Compressibility, Phase Transitions, and Oxygen Migration in Zirconium Tungstate, ZrW2O8   总被引：1，自引：0，他引：1  

JSO Evans  Z Hu  JD Jorgensen  DN Argyriou  S Short  AW Sleight 《Science (New York, N.Y.)》1997,275(5296):61-65

In situ neutron diffraction experiments show that at pressures above 2 kilobars, cubic zirconium tungstate (ZrW2O8) undergoes a quenchable phase transition to an orthorhombic phase, the structure of which has been solved from powder diffraction data. This phase transition can be reversed by heating at 393 kelvin and 1 atmosphere and involves the migration of oxygen atoms in the lattice. The high-pressure phase shows negative thermal expansion from 20 to 300 kelvin. The relative thermal expansion and compressibilities of the cubic and orthorhombic forms can be explained in terms of the "cross-bracing" between polyhedra that occurs as a result of the phase transition.  相似文献   

Delayed type III hypersensitivity reaction with acute kidney injury in two dogs following administration of concentrated human albumin during treatment for hypoalbuminemia secondary to septic peritonitis     

Elisa M. Mazzaferro  Anusha Balakrishnan  Susan G. Hackner  Marnin Forman  JD Foster  Janine Calabro  Rachel E. Cianciolo 《Journal of Veterinary Emergency and Critical Care》2020,30(5):574-580

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Amyloid beta protein precursor gene and hereditary cerebral hemorrhage with amyloidosis (Dutch)   总被引：22，自引：0，他引：22  

C Van Broeckhoven  J Haan  E Bakker  J A Hardy  W Van Hul  A Wehnert  M Vegter-Van der Vlis  R A Roos 《Science (New York, N.Y.)》1990,248(4959):1120-1122

Human hereditary cerebral hemorrhage with amyloidosis of the Dutch type (HCHWA-D), an autosomal dominant form of cerebral amyloid angiopathy (CAA), is characterized by extensive amyloid deposition in the small leptomeningeal arteries and cortical arterioles, which lead to an early death of those afflicted in their fifth or sixth decade. Immunohistochemical and biochemical studies have indicated that the amyloid subunit in HCHWA-D is antigenically related to and homologous in sequence with the amyloid beta protein isolated from brains of patients with Alzheimer's disease and Down syndrome. The amyloid beta protein is encoded by the amyloid beta protein precursor (APP) gene located on chromosome 21. Restriction fragment length polymorphisms detected by the APP gene were used to examine whether this gene is a candidate for the genetic defect in HCHWA-D. The data indicate that the APP gene is tightly linked to HCHWA-D and therefore, in contrast to familial Alzheimer's disease, cannot be excluded as the site of mutation in HCHWA-D.  相似文献   

Safety of Antibiotic Drugs in Food Animals: Comparison of Findings from Preapproval Studies and Postapproval Experience in the United States with Safety Information in Published Literature     

Tomislav Modric DVM  PhD  Sanja Modric DVM  PhD  Michael J. Murphy DVM  JD  PhD  Susan J. Bright DVM  Stacey Shults DVM 《Veterinary Clinics of North America: Food Animal Practice》2011,27(2):389-405

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A pulsar, the heliosphere, and pioneer 10: probable mimicking of a planet of PSR B1257+12 by solar rotation     

K Scherer  H Fichtner  JD Anderson  EL Lau 《Science (New York, N.Y.)》1997,278(5345):1919-1921

Doppler data generated with the Pioneer 10 spacecraft's radio carrier wave between 1987 and 1995 show a 25.3-day periodicity which is related to the solar rotation. The timing data of the pulsar PSR B1257+12 also show a periodicity of 25.34 days, which has been explained as a signature of the pulsar's barycentric motion in response to the existence of a small moon-like object. However, because PSR B1257+12 is located close to the ecliptic and because the timing variations are in the range of microseconds, it is likely that the pulsar signal is affected by the same mechanism acting on the Pioneer 10 Doppler data. Hence, the hypothesized inner planet around PSR B1257+12 is probably an artifact of the heliosphere.  相似文献   

Effect of Estradiol and Progesterone on Metabolic Biomarkers in Healthy Bitches     

A Tvarijonaviciute  JD Carrillo‐Sanchez  JJ Ceron 《Reproduction in domestic animals》2013,48(3):520-524

The aim of this study was to evaluate the possible association between hormonal changes that occur during oestrus and biomarkers related with glucose metabolism (glucose and insulin), lipid metabolism (lipidic profile and BChE) and adipokines (adiponectin and ghrelin) in healthy bitches. For this purpose, we measured these analytes in serum of bitches, at two times: before (T1) and after (T2) the LH peak that were established according to progesterone concentrations. Increased levels of total cholesterol (p < 0.01), high density lipoprotein cholesterol (HDL‐C) (p < 0.01), low density lipoprotein cholesterol (LDL‐C) (p < 0.01), adiponectin (p < 0.01) and ghrelin (p < 0.05) were observed at T2 in comparison with T1. No statistically significant changes were observed in serum glucose, insulin, homoeostasis model assessment for insulin sensitivity (HOMA), triglycerides and BChE. When all data of T1 and T2 were pooled, serum adiponectin showed positive correlation with progesterone (r = 0.353; p = 0.022) and HDL‐C (r = 0.307; p = 0.048), and negative with insulin (r = ?0.429; p = 0.005), HOMA (r = ?0.446; p = 0.003) and BChE (r = ?0.522; p < 0.001). Ghrelin showed negative correlation with estradiol (r = ?0.701; p = 0.004). BChE was negatively correlated with estradiol (r = ?0.441; p = 0.018) and glucose (r = ?0.343; p = 0.028), and positively with insulin (r = 0.460; p = 0.003) and HOMA (r = 0.505; p < 0.001). In conclusion, changes in metabolic biomarkers occur in bitches after LH peak, characterized by increased lipids (total cholesterol, HDL cholesterol and LDL cholesterol) without changes in BChE activity, and increased adiponectin and ghrelin concentrations, without significant changes in glucose and insulin.  相似文献   

Isolation of Mycobacterium bovis from brushtail possums with non-visible lesions     

GW de Lisle  GF Yates  JD Coleman 《New Zealand veterinary journal》2013,61(4):221-224

AIM: To determine the prevalence of Mycobacterium bovis infection in brushtail possums (Trichosurus vulpecula) that did not have macroscopic lesions of bovine tuberculosis, and to evaluate culture of pooled tissues from multiple possums as a method for determining the M. bovis-infection status of wildlife populations in New Zealand.

METHODS: Pools of selected tissues were collected from possums from four different populations known to be infected with M. bovis. Tissue pools from individual animals, and combined pools from multiple animals, were cultured for M. bovis.

RESULTS: In the four populations investigated, the prevalence of possums with macroscopic lesions confirmed by culture to be infected with M. bovis ranged from 1 to 19 (mean 31/283; 10.9)%. The prevalence of possums with non-visible lesions that were culture positive for M. bovis in the same populations ranged from 4 to 10 (mean 24/283; 8.5)%. The mean of the log10 cfu of M. bovis of the macroscopic lesions and of the culture-positive samples that did not have visible lesions was 3.85 (SE 0.26) and 1.46 (SE 0.26) log₁₀ cfu, respectively (p<0.01). Mycobacterium bovis was cultured from pools of 30–50 animals in the four populations studied.

CONCLUSIONS: The finding of M. bovis infection in possums with non-visible lesions identified a potential deficiency of declaring possum populations free of M. bovis on the basis of absence of macroscopic lesions. The culturing of pools of selected tissues from multiple animals without visible lesions can be used to reduce laboratory costs of possum surveys without a major reduction in the ability to detect M. bovis infection.  相似文献   

Virulence of Pectobacterium carotovorum subsp. brasiliense on potato compared with that of other Pectobacterium and Dickeya species under climatic conditions prevailing in the Netherlands          下载免费PDF全文

J. M. van der Wolf  E. G. de Haan  P. Kastelein  M. Krijger  B. H. de Haas  H. Velvis  O. Mendes  M. Kooman‐Gersmann  P. S. van der Zouwen 《Plant pathology》2017,66(4):571-583

In western Europe, Pectobacterium carotovorum subsp. brasiliense is emerging as a causal agent of blackleg disease. In field experiments in the Netherlands, the virulence of this pathogen was compared with strains of other Dickeya and Pectobacterium species. In 2013 and 2014, seed potato tubers were vacuum infiltrated with high densities of bacteria (10⁶ CFU mL^?1) and planted in clay soil. Inoculation with P. carotovorum subsp. brasiliense and P. atrosepticum resulted in high disease incidences (75–95%), inoculation with D. solani and P. wasabiae led to incidences between 5% and 25%, but no significant disease development was observed in treatments with P. carotovorum subsp. carotovorum, D. dianthicola or the water control. Co‐inoculations of seed potatoes with P. carotovorum subsp. brasiliense and D. solani gave a similar disease incidence to inoculation with only P. carotovorum subsp. brasiliense. However, co‐inoculation of P. carotovorum subsp. brasiliense with P. wasabiae resulted in a decrease in disease incidence compared to inoculation with only P. carotovorum subsp. brasiliense. In 2015, seed potatoes were inoculated with increasing densities of P. carotovorum subsp. brasiliense, D. solani or P. atrosepticum (10³–10⁶ CFU mL^?1). After vacuum infiltration, even a low inoculum density resulted in high disease incidence. However, immersion without vacuum caused disease only at high bacterial densities. Specific TaqMan assays were evaluated and developed for detection of P. carotovorum subsp. brasiliense, P. wasabiae and P. atrosepticum and confirmed the presence of these pathogens in progeny tubers of plants derived from vacuum‐infiltrated seed tubers.  相似文献   

Application of real‐time RT‐PCR for large‐scale testing of potato for Potato spindle tuber pospiviroid*     

J. W. Roenhorst  C. C. C. Jansen  L. F. F. Kox  E. G. De Haan  G. W. Van Den Bovenkamp  N. Boonham  T. Fisher  R. A. Mumford 《EPPO Bulletin》2005,35(1):133-140

The real‐time RT‐PCR protocol of Boonham and coworkers performed extremely well in a recent ring test, comparing different methods for detection of Potato spindle tuber pospiviroid (PSTVd) in several laboratories. Since, in addition, real‐time PCR technology has proved suitable for high‐throughput testing, this method was chosen as the starting point for the development of a protocol for the large‐scale testing of potato. The initial experiments focused on the specificity of the primers and probes with regard to different isolates of PSTVd and other (pospi‐) viroids. Further experiments were performed with leaf material from both primarily and secondarily infected plants. The parameters studied were sampling position, growing‐on temperature and bulking rate. In addition, different grinding, nucleic‐acid extraction and disinfection methods were compared. To monitor false negatives and positives, different controls were included and tested in duplex and triplex formats. The final protocol was tested using a hundred samples from the Dutch potato‐monitoring programme. The results of this pilot experiment were promising. Future plans include the development of a protocol for direct tuber testing and inter‐laboratory ring testing of the protocols.  相似文献   

Characteristics of a resistance-breaking isolate of potato virus Y causing potato tuber necrotic ringspot disease     

J. F. J. M. van den Heuvel  R. A. A. van der Vlugt  M. Verbeek  P. T. de Haan  H. Huttinga 《European journal of plant pathology / European Foundation for Plant Pathology》1994,100(5):347-356

An Austrian isolate of potato virus Y^NTN, the causal agent of potato tuber necrotic ringspot disease (PTNRD), was serologically compared with seven Dutch PVY^N isolates. Using polyclonal and monoclonal antibodies, it was found indistinguishable from PVY^N. Determination of the nucleotide sequence of the coat protein cistron and comparison of the deduced amino acid sequence with coat protein sequences of other potyviruses revealed a high level of homology with PVY^N coat protein sequences. This confirmed the close taxonomic relationship of PVY^NTN with the PVY^N subgroup of potato virus Y. PVY^NTN is able to overcome all resistance genes known so far in commercial potato cultivars. Remarkably, transgenic PVY-protected tobacco plants are also resistant to PVY^NTN infection upon mechanical and aphid-mediated inoculation. These experiments indicate that genetically engineered resistance offers great potential in protection of potato to new aggressive strains of PVY^N.  相似文献