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Hader, D.-P. ; Kumar, H.D. ; Smith, R. C. ; Worrest, R. C. (2007) Effects of solar UV radiation on aquatic ecosystems and interactions with climate change Photochemical & Photobiological Sciences, 6 (3). pp. 267-285. ISSN 1474-905X

Hader, Donat-Peter ; Kumar, H.D. ; Smith, Ray C. ; Worrest, Robert C. (2003) Aquatic ecosystems: effects of solar ultraviolet radiation and interactions with other climatic change factors Photochemical & Photobiological Sciences, 2 (1). pp. 39-50. ISSN 1474-905X

Parker, Dorothy L. ; Mihalick, Jennifer E. ; Plude, John L. ; Plude, Michelle J. ; Clark, Thomas P. ; Egan, Lynn ; Flom, Joshua J. ; Rai, L. C. ; Kumar, H. D. (2000) Sorption of metals by extracellular polymers from the cyanobacterium Microcystis aeruginosa fo. flos-aquae strain C3-40 Journal of Applied Phycology, 12 (3-5). pp. 219-224. ISSN 0921-8971

Thakur, A. ; Kumar, H. D. (1999) Nitrate, ammonium, and phosphate uptake by the immobilized cells of Dunaliella salina Bulletin of Environmental Contamination and Toxicology, 62 (1). pp. 70-78. ISSN 0007-4861

Parker, D. L. ; Kumar, H. D. ; Rai, L. C. ; Singh, J. B. (1997) Potassium salts inhibit growth of the cyanobacteria microcystis spp. in pond water and defined media: implications for control of microcystin-producing aquatic blooms Applied and Environmental Microbiology, 63 (6). pp. 2324-2329. ISSN 0099-2240

Singh, Jeet Bahadur ; Vyas, Deepak ; Kumar, Har Darshan (1997) Effects of amino acids, carbohydrates and phosphorus sources on growth and alkaline phosphatase activity of the marine cyanobacterium Journal of Microbiology and Biotechnology, 7 (2). pp. 127-131. ISSN 1017-7825

Kumar, Ashok ; Tyagi, Madhu B. ; Srinivas, Ganna ; Singh, Nilima ; Kumar, Har D. ; Sinha, Rajeshwar P. ; Hader, Donat-P. (1996) UVB shielding role of FeCI₃ and certain cyanobacterial pigments Photochemistry and Photobiology, 64 (2). pp. 321-325. ISSN 0031-8655

Sinha, R. P. ; Singh, N. ; Kumar, A. ; Kumar, H. D. ; Häder, M. ; Häder, D.-P. (1996) Effects of UV irradiation on certain physiological and biochemical processes in cyanobacteria Journal of Photochemistry and Photobiology B: Biology, 32 (1-2). pp. 107-113. ISSN 1011-1344

Sinha, R. P. ; Kumar, Lebert M. ; Kumar, A. ; Kumar, H. D. (1995) Disintegration of phycobilisomes in a rice field cyanobacterium Nostoc sp. following UV irradiation Biochemistry & Molecular Biology International, 37 (4). pp. 697-706. ISSN 1039-9712

Hader, Donat-P. ; Worrest, Robert C. ; Kumar, H. D. (1995) Effects of increased solar ultraviolet radiation on aquatic ecosystems Ambio Special Report, 24 (3). pp. 174-180. ISSN 0301-0325

Vyas, D. ; Kumar, H. D. (1995) Nitrogen fixation and hydrogen uptake in four cyanobacteria International Journal of Hydrogen Energy, 20 (2). pp. 163-168. ISSN 0360-3199

Sinha, R. P. ; Kumar, Lebert M. ; Kumar, A. ; Kumar, H. D. (1995) Effects of UV-B irradiation on growth, survival, pigmentation and nitrogen metabolism enzymes in cyanobacteria Acta Protozoologica, 34 (3). pp. 187-192. ISSN 0065-1583

Singh, Y. ; Kumar, H.D. (1994) Adaptation of a strain of Spirulina platensis to grow in cobalt-and iodine-enriched media Journal of Applied Microbiology, 76 (2). pp. 149-154. ISSN 1364-5072

Singh, Y. ; Kumar, H. D. (1994) Physiological characterization of chlorate-resistant mutants of the cyanobacterium Spirulina major Journal of Basic Microbiology, 34 (5). pp. 345-350. ISSN 0233-111X

Rathore, D. S. ; Kumar, A. ; Kumar, H. D. (1993) Lipid content and fatty acid composition in N₂- fixing cyanobacterium Anabaena doliolum as affected by molybdenum deficiency World Journal of Microbiology and Biotechnology, 9 (5). pp. 508-510. ISSN 0959-3993

Singh, J. B. ; Prasad, S. M. ; Rai, L. C. ; Kumar, H. D. (1993) Response of the cyanobacterium Nostoc muscorum to chromium and lead: the effect of phosphorus-metabolism Journal of General and Applied Microbiology, 39 (6). pp. 559-570. ISSN 0022-1260

Kumar, Dhruv ; Kumar, Har Darshan (1992) Hydrogen production by several cyanobacteria International Journal of Hydrogen Energy, 17 (11). pp. 847-852. ISSN 0360-3199

Dwivedi, Alka ; Kumar, H. D. ; Verma, S. K. ; Singh, H. N. (1992) pH Regulation of growth, photosynthesis, glutamine synthetase activity and micronutrient transport in the cyanobacterium Hapalosiphon welwitschii FEMS Microbiology Letters, 98 (1-3). pp. 241-244. ISSN 0014-5793

Tyagi, Rashmi ; Srinivas, G. ; Vyas, Deepak ; Kumar, Ashok ; Kumar, H. D. (1992) Differential effect of ultraviolet-B radiation on certain metabolic processes in a chromatically adapting Nostoc Photochemistry and Photobiology, 55 (3). pp. 401-407. ISSN 0031-8655

Kumar, D. ; Singh, J. B. ; Kumar, H. D. (1992) Effects of low temperature on two cyanobacteria Journal of General and Applied Microbiology, 38 (3). pp. 263-270. ISSN 0022-1260

Singh, Y. ; Kumar, H. D. (1992) Lipid and hydrocarbon production by Botryococcus spp. under nitrogen limitation and anaerobiosis World Journal of Microbiology and Biotechnology, 8 (2). pp. 121-124. ISSN 0959-3993

Banerjee, M. ; Kumar, H. D. (1992) Nitrogen fixation by Aulosira fertilissima in rice fields Naturalia, 17 . pp. 51-58. ISSN 0374-9991

Singh, A. K. ; Dwivedi, Alka ; Kumar, H. D. (1992) Phosphorus uptake by immobilized cells of the alkali-tolerant cyanobacterium oscillatoria amphibia ag. ex gomont Environmental Technology, 13 (1). pp. 89-94. ISSN 0959-3330

Singh, D. V. ; Tripathi, A. K. ; Kumar, H. D. (1991) Isolation and characterization of salinity resistant mutant of a nitrogen-fixing cyanobacterium, Anabaena doliolum Journal of Applied Microbiology, 71 (3). pp. 207-210. ISSN 1364-5072

Prasad, S. M. ; Singh, J. B. ; Rai, L. C. ; Kumar, H. D. (1991) Metal-induced inhibition of photosynthetic electron transport chain of the cyanobacterium Nostoc muscorum FEMS Microbiology Letters, 82 (1). pp. 95-100. ISSN 0014-5793

Rai, L. C. ; Mallick, Nirupama ; Singh, J. B. ; Kumar, H. D. (1991) Physiological and biochemical characteristics of a copper tolerant and a wild type strain of Anabaena doliolum under copper stress Journal of Plant Physiology, 138 (1). pp. 68-74. ISSN 0176-1617

Kumar, Dhruv ; Kumar, Har Darshan (1990) Effects of some inhibitors and carbon sources on acetylene reduction and hydrogen production of isolated heterocysts of Anabaena sp. (strain CA) European Journal of Phycology, 25 (4). pp. 375-379. ISSN 0967-0262

Kumar, Dhruv ; Kumar, Har Darshan (1990) Protection of nitrogenase levels in dark-incubated cultures of Anabaena sp. strain CA by various carbon sources, and restoration of nitrogenase activity by oxygen European Journal of Phycology, 25 (3). pp. 251-256. ISSN 0967-0262

Kumar, Dhruv ; Kumar, H. D. (1990) Nature of UV resistance in the cyanobacterium Nostoc linckia Current Science, 59 (8). pp. 412-414. ISSN 0011-3891

Kumar, D. ; Pandey, A. B. ; Kumar, H. D. (1990) Effect of some physiological factors on the nitrogenase and hydrogenase of the Azolla-Anabaena Azollae association International Journal of Hydrogen Energy, 15 (5). pp. 313-317. ISSN 0360-3199

Mishra, A. K. ; Pandey, A. B. ; Kumar, H. D. (1989) Effects of three pesticides on MSX-induced ammonia photoproduction by the cyanobacterium Nostoc linckia Ecotoxicology and Environmental Safety, 18 (2). pp. 145-148. ISSN 0147-6513

Ahluwalia, A. S. ; Kumar, H. D. (1989) Akinete formation and division in Anabaena oscillarioides (Cyanophyta, Nostocales) Microbios letters, 41 (2). pp. 87-94. ISSN 0307-5494

Banerjee, M. ; Kumar, A. ; Kumar, H. D. (1989) Factors regulating nitrogenase activity and hydrogen evolution in Azolla-anabaena symbiosis International Journal of Hydrogen Energy, 14 (12). pp. 871-879. ISSN 0360-3199

Rao, Roshini ; Kumar, H. D. (1989) Isolation and characterization of the heterocystous bluegreen alga Chlorogloeopsis fritschii from a eutrophic pond Microbios, 57 (230). pp. 7-13. ISSN 0026-2633

Banerjee, Meenakshi ; Kumar, H. D. (1988) Effect of carbon sources on growth and nitrogen fixation of Aulosira fertilissima Ghose Biochemie und Physiologie der Pflanzen (BPP), 183 (1). pp. 51-58. ISSN 0015-3796

Singh, Durg Vijai ; Kumar, Har Darshan (1988) Effect of methionine-sulfoximine on nitrate uptake and photosynthesis in the cyanobacterium Anabaena doliolum Bharadwaja Current Microbiology, 17 (1). pp. 1-4. ISSN 0343-8651

Kumar, D. ; Kumar, H. D. (1988) Light-dependent acetylene reduction and hydrogen production by the cyanobacterium, Anabaena sp. (strain CA) International Journal of Hydrogen Energy, 13 (9). pp. 573-575. ISSN 0360-3199

Banerjee, M. ; Kumar, H. D. (1987) Effect of light quality, anaerobiosis and glucose on nitrogen-fixation by the rice field cyanobacterium Aulosira fertilissima Ghose Acta Microbiologica Hungarica, 34 (1). pp. 57-63. ISSN 0231-4622

Rao, R. ; Banerjee, M. ; Kumar, A. ; Kumar, H. D. (1987) Hydrogen-supported nitrogenase activity in two cyanobacteria Current Microbiology, 16 (2). pp. 75-78. ISSN 0343-8651

Tripathi, A. K. ; Singh, D. V. ; Kumar, H. D. (1987) Isolation of mutants of Nostoc linckia resistant to DL-5-fluorotryptophan Microbios letters, 36 (143-144). pp. 121-127. ISSN 0307-5494

Tripathi, A. K. ; Kumar, H. D. (1986) Mutagenesis by ethidium bromide, proflavine and mitomycin C in the cyanobacterium Nostoc sp. Mutation Research Letters, 174 (3). pp. 175-178. ISSN 0165-7992

Gaur, J. P. ; Kumar, H. D. (1986) Effects of oil refinery effluents on Selenastrum capricornutum PRINTZ International Review of Hydrobiology, 71 (2). pp. 271-281. ISSN 1434-2944

Jha, Mahendra ; Kumar, Ashok ; Kumar, Har Darshan (1986) Stimulation of in vivo nitrate reductase activity in the thermal cyanobacterium Oscillatoria princeps under microaerobic conditions Current Microbiology, 14 (3). pp. 145-147. ISSN 0343-8651

Kumar, H. D. ; Jha, M. ; Kumar, A. (1986) Stimulation of nitrate reductase activity by blue light in a thermophilic cyanobacterium, Oscillatoria princeps British Phycological Journal, 21 (2). pp. 165-169. ISSN 0967-0262

Kumar, D. ; Jha, M. ; Kumar, H. D. (1985) Heavy-metal toxicity in the cyanobacterium Nostoc linckia Aquatic Botany, 22 (2). pp. 101-105. ISSN 0304-3770

Kumar, D. ; Jha, M. ; Kumar, H. D. (1985) Copper toxicity in the fresh water cyanobacterium Nostoc linckia Journal of General and Applied Microbiology, 31 (2). pp. 165-169. ISSN 0022-1260

Mishra, D. K. ; Jha, M. ; Kumar, H. D. (1985) Effects of different amino acids on growth and nitrogen fixation in Nostoc linckia Microbios letters, 28 (109). pp. 33-39. ISSN 0307-5494

Mishra, D. K. ; Kumar, H.D. ; Jha, M. (1985) Effects of some carbon sources on growth and nitrogen fixation in the cyanobacterium Nostoc linckia Biologia Plantarum, 27 (1). pp. 1-5. ISSN 0006-3134

Kumar, H. D. ; Tripathi, A. K. (1985) Isolation of a hydroxyproline-secreting pigment-deficient mutant of Nostoc sp. by metronidazole selection World Journal of Microbiology and Biotechnology, 1 (3). pp. 269-275. ISSN 0959-3993

Tripathi, A. K. ; Kumar, H. D. (1985) Transformation in the cyanobacterium Nostoc Biologisches Zentralblatt, 104 (3). pp. 239-243. ISSN 0006-3304

Gaur, J. P. ; Kumar, H. D. (1985) The influence of oil refinery effluents on the structure of algal communities Archiv für Hydrobiologie, 103 (3). pp. 305-323. ISSN 0003-9136

Nultsch, Wilhelm ; Kumar, Har Darshan (1984) Effects of quenching agents on the photodynamically-induced chemotactic response of the colorless flagellate Polytomella magna Photochemistry and Photobiology, 40 (4). pp. 539-543. ISSN 0031-8655

Kumar, D. ; Kumar, H. D. (1984) Effect of inhibitors on nitrogenase regulation in the cyanobacterium Nostoc linckia Biochemie und Physiologie der Pflanzen, 179 (7). pp. 623-629. ISSN 0015-3796

Mishra, D. K. ; Kumar, H.D. (1984) Effects of vanadium and tungsten on the nitrogen-fixing cyanobacterium Nostoc linckia Biologia Plantarum, 26 (6). pp. 448-454. ISSN 0006-3134

Kumar, H. D. ; Ueda, K. (1984) Induction of proheterocyst-like cells in Oscillatoria princeps by β-2-thienylalanine under microaerobic conditions Biochemie und Physiologie der Pflanzen (BPP), 179 (6). pp. 525-527. ISSN 0015-3796

Bhattacharya, M. ; Kaur, J. P. ; Ahluwalia, A. S. ; Raj, R. K. ; Kumar, H. D. (1983) Effect of exogenous addition of adenosine on some green algae and cyanobacteria Journal of the Indian Botanical Society, 62 (4). pp. 334-339. ISSN 0019-4468

Ahlunalia, A. S. ; Kumar, H. D. (1983) Isolation of mucilage-forming nitrogen-fixing blue-green alga Journal of the Indian Botanical Society, 62 (2). pp. 206-207. ISSN 0019-4468

Ahluwalia, A. S. ; Kumar, H.D. (1982) Cellular differentiation and nitrogenase activity in the cyanobacterium Anabaena Biologia Plantarum, 24 (2). pp. 136-141. ISSN 0006-3134

Rai, L. C. ; Gaur, J. P. ; Kumar, H.D. (1981) Protective effects of certain environmental factors on the toxicity of zinc, mercury, and methylmercury to Chlorella vulgaris Environmental Research, 25 (2). pp. 250-259. ISSN 0013-9351

Gaur, J. P. ; Kumar, H.D. (1981) Growth response of four micro-algae to three crude oils and a furnace oil Environmental Pollution Series A, Ecological and Biological, 25 (1). pp. 77-85. ISSN 0143-1471

Rai, L. C. ; Gaur, J. P. ; Kumar, H.D. (1981) Phycology and heavy-metal pollution Biological Reviews, 56 (2). pp. 99-151. ISSN 1464-7931

Kumar, A. ; Kumar, H. D. (1981) Canavanine-lnduced inhibition of growth and heterocyst differentiation in Anabaena doliolum and isolation of a canavanine-resistant mutant Journal of Biosciences, 3 (1). pp. 41-49. ISSN 0250-5991

Kumar, A. ; Kumar, H. D. (1981) Canavanine-lnduced inhibition of growth and heterocyst differentiation in Anabaena doliolum and isolation of a canavanine-resistant mutant Journal of Biosciences, 3 (1). pp. 41-49. ISSN 0250-5991

Kumar, H. D. ; Yadava, P. K. ; Gaur, J. P. (1981) Electrical flocculation of the unicellular green alga Chlorella vulgaris Beijerinck Aquatic Botany, 11 . pp. 187-195. ISSN 0304-3770

Kumar, Ashok ; Kumar, H. D. (1981) Response of a wild type and a non-nitrogen-fixing mutant of Anabaena doliolum towards different amino acids Zeitschrift für allgemeine Mikrobiologie, 21 (5). pp. 353-359. ISSN 0044-2208

Kumar, Ashok ; Kumar, H. D. (1980) Tungsten-induced inactivation of molybdoenzymes in Anabaena Biochimica et Biophysica Acta (BBA) - Enzymology, 613 (1). pp. 244-248. ISSN 0005-2744

Ahluwalia, A. S. ; Rai, R. K. ; Kumar, H. D. (1980) Chromatic adaptation and photoreversal in blue-green alga Calothrix clavata West Journal of Biosciences, 2 (1). pp. 63-68. ISSN 0250-5991

Kumar, A. ; Kumar, H. D. (1980) Differential effects of amino acid analogs on growth and heterocyst differentiation in two nitrogen-fixing blue-green algae Current Microbiology, 3 (4). pp. 213-218. ISSN 0343-8651

Ladha, J. K. ; Kumar, H.D. (1978) Genetics of blue-green algae Biological Reviews, 53 (3). pp. 355-386. ISSN 1464-7931

Agrawal, Manju ; Kumar, H. D. (1978) Effect of 7-azatryptophan on heterocyst differentiation in Anabaena doliolum Bharadwaja Proceedings of the Indian Academy of Sciences, Section B, 87 (1). pp. 31-39. ISSN 0370-0097

Kumar, H. D. ; Gupta, Manju (1978) Effects of cyclic nucleotides on morphogenesis in Nostoc muscorum Archives of Microbiology, 119 (2). pp. 183-186. ISSN 0302-8933

Kumar, H. D. ; Tyagi, M. B. (1978) Intergeneric transfer of streptomycin-resistance marker between two blue-green algae Proceedings of the Indian Academy of Sciences, Section B, 87 (4). pp. 225-230. ISSN 0370-0097

Kumar, H. D. ; Rai, L. C. (1978) Zirconium-induced precipitation of phosphate as a means of controlling eutrophication Aquatic Botany, 4 . pp. 359-366. ISSN 0304-3770

Ladha, J. K. ; Kumar, H. D. (1977) Response of a wild-type and a non-nitrogen-fixing mutant of Nostoc linckia to different carbon sources New Phytologist, 79 (2). pp. 299-308. ISSN 0028-646X

Rai, L. C. ; Kumar, H. D. (1977) Studies on the seasonal variation in the algal communities of pond polluted with fertilizer factory effluent [India] Indian Journal of Ecology, 4 (2). pp. 124-131. ISSN 0304-5250

singh, H. N. ; Ladha, J. K. ; Kumar, H. D. (1977) Genetic control of heterocyst formation in the blue-Green algae Nostoc muscorum and nostoc linckia Archives of Microbiology, 114 (2). pp. 155-159. ISSN 0302-8933

Ladha, J. K. ; Kumar, H. D. (1977) Some characteristics of two morphological mutants of Nostoc linckia induced by nitrosoguanidine Zeitschrift für Allgemeine Mikrobiologie, 17 (7). pp. 513-519. ISSN 0044-2208

Ladha, J. K. ; Kumar, H. D. (1977) Variability of nitrogen fixation in some isolates of Nostoc linckia Zeitschrift für Allgemeine Mikrobiologie, 17 (8). pp. 593-598. ISSN 0044-2208

Rai, L. C. ; Kumar, H. D. (1976) Nutrient uptake by Chlorella vulgaris and Anacystis nidulans isolated fromthe effluent of a fertilizer factory Indian Journal of Ecology, 3 (1). pp. 63-69. ISSN 0304-5250

Rai, L. C. ; Kumar, H. D. (1976) Systematic and ecological studies on algae of some habitats polluted with fertilizer factory effluent Nova Hedwigia, 27 (3-4). pp. 805-811. ISSN 0029-5035

Ladha, Jagdish k. ; Kumar, H. D. (1975) Developmental stages in a nonheterocystous filamentous cyanophyte New Phytologist, 74 (3). pp. 477-483. ISSN 0028-646X

Kumar, H. D. ; Gorham, P. R. (1975) Effects of acridine dyes and other substances on growth, lysis and toxicity of Anabaena flos-aquae Biochemie und Physiologie der Pflanzen, 167 (6). pp. 473-487. ISSN 0015-3796

Ladha, J. K. ; Kumar, H.D. (1975) Heterocyst division in two blue-green algae Archives of Microbiology, 102 (1). pp. 171-173. ISSN 0302-8933

Sharma, V. K. ; Kumar, H. D. (1975) Influence of pH and concentration of phosphate ions on growth and nitrogen fixation in a blue-green alga Cylindrospermum majus Cellular and Molecular Life Sciences, 31 (2). pp. 182-183. ISSN 1420-682X

Kumar, H. D. ; Sharma, Vasundhara ; Bisaria, G. P. (1975) Influence of ultraviolet irradiation on nutrient-gleaning capacity of two unicellular algae Zeitschrift für Allgemeine Mikrobiologie, 15 (5). pp. 333-337. ISSN 0044-2208

Kumar, H. D. ; Gorham, P. R. (1975) Production of nutritionally-deficient mutants of the axenic blue-green alga Anabaena flos-aquae NRC-44-1 by ultraviolet irradiation Zeitschrift für Allgemeine Mikrobiologie, 15 (5). pp. 379-381. ISSN 0044-2208

Rana, B. C. ; Kumar, H. D. (1974) Ecophysiological studies on the uptake of the pollutants, copper, zinc and phosphate, by certain algae Indian Journal of Ecology, 1 (1). pp. 1-11. ISSN 0304-5250

Rana, B. C. ; Kumar, H. D. (1974) Effects of toxic waste and waste water components on algae [India] Phykos, 13 (1). pp. 67-83. ISSN 0554-1182

Kumar, H. D. ; Sharma, Vasundhara ; Bisaria, G. P. (1974) Production of pollution-tolerant strains of unicellular algae through mutagenic treatment. I. Ethyl methane sulphonate Zeitschrift für Allgemeine Mikrobiologie, 14 (6). pp. 487-496. ISSN 0044-2208

Sharma, V. K. ; Kumar, H. D. (1973) Effects of azide, thioglycollic acid, and nitrosoguanidine on growth and nitrogen fixation in different clones of the blue-green alga Cylindrospermum majus Zeitschrift für Allgemeine Mikrobiologie, 13 (6). pp. 517-522. ISSN 0044-2208

Sinha, B. D. ; Kumar, H. D. (1973) A mutational study of the nitrogen-fixing blue-green alga Anabaena doliolum Annals of Botany, 37 (3). pp. 673-679. ISSN 0305-7364

Kumar, H. D. (1972) Mutagenic action of methyl methane sulphonate on the bluegreen alga Anacystis nidulans Zeitschrift für Allgemeine Mikrobiologie, 14 (5). pp. 371-382. ISSN 0044-2208

Madan, Vimla ; Kumar, H.D. (1971) Action of nalidixic acid and hydroxyurea on two blue-green algae Zeitschrift fur Allgemeine Mikrobiologie, 11 (6). pp. 495-499. ISSN 0044-2208

Singh, H. N. ; Kumar, H.D. (1971) Physiology of heterocyst production in the blue-green alga Anabaena doliolum I. Nitrate and light controls Zeitschrift fur Allgemeine Mikrobiologie, 11 (7). pp. 615-622. ISSN 0044-2208

Singh, H. N. ; Kumar, H.D. (1971) Physiology of heterocyst production in the blue-green alga Anabaena doliolum II. Effects of ultraviolet light Zeitschrift fur Allgemeine Mikrobiologie, 11 (7). pp. 623-626. ISSN 0044-2208

Srivastava, B. S. ; Kumar, H. D. (1971) Pigment variations in ultraviolet-treated strains of the blue-green alga Anabaena doliolum Archives of Microbiology, 77 (3). pp. 247-251. ISSN 0302-8933

Prakash, G. ; Kumar, H.D. (1971) Studies on sulphur-selenium antagonism in blue-green algae Archives of Microbiology, 77 (2). pp. 196-202. ISSN 0302-8933

Kumar, H. D. ; Prakash, G. (1971) Toxicity of selenium to the blue-green algae, Anacystis nidulans and Anabaena variabilis Annals of Botany, 35 (3). pp. 697-705. ISSN 0305-7364

Srivastava, B. S. ; Kumar, H.D. ; Singh, H. N. (1971) The effect of caffeine and light on killing of the blue-green alga Anabaena doliolum by ultraviolet radiation Archives of Microbiology, 78 (2). pp. 139-144. ISSN 0302-8933

Gupta, R. S. ; Kumar, H.D. (1970) Action of mutagenic chemicals on Anacystis nidulans. V. Diethyl sulphate Archives of Microbiology, 70 (4). pp. 313-329. ISSN 0302-8933

Kaushik, Madhubala ; Kumar, H. D. (1970) The effect of light on growth and development of two nitrogen fixing blue-green algae Archives of Microbiology, 74 (1). pp. 52-57. ISSN 0302-8933

Gupta, R. S. ; Kumar, H.D. (1970) The effect of maleic hydrazide on growth and mutation of a blue-green alga Archives of Microbiology, 70 (4). pp. 330-339. ISSN 0302-8933

Singh, M. K. ; Kumar, H.D. (1969) Action of hydroxyurea on Anabaena variabilis Archives of Microbiology, 67 (1). pp. 91-98. ISSN 0302-8933

Kumar, H. D. (1969) Action of mutagenic chemicals on Anacystis nidulans. IV. Acridine dyes Zeitschrift für Allgemeine Mikrobiologie, 9 (2). pp. 137-142. ISSN 0044-2208

Srivastava, B. S. ; Kumar, H. D. (1969) Inactivation and killing of the blue-green alga Anabaena doliolum grown on ultraviolet-irradiated culture medium Radiation Botany, 9 (4). pp. 291-295. ISSN 0033-7560

Kumar, H.D. (1968) Action of mutagenic chemicals on Anacystis nidulans. III. N-methyl-N'-nitro-N-nitrosoguanidine Archives of Microbiology, 63 (1). pp. 95-102. ISSN 0302-8933

Vyas, L. N. ; Kumar, H.D. (1968) Studies on the phytoplankton and other algae of Indrasagar tank, Udaipur, India Hydrobiologia, 31 (3-4). pp. 421-434. ISSN 0018-8158

Jain, P. K. ; Kumar, H. D. ; Singh, M. K. (1967) Adaptation of the blue-green alga Anabaena variabilis to hydroxylamine Plant and Cell Physiology, 8 (2). pp. 347-351. ISSN 0032-0781

Kumar, H.D. ; Singh, H. N. ; Prakash, Gyan (1967) The effect of proflavine on different strains of the blue-green alga Anacystis nidulans Plant and Cell Physiology, 8 (1). pp. 171-179. ISSN 0032-0781

Kumar , H. D. (1965) Effects of certain toxic chemicals and mutagens on the growth of the blue-green alga Anacystis nidulans Canadian Journal of Botany, 43 (12). pp. 1523-1532. ISSN 0008-4026

Fay, P. ; Kumar, H. D. ; Fogg, G. E. (1964) Cellular factors affecting nitrogen fixation in the blue-green alga Chlorogloea fritschii Microbiology, 35 (2). pp. 351-360. ISSN 1350-0872

Kumar, H.D. (1964) Adaptation of a blue-green alga to sodium selenate and chloramphenicol Plant & Cell Physiology, 5 (4). pp. 465-472. ISSN 0032-0781

Kumar, H. D. (1964) Adaptation of a blue-green alga to sodium selenate and chloramphenicol Plant and Cell Physiology, 5 (4). pp. 465-472. ISSN 0032-0781

Kumar, H.D. (1964) Effects of radiations on blue-green algae II. Effects in growth Annals of Botany, 28 (4). pp. 555-564. ISSN 0305-7364

Kumar, H.D. (1964) Streptomycin- and penicillin-induced inhibition of growth and pigment production in blue-green algae and production of strains of Anacystis nidulans resistant to these antibiotics Journal of Experimental Botany, 15 (2). pp. 232-250. ISSN 0022-0957

Kumar, H. D. (1962) Apparent genetic recombination in a blue-green alga Nature, 196 . 1121 - 1122. ISSN 0028-0836

Kumar, Har Darshan (1962) Observations on the developmental variability of Camptylonema lahorense Ghose Hydrobiologia, 20 (4). pp. 356-366. ISSN 0018-8158