Influence of organic amendments on Fe,Cu, Mn,and Zn availability and clay minerals of different soils     

Celia Maqueda  Esmeralda Morillo  Rafael Lopez  Tomas Undabeytia  Francisco Cabrera 《Archives of Agronomy and Soil Science》2013,59(5):599-613

The effects of application of composted olive mill wastewater sludge (A) and depotassified sugarbeet vinasse (V) on total diethylenetriaminepentaacetic acid (DTPA) and sequential extracted micronutrients were investigated. The mineralogy of the fine fraction of soils was also studied. The soils used were a Typic Rhodoxeralf (soil R), a Typic Xeropsamment (soil S), and a Typic Xerorthent (soil C). Fertilization with A and V during 3 years, in general did not significantly affect the total concentration of Fe, Cu, Mn, and Zn versus the control. However, the elements extracted with DTPA generally increased with the organic amendments, more with A than with V. The BCR (European Community Bureau of Reference) sequential extraction indicated that the addition of organic matter generally increased Zn and Mn in the two more available fractions. A great amount of Fe was found in the second and third fractions from the unamended and amended soils. Nevertheless, the sum of the three fractions was enhanced for the organic amendment, except for calcareous soil. The distribution of these elements in the different fractions was significantly affected by the type of soil. The addition of both fertilizers caused modifications in particle size and consequence redistribution of the calcite content between the different fractions.  相似文献   

Iron deficiency in citrus limon: effects on photo‐chlorophyllase synthetic pigments and chlorophyllase activity     

J. A. Fernandez‐Lopez  L. Almela  J. M. Lopez‐Roca  C. Alcaraz 《Journal of plant nutrition》2013,36(11):1133-1144

The photosynthetic pigment composition of chlorotic leaves of Citrus limon L. cv. Verna, grown in the field under iron deficiency conditions was determined. A Fe‐polyflavonoid was used as fertilizer to control iron chloro‐ sis. The photosynthetic pigment content and the chlorophyllase activity were determined at 20 day intervals during the deficiency recovery period and compared to untreated similar material. The corresponding differences among treated and untreated control material were analyzed. Iron application increased the levels of all pigments, but the extent of the increase depended on the pigment affected. The chlorophylls/carotenoids and ß‐carotene/xantophylls ratios were increased as chlorosis diminished. A multivariance analysis was performed with the data obtained which revealed that chlorophyll a and ß‐carotene had the highest correlation coefficient. The chlorophyllase activity did not show significant changes, but it was lower in the treated leaves than in the untreated control leaves during all the sampling cycle.  相似文献   

Residential Assessment and Perception Toward Biosolids Compost Use in an Urban Setting     

George W. Borden  Dale A. Devitt  Robert L. Morris  M.L. Robinson  Jim Lopez 《Compost science & utilization》2013,21(1):48-54

  相似文献   

Uptake,Transport, and Concentration of Chloride and Sodium in Three Citrus Rootstock Seedlings     

Francisco García-Sánchez  Pablo Botia  Gregorio Fernández-Ballester  Antonio Cerdá  Vicente Martínez Lopez 《Journal of plant nutrition》2013,36(11):1933-1945

ABSTRACT

Aspects of ammonium (NH₄ ⁺) toxicity in cucumber (Cucumis sativus L.) were investigated following growth with different N sources [nitrate (NO₃ ^?), NH₄ ⁺, or NH₄NO₃] supplied in concentrations of 1, 5, 10, or 15 mM. Plant dry weights and root: shoot ratios were lower with NH₄ ⁺-fed plants than with NO₃ ^?-fed plants. Ammonium accumulated strongly in leaves, stem, and roots when the concentration in the growth medium exceeded 1 mM. The increase in tissue NH₄ ⁺ coincided with saturation of glutamine synthetase activity and accumulation of glutamine and arginine. Low tissue levels of calcium and magnesium in the NH₄ ⁺-fed plants constituted part of the NH₄ ⁺-toxicity syndrome. Additions of small amounts of NH₄ ⁺ to NO₃ ^? -grown cucumber plants markedly increased the growth.  相似文献   

Canine Intra‐Articular Multipotent Stromal Cells (MSC) From Adipose Tissue Have the Highest In Vitro Expansion Rates,Multipotentiality, and MSC Immunophenotypes     

Nan Zhang BS  Marilyn A. Dietrich MS  Mandi J. Lopez DVM  MS  PhD  Diplomate ACVS 《Veterinary surgery : VS》2013,42(2):137-146

  相似文献   

Studies on the role of routes of allergen exposure in high IgE-producing beagle dogs sensitized to house dust mites     

Marsella R  Nicklin C  Lopez J 《Veterinary dermatology》2006,17(5):306-312

The current study aimed to investigate the role played by oral, epicutaneous, and inhalation routes of exposure to house dust mites (HDM). The colony of high IgE-producing beagle dogs has been shown to develop pruritic dermatitis compatible with atopic dermatitis following environmental exposure (EE) to HDM. In crossover experiments, the response to EE was compared to two modified challenges, oral exposure (OE) and snood and muzzle exposure (SME). For OE, HDM were fed daily for 3 days. For SME, ingestion of allergen was prevented but there was inhalation and epicutaneous exposure to all body regions except to one ear. In all experiments, dogs were challenged for three consecutive days, and evaluated before, 6 h after exposure and daily thereafter, for 5 days. After a wash-out period, groups were crossed-over so that each dog was randomly challenged to all three protocols. Clinical scores were analysed using least squares analysis of variance. All dogs developed pruritic dermatitis regardless of the protocol. With OE, lesions developed in the same body regions as with EE although scores were lower. This difference became more evident after the first 3 days when OE scores decreased and EE scores continued to increase. The scores of covered and uncovered ears did not differ with SME. Scores for the remainder of the body were significantly lower than for EE. The development of lesions on covered ears supports the importance of inhalation or a systemic reaction to epicutaneous exposure in other areas. It is concluded that all routes are important and have additive effects, that route of exposure does not determine the distribution of lesions and that continuous epicutaneous exposure probably plays the most important role.  相似文献   

What is your diagnosis? Tricuspid valve endocarditis     

Estepa JC  Mayer-Valor R  Lopez I  Aguilera-Tejero E 《Journal of the American Veterinary Medical Association》2006,229(1):37-38

  相似文献   

Fractionation of calcium and magnesium in equine serum     

Lopez I  Estepa JC  Mendoza FJ  Mayer-Valor R  Aguilera-Tejero E 《American journal of veterinary research》2006,67(3):463-466

OBJECTIVE: To establish reference values for protein-bound, ionized, and weak-acid complexed fractions of calcium and magnesium in equine serum and determine stability of ionized calcium (iCa) and ionized magnesium (iMg) in serum samples kept under various storage conditions. ANIMALS: 28 clinically normal horses. PROCEDURE: Total calcium (tCa) and magnesium (tMg) in equine serum were fractionated by use of a micropartition system that allows separation of protein-bound calcium (pCa) and magnesium (pMg) and ultrafiltrable calcium (microCa) and magnesium (microMg) fractions. Serum concentrations of iCa and iMg were measured in the ultrafiltrate by use of selective electrodes. Serum concentration of complexed calcium (cCa) or magnesium (cMg) was calculated by subtracting iCa or iMg from microCa or microMg, respectively. RESULTS: Mean +/-SE serum tCa concentration was 3.26 +/- 0.06 mmol/L. Calcium fractions were as follows: pCa, 1.55 +/- 0.03 mmol/L (47.4 +/- 0.9%); iCa, 1.58 +/- 0.03 mmol/L (48.5 +/- 0.7%); and cCa, 0.13 +/- 0.02 mmol/L (4.1 +/- 0.9%). Serum tMg concentration was 0.99 +/- 0.04 mmol/L. Magnesium fractions were as follows: pMg, 0.33 +/- 0.04 mmol/L (33.3 +/- 4.2%); iMg, 0.57 +/- 0.02 mmol/L (57.6 +/- 1.7%); and cMg, 0.09 +/- 0.02 mmol/L (9.1 +/- 1.9%). Refrigeration (4 degrees C) did not affect iCa values, whereas iMg declined by 8% after 120 hours. Neither iCa nor iMg was affected by freezing (-20 degrees C). CONCLUSIONS AND CLINICAL RELEVANCE: In equine serum, iMg is less stable than iCa; thus, when serum samples are not going to be analyzed promptly, freezing may be preferable to refrigeration for storage.  相似文献   

Serum concentrations of calcium, phosphorus, magnesium and calciotropic hormones in donkeys     

Lopez I  Estepa JC  Mendoza FJ  Rodriguez M  Aguilera-Tejero E 《American journal of veterinary research》2006,67(8):1333-1336

OBJECTIVE: To provide reference values for serum biochemical variables that are used for evaluation of mineral metabolism in donkeys and compare values with those in horses. ANIMALS: 18 donkeys and 18 horses. PROCEDURES: Total calcium (tCa), total magnesium (tMg), and inorganic phosphorus (P) concentrations were measured in serum samples via spectrophotometry. Ionized calcium (iCa) and magnesium (iMg) concentrations were quantified with selective electrodes. By use of a micropartition system, tCa and tMg were fractionated to separate protein-bound (pCa, pMg) and ultrafiltrable fractions. Complexed calcium (cCa) and magnesium (cMg) concentrations were calculated by substracting ionized fractions from ultrafiltrable fractions. Parathyroid hormone (PTH) and calcitriol (CTR) concentrations were measured via radioimmunoassay. RESULTS: Serum tCa concentration in donkeys (3.37 +/- 0.21 mmol/L) was composed of pCa (1.59 +/- 0.21 mmol/L [47.0 +/- 4.2%]), iCa (1.69 +/- 0.04 mmol/L [50.4 +/- 3.0%]), and cCa (0.09 +/- 0.08 mmol/L [2.6 +/- 2.9%]). Serum tMg concentration (1.00 +/- 0.08 mmol/L) was fractioned in pMg (0.23 +/- 0.08 mmol/L [23.4 +/- 8.1%]), iMg (0.59 +/- 0.04 mmol/L [58.8 +/- 5.1%]), and cMg (0.18 +/- 0.08 mmol/L [17.8 +/- 7.2%]). Serum concentrations of P (1.14 +/- 0.30 mmol/L), PTH (20.4 +/- 21.2 pg/mL), and CTR (13.4 +/- 5.9 pg/mL) were determined. CONCLUSIONS AND CLINICAL RELEVANCE: Serum variables of mineral metabolism in donkeys were within reference ranges for horses. However, when compared with horses, donkeys had higher iCa, cMg, and CTR and lower pMg and PTH concentrations.  相似文献   

International disease monitoring, October to December 2011     

Roberts H  Lopez M 《The Veterinary record》2012,170(6):146-149

  相似文献