, and play more than one functional role in ecosystem dynamics. The delineation of ecotones and environmental boundaries is therefore an important step in land-use management planning. The delineation of ecotones depends on the phenomenon of interest and the statistical methods used as well as the associated spatial and temporal resolution of the data available. In the context of delineating wetland and riparian ecosystems, various data types (field data, remotely sensed data) can be used to delineate ecotones. Methodological issues related to their detection need to be addressed, however, so that their management and monitoring can yield useful information about their dynamics and functional roles in ecosystems. The aim of this paper is to review boundary detection methods. Because the most appropriate methods to detect and characterize boundaries depend of the spatial resolution and the measurement type of the data, a wide range of approaches are presented: GIS, remote sensing and statistical ones.  相似文献