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Outcomes of an early childhood obesity prevention program in a low-income community: a pilot, randomized trial. Pediatr Obes 2018; 13:677-685. [PMID: 30156058 PMCID: PMC7982990 DOI: 10.1111/ijpo.12458] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 06/04/2018] [Accepted: 06/15/2018] [Indexed: 11/28/2022]
Abstract
BACKGROUND Obesity is a major and worldwide health problem in children. OBJECTIVES The Early Childhood Obesity Prevention Program is a multi-component, randomized, controlled trial of a pilot community-focused obesity prevention program for mother/newborn dyads. METHODS Underserved, mother/newborn dyads were recruited to receive a standard home visitation program (Nurturing Families Network, NFN) or an enhanced program (NFN+) that incorporated behavioural change strategies (e.g., goal-setting, problem-solving) and focused on six obesity-associated behaviours (breastfeeding, juice/sugar-sweetened beverages, solids, infant sleep, TV/screen time and soothability) with linkages to community resources. Weight-for-length (WFL) z-score and maternal diet were secondary outcomes. RESULTS Fifty-seven dyads were recruited and 47 fully eligible dyads were enrolled (NFN = 21, NFN+ = 26). Forty-one (87.2%) were assessed at 6 months and 34 (72.3%) at 12 months. Retention at 12 months was higher for NFN+ dyads (84.6% vs. 56.1%, p = 0.04). NFN+ mothers were more likely to continue breastfeeding at 6 and 12 months vs. NFN mothers (p = 0.03 and 0.003, respectively), and at 12 months, NFN+ infants had fewer nocturnal awakenings (p = 0.04). There were no differences in other primary outcome measures or in WFL z-score at 6 or 12 months. CONCLUSIONS A multi-component behavioural intervention increased breastfeeding duration and decreased nocturnal awakenings in infants of low-income families.
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Probiotics for vaginal health in South Africa: what is on retailers' shelves? BMC WOMENS HEALTH 2017; 17:7. [PMID: 28103868 PMCID: PMC5248517 DOI: 10.1186/s12905-017-0362-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 01/05/2017] [Indexed: 01/26/2023]
Abstract
BACKGROUND Probiotics are widely used to improve gastrointestinal (GI) health, but they may also be useful to prevent or treat gynaecological disorders, including bacterial vaginosis (BV) and candidiasis. BV prevalence is high in South Africa and is associated with increased HIV risk and pregnancy complications. We aimed to assess the availability of probiotics for vaginal health in retail stores (pharmacies, supermarkets and health stores) in two major cities in South Africa. METHODS A two-stage cluster sampling strategy was used in the Durban and Cape Town metropoles. Instructions for use, microbial composition, dose, storage and manufacturers' details were recorded. RESULTS A total of 104 unique probiotics were identified in Cape Town and Durban (66.4% manufactured locally). Cape Town had more products than Durban (94 versus 59 probiotics), although 47% were common between cities (49/104). Only four products were explicitly for vaginal health. The remainder were for GI health in adults (51.0%) or infants (17.3%). The predominant species seen overall included Lactobacillus acidophilus (53.5%), L. rhamnosus (37.6%), Bifidobacterium longum ssp. longum (35.6%) and B. animalis ssp. lactis (33.7%). Products for vaginal health contained only common GI probiotic species, with a combination of L. acidophilus/B. longum ssp. longum/B. bifidum, L. rhamnosus/L. reuteri or L. rhamnosus alone, despite L. crispatus, L. gasseri, and L. jensenii being the most common commensals found in the lower female reproductive tract. CONCLUSION This survey highlights the paucity of vaginal probiotics available in South Africa, where vaginal dysbiosis is common. Most vaginal products contained organisms other than female genital tract commensals.
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Treatment motivation among caregivers and adolescents with substance use disorders. J Subst Abuse Treat 2017; 75:10-16. [PMID: 28237049 DOI: 10.1016/j.jsat.2017.01.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2016] [Revised: 01/09/2017] [Accepted: 01/12/2017] [Indexed: 10/20/2022]
Abstract
Substance use disorders (SUDs) in adolescence have negative long-term health effects, which can be mitigated through successful treatment. Caregivers play a central role in adolescent treatment involvement; however, studies have not examined treatment motivation and pressures to enter treatment in caregiver/adolescent dyads. Research suggests that internally motivated treatment (in contrast to coerced treatment) tends to lead to better outcomes. We used Self-determination theory (SDT) to examine intersecting motivational narratives among caregivers and adolescents in SUD treatment. Relationships between motivation, interpretation of caregiver pressures, adolescent autonomy, and relatedness were also explored. Adolescents in SUD treatment and their caregivers (NDyads=15) were interviewed about treatment experiences. Interviews were coded for treatment motivation, including extrinsic (e.g., motivated by punishment), introjected (e.g., motivated by guilt), and identified/integrated motivation (e.g., seeing a behavior as integral to the self). Internalization of treatment motivation, autonomy support/competence (e.g., caregiver support for adolescent decisions), and relatedness (e.g., acceptance and support) were also coded. Four dyadic categories were identified: agreement that treatment was motivated by the adolescent (intrinsic); agreement that treatment was motivated by the caregiver (extrinsic); agreement that treatment was motivated by both, or a shift towards adolescent control (mixed/transitional); and disagreement (adolescents and caregivers each claimed they motivated treatment; conflicting). Autonomy support and relatedness were most prominent in intrinsic dyads, and least prominent in extrinsic dyads. The mixed/transitional group was also high in autonomy support and relatedness. The extrinsic group characterized caregiver rules as an unwelcome mechanism for behavioral control; caregivers in the other groups saw rules as a way to build adolescent competence and repair relationships, and adolescents saw rules as indicating care rather than control. Adolescents with intrinsic motivations were the most engaged in treatment. Results suggest the importance of intrinsically motivated treatment, and highlight autonomy support and relatedness as mechanisms that might facilitate treatment engagement.
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Presence of diabetes mellitus in the 'Dawoodi Bohra youth community' in Udaipur, Rajasthan. Indian J Med Res 2014; 140:302-6. [PMID: 25297365 PMCID: PMC4216506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND & OBJECTIVES Diabetes mellitus is a major public health problem worldwide. With the rising incidence of diabetes in India, it becomes particularly relevant to ascertain its prevalence in various ethnic groups. The objective of this study was to find out the presence of diabetes mellitus in the 'Dawoodi Bohra Youth Community' and also to assess the factors responsible for it. METHODS A house-to-house study was conducted and 2179 subjects were questioned randomly; children below 18 yr of age were excluded. A questionnaire was given to each member and questions were also asked to test their level of awareness regarding diabetes which was graded on a 5-pointer scale where 1 meant 'very poor' and 5-'excellent'. Diabetes was diagnosed using GOD-POD (oxidase-peroxidase) method according to the WHO criteria. RESULTS Total number of diabetic subjects found was 246 (11.29%) with a mean age of 60.21±10.91 years. The condition was more common in males (58.94%). The highest prevalence was recorded in the age group of 65-69 yr (22.01%) and none had diabetes in the age group 11-24 yr. Pedigree analysis showed that 109 (44.30%) subjects had at least one affected relative and 23 (9.34%) had at least two diabetic family members; 52 were found to have parents with diabetes. On the 5-pointer scale, the overall care in diabetic subjects was 3.76±0.56 as compared to 2.86±0.60 in non-diabetic subjects (p<0.001). INTERPRETATION & CONCLUSIONS Our results indicated that the marital alliances, familial aggregation and lifestyle could be the major factors which enhanced the chances of diabetes in this community. This research work also reflected poor awareness among these people regarding their health and diseases.
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Coherent X-ray diffraction of copper islands under in situloading. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311097947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Visualization of anatomical structures of epigastric organs by use of automatically segmented 3-D ultrasound image volumes--first results. BIOMED ENG-BIOMED TE 2003; 47 Suppl 1 Pt 2:633-5. [PMID: 12465259 DOI: 10.1515/bmte.2002.47.s1b.633] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The detection and the staging of tumors and their metastases in parenchymatous organs of the epigastric organs today is improved by the enormous increase of imaging system's efficiency. For an increasing number of findings, which shall be dissected in intention to cure, the feasibility of diagnostics and therapy-planning based on sonograms was investigated. In 3-D US image volumes of approx. 20 patients, characteristic anatomical structures (e.g., vessels, abscesses, tumors) were detected by specifically adapted automatic computer-based segmentation and visualized. The detection of pathological findings, their quantification and their spatial assignment to anatomical main structures was essentially simplified by 3-D image acquisition and 2-D and 3-D visualization of segmented images.
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Regulation of the rat atrial natriuretic peptide gene after acute imposition of left ventricular pressure overload. Hypertension 1997; 30:1348-55. [PMID: 9403552 DOI: 10.1161/01.hyp.30.6.1348] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The upregulation of left ventricular (LV) atrial natriuretic peptide (ANP) mRNA is a highly conserved marker of cardiac hypertrophy. The aim of this study was to further examine the pathway leading to ANP induction during pressure overload of the heart. Systolic wall stress was imposed acutely on isovolumetrically beating rat hearts in a Langendorff apparatus (sigma-=300 x 10[3] dyne/cm2). Northern and Western blots revealed that elevated wall stress induced LV c-fos and c-jun mRNAs (3.5- and 3-fold, P<.05 after 60 minutes), c-Fos and c-Jun proteins (3.9- and 4.3-fold, P<.05 after 120 minutes), as well as ANP mRNA (2.2-fold, P<.05 after 120 minutes). ANP upregulation was prevented by inhibition of protein synthesis (cycloheximide). Electrophoresis mobility shift assays were performed to link c-Fos and c-Jun (ie, components of the heterodimeric transcription factor AP-1) and ANP induction. A putative AP-1 binding site within the rat ANP promoter (nucleotides -512 to -473) bound specifically to nuclear proteins of wall stress-stimulated hearts. Antibodies directed against c-Fos protein resulted in a shift of this DNA/protein complex, suggesting physical interaction between AP-1 and the ANP promoter. Myocardial transfection of promoter constructs revealed that after acute imposition of wall stress, this AP-1 site enhanced a reporter gene (8- to 10-fold compared with a minimal promoter, P<.05). Interestingly, nuclear extracts of stimulated hearts as well as pure AP-1 protein bound to a putative CRE site (nucleotides -613 to -584) as well. Like the AP-1 site, this cAMP-responsible element (CRE) site was found to enhance the transfected ANP promoter/reporter gene significantly (17.5-fold, P<.05). Mutation of either AP-1 or CRE sites did not decrease reporter gene activity, whereas mutation of both resulted in loss of inducibility. These experiments suggest that LV ANP regulation after acute wall stress includes the activation of AP-1 and/or CRE cis acting elements. However, the transient nature of c-fos and c-jun upregulation also suggests that AP-1 is not the only mediator of ANP induction in LV hypertrophy.
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The optimum pneumoperitoneum pressure for laparoscopic surgery in the rat model. A detailed cardiorespiratory study. Surg Endosc 1997; 11:915-8. [PMID: 9294272 DOI: 10.1007/s004649900486] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND There is increasing interest in the rat model of laparoscopic surgery. This study evaluates the cardiorespiratory effects of increasing CO2 pneumoperitoneum (PP) in the rat. METHODS Nine Sprague-Dawley rats were subjected to CO2 PP at pressures of 2, 5, 10, and 15 mmHg or control (no PP) under anesthesia. Catheters were placed in the femoral artery and the jugular vein to measure heart rate (HR), blood pressure (MAP), and arterial pH, PCO2, PO2, and HCO3. A thermistor probe in the aortic arch measured cardiac output (CO) and blood temperature (BT). RESULTS CO2 PP had no effect on CO, MAP, or BT at any pressure. CO2 PP greater than 5 mmHg caused significant bradycardia and CO2 PP greater than 10 mmHg caused significant respiratory acidosis. CONCLUSIONS CO2 PP pressures above 10 mmHg in rat should be avoided when performing laparoscopic surgery in the rat model.
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Induction of early immediate genes and programmed cell death following cardioplegic arrest in human hearts. Eur J Cardiothorac Surg 1997; 12:261-7. [PMID: 9288517 DOI: 10.1016/s1010-7940(97)00092-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
OBJECTIVE Under experimental conditions cardiac stress may induce early immediate genes. Of these, heat shock proteins like hsp 70 have been linked to preconditioning and cellular salvage. Protooncogenes like c-fos and c-jun act as transcription factors for other genes and may be involved in the regulation of programmed cell death. METHODS Patients, 30, undergoing elective coronary artery bypass grafting, received either cold antegrade St. Thomas II or Bretschneider or Hamburg cardioplegic solutions with ten patients in each group. Tissue from right atria was removed before cardiopulmonary bypass and following cardioplegic arrest and reperfusion. Tissues were examined by Northern blots, immunohistochemistry, and in situ nick-end labeling of fragmented DNA as evidence for programmed cell death. RESULTS There were no significant preoperative or operative differences between groups. Following cardioplegia and reperfusion, a significant induction of both protooncogene and heat shock protein 70 mRNA was observed. Whereas levels of hsp 70 were increased about two-fold in all groups (P < 0.05), induction of c-fos and c-jun was most pronounced following the Hamburg cardioplegic solution (P < 0.05 versus baseline and for differences to other groups). Induction on the protein level was confirmed using immunohistochemistry that furthermore, identified cardiac myocytes and endothelial cells being the cell types that expressed these genes. In contrast to prebypass samples, in situ nick-end labeling of fragmented DNA following cardioplegic arrest and reperfusion was positive, preponderately in subendocardial myocytes and endothelial cells. CONCLUSIONS Cold cardioplegia is a potent stimulus for induction of the early immediate genes examined in human hearts. Increased expression of protooncogenes may be deleterious to cardiac myocytes as indicated by in situ nick-end labeling of DNA fragments. Differences in gene induction may add additional information for the evaluation of different cardioplegic strategies.
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Abstract
BACKGROUND Induction of protooncogenes such as c-fos, c-jun, and EGR-1 has been implicated in cellular growth and differentiation. Heat-shock proteins (HSPs) such as hsp 70 may mediate resistance to ischemia after heat shock and ischemic preconditioning. The effects of cardioplegia on the regulation of these immediate early genes are unclear. METHODS Isolated rat hearts were subjected to different cold (5 degrees C) or normothermic (35 degrees C) cardioplegic solutions and reperfused with normothermic Krebs-Henseleit buffer. Right atrial biopsy specimens from patients undergoing coronary artery bypass grafting with cold cardioplegic arrest were taken before and after cardiopulmonary bypass. Analysis of immediate early gene messenger RNAs was performed using Northern blots. Related proteins were localized by immunohistochemistry. RESULTS In rat hearts, cold cardioplegia for 40 minutes with Bretschneider or St. Thomas' II solution followed by 40 minutes' reperfusion resulted in a significant increase in left ventricular c-fos, EGR-1, and c-jun messenger RNA levels (4.0-, 3.1-, and 3.0-fold, respectively, with Bretschneider solution and 3.7-, 2.8-, and 2.1-fold, respectively, with St. Thomas' II solution) compared with control hearts perfused at 35 degrees C with Krebs-Henseleit buffer. Normothermic cardioplegia with St. Thomas' II solution was without effect, whereas sequential perfusion with Krebs-Henseleit buffer at 5 degrees C and 35 degrees C resulted in a similar increase in protooncogene messenger RNA levels. Only cold Bretschneider solution was related to a 5.2-fold induction of hsp 70 messenger RNA levels. Likewise, rat atrial tissues and samples from patients after cardiopulmonary bypass displayed a significant induction of these immediate early genes. Monoclonal antibodies against c-FOS and HSP 70 proteins stained nuclei and perinuclear spaces of endothelial cells and cardiac myocytes. CONCLUSIONS Cold cardioplegic arrest and normothermic reperfusion are potent triggers for immediate early gene induction. Hypothermia emerged as the prime stimulus for the examined protooncogenes. In contrast, hsp 70 induction was dependent on the cardioplegic solution.
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The organization structure and regulatory elements of Chlamydomonas histone genes reveal features linking plant and animal genes. Curr Genet 1995; 28:333-45. [PMID: 8590479 DOI: 10.1007/bf00326431] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The genome of the green alga Chlamydomonas reinhardtii contains approximately 15 gene clusters of the nucleosomal (or core) histone H2A, H2B, H3 and H4 genes and at least one histone H1 gene. Seven non-allelic histone gene loci were isolated from a genomic library, physically mapped, and the nucleotide sequences of three isotypes of each core histone gene species and one linked H1 gene determined. The core histone genes are organized in clusters of H2A-H2B and H3-H4 pairs, in which each gene pair shows outwardly divergent transcription from a short (< 300 bp) intercistronic region. These intercistronic regions contain typically conserved promoter elements, namely a TATA-box and the three motifs TGGCCAG-G(G/C)-CGAG, CGTTGACC and CGGTTG. Different from the genes of higher plants, but like those of animals and the related alga Volvox, the 3' untranslated regions contain no poly A signal, but a palindromic sequence (3' palindrome) essential for mRNA processing is present. One single H1 gene was found in close linkage to a H2A-H2B pair. The H1 upstream region contains the octameric promoter element GGTTGACC (also found upstream of the core histone genes) and two specific sequence motifs that are shared only with the Volvox H1 promoters. This suggests differential transcription of the H1 and the core histone genes. The H1 gene is interrupted by two introns. Unlike Volvox H3 genes, the three sequenced H3 isoforms are intron-free. Primer-directed PCR of genomic DNA demonstrated, however, that at least 8 of the about 15 H3 genes do contain one intron at a conserved position. In synchronized C. reinhardtii cells, H4 mRNA levels (representative of all core histone mRNAs) peak during cell division, suggesting strict replication-dependent gene control. The derived peptide sequences place C. reinhardtii core histones closer to plants than to animals, except that the H2A histones are more animal-like. The peptide sequence of histone H1 is closely related to the V. carteri VH1-II (66% identity). Organization of the core histone gene in pairs, and non-polyadenylation of mRNAs are features shared with animals, whereas peptide sequences and enhancer elements are shared with higher plants, assigning the volvocalean histone genes a position intermediate between animals and plants.
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Angiotensin II-induced growth responses in isolated adult rat hearts. Evidence for load-independent induction of cardiac protein synthesis by angiotensin II. Circ Res 1995; 76:489-97. [PMID: 7859394 DOI: 10.1161/01.res.76.3.489] [Citation(s) in RCA: 107] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Cardiac myocyte hypertrophy often occurs in response to both hemodynamic and neurohumoral factors. To study whether activation of the renin-angiotensin system by itself may induce a cardiac growth response, the acute effects of angiotensin II on cardiac protein synthesis were studied in isolated rat hearts. New protein synthesis in isolated buffer-perfused adult rat hearts was measured by incorporation of [3H]phenylalanine into cardiac proteins during a 3-hour perfusion protocol. Angiotensin II (1 x 10(-8) mol/L), administered alone or in combination with the alpha 1-blocker prazosin (1 x 10(-7) mol/L), stimulated protein synthesis in both ventricles. The rate of [3H]phenylalanine incorporation into cardiac proteins was 3.9-fold (P < .005) and 2.6-fold (P < .01) higher in angiotensin II-perfused (n = 6) than in vehicle-perfused (n = 6) left and right ventricles, respectively. The induction of new protein synthesis by angiotensin II was blocked by the angiotensin II type 1 (AT1) receptor antagonist losartan (1 x 10(-7) mol/L, n = 5). To study the pathways of angiotensin signal transduction, protein kinase C (PKC)-epsilon as well as cardiac c-fos and c-jun mRNA levels were analyzed. Angiotensin II (1 x 10(-8) mol/L, n = 20) resulted in a transient translocation of PKC-epsilon from the cytosol to the cellular membrane. However, compared with phorbol ester stimulation (phorbol 12-myristate 13-acetate [PMA], 1 x 10(-7) mol/L; n = 20), angiotensin II effects on PKC translocation were significantly less pronounced and required a more prolonged stimulation.(ABSTRACT TRUNCATED AT 250 WORDS)
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Benchmark solutions for a model three-nucleon scattering problem. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1990; 42:1838-1840. [PMID: 9966926 DOI: 10.1103/physrevc.42.1838] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Predictions of the Paris N-N potential for three-nucleon continuum observables: Comparison of two approaches. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1990; 41:2538-2543. [PMID: 9966633 DOI: 10.1103/physrevc.41.2538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Neutron-induced deuteron breakup cross section at 10.3 MeV. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1989; 39:2133-2137. [PMID: 9955454 DOI: 10.1103/physrevc.39.2133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Nucleon-induced deuteron breakup: Analysis of 14.1 MeV data by rigorous Faddeev calculations with meson-exchange NN interactions. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1989; 39:384-390. [PMID: 9955212 DOI: 10.1103/physrevc.39.384] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Rigorous calculations and measurements of Ay( theta ) for n+d elastic-scattering and breakup processes. PHYSICAL REVIEW LETTERS 1988; 61:1565-1568. [PMID: 10038838 DOI: 10.1103/physrevlett.61.1565] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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