Tanmay Bhattacharya - Academia.edu (original) (raw)
Papers by Tanmay Bhattacharya
African Journal of Biotechnology, 2007
Bacillus thuringiensis populations ranged between 4.23 x 105, 6.52 x 105 cfu/g soil and consist o... more Bacillus thuringiensis populations ranged between 4.23 x 105, 6.52 x 105 cfu/g soil and consist of 11 types of isolates with 3 polymorphic, 7 spherical and 1 bipyramidal type of crystals. Polymorphic crystal containing isolates were further characterized. B. thuringiensis isolates were circular, white, flat and undulate or entire. These were gram-positive. These tolerated 5% NaCl and failed to grow anaerobically. None of these were positive for indole production. All were sensitive to streptomycin, vancomycin, polymyxin B and norfloxacin but resistant to penicillin G and ampicillin/sulbactum. All of the isolates were crystal forming rods, width of rods was >0.9 um, catalase positive and sporangia were not swollen. All of the isolates hydrolyzed protein but only BTc 175 produced arginine dihydrolase, BTc 152 and BTc 175 produced urease.
Proceedings of the Zoological Society, 2009
During a taxonomic survey from March 2004 to February 2006, a total of 46 species of soil and pla... more During a taxonomic survey from March 2004 to February 2006, a total of 46 species of soil and plant parasitic nematodes, associated with banana plantations (Musa paradisiaca L. cv. Kanthali) have been encountered from different localities of Paschim Medinipur district of West Bengal, India. Of these, 29 species belonging to 21 genera were recorded under the order Dorylaimida and 17 species belonging to 11 genera were under the order Tylenchida. Most of the species are represented through female sex. The typical plant parasitic nematode genus Helicotylenchus Steiner, 1945 holds maximum number of species.
FIGURE 3. Macrobrachium ramae sp. nov. A.Tip of 2nd pereiopod of male,A.i.Sharp ridge; B.2nd pleo... more FIGURE 3. Macrobrachium ramae sp. nov. A.Tip of 2nd pereiopod of male,A.i.Sharp ridge; B.2nd pleopod,B.i.Appendix masculina, B.ii.Endopod; C.Tip of Appendix masculina,C i, iii. Long apical setae,C ii.Short apical setae; D.Chela of male 2nd pereiopod,D.i.Cutting edge without teeth; E.Colour of live; F.Mandibular palp,F.i.Apical segment,F.ii.Middle segment,F.iii. Basal segment.
<i>Macrobrachium ramae</i> sp. nov. (Fig. 1–3) <b>Materials examined</b>.... more <i>Macrobrachium ramae</i> sp. nov. (Fig. 1–3) <b>Materials examined</b>. Measurements (in mm), HOLOTYPE (1♂, Fig.1A): total length 44.0, carapace length 10.0, rostrum length 9.0, telson length 9.0. First pereiopod: ischium (i) = 2.6, merus (m) = 4.8, carpus (c)= 5.0, propodus (p) = 3.0, dactylus (d) = 1.5. Second pereiopod: i = 5, m = 5.8, c = 8.0, p = 9.0, d = 5.0. Third pereiopod: i = 3.5, m = 6.0, c = 3.0, p = 5.5, d = 2.0. Fourth pereiopod: i = 4.0, m = 6.2, c = 3.8, p = 7.5, d = 2.0. Fifth pereiopod: i = 4.0, m = 6.5, c = 4.0, p = 7.8, d = 2.8. ALLOTYPE (1♀ Fig.1B): total length 64.0, carapace length 16.0,rostrum length 12.0, telson length 10.0. First pereiopod: ischium (i) 4.0, merus (m) 7.0,carpus (c) 9.0, propodus (p) 4.5. dactylus (d) 2.5. Second pereiopod: i = 8.0, m = 9.0, c = 12.5, p = 13.5, d = 7.0. Third pereiopod: i = 3.8, m = 9.0, c = 3.8, p = 6.8, d = 2.5. Fourth pereiopod: i = 4.0, m = 9.0, c = 4.5, p = 8.5, d = 2.8. Fifth pereiopod: i = 4.0, m = 9.5, c = 4.8, p = 10.0, d = 3.0. PARATYPES: (based on 4 ♂) Total length 38–44, carapace length 9–10, rostrum length 8–14,telson length 6–9.5. First pereiopod: ischium (i) 2.0 –2.5; merus (m) 4.0–4.8, carpus (c) 6,0–7.5, propodus (p) 2.5–3.0; dactylus (d) 1.0–1.5. Second pereiopod: i = 4.5–5.0, m = 4.8–5.8, c = 7.2–8.0, p = 8.5–9.2, d = 4.75–5.0. Third pereiopod: i = 2.8–3.0, m = 5.5–6.0, c = 2.2–2.5, p = 4.5–5.5, d = 1.8–2.0. Fourth pereiopod: i = 3.0–3.5, m =5.0– 6.0, c = 2.5–3.0, p = 6.2–7.0, d = 1.5– 2.0. Fifth pereiopod: i = 3.5–3.8, m = 6.2–6.8, c = 3.75–4.5, p = 7.0–7.8, d = 2.0–2.8. (Based on 4 ♀) Total length 59.0–69.5, carapace length 16.0–18.0, rostrum length 11.5–14.0,telson length 8.5–10.0. First pereiopod: ischium (i) 4.5–4.8, merus (m) 6.8–7.0, carpus (c) 8.5–10.0, propodus (p) 4.25–5.0, dactylus (d)1.5–2.75. Second pereiopod: i = 6.75–8.0, m = 9.0–9.5, c = 12.0–14.0, p = 15.5–17.0, d = 7.5–8.2. Third pereiopod: i = 3.8–4.2, m = 8.0–10.0, c = 3.5–4.5, p = 7.0–8.0, d = 2.5–3.0. Fourth pereiopod: i = 4.0–4.5, m =9.0– 9.25, c = 4.0–4.5, p = [...]
Journal of BioMedical Research and Clinical Practice, 2018
A total of 50 water samples comprising; 20 well water, 15 sachet water, 10 borehole water and 5 r... more A total of 50 water samples comprising; 20 well water, 15 sachet water, 10 borehole water and 5 river water samples, were obtained from Wamakko, Dange-shuni and Wurno local government areas in Sokoto Central, Sokoto West and Sokoto East, Nigeria respectively between March and May 2015. They were analyzed using membrane filtration and pour plate techniques for faecal coliforms count and total coliform count respectively. The total coliform count for all the sources ranged between 0 and 3.28 × 102 with a total mean of 1.11 × 10,2 that of faecal coliform count was found to range between 0 and 92 with a mean total count of 12.58. Among the bacteria isolated and identified, Escherichia coli had the highest total prevalence of 233 (40.31%) and occurring in all the water samples. Klebsiella spp had 99 (17.13%) occurring in all the sources, Salmonella spp 43 (7.44%) occurring in all the sources except for borehole, Pseudomonas species 88 (15.22%) occurring in all the sources, Staphylococcus...
Oriental Insects, 1974
Three new species (Annectacarus, longlsetosus, Cryptacarus dendrisetosus, Papillacarus simplirost... more Three new species (Annectacarus, longlsetosus, Cryptacarus dendrisetosus, Papillacarus simplirostratus) and one new subspecies, Haplacarus foliatus bengalensis, all belonging to the family Lohmaniidae are described. In addition, two species are recorded for the first time from India, viz., Cryptacarus hirsutus Aoki, 1961 and Javacarus kuhnelti Balogh, 1961.
Journal of Entomological Research, 2021
The three spot gourami, Trichopodus trichopterus, an ornamental fish, consumed significantly more... more The three spot gourami, Trichopodus trichopterus, an ornamental fish, consumed significantly more larvae of Culex quinquefasciatus than Culex quinquefasciatus pupae and Chironomus ramosus larvae irrespective of whether those were offered as prey separately or together in paired combination. This fish predates significantly more number of prey during day time and has significantly higher dietary preference index for Culex quinquefasciatus larvae as compared to Culex quinquefasciatus pupae or Chironomus ramosus larvae. It appears to a very efficient biocontrol agent at least under laboratory condition.
CSI Transactions on ICT, 2016
CSI Transactions on ICT, 2016
Journal of Threatened Taxa
The present study recorded a total of 45 species of Odonata, of which one species, Ischnura mildr... more The present study recorded a total of 45 species of Odonata, of which one species, Ischnura mildredae, was recorded for the first time from West Bengal in India. Thirty-eight species were found in Tamluk Municipality as compared to 21 species in Haldia Industrial Belt (IB), with 14 species common to both the localities. Index of similarity revealed that the two localities were slightly dissimilar in odonate faunal composition as only 47% of species were shared. In both the localities, Anisoptera was more abundant, comprising over 69% of the total odonates. Libellulidae was the most abundant Anisopteran family in both the localities, comprising over 66% of the total odonates. Coenagrionidae was the most abundant Zygopteran family in both the localities. Thirteen species of Anisoptera and 11 species of Zygoptera were found only in Tamluk whereas two species of Anisoptera and five species of Zygoptera were found only in Haldia IB. Crocothemis servilia, Pantala flavescens, and Ce...
Science and Culture, 2003
An interesting α-amylase has been obtained in large quantity (2400 U/g of body weight) with speci... more An interesting α-amylase has been obtained in large quantity (2400 U/g of body weight) with specific activity (20.22 U/g protein) from a freshwater zooplankton, Heliodiaptomus viduus (Gurney). Partially purified enzyme showed activity up to 70 ºC and demonstrated optimum activity at 30 ºC. The enzyme was active between pH 3.5 and 8.5, with maximum activity at pH 6.0. It retained its full activity at 30 ºC for 2 h, but became inactive at 60 ºC after 2 h, and at 70 ºC after 1 h. Enzyme activity was retained at 60% in 2 M NaCl after 24 h incubation, while full activity was found in 0.5 M NaCl for the same duration of incubation. Addition of metal ions like Fe 2+ , Ba 2+ , Co 2+ , Ag 2+ , and Mn 2+ enhanced activity up to 130%-200% of the original activity, while K + and Sn 2+ caused a negligible increase in the activity. Addition of Hg 2+ and Li 2+ completely inhibited amylase activity, whereas Cu 2+ , Mg 2+ , and Pb 2+ reduced activity to as little as 5% of original activity. Soluble starch, amylose, and amylopectin were completely digested by this amylase, whereas glycogen was hydrolyzed to a lesser extent. During hydrolysis of soluble starch, initially, maltose (G 2 ) and maltotetraose (G 4 ) were produced in similar magnitude, followed by a distinctly higher amount (> 80%) of maltose. Amylose was the most potential substrate with a K m value of 1.82 mg/ml. The molecular mass was 50 kDa in the Native PAGE and no multiple forms were observed.
Mitteilungen aus dem Museum für Naturkunde in Berlin. Zoologisches Museum und Institut für Spezielle Zoologie 〈Berlin〉, 1981
This paper contains the description of a new oribatid mite Aenppra nzitzuta gen. et
Primates, 1990
ABSTRACT. The Phayre's leaf monkey occurs in India only in Tripura and South Cachar hill... more ABSTRACT. The Phayre's leaf monkey occurs in India only in Tripura and South Cachar hills. Identification of sex with the help of markings on the face in adult individuals has been suggested in this paper. ... Key Words: Phayre's leaf monkey: Sexual dimorphism; Facial marks; ...
Fragmenta Faunistica, 2011
A new nematode species belonging to the family Dorylaimidae of the order Dorylaimida has been col... more A new nematode species belonging to the family Dorylaimidae of the order Dorylaimida has been collected from rhizospheric soil of banana plantation from west Bengal, India. Laimydorus minutus sp. n. is described and illustrated. A key for females of species in the genera Prodorylaimus Andrássy 1959 and Laimydorus Siddiqi 1969 is also provided.
African Journal of Biotechnology, 2007
Bacillus thuringiensis populations ranged between 4.23 x 105, 6.52 x 105 cfu/g soil and consist o... more Bacillus thuringiensis populations ranged between 4.23 x 105, 6.52 x 105 cfu/g soil and consist of 11 types of isolates with 3 polymorphic, 7 spherical and 1 bipyramidal type of crystals. Polymorphic crystal containing isolates were further characterized. B. thuringiensis isolates were circular, white, flat and undulate or entire. These were gram-positive. These tolerated 5% NaCl and failed to grow anaerobically. None of these were positive for indole production. All were sensitive to streptomycin, vancomycin, polymyxin B and norfloxacin but resistant to penicillin G and ampicillin/sulbactum. All of the isolates were crystal forming rods, width of rods was >0.9 um, catalase positive and sporangia were not swollen. All of the isolates hydrolyzed protein but only BTc 175 produced arginine dihydrolase, BTc 152 and BTc 175 produced urease.
Proceedings of the Zoological Society, 2009
During a taxonomic survey from March 2004 to February 2006, a total of 46 species of soil and pla... more During a taxonomic survey from March 2004 to February 2006, a total of 46 species of soil and plant parasitic nematodes, associated with banana plantations (Musa paradisiaca L. cv. Kanthali) have been encountered from different localities of Paschim Medinipur district of West Bengal, India. Of these, 29 species belonging to 21 genera were recorded under the order Dorylaimida and 17 species belonging to 11 genera were under the order Tylenchida. Most of the species are represented through female sex. The typical plant parasitic nematode genus Helicotylenchus Steiner, 1945 holds maximum number of species.
FIGURE 3. Macrobrachium ramae sp. nov. A.Tip of 2nd pereiopod of male,A.i.Sharp ridge; B.2nd pleo... more FIGURE 3. Macrobrachium ramae sp. nov. A.Tip of 2nd pereiopod of male,A.i.Sharp ridge; B.2nd pleopod,B.i.Appendix masculina, B.ii.Endopod; C.Tip of Appendix masculina,C i, iii. Long apical setae,C ii.Short apical setae; D.Chela of male 2nd pereiopod,D.i.Cutting edge without teeth; E.Colour of live; F.Mandibular palp,F.i.Apical segment,F.ii.Middle segment,F.iii. Basal segment.
<i>Macrobrachium ramae</i> sp. nov. (Fig. 1–3) <b>Materials examined</b>.... more <i>Macrobrachium ramae</i> sp. nov. (Fig. 1–3) <b>Materials examined</b>. Measurements (in mm), HOLOTYPE (1♂, Fig.1A): total length 44.0, carapace length 10.0, rostrum length 9.0, telson length 9.0. First pereiopod: ischium (i) = 2.6, merus (m) = 4.8, carpus (c)= 5.0, propodus (p) = 3.0, dactylus (d) = 1.5. Second pereiopod: i = 5, m = 5.8, c = 8.0, p = 9.0, d = 5.0. Third pereiopod: i = 3.5, m = 6.0, c = 3.0, p = 5.5, d = 2.0. Fourth pereiopod: i = 4.0, m = 6.2, c = 3.8, p = 7.5, d = 2.0. Fifth pereiopod: i = 4.0, m = 6.5, c = 4.0, p = 7.8, d = 2.8. ALLOTYPE (1♀ Fig.1B): total length 64.0, carapace length 16.0,rostrum length 12.0, telson length 10.0. First pereiopod: ischium (i) 4.0, merus (m) 7.0,carpus (c) 9.0, propodus (p) 4.5. dactylus (d) 2.5. Second pereiopod: i = 8.0, m = 9.0, c = 12.5, p = 13.5, d = 7.0. Third pereiopod: i = 3.8, m = 9.0, c = 3.8, p = 6.8, d = 2.5. Fourth pereiopod: i = 4.0, m = 9.0, c = 4.5, p = 8.5, d = 2.8. Fifth pereiopod: i = 4.0, m = 9.5, c = 4.8, p = 10.0, d = 3.0. PARATYPES: (based on 4 ♂) Total length 38–44, carapace length 9–10, rostrum length 8–14,telson length 6–9.5. First pereiopod: ischium (i) 2.0 –2.5; merus (m) 4.0–4.8, carpus (c) 6,0–7.5, propodus (p) 2.5–3.0; dactylus (d) 1.0–1.5. Second pereiopod: i = 4.5–5.0, m = 4.8–5.8, c = 7.2–8.0, p = 8.5–9.2, d = 4.75–5.0. Third pereiopod: i = 2.8–3.0, m = 5.5–6.0, c = 2.2–2.5, p = 4.5–5.5, d = 1.8–2.0. Fourth pereiopod: i = 3.0–3.5, m =5.0– 6.0, c = 2.5–3.0, p = 6.2–7.0, d = 1.5– 2.0. Fifth pereiopod: i = 3.5–3.8, m = 6.2–6.8, c = 3.75–4.5, p = 7.0–7.8, d = 2.0–2.8. (Based on 4 ♀) Total length 59.0–69.5, carapace length 16.0–18.0, rostrum length 11.5–14.0,telson length 8.5–10.0. First pereiopod: ischium (i) 4.5–4.8, merus (m) 6.8–7.0, carpus (c) 8.5–10.0, propodus (p) 4.25–5.0, dactylus (d)1.5–2.75. Second pereiopod: i = 6.75–8.0, m = 9.0–9.5, c = 12.0–14.0, p = 15.5–17.0, d = 7.5–8.2. Third pereiopod: i = 3.8–4.2, m = 8.0–10.0, c = 3.5–4.5, p = 7.0–8.0, d = 2.5–3.0. Fourth pereiopod: i = 4.0–4.5, m =9.0– 9.25, c = 4.0–4.5, p = [...]
Journal of BioMedical Research and Clinical Practice, 2018
A total of 50 water samples comprising; 20 well water, 15 sachet water, 10 borehole water and 5 r... more A total of 50 water samples comprising; 20 well water, 15 sachet water, 10 borehole water and 5 river water samples, were obtained from Wamakko, Dange-shuni and Wurno local government areas in Sokoto Central, Sokoto West and Sokoto East, Nigeria respectively between March and May 2015. They were analyzed using membrane filtration and pour plate techniques for faecal coliforms count and total coliform count respectively. The total coliform count for all the sources ranged between 0 and 3.28 × 102 with a total mean of 1.11 × 10,2 that of faecal coliform count was found to range between 0 and 92 with a mean total count of 12.58. Among the bacteria isolated and identified, Escherichia coli had the highest total prevalence of 233 (40.31%) and occurring in all the water samples. Klebsiella spp had 99 (17.13%) occurring in all the sources, Salmonella spp 43 (7.44%) occurring in all the sources except for borehole, Pseudomonas species 88 (15.22%) occurring in all the sources, Staphylococcus...
Oriental Insects, 1974
Three new species (Annectacarus, longlsetosus, Cryptacarus dendrisetosus, Papillacarus simplirost... more Three new species (Annectacarus, longlsetosus, Cryptacarus dendrisetosus, Papillacarus simplirostratus) and one new subspecies, Haplacarus foliatus bengalensis, all belonging to the family Lohmaniidae are described. In addition, two species are recorded for the first time from India, viz., Cryptacarus hirsutus Aoki, 1961 and Javacarus kuhnelti Balogh, 1961.
Journal of Entomological Research, 2021
The three spot gourami, Trichopodus trichopterus, an ornamental fish, consumed significantly more... more The three spot gourami, Trichopodus trichopterus, an ornamental fish, consumed significantly more larvae of Culex quinquefasciatus than Culex quinquefasciatus pupae and Chironomus ramosus larvae irrespective of whether those were offered as prey separately or together in paired combination. This fish predates significantly more number of prey during day time and has significantly higher dietary preference index for Culex quinquefasciatus larvae as compared to Culex quinquefasciatus pupae or Chironomus ramosus larvae. It appears to a very efficient biocontrol agent at least under laboratory condition.
CSI Transactions on ICT, 2016
CSI Transactions on ICT, 2016
Journal of Threatened Taxa
The present study recorded a total of 45 species of Odonata, of which one species, Ischnura mildr... more The present study recorded a total of 45 species of Odonata, of which one species, Ischnura mildredae, was recorded for the first time from West Bengal in India. Thirty-eight species were found in Tamluk Municipality as compared to 21 species in Haldia Industrial Belt (IB), with 14 species common to both the localities. Index of similarity revealed that the two localities were slightly dissimilar in odonate faunal composition as only 47% of species were shared. In both the localities, Anisoptera was more abundant, comprising over 69% of the total odonates. Libellulidae was the most abundant Anisopteran family in both the localities, comprising over 66% of the total odonates. Coenagrionidae was the most abundant Zygopteran family in both the localities. Thirteen species of Anisoptera and 11 species of Zygoptera were found only in Tamluk whereas two species of Anisoptera and five species of Zygoptera were found only in Haldia IB. Crocothemis servilia, Pantala flavescens, and Ce...
Science and Culture, 2003
An interesting α-amylase has been obtained in large quantity (2400 U/g of body weight) with speci... more An interesting α-amylase has been obtained in large quantity (2400 U/g of body weight) with specific activity (20.22 U/g protein) from a freshwater zooplankton, Heliodiaptomus viduus (Gurney). Partially purified enzyme showed activity up to 70 ºC and demonstrated optimum activity at 30 ºC. The enzyme was active between pH 3.5 and 8.5, with maximum activity at pH 6.0. It retained its full activity at 30 ºC for 2 h, but became inactive at 60 ºC after 2 h, and at 70 ºC after 1 h. Enzyme activity was retained at 60% in 2 M NaCl after 24 h incubation, while full activity was found in 0.5 M NaCl for the same duration of incubation. Addition of metal ions like Fe 2+ , Ba 2+ , Co 2+ , Ag 2+ , and Mn 2+ enhanced activity up to 130%-200% of the original activity, while K + and Sn 2+ caused a negligible increase in the activity. Addition of Hg 2+ and Li 2+ completely inhibited amylase activity, whereas Cu 2+ , Mg 2+ , and Pb 2+ reduced activity to as little as 5% of original activity. Soluble starch, amylose, and amylopectin were completely digested by this amylase, whereas glycogen was hydrolyzed to a lesser extent. During hydrolysis of soluble starch, initially, maltose (G 2 ) and maltotetraose (G 4 ) were produced in similar magnitude, followed by a distinctly higher amount (> 80%) of maltose. Amylose was the most potential substrate with a K m value of 1.82 mg/ml. The molecular mass was 50 kDa in the Native PAGE and no multiple forms were observed.
Mitteilungen aus dem Museum für Naturkunde in Berlin. Zoologisches Museum und Institut für Spezielle Zoologie 〈Berlin〉, 1981
This paper contains the description of a new oribatid mite Aenppra nzitzuta gen. et
Primates, 1990
ABSTRACT. The Phayre's leaf monkey occurs in India only in Tripura and South Cachar hill... more ABSTRACT. The Phayre's leaf monkey occurs in India only in Tripura and South Cachar hills. Identification of sex with the help of markings on the face in adult individuals has been suggested in this paper. ... Key Words: Phayre's leaf monkey: Sexual dimorphism; Facial marks; ...
Fragmenta Faunistica, 2011
A new nematode species belonging to the family Dorylaimidae of the order Dorylaimida has been col... more A new nematode species belonging to the family Dorylaimidae of the order Dorylaimida has been collected from rhizospheric soil of banana plantation from west Bengal, India. Laimydorus minutus sp. n. is described and illustrated. A key for females of species in the genera Prodorylaimus Andrássy 1959 and Laimydorus Siddiqi 1969 is also provided.