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Biomedical subjects

J Mohan

Publications and source records attributed to J Mohan.

At least 55 records · Page 3Linked to original sources
PubMed1976

Malignant spread of haemangioblastoma: report on two cases.

Two cases are described in which, after successful removal of a cerebellar haemangioblastoma followed by several years of freedom from symptoms, there developed a progressive spinal cord compression, leading to death. At necropsy the spinal cords in both cases and the brainstem in one case, were irregularly plastered with haemangioblastoma. Although there was no doubt that malignant spread had occurred from one or more primary tumours, the histology of the tumour tissue was in no way different from that of conventional haemangioblastoma.

Adenoma↗
PubMed1976

Evidence for the presence of a vasoactive substance (possibly involved in the aetiology of cerebral arterial spasm) in cerebrospinal fluid from patients with subarachnoid haemorrhage.

Cerebrospinal fluid from patients with subarachnoid haemorrhage and cerebral arterial spasm contracted the isolated basilar artery and potentiated contractions produced by 5-hydroxytryptamine, noradrenaline, and six prostaglandins. The unidentified substance in cerebrospinal fluid probably plays a role in the aetiology of cerebral arterial spasm.

Adolescent↗
PubMed1975

The synthesis of 5S RNA and its relationship to 18S and 28S ribosomal RNA in the bobbed mutants of Drosophila melanogaster.

Ribosomes contain one molecule each of 5S, 18S and 28S RNA. In Drosophila melanogaster although the genes for 18S + 28S are physically separated from the 5S RNA genes, the multiplicity of various ribosomal RNA genes is roughly the same. Thus a coordinate synthesis of these three molecules might seem feasible. This problem has been approached by determining the molar ratios of various RNA's in ovaries and in adult flies. In ovaries there is a slight excess of 5S RNA molecules over other rRNA's, but in adult flies no such differences exist. Bobbed mutants also have the same molar ratios as wild-type flies. Results on 5S RNA synthesis in both in vitro and in vivo studies show that it is reduced in coordination with 18S + 28S rRNA in the bobbed mutants of Drosophila melanogaster. Various possibilities are discussed in considering the implications of these results.

DNA↗
PubMed1975

Pupillary constriction and ptosis following caudal epidural analgesia.

This study reports pupillary changes occurring in seventeen of twenty pregnant women at term who received caudal analgesia for the relief of pain in the first and second stages of labour. It is suggested that 10 ml or more of analgesic solution, injected into the sacral epidural space, reaches high enough (probably to T1) to cause meiosis and/or ptosis.

Anesthesia, Caudal↗
PubMed1975

Indian students' perceptions of the ideal self, the ideal leader, the ideal teacher, Indira Gandhi and the business executive.

The Activity Vector Analysis (AVA) was administered to three samples drawn from a population of graduate students at an Indian university. Results indicated a high positive relationship among the perceptions of the ideal self, ideal teacher, and ideal leader. Likewise, the consensual profile of Indira Gandhi was found to be quite similar to the ideal self cluster (r = .96). The collective perception of the business executive, however, was only remotely similar to the other two character profiles.

Adolescent↗
PubMed1974

Ribosomal RNA cistron multiplicity and nucleolar organizers in hexaploid wheat.

The ribosomal DNA (DNA complementary to ribosomal RNA) content of twelve different wheat genotypes has been studied. Some of these genotypes are aneuploids with deletions or additions of chromosomes bearing nucleolar organisers. The rDNA contents of these genotypes provide several examples of a clear departure from a correlation between the number of rRNA cistrons and the number of nucleolar organisers. Thus the number of rRNA cistrons per nucleolar organiser is not constant in wheat. Wheat DNA was found to have a mean buoyant density of approximately 1.702 g/cc for all genotypes studied and rRNA hybridized selectively to DNA of buoyant density approximately 1.710 g/cc. The thermal stabilities of all the rRNA/DNA hybrids were essentially identical.

Cell Nucleolus↗