Comparative analysis of cytokine transcript profiles within mediastinal lymph node compartments of pigs after infection with porcine reproductive and respiratory syndrome genotype 1 strains differing in pathogenicity     

Obdulio García-Nicolás  Rubén S Rosales  Francisco J Pallarés  David Risco  Juan J Quereda  Simon P Graham  Jean-Pierre Frossard  Sophie B Morgan  Falko Steinbach  Trevor W Drew  Tony S Strickland  Francisco J Salguero 《Veterinary research》2015,46(1)

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Introducing an overall mass-transfer coefficient for prediction of drying curves at low-temperature drying rates     

Rubén A. Ananias  Eric Mougel  André Zoulalian 《Wood Science and Technology》2009,43(1-2):43-56

The aim of this study is to justify that the drying rate of wood can be represented by a phenomenological model defining a driving force expressed as the difference between the average wood moisture content and the equilibrium wood moisture content. The results show that the mathematical relation proposed is valid when introducing an overall mass transfer coefficient, K, at low temperature wood-drying rates.  相似文献   

Influence of land-use/land-cover change on landscape connectivity for an endemic threatened amphibian (Argenteohyla siemersi pederseni,Anura: Hylidae)     

Schivo  Facundo  Mateo-Sánchez  María Cruz  Bauni  Valeria  Quintana  Rubén Darío 《Landscape Ecology》2020,35(6):1481-1494

Context

Modifications in natural landcover generally result in a loss of habitat availability for wildlife and it’s persistence will depend largely on their spatial configuration and functional connections. Argenteohyla siemersi is a threatened and endemic amphibian whose habitat is composed of forest patches near rivers and water bodies edges.

Objectives

This study aimed to analyse the accessible habitat for this species and identify key elements to maintain its ecological network in two different types of land uses: an anthropized area with extensive cattle raising and a protected area.

Methods

The structural and functional characteristics of both landscapes were analyzed. The connectivity at landscape level and the contribution of each habitat patch were evaluated through simulation models with different dispersion distances in the context of the graph theory.

Results

In both landscapes, nine types of landcover were identified with different compositions. Remarkable differences were found in habitat connectivity for this amphibian species between both landscapes. As the percentage of dispersion distance increases, reachable habitat increases as well, although with higher percentages in the protected area. Two corridors were identified in the protected landscape and one in the rangeland one; patches and key links constituted all of them.

Conclusions

The present work provides spatially explicit results with a quantitative basis. It could be useful as a tool for the development of management plans aimed at guaranteeing the functionality of the ecological network for this endangered species and, therefore, contribute to its long-term conservation.

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Impacts caused by the addition of wine vinasse on some chemical and mineralogical properties of a Luvisol and a Vertisol in La Mancha (Central Spain)     

Paz Conde Bueno  Juan Antonio Martín Rubí  Rosario García Giménez  Raimundo Jiménez Ballesta 《Journal of Soils and Sediments》2009,9(2):121-128

Background, aim, and scope  Using wastewaters from wine production that are often discharged directly into soil, with previous treatment, we carried out an experiment to identify the impact over time, specifically to identify the benefits and risks of its application. Materials and methods  Experiments were carried out using approximately 200 g of samples of agricultural soils which were amended with increased amounts of vinasse: 1–5–10–20–40–70 ml. The doses used were not arbitrary but similar to the usual one amended. Soil electric conductivity was determined in distilled water with a glass electrode (soil to H₂O ratio 1:5). Clay identification of soil samples are by X-ray diffraction. Results  The pH decreased slightly and salinity increased, possibly leading to changes in crop productivity. The increase in salinity reflects the concentration of dissolved salts in the vinasse. Significant changes were observed in the clay minerals after amendment with the vinasse. Conclusions  Our study indicates that, under experimental incubation, the application of increasing doses of wine vinasse for increasingly long periods can affect certain chemical properties. The results show that application of winery wastewaters to soil results in significant increases of electrical conductivity, reaching levels that can be detrimental to crop growth. The decrease in pH values is somehow beneficial, and finally there is a small increase in the chemical weathering of clay minerals  相似文献   

Influence of eCG and breed on the number of oocytes collected and the production of in vitro embryos of young goats during the reproductive season     

Montes-Quiroz  Gabriela Lisset  Sánchez-Dávila  Fernando  Domínguez-Díaz  David  Vázquez-Armijo  José Fernanco  Grizelj  Juraj  Ledezma-Torres  Rogelio A.  Cervantes-Vega  Rubén  Arce-Vázquez  Nestor  Garza-Brenner  Estela  Bernal-Barragán  Hugo 《Tropical animal health and production》2019,51(8):2521-2527

Tropical Animal Health and Production - The objective of this study was to determine the effect of breed and equine chorionic gonadotropin (eCG) on ovarian response and in vitro embryo production...  相似文献   

A semi-defined medium without serum for small ruminant mycoplasmas     

Ramírez AS  Fleitas JL  Rosales RS  Poveda C  de la Fe C  Andrada M  Castro A  Poveda JB 《Veterinary journal (London, England : 1997)》2008,178(1):149-152

The composition of the medium used to cultivate Mycoplasma species is very important. Serum is one of the most important additives as it contains lipids (cholesterol) and serum proteins, which are essential for the growth of the organisms. This work reports the development of a semi-defined medium, called MWS (Medium Without Serum) produced without animal serum and bovine serum albumin. MWS seems to be suitable for cultivating several species of caprine mycoplasma, especially M. mycoides subsp. mycoides (LC) and M. mycoides subsp. capri.  相似文献   

Inconsistent effects of agricultural practices on soil fungal communities across 12 European long-term experiments     

Silja Emilia Hannula  Dominico Paolo Di Lonardo  Bent T. Christensen  Felicity V. Crotty  Annemie Elsen  Peter J. van Erp  Elly M. Hansen  Gitte H. Rubæk  Mia Tits  Zoltan Toth  Aad J. Termorshuizen 《European Journal of Soil Science》2021,72(4):1902-1923

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Physiological Effects of Exposure to Arsenic,Mercury, Antimony and Selenium in the Aquatic Moss Fontinalis antipyretica Hedw.     

Díaz  Santiago  Villares  Rubén  Vázquez  María D.  Carballeira  Alejo 《Water, air, and soil pollution》2013,224(8):1-14

This study assessed the effect of ambient air pollution on leaf characteristics of white willow, northern red oak, and Scots pine. Willow, oak, and pine saplings were planted at sixteen locations in Belgium, where nitrogen dioxide (NO₂), ozone (O₃), sulfur dioxide (SO₂), and particulate matter (PM₁₀) concentrations were continuously measured. The trees were exposed to ambient air during 6 months (April–September 2010), and, thereafter, specific leaf area (SLA), stomatal resistance (R _s), leaf fluctuating asymmetry (FA), drop contact angle (CA), relative chlorophyll content, and chlorophyll fluorescence (F _v/F _m) were measured. Leaf characteristics of willow, oak, and pine were differently related to the ambient air pollution, indicating a species-dependent response. Willow and pine had a higher SLA at measuring stations with higher NO₂ and lower O₃ concentrations. Willow had a higher R _s and pine had a higher F _v/F _m at measuring stations with a higher NO₂ and lower O₃ concentrations, while oak had a higher F _v/F _m and a lower FA at measuring stations with a higher NO₂ and lower O₃ concentrations. FA and R _s of willow, oak, and pine, SLA of oak, and CA of willow were rather an indicator for local adaptation to the micro-environment than an indicator for the ambient air pollution.  相似文献   

Seasonal variation in nutrient concentration in leaves and inflorescences of Avocado     

A. M. Castillo‐Gonzalez  J.L. Tirado‐Torres  M. Rubí‐Arriaga  E. Avitia‐García 《Journal of plant nutrition》2013,36(5):663-671

The concentrations of nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg) were determined in leaves from the north and south sides of the tree canopy, and in apical and basal parts of winter and fall inflorescences of 20‐year‐old ‘Colin V‐33’ avocado (Persea americana Mill.) trees, to observe the seasonal variation of all these nutrients in leaves and in inflorescences. The concentration of all the elements evaluated did not change considerably during the months of flowering and vegetative growth, but it changed with leaf age. The concentration of Ca and Mg were 14 and 7% higher, in the leaves on the south side of the canopy than in those on the north side. Inflorescences had higher P and K, and lower Ca and Mg concentrations than leaves. The concentration of Ca and Mg was higher in the winter inflorescences than in the autumn ones. The concentration of P was significantly higher in the apical part of the inflorescence than in the basal part.  相似文献   

Effect of the type of silage on milk yield,intake and rumen metabolism of dairy cows grazing swards with low herbage mass          下载免费PDF全文

Miguel Ruiz‐Albarrán  Oscar A. Balocchi  Mirela Noro  Fernando Wittwer  Rubén G. Pulido 《Animal Science Journal》2016,87(7):878-884

The aim of this study was to evaluate the effect of herbage allowance (HA) and type of silage supplemented (TS) on milk yield, dry matter intake (DMI) and metabolism of dairy cows in early lactation. Thirty‐six Holstein‐Friesian dairy cows were allocated to four treatments derived from an arrangement of two HA (LHA = 17 or HHA = 25 kg of DM/cow/day) and two TS (grass (GS) or maize (MS)). Herbage allowance had no effect on DMI or milk yield. Rumen pH and NH₃‐N concentration were not affected by HA. The efficiency of microbial protein synthesis in the rumen (microbial protein (MP)) was affected by HA with 21.5 and 23.9 g microbial nitrogen per kg ruminal digestible organic matter for LHA and HHA, respectively (P < 0.05). Supplementation with MS showed higher values of milk yield by 2.4 kg/cow/day (P < 0.001), milk protein content by 0.10 % (P < 0.023) and herbage DMI by 2.2 kg/cow/day, and showed lower values for milk urea compared to GS (P < 0.001). The former results suggest that TS had a greater effect on milk yield, total feed intake and energy intake than increase in herbage allowance; however, increase in HA had greater effects on MP than TS.  相似文献