Vertebral venous system abnormalities identified with magnetic resonance imaging in sighthounds          下载免费PDF全文

John C. Vernon  Alexane Durand  Julien Guevar  Roberto José‐López  Gawain Hammond  Catherine Stalin  Rodrigo Gutierrez‐Quintana 《Veterinary radiology & ultrasound》2017,58(4):399-410

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Arterial pulse wave propagation velocity in healthy dogs by pulse wave Doppler ultrasound     

Rodrigo B. Nogueira  Lucas A. Pereira  Alice F. Basso  Ingrid S. da Fonseca  Lorena A. Alves 《Veterinary research communications》2017,41(1):33-40

The aim of this study was to prospectively evaluate the carotid-femoral pulse wave velocity (PWV) values in healthy dogs using pulse wave Doppler ultrasound. A secondary aim was to determine the feasibility of this method and to report the intra- and interobserver reproducibilities of the PWV in conscious dogs. The data were studied in 30 healthy, adult, male (n?=?15) and female (n?=?15) dogs. The time interval marked between the R wave peak of the electrocardiogram and the intersection of the blood flow wave upstroke of the Doppler spectrum with the baseline of zero frequency was determined for the carotid (T₁) and for the femoral (T₂) arteries. The distance covered by the pulse wave (L) was determined. The PWV was then calculated using the following formula: L/T₂ - T₁. The mean values of PWV calculated from the total sample (n?=?30) evaluated were 13.41?±?2.20 m/s. No significant statistical difference was observed for the PWV measurements between males (14.82?±?3.18 m/s) and females (12.64?±?2.45 m/s). The analysis revealed no intra nor interobserver differences. A reasonable reproducibility of the PWV measurements was showed by intraclass correlation coefficients (ICC), and the coefficients of variation (CV). These data demonstrate that noninvasive vascular Doppler analysis is a feasible and reproducible method to determine the carotid-femoral PWV in dogs.  相似文献   

No evidence of transmission of grapevine leafroll-associated viruses by phylloxera (<Emphasis Type="Italic">Daktulosphaira vitifoliae</Emphasis>)     

C. M. Wistrom  G. K. Blaisdell  L. R. Wunderlich  M. Botton  Rodrigo P. P. Almeida  K. M. Daane 《European journal of plant pathology / European Foundation for Plant Pathology》2017,147(4):937-941

Grapevine leafroll disease is associated with several species of phloem-limited grapevine leafroll-associated viruses (GLRaV), some of which are transmitted by mealybugs and scale insects. The grape phylloxera, Daktulosphaira vitifoliae (Fitch) Biotype A (Hemiptera: Phylloxeridae), is a common vineyard pest that feeds on the phloem of vine roots. There is concern that these insects may transmit one or more GLRaV species, particularly GLRaV-2, a species in the genus Closterovirus. A field survey was performed in vineyards with a high incidence of grapevine leafroll disease and D. vitifoliae was assessed for acquisition of GLRaV. In greenhouse experiments, the ability of D. vitifoliae to transmit GLRaV from infected root sections or vines to co-planted virus-free recipient vines was tested. There were no GLRaV-positive D. vitifoliae in the field survey, nor did D. vitifoliae transmit GLRaV-1, ?2, ?3, or -4LV in greenhouse transmission experiments. Some insects tested positive for GLRaV after feeding on infected source vines in the greenhouse, however there was no evidence of virus transmission to healthy plants. These findings, in combination with the sedentary behaviour of the soil biotype of D. vitifoliae, make it unlikely that D. vitifoliae is a vector of any GLRaV.  相似文献   

Design of a candidate vibrational signal for mating disruption against the glassy‐winged sharpshooter,Homalodisca vitripennis          下载免费PDF全文

Valerio Mazzoni  Shira D Gordon  Rachele Nieri  Rodrigo Krugner 《Pest management science》2017,73(11):2328-2333

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Canopy sensor placement for variable-rate nitrogen application in sugarcane fields     

Lucas R. Amaral  Rodrigo G. Trevisan  José P. Molin 《Precision Agriculture》2018,19(1):147-160

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Interaction of biological nitrogen fixation with sowing nitrogen fertilization on common bean in the two seasons of cultivation in Brazil     

Rodrigo Luiz Neves Barros  Leandro Barbosa de Oliveira  Welliton Barros Magalhães  Leonardo Oliveira Médici 《Journal of plant nutrition》2018,41(6):774-781

Sowing nitrogen (N) fertilization can limit biological nitrogen fixation (BNF) reducing common bean yield. The aim of this study was to evaluate the effect of sowing N fertilization plus inoculation on the growth and yield of plants in the two seasons of cultivation in Brazil. In the dry season, N fertilization and inoculation promoted a greater shoot dry weight and higher pod number and yield than only inoculated. In contrast, in the rainy season, this treatment promoted no increase in shoot dry weight and yield compared with the inoculated alone. The number of nodules was greater for the inoculated alone treatment, but nodule weight was not affected by N fertilization in either season. Therefore, sowing N fertilization and inoculation can be an agronomic practice to achieve a higher common bean yield in the dry season, while in the rainy season, the inoculation without N fertilization can support a high yield at a lower cost.  相似文献   

Soil quality and fertility in sustainable agriculture,with a contribution to the biological classification of agricultural soils     

Adriano Sofo  Augusto Zanella  Jean-François Ponge 《Soil Use and Management》2022,38(2):1085-1112

Soils and crops are particularly vulnerable to climate change and environmental stresses. In many agrosystems, soil biodiversity and ecosystem services provided by soils are under threat from a range of natural and human drivers. Agricultural soils are often subject to agronomic practices that disrupt soil trophic networks and make soils less productive in the long term. In this scenario, sustainable soil use aimed at improving plant/root status, growth and development plays a crucial role for enhancing the biological capacity of agricultural soils. This commentary paper is divided into the following four main sections: (i) the contentious nature of soil organic matter; (ii) soil biological quality/fertility; (iii) soil classification; and, (iv) which agricultural practices can be defined as sustainable? The published literature was analyzed within a holistic framework, with agrosystems considered as living systems where soil, vegetation, fauna and microorganisms co-evolve and are reciprocally influenced. Ultimately, this article will suggest a better stewardship of agricultural soils as a natural capital.  相似文献   

Bilateral patellar agenesis in dog: A case report     

Maíra Harumi Higa Lage  Júlia Augusta Rocha Pozavski  Alysson Rodrigo Lamounier  Eliane Gonçalves de Melo 《Anatomia, histologia, embryologia》2023,52(2):197-203

A bilateral patellar agenesis is an extremely rare congenital condition in which the patient does not develop both patellas and can present secondary alterations as bone, muscle and postural changes. There are some hypotheses that it has a genetic background presenting dominant characteristic. It is not yet standardized a gold treatment for this affection, but according to rare reports, clinical and surgical treatments are possible. This is a case report based on imagining exams of a mix breed male puppy that was born with bilateral patellar agenesis, an affection not yet reported in canine species.  相似文献   

Temporal changes in the fish community structure of a small subtropical spring lake: Decadal and seasonal analysis     

Arely Ramírez-García  Omar Domínguez-Domínguez  Eugenia López-López  Rodrigo Moncayo-Estrada  José De La Cruz-Agüero 《Ecology of Freshwater Fish》2023,32(1):53-63

In spring lakes, which have homogeneous environmental characteristics, it is expected that there will be no significant changes in the composition and structure of communities over time, and fluctuations will generally be related to the ecological attributes of the species. We studied the fish community in a small subtropical spring lake, Lake Zacapu, for two different decades to analyse its structural characteristics. Sampling was performed every 3 months at four sites from January to October 1995 and from May 2019 to May 2020. We determined the temporal variation (seasonal and decadal) in the fish community structure with respect to composition, abundance, diversity and dominance. We evaluated the association between species and water quality. Our results showed spatial homogeneity in most physicochemical variables that remained in the same range across decades, although some nutrients (NO₃) recently increased. All species identified in the early samples were present in the recent surveys (eleven native and two nonnative species), indicating that the fish community composition had significant qualitative stability. However, the dominant littoral cyprinid in 1995 was replaced by the more limnetic atherinopsid in 2019–2020, and the diversity and abundance of sensitive fish decreased in recent samplings. Consequently, the current status of critically endangered species is supported for some restricted and microendemic fish. The changes in the community structure attributes, which show a tendency for reduction in native species, emphasise the need to implement efforts to conserve freshwater fish diversity in small spring lakes.  相似文献