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Ulmer CS, Taylor KA, Campbell AA, Sherwood A, Wu JQ, Beckham JC, Hoerle JM, Augustine AV. Response to letter to the editor: sleep breathing at the intersection of nightmares and cardiovascular risk. Sleep 2023; 46:zsad221. [PMID: 37748436 DOI: 10.1093/sleep/zsad221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2023] Open
Affiliation(s)
- Christi S Ulmer
- Durham Veterans Affairs Center of Innovation to Accelerate Discovery and Practice Transformation (ADAPT), Durham, NC, USA
- Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, NC, USA
| | - Kenneth A Taylor
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, NC, USA
- Duke University School of Medicine, Duke Clinical Research Institute, Durham, NC, USA
| | | | - Andrew Sherwood
- Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, NC, USA
| | - Jade Q Wu
- Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, NC, USA
| | - Jean C Beckham
- Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, NC, USA
- Veterans Affairs VA Mid-Atlantic MIRECC Workgroup, Durham, NC, USA
| | - Jeffrey M Hoerle
- Veterans Affairs VA Mid-Atlantic MIRECC Workgroup, Durham, NC, USA
| | - Ann V Augustine
- Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, NC, USA
- Durham Veterans Affairs (VA) Healthcare System, Durham, NC, USA
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Campbell AA, Taylor KA, Augustine AV, Sherwood A, Wu JQ, Beckham JC, Hoerle JM, Ulmer CS. Nightmares: an independent risk factor for cardiovascular disease? Sleep 2023; 46:zsad089. [PMID: 36996027 DOI: 10.1093/sleep/zsad089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 02/13/2023] [Indexed: 03/31/2023] Open
Abstract
STUDY OBJECTIVES Prior work has established associations between post-traumatic stress disorder (PTSD), disrupted sleep, and cardiovascular disease (CVD), but few studies have examined health correlates of nightmares beyond risks conferred by PTSD. This study examined associations between nightmares and CVD in military veterans. METHODS Participants were veterans (N = 3468; 77% male) serving since September 11, 2001, aged 38 years (SD = 10.4); approximately 30% were diagnosed with PTSD. Nightmare frequency and severity were assessed using the Davidson Trauma Scale (DTS). Self-reported medical issues were assessed using the National Vietnam Veterans Readjustment Study Self-report Medical Questionnaire. Mental health disorders were established using the Structured Clinical Interview for DSM-IV. The sample was stratified by the presence or absence of PTSD. Within-group associations between nightmare frequency and severity and self-reported CVD conditions, adjusting for age, sex, race, current smoking, depression, and sleep duration. RESULTS Frequent and severe nightmares during the past week were endorsed by 32% and 35% of participants, respectively. Those endorsing nightmares that were frequent, severe, and the combination thereof were more likely to also evidence high blood pressure (ORs 1.42, OR 1.56, and OR 1.47, respectively) and heart problems (OR 1.43, OR 1.48, and OR 1.59, respectively) after adjusting for PTSD diagnosis and other covariates. CONCLUSIONS Nightmare frequency and severity among veterans are associated with cardiovascular conditions, even after controlling for PTSD diagnosis. Study findings suggest that nightmares may be an independent risk factor for CVD. Additional research is needed to validate these findings using confirmed diagnoses and explore potential mechanisms.
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Affiliation(s)
| | - Kenneth A Taylor
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, NC, USA
- Duke University School of Medicine, Duke Clinical Research Institute, Durham, NC, USA
| | - Ann V Augustine
- Durham Veterans Affairs (VA) Healthcare System, Durham, NC, USA
- Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, NC, USA
| | - Andrew Sherwood
- Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, NC, USA
| | - Jade Q Wu
- Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, NC, USA
| | - Jean C Beckham
- Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, NC, USA
- Veterans Affairs VA Mid-Atlantic MIRECC Workgroup, Durham, NC, USA
| | - Jeffrey M Hoerle
- Veterans Affairs VA Mid-Atlantic MIRECC Workgroup, Durham, NC, USA
| | - Christi S Ulmer
- Durham Veterans Affairs (VA) Healthcare System, Durham, NC, USA
- Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, NC, USA
- Durham Veterans Affairs Center of Innovation to Accelerate Discovery and Practice Transformation (ADAPT), Durham, NC, USA
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Peterson C, Hicks JL, De Marzo AM, Campbell AA, Eberhart CG, Dubielzig RR, Teixeira LB. Upregulated MYC expression and p53 mutations may contribute to the oncogenesis of canine Meibomian gland carcinomas. Vet Pathol 2023; 60:185-189. [PMID: 36541627 DOI: 10.1177/03009858221143400] [Citation(s) in RCA: 0] [Impact Index Per Article: 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] [Indexed: 12/24/2022]
Abstract
Sebaceous carcinomas of the human ocular adnexa commonly exhibit pagetoid spread, mutations in tumor-suppressor genes, and protooncogene copy number gain. Sebaceous carcinomas are rarely reported in other species, and while the Meibomian gland (MG) represents the most common ocular adnexal structure of the canine eyelid to develop neoplasia, most are clinically and histologically benign. The objective of this study was to compare molecular features of canine MG carcinomas and adenomas. Two retrospectively identified MG carcinomas were subject to immunohistochemistry and qPCR. When compared with normal glands, MYC was upregulated in benign and malignant MG neoplasms. Aberrant p53 expression was restricted to the nuclei of intraepithelial neoplastic cells in MG carcinomas. Adipophilin expression was diminished in MG neoplasms compared with the normal MG. Our findings, if confirmed in a larger cohort of cases, could suggest that MG oncogenesis in a dog may exhibit similar molecular features as their human counterparts.
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Affiliation(s)
| | - J L Hicks
- Johns Hopkins University School of Medicine, Baltimore, MD
| | - A M De Marzo
- Johns Hopkins University School of Medicine, Baltimore, MD
| | - A A Campbell
- Johns Hopkins University School of Medicine, Baltimore, MD
| | - C G Eberhart
- Johns Hopkins University School of Medicine, Baltimore, MD
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Wisco BE, Vrshek-Schallhorn S, May CL, Campbell AA, Nomamiukor FO, Pugach CP. Effects of trauma-focused rumination among trauma-exposed individuals with and without posttraumatic stress disorder: An experiment. J Trauma Stress 2023; 36:285-298. [PMID: 36655347 DOI: 10.1002/jts.22905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 10/19/2022] [Accepted: 11/16/2022] [Indexed: 01/20/2023]
Abstract
Rumination, or thinking repetitively about one's distress, is a risk factor for posttraumatic stress disorder (PTSD). Current theories suggest that rumination contributes to PTSD symptoms directly, by increasing negative reactions to trauma cues (i.e., symptom exacerbation), or represents a form of cognitive avoidance, if verbal ruminations are less distressing than trauma imagery. The goal of this study was to test the symptom exacerbation and cognitive avoidance accounts of trauma-focused rumination. We recruited 135 trauma-exposed participants (n = 60 diagnosed with PTSD) and randomly assigned them to ruminate about their trauma, distract themselves, or engage in trauma imagery. For individuals with and without PTSD, rumination led to larger increases in subjective distress (i.e., negative affect, fear, sadness, subjective arousal, valence) than distraction, ηp 2 s = .04-.13, but there were no differences between rumination and imagery ηp 2 s = .001-.02. We found no evidence that rumination or imagery elicited physiological arousal, ds = 0.01-0.19, but did find that distraction reduced general physiological arousal, as measured by heart rate, relative to baseline, d = 0.84, which may be due to increases in parasympathetic nervous system activity (i.e., respiratory sinus arrhythmia), d = 0.33. These findings offer no support for the avoidant function of rumination in PTSD. Instead, the findings were consistent with symptom exacerbation, indicating that rumination leads directly to emotional reactivity to trauma reminders and may be a fruitful target in PTSD intervention.
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Affiliation(s)
- Blair E Wisco
- Department of Psychology, University of North Carolina at Greensboro, Greensboro, North Carolina, USA
| | - Suzanne Vrshek-Schallhorn
- Department of Psychology, University of North Carolina at Greensboro, Greensboro, North Carolina, USA
| | - Casey L May
- Department of Psychology, University of North Carolina at Greensboro, Greensboro, North Carolina, USA
| | - Allison A Campbell
- Department of Psychology, University of North Carolina at Greensboro, Greensboro, North Carolina, USA
| | - Faith O Nomamiukor
- Department of Psychology, University of North Carolina at Greensboro, Greensboro, North Carolina, USA
| | - Cameron P Pugach
- Department of Psychology, University of North Carolina at Greensboro, Greensboro, North Carolina, USA
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Campbell AA, Wisco BE. Respiratory sinus arrhythmia reactivity in anxiety and posttraumatic stress disorder: A review of literature. Clin Psychol Rev 2021; 87:102034. [PMID: 33930767 DOI: 10.1016/j.cpr.2021.102034] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 02/24/2021] [Accepted: 04/14/2021] [Indexed: 12/24/2022]
Abstract
Respiratory sinus arrhythmia (RSA) reactivity is thought to indicate how adaptively one responds to stress. RSA reactivity has been examined across anxiety disorders and posttraumatic stress disorder (PTSD), to better understand the psychophysiological stress response of these disorders. The current state of the literature is mixed, and the association between RSA reactivity and PTSD/anxiety is unclear. This review examines RSA reactivity in response to laboratory stressor tasks across samples with anxiety and PTSD. Results indicated a complex literature that may suggest an association between anxiety/PTSD and RSA reactivity. There is evidence to suggest a pattern of heightened RSA withdrawal in PTSD and trait anxious samples. There was little evidence to suggest a heightened RSA withdrawal pattern in other anxiety disorders. This review also highlights methodological considerations which may allow for clearer interpretations of RSA reactivity. The current literature includes heterogeneity across stressor tasks, RSA measures, and comorbidities that complicates interpretation of results. Studies using samples with comorbid depression produce more consistent evidence of heightened RSA withdrawal in anxiety/PTSD. Future directions for understanding the contribution of these variables (i.e., stressor tasks, RSA measures, comorbid depression) and mechanisms contributing to the possible association between RSA reactivity and anxiety/PTSD are considered.
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Affiliation(s)
- Allison A Campbell
- Department of Psychology, University of North Carolina at Greensboro, United States of America.
| | - Blair E Wisco
- Department of Psychology, University of North Carolina at Greensboro, United States of America
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Pugach CP, Campbell AA, Wisco BE. Emotion regulation in posttraumatic stress disorder (PTSD): Rumination accounts for the association between emotion regulation difficulties and PTSD severity. J Clin Psychol 2019; 76:508-525. [DOI: 10.1002/jclp.22879] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Cameron P. Pugach
- Department of PsychologyUniversity of North Carolina at Greensboro Greensboro North Carolina
| | - Allison A. Campbell
- Department of PsychologyUniversity of North Carolina at Greensboro Greensboro North Carolina
| | - Blair E. Wisco
- Department of PsychologyUniversity of North Carolina at Greensboro Greensboro North Carolina
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Campbell AA, Wisco BE, Silvia PJ, Gay NG. Resting respiratory sinus arrhythmia and posttraumatic stress disorder: A meta-analysis. Biol Psychol 2019; 144:125-135. [DOI: 10.1016/j.biopsycho.2019.02.005] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 02/10/2019] [Accepted: 02/10/2019] [Indexed: 12/31/2022]
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Campbell AA, Wisco BE, Marx BP, Pietrzak RH. Association between perceptions of military service and mental health problems in a nationally representative sample of United States military veterans. ACTA ACUST UNITED AC 2018; 10:482-489. [DOI: 10.1037/tra0000337] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Bui E, Anderson E, Goetter EM, Campbell AA, Fischer LE, Barrett LF, Simon NM. Heightened sensitivity to emotional expressions in generalised anxiety disorder, compared to social anxiety disorder, and controls. Cogn Emot 2015; 31:119-126. [PMID: 26395075 DOI: 10.1080/02699931.2015.1087973] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [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: 10/23/2022]
Abstract
Few studies have examined potential differences between social anxiety disorder (SAD) and generalised anxiety disorder (GAD) in the sensitivity to detect emotional expressions. The present study aims to compare the detection of emotional expressions in SAD and GAD. Participants with a primary diagnosis of GAD (n = 46), SAD (n = 70), and controls (n = 118) completed a morph movies task. The task presented faces expressing increasing degrees of emotional intensity, slowly changing from a neutral to a full-intensity happy, sad, or angry expressions. Participants used a slide bar to view the movie frames from left to right, and to stop at the first frame where they perceived an emotion. The frame selected thus indicated the intensity of emotion required to identify the facial expression. Participants with GAD detected the onset of facial emotions at lower intensity of emotion than participants with SAD (p = 0.002) and controls (p = 0.039). In a multiple regression analysis controlling for age, race, and depressive symptom severity, lower frame at which the emotion was detected was independently associated and GAD diagnosis (B = -5.73, SE = 1.74, p < 0.01). Our findings suggest that individuals with GAD exhibit enhanced detection of facial emotions compared to those with SAD or controls.
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Affiliation(s)
- Eric Bui
- a Massachusetts General Hospital , Boston , MA , USA.,b Harvard Medical School , Boston , MA , USA
| | - Eric Anderson
- c Department of Psychology , Northeastern University , Boston , MA , USA
| | - Elizabeth M Goetter
- a Massachusetts General Hospital , Boston , MA , USA.,b Harvard Medical School , Boston , MA , USA
| | | | | | - Lisa Feldman Barrett
- a Massachusetts General Hospital , Boston , MA , USA.,c Department of Psychology , Northeastern University , Boston , MA , USA
| | - Naomi M Simon
- a Massachusetts General Hospital , Boston , MA , USA.,b Harvard Medical School , Boston , MA , USA
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Campbell AA, Akhter N, Sun K, De Pee S, Kraemer K, Moench-Pfanner R, Rah JH, Badham J, Bloem MW, Semba RD. Relationship of household food insecurity to anaemia in children aged 6-59 months among families in rural Indonesia. ACTA ACUST UNITED AC 2012; 31:321-30. [PMID: 22041466 DOI: 10.1179/1465328111y.0000000038] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
BACKGROUND Anaemia is a significant global public health problem in developing countries with adverse health effects on young children. Household food insecurity, which reflects a household's access, availability and utilisation of food, has not been well characterised in relation to anaemia in children. OBJECTIVE To examine the relationship of household food insecurity with anaemia (Hb <11 g/dl) in children. METHODS In a cross-sectional study of 4940 rural households participating in the Indonesian Nutrition Surveillance System, household food insecurity was measured using a modified 9-item food security questionnaire and related to anaemia in children aged 6-59 months. RESULTS The proportion of households with an anaemic child was 56·6%. In households with and without anaemic children, the mean (SD) food insecurity score was 1·82 (1·72) vs 1·55 (1·54) (p<0·0001), respectively. In a multivariate logistic regression model, food insecurity score was related to anaemia in children (odds ratio 0·77, 95% confidence interval 0·63-0·95, p=0·01) when the highest quintile of food insecurity score was compared with the lowest quintile, adjusting for potential confounders. CONCLUSION A higher household food insecurity score is associated with greater prevalence of anaemia in children in rural families in Indonesia.
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Affiliation(s)
- A A Campbell
- Department of Ophthalmology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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Rah JH, Akhter N, Semba RD, Pee SD, Bloem MW, Campbell AA, Moench-Pfanner R, Sun K, Badham J, Kraemer K. Low dietary diversity is a predictor of child stunting in rural Bangladesh. Eur J Clin Nutr 2010; 64:1393-8. [DOI: 10.1038/ejcn.2010.171] [Citation(s) in RCA: 183] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Bunker BC, Rieke PC, Tarasevich BJ, Campbell AA, Fryxell GE, Graff GL, Song L, Liu J, Virden JW, McVay GL. Ceramic thin-film formation on functionalized interfaces through biomimetic processing. Science 2010; 264:48-55. [PMID: 17778133 DOI: 10.1126/science.264.5155.48] [Citation(s) in RCA: 222] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Processing routes have been developed for the production of thin ceramic films through precipitation from aqueous solutions. The techniques are based on crystal nucleation and growth onto functionalized interfaces. Surface functionalization routes have been developed by the mimicking of schemes used by organisms to produce complex ceramic composites such as teeth, bones, and shells. High-quality, dense polycrystalline films of oxides, hydroxides, and sulfides have now been prepared from "biomimetic" synthesis techniques. Ceramic films can be synthesized on plastics and other materials at temperatures below 100 degrees C. As a low-temperature process in which water rather than organic solvents is used, this synthesis is environmentally benign. Nanocrystalline ceramics can be produced, sometimes with preferred crystallite orientation. The direct deposition of high-resolution patterned films has also been demonstrated. The process is well suited to the production of organic-inorganic composites.
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Abstract
The organic matrix in forming enamel consists largely of the amelogenin protein self-assembled into nanospheres that are necessary to guide the formation of the unusually long and highly ordered hydroxyapatite (HAP) crystallites that constitute enamel. Despite its ability to direct crystal growth, the interaction of the amelogenin protein with HAP is unknown. However, the demonstration of growth restricted to the c-axis suggests a specific protein-crystal interaction, and the charged COOH terminus is often implicated in this function. To elucidate whether the COOH terminus is important in the binding and orientation of amelogenin onto HAP, we have used solid state NMR to determine the orientation of the COOH terminus of an amelogenin splice variant, LRAP (leucine-rich amelogenin protein), which contains the charged COOH terminus of the full protein, on the HAP surface. These experiments demonstrate that the methyl 13C-labeled side chain of Ala46 is 8.0 A from the HAP surface under hydrated conditions, for the protein with and without phosphorylation. The experimental results provide direct evidence orienting the charged COOH-terminal region of the amelogenin protein on the HAP surface, optimized to exert control on developing enamel crystals.
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Affiliation(s)
- Wendy J Shaw
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
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Franklin ST, Amaral-Phillips DM, Jackson JA, Campbell AA. Health and performance of Holstein calves that suckled or were hand-fed colostrum and were fed one of three physical forms of starter. J Dairy Sci 2003; 86:2145-53. [PMID: 12836951 PMCID: PMC7095194 DOI: 10.3168/jds.s0022-0302(03)73804-1] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Intake of colostrum by neonatal calves and early transition to calf starter are two important factors in successful calf programs. Thirty-one Holstein calves were used to determine health and performance of calves that were 1) allowed to remain with their dams for 3 d and suckle (suckled calves) or were removed from their dams and fed colostrum only by bottle (bottle calves); and were 2) fed ground, pelleted, or textured starters, formulated to be isonitrogenous. Bottle calves were removed from their dams at birth, fed 2.84 L of colostrum, placed in individual hutches, and fed 1.89 L of colostrum 12 h after the first feeding. Suckled calves were removed from their dams after 3 d and placed in individual hutches. Once calves were housed in hutches, they were fed 2 L of whole milk twice daily and were provided starters and water beginning on d 3. Calves were weighed at birth and weekly for 6 wk. Blood samples were obtained at birth, 24 h, and weekly for serum protein determination. Starter intake, fecal scores, and electrolyte treatments were recorded daily. Weaning began when calves had consumed 0.68 kg starter for 2 d consecutively. There were no differences in treatment means between suckled and bottle calves for total gain, grain consumption, days with fecal scores >2, or electrolyte treatments per calf. Average days to weaning was greater for bottle calves compared with suckled calves. Mean serum protein concentration at 24 h was greater for bottle (6.0 g/dl) compared with suckled calves (5.8 g/dl) and only 2 of 15 bottle calves had serum protein concentrations <5.0 g/dl compared with 6 of 16 suckled calves. For starter treatments, calves fed textured starter consumed more total grain, were weaned earlier, and weighed more at 6 wk of age than calves fed pelleted starter. Based on 24-h serum protein concentrations, transfer of passive immunity was greater for bottle calves compared with suckled calves.
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Affiliation(s)
- S T Franklin
- Animal Sciences Department, University of Kentucky, Lexington 40546-0215, USA.
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DeJong ES, DeBerardino TM, Brooks DE, Nelson BJ, Campbell AA, Bottoni CR, Pusateri AE, Walton RS, Guymon CH, McManus AT. Antimicrobial efficacy of external fixator pins coated with a lipid stabilized hydroxyapatite/chlorhexidine complex to prevent pin tract infection in a goat model. J Trauma 2001; 50:1008-14. [PMID: 11426113 DOI: 10.1097/00005373-200106000-00006] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND Pin tract infection is a common complication of external fixation. An antiinfective external fixator pin might help to reduce the incidence of pin tract infection and improve pin fixation. METHODS Stainless steel and titanium external fixator pins, with and without a lipid stabilized hydroxyapatite/chlorhexidine coating, were evaluated in a goat model. Two pins contaminated with an identifiable Staphylococcus aureus strain were inserted into each tibia of 12 goats. The pin sites were examined daily. On day 14, the animals were killed, and the pin tips cultured. Insertion and extraction torques were measured. RESULTS Infection developed in 100% of uncoated pins, whereas coated pins demonstrated 4.2% infected, 12.5% colonized, and the remainder, 83.3%, had no growth (p < 0.01). Pin coating decreased the percent loss of fixation torque over uncoated pins (p = 0.04). CONCLUSION These results demonstrate that the lipid stabilized hydroxyapatite/chlorhexidine coating was successful in decreasing infection and improving fixation of external fixator pins.
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Affiliation(s)
- E S DeJong
- Extremity Trauma Study Branch, U.S. Army Institute of Surgical Research, Brooke Army Medical Center, Fort Sam Houston, Texas 78234-6200, USA
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Campbell AA, Song L, Li XS, Nelson BJ, Bottoni C, Brooks DE, DeJong ES. Development, characterization, and anti-microbial efficacy of hydroxyapatite-chlorhexidine coatings produced by surface-induced mineralization. J Biomed Mater Res 2000; 53:400-7. [PMID: 10898881 DOI: 10.1002/1097-4636(2000)53:4<400::aid-jbm14>3.0.co;2-z] [Citation(s) in RCA: 113] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The surface-induced mineralization (SIM) technique was used to produce hydroxyapatite (HAP) coatings on external fixation pins with the antimicrobial agent, chlorhexidine, incorporated within the coating. The SIM process involved surface modification of the substrate with organic functional groups followed by immersion in aqueous supersaturated calcium phosphate solutions. X-ray diffraction spectra confirmed that hydroxyapatite coatings were formed. Chlorhexidine was incorporated into the coating by placing the substrate into various chlorhexidine solutions in between mineralization cycles. Total uptake was measured by dissolution of the coating into a 0.1 M nitric acid solution and measuring the chlorhexidine concentration using UV spectroscopy at 251 nm. Release rates were measured by submersion of coated substrates into saline solutions and measuring chlorhexidine UV absorbency at 231 nm as a function of time. Results show an initial rapid release followed by a period of slower sustained release. The anti-microbial efficacy of the HAP-chlorhexidine coatings was evaluated in vitro using a Staphylococcus aureus cell culture. Initial results show a large "inhibition zone" formed around the chlorhexidine/HAP coating vs. coatings with HAP only. This preliminary work clearly demonstrates that SIM HAP coatings have great potential to locally deliver antimicrobial agents such as chlorhexidine at implantation sites, which may greatly reduce the incidence of pin tract infection that occurs in external fixation.
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Affiliation(s)
- A A Campbell
- Material Sciences Department, Battelle, Northwest Division, Richland, WA 99352, USA.
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Abstract
OBJECTIVES This article reviews the history of the measurement of unwanted and unintended pregnancy in fertility surveys in the United States. These concepts were developed in order to help explain trends and differences in birth rates in the United States. BACKGROUND Unwanted fertility was first measured systematically in a survey in Indianapolis in 1941. The first national surveys to measure the concept of unwanted fertility were the 1955 and 1960 Growth of American Families Studies. All three of these surveys were limited to married women. In the 1965 National Fertility Survey, the concept of mistimed births was introduced. The 1973, 1976, 1982, and 1988 National Survey of Family Growth (NSFG) continued to measure trends in unwanted and mistimed fertility, while expanding the population interviewed, from currently married to all marital statuses. The 1993 and 2001 NSFGs have enriched the data on wantedness with new measures of ambivalence and the strength of feelings about having children. CONCLUSION Measures of unwanted fertility, while imperfect, have been useful and will continue to be improved in the future.
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Affiliation(s)
- A A Campbell
- Center for Population Research, National Institute of Child Health and Human Development, National Institutes of Health, USA.
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Shaw WJ, Long JR, Campbell AA, Stayton PS, Drobny GP. A Solid State NMR Study of Dynamics in a Hydrated Salivary Peptide Adsorbed to Hydroxyapatite. J Am Chem Soc 2000. [DOI: 10.1021/ja000878q] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wendy J. Shaw
- Department of Bioengineering Department of Chemistry University of Washington, Seattle, Washington 98195 Pacific Northwest National Laboratory Richland, Washington 99352
| | - Joanna R. Long
- Department of Bioengineering Department of Chemistry University of Washington, Seattle, Washington 98195 Pacific Northwest National Laboratory Richland, Washington 99352
| | - Allison A. Campbell
- Department of Bioengineering Department of Chemistry University of Washington, Seattle, Washington 98195 Pacific Northwest National Laboratory Richland, Washington 99352
| | - Patrick S. Stayton
- Department of Bioengineering Department of Chemistry University of Washington, Seattle, Washington 98195 Pacific Northwest National Laboratory Richland, Washington 99352
| | - Gary P. Drobny
- Department of Bioengineering Department of Chemistry University of Washington, Seattle, Washington 98195 Pacific Northwest National Laboratory Richland, Washington 99352
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Shaw WJ, Long JR, Dindot JL, Campbell AA, Stayton PS, Drobny GP. Determination of Statherin N-Terminal Peptide Conformation on Hydroxyapatite Crystals. J Am Chem Soc 2000. [DOI: 10.1021/ja9842823] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Wendy J. Shaw
- Contribution from the Department of Bioengineering and Department of Chemistry, University of Washington, Seattle, Washington 98195, and Pacific Northwest National Laboratory, Richland, Washington 99352
| | - Joanna R. Long
- Contribution from the Department of Bioengineering and Department of Chemistry, University of Washington, Seattle, Washington 98195, and Pacific Northwest National Laboratory, Richland, Washington 99352
| | - John L. Dindot
- Contribution from the Department of Bioengineering and Department of Chemistry, University of Washington, Seattle, Washington 98195, and Pacific Northwest National Laboratory, Richland, Washington 99352
| | - Allison A. Campbell
- Contribution from the Department of Bioengineering and Department of Chemistry, University of Washington, Seattle, Washington 98195, and Pacific Northwest National Laboratory, Richland, Washington 99352
| | - Patrick S. Stayton
- Contribution from the Department of Bioengineering and Department of Chemistry, University of Washington, Seattle, Washington 98195, and Pacific Northwest National Laboratory, Richland, Washington 99352
| | - Gary P. Drobny
- Contribution from the Department of Bioengineering and Department of Chemistry, University of Washington, Seattle, Washington 98195, and Pacific Northwest National Laboratory, Richland, Washington 99352
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20
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Clark RH, Campbell AA, Klumb LA, Long CJ, Stayton PS. Protein electrostatic surface distribution can determine whether calcium oxalate crystal growth is promoted or inhibited. Calcif Tissue Int 1999; 64:516-21. [PMID: 10341024 DOI: 10.1007/s002239900642] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Acidic proteins found in mineralized tissues act as nature's crystal engineers, where they play a key role in promoting or inhibiting the growth of minerals such as hydroxyapatite and calcium oxalate. Despite their importance in such fundamental physiological processes as bone and tooth formation, however, there is remarkably little known of the protein structure-function relationships that govern crystal recognition. We have taken a model system approach to elucidate some of the relationships between protein surface chemistry and secondary crystal growth of biological minerals. We show here that the distribution of electrostatic surface charge on our model protein, Protein G, determined whether the secondary growth of calcium oxalate, the principal mineral phase of kidney stones, was promoted or inhibited when the proteins were preadsorbed at low and equivalent surface coverages of <10%. The native Protein G, which contains 10 surface carboxylates, increased the rate of calcium oxalate growth from aqueous solution under constant composition conditions up to 97%, whereas a site-directed mutant with six of the surface charges removed inhibited the growth rate by 60%. The adsorption isotherms of both proteins were determined and suggested that the differences in electrostatic surface properties also lead to differences in protein orientation on the crystal surface. These results demonstrate that differences in electrostatic surface potential of proteins can directly determine whether secondary calcium oxalate growth is promoted or inhibited, and a model is proposed that suggests the distribution of carboxylate residues determines the interrelated binding orientation and exposed surface chemistry of the adsorbed Protein G.
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Affiliation(s)
- R H Clark
- Department of Bioengineering, Box 352125, University of Washington, Seattle, Washington 98195 USA
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21
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Long JR, Dindot JL, Zebroski H, Kiihne S, Clark RH, Campbell AA, Stayton PS, Drobny GP. A peptide that inhibits hydroxyapatite growth is in an extended conformation on the crystal surface. Proc Natl Acad Sci U S A 1998; 95:12083-7. [PMID: 9770443 PMCID: PMC22788 DOI: 10.1073/pnas.95.21.12083] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.9] [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: 11/18/2022] Open
Abstract
Proteins play an important role in the biological mechanisms controlling hard tissue development, but the details of molecular recognition at inorganic crystal interfaces remain poorly characterized. We have applied a recently developed homonuclear dipolar recoupling solid-state NMR technique, dipolar recoupling with a windowless sequence (DRAWS), to directly probe the conformation of an acidic peptide adsorbed to hydroxyapatite (HAP) crystals. The phosphorylated hexapeptide, DpSpSEEK (N6, where pS denotes phosphorylated serine), was derived from the N terminus of the salivary protein statherin. Constant-composition kinetic characterization demonstrated that, like the native statherin, this peptide inhibits the growth of HAP seed crystals when preadsorbed to the crystal surface. The DRAWS technique was used to measure the internuclear distance between two 13C labels at the carbonyl positions of the adjacent phosphoserine residues. Dipolar dephasing measured at short mixing times yielded a mean separation distance of 3.2 +/- 0.1 A. Data obtained by using longer mixing times suggest a broad distribution of conformations about this average distance. Using a more complex model with discrete alpha-helical and extended conformations did not yield a better fit to the data and was not consistent with chemical shift analysis. These results suggest that the peptide is predominantly in an extended conformation rather than an alpha-helical state on the HAP surface. Solid-state NMR approaches can thus be used to determine directly the conformation of biologically relevant peptides on HAP surfaces. A better understanding of peptide and protein conformation on biomineral surfaces may provide design principles useful for the modification of orthopedic and dental implants with coatings and biological growth factors that are designed to enhance biocompatibility with surrounding tissue.
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Affiliation(s)
- J R Long
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
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22
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Letellier SR, Lochhead MJ, Campbell AA, Vogel V. Oriented growth of calcium oxalate monohydrate crystals beneath phospholipid monolayers. Biochim Biophys Acta 1998; 1380:31-45. [PMID: 9545525 DOI: 10.1016/s0304-4165(97)00121-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Oriented calcium oxalate crystals have been grown beneath phospholipid monolayers at the air-solution interface from supersaturated calcium oxalate solutions. Mature calcium oxalate crystals grown beneath zwitterionic dipalmitoylphosphatidylcholine (DPPC) monolayers exhibit the characteristic morphology of calcium oxalate monohydrate (COM) crystals with the elongated (101) crystal face preferentially oriented parallel to the plane of the monolayer. Calcium oxalate crystals grown beneath negatively-charged dimyristoylphosphatidylserine (DMPS) monolayers also show a preferential orientation with respect to the monolayer; they do not, however, exhibit the characteristic COM morphology. Raman spectroscopy strongly suggests that the crystals grown beneath either DPPC or DMPS monolayers are the monohydrate phase of calcium oxalate; therefore, differences in crystal morphology are not due to differences in the crystalline phase. Dimyristoylphosphatidylethanolamine (DMPE), dimyristoylphosphatidic acid (DMPA), eicosanoic acid (C20), and eicosanol (C20-OH) monolayers have also been studied to help elucidate the mechanisms of interaction between the lipid monolayers and the calcium oxalate crystals. We discuss the roles of lattice matching, hydrogen bonding, stereochemistry and electrostatics on crystal orientation and morphology.
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Affiliation(s)
- S R Letellier
- Department of Bioengineering, University of Washington, Seattle, USA
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23
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Wheeler DL, Campbell AA, Graff GL, Miller GJ. Histological and biomechanical evaluation of calcium phosphate coatings applied through surface-induced mineralization to porous titanium implants. J Biomed Mater Res 1997; 34:539-43. [PMID: 9054537 DOI: 10.1002/(sici)1097-4636(19970315)34:4<539::aid-jbm14>3.0.co;2-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The purpose of this pilot study was to evaluate surface-induced mineralization (SIM) as a potential technique to apply ceramic coatings to metal orthopaedic implants. Cylindrical titanium porous-coated implants were either coated by SIM or plasma-spray (PLS) techniques with calcium phosphate, or left uncoated (CTL). The implants were bilaterally implanted into the intramedullary canal of the proximal femur of 24 adult New Zealand white rabbits segregated into the following groups: PLS/CTL, SIM/CTL, and SIM/PLS. After 6 weeks in vivo, biomechanical and histologic evaluations were completed. Biomechanically, SIM had consistently greater mechanical interlock than PLS implants. However, CTL implants had greater mechanical interlock than both PLS and SIM. The small sample size prevented statistical evaluation and definitive biomechanical conclusions. Histologically, SIM and PLS had significantly greater ingrowth than CTL implants (p < 0.05). The SIM coating technique produced similar ingrowth characteristics as standard PLS coatings, yet may prevent osteolysis by providing a stronger, more reliable, covalent bond between the ceramic and metal.
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Affiliation(s)
- D L Wheeler
- Division of Orthopaedics, Oregon Health Sciences University, Portland 97201, USA
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24
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Abstract
Calcium phosphate coatings were nucleated and grown from aqueous solution onto titanium metal substrates via surface-induced mineralization (SIM) processing techniques. This process is based on the observation that in nature organisms use biopolymers to produce ceramic composites, such as teeth, bones, and shells. The SIM process involves modification of a surface to introduce surface functionalization followed by immersion in aqueous supersaturated calcium phosphate solutions. This low-temperature process (< 100 degrees C) has advantages over conventional methods of calcium phosphate deposition in that uniform coatings are produced onto complex-shaped and/or microporous samples. Additionally, because it is a low-temperature process, control of the phase and crystallinity of the deposited material can be maintained.
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Affiliation(s)
- A A Campbell
- Material and Chemical Sciences Department, Pacific Northwest National Laboratory, Richland, Washington 99352, USA
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25
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Dolan MC, Campbell AA. The Criminal Procedure (Insanity and Unfitness to Plead) Act, 1991. A case report and selected review of the legal reforms. Med Sci Law 1994; 34:155-160. [PMID: 8028491 DOI: 10.1177/002580249403400211] [Citation(s) in RCA: 2] [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] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Procedures relating to Insanity and Fitness to Plead are reviewed with special emphasis on the problems encountered with previous legislation. The introduction of the new Criminal Procedure (Insanity and Unfitness to Plead) Act 1991, on 1 January 1992, offered greater discretion in the disposal of these defendants, but fell short of many of the recommendations made by those advocating reform. As yet, too few cases have passed through the courts to highlight particular deficiencies in the unreformed parts of the Act, but the benefits are already apparent. Finally, some of the potential pitfalls of supervision and treatment orders and other disposals are discussed and an insanity case, dealt with under the new legislation, is presented.
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Affiliation(s)
- M C Dolan
- Ashworth Hospital, Maghull, Merseyside
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26
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Campbell AA, Fryxell GE, Graff GL, Rieke PC, Tarasevich BJ. The nucleation and growth of calcium oxalate monohydrate on self-assembled monolayers (SAMS). Scanning Microsc 1993; 7:423-9. [PMID: 8316812] [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: 01/29/2023]
Abstract
A physical chemical approach was used to study calcium oxalate monohydrate (COM) nucleation and growth on various organic interfaces. Self-assembling monolayers (SAMs), containing derivatized organic functional groups, were designed to mimic various amino acid residues present in both urine and stone matrix macromolecules. Derivatized surfaces include SAMs with terminal methyl, bromo, imidazole, and thiazolidine-carboxylic acid functional groups. Pronounced differences in COM deposition were observed for the various interfaces with the imidazole and thiazolidine surfaces having the greatest effect and the methyl and bromo groups having little or no nucleating potential.
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Affiliation(s)
- A A Campbell
- Materials Sciences Department, Battelle Pacific Northwest Laboratory, Richland, WA 99352
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27
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Mestery K, Campbell AA. Outbreak of penicillin- and tetracycline-resistant Neisseria gonorrhoeae in Manitoba in 1991. Can Commun Dis Rep 1992; 18:162-6. [PMID: 1291008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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28
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Nancollas GH, Smesko SA, Campbell AA, Richardson CF, Johnsson M, Iadiccico RA, Binette JP, Binette M. Physical chemical studies of calcium oxalate crystallization. Am J Kidney Dis 1991; 17:392-5. [PMID: 2008905 DOI: 10.1016/s0272-6386(12)80629-9] [Citation(s) in RCA: 14] [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: 12/29/2022]
Abstract
The physical chemical approach to the investigation of the calcium oxalate (CaOx) crystallization and urolith formation is the systematic examination of the various aspects of mineral precipitation and growth in pure solution, in the presence of individual urinary components, and in whole urine media. Recent experimental studies have indicated that while small urinary ions such as citrate, magnesium, and phosphocitrate retard the mineralization rate of CaOx, urinary macromolecules may act either as inhibitors of growth or promoters of nucleation. Some CaOx mineralization inhibitors have also been found to influence the growth mechanism of the phase and its flocculation properties. Therefore, urinary macromolecules that are adsorbed on the mineralizing crystals and incorporated into the developing stone may play a significant role in urolithiasis.
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Affiliation(s)
- G H Nancollas
- Chemistry Department, State University of New York, Buffalo 14214
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29
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Campbell AA, Ebrahimpour A, Perez L, Smesko SA, Nancollas GH. The dual role of polyelectrolytes and proteins as mineralization promoters and inhibitors of calcium oxalate monohydrate. Calcif Tissue Int 1989; 45:122-8. [PMID: 2476205 DOI: 10.1007/bf02561411] [Citation(s) in RCA: 83] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Polyelectrolytes and protein molecules appear to be able to act not only as crystallization inhibitors when present in solution, but also as promoters of crystal growth when immobilized onto surfaces. Because this is especially relevant for systems in which heterogeneous nucleation can occur, the influence of poly-L-glutamic (PGlu) acid, poly-L-aspartic (PAsp) acid, and human serum albumin (HSA) on the nucleation and growth inhibition of calcium oxalate monohydrate (COM) was studied using the Constant Composition (CC) kinetics technique. The overgrowth of COM on hydroxyapatite (HAP) seed crystals pretreated with HSA was also investigated. Pronounced differences in inhibiting and nucleating potential were found for the various additives. HSA, a relatively poor growth inhibitor when present in solution, was found to nucleate very regular, hexagonal COM crystals when immobilized on a surface and to enhance the overgrowth of COM when adsorbed on HAP surfaces.
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Affiliation(s)
- A A Campbell
- Department of Chemistry, State University of New York, Buffalo 14214
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31
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Campbell AA. Preventive activity. Can Fam Physician 1984; 30:753-755. [PMID: 21279030 PMCID: PMC2154070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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Abstract
The processes of fertility change in the United States are structured in a way that exaggerates the upward and downward trends in annual measures of fertility, relative to underlying trends in the average number of children that women have during their reproductive years of life. In the 1950s, we witnessed a period of relatively inflated fertility; in the 1970s we are apparently going through a period of relatively depressed fertility. The childbearing expectations of young women suggest that annual fertility rates will rise in the near future, but do not provide any reason to believe that there will be a substantial increase in fertility comparable to that occurring between the 1930s and the 1950s. The causes of swings in fertility rates are not yet fully known, but some promising hypotheses have been proposed and are being tested.
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33
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Quick AD, Campbell AA. A model for preschool curriculum: project MEMPHIS. Ment Retard 1977; 15:42-6. [PMID: 853947] [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: 12/24/2022]
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34
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Campbell AA. Note on "factors in the incidence of childlessness in Canada: an analysis of census data," by J. E. Veevers. Soc Biol 1973; 20:350. [PMID: 4797080 DOI: 10.1080/19485565.1973.9988064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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35
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Campbell AA. Population: the search for solutions in the behavioral sciences. Am J Obstet Gynecol 1973; 116:131-52. [PMID: 4697165 DOI: 10.1016/0002-9378(73)90898-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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36
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Campbell AA, Berelson B. Contraceptive specifications: report on a workshop. Stud Fam Plann 1971; 2:14-9. [PMID: 5113342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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37
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Campbell AA, Clague A, Godley F. Natality statistics analysis, 1964. Vital Health Stat 21 1967:1-38. [PMID: 5298821] [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: 01/14/2023]
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38
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Sauvage LR, Wood SJ, Berger KE, Campbell AA. Autologous pericardium for mitral leaflet advancement. Findings in the human after 56 months. J Thorac Cardiovasc Surg 1966; 52:849-54. [PMID: 5923722] [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: 01/17/2023]
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39
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Campbell AA. The day the bridge fell down. Can Nurse 1966; 62:33-5. [PMID: 5921906] [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: 01/17/2023]
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40
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Campbell AA, Clague A, Godley F, Rosenberg HM. Natality statistics analysis. Vital Health Stat 21 1966:1-29. [PMID: 5295503] [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: 01/14/2023]
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41
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Campbell AA. Menière's Disease : (With Some Observations on its Treatment by Histamine). Can Med Assoc J 1945; 52:605-606. [PMID: 20323464 PMCID: PMC1582266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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43
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Campbell AA. Canalization of Complete OEsophageal Stricture : Report of Case. Can Med Assoc J 1945; 52:471-474. [PMID: 20323430 PMCID: PMC1581960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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44
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Campbell AA. Cancer of the Larynx : With Observations on 103 Cases. Can Med Assoc J 1943; 49:509-512. [PMID: 20322947 PMCID: PMC1827995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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45
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Campbell AA. Osteomyelitis of the Frontal Bone : (With Observations on Seventeen Cases). Can Med Assoc J 1942; 47:226-229. [PMID: 20322544 PMCID: PMC1827607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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46
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Campbell AA. Ear Injuries. Can Med Assoc J 1941; 45:152-155. [PMID: 20322171 PMCID: PMC1826594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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47
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Campbell AA. ATYPICAL MASTOIDITIS: With Report of Cases. Can Med Assoc J 1930; 22:201-202. [PMID: 20317689 PMCID: PMC381701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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48
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Campbell AA. Cancer of the Larynx. Can Med Assoc J 1925; 15:939-941. [PMID: 20315512 PMCID: PMC1708444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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49
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Campbell AA. Chronic Suppurative Otitis-Media with a Fistula of the External Semi-Circular Canal. Can Med Assoc J 1924; 14:856. [PMID: 20315106 PMCID: PMC1707617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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