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  • Springer  (38)
  • 1975-1979  (38)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 32 (1976), S. 572-573 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Electrolysis of salt solutions produces mortality of a plant-parasitic nematodeMeloidogyne incognita. The mortality depends on the nature and amount of the, products of electrochemical reactions and is enhanced in presence of Cu-electrodes. Application of magnetic fields on electric fields alters nematode mortality in ferro-magnetic electrolytes.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 32 (1976), S. 673-674 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The use of formaldehyde-Schiff's reagent as a nucleolar stain has been described. Using different digestion procedures, it was confirmed that the stain is specific for RNA. It can be suitably used as a nucleolar stain, particularly in plant materials after a short TCA extraction, which probably extracts the nonbound RNA.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 34 (1978), S. 348-350 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary InHibiscus cannabinus a negative association exists between the foliar spirality and the aestivation of corolla. Moreover, it is seen that the fruits developed from left-twiting flowers of left-spiralled plants and those of the right-twisting flowers of right-spiralled plants are better in quality.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Chromosoma 65 (1978), S. 293-300 
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A high degree of mitotic asynchrony is reported for spontaneously arising multinucleate cells of HeLa and Pt-K1, tissue culture cell lines. Neither nuclear number, nor nuclear size nor the presence or absence of nucleoli, could be directly related to the asynchronous behaviour of the cells. Suboptimal levels of nutrients led to a higher frequency of asynchrony. A partial compartmentation of the cytoplasm could be detected in some of the multinucleate cells. The compartmentation of the cytoplasm may lead to an uneven distribution of inducer and non-inducer metabolites. All these factors together may be responsible for the high degree of mitotic asynchrony.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 24 (1976), S. 227-233 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Contributions to the spin-lattice relaxation time (T 1) and the spin-spin relaxation time (T 2) due to critical fluctuations (CF) have been determined in para-azoxyanisole (PAA) from the corresponding proton relaxation times measured at 60 MHz over a temperature range of about 35 °K above the nematic-isotropic transition temperatureT C .In determining the CF contributions, the procedure followed here is the same as the present authors used earlier for a similar study in p-methoxybenzylidene p-n butylaniline (MBBA). Like that in MBBA at 14 MHz, a maximum in the CF contribution toT 1, has been observed. Following a recent theory we identify this contribution toT 1 arising from the “nonlocal” part of CF, and we call thisT 1)CFN. The correlation time associated with this “nonlocal” part of CF,τ CFN, has been determined at different temperatures fromT 1)CFN. The temperature dependence ofτ CFN is in good agreement with the Landau-de Gennes theory and is consistent with that observed earlier in MBBA. The temperature dependence ofT 2)CF is also in reasonable agreement with the above behavior ofτ CFN. However, ourT 2)CF data can also be fitted to a temperature dependence expected from a contribution toT 2)CF arising from the “local” part of CF, such a fitting is comparatively poorer than the former. Since ourT 2)CF data are neither sufficiently accurate nor elaborate, no attempt has been made here to separate these two contributions, “nonlocal” and “local” parts of CF, which have been predicted from theoretical considerations. A behavior similar to that of ourT 2)CF is also shown by the earlier data of Cabane and Clark obtained from14N resonance when their data are processed properly.
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  • 6
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Results of spectrophotometric, conductometric and dialysis studies on the interaction of acridine orange monohydrochloride dye with sodiumdodecylsulfate (anionic), cetyltrimethylammoniumbromide (cationic) and Triton X 100 (nonionic) surfactants have been reported. The anionic surfactant, SDS has been observed to undergo both electrostatic and hydrophobic interactions with the dye cation. Aggregation of the dye molecules can be destroyed when the surfactant is in large excess, whereas, excess dye can check micellization of SD S. At a ratio of AO:SDS=1:7 and above, dye embedded mixed micelles are formed. These remain in a separate phase, probably as coacervates. At lower ratios than 1:7, aggregation of dye molecules is induced, which being complexed with SDS become stabilized as colloids. The colloid and the coacervate have been observed to be thermally stable, negatively charged materials that can be broken by salts, and cations of higher valency are more effective in this regard. An 1:3 = AO:SDS colloid has beeen found to be sufficiently large like the coacervates to pass through a membrane having cut off permeability for molecular weights 12,000 and above. All the above features of AO-SDS interaction have been observed to be absent for AO-CTAB and AO-TX 100 systems, Even hydrophobic interaction has played an insignificant role in these cases. Thus, the dye cation, the cationic and the nonionic surfactants have almost retained their self physicochemical identities in solution in the presence of each other. Electrostatic interaction is thus the primary requirement for acridine orange-surfactant (anionic) system; the hydrophobic effect is secondary and may become co-operative.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 33 (1977), S. 432-433 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Orientation of Giemsa C-bands in Allium cepa was studied in both mitotic and interphase cells. It has been shown that telophase orientation of the chromosome is maintained throughout the interphase and early prophase. It has been assumed that this non-random orientation is due to anchorage of the telomeres with the nuclear membrane. Contrary to earlier observations, 2 by 2 pairing of the telomeres could not be traced in this species.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 27 (1977), S. 430-434 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The object of the present paper is to study the MHD effects on the laminar flow of a viscous, incompressible and conducting fluid in an annulus with arbitrary time-varying pressure gradient and arbitrary initial velocity in presence of a radial magnetic field. Using finite Hankel transform, solutions for both the unsteady and steady flows under different prescribed pressure gradients have been found out.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 27 (1977), S. 158-166 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An attempt has been made here to study the MHD effects on the slow motion of a viscous, incompressible and conducting fluid between two parallel porous infinite plane walls in presence of a transverse magnetic field varying periodically with time. The problem has been investigated firstly for the case of non-conducting walls and finally for the case of conducting walls.
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  • 10
    ISSN: 1573-5117
    Keywords: Manure ; inorganic fertilizers ; salinity range ; plankton production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Augmentation of plankton production in Indian fishponds by application of manure and inorganic fertilisers was studied in laboratory experiments. The effects of the salinity of the medium were also examined. Laboratory trials were made with mustard oil cake and urea on equivalent nutrient bases in media with varying degrees of salinity (0–30 ppt at 2 ppt. intervals). It was observed that Closterium, Fragilaria, Pinnularia and Gyrosigma grew well in the higher salinity range between 24 to 30 ppt. whereas lower salinities ranging from a trace to 8 ppt. are suitable for improved production of Anabaena, Synedra, Navicula, Amphipleura, Amphora and Nitzschia. Comparatively better production of plankton was recorded with urea than with mustard oil cake.
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