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Biomedical subjects

A Jha

Publications and source records attributed to A Jha.

At least 19 recordsLinked to original sources
PubMed2006

Dietary microbial levan enhances cellular non-specific immunity and survival of common carp (Cyprinus carpio) juveniles.

A preliminary study with a 75days feeding trial was conducted to study the immunomodulatory effect of microbial levan on Cyprinus carpio juveniles. Five purified isonitrogenous and isocaloric diets with graded levels of levan, namely (T(1)) 0.1% levan, (T(2)) 0.2% levan, (T(3)) 0.5% levan, (T(4)) 1.0% levan, and a control group without levan were fed to five groups of fishes in triplicate. The total erythrocyte count and haemoglobin content was significantly (p<0.05) enhanced in the T(3) group, though the total leucocyte counts, total protein and A/G ratio did not show any significant difference (p>0.05) when compared with the control group. The respiratory burst activity (NBT) of blood phagocytes and lysozyme activity was also highest in T(3) group. The relative survival percentage after challenge with Aeromonas hydrophila was highest (100%) in the T(3) group followed by 83.33% and 66.67% in the T(2) and T(4) groups, respectively. This suggests that microbial levan at 0.5% can be used as a dietary immunostimulant for C. carpio juveniles. This is the first report on microbial levan having an immunomodulatory effect on C. carpio.

Adjuvants, Immunologic↗
PubMed2006

1-N-(Arylmaleamoyl)-3,5-bis(phenylmethylene)4-piperidones: a novel class of antimycobacterial agents.

Various acyl groups possessing markedly divergent topography were placed on the nitrogen atom of the antimycobacterial agent 3,5-bis(phenylmethylene)-4-piperidone (1). Some of the N-maleamoyl analogues of 1 displayed antitubercular properties thereby affording an insight into the structural requirements for interactions at a putative auxiliary binding site in the bacterium.

Antitubercular Agents↗
PubMed2003

3,5-bis(phenylmethylene)-1-(N-arylmaleamoyl)-4-piperidones: a novel group of cytotoxic agents.

A series of novel 3,5-bis(phenylmethylene)-1-(N-arylmaleamoyl)-4-piperidones 3 have been synthesized which displayed potent cytotoxicity towards human Molt 4/C8 and CEM T-lymphocytes as well as murine P388 and L1210 leukemic cells. In contrast, the related N-arylmaleamic acids 4 possessed little or no cytotoxicity in these four screens. Molecular modeling revealed certain interplanar and bond angles and interatomic distances which were perceived to contribute to the observed bioactivity as well as providing suggestions for future structural modifications of the piperidones 3. Evaluation of representative compounds in series 3 and 4 on the activity of human N-myristoyltransferase revealed that, at the maximum concentration utilized, namely 250 microM, only weak inhibiting properties were displayed by some of the compounds in series 4. Various members of series 3 and 4 were well tolerated in mice.

Animals↗
PubMed2003

Cytotoxic 4'-aminochalcones and related compounds.

A series of 4'-aminochalcones 1 and related maleamic acids 2 and Schiff bases 3 were designed and synthesized as candidate cytotoxic agents. The atomic charges on different atoms of representative compounds were calculated. Evaluation of the enones 1-3 against human Molt 4/C8 and CEM T-lymphocytes as well as murine P388 and L1210 leukemic cells revealed that approximately 40% of the IC50 values generated were less than 10 microM. In some cases cytotoxicity was correlated with the Hammett sigma values of the aryl substituents and less frequently with the aryl Hansch pi values. Evidence was obtained that in general these compounds displayed selective toxicity for certain malignant cells and were well tolerated in mice. This study has revealed various directions whereby the project may be amplified in the future with a view to finding compounds with increased cytotoxicity to tumour cells.

Animals↗
PubMed2001

To tell or not to tell-comparison of older patients' reaction to their diagnosis of dementia and depression.

OBJECTIVE: Investigation of the reaction of elderly patients to the disclosure of their diagnosis of dementia compared with depression. DESIGN: Elderly patients suffering from dementia and depression were asked to complete a questionnaire about the diagnosis and other aspects of their clinical summary sent to them by post. Demographic data included age, gender, marital status and occupation; degree of dementia or depression was established by administering the mini-mental state examination and the geriatric depression scale, respectively. SETTING: Patients were consecutive attendees of outpatient clinics (old age psychiatry) located in two suburban areas near London. MEASURES: Demographic data included age, gender, marital status and occupation; degree of dementia or depression was established by administering the mini-mental state examination and the geriatric depression scale, respectively. RESULTS: One hundred cases were recruited, 53 with dementia and 47 with depression. Most depressed and dementia patients ( > 75%) liked the idea of reading their diagnosis but 25% of dementia cases felt upset. Within the dementia group, the majority of patients with mild or severe dementia welcomed the idea of knowing their diagnosis; and 13 (100%) of the patients with vascular dementia wished to know (compared with 68% cases with Alzheimer's disease). None felt upset, and only 39% of them felt pessimistic after reading their own clinical summary. However, among dementia patients who also happened to be depressed, a higher proportion (60%) expressed an unfavourable view towards knowing their diagnosis, but only a minority (40%) of them were actually upset. Most older married females, especially those with depression and Alzheimer's disease, felt pessimistic afterwards. CONCLUSIONS: There was no significant difference between patients with dementia or depression in their wish to know their diagnosis. Patients with severe dementia, even if they felt upset, preferred to be told their diagnosis. Patients with vascular dementia tended to express a more favourable view.

Aged↗