JB-VOLUME 01 ISSUE 03 MAY 2013


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Volume 1 Issue 3, May 2013

Journal of Biology

ISSN

2052-0751

Publication Frequency

6 Issues per year

Pages

61-85

Publication History


Original Articles

Effect of Inoculums Level of Common Scab of Potato (Solanum tuberosum L.) Caused by Streptomyces scabies on Progeny Tubers

M.I. Tajul, M. Hossain, M.I. Hossain, K. Naher and T.K. Dey

Pages 61-65


Mechanism of Paraquat Action Shows Interference in Spermatogenesis and Epididymal Maturation of Sperm in Mice

K.H.M. Ashoka Deepananda and W.A.J.P. De Silva

Pages 66-76


Occurrence of Gastrointestinal Opportunistic Parasites in Immunocompromised Patients in Northern India

Ankur Kashyap, Mahendra Pal Singh, Madhu and Ujjala Ghoshal

Pages 77-80


Comparative Study of Xenentocleidus Tripathi et al (2007) with some Dactylogyrus sp., on the Basis of in-Silico Analysis

Nirupama Agrawal and Amrin Ali 

Pages 81-85



Title

Effect of Inoculums Level of Common Scab of Potato (Solanum tuberosum L.) Caused by Streptomyces scabies on Progeny Tubers

Abstract

Potato common scab, caused by Streptomyces scabies, is one of the most important diseases of potato worldwide. To identify the effect of inoculums levels of common scab on progeny tubers, field experiments were conducted at Bangladesh Agricultural Research Institute (BARI), Gazipur, Bangladesh using the infected seed tubers of variety ‘Diamant’. There were 6 inoculums levels (0, 5, 10, 20, 50 and 100%) of common scab used as infected tubers. The crop was grown during Rabi season (December-March). Data on percent foliage coverage, plant emergence, scabby tubers and tuber yield were collected and analyzed statistically. Results revealed that the effect of different inoculums level of common scab did not influence plant emergence significantly. Percent scabby tuber ranged 14.13-38.83 by weight. Substantially lowest (14.13%) scabby-tuber was recorded in the untreated-control and it was maximum (38.83%) in 100% inoculums level treatment. Regarding yield, although different treatments significantly influenced yield, there was no direct correlation with the percent inoculums level on yield of the potato. This study suggests that the inoculums from infected seed tubers can produce disease on progeny tubers the next season and inoculum on seed tubers, even those without visible lesions, seem to be important in the disease outbreaks.

Keywords

Infection, Pathogen, Plant Emergence, Scabby Tuber, Yield


Title

Mechanism of Paraquat Action Shows Interference in Spermatogenesis and Epididymal Maturation of Sperm in Mice

Abstract

Studies have shown mammalian spermatogenesis and sperm maturation processes are in danger from environmental pollutants but detailed mechanisms of such actions are rare. Paraquat is a broad-spectrum weedicide, potent free radical former and readily soluble in water. The present study aimed to investigate mechanism(s) of toxic effects of Paraquat on mice epididymal sperm. Mice (5 groups, n=10) were exposed with four concentrations i.e. 8(T1), 4(T2), 2(T3), 1(T4) mg/kg bodyweight of Paraquat and distilled water alone to control group, by way of inter-dermal exposure to scrotal sac for a week on the day other day and sacrificed on the day 14th. Testicular and epididymal sperm parameters were measured. DNA integrity of epididymal sperm and abnormalities were assessed using acridine orange staining. There was a marked increase in epididymal weight among treatment groups and significant (P<0.05) in T2. Testicular weights did not show changes indicating reduced effects on testicular endocrine milieu. However, testicular sperm count differed significantly (P<0.05) for treated groups T1, T2 and T3. Percentage fast moving, slow moving, twitching and immotile sperm in the epididymis were significantly reduced in all treated groups. DNA integrity test and abnormalities revealed marked damages to epididymal sperm. From the present study it is not exactly clear whether reduction in sperm number and sperm count were due to free radical formation by Paraquat. But present findings suggest whether sperm membrane damage in vivo make sperm storage vulnerable in mammalian epididymis.

Keywords

Paraquat, Spermatogenesis, Epididymial Sperm Maturation, Sperm Abnormalities, Mice


Title

Occurrence of Gastrointestinal Opportunistic Parasites in Immunocompromised Patients in Northern India

Abstract

Gastrointestinal infections are more common and more severe in immunocompromised individuals. This study was performed on immunocompromised patients namely those infected with HIV, transplants recipient and those with hematol-ogical malignancies. Work was carried out in the parasitological laboratory, Department of Microbiology, SGPGIMS, Lucknow from 1st February 2008 to 31st June 2008. We found that opportunistic parasitic infections were more common in immunocompromised patients. Most of the HIV patients were young and renal transplant patients were middle age, howev-er, males were found to be at higher risk. Cryptosporidium was the most common opportunistic pathogen followed by Microsporidia. Most of the infections were found in the patients with low CD4 count. Thus patients with low CD4 count must be screened for opportunistic infections.

Keywords

Immunocompromised, HIV, Cryptosporidium, CD4, Microsporidia


Title

Comparative Study of Xenentocleidus Tripathi et al (2007) with some Dactylogyrus sp., on the Basis of in-Silico Analysis

Abstract

Genus Xenentocleidus Tripathi et al, 2007 was established to accommodate Urocleidus Xenentodoni Jain, 1961, infecting Xenentodon cancilla (Hamilton) from River Sharda, Pilibhit and River Gomti, Lucknow under the family Dactylogyridae. 28S rDNA sequence of Xenentocleidus xenentodoni was amplified, sequenced and compared with seven sequences (all dactylogyrids) retrieved from NCBI (Gen Bank Accession Nos. EF100534.1, EF100535.1, EF100533.1, EF100536.1, FN391583.1, AJ969943.1, AY553629.1), using bioinformatic tools. Genus Xenentocleidus taken as query was found to be homologous to the seven members of Dactylogyridae as established from the phylogenetic analysis.

Keywords

Xenentocleidus xenentodoni, rDNA Sequence, In-Silico Analysis, Dactylogyridae