Nutrient balance in water harvesting soils Díaz, F.; Jiménez, C.C.; Tejedor, M.
Sociedade & natureza : revista do Departamento de Geografia da Universidade Federal de Uberlândia,
05/2005, Letnik:
1, Številka:
1
Journal Article
NUTRIENT BALANCE IN WATER HARVESTING SOILS Díaz, F; Jiménez, C.C.; Tejedor, M.
Sociedade & natureza : revista do Departamento de Geografia da Universidade Federal de Uberlândia,
05/2005, Letnik:
Especial, Številka:
1
Journal Article
Recenzirano
Odprti dostop
Dryland farming on Fuerteventura and Lanzarote (Canary Islands, Spain), which has an annual rainfall of less than 150 mm/year, has been based traditionally on water harvesting techniques (known ...locally as “gavias”). Periods of high productivity alternate with those of very low yield. The systems are sustainable in that they reduce erosive processes, contribute to soil and soil-water conservation and are largely responsible for maintaining the soil’s farming potential. In this paper we present the chemical fertility status and nutrient balance of soils in five “gavia” systems. The results are compared with those obtained in adjacent soils where this water harvesting technique is not used. The main crops are wheat, barley, maize, lentils and chick-peas. Since neither organic nor inorganic fertilisers are used, nutrients are derived mainly from sediments carried by runoff water. Nutrients are lost mainly through crop harvesting and harvest residues. The soils where water harvesting is used have lower salt and sodium in the exchange complex, are higher in carbon, nitrogen, copper and zinc and have similar phosphorous and potassium content. It is concluded that the systems improve the soil’s natural fertility and also that natural renovation of nutrients occurs thanks to the surface deposits of sediments, which mix with the arable layer. The system helps ensure adequate fertility levels, habitual in arid regions, thus allowing dryland farming to be carried out.
Thermomagnetic properties and the crystallization process of a series of (Fe0.79Co0.21)75+xSi15−1.4xB10+0.4 metallic glasses are studied for the compositions x = 0, 2, 4, 6, 8, 10. The samples are ...studied by magnetic gravimetry, differential thermal analysis (DTA), and X‐ray diffraction. The crystalline phases and their crystallization temperatures are established for all the compositions. The Curie temperature of the amorphous phase is obtained by adjusting the experimental points of the thermomagnetic curve to a theoretical equation. This procedure seems to be more convenient than the usual way of obtaining the Curie temperatures by graphical extrapolation of the thermomagnetic curves.
Die thermomagnetischen Eigenschaften und der Kristallizationsprozeß einer Reihe von (Fe0,79Co0,21)75+xSi15−1,4xB10+0,4x Metallgläsern werden für die Zusammensetzungen x = 0, 2, 4, 6, 8, 10 ermittelt. Die Proben werden mit Hilfe von magnetischer Gravimetrie, Differenzthermoanalyse (DTA) und Röntgenbeugung untersucht. Die Kristallphasen und die Kristallisationstemperaturen werden für alle Zusammensetzungen bestimmt. Die Curietemperatur der amorphen Phase wird durch Anpassung der experimentellen Punkte auf der thermomagnetischen Kurve an eine theoretische Gleichung ermittelt. Dieses Vorgehen scheint angebrachter zu sein als der normale Weg, die Curietemperatur durch graphische Extrapolation der thermomagnetischen Kurve zu bestimmen.
Summary
A total of 67 strains of coagulase positive staphylococci isolated from healthy dogs and dogs suffering from otitis externa were studied. Twenty‐two isolates were from healthy dogs (five from ...hound dogs and 17 from companion dogs) and 45 from dogs suffering otitis externa (14 from hound dogs and 31 from companion dogs). Presumptive identification was attempted using the following tests: production of acetoin, anaerobic utilization of mannitol, acid production from mannitol, presence of β‐galactosidase, and growth on P agar supplemented with different concentrations of acriflavine. Susceptibility of staphylococci to 16 antibiotics was determined. Most effective antibiotics were imipenem, amoxycillin/clavulanic acid, ciprofloxacin, tobramycin, gentamicin and marbofloxacin. Penicillin, ampicillin and polymyxin B showed the lowest activity. There were no significant differences in antimicrobial susceptibility among isolates from healthy dogs and dogs suffering from otitis externa.
Different methods used for the measurement of magnetization saturation and perpendicular anisotropy by torque measurement of magnetic thin films are briefly discussed. Alternative methods to obtain ...these parameters from the data supplied by only one torque curve (maximum value of the torque, torque value for 45 degrees , and slope of the torque curve at the origin) are proposed and experimentally tested. Also, a condition of validity of these methods is given.< >
Cytomegalovirus ileitis in an immunocompetent patient Tejedor Cerdeña, M A; Velasco Guardado, A; Fernández Prodomingo, A ...
Revista española de enfermedades digestivas,
03/2011, Letnik:
103, Številka:
3
Journal Article
Recenzirano
Odprti dostop
Cytomegalovirus (CMV) is a virus that belongs to the family of Herpesviridae. Infection can cause a serious disease in immunocompromised patients, but it can also affect immunocompetent patients, ...creating generally self limiting symptoms. However, in some cases it can be fatal. We present a case of CMV ileitis with serious clinical symptoms that led to an operation in an immunocompetent patient.
Metallic glass samples of (Co sub x Fe sub 1-x ) sub 73.5 Nb sub 3 Cu sub 1 Si sub 13.5 B sub 9 are studied by thermomagnetic analysis. The Curie temperature increases with the substitution of Fe by ...Co, and crystallization temperature decreases. A simple consideration of the alloy as the sum of two magnetic systems is applied with good results. The observed discrepancies are explained as due to a magnetic interaction between the Co and Fe atoms.
Metallic glass samples of (Co sub(x)Fe sub(1-x)) sub(73.5)Nb sub(3)Cu sub(1)Si sub(13.5)B sub(9) are studied by thermomagnetic analysis. The Curie temperature increases with the substitution of Fe by ...Co, and crystallization temperature decreases. A simple consideration of the alloy as the sum of two magnetic systems is applied with good results. The observed discrepancies are explained as due to a magnetic interaction between the Co and Fe atoms.
Mutation A30P in the alpha-synuclein gene is a cause of familial Parkinson disease. Transgenic mice expressing wild mouse and mutant human A30P alpha-synuclein, Tg5093 mice (Tg), show a progressive ...motor disorder characterized by tremor, rigidity, and dystonia, accompanied by accumulation of alpha-synuclein in the soma and neurites and by a conspicuous gliosis beginning in the hippocampal formation at the age of 7 to 8 months and spreading throughout the CNS. Impaired short-term changes in synaptic strength have also been documented in hippocampal slices from Tg mice. Alpha-synuclein aggregates of approximately 34 and 70 kDa, in addition to the band of 17 kDa, corresponding to the molecular weight of alpha-synuclein, were recovered in the PBS-soluble fraction of brain homogenates from Tg mice but not from brain samples from age-matched wildtype littermates. MPTP-treated Tg and wildtype mice produced alpha-synuclein aggregates in the PBS-, deoxycholate-, and SDS-soluble fractions. Aggregates of alpha-synuclein, although with different molecular weights, were also observed in rotenone-treated Tg and wildtype mice. Pull-down studies with members of the Rab protein family have shown that alpha-synuclein from Tg mice interacts with Rab3a, Rab5, and Rab8. This binding is not due to the amount of alpha-synuclein (levels of which are higher in Tg mice) and it is not dependent on the amount of Rab protein used in the assay. Rather, alpha-synuclein interactions with Rab proteins are due to mutant alpha-synuclein as demonstrated in Rab pull-down assays with recombinant of wildtype and mutant A30P human alpha-synuclein. Since Rab3a, Rab5, and Rab8 are important proteins involved in synaptic vesicle trafficking and exocytosis at the synapse, vesicle endocytosis, and trans-Golgi transport, respectively, it can be suggested that these functions are impaired in Tg mice. This rationale is consistent with previous data showing that short-term hippocampal synaptic plasticity is altered and that alpha-synuclein accumulates in the cytoplasm of neurons in Tg mice.
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![Abnormal [alpha]-Synuclein ...](http://api.summon.serialssolutions.com/2.0.0/image/issn/XR4PS5YY4K/0022-3069/small "Abnormal [alpha]-Synuclein Interactions with Rab Proteins in [alpha]-Synuclein A30P Transgenic Mice")
