| indole-3-acetic acid (iaa) production by arthrobacter species isolated from azolla. | arthrobacter species, isolated from the leaf cavities and the microsporocarps of the aquatic fern species azolla pinnata and azolla filiculoides, produced indole-3-acetic acid (iaa) in culture when the precursor tryptophan was added to the medium. no iaa production was detected in the absence of tryptophan. maximum iaa formation was obtained in the first 2 d of incubation. part of the tryptophan was transformed to n alpha-acetyl-l-tryptophan. | 1992 | 1564446 |
| role of azolla in controlling mosquito breeding in ghaziabad district villages (u.p.). | a survey was carried out during post-monsoon period (1988-89) in villages of dhaulana primary health centre, distt. ghaziabad (u.p.) to evaluate the utility of azolla pinnata for the control of mosquito breeding in different habitats. results of the survey revealed that pools, ponds, wells, rice fields and drains were infested with azolla. infestation rate and intensity of infestation varied from habitat to habitat. maximum infestation (36.5%) was observed in pools and minimum (3.7%) in rice fie ... | 1991 | 1680758 |
| identification of a common cyanobacterial symbiont associated with azolla spp. through molecular and morphological characterization of free-living and symbiotic cyanobacteria. | symbiotically associated cyanobacteria from azolla mexicana and azolla pinnata were isolated and cultured in a free-living state. morphological analyses revealed differences between the free-living isolates and their symbiotic counterparts, as did restriction fragment length polymorphism (rflp) analyses with both single-copy glna and rbcs gene probes and a multicopy psba gene probe. rflp analyses with anabaena sp. strain pcc 7120 nifd excision element probes, including an xisa gene probe, detect ... | 1991 | 1685078 |
| role of certain environmental factors on cadmium uptake and toxicity in spirodela polyrhiza (l.) schleid. and azolla pinnata r. br. | effects of ph, temperature, edta and photosynthetically available radiation on the uptake and toxicity of cd was investigated in spirodela polyrhiza (l.) schleid. and azolla pinnata r. br. in general, cd toxicity was accentuated in conditions which favoured enhanced intracellular cd uptake. extracellular binding and intracellular uptake of cd were lowered at ph values > 7 due to reduced availability of the aquo ion; consequently, toxicity was markedly reduced. at ph value < 7, extracellular bind ... | 1995 | 8561919 |
| susceptibility of biomphalaria alexandrina to the plant azolla pinnata and some herbicides in relation to infection with schistosoma mansoni miracidia. | molluscicidal activity of the herebicides 2,4-d and graminol, as well as both extracts and dry powder of the plant azolla pinnata were evaluated against b. alexandrina snails. it was observed that 2,4-d proved to be the most toxic compound among he tested ones, showing lc90 of 52 ppm after 24 h of exposure. ethanol extract of azolla showed the highest molluscicidal activity against the tested snails compared with the other extracts and dry powder (lc90 = 3300 ppm). ethanol extract at 6600 ppm af ... | 1998 | 9617046 |
| evaluation of different means of control of snail intermediate host of schistosoma mansoni. | four water courses having the same conditions and snail density were chosen for this study. all methods were applied simultaneously in april. snails were collected monthly to evaluate the malacological effect. a single application of 100 ppm dried a. maritima decreased the snail density significantly within one month. snail density was maintained very low until the end of the year. fresh azolla pinnata applied in a dose of 280 ppm lowered snail density to a level intermediate between ambrosia ma ... | 2000 | 10946506 |
| [features of cyanobacterial-bacterial complexes of microsymbionts of plant syncyanoses]. | the morphology and ultrastructure of associative microsymbiont complexes (amc) isolated from the ferns azolla pinnata and azolla sp. and the apogeotropic roots of the cycad cycas revoluta were studied. the composition of the amc obtained includes the cyanobionts (symbiotic cyanobacteria) and satellite bacteria (sb). it was found that two types of cyanobacteria that substantially differ in their morphological organization are likely present as cyanobionts in the coralloids of c. revoluta. the iso ... | 2001 | 11338829 |
| [characteristics of infection of plants and their cultured tissue with cyanobacterial-bacterial symbiotic associations]. | the infection of tobacco, nightshade, rice plants, and their tissue cultures with the cyanobacteria-bacteria symbiotic associations (cbsa) isolated from natural syncyanoses (the ferns azolla pinnata and azolla sp. and the cycad encephalartos ferox) was studied. the inoculation of the intact plants or their cuttings with cbsa led to the colonization of the plant roots, stems, and leaves by cyanobacteria and their bacterial symbionts (referred to as satellite bacteria, sb). the sites of the long-t ... | 2001 | 11450457 |
| synergistic effect of deoxyanthocyanins from symbiotic fern azolla spp. on hrma gene induction in the cyanobacterium nostoc punctiforme. | the hrma gene of the n2-fixing cyanobacterium nostoc punctiforme functions in repressing the formation of transitory motile filaments, termed hormogonia, by plant-associated vegetative filaments. here, we report that anthocyanins can contribute to induction of hrma expression. aqueous extract from fronds of the fern azolla pinnata, a host of symbiotic nostoc spp., was found to be a potent inducer of hrma-luxab in n. punctiforme strain ucd 328. the hrma-luxab inducing activities of a. pinnata, as ... | 2002 | 12236594 |
| biodegradation of diesel fuel by an azolla-derived bacterial consortium. | the widely distributed water fern azolla was investigated for use as an amendment in the bioremediation of fuel-contaminated environments. in a field experiment azolla pinnata as well as pistia stratiotes and salvinia molesta were applied to plots containing soil that had been surface-contaminated with diesel fuel (2.4 l m(-2)) and flooded with water. the plants quickly died and bacterial flocs developed around the dead a. pinnata fronds. after 16 weeks, diesel concentrations (as determined by l ... | 2002 | 12403010 |
| involvement of nitric oxide synthase in sucrose-enhanced hydrogen peroxide tolerance of rhodococcus sp. strain apg1, a plant-colonizing bacterium. | hydrogen peroxide (h2o2) tolerance of rhodococcus sp. strain apg1, previously isolated from the aquatic fern azolla pinnata, was examined in relation to nitric oxide (no) production by cells cultured on a variety of c sources. cells inoculated onto a. pinnata fronds established a surface-sterilant resistant density of 2-4x10(7) cells g(-1) without causing disease. compared to cultures containing glucose, fructose, mannitol, or glycerol, those provided only with sucrose displayed, on a per c basi ... | 2003 | 14559426 |
| dna probes show genetic variation in cyanobacterial symbionts of the azolla fern and a closer relationship to free-living nostoc strains than to free-living anabaena strains. | twenty-two isolates of anabaena azollae derived from seven azolla species from various geographic and ecological sources were characterized by dna-dna hybridization. cloned dna fragments derived from the genomic sequences of three different a. azollae isolates were used to detect restriction fragment length polymorphism among all symbiotic anabaenas. dna clones were radiolabeled and hybridized against southern blot transfers of genomic dnas of different isolates of a. azollae digested with restr ... | 1990 | 16348182 |
| observations on anopheline breeding in relation to aquatic plants in different breeding habitats of kheda (gujarat). | water bodies infested with aquatic vegetations may pose problems in mosquito control through bio-environmental methods. paucity of information pertaining to association of mosquito breeding with aquatic vegetation was the basis for present investigation. the mosquito breeding sites infested with solitary/dominating plant community viz., eichhornia crassipes, ipomoea aquatica, hydrilla verticillata, nymphea neuchali, trapa bispinosa, lemna paucicostata, trachelomonas spp., azolla pinnata, algae s ... | 2004 | 16509256 |
| the azolla-anabaena azollae relationship : xii. nitrogenase activity and phycobiliproteins of the endophyte as a function of leaf age and cell type. | nitrogenase activity was measured in leaves along the main stem axes of azolla pinnata r. br. the activity was negligible in leaves of the apical region, rapidly increased to a maximum as leaves matured, and declined in aging leaves. in situ absorption and fluorescence emission spectra were obtained for individual vegetative cells and heterocysts in filaments of the a. pinnata and azolla caroliniana endophytes removed from the cavities of progressively older leaves. these spectra unequivocally d ... | 1986 | 16664736 |
| growth and cellular ion content of a salt-sensitive symbiotic system azolla pinnata-anabaena azollae under nacl stress. | salinity, at a concentration of 10 mm nacl affected the growth of azolla pinnata-anabaena azollae association and became lethal at 40 mm. plants exposed up to 30 mm nacl exhibited longer roots than the control, especially during the beginning of incubation. average root number in plants exposed to 10 and 20 mm nacl remained almost the same as in control. a further rise in nacl concentration to 30 mm reduced the root number, and roots shed off at 40 mm nacl. presence of nacl in the nutrient solut ... | 2006 | 16949957 |
| protection against salt toxicity in azolla pinnata-anabaena azollae symbiotic association by using combined-n sources. | protection from salt stress was observed in the terms of yield (fresh and dry weight, chlorophyll and protein) and nitrogenase activity. azollapinnata appeared highly sensitive to 40 mm external nacl stress. fronds of azolla unable to grow beyond a concentration of 30 mm nacl and accordingly death was recorded at 40 mm nacl on the 6th day of incubation. yield was inhibited by various levels of nacl (0, 10, 20 and 30 mm). addition of combined-n to the growth medium protected the association parti ... | 2006 | 17048699 |
| na(+) regulation by combined nitrogen in azolla pinnata-anabaena azollae symbiotic association during salt toxicity. | to study the regulation of na(+) ion by combined-n sources in azolla pinnata-anabaena azollae, na(+) influx, intracellular na(+) and na(+) efflux were investigated in the presence of different n-sources (n(2), nh(4)(+), no(3)(-) and urea) and various nacl concentrations. sodium influx by azolla pinnata fronds was minimum in the presence of no(3)(-). almost identical levels of intracellular sodium, although less than n(2) and nh(4)(+) incubated fronds were observed in the presence of no(3)(-) and ... | 2008 | 17521724 |
| concentrations of heavy metals and aquatic macrophytes of govind ballabh pant sagar an anthropogenic lake affected by coal mining effluent. | five heavy metals cu, cd, mn, pb and hg were found in high concentration from three sampling sites located in asia's largest anthropogenic lake govind ballabh pant gbp sagar. concentrations of these heavy metals were measured in water, bottom sediment and in different parts of the aquatic macrophytes collected from the reservoir. plants collected from the lake were eichhornia crassipes, azolla pinnata, lemna minor, spirodela polyrrhiza, potamogeton pectinatus, marsilea quadrifolia, pistia strati ... | 2008 | 17674134 |
| comparative assessment of azolla pinnata and vallisneria spiralis in hg removal from g.b. pant sagar of singrauli industrial region, india. | the aim of the present work was to monitor the hg pollution in water and sediments of g.b. pant sagar located in singrauli industrial region, india and to suggest the efficient aquatic plants for its phytoremediation. the study assessed the comparative potential of a free floating water fern azolla pinnata and submerged aquatic macrophyte vallisneria spiralis to purify waters polluted by hg. six days laboratory experiments have been conducted to mark the percentage removal of hg at initial conce ... | 2009 | 18210204 |
| response of growth and antioxidant enzymes in azolla plants (azolla pinnata and azolla filiculoides) exposed to uv-b. | effect of ultravilolet-b (0.4 wm(-2)) irradiation on growth, flavonoid content, lipid peroxidation, proline accumulation and activities of superoxide dismutase and peroxidase was comparatively analysed in azolla pinnata and azolla filiculoides. growth measured as increment in dry weight reduced considerably due to all uv-b treatments. however, the reduction was found to be severe in a. filiculoides as compared to a. pinnata. the level of uv-absorbing compound flavonoids increased significantly i ... | 2008 | 18637563 |
| assessment of potential indigenous plant species for the phytoremediation of arsenic-contaminated areas of bangladesh. | soil and water contaminated with arsenic (as) pose a major environmental and human health problem in bangladesh. phytoremediation, a plant-based technology, may provide an economically viable solution for remediating the as-polluted sites. the use of indigenous plants with a high tolerance and accumulation capacity for as may be a very convenient approach for phytoremediation. to assess the potential of native plant species for phytoremediation, plant and soil samples were collected from four as ... | 2008 | 18709925 |
| heavy metals in water, sediments and wetland plants in an aquatic ecosystem of tropical industrial region, india. | concentrations of heavy metals (cu, cr, fe, pb, zn, hg, ni, and cd) and macronutrients (mn) were measured in industrial effluents, water, bottom sediments, and wetland plants from a reservoir, govind ballabh (g.b.) pant sagar, in singrauli industrial region, india. the discharge point of a thermal power plant, a coal mine, and chlor-alkali effluent into the g.b. pant sagar were selected as sampling sites with one reference site in order to compare the findings. the concentrations of heavy metals ... | 2009 | 18998227 |
| phytoremediation of heavy metals in a tropical impoundment of industrial region. | aquatic pollution poses a serious challenge to the scientific community worldwide, since lakes or reservoirs find multifarious use and most often their water is used for drinking, bathing, irrigation, and aquaculture. nine metals and several physicochemical parameters, from four sampling sites in a tropical lake receiving the discharges from a thermal power plant, a coal mine, and a chlor-alkali industry, were studied from 2004 to 2005. pertaining to metal pollution, the site most polluted with ... | 2010 | 19430918 |
| removal and accumulation of mercury by aquatic macrophytes from an open cast coal mine effluent. | in this study, the mercury (hg) removal capacities of two aquatic macrophytes, pistia stratiotes and azolla pinnata, were investigated against the coal mining effluent. these plants reduced mercury from the effluent via rhizofiltration and subsequent accumulation in plant. the removal rate of p. stratiotes and a. pinnata was 80% and 68%, respectively, after 21 days of exposure to the effluent containing 10 microg l(-1) of hg. as mercury from the effluent was accumulated in the root and shoot tis ... | 2009 | 19665290 |
| microcosm investigation on phytoremediation of cr using azolla pinnata. | the extent of chromium (cr) pollution in singrauli industrial region, india was assessed and phytoremediation capacity of a small water fern, azolla pinnata r.br (azollaceae) was observed to purify waters polluted by cr under microcosm condition. azolla pinnata endemic to india is a potential hyper-accumulator of heavy metals. during 13 days of the experiment the fern was grown in the aqueous medium containing cr3+ and cro4(2-) ions, each in a concentration 0.5, 1.0, and 3.0 mg l(-1). the presen ... | 2010 | 20734631 |
| aquatic arsenic: phytoremediation using floating macrophytes. | phytoremediation, a plant based green technology, has received increasing attention after the discovery of hyperaccumulating plants which are able to accumulate, translocate, and concentrate high amount of certain toxic elements in their above-ground/harvestable parts. phytoremediation includes several processes namely, phytoextraction, phytodegradation, rhizofiltration, phytostabilization and phytovolatilization. both terrestrial and aquatic plants have been tested to remediate contaminated soi ... | 2011 | 21435676 |
| biodiversity and importance of floating weeds of dara ismail, khan district of kpk, pakistan. | the present paper is based on the results of taxonomic research work conducted in dera ismail khan district of kpk, pakistan, during 2005 - 2007. the area was extensively surveyed in order to collect floating aquatic weeds. from the study area 11 floating aquatic weed species belonging to 9 genera and 9 families were collected and identified in the light of available literature. these plants include bryophytes: 1 species, ricciocarpus natans (l.) corda; pteridophytes: 2 species, azolla pinnata r ... | 2011 | 22754062 |
| aquatic plant azolla as the universal feedstock for biofuel production. | the quest for sustainable production of renewable and cheap biofuels has triggered an intensive search for domestication of the next generation of bioenergy crops. aquatic plants which can rapidly colonize wetlands are attracting attention because of their ability to grow in wastewaters and produce large amounts of biomass. representatives of azolla species are some of the fastest growing plants, producing substantial biomass when growing in contaminated water and natural ecosystems. together wi ... | 2016 | 27777623 |
| interactive effects of herbicide and enhanced uv-b on growth, oxidative damage and the ascorbate-glutathione cycle in two azolla species. | a field experiment was conducted to investigate the impact of alone and combined exposures of herbicide pretilachlor (5, 10 and 20μgml(-1)) and enhanced uv-b radiation (uv-b1; ambient +2.2kjm(-2) day(-1) and uv-b2; ambient +4.4kjm(-2) day(-1)) on growth, oxidative stress and the ascorbate-glutathione (asa-gsh) cycle in two agronomically important azolla spp. viz., azolla microphylla and azolla pinnata. decreased relative growth rate (rgr) in both the species under tested stress could be linked t ... | 2016 | 27497078 |
| bio indices for 2,4-d sensitivity between two plant species: azolla pinnata r.br. and vernonia cinerea l. with their cellular responses. | in the present experiment a pteridophytic species azolla and an angiospermic species vernonia were evaluated on the basis of cellular reactivity for herbicidal action through ongoing concentrations. initially, both the species recorded a significant activity of iaa-oxidase as mark of iaa metabolism with herbicidal sensitivity. still, vernonia species were more affected on 2,4-d mediated auxin catabolism. the loss of auxin concentrations on the tissues by 2,4-d reaction was also reflected on grow ... | 2016 | 27729723 |
| effect of feeding different levels of azolla pinnata on blood biochemicals, hematology and immunocompetence traits of chabro chicken. | the present study was conducted to see the effect of feeding different levels of azolla meal on blood biochemicals, hematology and immunocompetence traits of chabro chicken. | 2016 | 27051207 |
| separation of toxic rhodamine b from aqueous solution using an efficient low-cost material, azolla pinnata, by adsorption method. | this study investigated the potential of untreated azolla pinnata (ap) to remove toxic rhodamine b (rb) dye. the effects of adsorbent dosage, ph, ionic strength, contact time, and concentration were studied. experiments involving the effects of ph and ionic strength indicated that hydrophobic-hydrophobic interactions might be the dominant force of attraction for the rb-ap adsorption system. the kinetics modelling of the kinetics experiment showed that pseudo-second-order best represented the ads ... | 2016 | 26797814 |
| assessment of native plant species for phytoremediation of heavy metals growing in the vicinity of ntpc sites, kahalgaon, india. | the present investigation was carried out to screen native plants growing in fly ash (fa) contaminated areas near national thermal power corporation (ntpc), kahalgaon, bihar, india with a view to using them for the eco-restoration of the area. a total number of 30 plant species (5 aquatic and 25 terrestrial including 6 ferns) were collected and their diversity status and dominance were also studied. after screening of dominant species at highly polluted site, 8 terrestrial and 5 aquatic plants w ... | 2016 | 26442874 |
| bimodal effect of hydrogen peroxide and oxidative events in nitrite-induced rapid root abscission by the water fern azolla pinnata. | in the genus azolla rapid abscission of roots from floating fronds occurs within minutes in response to a variety of stresses, including exposure to nitrite. we found that hydrogen peroxide, though itself not an inducer of root abscission, modulates nitrite-induced root abscission by azolla pinnata in a dose-dependent manner, with 2 mm h2o2 significantly diminishing the responsiveness to 2 mm nano2, and 10 mm h2o2 slightly enhancing it. hypoxia, which has been found in other plants to result in ... | 2015 | 26217368 |
| phytoremediation of domestic wastewaters in free water surface constructed wetlands using azolla pinnata. | two constructed wetlands, one with azolla pinnata plant (cw1) and the other without (cw2) for treating domestic wastewaters were developed. fifteen water parameters which include: dissolved oxygen (do), biochemical oxygen demand (bod5), chemical oxygen demand (cod), total suspended solid (tss), total phosphorus (tp), total nitrogen (tn), ammoniacal nitrogen (nh3n), turbidity, ph, electrical conductivity (ec), iron (fe), magnesium (mg), manganese (mn), and heavy metals such as lead (pb) and zinc ... | 2016 | 26121232 |
| the simulation model of growth and cell divisions for the root apex with an apical cell in application to azolla pinnata. | in contrast to seed plants, the roots of most ferns have a single apical cell which is the ultimate source of all cells in the root. the apical cell has a tetrahedral shape and divides asymmetrically. the root cap derives from the distal division face, while merophytes derived from three proximal division faces contribute to the root proper. the merophytes are produced sequentially forming three sectors along a helix around the root axis. during development, they divide and differentiate in a pr ... | 2013 | 23989670 |
| management of fresh water weeds (macrophytes) by vermicomposting using eisenia fetida. | in the present study, potential of eisenia fetida to recycle the different types of fresh water weeds (macrophytes) used as substrate in different reactors (azolla pinnata reactor, trapa natans reactor, ceratophyllum demersum reactor, free-floating macrophytes mixture reactor, and submerged macrophytes mixture reactor) during 2 months experiment is investigated. e. fetida showed significant variation in number and weight among the reactors and during the different fortnights (p <0.05) with maxim ... | 2013 | 23589265 |
| bioassay analysis of efficacy of phytoremediation in decontamination of coal mine effluent. | phytoremediation efficacy of lemna minor and azolla pinnata in decontaminating metals from coal mine effluent (cme) was analyzed using bioassays. catfish heteropneustes fossilis were exposed to both the phytoremediated cmes for the metal bioaccumulation analysis and biochemical alteration in seven vital tissues. gross concentration of metals accumulated in liver, kidneys, air breathing organs (abo), skin and muscle were greater in fish exposed to a. pinnata remediated cme (ap-cme) than those exp ... | 2013 | 23566881 |
| polyamine-induced rapid root abscission in azolla pinnata. | floating ferns of the genus azolla detach their roots under stress conditions, a unique adaptive response termed rapid root abscission. we found that azolla pinnata plants exhibited dose-dependent rapid root abscission in response to the polyamines spermidine and spermine after a substantial time lag (>20 min). the duration of the time lag decreased in response to high ph and high temperature whereas high light intensity increased the time lag and markedly lowered the rate of abscission. the oxi ... | 2012 | 22997568 |
| azolla pinnata growth performance in different water sources. | azolla pinnata r.br. growth performance experiments in different water sources were conducted from may until july 2011 at aquaculture research station, puchong, malaysia. four types of water sources (waste water, drain water, paddy field water and distilled water) each with different nutrient contents were used to grow and evaluate the growth performance of a. pinnata. four water sources with different nutrient contents; waste, drain, paddy and distilled water as control were used to evaluate th ... | 2012 | 24218931 |
| phytoremediation of the coalmine effluent. | coal mine effluent was subjected to detoxification by phytoremediation using two macrophytes azolla pinnata and lemna minor. both plants were kept separately in the effluents for 7 day. the initial concentration (mg l⁻¹) of eight metals: fe, mn, cu, zn, ni, pb, cr and cd investigated in the effluent were 22.91±0.02, 9.61±1.6, 2.04±0.23, 1.03±0.15, 0.86±0.19, 0.69±0.11, 0.18±0.007 and 0.06±0.008 respectively. the initial fresh biomass of each plant was 100g. after one week, metals removed in a. p ... | 2012 | 22571948 |
| phytoremediation of the toxic effluent generated during recovery of precious metals from polymetallic sea nodules. | recovery of metals from the polymetallic sea nodules at the pilot plant at national metallurgical laboratory, jamshedpur, india has generated a highly toxic effluent. this effluent contains several metals like mn, cu, zn, fe, pb, cr, and cd that pollute the neighboring water bodies when discharged. hence detoxification of this effluent was practiced using two plants: lemna minor and azolla pinnata for 7 days. during investigation a. pinnata removed 96% of mn, 97% of cu, 98% of zn, 70% of fe, 96% ... | 2012 | 22567724 |
| heavy metal pollution in lentic ecosystem of sub-tropical industrial region and its phytoremediation. | metals and several physicochemical parameters, from four sampling sites in a tropical lake receiving the discharges from a thermal power plant, a coal mine and a chlor-alkali industry, were studied from 2004-2005. pertaining to metal pollution, the site most polluted with heavy metals was belwadah, i.e., waters and sediments had the highest concentration of all the metals examined. the reference site was characterized by the presence of low concentrations of metals in waters and in sediments. fu ... | 2010 | 20734618 |
| phytoremediation of hg and cd from industrial effluents using an aquatic free floating macrophyte azolla pinnata. | the level of heavy metal pollution in singrauli, an industrial region in india, was assessed and the phytoremediation capacity of a small water fern, azolla pinnata r.br (azollaceae), was observed to purify waters polluted by two heavy metals, i.e., mercury (hg) and cadmium (cd) under a microcosm condition. azolla pinnata is endemic to india and is an abundant and easy-growing free-floating water fern usually found in the rice fields, polluted ponds, and reservoirs of india. the fern was grown i ... | 2013 | 19260224 |
| wastewater management through biomass of azolla pinnata: an eco-sustainable approach. | | 2007 | 17847810 |
| viability of water weeds and microalga in pulp and paper mill wastewater. | water weeds azolla pinnata and lemna minor and the chlorophycean alga scendesmus bijugatus were grown in a paper mill wastewater. the objective of the study was to assess the viability of these species upon exposure to such effluents and to assess their potential in the improvement of effluent quality. the wastewater was analysed before and after the treatment with these species. the growth of the alga and the hydrophytes was also measured. the algal assay revealed that the clear effluent will p ... | 2001 | 12395506 |
| effect of the plant azolla pinnata on survival, growth rate, fecundity and hatchability of egg-masses of biomphalaria alexandrina snails. | data indicated that azolla pinnata plants variously reduce the growth rate of biomphalaria alexandrina snails expressed as net increase in shell diameter (direct or indirect exposure). the plant density played an important role in this respect. the higher the plant density was the lower the growth rate and vice versa. too, indirect exposure of newly hatched b. alexandrina resulted from exposed treated eggs reduced the growth rate of these snails. data revealed that direct and/or indirect exposur ... | 1997 | 9425826 |
| removal of heavy metals by two free floating aquatic macrophytes. | a concentration-dependent decrease in biomass, protein, rna, dna, and nutrient (no3(-) and po4(3-)) uptake of lemna minor and azolla pinnata by cr, ni, and zn was detected. cr was found to exert maximum toxicity followed by ni and zn. metal uptake was dependent on time and concentration of metal in the external medium. both the macrophytes, however, showed preference for zn followed by ni and cr. the uptake kinetics also revealed a low vmax and high km for cr. l. minor was more efficient in accu ... | 1996 | 8988809 |
| adsorption and uptake of cadmium by azolla pinnata: kinetics of inhibition by cations. | a. pinnata showed a remarkable ability of taking up cd from the external medium. of the total cd taken up by the test plant, surface adsorption was about 90%. cd adsorption did not occur at a constant rate, however, an equilibrium was reached in 2 h. the uptake of cd occurred at a constant rate. test cations, including heavy metals (ca, mg, k, na, ni, fe, cu and zn), inhibited adsorption as well as uptake of cd. cd adsorption was competitively inhibited by cu, fe and zn, whereas ca, mg, k, na an ... | 1995 | 7546343 |
| [physiological and ecological characteristics of azolla pinnata and its possible use in biological life support systems]. | the principal physiological and ecological characteristics of azolla pinnata were investigated in order to determine its potential use in biological life support systems. plant requirements for biogenic elements were specified in order to develop balanced nutrient mixtures for continuous cultivation. data on the growth and development, photosynthetic and nitrogen fixation rate, and biochemical composition of the plant were obtained for optimal cultivation conditions. the plant biomass contains l ... | 2013 | 6139507 |
| [effect of weightlessness on the water fern azolla]. | an exposure to 6-day weightlessness of the fern azolla pinnata r. br. symbiotically related to the nitrogen fixing alga anabena azollae did not affect the main biological characteristics (growth, development and morphological structure) of both fern plants and algae. the exposure did not influence the growth rate or subsequent azolla generations on the earth. | 2008 | 7176510 |
| spatial and temporal regulation of nucleating sites for arrays of cortical microtubules in root tip cells of the water fern azolla pinnata. | root primordia of the water fern azolla pinnata were examined by conventional and high voltage electron microscopy to extend previous evidence concerning the existence and behaviour of nucleating sites (ns) for microtubule arrays in the cortex of plant cells. putative ns are visible as foci consisting of clusters of microtubules, a population of particles or vesicles and associated dense material. they are concentrated along the edges of the cells but become conspicuous only when cortical arrays ... | 1980 | 7460968 |
| interpolation of microtubules into cortical arrays during cell elongation and differentiation in roots of azolla pinnata. | longitudinal sections of roots of azolla pinnata r. br. were prepared for electron microscopy so that cortical microtubules could be counted along the longitudinal walls in cell files in the endodermis, pericycle, and inner and outer cortex, and in sieve and xylem elements. with the exception of the xylem, where there are no transverse cell divisions, each file of cells commences with its initial cell and then possesses a zone of concomitant cell expansion and transverse cell division, followed, ... | 1979 | 479328 |
| age-related and origin-related control of the numbers of plasmodesmata in cell walls of developing azolla roots. | plasmodesmata were counted in the longitudinal and transverse walls in developmental sequences of merophytes in roots of azolla pinnata r.br. the differences between certain categories of longitudinal wall were traced to factors that govern the surface area of the cell plates, the density of plasmodesmata (number per unit area of cell plate), and the amount by which each type of plate expands. no evidence for secondary augmentation of plasmodesmatal numbers after the cell-plate stage of developm ... | 1978 | 24408368 |
| evidence for initiation of microtubules in discrete regions of the cell cortex in azolla root-tip cells, and an hypothesis on the development of cortical arrays of microtubules. | complexes of microtubules, vesicles, and (to varying degrees) dense matrix material around the microtubules were seen along the edges of cells in root apices of azolla pinnata r.br. (viewing the cells as polyhedra with faces, vertices and edges). they are best developed after cytokinesis has been completed, when the daughter cells are reinstating their interphase arrays of microtubules. they are not confined to edges made by the junction of new cell plates with parental walls, but occur also alo ... | 1978 | 24408367 |
| pre-prophase bands of microtubules in all categories of formative and proliferative cell division in azolla roots. | pre-prophase bands of microtubules were found in every category of cell division, symmetrical and asymmetrical, in the cell lineages of the root apex of azolla pinnata r.br. and a. filiculoides lam., and in the transverse divisions in the cell files of the roots. they are also found in the asymmetrical cell division that gives rise to trichoblasts in roots of hydrocharis dubia (b1). backer. it is possible, in a variety of cell types in roots of azolla, to predict within a fraction of a micrometr ... | 1978 | 24408366 |