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Roth RS, Liden M, Huttner A. The urobiome in men and women: a clinical review. Clin Microbiol Infect 2023; 29:1242-1248. [PMID: 36028087 DOI: 10.1016/j.cmi.2022.08.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 08/12/2022] [Accepted: 08/13/2022] [Indexed: 11/15/2022]
Abstract
BACKGROUND Antibiotic therapy alone is unable to control recurrent urinary tract infection (UTI); uropathogens have become multiresistant, and alternative strategies are needed. Far from sterile, the urinary tract contains various low-biomass microbiota, some of whose members appear to protect against clinical UTI. OBJECTIVES This narrative review summarizes (a) the current knowledge of male and female urobiomes in healthy and diseased states, as well as their interplay among sexual partners and (b) clinical trials to date assessing probiotic and other nonantibiotic measures to reduce UTI. SOURCES We used the PubMed interface to search Ovid Medline for articles describing urogenital flora, UTI, UTI dysbiosis, the effects of sexual intercourse on urogenital flora, and clinical trials of probiotics as UTI prophylaxis. CONTENT The healthy urobiome of women contains several Lactobacillus species, some of which may impede Escherichia coli growth in the urinary tract. Although Lactobacilli have been found in male urethral microbiota, their presence in male bladder microbiota is less certain. Distal male urethral and vaginal microbiomes of male and sexual female partners influence one another, but more research is needed on the direct interplay of their full urobiomes. Clinical trials assessing the therapeutic potential of Lactobacilli have been largely underpowered and highly varied in tested formulations and routes and frequencies of administration; as such, they have failed to show a clear benefit. Faecal microbiota transplantation for recurrent Clostridium difficile infection was shown, in a retrospective study of seven patients, to reduce recurrent UTI as a side effect. IMPLICATIONS The urobiome in men and women is complex, variable, and still understudied. Although there is hope that Lactobacilli and faecal microbial transplantation could be future nonantibiotic options for recurrent UTI, both require more pharmacologic and clinical research to identify optimal preparations and routes of administration.
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Affiliation(s)
- Romain S Roth
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
| | - Mia Liden
- University of Geneva, Faculty of Medicine, Geneva, Switzerland
| | - Angela Huttner
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland; University of Geneva, Faculty of Medicine, Geneva, Switzerland; Center for Clinical Research, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland.
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Affiliation(s)
- J K Roth
- Michigan Head Pain and Neurological Institute, Ann Arbor, MI 48104, USA.
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Abstract
OBJECTIVE This study examined the relationship of level of educational (LOE) achievement to pain experience, affective disturbance, and perceived disability among women with chronic pelvic pain presenting for pain treatment. METHODS 187 patients completed a battery of self-report inventories assessing pain, psychological status, and functional ability. Educational attainment was stratified across five levels from "less than high school" to "graduate/professional school." RESULTS Significant inverse associations were found between lower educational achievement and more severe pain, somatic preoccupation, emotional suffering and guardedness, and functional impairment. No differences were obtained across the groups for age, duration of pain, or symptoms of depression. CONCLUSIONS These data provide support for the importance of socioeconomic factors, particularly LOE, in furthering our understanding of the morbidity observed among women suffering chronic pelvic pain.
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Affiliation(s)
- R S Roth
- Department of Physical Medicine and Rehabilitation, University of Michigan Health System, Ann Arbor, MI 48109, USA.
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Tolédano JC, Berry RS, Brown PJ, Glazer AM, Metselaar R, Pandey D, Perez-Mato JM, Roth RS, Abrahams SC. Nomenclature of magnetic, incommensurate, composition-changed morphotropic, polytype, transient-structural and quasicrystalline phases undergoing phase transitions. II. Report of an IUCr Working Group on Phase Transition Nomenclature. Acta Crystallogr A 2001; 57:614-26. [PMID: 11526310 DOI: 10.1107/s0108767301006821] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2001] [Accepted: 04/19/2001] [Indexed: 11/10/2022] Open
Abstract
A general nomenclature applicable to the phases that form in any sequence of transitions in the solid state has been recommended by an IUCr Working Group [Acta Cryst. (1998). A54, 1028-1033]. The six-field notation of the first Report, hereafter I, was applied to the case of structural phase transitions, i.e. to transformations resulting from temperature and/or pressure changes between two crystalline (strictly periodic) phases involving modifications to the atomic arrangement. Extensive examples that illustrate the recommendations were provided. This second Report considers, within the framework of a similar six-field notation, the more complex nomenclature of transitions involving magnetic phases, incommensurate phases and transitions that occur as a function of composition change. Extension of the nomenclature to the case of phases with less clearly established relevance to standard schemes of transition in equilibrium systems, namely polytype phases, radiation-induced and other transient phases, quasicrystalline phases and their transitions is recommended more tentatively. A uniform notation for the translational periodicity, propagation vector or wavevector for magnetic and/or incommensurate substances is specified. The notation adopted for incommensurate phases, relying partly on the existence of an average structure, is also consistent with that for commensurate phases in a sequence. The sixth field of the nomenclature is used to emphasize the special features of polytypes and transient phases. As in I, illustrative examples are provided for each category of phase sequence.
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Affiliation(s)
- J C Tolédano
- Laboratoire des Solides Irradiés and Department of Physics, Ecole Polytechnique, F-91128 Palaiseau CEDEX, France
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Abstract
PURPOSE This study determined whether there is an association between psychological and socioeconomic characteristics and the long-term outcome of operative treatment for patients with sensory neurogenic thoracic outlet syndrome (N-TOS). METHODS Clinical records, preoperative psychological testing results, and long-term follow-up questionnaire data were reviewed for consecutive patients who underwent surgery for N-TOS from 1990 to 1999. Multivariate logistic regression models were developed as a means of identifying independent risk factors for postoperative disability. RESULTS Operative decompression of the brachial plexus via a supraclavicular approach was performed for upper extremity pain and paresthesia with no mortality and minimal morbidity in 170 patients. After an average follow-up period of 47 months, 65% of patients reported improved symptoms, and 64% of patients were satisfied with their operative outcome. However, 35% of patients remained on medication, and 18% of patients were disabled. Preoperative factors associated with persistent disability include major depression (odds ratio [OR], 15.7; P =.02), not being married (OR, 7.9; P =.04), and having less than a high school education (OR, 8.1; P =.09). CONCLUSION Operative decompression was beneficial for most patients. Psychological and social factors, including depression, marital status, and education, are associated with self-reported disability. The impact of the preoperative treatment of depression on the outcome of TOS decompression should be studied prospectively.
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Affiliation(s)
- D A Axelrod
- Department of Surgery, University of Michigan Hospitals, Ann Arbor, USA
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Wilkins EG, Cederna PS, Lowery JC, Davis JA, Kim HM, Roth RS, Goldfarb S, Izenberg PH, Houin HP, Shaheen KW. Prospective analysis of psychosocial outcomes in breast reconstruction: one-year postoperative results from the Michigan Breast Reconstruction Outcome Study. Plast Reconstr Surg 2000; 106:1014-25; discussion 1026-7. [PMID: 11039373 DOI: 10.1097/00006534-200010000-00010] [Citation(s) in RCA: 347] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
In the past decade, changing attitudes toward breast reconstruction among both patients and providers have led a growing number of women to seek breast reconstruction after mastectomy. Although investigators have documented the psychological, social, emotional, and functional benefits of breast reconstruction, little research has evaluated the effects of procedure choice on these outcomes. The current study prospectively evaluated and compared psychosocial outcomes for three common options for mastectomy reconstruction: tissue expander/implant, pedicle TRAM, and free TRAM techniques. In a prospective cohort design, patients undergoing postmastectomy reconstruction for the first time with expander/implant, pedicle TRAM, or free TRAM procedures were recruited from 12 centers and 23 plastic surgeons in the United States and Canada. Before reconstruction and at 1 year after reconstruction, patients were evaluated by a battery of questionnaires consisting of both generic and condition-specific surveys. Outcomes assessed included emotional well-being, vitality, general mental health, social functioning, functional well-being, social well-being, and body image. Baseline (preoperative) scores and the change in scores (the difference between postoperative and preoperative scores) were compared across procedure types using t tests and analysis of covariance. Preoperative and 1-year postoperative surveys were obtained from 273 patients. Procedure type was reported in 250 patients, of whom 56 received implant reconstructions, 128 pedicle TRAM flaps, and 66 free TRAM flaps. A total of 161 immediate and 89 delayed reconstructions were performed. Among women receiving immediate reconstruction, significant improvements were observed in all psychosocial variables except body image. However, no significant effects of procedure type on these changes over time existed. Similarly, delayed reconstruction patients had significant increases in emotional well-being, vitality, general mental health, functional well-being, and body image. Although the choice of reconstructive technique did not significantly impact most of these outcomes, significant differences existed among procedure types for three psychosocial subscales. Patients undergoing delayed expander/implant reconstructions reported greater improvements in vitality and social well-being relative to women receiving delayed TRAM procedures. By contrast, delayed TRAM patients noted significantly greater gains in body image compared with women choosing delayed expander-implant reconstruction. The authors conclude that both immediate and delayed breast reconstructions provide substantial psychosocial benefits for mastectomy patients. Although the choice of reconstructive procedure does not seem to significantly affect improvements in psychosocial status with immediate reconstruction, our data suggest that procedure type does have a significant effect on gains in vitality and body image for women undergoing delayed reconstruction.
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Affiliation(s)
- E G Wilkins
- Section of Plastic and Reconstructive Surgery, University of Michigan Health System, Ann Arbor 48109-0340, USA.
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Reed BD, Haefner HK, Punch MR, Roth RS, Gorenflo DW, Gillespie BW. Psychosocial and sexual functioning in women with vulvodynia and chronic pelvic pain. A comparative evaluation. J Reprod Med 2000; 45:624-32. [PMID: 10986680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
OBJECTIVE To determine whether women with vulvodynia differ from women with chronic pelvic pain and normal controls in their psychological functioning, somatic preoccupation, pain experience and sexual functioning. STUDY DESIGN Cross-sectional, self-report study of women presenting to University of Michigan specialty and general clinics for the treatment of vulvodynia or chronic pelvic pain or seeking a routine gynecologic examination. All subjects completed questionnaires assessing demographic characteristics, pain, depressive symptoms, general affective state, marital adjustment, functional activity, somatic complaints, exposures, and medical and sexual history. Univariate analyses, chi 2 tests, analyses of variance and logistic regression were used to assess associations between these variables and the diagnostic category. RESULTS Women with vulvodynia (n = 31) were similar to asymptomatic control women (n = 23) in demographic characteristics, sexual relationship variables, sexual behaviors, current and past depression, somatic sensitivity, and history of sexual or physical abuse. Women with chronic pelvic pain (n = 18) were younger and less educated than the other two groups and were more likely to have a history of physical and sexual abuse, to report recent depression and to screen positive for current depression, to have more work absences and to have more somatic complaints. CONCLUSION Women with vulvodynia are psychologically similar to control women but differ significantly from women with chronic pelvic pain. A primary psychological cause of vulvodynia is not supported.
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Affiliation(s)
- B D Reed
- Department of Family Medicine, University of Michigan, Ann Arbor 48109, USA.
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Geisser ME, Roth RS, Theisen ME, Robinson ME, Riley JL. Negative affect, self-report of depressive symptoms, and clinical depression: relation to the experience of chronic pain. Clin J Pain 2000; 16:110-20. [PMID: 10870723 DOI: 10.1097/00002508-200006000-00004] [Citation(s) in RCA: 121] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE The goal of this study was to examine the relative importance of global affective distress, self-report of depressive symptoms, and presence or absence of major depression to the experience of chronic pain. SETTING A multidisciplinary pain program at a university medical center was the setting for this study. PATIENTS Subjects in this study were 211 consecutive patients with chronic pain. OUTCOME MEASURES Pain duration, compensation, and litigation status were controlled for in the statistical analyses, as each correlated significantly with at least one of the measures of affect. Global affective distress was assessed using the Global Severity Index (GSI) from the Brief Symptom Inventory. The Beck Depression Inventory and the Center for Epidemiological Studies Depression Scale were used as measures of self-report of depressive symptoms. Presence or absence of major depression was based on DSM-IV criteria. RESULTS AND CONCLUSIONS The GSI, Beck Depression Inventory, and Center for Epidemiological Studies Depression Scale were significantly correlated with each measure of the experience of pain, although clinical depression was only significantly related to self-reported disability and negative thoughts about pain. The self-report measures of depression maintained their relation to the dependent measures when the somatic items from the scales were removed, suggesting that the relations were not spuriously due to the influence of pain symptoms on the scales. When examining the unique contribution of each variable to the experience of pain (by simultaneously controlling for the other measures of affect), the GSI was uniquely related to the sensory and affective components of pain. Self-report of depressive symptoms was more highly related to a measure of the evaluative component of pain and uniquely related to self-reported disability and negative thoughts about pain. The results are discussed within the context of theoretical models of the relation between pain and affect, and suggestions for future research are presented.
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Affiliation(s)
- M E Geisser
- University of Michigan Health System, Ann Arbor 48108, USA.
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Abstract
OBJECTIVE To examine the relation between pain patients' knowledge of pain diagnosis and their satisfaction with pain treatment. It was hypothesized that myofascial pain (MP) patients would be less knowledgeable regarding their diagnosis and less satisfied with the results of pain treatment. DESIGN Cross-sectional. SETTING Multidisciplinary pain clinic. PATIENTS Patients (n=65) were divided into two groups after multidisciplinary assessment: MP patients (n=30) and a mixed group of chronic pain patients (MCP) (n=35) with neurologic or rheumatologic disorders. MAIN OUTCOME MEASURES Patient self-report of their knowledge of pain diagnosis and scores on standardized measures of pain intensity, depressive symptoms, and functional disability. RESULTS MP patients were significantly less accurate in identifying their diagnosis and the source of their pain and were more likely to believe they suffered a physiologic disturbance "more serious and different" than their physicians had suggested. MP patients were also significantly more dissatisfied with the treatment for pain by physicians and reported particular dissatisfaction with the informational aspects of physician-patient communication. No group differences were obtained for measures of pain severity, depression, disability, pain duration, or compensation/litigation status. CONCLUSION MP patients appear to have less accurate beliefs regarding their pain symptoms and express more dissatisfaction with physician efforts to treat their pain. These findings emphasize the importance of patient education as a component of chronic pain intervention, particularly for MP patients.
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Affiliation(s)
- R S Roth
- Department of Anesthesiology, University of Michigan Medical Center, Ann Arbor 48109, USA
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Segar ML, Katch VL, Roth RS, Garcia AW, Portner TI, Glickman SG, Haslanger S, Wilkins EG. The effect of aerobic exercise on self-esteem and depressive and anxiety symptoms among breast cancer survivors. Oncol Nurs Forum 1998; 25:107-13. [PMID: 9460778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
PURPOSE/OBJECTIVES To evaluate the effects of 10 weeks of aerobic exercise on depressive and anxiety symptoms and self-esteem of breast cancer survivors. DESIGN Experimental, crossover. SETTING Midwestern university town. SAMPLE Twenty-four breast cancer survivors (mean time following surgery 41.8 months; ranging from 1 to 99 months) recruited via mail and cancer support groups. The mean age of the sample was 48.9 years. METHODS Subjects were assigned randomly into exercise (EX), exercise-plus-behavior modification (EX + BM), and control groups. EX and EX + BM groups exercised aerobically four days/week at > or = 60% of age-predicted maximum heart rate for 10 weeks. Data were collected pretest, post-test, and crossover (12 weeks following post-test). Because pretest or post-test scores showed no statistical differences between EX and EX + BM groups, data were combined to form one group. MAIN RESEARCH VARIABLES Aerobic exercise (four days/ week; 30-40 minutes/session), depression, (Beck Depression inventory), anxiety (Speilberger State-Trait Anxiety Inventory), and self-esteem (Rosenberg Self-Esteem Inventory). FINDINGS Pre- to post-test analyses revealed that women who exercised had significantly less depression and state and trait anxiety over time compared to controls. After the crossover, the control group demonstrated comparable improvements in both depressive and state anxiety scores. Self-esteem did not change significantly. Subjects who received exercise recommendations from their physicians exercised significantly more than subjects who received no recommendation. CONCLUSIONS Mild to moderate aerobic exercise may be of therapeutic value to breast cancer survivors with respect to depressive and anxiety symptoms but not to self-esteem. A physician's recommendation to exercise appears to be an important factor in a patient's exercise adherence. IMPLICATIONS FOR NURSING PRACTICE To Improve depressive and anxiety symptoms following breast cancer surgery, healthcare professionals should consider recommending mild to moderate exercise.
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Affiliation(s)
- M L Segar
- Division of Kinesiology, School of Public Health, University of Michigan, Ann Arbor, USA
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Blankenship ME, Rowlett J, Timby JW, Roth RS, Jones RE. Giant lymph node hyperplasia (Castleman's disease) presenting with chylous pleural effusion. Chest 1997; 112:1132-3. [PMID: 9377933 DOI: 10.1378/chest.112.4.1132] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
A case of giant lymph node hyperplasia (Castleman's disease) with an original presentation of a chylous pleural effusion occurred in a female adolescent. CT scans showed mediastinal lymphadenopathy. Lymph node biopsy was consistent with the plasmacytic variant of Castleman's disease.
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Affiliation(s)
- M E Blankenship
- Department of Surgery, Memorial Medical Center, Savannah, Ga, USA
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Geisser ME, Roth RS, Robinson ME. Assessing depression among persons with chronic pain using the Center for Epidemiological Studies-Depression Scale and the Beck Depression Inventory: a comparative analysis. Clin J Pain 1997; 13:163-70. [PMID: 9186024 DOI: 10.1097/00002508-199706000-00011] [Citation(s) in RCA: 364] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
OBJECTIVE This study examined the ability of two self-report questionnaires, the Beck Depression Inventory (BDI) and the Center for Epidemiological Studies-Depression Scale (CES-D), to discriminate between chronic pain patients with and without major depression. Since previous research has suggested that medical conditions such as chronic pain can influence the endorsement of items that measure neurovegetative symptoms of depression, the accuracy of each of these questionnaires was also assessed eliminating these items. SUBJECTS These included 132 consecutive patients with chronic pain, 44 of whom were diagnosed as suffering from major depression according to DSM-IV criteria. METHODS Patients were administered a battery of questionnaires that included the CES-D and BDI. They were also interviewed by a clinical psychologist to determine the presence or absence of major depression. RESULTS Both questionnaires were able to discriminate significantly between persons with and without major depression. Removal of the somatic items on each questionnaire did not improve their accuracy. Discriminant function analysis revealed an optimal cut-off score of 21 for the BDI, and 27 for the CES-D. Overall hit rates at these cut-offs for the two questionnaires were comparable, while the CES-D had somewhat better sensitivity (81.8% vs. 68.2%). Conversely, the BDI had slightly better specificity (78.4% vs. 72.7%). CONCLUSION The results suggest that both questionnaires have good predictive validity among chronic pain patients, and decisions regarding the use of one questionnaire rather than the other may depend upon the goals of the user and the setting within which the questionnaire is used.
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Affiliation(s)
- M E Geisser
- Department of Physical Medicine and Rehabilitation, University of Michigan Medical Center, Ann Arbor 48108, USA
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Geisser ME, Roth RS, Bachman JE, Eckert TA. The relationship between symptoms of post-traumatic stress disorder and pain, affective disturbance and disability among patients with accident and non-accident related pain. Pain 1996; 66:207-14. [PMID: 8880842 DOI: 10.1016/0304-3959(96)03038-2] [Citation(s) in RCA: 168] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Recent studies have reported a high prevalence of symptoms of post-traumatic stress disorder (PTSD) among individuals with chronic pain. Studies suggest that persons with pain and PTSD also display higher levels of affective disturbance. In the present study we examined self-reports of pain, affective disturbance, and disability among pain patients with and without symptoms of PTSD. Patients without PTSD symptoms were further subdivided into persons whose pain was the result of an accident or insidious in onset. Thus, three groups were examined: (1) persons with accident related pain and high PTSD symptoms (Accident/High PTSD); (2) persons with no or few symptoms of PTSD whose pain was accident related (Accident/Low PTSD); and (3) patients whose pain was not accident related and did not have PTSD symptoms (No Accident). No Accident patients were older than persons with accident related injuries, and both accident related pain groups were more likely than No Accident patients to be involved in litigation or receiving compensation. Thus, these variables were controlled for in the statistical analyses. Self-report of pain was also included as a covariate in the analyses examining group differences in affective disturbance and disability. Accident/High PTSD patients displayed higher levels of self-reported pain compared to the other two groups. The Accident/High PTSD group also had the highest levels of affective disturbance. Both accident groups tended to report greater disability compared to patients whose pain was not accident related. These findings suggest that PTSD symptoms in chronic pain patients are associated with increased pain and affective distress. Accident related pain, even without the presence of PTSD symptoms, appears to be associated with greater disability. The results indicate that the identification and treatment of PTSD symptoms in refractory pain patients may be a critical albeit subtle factor in the effective management of suffering and disability in this population.
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Affiliation(s)
- M E Geisser
- Department of Physical Medicine and Rehabilitation, University of Michigan Medical Center, Ann Arbor 48109, USA
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Warschausky S, MacKenzie J, Roth RS, Bartlett RH. Maternal distress and perceptions of infant development following extracorporeal membrane oxygenation and conventional ventilation for persistent pulmonary hypertension. Child Care Health Dev 1995; 21:53-65. [PMID: 7697835 DOI: 10.1111/j.1365-2214.1995.tb00410.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Neurodevelopmental outcome and concurrent maternal distress were examined for infants who suffered persistent pulmonary hypertension at birth and were treated with either extracorporeal membrane oxygenation (ECMO) (n = 19) or conventional ventilation (CV) (n = 15). Mothers were asked to complete inventories assessing their infant's (mean age 8.74 months) developmental growth as well as their own psychological health. Relevant sociodemographic and treatment parameters were also entered into the analysis. The results indicated that ECMO and CV infants did not differ on developmental indices and impairment rates were 15-23% respectively, similar to previous reports. In addition, ECMO and CV mothers did not differ in their reports of psychological distress. Correlational analyses revealed that length of treatment for ECMO but not CV infants significantly predicted developmental delay and maternal distress. For CV mothers, maternal distress was associated with the perception of delayed language. The results are discussed in terms of the limited morbidity associated with ECMO and CV interventions and the possible role of a 'vulnerable child syndrome' in understanding the maternal-infant relationship following ECMO therapy.
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Affiliation(s)
- S Warschausky
- Department of Physical Medicine and Rehabilitation, University of Michigan, Medical Center, Ann Arbor 48109-0050
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Fingeroth JD, Roth RS, Talcott JA, Rinaldi MG. Zygomycosis due to Mucor circinelloides in a neutropenic patient receiving chemotherapy for acute myelogenous leukemia. Clin Infect Dis 1994; 19:135-7. [PMID: 7948514 DOI: 10.1093/clinids/19.1.135] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Mucor circinelloides form circinelloides has rarely been associated with human disease, even in immunocompromised patients. We report a case of cutaneous zygomycosis caused by M. circinelloides in a 23-year-old neutropenic woman receiving consolidation chemotherapy for acute myelogenous leukemia. The organism was exquisitely susceptible to amphotericin B. Despite the fact that the patient was profoundly neutropenic for an additional 3 weeks, the lesions began to resolve during therapy, and no surgical debridement was required.
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Affiliation(s)
- J D Fingeroth
- Laboratory of Infectious Diseases, Dana-Farber Cancer Institute, Boston, Massachusetts 02115
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Fishman JA, Roth RS, Zanzot E, Enos EJ, Ferraro MJ. Use of induced sputum specimens for microbiologic diagnosis of infections due to organisms other than Pneumocystis carinii. J Clin Microbiol 1994; 32:131-4. [PMID: 8126167 PMCID: PMC262982 DOI: 10.1128/jcm.32.1.131-134.1994] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The optimal diagnostic approach to pneumonia provides a rapid microbiologic identification of pulmonary pathogens by the least invasive means. The technique of sputum induction has been useful in the evaluation of patients with Pneumocystis carinii or mycobacterial pneumonia. It is not known whether induced sputum samples are preferable for the detection of pathogens other than P. carinii or mycobacteria. Microbiologic yields were evaluated from identically processed induced and conventional sputum samples collected from 509 consecutive patients. No statistically significant differences were found between the microbiologic yields of induced and spontaneous sputum samples. Bacterial pathogens were isolated in 19.6% of induced and 23.5% of routine specimens. Mycobacteria were cultured from 13.1% of routine and 9.4% of induced specimens. Non-Candida albicans fungi grew from 24% of routine and 20% of induced specimens. The process of sputum induction with aerosolized hypertonic saline did not alter either the purulence or the bacterial quantitation of Gram-stained sputum specimens. Sputum induction has been useful for the cytologic diagnosis of malignancy, for the diagnosis of pneumocystosis and tuberculosis, and in patients unable to spontaneously produce sputum samples. The use of induced sputum samples for the diagnosis of other infections may not be necessary when routine sputum specimens are available.
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Affiliation(s)
- J A Fishman
- Infectious Disease Unit, Massachusetts General Hospital, Boston
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17
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Burton BP, Rawn CJ, Roth RS, Hwang NM. Phase Equilibria and Crystal Chemistry in Portions of the System SrO-CaO-Bi 2O 3-CuO, Part IV- The System CaO-Bi 2O 3-CuO. J Res Natl Inst Stand Technol 1993; 98:469-516. [PMID: 28053484 PMCID: PMC4907701 DOI: 10.6028/jres.098.034] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Accepted: 05/03/1993] [Indexed: 06/06/2023]
Abstract
New data are presented on the phase equilibria and crystal chemistry of the binary systems CaO-Bi2O3 and CaO-CuO and the ternary CaO-Bi2O3-CuO. Symmetry data and unit cell dimensions based on single crystal and powder x-ray diffraction measurements are reported for several of the binary CaO-Bi2O3 phases, including corrected compositions for Ca4Bi6O13 and Ca2Bi2O5. The ternary system contains no new ternary phases which can be formed in air at ~700-900 °C.
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Affiliation(s)
- B P Burton
- National Institute of Standards and Technology, Gaithersburg, MD 20899-0001
| | - C J Rawn
- National Institute of Standards and Technology, Gaithersburg, MD 20899-0001
| | - R S Roth
- National Institute of Standards and Technology, Gaithersburg, MD 20899-0001
| | - N M Hwang
- The Korea Standards Research Institute, Taedok Science Town, Taejon, Chungnam, 305-606 Republic of Korea
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Fishman JA, Queener SF, Roth RS, Bartlett MS. Activity of topoisomerase inhibitors against Pneumocystis carinii in vitro and in an inoculated mouse model. Antimicrob Agents Chemother 1993; 37:1543-6. [PMID: 8395791 PMCID: PMC188010 DOI: 10.1128/aac.37.7.1543] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Five topoisomerase II inhibitors (amsacrine [m-AMSA], two epipodophyllotoxins, and two quinolones) and the alkaloid camptothecin (a topoisomerase I inhibitor) were evaluated to assess their activities against Pneumocystis carinii. In vitro, both etoposide (VP-16) and teniposide (VM-26) at 1 microgram/ml suppressed P. carinii growth. Amsacrine was toxic to P. carinii and to the feeder cells in vitro. Camptothecin suppressed the growth of P. carinii in vitro only at 100 micrograms/ml. Studies in immunosuppressed mice demonstrated the efficacy of teniposide against P. carinii pneumonia, but successful administration of teniposide was schedule dependent with significant toxicity at therapeutic dosages.
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Affiliation(s)
- J A Fishman
- Infectious Disease Unit, Massachusetts General Hospital, Boston
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19
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Roth RS, Rawn CJ, Burton BP, Beech F. Phase Equilibria and Crystal Chemistry in Portions of the System SrO-CaO-Bi 2O 3-CuO, Part II-The System SrO-Bi 2O 3-CuO. J Res Natl Inst Stand Technol 1990; 95:291-335. [PMID: 28179779 PMCID: PMC4959399 DOI: 10.6028/jres.095.029] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/02/1990] [Indexed: 06/06/2023]
Abstract
New data are presented on the phase equilibria and crystal chemistry of the binary systems Sr0-Bi203 and SrO-CuO and the ternary system SrO-Bi2O3-CuO. Symmetry data and unit cell dimensions based on single crystal and powder x-ray diffraction measurements are reported for all the binary SrO-Bi2O3 phases, including a new phase identified as Sr6Bi2O9. The ternary system contains at least four ternary phases which can be formed in air at ~900 °C. These are identified as Sr2Bi2CuO6, Sr8Bi4Cu5O19+x , Sr3Bi2Cu2O8 and a solid solution (the Raveau phase) which, for equilibrium conditions at ~900 °C, corresponds approximately to the formula Sr1.8-x Bi2.2+x Cu1±x/2O z .(0.0⩽x⩽~0.15). Superconductivity in this phase apparently occurs only in compositions that correspond to negative values of x. Compositions that lie outside the equilibrium Raveau-phase field often form nearly homogeneous Raveau-phase products. Typically this occurs after relatively brief heat treatments, or in crystallization of a quenched melt.
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Affiliation(s)
- R S Roth
- National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - C J Rawn
- National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - B P Burton
- National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - F Beech
- National Institute of Standards and Technology, Gaithersburg, MD 20899
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20
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Beech F, Miraglia S, Santoro A, Roth RS. Neutron study of the crystal structure and vacancy distribution in the superconductor Ba2YCu. Phys Rev B Condens Matter 1987; 35:8778-8781. [PMID: 9941250 DOI: 10.1103/physrevb.35.8778] [Citation(s) in RCA: 169] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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21
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Abstract
A telephone video transmission unit was utilized to assist in the attachment of mothers to their transported sick infants. To evaluate its effectiveness, the number of telephone calls to the ICN made by the mothers using the unit was used as a variable to "quantify" interest in their newborns; this was compared with the number of calls made by a matched group of mothers who did not utilize the videophone. There was a significantly larger number of calls made by the study mothers both while hospitalized and after discharge when they no longer had use of the videophone. Use of the unit appeared to alleviate some maternal anxieties and encouraged early endearment by the study mothers. How this affects the long-term relationship between infant and mother will require further follow-up investigation.
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22
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Abstract
Sixty of 63 newborn infants weighing less than 1,250 gm, admitted consecutively to the Intensive Care Nursery during a 15-month period, were prospectively investigated for the incidence of intraventricular hemorrhage by early computerized tomography or by autopsy. Nineteen of the 60 infants had evidence of IVH. The incidence of IVH was correlated with the presence of possible neonatal, obstetrical, asphyxial, or therapeutic risk factors. There was a significant difference in only one of the risk factors: birth outside the perinatal center. Fifteen of 27 outborn infants (56%) developed IVH, whereas only four of 33 inborn infants (12%) developed IVH (P less than 0.001). There were no statistically significant differences in maternal obstetrical risk factors, infant risk factors, or indices of birth asphyxia in the inborn compared with the outborn infants. However, perinatal therapeutic risk factors differed between the two groups. Outborn infants were less likely to have received betamethasone (P less than 0.001), were less likely to have their arterial blood gases monitored and stabilized during the first 20 minutes after birth (P less than 0.001), and were given more bicarbonate (P less than 0.001) and more boluses of fluid intravenously (P less than 0.02). The risk of IVH in very low birth-weight infants may be significantly decreased by therapeutic factors at birth. Maternal transport to a perinatal center and intensive neonatal resuscitation may contribute to decreasing the incidence of intraventricular hemorrhage.
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23
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Tucker DM, Stenslie CE, Roth RS, Shearer SL. Right frontal lobe activation and right hemisphere performance. Decrement during a depressed mood. Arch Gen Psychiatry 1981; 38:169-74. [PMID: 7212943 DOI: 10.1001/archpsyc.1981.01780270055007] [Citation(s) in RCA: 202] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Evidence from psychiatric patients has suggested that depressive affect may coincide with a decrement in the functioning of the right cerebral hemisphere. We have observed that college students who reported greater depression also reported less vivid imagery. Students undergoing experimental induction of depressive and euphoric moods in the laboratory showed an auditory attentional bias and impaired imagery during the depression condition, while their arithmetic task performance was unchanged. A second mood-induction experiment indicated a depressed mood to be characterized by asymmetrical EEG activation over the frontal lobes, with relatively greater activity in the right frontal region. These observations suggest that anterior regions of the brain may modulate the differential effects of emotional arousal on the information-processing capacities of the cerebral hemispheres.
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24
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Miller C, Clyman RI, Roth RS, Sniderman SH, Ballard RA, Henning D, Riedel P, Rosen A, Burden L. Control of oxygenation during the transport of sick neonates. Pediatrics 1980; 66:117-9. [PMID: 7402772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
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25
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Clyman RI, Roth RS, Sniderman SH, Charrier J. Does a belief in a 'just world' affect health care providers' reactions to perinatal illness? J Med Educ 1980; 55:538-539. [PMID: 7381907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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26
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Mintz L, Ballard RA, Sniderman SH, Roth RS, Drew WL. Nosocomial respiratory syncytial virus infections in an intensive care nursery: rapid diagnosis by direct immunofluorescence. Pediatrics 1979; 64:149-53. [PMID: 382079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
A nosocomial outbreak of respiratory syncytial virus infections involved 8 of 17 infants in an Intensive Care Nursery and one additional infant in the adjoining Newborn Nursery. Immunofluorescent staining of nasopharyngeal specimens was positive in six of seven virologically confirmed cases (86%). One additional case with negative viral cultures was also identified by this technique. Viral isolation in tissue cultures required an average of 4.9 days, whereas results of immunofluorescent studies were available in two to four hours. Rapid identification of infected infants by immunofluorescence permitted prompt institution of infection control measures.
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Clyman RI, Sniderman SH, Ballard RA, Roth RS. What pediatricians say to mothers of sick newborns: an indirect evaluation of the counseling process. Pediatrics 1979; 63:719-23. [PMID: 440892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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28
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Minor DB, Roth RS, Parker HS, Brower WS. Phase Equilibria and Crystal Chemistry of Rubidium Niobates and Rubidium Tantalates. J Res Natl Bur Stand (1977) 1977; 82:151-165. [PMID: 34565963 DOI: 10.6028/jres.082.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
The phase equilibria relations and crystal chemistry of portions of the Rb2O-Nb2O5 and Rb2O-Ta2O5 systems were investigated for structures potentially useful as ionic conductors. A hexagonal tungsten bronze-type (HTB) structure was found in both systems as well as three hexagonal phases with mixed HTB-pyrochlore type structures. Ion exchange experiments between various alkali ions are described for several phases. Unit cell dimensions and x-ray diffraction powder patterns are reported.
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Affiliation(s)
- D B Minor
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - R S Roth
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - H S Parker
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - W S Brower
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
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29
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Waring JL, Roth RS, Brower WS, Harding CA. Investigation of Calcium Aluminate Cement Phases Under High Gaseous Pressure. J Res Natl Bur Stand (1977) 1977; 82:167-172. [PMID: 34565964 DOI: 10.6028/jres.082.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
The chemical degradation of refractory cement castable liners is important in the coal gasification process. The system CaO-Al2O3-H2O has been investigated at high temperature and pressure. A pseudobinary reaction diagram was constructed for the system CaO-Al2O3-H2O in steam at 1000 psig. Several experiments were conducted in the CaO-Al2O3-H2O system in CO2, CH4, and CO.
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Affiliation(s)
- J L Waring
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - R S Roth
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - W S Brower
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - C A Harding
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
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30
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Abstract
15 seminary students who regularly practiced a form of Christian meditation were given the Minnesota Multiphasic Personality Inventory (MMPI). Electroencephalographic (EEG) signals were recorded and analyzed for percent time alpha during performance of a series of mental arithmetic tasks and also during a period of meditation. Higher scores on the Hypochondriasis scale of the MMPI were associated with increase in alpha as the subject proceeded from the mental arithmetic tasks to the meditation period. This result is discussed in terms of previous research, the pre-meditation level of alpha, and the implications for the use of meditation as a therapeutic procedure.
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Waring JL, Roth RS, Parker HS, Brower WS. Phase Equilibria and Crystal Growth in the Alkali Antimonate Systems Sb 2O 4-NaSbO 3/ Sb 2O 4-KSbO 3/, and Sb 2O 4-NaSbO 3-NaF. J Res Natl Bur Stand A Phys Chem 1976; 80A:761-774. [PMID: 32196298 PMCID: PMC5312759 DOI: 10.6028/jres.080a.070] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Phase equilibrium diagrams have been constructed from experimental data for the systems Sb2O4–NaSbO3, Sb2O4–KSbO3, and Sb2O4–NaSbO3–NaF. The system Sb2O4–NaSbO3 contains only an intermediate pyrochlore type solid solution with a maximum melting point of 1490 °C at a Na:Sb atom ratio of 3:5. The Sb2O4–KSbO3 system contains in addition to the pyrochlore phase a compound 3K2O • 5Sb2O5 which melts congruently at about 1450 °C and two polymorphs of K2O • 2Sb2O5. The low temperature form of K2O • 2Sb2O5 was found to be monoclinic P21/c with a = 7.178, b = 13.378, c = 11.985 A, β = 124°10′. The melting point of Sb2O4 was found to be 1350 ± 5 °C and NaSbO3 and KSbO3 both melt congruently at 1555 ± 5 °C and 1410 ± 5 °C respectively. The previously reported cubic form of KSbO3 was found to be a K+ deficient phase stabilized by reaction with atmospheric moisture. A similar cubic phase which appears to be a good Na+ ion conductor can be synthesized in the ternary system NaSbO3–Sb2O4–NaF.
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Affiliation(s)
- J L Waring
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - R S Roth
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - H S Parker
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - W S Brower
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
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33
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Abstract
A pressure-temperature (P-T) section of the phase equilibrium diagram for Nb2O5 has been determined. Four single phase regions, H-Nb2O5, B-Nb2O5, and two L-Nb2O5 areas, were characterized by x-ray powder diffraction data. The superstructure of L-Nb2O5 was indexed on the basis of similarities to the known superstructures of L-Ta2O5 and confirmed with single crystal electron diffraction data. The correct unit cell is orthorhombic with a = 6.168, b = 29.312, c = 3.938 Å, with the b axis 8 times the subcell (8 × 3.664 Å).
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Affiliation(s)
- J L Waring
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - R S Roth
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - H S Parker
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
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Roth RS, Waring JL. Effect of Oxide Additions on the Polymorphism of Tantalum Pentoxide: III. "Stabilization" of the Low Temperature Structure Type. J Res Natl Bur Stand A Phys Chem 1970; 74A:485-493. [PMID: 32523201 PMCID: PMC6696548 DOI: 10.6028/jres.074a.038] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
The "low temperature structure type" of Ta2O5 has been found to occur in two distinct forms with the lowest temperature form having a unit cell 14 times the subcell and an intermediate temperature form with a unit cell 11 times the subcell. The two types form intermediate partially ordered mixtures which are apparently in thermal equilibrium at various temperatures between ~ 1000 and 1350 °C. The addition of MoO3, WO3, SiO2, GeO2, ZrO2, TiO2, B2O3 and Al2O3 each affect the multiplicity of the true unit cell in different ways. WO3, SiO2, GeO2, B2O3, and Al2O3 form phases structurally similar to "low-Ta2O5" which are stable up to the solidus temperatures of the corresponding systems.
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Affiliation(s)
- R S Roth
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - J L Waring
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
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Roth RS, Waring JL, Brower WS. Effect of Oxide Additions on the Polymorphism of Tantalum Pentoxide: II. "Stabilization" of the High Temperature Structure Type. J Res Natl Bur Stand A Phys Chem 1970; 74A:477-484. [PMID: 32523200 PMCID: PMC6696549 DOI: 10.6028/jres.074a.037] [Citation(s) in RCA: 43] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
The high temperature, apparently tetragonal, polymorph of tantalum pentoxide can be obtained at room temperature by quenching a specimen containing 2-5 mole percent of the following oxides:SnO2, Ga2O3, Cr2O3, Fe2O3, Sc2O3, or MgO. All the x-ray patterns can be indexed on a body centered tetragonal cell with a ≈ 3.830 Å, c ≈ 35.68 Å. However, P2O5, V2O5, Nb2O5, ZrO2, Lu2O3, NiO, or ZnO do not stabilize the tetragonal form at room temperature. Single crystals of scandium "stabilized" Ta2O5 have been grown by the Czochralski technique.
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Affiliation(s)
- R S Roth
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - J L Waring
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - W S Brower
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
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Abstract
Sr10P6O24(OH)2, (Hex. a = 9.765 Å, c = 7.280 Å), and Ba10P6O24(OH)2, (Hex. a = 10.177 Å, c = 7.731 Å), undergo cell parameter contractions at elevated temperatures in air. These can be correlated with progressive dehydroxylation, although neither can be completely dehydrated. Pb10P6O24(OH)2, (Hex. a = 9.878 Å, c = 7.432 Å), also does not completely dehydrate in air. A new apatite-like strontium phosphate, (Hex. a = 9.872 Å, c = 7.199 Å), was prepared at elevated temperatures in vacuum.
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Affiliation(s)
- T Negas
- Institute for Basic Standards, National Bureau of Standards, Washington, D.C. 20234
| | - R S Roth
- Institute for Basic Standards, National Bureau of Standards, Washington, D.C. 20234
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Waring JL, Roth RS. Effect of Oxide Additions on the Polymorphism of Tantalum Pentoxide (System Ta 2O 5-TiO 2). J Res Natl Bur Stand A Phys Chem 1968; 72A:175-186. [PMID: 31824088 DOI: 10.6028/jres.072a.018] [Citation(s) in RCA: 84] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
The phase equilibrium relationships of the TiO2-Ta2O5 system were determined in air. An equimolar compound, TiTa2O7, was found to melt congruently at about 1662 °C and have a monoclinic unit cell a = 20.291 Å, b = 3.804 Å, c = 11.831 Å, β = 120°14', apparently isostructural with TiNb2O7. In addition, two other compounds are postulated to occur at about TiO2:49Ta2O5 and TiO2:7Ta2O5 and to dissociate at about 1230 and 1190 °C, respectively. TiO2 apparently accepts a maximum of 9 mole percent Ta2O5 in solid solution at 1630 °C. Two eutectics occur in the system at 54 mole percent Ta2O5 and 1650 °C and 31 mole percent Ta2O5 and 1630 °C. The high temperature form of Ta2O5 is apparently triclinic at room temperature with a = 3.801 Å, b = 3.785 Å, c = 35.74 Å, α = 90°54.4', β = 90°11.5', and γ = 89°59.9'. A metastable transition occurs at 320 °C to a monoclinic form which inverts to tetragonal at 920 °C with a = 3.81 Å, c = 36.09 Å. Several intermediate morphotropic phases are found with up to 9 mole percent TiO2 in solid solution.
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Affiliation(s)
- J L Waring
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - R S Roth
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
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Roth RS, Waring JL. Phase Equilibria as Related to Crystal Structure in the System Niobium Pentoxide-Tungsten Trioxide. J Res Natl Bur Stand A Phys Chem 1966; 70A:281-303. [PMID: 31823998 PMCID: PMC6696531 DOI: 10.6028/jres.070a.025] [Citation(s) in RCA: 103] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
The phase equilibrium diagram for the binary system niobium pentoxide-tungsten trioxide has been constructed from results of x-ray diffraction studies on both single crystals and powders and from fusion characteristics. Twelve stable compounds have been found in the system. The exact composition of eight of these compounds has been established by single crystal analyses at the Nb2O5:WO3 ratios of 6:1, 13:4, 7:3, 8:5, 9:8, 1:1, 4:9, and 2:7. The approximate compositions of the remaining four other phases are 30:1, 6:11, 1:11, and 1:15. The 6:1, "6:11", 4:9, and 2:7 phases melt eongruently at 1476, 1378, 1380, and 1357 °C, respectively. The "30:1", 7:3, 8:5, 9:8, "1:11", and "1:15" phases melt incongruently at 1470, 1440, 1385, 1375, 1356, and 1358 °C, respectively; and the 13:4 and 1:1 phases decompose before melting at 1435 and 1115 °C, respectively. The 8:5, 9:8, "6:11", 2:7, "1:11", and "1:15" compounds are shown on the phase diagram as having minimum temperatures of stability. One metastable phase having a narrow range of composition near the 3:8 ratio was also encountered. Although Nb2O5 apparently exhibits no solid solution, WO3 was found to accept a maximum of three mole percent niobia in solid solution enabling all the reported polymorphs of WO3 to be obtained at room temperature.
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Affiliation(s)
- R S Roth
- Institute for Materials Research, National Bureau of Standards, Washington, D.C
| | - J L Waring
- Institute for Materials Research, National Bureau of Standards, Washington, D.C
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Abstract
The phase diagram for the pseudo-binary system V2O5-Nb2O5 was constructed from fusion characteristics and x-ray diffraction data. Three compounds were postulated for the system. The compound VNb9O25 and V2Nb23O62 were found to melt incongruently at about 129O °C and 1322 °C respectively. The third compound occurring at about 93 to 94 mole percent Nb2O5 melted incongruently at approximately 1332 °C. Apparently,Nb2O5 accepted up to 5 mole percent V2O5 in solid solution, however, V2O5 did not accept any appreciable Nb2O5 in solid solution. In addition, the Nb2O5 rich portions of the following binary systems were reinvestigated: ZnO - Nb2O5, NiO - Nb2O5, A12O3 - Nb2O5, TiO2 - Nb2O5, and ZrO2 - Nb2O5. In each case an Nb2O5 solid solution had been reported previously in excess of 9O mole percent Nb2O5.However, subsequent data indicated that these Nb2O5 solid solutions contained discrete compounds which are related to those found in the pseudo-binary V2O5 - Nb2O5.
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41
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Abstract
A large portion of the phase equilibrium diagram for the binary system barium oxide-niobium pentoxide has been constructed from observations of fusion characteristics and X-ray diffraction data. In the system five binary compounds were observed with BaO: Nb2O5 ratios of 5:2, 1:1, 6:7, 3:5, and 1:3 and a 6:1 compound was postulated. The 1:1 compound was found to melt congruently at 1,455 °C and have only one stable polymorph, although a second metastable polymorph can also be prepared. The 5:2 compound melts congruently at 1,542 °C; the 6:7, 3:5, and 1:3 phases melt incongruently at 1,330, 1,290, and 1,315 °C, respectively. The phase relations of the 6:1 compound could not be determined due to the reaction between this phase and platinum metal. No 2:1 compound was observed in this system.
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Abstract
Selected mixtures in 69 binary systems involving Al2O3, Ga2O3, Cr2O3, Fe2O3, Sc2O3, In2O3, Y2O3, and the rare earth oxides were studied by X-ray diffraction techniques after heat treatment at various temperatures. A plot of the radii of the A+3 cations versus the radii of B+3 cations shows the regions of stability for the different structure types found for the double oxides of the trivalent cations. The following structure types were encountered: A, B, and C-type rare earth oxide; corundum, beta gallia; kappa alumina; garnet; perovskite; and several types which could not be definitely related to known structures. The majority of A+3B+3O3 compounds have the perovskite structure. Several phases, including (1-x)Fe2O3·xAl2O3 ss and (1-x)Fe2O3·Ga2O3 ss, appear to have structures similar to kappa alumina. Solid solution definitely occurs in many of the garnet type compounds which contain gallia. Based on the data collected in this survey, the subsolidus phase equilibria relationships of 79 binary systems were drawn.
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Roth RS, Schneider SJ. Phase Equilibria in Systems Involving the Rare-Earth Oxides. Part I. Polymorphism of the Oxides of the Trivalent Rare-Earth Ions. J Res Natl Bur Stand A Phys Chem 1960; 64A:309-316. [PMID: 32196170 PMCID: PMC5287085 DOI: 10.6028/jres.064a.030] [Citation(s) in RCA: 164] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The polymorphic relationships of the pure rare-earth oxides have been reinvestigated using X-ray diffraction methods for identification of phases. The oxides of the trivalent rare earth ions crystallize in three different types: A, B, and C. Each oxide has only one truly stable polymorph: La2O3, Ce2O3, Pr2O3, and Nd2O3 belong to the A type; Sm2O3, Eu2O3, and Gd2O3 to the B type; Tb2O3, Dy2O3, Ho2O3, Er2O3, Tm2O3, Yb2O3, and Lu2O3 to the C type. In addition Nd2O3, Sm2O3, Eu2O3, and Gd2O3 have low-temperature, apparently metastable, C-type polymorphs. The low-temperature form inverts irreversibly to the stable form at increasingly higher temperatures for decreasing cation radius.
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