Source: AGRICOLA database (1970-1996)

Allam, A. F. (2000). Evaluation of different means of control of snail intermediate host of Schistosoma mansoni. Journal of the Egyptian Society of Parasitology. [print] August 30(2): 441-450. {a} Department of Parasitology, Medical Research Institute, Alexandria University, Alexandria, Egypt

Aziz, A. (2000). Synura uvella Ehr. (Chrysophyceae): A new record for Bangladesh. Bangladesh Journal of Botany. [print] June 29(1): 79-80. {a} Department of Botany, University of Dhaka, Dhaka, 1000, Bangladesh

Pandey, R. P. and N. P. Singh (2000). Studies on phytodiversity of Kumbhalgarh Wildlife Sanctuary in Rajasthan. Journal of Economic and Taxonomic Botany. [print] March 24(1): 61-69. {a} Botanical Survey of India, Jodhpur, 342 008, India

Saygideger, S. (2000). Sorption of cadmium and their effects on growth, protein contents, and photosynthetic pigment composition of Veronica anagallis-aquatica L. and Ranunculus aquatilis L. Bulletin of Environmental Contamination and Toxicology. [print] October 65(4): 459-464. {a} Biology Department, University of Cukurova, 01330, Adana, Turkey

Adelia, D. M. and F. Carrapico (1999). The aquatic plants community associated with Azolla pinnata in the Geba River (Guinea-Bissau). Garcia De Orta Serie de Botanica. [print] 14(1): 89-92. {a} Centro de Botanica, Instituto de Investigacao Cientifica Tropical, Rua da Junqueira, 86, 1300-344, Lisboa, Portugal

Kar, P. P., S. Mishra, et al. (1999). Influence of gibberellic acid on the sporulation of Azolla caroliniana, Azolla microphylla and Azolla pinnata. Biology and Fertility of Soils. Aug. 29(4): 424-429. {a} Laboratory of Blue-Green Algae, Central Rice Research Institute, Cuttack, Orissa, 753006, India

Khatun, A., M. A. Ali, et al. (1999). Comparison of the nutritive value for laying hens of diets containing azolla (Azolla pinnata) based on formulation using digestible protein and digestible amino acid versus total protein and total amino acid. Animal Feed Science and Technology. Sept. 81(1-2): 43-56. {a} School of Veterinary Science and Animal Production, Gatton College, University of Queensland, Lawes, QLD, 4345, Australia

Serrano, R., F. Carrapico, et al. (1999). The presence of lectins in bacteria associated with the Azolla-Anabaena symbiosis. Symbiosis 27(2): 169-178. {a} Centro de Biologia Ambiental, Faculdade de Farmacia da Universidade de Lisboa, Av. Forcas Armadas, 1649-019, Lisboa, Portugal

Tilak, M. and K. Shivappashetty (1999). Effect of different nutrients on the growth of algal symbionts. Indian Journal of Plant Physiology. April June 4(2): 127-129. {a} Sri Ramakrishna Mission Vidayalaya, Institute of Agriculture and Rural Development, Periyanaickanpalayam, Coimbatore, 641020, India

Tilak, M. and K. Shivappashetty (1999). Effect of different physical and chemical parameters on the growth of algal symbionts. Indian Journal of Plant Physiology. July Sept 4(3): 224-226. {a} Sri Ramakrishna Mission Vidayalaya, Institute of Agricultural and Rural Development, Periyanaickanpalayam, Coimbatore, 641020, India

Uheda, E., S. Kitoh, et al. (1999). Response of six Azolla species to transient high-temperature stress. Aquatic Botany. May 64(1): 87-92. {a} Research Institute for Advanced Science and Technology, University of Osaka Prefecture, Gakuen-cho 1-2, Sakai, Osaka, 593, Japan

Veys, P., L. Waterkeyn, et al. (1999). The pore of the leaf cavity of Azolla: Morphology, cytochemistry and possible functions. Symbiosis 27(1): 33-57. {a} Laboratory of Plant Biology, Faculty of Sciences, Catholic University of Louvain, Place Croix du Sud 5 bte 14, B-1348, Louvain-la-Neuve, Belgium

Zheng, W. W., M. Nilsson, et al. (1999). Genetic diversity and classification of cyanobacteria in different Azolla species by the use of PCR fingerprinting. Theoretical and Applied Genetics. Nov. 99(7-8): 1187-1193. {a} Department of Botany, Stockholm University, S-10691, Stockholm, Sweden

Dinesh, R. and R. P. Dubey (1998). Nitrogen mineralization rates and kinetics in soils freshly amended with green manures. Journal of Agronomy and Crop Science 181(1): 49-53. Central Agricultural Res. Inst., P.O. Box 181, Port Blair, Andaman and Nicobar Islands 744101, India

Fasakin, A. E. and A. M. Balogun (1998). Evaluation of dried water fern (Azolla pinnata) as a replacer for soybean dietary components for Clarias gariepinus fingerlings. Journal of Aquaculture in the Tropics 13(1): 57-64. Dep. Fisheries and Wildlife, Federal Univ. Technol., PMB 704, Akure, Nigeria

Forni, C., A. Haegi, et al. (1998). Polysaccharide composition of the mucilage of Azolla algal packets. Symbiosis 24(3): 303-313. {a} Dip. Biol., Univ. Roma "Tor Vergata", Via della Ricerca Scientifica, 00133 Rome, Italy

Glagoleva, O. B., E. S. Lobakova, et al. (1998). Endosymbiosis formation between rape roots and nitrogen-fixing rhizosphere bacteria. Doklady Akademii Nauk 362(2): 283-285. M. V. Lomonosov Mosc. State Univ., Moscow, Russia

Hill, M. P. (1998). Herbivorous insect fauna associated with Azolla species (Pteridophyta: Azollaceae) in southern Africa. African Entomology 6(2): 370-372. {a} Weeds Div., ARC-Plant Prot. Res. Inst., Private Bag X134, Pretoria 0001, South Africa

Liu, X., K. Takayama, et al. (1998). Cultivation condition and nutritive value of Azolla as a feed resource. Grassland Science 44(3): 266-271. Fac. Agric., Kagoshima Univ., 1-21-24 Korimoto, Kagoshima, Kagoshima 890-0065, Japan

Rai, V. and A. K. Rai (1998). Growth behaviour of Azolla pinnata at various salinity levels and induction of high salt tolerance. Plant and Soil 206(1): 79-84. {a} Department of Botany, Banaras Hindu University, Varanasi, 221005, India

Singh, A., K. Singh, et al. (1998). Biomass evaluation of Azolla pinnata R. Brown under certain soils coupled with organic matters. Indian Fern Journal 15(1-2): 198-204. {a} Department of Botany, Punjabi University, Patiala, 147 002, India

Vaishampayan, A., T. Dey, et al. (1998). Successful rice cultivation with genetically manipulated thermo-tolerant Azolla as a bio-N fertilizer. Acta Hydrobiologica. [print] 40(3): 207-213. {a} Institut fuer Botanik und Pharmazeutische Biologie, Friedrich-Alexander-Universitaet, Staudtstr. 5, D-91058, Erlangen, Germany

Zidan, Z. H., H. A. M. Abdel, et al. (1998). Susceptibility of Biomphalaria alexandrina to the plant Azolla pinnata and some herbicides in relation to infection with Schistosoma mansoni Miracidia. Journal of the Egyptian Society of Parasitology 28(1): 89-100. {a} Fac. Agric., Ains Shams Univ., Cairo, Egypt

Basudha, C. and W. Vishwanath (1997). Formulated feed based on aquatic weed Azolla and fish meal for rearing medium carp Osteobrama belangeri (Valenciennes). Journal of Aquaculture in the Tropics 12(3): 155-164. Dep. Life Sci., Manipur Univ., Canchipur-795 003 Manipur, India

Hafez, A. M. A., Z. H. Zidan, et al. (1997). Effect of the plant Azolla pinnata on survival, growth rate, fecundity and hatchability of egg-masses of Biomphalaria alexandrina snails. Journal of the Egyptian Society of Parasitology 27(3): 825-841. {a} Faculty Agriculture, Ain Shams Univ., Cairo, Egypt

Kim, J. J. H., K. Krawczyk, et al. (1997). Fingerprinting cyanobionts and hosts of the Azolla symbioses by DNA amplification. World Journal of Microbiology and Biotechnology 13(1): 97-101. {a} Dep. Nat. Sci., Univ. Mich.-Dearborn, 4901 Evergreen Rd., Dearborn, MI 48128-1491, USA

Siddiqi, M. A., M. Athar, et al. (1997). Effect of farmyard manure and mineral fertilizers on coloration, growth, and biomass production of Azolla pinnata. Phytologia 83(1): 36-41. {a} Natl. Agric. Res. Center, Pak, Agric. Res. Council, Park Road, Islamabad 45500, Pakistan

Azmal, A. K. M., T. Marumoto, et al. (1996). Mineralization and microbial biomass formation in upland soil amended with some tropical plant residues at different temperatures. Soil Science and Plant Nutrition 42(3): 463-473. Fac. Agric., Yamaguchi Univ., Yamaguchi 753, Japan

Kalita, M. C. and C. M. Sarma (1996). Effect of carbofuran on growth and metabolism of Azolla-Anabaena symbionts. Advances in Plant Sciences 9(2): 217-221. {a} Dep. Biotechnol., Gauhati Univ., Guwahati 781 014, Assam, India

Leena, K. R. and P. V. Madhusoodanan (1996). Effect of phosphorus on growth and nitrogen fixation of three Azolla spp. Geobios Jodhpur 23(4): 238-240. Dep. Bot., Univ. Calicut, Calicut-673635, Kerala, India

Mallick, N., Shardendu, et al. (1996). Removal of heavy metals by two free floating aquatic macrophytes. Biomedical and Environmental Sciences 9(4): 399-407. {a} Cent. Advanced Study Botany, Banaras Hindu Univ., Varanasi 221005, India

Noraho, N. and J. P. Gaur (1996). Cadmium adsorption and intracellular uptake by two macrophytes, Azolla pinnata and Spirodela polyrhiza. Archiv fuer Hydrobiologie 136(1): 135-144. {a} Cent. Advanced Study Bot., Banaras Hindu Univ., Varanasi 221 005, India

Sevichan, P. J. and P. V. Madhusoodanan (1996). Effect of Azolla pinnata R. Br. application as a biofertilizer for paddy in Kuttanad, Kerala. Geobios Jodhpur 23(1): 67-68. {a} P.G. Dep. Botany, St. Joseph's Coll., Calicut-673 008, India

Ali, M. A. and S. Leeson (1995). The nutritive value of some indigenous Asian poultry feed ingredients. Animal Feed Science and Technology 55(3-4): 227-237. {a} Dep. Anim. Poultry Sci., Univ. Guelph, Guelph, ON N1G 2W1, Canada

Caudales, R., J. M. Wells, et al. (1995). Fatty acid composition of symbiotic cyanobacteria from different host plant (Azolla) species: Evidence for coevolution of host and symbiont. International Journal of Systematic Bacteriology 45(2): 364-370. {a} Dep. Biol. Sci., Botswana Univ., Private Bag 0022, Gaborone, Botswana

Gaur, J. P. and N. Noraho (1995). Role of certain environmental factors on cadmium uptake and toxicity in Spirodela polyrhiza (L.) Schleid. and Azolla pinnata R.Br. Biomedical and Environmental Sciences 8(3): 202-210. {a} Cent. Adv. Stud. Bot., Banaras Hindu Univ., Varanasi 221 005, India

Gaur, J. P. and N. Noraho (1995). Adsorption and uptake of cadmium by Azolla pinnata: Kinetics of inhibition by cations. Biomedical and Environmental Sciences 8(2): 149-157. {a} Labortatory Algal Biology, Centre Advanced Study Botany, Banaras Hindu Univ., Varanasi 221 005, India

Gupta, M. and S. Devi (1995). Uptake and toxicity of cadmium in aquatic ferns. Journal of Environmental Biology 16(2): 131-136. Electron Microscopy Sect., Natl. Botanical Res. Inst., Lucknow-226 001, India

Hall, E. and W. J. Zimmerman (1995). Algicides in Azolla germplasm management. International Rice Research Notes 20(3): 21-22. Nat. Sci. Dep., Univ. Michigan-Dearborn, Dearborn, MI 48128, USA

Ismail, B. S., T. C. Siew, et al. (1995). Effect of molinate and carbofuran on nitrogen fixation by Azolla pinnata. Microbios 82(331): 127-134. Dep. Botany, Univ. Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia

Kalita, M. C. and C. M. Sarma (1995). Effect of BHC on growth, chlorophyll contents and nitrogen fixation of Azolla-Anabaena symbionts. Journal of Phytological Research 8(2): 133-136. {a} Dep. Biotechnol., Gauhati Univ., Guwahati 781 014, Assam, India

Kolbek, J. and J. Dostalek (1995). Vegetation of water basins in the northern part of the Korean Peninsula. Thaiszia 5(2): 121-130. Dep. Geobot., Inst. Bot., Acad. Sci. Czech Republic, 252 43 Pruhonice, Czech Republic

Pervin, S., M. S. Hoque, et al. (1995). The use of Sesbania as an alternative source of urea-N for BR-11 rice. Pakistan Journal of Scientific and Industrial Research 38(2): 85-87. Dep. Soil Sci., Bangladesh Agric. Univ., Mymensingh, Bangladesh

Shanmughavel, P. (1995). Seasonal primary production and energy accumulation in macrophytic vegetation of Bannar Lake, Sathyamangalam Forests. Advances in Plant Sciences 8(2): 410-413. Dep. Botany, Bharathiar Univ., Coimbatore 641 046, India

Singh, A., A. Singh, et al. (1995). Biomass production of Azolla pinnata R. Brown under different photoperiods. Indian Fern Journal 12(1-2): 133-138. Dep. Bot., Punjabi Univ., Patiala, 147 002 Punjab, India

Srivstava, N. K. and A. K. Gupta (1995). Ecological investigation of Varuna river corridor: A case study. Acta Botanica Indica 23(1): 39-42. {a} Ecology Res. Lab., Cent. Adv. Stud. Botany, Banaras Hindu Univ., Varanasi 221005, USA

Taheruzzaman, Q. and D. P. Kushari (1995). Biomass and concentrations of macronutrients and mercury in Azolla pinnata R.BR. in Indian ponds enriched by anthropogenic effluents. Netherlands Journal of Aquatic Ecology 29(2): 157-160. Ecol. Lab., Dep. Botany, Univ. Burdwan, Burdwan 713104, West Bengal, India

Badelt, K., R. G. White, et al. (1994). Ultrastructural specializations of the cell wall sleeve around plasmodesmata. American Journal of Botany 81(11): 1422-1427. {a} Dep. Ecol. Evol. Biol., Monash Univ., Clayton, Victoria 3168, Australia

Barlow, P. W. (1994). Structure and function at the root apex - phylogenetic and ontogenetic perspectives on apical cells and quiescent centres. Plant and Soil 167(1): 1-16. Dep. Agric. Sci., Univ. Bristol, Inst. Arable Crops Res., Long Ashton Res. Stn., Bristol BS18 9AF, UK

Das, D., K. Sikdar, et al. (1994). Potential of Azolla pinnata as biogas generator and as a fish-feed. Indian Journal of Environmental Health 36(3): 186-191. {a} Chem. Eng. Dep., Indian Inst. Technol., Kharagpur 721302, India

Gaur, J. P., N. Noraho, et al. (1994). Relationship between heavy metal accumulation and toxicity in Spirodela polyrhiza (L.) Schleid, and Azolla pinnata R. Br. Aquatic Botany 49(2-3): 183-192. {a} Centre Advanced Study Botany, Banaras Hindu Univ., Varanasi 221 005, India

Harsh, R. and B. D. Sharma (1994). Pteridophytes of Rajasthan: Phytochemistry of Azolla pinnata Brown. Indian Fern Journal 11(1-2): 150-152. Dep. Botany, JNV Univ., Jodhpur 342 001, India

Hur, J. S. and A. R. Wellburn (1994). Effects of atmospheric NO-2 on Azolla-Anabaena symbiosis. Annals of Botany London 73(2): 137-141. {a} Div. Biol. Sci., Inst. Environmental Biol. Sci., Lancaster Univ., Lancaster LA1 4 YQ, UK

Hur, J. S. and A. R. Wellburn (1994). Effects of atmospheric O-3 on Azolla-anabaena symbiosis. Annals of Botany London 73(2): 205-209. {a} Div. Biol. Sci., Inst. Environmental Biol. Sci., Lancaster Univ., Lancaster LA1 4YQ, UK

Joseph, A., P. M. Sherief, et al. (1994). Effect of different dietary inclusion levels of Azolla pinnata on the growth, food conversion and muscle composition of Etroplus suratensis (Bloch). Journal of Aquaculture in the Tropics 9(1): 87-94. Coll. Fisheries, Kerala Agric. Univ., Panangad, Cochin 682 506, Kerala, India

Landolt, E. (1994). The Lemnaceae of Zimbabwe and Botswana. Berichte des Geobotanischen Institutes der Eidgenoessischen Technischen Hochschule Stiftung Ruebel Zuerich(60): 110-136. Geobot. Inst. ETH, Stiftung Rubel, Zurichbergstr. 38, CH-8044 Zurich, Switzerland

Patel, H. R., D. J. Patel, et al. (1994). Effectivity of Clerodendron inerme L., Catharanthus roseus (L.) G. Don. and Azolla pinnata R.BR. for management of root-knot nematodes on okra. Pakistan Journal of Nematology 12(1): 95-98. Dep. Nematol., B.A. College Agric., Gujarat Agric. Univ., Anand Campus, Anand-388 110, India

Singh, A. and S. Singh (1994). Biomass evaluation of Azolla pinnata R. Brown under two natural habitats of Punjab, India. Indian Fern Journal 11(1-2): 167-172. Dep. Botany, Punjabi Univ., Patiala 147 002 Punjab, India

Ahluwalia, A. S., S. Dua, et al. (1993). Cultural and biochemical studies in a free floating water fern, Azolla pinnata R. Brown. Indian Fern Journal 10(1-2): 98-103. Dep. Botany, Panjab Univ., Chandigarh 160014, India

Daniel, J. N. and D. P. Bartholomew (1993). Growth and photosynthesis of three Azolla species in response to irradiance. Biotronics 22: 1-14. {a} BAIF Dev. Res. Found., Senapati Bapat Road, Pune 411 016, India

Dewanji, A. (1993). Amino acid composition of leaf proteins extracted from some aquatic weeds. Journal of Agricultural and Food Chemistry 41(8): 1232-1236. Biol. Sci. Div., India Statistical Inst., 203 B.T. Rd., Calcutta 700 035, India

Grasser, K. D., W. Hetz, et al. (1993). Stimulatory effect of the maize HMGa protein on reporter gene expression in maize protoplasts. FEBS Federation of European Biochemical Societies Letters 327(2): 141-144. {a} Inst. Biol. III, Albert-Ludwigs-Universitaet Freiburg, Schaenzlestr 1, D-7800 Freiburg, Germany

Hur, J. S. and A. R. Wellburn (1993). Effects of atmospheric sulfur dioxide on Azolla and Anabaena symbiosis. Physiologia Plantarum 88(1): 65-72. {a} Div. Biol. Sci., Inst. Environmental Biol. Sci., Lancaster Univ., Lancaster LA1 4YQ, UK

Jubb, T. F., D. S. Pinch, et al. (1993). Treatment with vitamins A, D and E did not reduce weight loss in transported cattle. Australian Veterinary Journal 70(5): 171-173. {a} Dep. Agric., PO Box 19, Kununurra, Western Australia 6743

Kannaiyan, S. (1993). Effect of Benlate on growth and nitrogen fixation in three strains of Azolla pinnata. Malaysian Agricultural Journal 54(4): 172-181. Department Agricultural Microbiology, Tamil Nadu Agricultural Univ., Coimbatore-0641 003, Tamil Nadu, India

Khan, M. I. and B. Jahan (1993). Effect of aqueous extracts and leachates of anthers of Ceratonia siliqua L., on the inhibition of lettuce seed germination. Pakistan Journal of Botany 25(1): 21-28. Dep. Bot., Univ. Karachi, Karachi 75270, Pakistan

Khondker, M. and S. Rahim (1993). Investigation on the water quality of Dhanmondi lake: II. Periphytic and planktonic algae as indicators. Bangladesh Journal of Botany 22(1): 49-53. Dep. Botany, Univ. Dhaka, Dhaka 1000, Bangladesh

Lee, R. F. and J. B. Weber (1993). Influence of polymers on the mobility, loss, and bioactivity of carbon-14 from carbon-14-labeled atrazine, metolachlor, and primisulfuron. Journal of Agricultural and Food Chemistry 41(6): 988-995. {a} Crop Sci. Dep., Box 7620, NC State Univ., Raleigh, NC 27695-7620, USA

Madhusoodanan, P. V., K. R. Leena, et al. (1993). Taxonomy and ecology of the aquatic Pteridophytes of Kerala, South India. Journal of Economic and Taxonomic Botany 17(3): 635-643. Dep. Botany, Univ. Calicut, Calicut-673 635, India

Nazrul, I. A. K. M. (1993). Growth, water content and chemical composition of Azolla pinnata R. Br. in relation to acidity. Bangladesh Journal of Botany 22(1): 55-59. Dep. Botany, Dhaka Univ., Dhaka, Bangladesh

Saunders, R. M. K. and K. Fowler (1993). The supraspecific taxonomy and evolution of the fern genus Azolla (Azollaceae). Plant Systematics and Evolution 184(3-4): 175-193. {a} Dep. Botany, Univ. Hong Kong, Pokfulam Rd., Hong Kong

Srinivasan, G., P. Pothiraj, et al. (1993). Response of azolla (Azolla pinnata) to rice (Oryza sativa) herbicides. Indian Journal of Agronomy 38(1): 156-158. {a} Central Tuber Crops Res.Inst., Trivandrum 695 017, India

Tamang, Y. and G. Samanta (1993). Feeding value of azolla (Azolla pinnata) an aquatic fern in Black Bengal goats. Indian Journal of Animal Sciences 63(2): 188-191. Dep. Anim. Nutr., Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal 741 520, India

Yurina, N. P., G. G. Belkina, et al. (1993). Isolation of DNA from Azolla pinnata chloroplasts and its characterization. Prikladnaya Biokhimiya i Mikrobiologiya 29(2): 299-307. A.N. Bakh Inst. Biochem., Acad. Sci. Russ., Moscow, Russia

Baskin, T. I., C. H. Busby, et al. (1992). Improvements in immunostaining samples embedded in methacrylate: Localization of microtubules and other antigens throughout developing organs in plants of diverse taxa. Planta 187(3): 405-413.

Cary, P. R. and P. G. J. Weerts (1992). Growth and nutrient composition of Azolla pinnata R. Brown and Azolla filiculoides Lamarck as affected by water temperature, nitrogen and phosphorus supply, light intensity and pH. Aquatic Botany 43(2): 163-180.

El, S. A. F. M. (1992). Effects of substituting fish meal with Azolla pinnata in practical diets for fingerling and adult Nile tilapia, Oreochromis niloticus (L.). Aquaculture And Fisheries Management 23(2): 167-173.

Forni, C., J. Riov, et al. (1992). Indole-3-acetic acid (IAA) production by Arthrobacter spp. isolated from Azolla. Journal Of General Microbiology 138(2): 377-381.

Jain, S. K., G. S. Gujral, et al. (1992). Production of biogas from Azolla pinnata R.Br. and Lemna minor L.: Effect of heavy metal contamination. Bioresource Technology 41(3): 273-277.

Kushari, D. P. and I. Watanabe (1992). Differential responses of Azolla to phosphorus deficiency: II. Screening method under concentration controlled conditions. Soil Science And Plant Nutrition 38(1): 65-73.

Madhusoodanan, P. V. and P. J. Sevichan (1992). Azolla microphylla Kaulfuss: An economically important biofertilizer for paddy fields of Kerala. Journal of Economic and Taxonomic Botany 16(1): 73-76. Dep. Botany, Calicut Univ., Calicut-673 635, India

Madhuysoodanan, P. V., K. R. Leena, et al. (1992). Aquatic pteridophytes of Kerala, S. India. Journal of Economic and Taxonomic Botany 16(1): 125-132. Dep. Botany, Univ. Calicut, Calicut-673 625, India

Prykhod, k. L. P., O. V. Kovalenko, et al. (1992). A comparative study of Anabaena azollae Strasb. (Cyanophyta, Hormogoniophyceae). Ukrayins'kyi Botanichnyi Zhurnal 49(2): 67-73. M.H. Kholodnyi Inst. Bot., Acad. Sci. Ukr., Kiev, Ukraine

Rosenani, A. B. and H. A. Chulan (1992). Availability of nitrogen from nitrogen-15 labelled Azolla pinnata and urea to flooded rice. Plant And Soil 143(2): 153-161.

Saunders, R. M. K. and K. Fowler (1992). A morphological taxonomic revision of Azolla Lam. section Rhizosperma (Mey.) Mett. (Azollaceae). Botanical Journal Of The Linnean Society 109(3): 329-357.

Serdyuk, O. P., L. D. Smolygina, et al. (1992). Phytohormones formed by nitrogen-fixing association of Azolla pinnata with Anabaena azollae. Doklady Akademii Nauk 325(3): 620-622. Inst. Soil Sci. Photosynth., Acad. Sci. Russ., Pushchino, Russia

Singh, P. K., D. P. Singh, et al. (1992). Growth, acetylene reduction activity, nitrate uptake and nitrate reductase activity of Azolla caroliniana and Azolla pinnata at varying nitrate levels. Biochemie Und Physiologie Der Pflanzen 188(2): 121-127.

Turishcheva, M. S., D. L. Gaganidze, et al. (1992). Isolation of a transcriptionally active DNA-protein complex from chloroplasts of fern Azolla pinnata. Fiziologiya Rastenii Moscow 39(1): 55-65. A.N. Bakh Inss. Biochem., Acad. Sci. Russ., Moscow, Russia

Ventura, W., I. Watanabe, et al. (1992). Mineralization of Azolla nitrogen and its availability to wetland rice: II. Fertilizer effect and nitrogen-15 uptake by rice from different species of Azolla with varying nitrogen contents. Soil Science and Plant Nutrition 38(3): 505-516. {a} International Rice Res. Inst., Los Banos, Laguna, Philippines

Ansari, M. A. and V. P. Sharma (1991). Role of Azolla in controlling mosquito breeding in Ghaziabad District villages (U.P.). Indian Journal Of Malariology 28(1): 51-54.

Erokhina, L. G. (1991). Composition and content of phycobiliproteins in symbiotic nitrogen-fixing cyanobacterium Anabaena azollae cells from various Azolla fern species. Fiziologiya Rastenii 38(4): 742-753.

Gebhardt, J. S. and B. S. A. Nierzwicki (1991). Identification of a common cyanobacterial symbiont associated with Azolla spp. through molecular and morphological characterization of free-living and symbiotic cyanobacteria. Applied And Environmental Microbiology 57(8): 2141-2146.

Kushari, D. P. and I. Watanabe (1991). Differential responses of Azolla to phosphorus deficiency: I. Screening methods in quantity controlled-condition. Soil Science And Plant Nutrition 37(2): 271-282.

Manna, A. B. and P. K. Singh (1991). Effects of nitrogen fertilizer application methods on growth and acetylene reduction activity of Azolla pinnata and yield of rice. Fertilizer Research 28(1): 25-30.

Pablico, P. P. and K. Moody (1991). Effect of fentin acetate on wet-seeded rice, Pistia stratiotes and Azolla pinnata. Crop Protection 10(1): 45-47.

Plazinski, J., L. Croft, et al. (1991). Indigenous plasmids in Anabaena azollae: Their taxonomic distribution and existence of regions of homology with symbiotic genes of Rhizobium. Canadian Journal Of Microbiology 37(3): 171-181.

Raven, J. A., C. Rothemund, et al. (1991). Acid-base regulation by Azolla spp. with dinitrogen as sole nitrogen source and with supplementation by ammonium or nitrate. Botanica Acta 104(2): 132-138.

Serdyuk, O. P., L. D. Smolygina, et al. (1991). Exometabolites with phytohormonal biological activity formed by the symbiotic association Azolla Anabaena azollae. Doklady Akademii Nauk Sssr 316(2): 492-494.

Watanabe, I., B. J. Padre, et al. (1991). Mineralization of azolla N and its availability to wetland rice: I. Nitrogen mineralization of different azolla species as affected by their chemical composition. Soil Science And Plant Nutrition 37(4): 679-688.

Watanabe, I., T. Yoneyama, et al. (1991). The contribution of atmospheric nitrogen to Azolla spp. grown on flooded soils. Soil Science And Plant Nutrition 37(1): 101-110.

Abbasi, S. A., P. C. Nipaney, et al. (1990). Bioenergy potential of eight common aquatic weeds. Biological Wastes 34(4): 359-366.

Jain, S. K., P. Vasudevan, et al. (1990). Azolla pinnata R.Br. and Lemna minor L. for removal of lead and zinc from polluted water. Water Research 24(2): 177-184.

Kannaiyan, S. (1990). Effect of sodium chloride on the growth, nitrogenase and photosynthesis of Azolla. Indian Journal Of Plant Physiology 33(2): 125-129.

Kolhe, S. S. and B. N. Mittra (1990). Azolla as an organic source of nitrogen in a rice-wheat cropping system. Tropical Agriculture 67(3): 267-269.

Laurinavichene, T. V., A. F. Yakunin, et al. (1990). Effect of temperature and photoperiod duration on growth and nitrogen fixation in Azolla. Fiziologiya Rastenii 37(2): 457-461.

Manna, A. B. and P. K. Singh (1990). Growth and nitrogen fixation of Azolla pinnata and Azolla caroliniana as affected by urea fertilizer and their influence on rice yield. Plant And Soil 122(2): 207-212.

Sarmah, B. K. and P. C. Deka (1990). Production of Anabaena free Azolla pinnata cultures by antibiotic treatment. Indian Journal Of Experimental Biology 28(3): 297-299.

Sisworo, E. L., D. L. Eskew, et al. (1990). Studies on the availability of Azolla nitrogen and urea nitrogen for rice growth using nitrogen-15. Plant And Soil 128(2): 209-220.

Sof'In, A. V., T. G. Didenko, et al. (1990). The molecular forms of glutamate dehydrogenase and glutamine synthetase in the nitrogen-fixing symbiotic Azolla and Anabaena associations. Biokhimiya 55(4): 634-644.

Solaiman, M. Z., M. Jahiruddin, et al. (1990). Effect of azolla and urea on nitrogen, phosphorus, potassium and sulfur content in rice. Pakistan Journal Of Scientific And Industrial Research 33(4): 155-158.

Stergianou, K. K. and K. Fowler (1990). Chromosome numbers and taxonomic implications in the fern genus Azolla (Azollaceae). Plant Systematics And Evolution 173(3-4): 223-240.

Watanabe, I. and C. Ramirez (1990). Phosphorus and nitrogen contents of azolla grown in the Philippines. Soil Science And Plant Nutrition 36(2): 319-332.

Dostalek, J., J. Kolbek, et al. (1989). A few taxa new to the flora of North Korea. Preslia 61(4): 323-327.

Idso, S. B., S. G. Allen, et al. (1989). Atmospheric carbon dioxide enrichment enhances survival of Azolla at high temperatures. Environmental And Experimental Botany 29(3): 337-342.

Jain, S. K., G. S. Gujral, et al. (1989). Uptake of heavy metals by Azolla pinnata and their translocation into fruit bodies of Pleurotus sajor caju. Journal Of Fermentation And Bioengineering 68(1): 64-67.

Jain, S. K., P. Vasudevan, et al. (1989). Removal of some heavy metals from polluted water by aquatic plants: Studies on duckweed and water velvet. Biological Wastes 28(2): 115-126.

Kondo, M., M. Kobayashi, et al. (1989). Effect of phosphorus on Azolla and its utilization in rice culture in Niger. Plant And Soil 120(2): 165-170.

Manna, A. B. and P. K. Singh (1989). Rice yields as influenced by Azolla nitrogen fixation and urea nitrogen-fertilization. Plant And Soil 114(1): 63-68.

Mian, M. H. and A. K. M. Azmal (1989). The response of Azolla pinnata R. Brown to the split application of phosphorus and the transfer of assimilated phosphorus to flooded rice plants. Plant And Soil 119(2): 211-216.

Nanda, D. R., B. B. Mishra, et al. (1989). Toxicity degradation of waste soil from a chlor-alkali factory by Azolla pinnata Lam. Plant And Soil 116(1): 103-106.

Nayak, S. K. and P. K. Singh (1989). Cytological studies in the genus Azolla. Cytologia 54(2): 275-286.

Nierzwicki, B. S. A., H. Aulfinger, et al. (1989). Ultrastructural characterization of an inner envelope that confines Azolla endosymbionts to the leaf cavity periphery. Canadian Journal Of Botany 67(9): 2711-2719.

Sah, R. N., S. S. Goyal, et al. (1989). Interaction effects of exogenous combined nitrogen and phosphorus on growth and nitrogen fixation by azolla. Plant And Soil 117(1): 1-8.

Sah, R. N., S. S. Goyal, et al. (1989). Effects of light on nitrate transport by Azolla pinnata. Journal Of Experimental Botany 40(214): 543-550.

Sah, R. N., S. S. Goyal, et al. (1989). Evaluation of isotopic dilution method for measuring nitrogen fixation in Azolla: Comparison with other methods. Journal Of Plant Nutrition 12(3): 341-362.

Singh, D. P. and P. K. Singh (1989). Effects of plot area and Azolla inocula on growth and nitrogen yield of Azolla pinnata when intercropped with rice. Acta Agronomica Hungarica 38(1-2): 99-104.

Singh, D. P. and P. K. Singh (1989). The response of rice to the growth and nitrogen fixation in Azolla caroliniana and Azolla pinnata at varying rates of phosphate fertilization. Plant And Soil 114(2): 205-210.

Singh, R. P. and P. K. Singh (1989). Effect of nitrogen fertilizers on nitrogen fixation and heterocyst frequency of cyanobacterium Anabaena azollae in 7 species of Azolla. Biochemie Und Physiologie Der Pflanzen 185(5-6): 429-433.

Sof'In, A. V., T. G. Didenko, et al. (1989). A technique for obtaining and prolonged cultivation of the water fern Azolla pinnata deprived of cyanobiont. Fiziologiya Rastenii 36(3): 616-621.

Stergianou, K. K. and K. Fowler (1989). Preliminary report of chromosome counts in the genus Azolla (Pteridophyta). Fern Gazette 13(5): 317-319.

Subraman, S. and S. Kannayan (1989). The effect of Azolla ferns on the enzyme activity of soil under rice. Mikrobiologiya 58(1): 118-121.

Taheruzzaman, Q. and D. P. Kushari (1989). Evaluation of some common aquatic macrophytes cultivated in enriched water as possible source of protein and biogas. Hydrobiological Bulletin 23(2): 207-212.

Van, C. D., I. Watanabe, et al. (1989). Sexual hybridization among Azolla species. Canadian Journal Of Botany 67(12): 3482-3485.

Allen, S. G., S. B. Idso, et al. (1988). Interactive effects of carbon dioxide and environment on photosynthesis of Azolla. Agricultural And Forest Meteorology 42(2-3): 209-218.

Allen, S. G., S. B. Idso, et al. (1988). Relationship between growth rate and net photosynthesis of Azolla in ambient and elevated carbon dioxide concentrations. Agriculture Ecosystems & Environment 20(2): 137-142.

Bari, G., A. Masood, et al. (1988). Effect of Azolla and nitrogenous fertilizer on yield performance of rice. Pakistan Journal Of Botany 20(1): 63-68.

Bekasova, O. D., A. A. Mutuskin, et al. (1988). Content and structural organization of phycobilin pigments in nitrogen-fixing cyanobacteria Anabaena azollae. Biofizika 33(2): 270-274.

Braun, H. E. B., P. Lindblad, et al. (1988). Dinitrogenase reductase (iron-protein) of nitrogenase in the cyanobacterial symbionts of three Azolla species: Localization and sequence of appearance during heterocyst differentiation. Planta 176(3): 319-332.

Idso, S. B. (1988). Three phases of plant response to atmospheric carbon dioxide enrichment. Plant Physiology 87(1): 5-7.

Jain, S. K., G. S. Gujral, et al. (1988). Cultivation of Pleurotus sajor caju on aquatic weeds. Aquatic Botany 30(3): 245-252.

Kannaiyan, S. and C. Somporn (1988). Studies on the growth nitrogen fixation, chlorophyll content and photosynthesis in Azolla. Indian Journal Of Plant Physiology 31(2): 134-139.

Manna, A. B. and P. K. Singh (1988). Effect of different nitrogen sources on growth, acetylene reduction activity of Azolla pinnata and yield of rice. Plant And Soil 107(2): 165-172.

Moretti, A. and G. S. Gigliano (1988). Influence of light and pH on growth and nitrogenase activity on temperate-grown Azolla. Biology And Fertility Of Soils 6(2): 131-136.

Nayak, S. K. and P. K. Singh (1988). Some variation in dermal appendages of Azolla. Indian Fern Journal 5(1-2): 170-175.

Rajendran, R. and R. Reuben (1988). Laboratory evaluation of the water fern, Azolla pinnata for mosquito control. Journal Of Biological Control 2(2): 114-116.

Rother, J. A., A. Aziz, et al. (1988). Ecology of deepwater rice-fields in Bangladesh: 4. Nitrogen fixation by blue-green algal communities. Hydrobiologia 169(1): 43-56.

Rother, J. A. and B. A. Whitton (1988). Mineral composition of Azolla pinnata in relation to composition of floodwaters in Bangladesh. Archiv Fuer Hydrobiologie 113(3): 371-380.

Saxena, D. K. and S. Kumar (1988). Effect of Azolla pinnata R. Br. on the growth of paddy. Acta Botanica Indica 16(2): 158-163.

Singh, A. L., P. K. Singh, et al. (1988). Effects of different levels of chemical nitrogen (urea) on Azolla and blue-green algae intercropping with rice. Fertilizer Research 17(1): 47-60.

Singh, A. L., P. K. Singh, et al. (1988). Effect of split application of phosphorus on the growth of Azolla and low land rice. Fertilizer Research 16(2): 109-118.

Singh, A. L., P. K. Singh, et al. (1988). Effects of different herbicides on the Azolla and blue-green algal biofertilization of rice. Journal Of Agricultural Science 111(3): 451-458.

Singh, A. L., P. K. Singh, et al. (1988). Effect of spacing and row orientation on the growth and nitrogen fixation of Azolla and their effects on rice. Journal Of Agricultural Science 110(3): 567-572.

Singh, D. P. and P. K. Singh (1988). Influence of rice crop canopy on growth and nitrogen fixation of water fern Azolla pinnata. Proceedings Of The Indian Academy Of Sciences Plant Sciences 98(3): 209-214.

Singh, D. P. and P. K. Singh (1988). Effects of phosphorus and carbofuran on the growth and nitrogen fixation of Azolla pinnata and the yield of rice. Experimental Agriculture 24(2): 183-190.

Singh, R. P. and P. K. Singh (1988). Symbiotic algal nitrogenase activity and heterocyst frequency in seven Azolla spp. after phosphorus fertilization. Hydrobiologia 169(3): 313-318.

Singh, R. P. and P. K. Singh (1988). Nitrogenase activity of Azolla pinnata R. Brown strains in symbiosis with cyanobacterium Anabaena azollae at different seasons. Biochemie Und Physiologie Der Pflanzen 183(1): 45-50.

Subramani, S. and S. Kannaiyan (1988). Effect of gypsum and lime application and Azolla pinnata inoculation on grain yield of rice. Tropical Agriculture 65(3): 226-228.

Sukumar, D., P. Subramaniyan, et al. (1988). Studies on the Azolla and nitrogen application on rice. Indian Journal Of Agronomy 33(4): 396-398.

Berliner, M. D. and R. W. Fisher (1987). Surface lectin binding to Anabaena variabilis and to cultured and freshly isolated Anabaena azollae. Current Microbiology 16(3): 149-152.

Berliner, M. D., F. D. Neely, et al. (1987). Spheroplast induction in Anabaena variabilis Kuetz and Anabaena azollae Stras. Protoplasma 139(1): 36-40.

Duivenvoorden, L. J. (1987). A centrifugation method for determining the fresh weight of aquatic macrophytes. Aquatic Botany 29(3): 275-282.

Idso, S. B., B. A. Kimball, et al. (1987). Effects of atmospheric carbon dioxide enrichment on plant growth: The interactive role of air temperature. Agriculture Ecosystems & Environment 20(1): 1-10.

Kannaiyan, S. and C. Somporn (1987). Studies on the effect of temperature on the growth and nitrogen fixation in four strains of Azolla pinnata R. Brown. Acta Botanica Indica 15(2): 196-201.

Kolhe, S. S. and B. N. Mittra (1987). Effect of azolla as an organic source of nitrogen in rice-wheat cropping system. Journal Of Agronomy And Crop Science 159(3): 212-215.

Kushari, D. P. and A. Sinhababu (1987). Seasonal effect of the leaf leaching of two trees on the growth of Azolla pinnata. Polskie Archiwum Hydrobiologii 34(2): 163-170.

McCowen, S. M., L. Macarthur, et al. (1987). Azolla fern lectins that specifically recognize endosymbiotic cyanobacteria. Current Microbiology 14(6): 329-334.

Petro, M. J. and J. E. Gates (1987). Distribution of Arthrobacter sp. in the leaf cavities of four species of the nitrogen-fixing Azolla fern. Symbiosis 3(1): 41-48.

Ruschel, A. P. (1987). Seasonal effect of growth and symbiotic nitrogen fixation of different Azolla species. Pesquisa Agropecuaria Brasileira 22(6): 559-566.

Sarkar, A. and S. Jana (1987). Effects of combinations of heavy metals on Hill activity of Azolla pinnata. Water Air And Soil Pollution 35(1-2): 141-146.

Siddiqi, M. A., M. Athar, et al. (1987). Effect of pH on the growth and biomass of Azolla pinnata under pot conditions. Pakistan Journal Of Scientific And Industrial Research 30(4): 301-302.

Singh, A. L. and P. K. Singh (1987). Comparative study on Azolla and blue-green algae dual culture with rice. Israel Journal Of Botany Basic And Applied Plant Sciences 36(2): 53-62.

Singh, A. L. and P. K. Singh (1987). Influence of Azolla management on the growth, yield of rice and soil fertility: I. Azolla growth, nitrogen fixation, and growth and yield of rice. Plant And Soil 102(1): 41-48.

Singh, A. L. and P. K. Singh (1987). The use of Azolla pinnata isolates as organic nitrogen sources for lowland rice (Oryza sativa). Experimental Agriculture 23(2): 159-166.

Singh, D. P. and P. K. Singh (1987). Effect of varying periods of inoculation of Azolla pinnata R. Brown on its growth, nitrogen fixation and response to rice crop. Plant And Soil 98(2): 257-264.

Singh, P. K., D. P. Singh, et al. (1987). The influence of fertilizers on sporocarp formation in Azolla pinnata. Proceedings Of The Indian Academy Of Sciences Plant Sciences 97(3): 223-226.

Singh, R. P. and P. K. Singh (1987). Growth and nitrogen-fixation of various Indian isolates of Azolla pinnata R. Br. under laboratory and field conditions. Proceedings Of The Indian Academy Of Sciences Plant Sciences 97(3): 227-230.

Subramani, S. and S. Kannaiyan (1987). Effect of incorporation and unincorporation of Azolla biofertilizer on the grain yield of rice. Journal Of Agronomy And Crop Science 159(5): 308-311.

Wong, F. S. H. W., V. V. Van, et al. (1987). Use of Azolla as a test organism in a growth chamber of simple design. Plant And Soil 99(2-3): 219-230.

Zheng, W. W., Y. H. Lin, et al. (1987). Scanning electron microscopic observation of symbiotic relationship of Azolla - Anabaena azollae during the vegetative growth. Acta Botanica Sinica 29(6): 588-593.

Antoine, T., S. Carraro, et al. (1986). Comparative appetency for Azolla of Cichlasoma and Oreochromis (tilapia). Aquaculture 53(2): 95-100.

Chakrabortty, M. and D. Kushari (1986). Influence of domestic sewage on growth and nitrogen fixation of Azolla pinnata. Aquatic Botany 24(1): 61-68.

Dey, J. N. and D. P. Kushari (1986). Effect of some physico-chemical factors on the growth and nitrogen fixation of two isolates of Azolla pinnata. Geobios 13(4): 151-155.

D'Souza, E. and R. M. Bourke (1986). Intensification of subsistence agriculture on the Nembi Plateau, Papua New Guinea: 2. Organic fertilizer trials. Papua New Guinea Journal Of Agriculture Forestry And Fisheries 34(1-4): 29-40.

Kaplan, D., H. E. Calvert, et al. (1986). The Azolla and Anabaena azollae relationship: XII. Nitrogenase activity and phycobiliproteins of the endophyte as a function of leaf age and cell type. Plant Physiology 80(4): 884-890.

Lumpkin, T. A. and D. P. Bartholomew (1986). Predictive models for the growth response of eight Azolla accessions to climatic variables. Crop Science 26(1): 107-111.

Sands, D. P. A. and R. C. Kassulke (1986). Assessment of Paulinia acuminata (Orthoptera: Acrididae) for the biological control of Salvinia molesta in Australia. Entomophaga 31(1): 11-18.

Sarkar, A. (1986). Effects of light intensity on growth of Azolla pinnata cultures in effluent collected from the Banka stream in West Bengal, India. Aquatic Botany 26(1-2): 189-194.

Sarkar, A. and S. Jana (1986). Heavy metal pollutant tolerance of Azolla pinnata. Water Air And Soil Pollution 27(1-2): 15-18.

Singh, A. L. and P. K. Singh (1986). Effect of carbofuran on the growth and nitrogen fixation of Azolla pinnata in rice field. Annals Of Biology 2(2): 155-160.

Singh, A. L. and P. K. Singh (1986). Comparative effects of Azolla pinnata and blue-green algae in combination with chemical nitrogen fertilizer on rice crop. Proceedings Of The Indian Academy Of Sciences Plant Sciences 96(2): 147-152.

Singh, A. L. and P. K. Singh (1986). Comparative studies on different methods of Azolla pinnata utilization in rice culture. Journal Of Agricultural Science 107(2): 273-278.

Singh, D. P. and P. K. Singh (1986). Growth and nitrogenase activity in Azolla species. Indian Journal Of Plant Physiology 29(1): 99-103.

Singh, D. P. and P. K. Singh (1986). Relative effects of Azolla pinnata and its combination with chemical nitrogen fertilizer on growth, yield and nitrogen uptake of rice (Oryza sativa). Journal Of Agricultural Science 106(1): 107-112.

Vu, V. V., F. S. H. W. Wong, et al. (1986). Effects of temperature, pH and bound nitrogen on photosynthesis and nitrogen fixation of Azolla pinnata and Azolla filiculoides. Photosynthetica 20(1): 67-73.

Wallace, W. H. and J. E. Gates (1986). Identification of eubacteria isolated from leaf cavities of four species of the nitrogen-fixing Azolla fern as Arthrobacter. Applied And Environmental Microbiology 52(3): 425-429.

Whitton, B. A. and H. D. Catling (1986). Algal ecology of deepwater rice-fields in Thailand. Archiv Fuer Hydrobiologie 105(3): 289-298.

Zheng, W., P. Lu, et al. (1986). The ultrastructures of Azolla and their Anabaena free culture. Journal Of Fujian Agricultural College 15(3): 211-219.

Arad, H., A. Keysari, et al. (1985). A comparison between cell antigens in different isolates of Anabaena azollae. Symbiosis 1(2): 195-204.

Ito, O. and I. Watanabe (1985). Availability to rice plants of nitrogen fixed by Azolla. Soil Science And Plant Nutrition 31(1): 91-104.

Kannaiyan, S. and S. Venkataramanan (1985). Influence of nitrogen and phosphorus fertilizers on ammonia-assimilating enzymes on Azolla. Plant And Soil 88(2): 271-274.

Satapathy, K. B. and P. K. Singh (1985). Control of weeds by Azolla pinnata in rice (Oryza sativa). Journal Of Aquatic Plant Management 23: 40-42.

Singh, A. and O. N. Srivastava (1985). Effect of light intensity on the growth of Azolla pinnata at Ranchi, India. Hydrobiologia 126(1): 49-52.

Singh, A. and O. N. Srivastava (1985). Effect of photoperiod on the growth of Azolla pinnata. Hydrobiologia 123(3): 211-214.

Tung, H. F. and T. C. Shen (1985). Studies of the Azolla pinnata and Anabaena azollae symbiosis: Concurrent growth of Azolla with rice. Aquatic Botany 22(2): 145-152.

Vincenzini, M., M. C. Margheri, et al. (1985). Outdoor mass culture of Azolla spp.: Yields and efficiencies of nitrogen fixation. Plant And Soil 86(1): 57-68.

Yakunin, A. F., T. Khoang, et al. (1985). Purification and properties of 2 ferredoxins from the water fern, Azolla pinnata. Biokhimiya 50(3): 514-520.

Ashton, P. J. and R. D. Walmsley (1984). The taxonomy and distribution of Azolla species in southern Africa. Botanical Journal Of The Linnean Society 89(3): 239-248.

Busby, C. H. and B. E. S. Gunning (1984). Microtubules and morphogenesis in stomata of the water fern, Azolla: An unusual mode of guard cell and pore development. Protoplasma 122(1-2): 108-119.

Chakravarty, T. K. (1984). Contribution of Azolla pinnata to the productivity of Hathkatora pond of Bhagalpur (India). Polskie Archiwum Hydrobiologii 31(1): 27-32.

Dang, S. N. and P. A. Kolesnikov (1984). Metabolism of ribose-5-phosphate in the association of Azolla fern and nitrogen-fixing cyanobacteria (Anabaena). Fiziologiya Rastenii 31(2): 288-293.

Ladha, J. K. and I. Watanabe (1984). Antigenic analysis of Anabaena azollae and the role of lectin in the Azolla - Anabaena symbiosis. New Phytologist 98(2): 295-300.

Singh, A. and O. N. Srivastava (1984). Effect of pesticides on the growth of Azolla pinnata. Indian Journal Of Ecology 11(1): 12-14.

Sinhababu, A. and D. Kushari (1984). Effect of leaf leachates of Polyalthia longifolia on the growth and nitrogen fixation of Azolla pinnata. Hydrobiological Bulletin 18(2): 103-108.

Sun, J. S., Z. Q. Zhu, et al. (1984). Electron microscopic observation of the Azolla - Anabaena azollae relationship. Acta Botanica Sinica 26(4): 343-348.

Talukdar, H. and H. P. Barthakur (1982). Biomass production of azolla and its effect on rice production. Journal Of Research Assam Agricultural University 3(2): 123-126.

Bekasova, O. D. and A. A. Muguskin (1972). Effect of exogenous 5-aminolevulinic acid on pigment metabolism in the symbiotic nitrogen-fixing Azolla pinnata Anabaena azollae association. Biokhimiya 53(12): 1972-1979.

Kolesnikov, P. A. and S. V. Zore (1488). Glycolate: Quinone-oxidoreductase in carbon dioxide- and nitrogen-assimilating system, Azolla fern and cyanobacterium Anabaena azollae. Doklady Akademii Nauk Sssr 287(6): 1488-1491.

Plazinski, J., Q. Zheng, et al. (1263). 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. Applied And Environmental Microbiology 56(5): 1263-1270.

Rusinova, N. G. and T. L. O. L. Le (1256). Activity and structural organization of ribulose bisphosphate carboxylase in Azolla and Anabaena azollae. Doklady Akademii Nauk Sssr 314(5): 1256-1259.

Uheda, E. (1187). Isolation of empty packets from Anabaena free Azolla pinnata var. imbricata. Plant And Cell Physiology 27(6): 1187-1190.

Sah, R. N., S. S. Goyal, et al. (1033). Phosphorus requirement of Azolla pinnata: Effects of low concentrations on growth and nitrogen fixation. Crop Science 29(4): 1033-1037.

Sevichan, P. J. and P. V. Madhusoodanan Comparative performance of three species of Azolla as a biofertilizer with different levels of chemical nitrogen fertilizer in the paddy fields. Journal of Economic and Taxonomic Botany 19(3): 683-686. Dep. Botany, Univ. Calicut, Calicut-673 635, India