48 research outputs found
Which canonical algebras are derived equivalent to incidence algebras of posets?
We give a full description of all the canonical algebras over an
algebraically closed field that are derived equivalent to incidence algebras of
finite posets. These are the canonical algebras whose number of weights is
either 2 or 3.Comment: 8 pages; slight revision; to appear in Comm. Algebr
PENGARUH PEMBERIAN AIR ALKALI TERHADAP KADAR KOLESTEROL TOTAL PADA TIKUS PUTIH JANTAN GALUR SPRAGUE DAWLEY
Hiperlipidemia adalah peningkatan kadar lemak dalam darah karena konsumsi lemak secara berlebihan, sehingga asupan dan perombakan lemak tidak seimbang. Air alkali adalah air dengan kandungan mineral yang sangat tinggi di dalamnya terdapat kandungan antioksidan, yang diduga mempunyai efek menurunkan lipid darah. penelitian ini bertujuan mengetahuin efek air alkali terhadap kadar kolesterol total pada tikus putih jantan galur Sprague Dawley yang di induksi propiltiourasil (PTU). Kadar kolesterol total diukur dalam serum darah tikus dengan menggunakan alat strip kolesterol. Penelitian ini adalah eskperimental karena berinteraksi langsung dengan subjek penelitian. Penelitian ini menggunakan uji perbandingan. Hewan uji yang digunakan adalah tikus putih jantan Sprague Dawley berjumlah 24 ekor tikus yang dibagi dalam 6 kelompok perlakuan yaitu kelompok perlakuan normal (K1) kelompok perlakuan kontrol negative (K-) diberi suspensi propiltiourasil (PTU) 0,01 %, kelompok perlakuan kontrol positif (K+) diberi suspense Simvastatin 0.18 mg/200 g BB, kelompok perlakuan air alkali pH 8, pH 9, dan pH 10, Data dianalisis dengan uji one way Anova untuk membandingkan antara kelompok kontrol normal, kontrol negatif, control positif dan air alkali. Data hasil pengujian kadar kolesterol darah dengan pH 8, pH 9, dan pH 10 memberikan penurunan kadar kolesterol darah. Pemberian air alkali pH 10 pada hari ke 7 memberikan hasil yang signifikan dan berbeda nyata dibandingkan kelompok kontrol normal dan tidak berbeda nyata dengan simvastatin 0,018 mg/200 g BB. Hasil penelitian menunjukan bahwa pemberian air alkali dengan pH 10 pada hari ke 7 memberikan penurunan kadar kolesterol darah yang efektif dan berbeda nyata (signifikan) dibandingkan pemberian air alkali pH 8 dan air alkali pH 9.
Kata Kunci : Air alkali, kadar kolesterol darah, kolesterol
A systematic review of the effectiveness of universal Health Visitor led Child Health Clinics
This paper presents the findings of a systematic review undertaken to assess how effectively health visitor led child health clinics (âbaby clinicsâ) contribute to the promotion of pre-school child health and the reduction of health inequalities.Despite the widespread presence of baby clinics across the UK, there is little published research about the service model, its purpose or effectiveness. The initial search produced 559 articles, after removing duplicates, 175 abstracts were assessed against the inclusion criteria and 24 qualitative studies were identified as relevant to the review. No studies were excluded based on quality issues, however the quality of studies was variable. Thematic analysis was used to organise and interpret the data. Although the review presents a synthesis of research over the last 30 years, there is a lack of evaluative research about the structure, process and outcomes of baby clinics, which makes it impossible to draw any conclusions about the effectiveness of the service offer. Findings suggest research on the value and purpose of baby clinics is now needed and whilst good evaluation studies with clear outcome measures are sought, it is clear that the theoretical processes through which positive outcomes are promoted need to be established first
Categorification of a linear algebra identity and factorization of Serre functors
We provide a categorical interpretation of a well-known identity from linear
algebra as an isomorphism of certain functors between triangulated categories
arising from finite dimensional algebras.
As a consequence, we deduce that the Serre functor of a finite dimensional
triangular algebra A has always a lift, up to shift, to a product of suitably
defined reflection functors in the category of perfect complexes over the
trivial extension algebra of A.Comment: 18 pages; Minor changes, references added, new Section 2.
Derived equivalence classification of the cluster-tilted algebras of Dynkin type E
We obtain a complete derived equivalence classification of the cluster-tilted
algebras of Dynkin type E. There are 67, 416, 1574 algebras in types E6, E7 and
E8 which turn out to fall into 6, 14, 15 derived equivalence classes,
respectively. This classification can be achieved computationally and we
outline an algorithm which has been implemented to carry out this task. We also
make the classification explicit by giving standard forms for each derived
equivalence class as well as complete lists of the algebras contained in each
class; as these lists are quite long they are provided as supplementary
material to this paper. From a structural point of view the remarkable outcome
of our classification is that two cluster-tilted algebras of Dynkin type E are
derived equivalent if and only if their Cartan matrices represent equivalent
bilinear forms over the integers which in turn happens if and only if the two
algebras are connected by a sequence of "good" mutations. This is reminiscent
of the derived equivalence classification of cluster-tilted algebras of Dynkin
type A, but quite different from the situation in Dynkin type D where a
far-reaching classification has been obtained using similar methods as in the
present paper but some very subtle questions are still open.Comment: 19 pages. v4: completely rewritten version, to appear in Algebr.
Represent. Theory. v3: Main theorem strengthened by including "good"
mutations (cf. also arXiv:1001.4765). Minor editorial changes. v2: Third
author added. Major revision. All questions left open in the earlier version
by the first two authors are now settled in v2 and the derived equivalence
classification is completed. arXiv admin note: some text overlap with
arXiv:1012.466
Health promoting potential of herbal teas and tinctures from Artemisia campestris subsp maritima: from traditional remedies to prospective products
This work explored the biotechnological potential of the medicinal halophyte Artemisia campestris subsp. maritima (dune wormwood) as a source of health promoting commodities. For that purpose, infusions, decoctions and tinctures were prepared from roots and aerial-organs and evaluated for in vitro antioxidant, anti-diabetic and tyrosinase-inhibitory potential, and also for polyphenolic and mineral contents and toxicity. The dune wormwood extracts had high polyphenolic content and several phenolics were identified by ultra-high performance liquid chromatography-photodiode array-mass-spectrometry (UHPLC-PDA-MS). The main compounds were quinic, chlorogenic and caffeic acids, coumarin sulfates and dicaffeoylquinic acids; several of the identified phytoconstituents are here firstly reported in this A. campestris subspecies. Results obtained with this plant's extracts point to nutritional applications as mineral supplementary source, safe for human consumption, as suggested by the moderate to low toxicity of the extracts towards mammalian cell lines. The dune wormwood extracts had in general high antioxidant activity and also the capacity to inhibit a-glucosidase and tyrosinase. In summary, dune wormwood extracts are a significant source of polyphenolic and mineral constituents, antioxidants and a-glucosidase and tyrosinase inhibitors, and thus, relevant for different commercial segments like the pharmaceutical, cosmetic and/or food industries.FCT - Foundation for Science and Technology [CCMAR/Multi/04326/2013]; Portuguese National Budget; FCT [IF/00049/2012, SFRH/BD/94407/2013]; Research Foundation - Flanders (FWO) [12M8315N]info:eu-repo/semantics/publishedVersio
Examining concurrent validity and item selection of the Session Wants and Needs Outcome Measure (SWAN-OM) in a children and young people web-based therapy service
Background: Single-session mental health interventions are frequently attended by children and young people (CYP) in both web-based and face-to-face therapy settings. The Session âWantsâ and âNeedsâ Outcome Measure (SWAN-OM) is an instrument developed in a web-based therapy service to overcome the challenges of collecting outcomes and experiences of single-session therapies (SSTs). It provides pre-defined goals for the session, selected by the young person prior to the intervention, on which progress toward achievement is scored at the end of the session. Objective: The objective of this study was to evaluate the instrument's psychometric properties, including concurrent validity against three other frequently used outcome and experience measures, at a web-based and text-based mental health service. Methods: The SWAN-OM was administered for a period of 6 months to 1,401 CYP (aged 10â32 years; 79.3% white; 77.59% female) accessing SST on a web-based service. Item correlations with comparator measures and hierarchical logistic regressions to predict item selection were calculated for concurrent validity and psychometric exploration. Results: The most frequently selected items were âFeel betterâ (N = 431; 11.61%) and âFind ways I can help myselfâ (N = 411; 11.07%); unpopular items were âFeel safe in my relationshipsâ (N = 53; 1.43%) and âLearn the steps to achieve something I wantâ (N = 58; 1.56%). The SWAN-OM was significantly correlated with the Experience of Service Questionnaire, particularly the item âFeel betterâ [rs(109) = 0.48, p < 0.001], the Youth Counseling Impact Scale, particularly the item âLearn the steps to achieve something I wantâ [rs(22) = 0.76, p < 0.001], and the Positive and Negative Affect Schedule, particularly the items âLearn how to feel betterâ [rs(22) = 0.72, p < 0.001] and âExplore how I feelâ [rs(70) = â0.44, p < 0.001]. Conclusion: The SWAN-OM demonstrates good concurrent validity with common measures of outcome and experience. Analysis suggests that lesser-endorsed items may be removed in future iterations of the measure to improve functionality. Future research is required to explore SWAN-OM's potential to measure meaningful change in a range of therapeutic settings
The Surgical Infection Society revised guidelines on the management of intra-abdominal infection
Background: Previous evidence-based guidelines on the management of intra-abdominal infection (IAI) were published by the Surgical Infection Society (SIS) in 1992, 2002, and 2010. At the time the most recent guideline was released, the plan was to update the guideline every five years to ensure the timeliness and appropriateness of the recommendations.
Methods: Based on the previous guidelines, the task force outlined a number of topics related to the treatment of patients with IAI and then developed key questions on these various topics. All questions were approached using general and specific literature searches, focusing on articles and other information published since 2008. These publications and additional materials published before 2008 were reviewed by the task force as a whole or by individual subgroups as to relevance to individual questions. Recommendations were developed by a process of iterative consensus, with all task force members voting to accept or reject each recommendation. Grading was based on the GRADE (Grades of Recommendation Assessment, Development, and Evaluation) system; the quality of the evidence was graded as high, moderate, or weak, and the strength of the recommendation was graded as strong or weak. Review of the document was performed by members of the SIS who were not on the task force. After responses were made to all critiques, the document was approved as an official guideline of the SIS by the Executive Council.
Results: This guideline summarizes the current recommendations developed by the task force on the treatment of patients who have IAI. Evidence-based recommendations have been made regarding risk assessment in individual patients; source control; the timing, selection, and duration of antimicrobial therapy; and suggested approaches to patients who fail initial therapy. Additional recommendations related to the treatment of pediatric patients with IAI have been included.
Summary: The current recommendations of the SIS regarding the treatment of patients with IAI are provided in this guideline
Air quality and error quantity: pollution and performance in a high-skilled, quality-focused occupation
We provide the first evidence that short-term exposure to air pollution affects the work performance of a group of highly-skilled, quality-focused employees. We repeatedly observe the decision-making of individual professional baseball umpires, quasi-randomly assigned to varying air quality across time and space. Unique characteristics of this setting combined with high-frequency data disentangle effects of multiple pollutants and identify previously under-explored acute effects. We find a 1 ppm increase in 3-hour CO causes an 11.5% increase in the propensity of umpires to make incorrect calls and a 10 mg/m3 increase in 12-hour PM2.5 causes a 2.6% increase. We control carefully for a variety of potential confounders and results are supported by robustness and falsification checks