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1.
Nat Commun ; 15(1): 6011, 2024 Jul 17.
Article in English | MEDLINE | ID: mdl-39019847

ABSTRACT

Herbivorous insects alter biogeochemical cycling within forests, but the magnitude of these impacts, their global variation, and drivers of this variation remain poorly understood. To address this knowledge gap and help improve biogeochemical models, we established a global network of 74 plots within 40 mature, undisturbed broadleaved forests. We analyzed freshly senesced and green leaves for carbon, nitrogen, phosphorus and silica concentrations, foliar production and herbivory, and stand-level nutrient fluxes. We show more nutrient release by insect herbivores at non-outbreak levels in tropical forests than temperate and boreal forests, that these fluxes increase strongly with mean annual temperature, and that they exceed atmospheric deposition inputs in some localities. Thus, background levels of insect herbivory are sufficiently large to both alter ecosystem element cycling and influence terrestrial carbon cycling. Further, climate can affect interactions between natural populations of plants and herbivores with important consequences for global biogeochemical cycles across broadleaved forests.


Subject(s)
Forests , Herbivory , Insecta , Nitrogen , Plant Leaves , Temperature , Herbivory/physiology , Animals , Insecta/physiology , Plant Leaves/metabolism , Nitrogen/metabolism , Carbon/metabolism , Carbon Cycle , Phosphorus/metabolism , Ecosystem , Trees/metabolism
2.
Am J Epidemiol ; 193(2): 267-276, 2024 Feb 05.
Article in English | MEDLINE | ID: mdl-37715454

ABSTRACT

Estimates of excess mortality can provide insight into direct and indirect impacts of the coronavirus disease 2019 (COVID-19) pandemic beyond deaths specifically attributed to COVID-19. We analyzed death certificate data from Baltimore City, Maryland, from March 1, 2020, to March 31, 2021, and found that 1,725 individuals (95% confidence interval: 1,495, 1,954) died in excess of what was expected from all-cause mortality trends in 2016-2019; 1,050 (61%) excess deaths were attributed to COVID-19. Observed mortality was 23%-32% higher than expected among individuals aged 50 years and older. Non-White residents of Baltimore City also experienced 2 to 3 times higher rates of excess mortality than White residents (e.g., 37.4 vs. 10.7 excess deaths per 10,000 population among Black residents vs. White residents). There was little to no observed excess mortality among residents of hospice, long-term care, and nursing home facilities, despite accounting for nearly 30% (312/1,050) of recorded COVID-19 deaths. There was significant geographic variation in excess mortality within the city, largely following racial population distributions. These results demonstrate the substantial and unequal impact of the COVID-19 pandemic on Baltimore City residents and the importance of building robust, timely surveillance systems to track disparities and inform targeted strategies to remediate the impact of future epidemics.


Subject(s)
COVID-19 , Humans , Middle Aged , Aged , Pandemics , Baltimore/epidemiology , Black People , Demography , Mortality
3.
Glob Chang Biol ; 27(15): 3657-3680, 2021 08.
Article in English | MEDLINE | ID: mdl-33982340

ABSTRACT

Fine roots constitute a significant component of the net primary productivity (NPP) of forest ecosystems but are much less studied than aboveground NPP. Comparisons across sites and regions are also hampered by inconsistent methodologies, especially in tropical areas. Here, we present a novel dataset of fine root biomass, productivity, residence time, and allocation in tropical old-growth rainforest sites worldwide, measured using consistent methods, and examine how these variables are related to consistently determined soil and climatic characteristics. Our pantropical dataset spans intensive monitoring plots in lowland (wet, semi-deciduous, and deciduous) and montane tropical forests in South America, Africa, and Southeast Asia (n = 47). Large spatial variation in fine root dynamics was observed across montane and lowland forest types. In lowland forests, we found a strong positive linear relationship between fine root productivity and sand content, this relationship was even stronger when we considered the fractional allocation of total NPP to fine roots, demonstrating that understanding allocation adds explanatory power to understanding fine root productivity and total NPP. Fine root residence time was a function of multiple factors: soil sand content, soil pH, and maximum water deficit, with longest residence times in acidic, sandy, and water-stressed soils. In tropical montane forests, on the other hand, a different set of relationships prevailed, highlighting the very different nature of montane and lowland forest biomes. Root productivity was a strong positive linear function of mean annual temperature, root residence time was a strong positive function of soil nitrogen content in montane forests, and lastly decreasing soil P content increased allocation of productivity to fine roots. In contrast to the lowlands, environmental conditions were a better predictor for fine root productivity than for fractional allocation of total NPP to fine roots, suggesting that root productivity is a particularly strong driver of NPP allocation in tropical mountain regions.


Subject(s)
Ecosystem , Rainforest , Africa , Biomass , Forests , Plant Roots , Soil , South America , Trees , Tropical Climate
4.
Environ Microbiol ; 22(11): 4702-4717, 2020 11.
Article in English | MEDLINE | ID: mdl-32840945

ABSTRACT

Diverse communities of fungi and bacteria in deadwood mediate wood decay. While rates of decomposition vary greatly among woody species and spatially distinct habitats, the relative importance of these factors in structuring microbial communities and whether these shift over time remains largely unknown. We characterized fungal and bacterial diversity within pieces of deadwood that experienced 6.3-98.8% mass loss while decaying in common garden 'rotplots' in a temperate oak-hickory forest in the Ozark Highlands, MO, USA. Communities were isolated from 21 woody species that had been decomposing for 1-5 years in spatially distinct habitats at the landscape scale (top and bottom of watersheds) and within stems (top and bottom of stems). Microbial community structure varied more strongly with wood traits than with spatial locations, mirroring the relative role of these factors on decay rates on the same pieces of wood even after 5 years. Co-occurring fungal and bacterial communities persistently influenced one another independently from their shared environmental conditions. However, the relative influence of wood construction versus spatial locations differed between fungi and bacteria, suggesting that life history characteristics of these clades structure diversity differently across space and time in decomposing wood.


Subject(s)
Microbiota/physiology , Wood/microbiology , Bacteria/classification , Bacteria/genetics , Bacteria/isolation & purification , Carya/microbiology , Forests , Fungi/classification , Fungi/genetics , Fungi/isolation & purification , Microbial Interactions , Missouri , Quercus/microbiology , Time Factors , Wood/classification
5.
Glob Chang Biol ; 26(2): 864-875, 2020 02.
Article in English | MEDLINE | ID: mdl-31628697

ABSTRACT

Whether global change will drive changing forests from net carbon (C) sinks to sources relates to how quickly deadwood decomposes. Because complete wood mineralization takes years, most experiments focus on how traits, environments and decomposer communities interact as wood decay begins. Few experiments last long enough to test whether drivers change with decay rates through time, with unknown consequences for scaling short-term results up to long-term forest ecosystem projections. Using a 7 year experiment that captured complete mineralization among 21 temperate tree species, we demonstrate that trait effects fade with advancing decay. However, wood density and vessel diameter, which may influence permeability, control how decay rates change through time. Denser wood loses mass more slowly at first but more quickly with advancing decay, which resolves ambiguity about the after-life consequences of this key plant functional trait by demonstrating that its effect on decay depends on experiment duration and sampling frequency. Only long-term data and a time-varying model yielded accurate predictions of both mass loss in a concurrent experiment and naturally recruited deadwood structure in a 32-year-old forest plot. Given the importance of forests in the carbon cycle, and the pivotal role for wood decay, accurate ecosystem projections are critical and they require experiments that go beyond enumerating potential mechanisms by identifying the temporal scale for their effects.


Subject(s)
Ecosystem , Wood , Carbon Cycle , Forests , Trees
6.
Cancer Causes Control ; 29(1): 43-50, 2018 01.
Article in English | MEDLINE | ID: mdl-29124542

ABSTRACT

OBJECTIVE: To evaluate the adoption of HPV testing and recommended extended cervical cancer screening intervals in clinical practice, we described yearly uptake of Pap/HPV cotesting and estimated length of time between normal screens by patient characteristics. METHODS: We examined 55,575 Pap/HPV records from 27,035 women aged 30-65 years from the Johns Hopkins Hospital Pathology Data System between 2006 and 2013. Cotest uptake and median times to next screening test for cotests and cytology only were calculated. Adjusted hazard ratios were estimated using Cox proportional hazards models, with random effects adjustment for clustering within clinic. RESULTS: Cotest usage increased from < 10% in 2006 to 78% in 2013. The median time to next screening test following normal cytology alone remained constant around 1.5 years. Screening intervals following a dual-negative cotest increased from 1.5 years in 2006/2007 to 2.5 years in 2010, coincident with increases in the proportion of women cotested. Intervals following a dual negative cotest were longer among Medicare patients (3 years) compared with privately insured women (2.5 years), and shorter among black (2 years) compared with white women (2.8 years). CONCLUSION: By mid-2013 we observed broad adoption of Pap/HPV cotesting in routine screening in a large academic medical center. Increased screening intervals were observed only among cotested women, while those screened by cytology alone continued to be screened almost annually. The influence of different combinations of race and insurance on screening intervals should be further evaluated to ensure balance of screening risks and benefits in the U.S.


Subject(s)
Early Detection of Cancer , Papillomavirus Infections/diagnosis , Uterine Cervical Neoplasms/diagnosis , Adult , Aged , Cytodiagnosis , Female , Humans , Mass Screening , Middle Aged , Papanicolaou Test , Vaginal Smears
7.
Ir J Med Sci ; 187(2): 313-318, 2018 May.
Article in English | MEDLINE | ID: mdl-28702828

ABSTRACT

OBJECTIVE: With increasing surgeon experience, the use of laparoscopic radical nephrectomy (LRN) in large and locally advanced renal tumours (T3a) is gaining favour in urological practice. There are limited studies reporting surgical outcomes in such groups. The aim of this study was to review our experience with LRN in these patients. METHODS: Data was retrospectively collected on 201 consecutive patients who underwent LRN for renal cancer by a single surgeon. Perioperative parameters assessed were age, gender, American Society of Anaesthesiologists score (ASA), waist circumference, tumour size, specimen size, histological subtypes, anaesthetic duration, operative approach and technique, surgery duration, blood loss, pre and postoperative renal function, complication rate and duration of hospital stay. RESULTS: Of 201 patients undergoing LRN, 43 (21%) patients had T3a tumours (group 2). The remaining 158 (79%) patients had T1 tumours (group1). Mean tumour size in group 2 was 12.2 cm. Renal cell carcinoma (RCC) was more common in males than females (131/201; 65%). Patients with T3a disease were more likely to have an ASA score of 2 (37/201; 18%). In the majority of patients across both groups, LRN was completed using a 3-port approach (173/201; 86%). There were no significant differences between groups in terms of mean anaesthetic duration, average surgical time, average estimated blood loss, complication rate and mean hospital stay. CONCLUSION: Our study shows that LRN has equivalent perioperative outcomes and safety in larger and locally advanced renal tumours.


Subject(s)
Carcinoma, Renal Cell/complications , Carcinoma, Renal Cell/surgery , Laparoscopy/methods , Nephrectomy/methods , Perioperative Care/methods , Aged , Carcinoma, Renal Cell/pathology , Female , Humans , Ireland , Male , Middle Aged , Retrospective Studies
8.
Cancer Epidemiol Biomarkers Prev ; 25(2): 351-8, 2016 Feb.
Article in English | MEDLINE | ID: mdl-26698909

ABSTRACT

BACKGROUND: Despite the recommendation for routine human papillomavirus (HPV) vaccination in males, coverage estimates remain low. We sought to identify predictors of receiving each HPV vaccine dose among a large clinical population of males. METHODS: We conducted a cross-sectional analysis of electronic medical records for 14,688 males ages 11 to 26 years attending 26 outpatient clinics (January 2012-April 2013) in Maryland to identify predictors of each HPV vaccine dose using multivariate logistic regression models with generalized estimating equations. All analyses were stratified in accordance with vaccine age recommendations: 11 to 12 years, 13 to 21 years, and 22 to 26 years. Analyses of predictors of receipt of subsequent HPV doses were also stratified by the number of clinic visits (≤3 and >3). RESULTS: Approximately 15% of males initiated the HPV vaccine. Less than half of males eligible received the second and third doses, 49% and 47%, respectively. Non-Hispanic black males (vs. non-Hispanic white) ages 11 to 12 and 13 to 21 years and males with public insurance (vs. private) ages 13 to 21 years had significantly greater odds of vaccine initiation, but significantly decreased odds of receiving subsequent doses, respectively. Attendance to >3 clinic visits attenuated the inverse association between public insurance and receipt of subsequent doses. CONCLUSION: Overall, rates of HPV vaccine initiation and of subsequent doses were low. While non-Hispanic black and publicly insured males were more likely to initiate the HPV vaccine, they were less likely to receive subsequent doses. IMPACT: Tailoring different intervention strategies for increasing HPV vaccine initiation versus increasing rates of subsequent doses among males may be warranted.


Subject(s)
Papillomavirus Infections/prevention & control , Adolescent , Adult , Child , Cross-Sectional Studies , History, 21st Century , Humans , Male , Papillomavirus Infections/virology , Papillomavirus Vaccines/administration & dosage , Vaccination , Young Adult
9.
J Racial Ethn Health Disparities ; 2(2): 176-83, 2015 Jun.
Article in English | MEDLINE | ID: mdl-26863336

ABSTRACT

PURPOSE: We examined the association between socioeconomic status (SES) and prostate-specific antigen (PSA) cancer screening among older African American men. METHODS: We analyzed baseline data from a sample of 485 community-dwelling African American men who participated in the Cancer Prevention and Treatment Demonstration Trial. The outcome was receipt of PSA screening within the past year. SES was measured using income and educational attainment. Sequential multivariate logistic regression models were performed to study whether health care access, patient-provider relationship, and cancer fatalism mediated the relationship between SES and PSA screening. RESULTS: Higher educational attainment was significantly associated with higher odds of PSA screening in the past year (odds ratio (OR) 2.08 for college graduate compared to less than high school graduate, 95 % confidence interval (CI) 1.03-4.24); income was not. Health care access and patient-provider communication did not alter the relationship between education and screening; however, beliefs regarding cancer fatalism partially mediated the observed relationship. CONCLUSION: Rates of prostate cancer screening among African American men vary by level of educational attainment; beliefs concerning cancer fatalism help explain this gradient. Understanding the determinants of cancer fatalism is a critical next step in building interventions that seek to ensure equitable access to prostate cancer screening.


Subject(s)
Black or African American/statistics & numerical data , Early Detection of Cancer/statistics & numerical data , Medicare/statistics & numerical data , Prostate-Specific Antigen/blood , Social Class , Urban Population/statistics & numerical data , Aged , Educational Status , Humans , Male , Prostatic Neoplasms/ethnology , Prostatic Neoplasms/prevention & control , United States
10.
Cancer Causes Control ; 26(2): 239-246, 2015 Feb.
Article in English | MEDLINE | ID: mdl-25516073

ABSTRACT

PURPOSE: In recent years, colorectal cancer (CRC) screening rates have increased steadily in the USA, though racial and ethnic disparities persist. In a community-based randomized controlled trial, we investigated the effect of patient navigation on increasing CRC screening adherence among older African Americans. METHODS: Participants in the Cancer Prevention and Treatment Demonstration were randomized to either the control group, receiving only printed educational materials (PEM), or the intervention arm where they were assigned a patient navigator in addition to PEM. Navigators assisted participants with identifying and overcoming screening barriers. Logistic regression analyses were used to assess the effect of patient navigation on CRC screening adherence. Up-to-date with screening was defined as self-reported receipt of colonoscopy/sigmoidoscopy in the previous 10 years or fecal occult blood testing (FOBT) in the year prior to the exit interview. RESULTS: Compared with controls, the intervention group was more likely to report being up-to-date with CRC screening at the exit interview (OR 1.55, 95 % CI 1.07-2.23), after adjusting for select demographics. When examining the screening modalities separately, the patient navigator increased screening for colonoscopy/sigmoidoscopy (OR 1.53, 95 % CI 1.07-2.19), but not FOBT screening. Analyses of moderation revealed stronger effects of navigation among participants 65-69 years and those with an adequate health literacy level. CONCLUSIONS: In a population of older African Americans adults, patient navigation was effective in increasing the likelihood of CRC screening. However, more intensive navigation may be necessary for adults over 70 years and individuals with low literacy levels.


Subject(s)
Colonoscopy/statistics & numerical data , Colorectal Neoplasms/diagnosis , Colorectal Neoplasms/ethnology , Early Detection of Cancer/methods , Patient Navigation/statistics & numerical data , Sigmoidoscopy/statistics & numerical data , Black or African American , Aged , Aged, 80 and over , Female , Guideline Adherence , Healthcare Disparities , Humans , Male , Occult Blood , Patient Education as Topic , Patient Navigation/methods , Surveys and Questionnaires , Urban Population
11.
Clin Oral Investig ; 18(7): 1853-64, 2014 Sep.
Article in English | MEDLINE | ID: mdl-24327234

ABSTRACT

OBJECTIVES: The aim of this study was to undertake a qualitative and quantitative evaluation of changes on enamel surfaces after debonding of brackets followed by finishing procedures, using a high-resolution three-dimensional optical profiler and to investigate the accuracy of the technique. MATERIALS AND METHODS: The labial surfaces of 36 extracted upper central incisors were examined. Before bonding, the enamel surfaces were subjected to profilometry, recording four amplitude parameters. Brackets were then bonded using two types of light-cured orthodontic adhesive: composite resin and resin-modified glass ionomer cement. Finishing was performed by three different methods: pumice on a rubber cup, fine and ultrafine aluminum oxide discs, and microfine diamond cups followed by silicon carbide brushes. The samples were subsequently re-analyzed by profilometry. RESULTS: Wilcoxon signed-rank test, Kruskal-Wallis test (p < 0.05) and a posteriori Mann-Whitney U test with Bonferroni correction (p < 0.0167) revealed a significant reduction of enamel roughness when diamond cups followed by silicon carbide brushes were used to finish surfaces that had remnants of resin-modified glass ionomer adhesive and when pumice was used to finish surfaces that had traces of composite resin. Enamel loss was minimal. CONCLUSIONS: The 3D optical profilometry technique was able to provide accurate qualitative and quantitative assessment of changes on the enamel surface after debonding. CLINICAL RELEVANCE: Morphological changes in the topography of dental surfaces, especially if related to enamel loss and roughness, are of considerable clinical importance. The quantitative evaluation method used herein enables a more comprehensive understanding of the effects of orthodontic bonding on teeth.


Subject(s)
Dental Debonding/methods , Dental Enamel/ultrastructure , Imaging, Three-Dimensional , Optical Imaging/methods , Orthodontic Brackets , Humans , In Vitro Techniques , Incisor , Surface Properties
12.
Ecol Lett ; 17(3): 324-32, 2014 Mar.
Article in English | MEDLINE | ID: mdl-24372865

ABSTRACT

The functional role of herbivores in tropical rainforests remains poorly understood. We quantified the magnitude of, and underlying controls on, carbon, nitrogen and phosphorus cycled by invertebrate herbivory along a 2800 m elevational gradient in the tropical Andes spanning 12°C mean annual temperature. We find, firstly, that leaf area loss is greater at warmer sites with lower foliar phosphorus, and secondly, that the estimated herbivore-mediated flux of foliar nitrogen and phosphorus from plants to soil via leaf area loss is similar to, or greater than, other major sources of these nutrients in tropical forests. Finally, we estimate that herbivores consume a significant portion of plant carbon, potentially causing major shifts in the pattern of plant and soil carbon cycling. We conclude that future shifts in herbivore abundance and activity as a result of environmental change could have major impacts on soil fertility and ecosystem carbon sequestration in tropical forests.


Subject(s)
Carbon Cycle/physiology , Ecosystem , Food , Herbivory/physiology , Models, Biological , Plant Leaves/chemistry , Trees , Animals , Peru , Spectrum Analysis , Tropical Climate
13.
Cancer Epidemiol Biomarkers Prev ; 22(6): 1037-42, 2013 Jun.
Article in English | MEDLINE | ID: mdl-23629519

ABSTRACT

BACKGROUND: Previous research has shown colorectal cancer (CRC) screening disparities by gender. Little research has focused primarily on gender differences among older Black individuals, and reasons for existing gender differences remain poorly understood. METHODS: We used baseline data from the Cancer Prevention and Treatment Demonstration Screening Trial. Participants were recruited from November 2006 to March 2010. In-person interviews were used to assess self-reported CRC screening behavior. Up-to-date CRC screening was defined as self-reported colonoscopy or sigmoidoscopy in the past 10 years or fecal occult blood testing in the past year. We used multivariable logistic regression to examine the association between gender and self-reported screening, adjusting for covariates. The final model was stratified by gender to examine factors differentially associated with screening outcomes for males and females. RESULTS: The final sample consisted of 1,552 female and 586 male Black Medicare beneficiaries in Baltimore, Maryland. Males were significantly less likely than females to report being up-to-date with screening (77.5% vs. 81.6%, P = 0.030), and this difference was significant in the fully adjusted model (OR: 0.72; 95% confidence interval, 0.52-0.99). The association between having a usual source of care and receipt of cancer screening was stronger among males compared with females. CONCLUSIONS: Although observed differences in CRC screening were small, several factors suggest that gender-specific approaches may be used to promote screening adherence among Black Medicare beneficiaries. IMPACT: Given disproportionate CRC mortality between White and Black Medicare beneficiaries, gender-specific interventions aimed at increasing CRC screening may be warranted among older Black patients.


Subject(s)
Adenocarcinoma/diagnosis , Black or African American/statistics & numerical data , Colorectal Neoplasms/diagnosis , Early Detection of Cancer , White People/statistics & numerical data , Adenocarcinoma/prevention & control , Aged , Aged, 80 and over , Baltimore , Colonoscopy , Colorectal Neoplasms/prevention & control , Female , Follow-Up Studies , Humans , Male , Medicare , Occult Blood , Prognosis , Sex Factors , Sigmoidoscopy , United States
14.
Am J Clin Pathol ; 138(2): 223-9, 2012 Aug.
Article in English | MEDLINE | ID: mdl-22904133

ABSTRACT

The use of human papillomavirus DNA testing plus Papanicolaou (Pap) testing (cotesting) for cervical cancer screening in women 30 years and older has been recommended since 2006. However, few studies have detailed the adoption of such cotesting in clinical practice. We examined the trends in monthly percentage of Pap tests ordered as cotests in our laboratory over a 2.5-year period and used joinpoint regression to identify periods in which there was a change in the average monthly proportion of cotests. Cotesting of patients 30 years and older increased from 15.9% in January 2008 to 39.4% in June 2010. In patients aged 18 to 29 years, cotesting initially increased, but showed a downward trend in the last 14 months of the study, ending at 7.7% in June 2010. Our study highlights increased adoption of age-appropriate cotesting as well as the persistence of age-inappropriate cotesting.


Subject(s)
Early Detection of Cancer/statistics & numerical data , Mass Screening/methods , Papanicolaou Test , Practice Patterns, Physicians'/statistics & numerical data , Tumor Virus Infections/prevention & control , Uterine Cervical Neoplasms/prevention & control , Vaginal Smears/statistics & numerical data , Adolescent , Adult , Aged , Aged, 80 and over , Cervix Uteri/virology , Female , Humans , Maryland , Mass Screening/statistics & numerical data , Middle Aged , Papillomaviridae , Tumor Virus Infections/diagnosis , Tumor Virus Infections/virology , Uterine Cervical Neoplasms/diagnosis , Uterine Cervical Neoplasms/virology , Young Adult
15.
Obstet Gynecol ; 118(2 Pt 1): 289-295, 2011 Aug.
Article in English | MEDLINE | ID: mdl-21775844

ABSTRACT

OBJECTIVE: To estimate time trends of actual provider use of human papillomavirus (HPV) testing in cervical cancer screening by using laboratory and administrative data from the Johns Hopkins Hospital Division of Cytopathology in Baltimore, Maryland. METHODS: In this ecologic trend study, we analyzed 178,510 Pap specimen records and 12,221 HPV tests among 85,048 patients from 2001 to 2007. Monthly frequencies and proportions of HPV reflex testing and HPV cotesting with Pap (stratified by patient ages 30 and older and 18-29 years) were calculated. Time trends of monthly HPV testing proportions were analyzed using joinpoint regression methods. RESULTS: From April 2002, when the American Society for Colposcopy and Cervical Pathology added HPV reflex testing to its guidelines, to December 2007, the monthly the proportion of reflex testing was 95.8%. From February 2004, when the society added HPV cotesting with Pap among women aged 30 years or older to its guidelines, to December 2007, the overall proportion HPV cotesting with Pap among patients aged 30 years or older was 7.8% (compared with 4.9% among patients 18-29 years [P<.01]). The highest proportion of HPV cotesting among women aged 30 years or older, 15%, was observed in September 2006, and the trend later plateaued around 13%. The monthly proportions of HPV reflex testing and cotesting with Pap changed significantly over time. CONCLUSION: These data reveal that a small percentage of women aged 30 years or older received HPV cotesting with Pap, thus identifying a significant opportunity for providers to improve patient care in cervical cancer prevention. LEVEL OF EVIDENCE: III.


Subject(s)
Papillomaviridae , Papillomavirus Infections/diagnosis , Uterine Cervical Neoplasms/diagnosis , Vaginal Smears , Academic Medical Centers , Adult , Female , Humans , Middle Aged , Uterine Cervical Neoplasms/virology , Vaginal Smears/statistics & numerical data , Young Adult
16.
Sex Transm Dis ; 36(3): 149-56, 2009 Mar.
Article in English | MEDLINE | ID: mdl-19174735

ABSTRACT

BACKGROUND: We sought to identify factors associated with newly detected human papillomavirus (HPV) infection in a high-risk cohort of injection drug using women in Baltimore, MD. METHODS: We studied 146 HIV-infected and 73 HIV-uninfected female participants in a 5-year prospective HIV natural history study. We examined the association of sexual and nonsexual risk factors and newly detected type-specific HPV infection as determined by consensus PCR between consecutive visits. RESULTS: Newly detected HPV was more common among HIV-infected versus HIV-uninfected women (30% and 6%, respectively; P <0.01). Among the entire cohort, recent crack use (OR, 1.7; 95% CI, 1.1-2.6) and HIV infection/CD4 cell count were independent predictors for new HPV detection (HIV-uninfected as reference, OR, 4.6; 95% CI, 2.3-8.9, OR, 5.4; 95% CI, 2.8-10.3, and OR, 10.9; 95% CI, 5.5-21.7 for HIV-infected CD4 >500, 200-500, and <200, respectively). Among HIV-uninfected women, recent marijuana use was an independent predictor of newly detected HPV infection (OR, 3.5; 95% CI, 1.3-9.5). CONCLUSIONS: Newly detected HPV clearly increased with greater immunosuppression in HIV-infected injection drug users. Larger studies of HIV-uninfected and infected high-risk individuals are needed to clarify the independent associations of crack and marijuana use with new (or reactivated) HPV infection.


Subject(s)
HIV Infections/complications , Papillomavirus Infections/diagnosis , Substance Abuse, Intravenous/complications , Tumor Virus Infections/complications , Adult , Baltimore/epidemiology , Cannabis , Cohort Studies , Crack Cocaine , Female , HIV Infections/epidemiology , HIV Infections/virology , HIV-1 , Humans , Middle Aged , Papillomaviridae/genetics , Papillomavirus Infections/complications , Papillomavirus Infections/epidemiology , Papillomavirus Infections/virology , Prospective Studies , Risk Factors , Risk-Taking , Sexual Behavior , Substance Abuse, Intravenous/epidemiology , Tumor Virus Infections/diagnosis , Tumor Virus Infections/epidemiology , Tumor Virus Infections/virology
17.
J Mol Biol ; 359(4): 1059-74, 2006 Jun 16.
Article in English | MEDLINE | ID: mdl-16701697

ABSTRACT

Structural changes on LexA repressor promoted by acidic pH have been investigated. Intense protein aggregation occurred around pH 4.0 but was not detected at pH values lower than pH 3.5. The center of spectral mass of the Trp increased 400 cm(-1) at pH 2.5 relatively to pH 7.2, an indication that LexA has undergone structural reorganization but not denaturation. The Trp fluorescence polarization of LexA at pH 2.5 indicated that its hydrodynamic volume was larger than its dimer at pH 7.2. 4,4'-Dianilino-1,1'-binaphthyl-5,5'- disulfonic acid (bis-ANS) experiments suggested that the residues in the hydrophobic clefts already present at the LexA structure at neutral pH had higher affinity to it at pH 2.5. A 100 kDa band corresponding to a tetramer was obtained when LexA was subject to pore-limiting native polyacrylamide gel electrophoresis at this pH. The existence of this tetrameric state was also confirmed by small angle X-ray scattering (SAXS) analysis at pH 2.5. 1D 1H NMR experiments suggested that it was composed of a mixture of folded and unfolded regions. Although 14,000-fold less stable than the dimeric LexA, it showed a tetramer-monomer dissociation at pH 2.5 from the hydrostatic pressure and urea curves. Albeit with half of the affinity obtained at pH 7.2 (Kaff of 170 nM), tetrameric LexA remained capable of binding recA operator sequence at pH 2.5. Moreover, different from the absence of binding to the negative control polyGC at neutral pH, LexA bound to this sequence with a Kaff value of 1415 nM at pH 2.5. A binding stoichiometry experiment at both pH 7.2 and pH 2.5 showed a [monomeric LexA]/[recA operator] ratio of 2:1. These results are discussed in relation to the activation of the Escherichia coli SOS regulon in response to environmental conditions resulting in acidic intracellular pH. Furthermore, oligomerization of LexA is proposed to be a possible regulation mechanism of this regulon.


Subject(s)
Bacterial Proteins/chemistry , Bacterial Proteins/metabolism , Escherichia coli/genetics , Gene Expression Regulation, Bacterial , SOS Response, Genetics/physiology , Serine Endopeptidases/chemistry , Serine Endopeptidases/metabolism , Anilino Naphthalenesulfonates/chemistry , Bacterial Proteins/genetics , Circular Dichroism , DNA, Bacterial/metabolism , Dimerization , Hydrogen-Ion Concentration , Magnetic Resonance Spectroscopy , Protein Conformation , Repressor Proteins/chemistry , Repressor Proteins/metabolism , Scattering, Radiation , Serine Endopeptidases/genetics , Solutions , Thermodynamics , X-Rays
18.
J Bacteriol ; 187(16): 5568-77, 2005 Aug.
Article in English | MEDLINE | ID: mdl-16077101

ABSTRACT

This work reports the results of analyses of three complete mycoplasma genomes, a pathogenic (7448) and a nonpathogenic (J) strain of the swine pathogen Mycoplasma hyopneumoniae and a strain of the avian pathogen Mycoplasma synoviae; the genome sizes of the three strains were 920,079 bp, 897,405 bp, and 799,476 bp, respectively. These genomes were compared with other sequenced mycoplasma genomes reported in the literature to examine several aspects of mycoplasma evolution. Strain-specific regions, including integrative and conjugal elements, and genome rearrangements and alterations in adhesin sequences were observed in the M. hyopneumoniae strains, and all of these were potentially related to pathogenicity. Genomic comparisons revealed that reduction in genome size implied loss of redundant metabolic pathways, with maintenance of alternative routes in different species. Horizontal gene transfer was consistently observed between M. synoviae and Mycoplasma gallisepticum. Our analyses indicated a likely transfer event of hemagglutinin-coding DNA sequences from M. gallisepticum to M. synoviae.


Subject(s)
Genome, Bacterial , Mycoplasma Infections/microbiology , Mycoplasma hyopneumoniae/genetics , Mycoplasma synoviae/genetics , Pneumonia of Swine, Mycoplasmal/microbiology , Poultry Diseases/microbiology , Animals , Evolution, Molecular , Gene Rearrangement , Gene Transfer, Horizontal , Genomics , Molecular Sequence Data , Phylogeny , Poultry , Swine
19.
Genet Mol Res ; 3(1): 26-52, 2004 Mar 31.
Article in English | MEDLINE | ID: mdl-15100986

ABSTRACT

A new tool called System for Automated Bacterial Integrated Annotation--SABIA (SABIA being a very well-known bird in Brazil) was developed for the assembly and annotation of bacterial genomes. This system performs automatic tasks of assembly analysis, ORFs identification/analysis, and extragenic region analyses. Genome assembly and contig automatic annotation data are also available in the same working environment. The system integrates several public domains and newly developed software programs capable of dealing with several types of databases, and it is portable to other operational systems. These programs interact with most of the well-known biological database/softwares, such as Glimmer, Genemark, the BLAST family programs, InterPro, COG, Kegg, PSORT, GO, tRNAScan and RBSFinder, and can also be used to identify metabolic pathways.


Subject(s)
Chromobacterium/genetics , Computational Biology/methods , Databases, Genetic , Genome, Bacterial , Software , Brazil , Computational Biology/instrumentation
20.
Bioinformatics ; 20(16): 2832-3, 2004 Nov 01.
Article in English | MEDLINE | ID: mdl-15087310

ABSTRACT

UNLABELLED: A web-based software suite, SABIA (System for Automated Bacterial Integrated Annotation), is described that provides a comprehensive computational support for the assembly and annotation of whole bacterial genomes from the data derived from sequencing projects. AVAILABILITY: Both SABIA and supplementary materials are available at http://www.sabia.lncc.br


Subject(s)
Algorithms , Chromosome Mapping/methods , Databases, Genetic , Documentation/methods , Genome, Bacterial , Sequence Analysis, DNA/methods , Software , Sequence Alignment/methods , User-Computer Interface
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