Search for neutral, long-lived particles decaying into two muons in pp[over] collisions at sqrt[s]=1.96 TeV

We present a search for a neutral particle, pair produced in pp[over] collisions at sqrt[s]=1.96 TeV, which decays into two muons and lives long enough to travel at least 5 cm before decaying. The analysis uses approximately 380 pb(-1) of data recorded with the D0 detector. The background is estimated to be about one event. No candidates are observed, and limits are set on the pair-production cross section times branching fraction into dimuons + X for such particles. For a mass of 10 GeV and lifetime of 4x10(-11) s, we exclude values greater than 0.14 pb (95% C.L.). These results are used to limit the interpretation of NuTeV's excess of dimuon events.

Search for the standard model Higgs Boson in the pp[over]-->ZH-->nunu[over]bb[over] channel

We report a search for the standard model (SM) Higgs boson based on data collected by the D0 experiment at the Fermilab Tevatron Collider, corresponding to an integrated luminosity of 260 pb(-1). We study events with missing transverse energy and two acoplanar b jets, which provide sensitivity to the ZH production cross section in the nunu[over]bb[over] channel, and to WH production when the lepton from the W-->lnu decay is undetected. The data are consistent with the SM background expectation, and we set 95% C.L. upper limits on sigma(pp[over]-->ZH/WH)xB(H-->bb[over]) from 3.4/8.3 to 2.5/6.3 pb, for Higgs-boson masses between 105 and 135 GeV.

Search for associated higgs boson production WH-->WWW*-->l+/-nul'+/-nu'+X in pp collisions at square root s=1.96 Te V

We present a search for associated Higgs boson production in the process pp-->WH-->WWW*-->l;+/-nul'+/-nu'+X in final states containing two like-sign isolated electrons or muons (e+/-e;+/-, e+/-micro+/-, or micro+/-micro+/-). The search is based on D0 run II data samples corresponding to integrated luminosities of 360-380 pb-1. No excess is observed over the predicted standard model background. We set 95% C.L. upper limits on sigma(pp-->WH)xBr(H-->WW*) between 3.2 and 2.8 pb for Higgs boson masses from 115 to 175 GeV.

Mutations in FRMD7, a newly identified member of the FERM family, cause X-linked idiopathic congenital nystagmus

Idiopathic congenital nystagmus is characterized by involuntary, periodic, predominantly horizontal oscillations of both eyes. We identified 22 mutations in FRMD7 in 26 families with X-linked idiopathic congenital nystagmus. Screening of 42 singleton cases of idiopathic congenital nystagmus (28 male, 14 females) yielded three mutations (7%). We found restricted expression of FRMD7 in human embryonic brain and developing neural retina, suggesting a specific role in the control of eye movement and gaze stability.

Search for neutral Higgs bosons decaying to tau pairs in pp[over ] collisions at sqrt[s]=1.96 TeV

A search for the production of neutral Higgs bosons Phi decaying into tau(+)tau(-) final states in pp[over ] collisions at a center-of-mass energy of 1.96 TeV is presented. The data, corresponding to an integrated luminosity of approximately 325 pb(-1), were collected by the D0 experiment at the Fermilab Tevatron Collider. Since no excess compared to the expectation from standard model processes is found, limits on the production cross section times branching ratio are set. The results are combined with those obtained from the D0 search for Phib(b[over ])-->bb[over ]b(b[over ]) and are interpreted in the minimal supersymmetric standard model.

Screening for age-related macular degeneration using nonstereo digital fundus photographs

Age-related macular degeneration (AMD) is a disease with significant visual morbidity and accounts for the majority of blind registrations in the developed world including the UK. Certain forms of neovascular AMD are amenable to treatment but require expeditious referral to a retinal specialist.

AIM

To evaluate the possibility of using nonstereo fundus photographs as a low-cost screening tool for neovascular AMD.

DESIGN

Retrospective review of patients referred to the macular clinic of a teaching hospital in London.

METHODS

A total of 198 randomised digital fundus photographs, without any other clinical information, were presented to two independent ophthalmic interns who graded them into one of the three categories: normal, age-related maculopathy (ARM), or neovascular age-related macular degeneration (AMD) to determine the urgency of referral to clinic. The results were compared with the known diagnosis for each patient and sensitivities and specificities for each diagnostic category calculated.

RESULTS

The intraobserver Kappa statistic was 0.75 and 0.91 for grader 1 and 2, respectively. The interobserver Kappa was 0.54. The mean sensitivity and specificity for the identification of ARM was 60.5 and 76.3%, respectively The mean sensitivity and specificity for the identification of AMD was 85.7 and 78.8%, respectively.

CONCLUSION

Nonstereo digital fundus photograph is a reasonable screening tool for CNV and may aid in decreasing the visual morbidity it causes by enabling timely referrals and treatment.

Search for resonant second generation slepton production at the Fermilab Tevatron

We present a search for supersymmetry in the R-parity violating resonant production and decay of smuons and muon sneutrinos in the channels mu-->chi(1)(0)mu, mu-->chi(2,3,4)(0)mu, and nu(mu)-->chi(1,2)(+/-)mu. We analyzed 0.38 fb(-1) of integrated luminosity collected between April 2002 and August 2004 with the D0 detector at the Fermilab Tevatron Collider. The observed number of events is in agreement with the standard model expectation, and we calculate 95% C.L. limits on the slepton production cross section times branching fraction to gaugino plus muon, as a function of slepton and gaugino masses. In the framework of minimal supergravity, we set limits on the coupling parameter lambda(211)('), extending significantly previous results obtained in Run I of the Tevatron and at the CERN LEP collider.

Once daily bioadhesive vaginal clotrimazole tablets: design and evaluation

In this study, a bioadhesive dosage form of clotrimazole was designed using a combination of bioadhesive polymers Carbopol 934P, sodium carboxymethyl cellulose and sodium alginate in different ratios. The bioadhesive strength was evaluated by measuring the force required to detach the tablets from porcine vaginal mucosal membrane. The strong interaction between polymer and mucus lining of the tissue helps increase the contact time and permits localization of activity. Carbopol 934P showed maximum bioadhesion and required maximum force for detachment; the force required for detachment was directly proportional to its content. The formulations were tested for their swelling behavior using the agar gel plate method. The swelling index was a function of the concentration of the hydrophilic polymer and the formulations containing Carbopol 934P and sodium carboxymethyl cellulose were found to swell to a greater extent than those containing Carbopol and sodium alginate. In vitro release studies showed that the batch consisting of 2:1 ratio of Carbopol 934P/sodium alginate (batch C3) released clotrimazole over 24 h. The similarity factor showed that the dissolution profiles of fresh and aged tablets were similar, suggesting good stability of vaginal tablets prepared using a combination of Carbopol 934P and sodium alginate.

HIV immunosupression and malaria: is there a correlation?

The human immunodeficiency virus (HIV) epidemic has resulted in an increase in the prevalence of many opportunistic infections and has caused re-emergence of certain diseases in the developing world. In tropical countries, immunosupression due to HIV infection has resulted in changes in the clinical presentation of endemic infections. Although the immune deficiency caused by HIV infection should presumably lead to an increased frequency of clinical malaria in areas with endemic malarial infection, like India, evidence of the association between HIV and malaria in India is scanty, with only a few studies showing a positive correlation. We hereby report a case of concurrent infection with Plasmodium falciparum malaria and human immunodeficiency virus type 1 (HIV-1) in a young male patient.

Microwave-assisted rapid cyclization of lapachol, a main constituent ofHeterophragma adenophyllum

Cyclization reactions of lapachol (1) isolated from Heterophragma adenophyllum have been studied under microwave irradiation under different conditions using alumina (acidic, basic and neutral)/silica gel/montmorillonite (KSF and K-10) as solid support along with neat reaction using 2-3 drops of DMF giving naturally occurring dehydro-alpha-lapachone (2), alpha-lapachone (3), beta-lapachone (4) depending upon the nature of support and irradiation time. A novel naphthoquinone derivative adenophyllone (5) can be synthesized from lapachol using DMF under microwaves.

Penile prosthetic surgery and its role in the treatment of end-stage erectile dysfunction - an update

The treatment of erectile dysfunction has been revolutionised with the introduction of orally active phosphodiesterase inhibitors which are successful in 70-80% of men. However, there remain a group of men in whom conservative treatment fails and surgical insertion of a penile prosthesis is required. This type of surgery has in the past been associated with technical difficulties and a high complication rate. This has spurred numerous developments in prosthesis design and surgical technique with the field changing at a rapid pace. Perhaps the most significant is the use of antimicrobial coatings on prostheses that have been shown to reduce the infection rate significantly. This review highlights those developments reported in the last 5 years.

Madmen and specialists: the clientele and the staff of the Lunatic Asylum, Bangalore

The history of the asylum has proven to be an invaluable resource for exploring the interface between science, medicine, religion and social and political processes. The definitions of insanity have troubled humans for centuries, as have the methods for treatment. Diverse, and often conflicting, ideological positions are quite common. Documenting the specific histories of the staff and patients of an asylum can thus help us understand the evolution of the physical and the intellectual growth of psychiatry in India. In this endeavour, we have used the records of the Lunatic Asylum, Bangalore (later the All India Institute of Mental Health and subsequently the National Institute of Mental Health and Neurosciences [NIMHANS]) to explore the history of psychiatry in India. The only asylum maintained by a 'Native Kingdom', it exemplifies the dynamics of the growth of mental health services in the country. We trace the changes in administrative control of the Asylum, the changes in medical practice and some aspects of the social history of the region. This article traces the history of psychiatry at one institution, which, at the micro level, is a mirror to the understanding of the historical trends of psychiatric services in India.

Direct limits on the oscillation frequency

We report results of a study of the B(s)(0) oscillation frequency using a large sample of B(s)(0) semileptonic decays corresponding to approximately 1 fb(-1) of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider in 2002-2006. The amplitude method gives a lower limit on the B(s)(0) oscillation frequency at 14.8 ps(-1) at the 95% C.L. At delta m(s) = 19 ps(-1), the amplitude deviates from the hypothesis A= 0(1) by 2.5 (1.6) standard deviations, corresponding to a two-sided C.L. of 1% (10%). A likelihood scan over the oscillation frequency, delta m(s), gives a most probable value of 19 ps(-1) and a range of 17 < delta m(s) < 21 ps(-1)at the 90% C.L., assuming Gaussian uncertainties. This is the first direct two-sided bound measured by a single experiment. If delta m(s) lies above 22 ps(-1), then the probability that it would produce a likelihood minimum similar to the one observed in the interval 16-22 ps(-1) is (5.0 +/- 0.3)%.

Association of CYP2D6 100 C > T and 2850 C > T polymorphisms with generalized tonic clonic seizures among Indians

Multiple avenues of research have provided evidence for the role of genetic and environmental factors in epilepsy. Previous studies indicated an association of debrisoquine hydroxylase (CYP2D6) with susceptibility to epilepsy. In this study, association of CYP2D6 100C > T and 2850C > T polymorphisms with generalized tonic clonic seizures (GTCS) among Indians has been analysed using case-control approach. A significant association of 2850C > T (P = 0.015) has been observed. Comparison between phenytoin toxic and others among patients showed no association of these polymorphisms with phenytoin toxicity.

Polysomnographic measures of sleep moderate the relationship between depression and pain

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Background: We explored the effects of polysomnographic measures of nocturnal sleep on depression and pain in advanced cancer patients taking opioids. Methods: The sample included 72 subjects (solid tumor, Stages III/IV) with a mean age of 55.9 (9.1); 39 were male. All were taking opioids. Subjects underwent ambulatory polysomnography for 48 hours in their homes. Nocturnal sleep parameters included total sleep time (minutes); sleep efficiency (SE; %); sleep latency (SL; minutes); rapid-eye-movement sleep latency (REML; minutes); the percentages (%) of non-rapid eye movement (NREM) Stages 1, 2, and slow wave sleep (SWS, 3 & 4), and REM sleep; and the number of awakenings > 60 seconds. Subjects kept an opioid diary, data from which were converted into a mean hourly morphine equivalent dose (HMED). Subjects also completed the Brief Pain Inventory (BPI) and the Beck Depression Inventory (BDI). Descriptive, correlation, and regression procedures were used for data analysis. Results: Subjects had a mean nocturnal sleep period of 400.1 ± 97.4 minutes. The SL was normal at 26.5 ± 42.6 minutes but the SE was low (77.5 ± 13.2%). Most sleep was light NREM Stages 1 and 2 with decreased amounts of deep SWS (0.3 ± 2.7%) and REM sleep (14.4 ± 8.5%). The REML was prolonged at 149.1 ± 105.1 minutes. The mean BPI scores for pain intensity and interference were 4.4 ± 1.4 and 5.0 ± 2.1, respectively. The mean BDI score was 13.7 ± 7.9. The average HMED was .59 ± .1. Controlling for age and gender, regression analyses revealed that SWS and REM sleep moderated the relationship between depression and pain. Those with more SWS had lower depression levels in spite of higher pain intensity (t = -2.8, p = .007) while those with more REM sleep had lower depression levels despite higher pain interference (t = -2.0, p = .045). Controlling for pain intensity and interference, HMED was positively associated with Stage 1 % (r = .36, p = .001) and the number of nocturnal awakenings > 60 seconds (r = .28, p = .019). Conclusions: Opioids may lighten and disrupt sleep altering sleep cycle progression. The resulting decrements in SWS and REM sleep may lead to increased depression and enhanced pain. Consideration of the timing and dosing of opioids in relationship to nocturnal sleep may decrease depression and subsequently optimize pain management.

No significant financial relationships to disclose.

Sex-, stage- and tissue-specific regulation by a mosquito hexamerin promoter

A portion of the 5'-flanking region of the female-specific hexamerin gene, Hex-1.2, from the mosquito Ochlerotatus atropalpus was used to drive expression of the luciferase reporter gene in Drosophila melanogaster. The proximal 0.7 kb of 5'-flanking DNA were sufficient to partially repress reporter gene activity in males and to drive tissue- and stage-specific expression comparable with that of the endogenous O. atropalpus Hex-1.2 gene. The Drosophila doublesex transcription factor (DSX), expressed in Escherichia coli, bound putative DSX sites of the Hex-1.2 gene differentially in vitro. Blocking expression of the female isoform of the Doublesex transcription factor in transgenic female flies resulted in reduction of luciferase expression to levels comparable with those in males, suggesting that Doublesex could contribute to regulation of female-specific expression of the O. atropalpus Hex-1.2 gene.

Chlamydia trachomatis infection & female infertility

BACKGROUND & OBJECTIVES

Chlamydia trachomatis is a well recognized sexually transmitted pathogen. Besides its potential to produce genital tract infection, C. trachomatis is increasingly being associated with long-term complications like infertility. The present study was undertaken to assess the role of C. trachomatis in female infertility as such data are lacking.

METHODS

Women of primary and secondary infertility (n=110) and 30 healthy term pregnant women as control group were enrolled in the study. Detailed clinical history of each patient was recorded. Hysterosalpingography was performed in all patients. Endocervical swabs were collected for culture on cycloheximide treated McCoy cell line and for antigen detection by ELISA.

RESULTS

C. trachomatis was detected in 31 (28.1%) of the 110 infertile women while one (3.3%) in control group was positive for C. trachomatis (P<0.01). Cell culture alone identified 25 (22.72%) patients suffering from chlamydial infection while C. trachomatis antigen was detected by ELISA in 18 (16.37%) patients. The one control case was positive for Chlamydia antigen by ELISA and not by cell culture. Chlamydial positivity was seen in 20 of the 74 (27%) women with primary infertility and in 11 of the 36 (30.6%) with secondary infertility. Of the 58 asymptomatic women, 21(36.2%) had chlamydia infection while among the 52 symptomatic cases 10 (19.2%) were infected; 38 per cent women with chlamydial infection also had tubal occlusion.

INTERPRETATION & CONCLUSION

A significantly high rate of C. trachomatis infection was found in infertile women and more so in asymptomatic females and in secondary infertility cases. Lack of symptoms make clinical diagnosis of chlamydial infection difficult. Screening of infertile women for C. trachomatis is therefore recommended so far early therapeutic interventions.

Infection in a neonate caused by Pichia fabianii: importance of molecular identification

Pichiafabianii, an uncommon yeast species recovered from clinical specimens, was documented as the cause of an infection in a 5-week-old female twin delivered at 25 and 3/7 weeks. She developed respiratory distress syndrome and necrotizing enterocolitis. At the time of the infection, she was febrile, thrombocytopenic, and still was requiring minimal ventilatory support. Blood cultures drawn on two consecutive days were positive for a germ tube negative yeast. Phenotypic methods including carbohydrate fermentations and assimilations (API 20C AUX) did not identify the yeast. Sequencing of D1/D2 domain of the large subunit rDNA was performed in one laboratory and sequencing a subunit of D2 performed in a second laboratory identified the yeast as P. fabianii. The organism was susceptible in vitro to amphotericin B, fluconazole and 5-fluorocytosinc. The patient responded to amphotericin B and removal of her vascular catheter. This case illustrates that there are an increasing number of fungi that may be pathogenic. Phenotypic tests may fail to identify them, emphasizing the need for commercially available, molecular based assays for identification.

Filarial dance in a breast mass on colour Doppler imaging

Filarial dance in breast lesions is a very rare entity. It is difficult to show the characteristic vigorous movement of the adult worms on static images although pulse wave Doppler and colour power Doppler have been used. Filarial dance on colour Doppler imaging has not been reported earlier to the best of our knowledge.