1,354,325 research outputs found
Monitoring udder health status using somatic cell counts in Iranian Holstein-Friesian dairy cows
No full textThe present study was performed to provide update information about udder health as determined by SCC in Iranian Holstein-Friesian dairy cattle, and to compare results with herds under a mastitis control program. A total of 17,990 monthly test-day records from 1,663 Holstein dairy cattle in 10 commercial dairy herds (“regular herds”) and 2,389 test-day records from 386 Holstein dairy cattle from 2 herds that were assigned to the 10-point mastitis control program (“controlled mastitis herds”) were included in the analysis. Each test-day record comprised the date of recording, daily milk production (kg), fat and protein yields (%), days in milk at date of recording, parity and SCC. Median (Q1–Q3) SCC×103 for “regular” and “controlled mastitis herds” was 136 (52–391) and 64 (24–204) cells/mL, and the percentage of records containing SCC > 200,000 cells/mL (elevated SCC) was 40.3 and 25.5%, respectively (P 40 kg of daily milk yield had lower odds of an elevated SCCs (P < 0.001). Also, the odds of an elevated SCC were lower in milk records taken in the summer and autumn than those taken in the winter (P < 0.05). The results demonstrated that udder health has been improved in Iranian Holstein dairy cattle over recent decade. There is some evidence that national mastitis control programs could support dairy producers in reaching a standard level. Host and environmental characteristics should be considered for the interpretation of SCC results
Monitoring udder health status using somatic cell counts in Iranian Holstein-Friesian dairy cows
No full textThe present study was performed to provide update information about udder health as determined by SCC in Iranian Holstein-Friesian dairy cattle, and to compare results with herds under a mastitis control program
Monitoring udder health status using somatic cell counts in Iranian Holstein-Friesian dairy cows
No full textThe present study was performed to provide update information about udder health as determined by SCC in Iranian Holstein-Friesian dairy cattle, and to compare results with herds under a mastitis control program. A total of 17,990 monthly test-day records from 1,663 Holstein dairy cattle in 10 commercial dairy herds (“regular herds”) and 2,389 test-day records from 386 Holstein dairy cattle from 2 herds that were assigned to the 10-point mastitis control program (“controlled mastitis herds”) were included in the analysis. Each test-day record comprised the date of recording, daily milk production (kg), fat and protein yields (%), days in milk at date of recording, parity and SCC. Median (Q1–Q3) SCC×103 for “regular” and “controlled mastitis herds” was 136 (52–391) and 64 (24–204) cells/mL, and the percentage of records containing SCC > 200,000 cells/mL (elevated SCC) was 40.3 and 25.5%, respectively (P 40 kg of daily milk yield had lower odds of an elevated SCCs (P < 0.001). Also, the odds of an elevated SCC were lower in milk records taken in the summer and autumn than those taken in the winter (P < 0.05). The results demonstrated that udder health has been improved in Iranian Holstein dairy cattle over recent decade. There is some evidence that national mastitis control programs could support dairy producers in reaching a standard level. Host and environmental characteristics should be considered for the interpretation of SCC results
A preliminary analysis of late structural failures of the Navion stent graft in the treatment of descending thoracic aortic aneurysms
No full textObjective: Patients in the Valiant Evo U.S. and international clinical trials had positive short-term outcomes; however, late structural failures, including type IIIb endoleaks have been recently discovered. Type IIIb endoleaks are serious adverse events because the repressurization of the aneurysm sac increases the risk of rupture. The purpose of the present study was to detail the imaging patterns associated with the structural failures with the aim of increasing awareness of failing graft presentation, early recognition, and prompt treatment. Methods: The Valiant Evo clinical trial was a prospective, single-arm investigation of a thoracic stent graft system. With the recent late structural failures, sites were requested to submit all available imaging studies to date to allow the core laboratory to assess for structural failures such as type IIIb endoleaks, stent ring fractures, and stent ring enlargement. Of the 100 patients originally enrolled in the trial from 2016 to 2018, the core laboratory assessed the imaging studies performed at ≥1 year for 83 patients. Results: No structural failures of the graft were reported through 1 year of follow-up. At 1 to 4 years, graft structural failures were detected in 11 patients with descending thoracic aortic aneurysms. Of the 11 patients, 5 had a type IIIb endoleak. Four of the five had imaging findings showing stent fractures consistent with the location of the graft seam and one had a type IIIb endoleak attributed to calcium erosion with no stent fracture or ring enlargement. Of the four patients with stent fracture in line with the graft seam, three underwent a relining procedure that successfully excluded the type IIIb endoleak. One of these three patients died 4 days later of suspected thoracic aortic rupture because the distal thoracic endovascular aortic repair extension had been landed in a previously dissected and fragile section of the aorta. The remaining six patients had had stent ring enlargement. One of the six patients had had persistent aneurysm expansion from the time of implantation onward and had died of unknown causes. The remaining five patients have continued to be monitored. Conclusions: In the present preliminary analysis, the imaging patterns associated with type IIIb endoleaks, stent fractures, and stent ring enlargement appear to be related to the loss of seam integrity or detachment of the stent rings from the surface of the graft material. The imaging patterns we have detailed should be closely monitored using computed tomography angiography surveillance to allow structural failures to be promptly identified and treated
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Self-assembly of three cationic silver(I) coordination networks with flexible bis(pyrazolyl)-based linkers
No full textThree new cationic silver(I) coordination polymers, {[Ag(mu-bpmb)](SO3CF3)}n (1), {[Ag(mu-bdb)1.5] (SO3CF3)}n (2) and {[Ag(mu-bpb)2](NO3)}n (3), with flexible 1,4-bis[(pyrazolyl)methyl]benzene (bpmb), 1,4-bis[(3,5-dimethylpyrazolyl)methyl]benzene (bdb), and 1,4-bis(pyrazolyl)butane (bpb) have been prepared at room temperature by the solvent layering method. The three compounds were characterized by FT-IR spectroscopy, PXRD, elemental analyses and single-crystal X-ray diffraction. Compound 1 is a highly undulated polymeric 1D chain in which the silver ions adopt a linear geometry, coordinating two bpmb linkers. Compounds 2 and 3 are both 2D coordination polymers with their silver atoms being three and four coordinated, and resulting in 6^3-hcb and 4^4-sql underlying net topologies, respectively. The flexible bispyrazolyl ligands display various conformations in the solid state, causing the formation of different Ag. . .Ag separations in the polymeric structures
Pilot-aided channel estimation for RIS-assisted wireless systems over time-varying fading channels
No full textReconfigurable intelligent surfaces (RISs) have emerged as a promising technology for improving wireless communication system performance. RISs can adjust signals' phase and amplitude, resulting in improved signal strength. In this paper, we investigate the performance of pilot-aided channel estimation for a RIS-assisted wireless communication system over time-varying fading channels. We present numerical results on the effect of the number of pilots and the percentage of pilots per frame on the bit error rate performance
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Anion-directed assembly of three cationic silver(I) coordination polymers with bis(imidazolyl)-based linker: Structural characterization and anion exchange study
No full textThree cationic silver(I) coordination polymers, namely [Ag2(μ-bib)3](SO3CF3)2·(CH3CN)n (1), [Ag(μ-bib)](NO3)·(H2O)n (2), and [Ag(μ-bib)]BF4n (3), have been prepared using flexible bis(imidazolyl)butane (bib) ligand and silver salts of different anions. All compounds are characterized by FT-IR, PXRD, elemental analysis, and single-crystal X-ray diffraction. Compound 1, containing triflate (SO3CF3−) anions, exhibits a two dimensional 63-hcb network with an amazing ABCDEF packing mode of the single hexagonal layers. Compound 2, containing nitrate ions, forms a simple one dimensional wavy chain, while compound 3 with BF4− anions, shows a double helix DNA-shaped structure stabilized by Ag⋯Ag interactions between the two strands. The anions in the structures 1–3 are non-coordinating and participate in weak H-bonding, while imidazolyl rings are involved in π⋯π stacking interactions. Anion exchange experiments in aqueous solution, monitored by FT-IR and PXRD analyses, reveal interesting structural transformations
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