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P N Shah

Publications and source records attributed to P N Shah.

At least 19 recordsLinked to original sources
PubMed2003

A tool-kit for cDNA microarray and promoter analysis.

We describe two sets of programs for expediting routine tasks in analysis of cDNA microarray data and promoter sequences. The first set permits bad data points to be flagged with respect to a number of parameters and performs normalization in three different ways. It allows combining of result files into comprehensive data sets, evaluation of the quality of both technical and biological replicates and row and/or column standardization of data matrices. The second set supports mapping ESTs in the genome, identifying the corresponding genes and recovering their promoters, analyzing promoters for transcription factor binding sites, and visual representation of the results. The programs are designed primarily for Arabidopsis thaliana researchers, but can be adapted readily for other model systems. Availability and Supplementary information: http://www.personal.psu.edu/nhs109/Programs/

Algorithms↗
PubMed1997

Managing geriatric syndromes: what geriatric assessment teams recommend, what primary care physicians implement, what patients adhere to.

OBJECTIVES: To evaluate the responses of primary care physicians and patients to recommendations from a community-based comprehensive geriatric assessment (CGA) program for management of four target conditions: falls, depression, urinary incontinence, and functional impairment. DESIGN: Case series. SETTING: Senior centers, meal sites, senior housing, and other community sites as screening locations; and a community-bases academic practice as the location for CGA. PARTICIPANTS: A total of 150 older patients living in the community who have one or more of the four target conditions and who received CGA. MEASUREMENTS: Physician implementation and patient adherence rates were ascertained during a face-to-face structured interview with the patient 3 months after CGA. RESULTS: Two hundred twelve of 528 (40%) CGA recommendations were clearly or possible related to the target or target-related conditions. Of these 212 recommendations, 59% required a physician's order for implementation. The remaining 41% were patient self-care recommendations. Overall physician implementation across conditions was 70%; implementation rates were highest for falls and lowest for functional impairment. Overall patient adherence rate was 85% for physician-implemented recommendations and 46% for self-care recommendations. Patient adherence to recommendations for counseling or support groups and exercise programs was particularly low. CONCLUSIONS: When examining the process of care of community-based CGA, patient as well as physician adherence must be considered. Although patient adherence to physician-initiated recommendations was high for all conditions, it varied substantially across target conditions and types of recommendations for self-care recommendations.

Accidental Falls↗
PubMed1994

Menstrual symptoms in women infected by the human immunodeficiency virus.

OBJECTIVE: To determine whether there is a higher prevalence of menstrual symptoms in women seropositive for the human immunodeficiency virus (HIV) compared to a matched control group and to examine the relation between menstrual symptomatology and immunosuppression. METHODS: In a cross-sectional study, 55 HIV-seropositive women and a matched control group underwent detailed gynecologic assessment. The prevalence of regular cycles, oligomenorrhea, amenorrhea, menorrhagia, dysmenorrhea, and dyspareunia was assessed in the two groups. Any association with clinical disease or CD4 lymphocyte count was sought. RESULTS: There were no significant differences in the prevalence of oligomenorrhea, amenorrhea, menorrhagia, dysmenorrhea, or dyspareunia between the groups. Furthermore, no differences were demonstrated between symptomatic and asymptomatic women infected by HIV, nor was any correlation found between CD4 lymphocyte count and menstrual loss or dysmenorrhea. CONCLUSION: Infection with HIV and related immunosuppression do not seem to have a clinically significant effect on menstruation.

Adult↗
PubMed1993

Women with HIV presenting at three London clinics between 1985-1992.

OBJECTIVE: To determine the changing patterns of HIV infection in women in three units in London. SUBJECTS: Three hundred and fifty seven HIV seropositive women who have attended outpatient clinics between 1984 and 1992. METHODS: A retrospective review of data obtained from a computerised database and supplemented by direct inspection of the notes. RESULTS: The number of newly identified women with HIV has risen steadily over the period of study with a significant shift towards a heterosexual mode of transmission. This is a reflection of increasing numbers of women from Sub-Saharan Africa rather than a rise in the incidence of HIV in women born in the UK. CONCLUSIONS: The increase in women infected by HIV remains predominantly restricted to women in "high risk" groups. Although encouraging, our data should be interpreted with caution since it suffers from the inherent bias of selective testing. Safer sex education and epidemiological surveillance should continue despite the apparent low risk to women born in the UK.

Africa South of the Sahara↗
PubMed1984

Pineal ablation in varying photoperiods and the incidence of 9,10-dimethyl-1,2-benzanthracene induced mammary cancer in rats.

Our earlier observation of increased incidence of 9,10-dimethyl-1,2-benzanthracene (DMBA) induced mammary carcinoma in young, virgin 'functionally' pinealectomized Holtzman rats poses the question whether or not a comparable incidence would occur in surgically pinealectomized rats reared in varying photoperiods (e.g. light/dark (LD) 24/0 or LD 10/14 schedules). Results show that functionally or surgically pinealectomized rats in LD 24/0 schedule have comparable mammary tumor incidence (95% and 83%, respectively) and latency period of tumor appearance (60 +/- 3.1 and 69.2 +/- 6.6 days, respectively). However, when surgically pinealectomized rats were kept in short photoperiods (LD 10/14), a significant difference was observed in both tumor incidence (60.9%) and latency period (91.8 +/- 11.0 days). Our data suggest that the susceptibility of the mammary gland to carcinogenic insult may be modulated by the concentration of the pineal hormone, melatonin, in the CNS.

9,10-Dimethyl-1,2-benzanthracene↗
PubMed1984

Effect of varying photoperiods on mammary morphology, DNA synthesis, and hormone profile in female rats.

A clear positive correlation between circulating levels of prolactin (Prl) and morphologic development as well as DNA synthetic index in the mammary gland was established in young virgin Holtzman rats exposed to constant light from birth. The observed elevated level of circulating Prl by virtue of its morphogenic and mitogenic properties induced changes in mammary epithelium [numerous actively differentiating terminal end buds into alveolar buds (AB)] highly susceptible for the action of 7,12-dimethylbenz[a]anthracene [(DMBA) CAS: 57-97-6]. Conversely, substitution treatment with melatonin in such a model caused a significant decrease in both Prl and 17 beta-estradiol (E2) levels as well as in the morphologic and DNA synthetic pattern of the mammary gland. Administration of 2-bromo-alpha- ergocryptin in these animals caused a significant decrease in the plasma level of Prl (without affecting the level of E2) and a decrease in the density of AB and in DNA synthesis. These changes impaired the mammary gland responsiveness to DMBA as seen from the significant decrease in the incidence of mammary carcinoma.

9,10-Dimethyl-1,2-benzanthracene↗
PubMed1984

Effect of melatonin on mammary carcinogenesis in intact and pinealectomized rats in varying photoperiods.

Exposure of female Holtzman rats to constant light (24 hr/day) immediately after birth significantly increased 9, 10-dimethyl-1,2-benzanthracene-induced mammary cancer. Such "functionally pinealectomized" animals also revealed significant increase in the circulating level of prolactin and exaggerated development and proliferative activity of mammary epithelium, as measured by quantitation of terminal end buds and alveolar buds from the whole mounts and by DNA synthesis, respectively. Administration of melatonin (500 micrograms/day/rat i.p. given from 52 to 145 days of age) completely abolished the effect of functional pinealectomy by sharply reducing 9, 10-dimethyl-1,2-benzanthracene-induced cancer incidence from 95% to 25% during the post-9, 10-dimethyl-1,2-benzanthracene observation period which lasted up to 180 days. On the other hand, administration of melatonin to surgically pinealectomized animals exposed to constant light reversed the effect only partially by reducing the cancer incidence from 83% to 53%. Further, melatonin treatment in intact and surgically pinealectomized animals exposed to a short photoperiod revealed qualitatively similar differences in suppression of the cancer incidence. From these results, it is concluded that, to have an impressive antitumor effect, presence of the pineal gland is essential, and the probable site of melatonin action appears to be at both the pineal gland and the hypothalamus.

9,10-Dimethyl-1,2-benzanthracene↗
PubMed1983

Peroxidase activity (PA) and progesterone receptors (PgR) in normal rat mammary glands.

PA and PgR appear to be reliable markers of estradiol action in normal female rat mammary glands, as seen by simultaneous expression of both proteins between the ages of 61 and 131 days. However, expression of PA at certain periods, when PgR was undetectable suggests, that the extent of availability of both estradiol and progesterone at target sites may act as controlling factors in synthesis of one protein over another.

Aging↗
PubMed1982

Effect of continuous light on the incidence of 9,10-dimethyl-1,2-benzanthracene induced mammary tumors in female Holtzman rats.

The pineal has been recently implicated in mammary tumorigenesis. Effect of physiological pinealectomy brought about by subjecting female Holtzman rats to permanent lighting (24 h/day) from birth was studied on the incidence of 9,10-dimethyl-1,2-benzanthracene (DMBA) induced mammary tumors. The incidence of adenocarcinoma was 95% in animals maintained in continuous photoperiod in contrast to that (60%) observed in control animals maintained on a light/dark (10/14 h) schedule. Further, the latency period of tumor appearance (61.5 +/- 9 days) in the former group was found to be significantly shorter than that seen in the latter group (93.7 +/- 8.3 days). Explanations are offered for this difference in the observed incidence.

9,10-Dimethyl-1,2-benzanthracene↗