• Volume 75, Issue 6

      June 1972,   pages  257-302

    • Histomorphological studies on the neurosecretory system of three genera of freshwater teleostean fishes

      K Chandrasekhar D Khosa

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      The pre-optic nucleus ofClarias batrachus is club-shaped and that ofHeteropneustis fossilis is spindle-shaped and the neurons in both take on a brilliant hue with aldehyde fuchsin stain. On the other hand, the nuclei are bizarre with diffuse neurons inOphiocephalus punctatus. The pre-optic nuclei themselves are located anterior to the emergence of the optic nerve inO. punctatus while in the other two fishes they occupy positions posterior to it. A single neuron on the dorso-lateral aspect of the spindle inH. fossilis distorts its regular shape.

      The hypothalamo-hypophysial tract inC. batrachus andH. fossilis have an anterior bend and mingle with the optic nerve fibres before coursing caudad while inO. punctatus it takes on a straight posterior course. The distal parts of the tract inC. batrachus andH. fossilis pass through the middle of the adeno-hypophysis while inO. punctatus it lies bordering the infundibular recess giving off fuchsionphil haemofibres which mingle with capillary network and have a parallel course in between the cells of pars-distalis, thus making it resemble the ‘Median Eminence’ of higher vertebrates.

    • The hypotonic fragility of some fish erythrocytes

      Saghir H Khan A Qayyum Siddiqui Absarul Hasnain

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      Osmotic fragilities of red blood cells of three freshwater fish species,Ophicephalus punctatus (Bloch),O. striatus (Bloch), andClarias batrachus (L.) were studied under standard conditions in hypotonic solutions of sodium chloride. The fragility curves of the fishes were found to be of normal sigmoid type similar to those of marine fishes and mammalian erythrocytes. The differences between the mean corpuscular fragility (MCF) values among the species investigated were found to be statistically significant, while the standard deviations at H50 (50% haemolysis) showed that the MCF values remained consistent with in the species.

      The increment haemolysis curves for the above three species were found to be of monophasic type which showed uniform population of red blood cells.

    • Morphological studies in the family convolvulaceae - IV. Vascular anatomy of the flower

      C M Govil

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      The present investigation embodies the results of a study of 29 species belonging to nine genera. The course of the vascular supply of the flower is more or less on the same pattern in all members. The sepal receives three traces except inPorana paniculata where it is unitraced. The lateral traces are initially fused with the petal traces. InEvolvulus alsinoides the lateral traces arise independent of the petal traces. The petal and stamen are uniformly single-traced organs. The traces for the disc arise simultaneously with the stamen and carpel traces. The disc where present is receptacular as evidenced by its vasculature. The ovary is bi or tricarpellary and each carpel receives three traces. The ventral bundles in species ofIpomoea, Argyreia, Merremia, Rivea, andConvolvulus fuse in pairs and then give off two branches each to the two ovules of the two sides while inCressa, Porana, Evolvulus andJacquemontia they directly furnish the ovular supply without being fused. The placentation in the family has been interpreted as parietal.

    • The influence of fimbriation on the infectivity ofSalmonella typhimurium

      M R Darekar J P Duguid

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      1184 mice were challenged by the oral, conjunctival or intraperitoneal route with bacteria belonging to a fimbriate (1566 F) or a non-fimbriate strain (1566 N) ofS. typhimurium.

      The differences in the rates of infections and deaths between the different methods of inoculation were highly significant.

      Whatever the route of infection the fimbriate strain is more liable to produce persistent long-lasting infections that may result in late deaths.

    • Free sugars in the reproductive system and haemolymph of the bedbug

      Hari V Rao

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      Using chromatographic procedures, two free sugars glucose and trehalose have been detected in the reproductive tissues and the haemolymph ofCimex. The seminal fluid and not the sperm has been found to possess trehalase activity. A novel feature of the metabolism of the active sperm is enzymic hydrolysis of trehalose, followed by oxidative utilisation of the hexose thus formed. The process is termed here “trehalolysis”. The depletion of the sugars has been demonstrated semiquantitatively by paper chromatography.

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