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Search Results: 1 - 10 of 297576 matches for " Jac J. Varco "
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The Effects of Stabilized Urea and Split-Applied Nitrogen on Sunflower Yield and Oil Content  [PDF]
Christopher J. Graham, Jac J. Varco
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.88125
Abstract: Sunflower is an efficient nitrogen (N) accumulator due to its aggressive taproot and extensive root system. While N rate studies in sunflower have shown a yield response, the response is often highly variable and difficult to predict in many instances. Additionally, since most sunflower production is intended for the oil market, surplus nitrogen tends to decrease oil content. Therefore, it is critical to hone nitrogen rates to maximize both yield and oil production and to incorporate alternative approaches to fertilizer application, which includes timing and method of application. The objective of the present study was to assess the efficacy of a split-application of N at either the V4 or R1 growth stage to increase yield and/or oil content in sunflower. A second objective was to examine whether a urease inhibitor could be used to retain soil N longer and achieve a similar effect as a split-application. Studies were conducted at two locations over two growing seasons in South Dakota, USA. A target rate of 90 kg·ha-1 was applied as urea-ammonium nitrate (UAN) either as an at-planting application or split-applied. Overall, N additions did significantly increase yield over a control. On average, the urease inhibitor tended to increase grain yields over split-applying N at either growth stage, however, there was no statistical effect on either grain yield or oil content. Based on 15N analysis, approximately 27% of the N in the grain was derived from the UAN fertilizer, which indicates a relatively large reliance upon soil N for grain N content. The addition of a urease inhibitor significantly increased average fertilizer uptake by nearly 6% to 32.7%.
Multi-Informant Test Anxiety Assessment of Adolescents  [PDF]
Jody Vincent Harpell, Jac J.W. Andrews
Psychology (PSYCH) , 2012, DOI: 10.4236/psych.2012.37075
Abstract: A total of 263 junior and senior high school students (grades 7, 8, 9, 10, 11, 12; ages 12 to 19) with relatively more informants identifying as females (57.4%) than males (42.6%) and more junior high school students (68.3%) than high school students (31.7%), along with 267 parents and 167 teachers responded to a student, parent, and teacher version of the German Test Anxiety Inventory (TAI-G) (Hoddapp & Benson, 1997). All reliabilities for all TAI-G scales for all three samples were above .70. The resulting data were fitted to two, three, and four factor models of test anxiety based on theoretical and empirical evidence. The four factor model (worry, emotion, distraction, lack of confidence) of the reduced (17 item) version of the TAI-G (Hoddapp & Benson, 1997) yielded the best fitting model for students (comparative fit index = .97; residual mean square = .042), parents (comparative fit index = .95; residual mean square = .073), and teachers (comparative fit index = .96; residual mean square = .080), thus providing very strong support for the proposed model. Sex, age, grade, and informant differences are presented and discussed. In conclusion, this study supports further research and use of a multi-informant assessment system of test anxiety.
Biochemical Characterization of Diverse Stat5b-Binding Enhancers That Mediate Growth Hormone-Activated Insulin-Like Growth Factor-I Gene Transcription
Ben Varco-Merth, Kasim Mirza, Damir T. Alzhanov, Dennis J. Chia, Peter Rotwein
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0050278
Abstract: Many of the biological effects of growth hormone (GH) are mediated by insulin-like growth factor I (IGF-I), a 70-amino acid secreted peptide whose gene expression is rapidly induced by GH via the Stat5b transcription factor. We previously identified multiple evolutionarily conserved GH-activated chromosomal binding domains for Stat5b within the rat Igf1 locus, and proposed that they could regulate IGF-I gene activity. Here we investigate the biochemical and functional characteristics of these putative long-range transcriptional enhancers. Each element contained 2 or 3 individual Stat5b recognition sequences that could bind Stat5b in vitro, but with affinities that varied over a >100-fold range. Full transcriptional responsiveness to GH required that all Stat5b sites be intact within an individual enhancer. Replacement of a single lower-affinity Stat5b sequence with a higher-affinity one increased in vitro binding of Stat5b, and boosted transcriptional potency of the entire element to GH. As enhanced transcriptional activity involved changes in only one or two nucleotides within an enhancer DNA segment, there appears to be remarkable specificity and sensitivity in the ability of Stat5b to transform DNA binding activity into transcriptional function. Stat5b was able to stimulate the transcriptional activity of two enhancers in the absence of GH, indicating that individual Stat5b-regulated elements possess distinct functional features. We conclude that combinatorial interplay among multiple Stat5b-binding response elements with distinguishable biochemical properties is responsible for highly regulated control of IGF-I gene activity by GH.
Contratransferência em psicoterapia e psiquiatria hoje
Zaslavsky, Jacó;Santos, Manuel J. Pires dos;
Revista de Psiquiatria do Rio Grande do Sul , 2005, DOI: 10.1590/S0101-81082005000300008
Abstract: the goal of this article is to demonstrate that even though there are differences between different theoretical schools in the field of psychoanalysis, a narrow convergence area has emerged: the utility of countertransference as a technical element to understand the patient. countertransference is included in the techniques of psychoanalysis, either with its original denomination (countertransference per se), or with some correlate concept that comprises it, such as projective identification, analytic field, role-responsiveness, enactment, intersubjectivity and analytic third, character and possible histories, etc. it is a concept upon which other concepts are built but its meaning does not concern only to technique. the psychoanalytical theory has changed after such a concept, becoming a double theory, or an attachment theory, about phenomena that occur between patient and therapist, and not only with the patient. in this sense, there is a paradigm change, as the facts are not related to a single individual anymore but to an interaction between two individuals, which is understood only while a product built from both. the psychology of one became the psychology of the attachment between two. the article emphasizes how a technical element can be useful in psychiatry, psychotherapy and psychoanalysis. the use of medication, its acceptance or not, and compliance with treatment or not can be better understood if the psychiatrist uses his or her feelings and makes an effort to understand the attachment between patient and therapist, either he or she is psychotic, borderline or neurotic. the authors conclude that countertransference is not only about the therapist's feelings during meetings, it means the wide use of the analyst's/therapist's/clinician's subjectivity to fully understand patients, as not only visible shallow phenomena will be approached, but also hidden, obscure feelings and meanings that underlie the unconscious of each individual, which determinates and
Effects of aquatic exercise on depression and anxiety in ischemic stroke subjects  [PDF]
Felipe J. Aidar, Nuno D. Garrido, António J. Silva, Victor M. Reis, Daniel A. Marinho, Ricardo Jacó de Oliveira
Health (Health) , 2013, DOI: 10.4236/health.2013.52030

Background: Stroke ranks third and is the leading cause of permanent disability in western countries. Furthermore there are no treatments for the psychosocial effects of this pathology. Purpose: Analyse the effect of an aquatic exercise program in depression and trace and state anxiety in subjects who suffered an ischemic stroke. Methods: Two groups were analyzed: experimental group (EG) n = 15, 50.3 ± 9.1 years; control group (CG) n = 13, 52.5 ± 7.7 years. EG underwent a 12-week aquatic exercise program. Both groups were evaluated in pre and post- treatment using Beck Depression Inventory (BDI) and Trace State Anxiety Inventory (IDATE). Wilcoxon signed-rank and Mann-Whitney tests were used to compare moments and groups, respec- tively. Results: The BDI scores of aquatic activities were: pre-treatment, 17.4 ± 7.7 and 16.9 ± 8.6 for the EG and CG, respectively; post-treat- ment, 13.2 + 7.1 and 16.4 + 7.9 for the EG and CG, respectively. The IDATE scores for anxiety trace in strength training were: pre-treatment, 43.2 + 12.5 and 42.9 + 12.2 for the EG and CG, respec- tively; post-treatment, 39.7 + 7.1 and 42.6 + 12.1 for the EG and CG, respectively. The IDATE scores for anxiety state in strength training were: pre-treatment, 46.9 + 7.6 and 47.4 + 8.1 for the EG and CG, respectively; post-treatment, 44.4 + 7.9 and 47.5 + 8.0 for the EG and CG, respectively. Significant differences were found in pre and post-treatment values in the EG and between groups in the depression and trace and state anxiety levels in post-treatment (p < 0.05). Conclusions: Aquatic physical activity contributes to an improvement of the levels of depression and anxiety in people who suffered a stroke.

The politics of public health in the United States
Jac Drewes
International Journal of Integrated Care , 2006,
Een episode uit de Joodsche kolonisatie van Guyana (1660)
Jac. Zwarts
Nieuwe West-Indische Gids , 1928,
Ensaio gráfico
Jac Leirner
ARS (S?o Paulo) , 2009, DOI: 10.1590/s1678-53202009000100008
Effectiveness and cost-effectiveness of an exposure-based return-to-work programme for patients on sick leave due to common mental disorders: design of a cluster-randomized controlled trial
Erik Noordik, Frank J van Dijk, Karen Nieuwenhuijsen, Jac JL van der Klink
BMC Public Health , 2009, DOI: 10.1186/1471-2458-9-140
Abstract: This study was designed as a pragmatic cluster-randomized controlled trial with a one-year follow-up and randomization on the level of OPs. We aimed for 60 OPs in order to include 200 patients. Patients in the intervention group received the RTW-E programme. Patients in the control group received care as usual. Eligible patients had been on sick leave due to common mental disorders for at least two weeks and no longer than eight weeks. As primary outcome measures, we calculated the time until full return to work and the duration of sick leave. Secondary outcome measures were time until partial return to work, prevalence rate of sick leave at 3, 6, 9, and 12 months' follow-up, and scores of symptoms of distress, anxiety, depression, somatization, and fatigue; work capacity; perceived working conditions; self-efficacy for return to work; coping behaviour; avoidance behaviour; patient satisfaction; and work adaptations. As process measures, we used indices of compliance with the intervention in the intervention group and employee-supervisor communication in both groups. Economic costs were calculated from a societal perspective. The total costs consisted of the costs of consuming health care, costs of production loss due to sick leave and reduced productivity, and out-of-pocket costs of patients for travelling to their OP.The results will be published in 2009. The strengths and weaknesses of the study protocol are discussed.ISRCTN72643128Common mental disorders (CMDs) are described as mild to moderately severe mental disorders. However, there is no generally accepted definition. Some experts define CMDs as consisting of depressive, anxiety, and somatoform disorders based on DSM IV criteria [1]. Others define CMDs as having a depressive episode or one of four different anxiety disorders defined by ICD-10, including mixed anxiety and depressive disorder with sub-threshold symptoms [2], or define CMDs as ranging from stress symptoms, measured by for instance the General H
Atividade física como preditor da ausência de fragilidade em idosos
Tribess, Sheilla;Virtuoso Júnior, Jair Sindra;Oliveira, Ricardo Jacó de;
Revista da Associa??o Médica Brasileira , 2012, DOI: 10.1590/S0104-42302012000300015
Abstract: objective: to analyze physical activity in different domains (work, transportation, housework, and leisure) as a predictor of the absence of frailty. methods: an epidemiological cross-sectional study with a random sample of 622 individuals aged > 60 years was carried out in uberaba, mg, brazil. receiver operating characteristic (roc) curves were generated and compared with physical activity in different domains and the absence of frailty. cutoffs points of physical activity (minutes/week) were established to predict the absence of frailty. a confidence interval of 95% was established in order to find the largest areas under the roc curves for work, transportation, household, and leisure. the total physical activity and its domains were assessed by the international physical activity questionnaire. the index of frailty (unintentional weight loss, functional limitation to chair rise, handgrip strength, physical activity, and exhaustion) was based on the study by fried; the participants were dichotomously classified as not frail and frail. results: the prevalence of frailty was 19.7% (men) and 20% (women). physical activity of moderate or vigorous intensity accumulated in different domains for 145 minutes/week for women and 140 minutes/week for men or 85 minutes/week for women and 112.5 minutes/week for men for activities in the leisure domain showed the best cutoff to predict the absence of frailty. conclusion: the practice of physical activity, especially in leisure time or accumulated in different domains, contributes to the prevention of frailty in the elderly.
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