Attempts to transmit Babesia equi in laboratory animals.     

D V Malhotra  O P Gautam  D P Banerjee 《Tropical animal health and production》1979,11(2):95-97

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Diel cyclic hypoxia alters plasma lipid dynamics and impairs reproduction in goldfish (<Emphasis Type="Italic">Carassius auratus</Emphasis>)     

Aritra Bera  Paramita Banerjee Sawant  Subrata Dasgupta  N. K. Chadha  Bhawesh T. Sawant  Asim Kumar Pal 《Fish physiology and biochemistry》2017,43(6):1677-1688

Diel cyclic hypoxia occurs with varying frequency and duration in freshwater habitats, yet little is known about its effects on reproduction of freshwater fishes. The present study shows that long-term exposure of goldfish (Carassius auratus) to cyclic hypoxia (0.8 ± 0.2 mg/l dissolved oxygen) for 9 h or more, per day, altered plasma lipid and sex steroid profiles, which in turn directly or indirectly suppressed ovarian growth and viable spermatozoa production. Hypoxia decreased total cholesterol and high density lipoprotein (HDL p < 0.05) and elevated triglycerides (TG; p < 0.05) in both sexes. Plasma steroid concentrations particularly of 17α-hydroxyprogesterone (17-HP), estradiol (E2), testosterone (T) in females, and T and 11-ketotestosterone (11-KT) in males were attenuated under diel hypoxic conditions. Intriguingly, both diel and continuous hypoxia elevated plasma E2 and vitellogenin levels in males. However, neither lipid nor steroid profiles recorded any variation in a dose-dependent manner in response to diel hypoxia. The reduced GSI, decreased number of tertiary oocytes, and motile spermatozoa in hypoxic fish clearly indicate suppression of gametogenesis. Thereby, prolonged diel cyclic hypoxia may affect valuable fishery resources and fish population structure by impairing reproductive performances and inducing estrogenic effects in males.  相似文献   

A computable general equilibrium analysis of forest concessions in Brazil     

Onil Banerjee  Janaki Alavalapati 《Forest Policy and Economics》2009,11(4):244-252

The management of natural forests in Brazil is concentrated in the states of the Legal Amazon with almost all legal timber extraction occurring on private land. While the government has historically promoted the development of forest plantations through economic incentives, state involvement with natural forests has focused on regulation. Over 1 million km² in the Legal Amazon have been identified as suitable for the production of forest goods and services and other resource-based activities (Veríssimo et al., 2000, p. 6). Only recently, however, has the state taken action to harness the potential this vast public resource holds for promoting sustainable development. In March 2006, the Public Forest Management Law was passed by the government of President Luiz Inácio Lula da Silva. A key feature of this law is a framework for creating forest concessions on public lands. With the goal of establishing up to 13 million ha of forest concessions by the end of the decade, such an initiative for the development of the forest sector is unprecedented in Brazilian history, marking the state's recognition of the Amazon's vocation as one of forest-based development.A static computable general equilibrium (CGE) model is developed to evaluate the short-run socio-economic and environmental implications of implementing forest concessions in the Brazilian Amazon. Results indicate that household income and private consumption increase with the implementation of forest concessions. With the expansion of natural forest management in the north, forest plantations contract significantly in all regions and to a lesser degree, natural forest management in the north east and center west. As forest plantations demand less agricultural land for production, the price of agricultural land decreases and the excess supply is taken up by the agricultural sector which pays less for the land and consequently produces more of a less expensive product. The implementation of forest concessions results in a 3.8% increase in legal deforestation with the largest increase in the north, followed by the north east and center west.  相似文献   

Deviation of habitat salinity during seasonal gonad recrudescence affects plasma sex steroid levels and suppresses gonadal maturation in an euryhaline fish Etroplus suratensis          下载免费PDF全文

Babita Mandal  Paramita Banerjee Sawant  Subrata Dasgupta  Narinder Kumar Chadha  Jitendra Kumar Sundaray  Bhawesh T Sawant  Aritra Bera 《Aquaculture Research》2017,48(12):5973-5983

Impact of osmoregulation on plasma sex steroid levels and gonadal histo‐architecture was monitored to elucidate the effects of deviation from habitat salinity on gonadal recrudescence in an active reproductive season of an euryhaline fish Etroplus suratensis (pearlspot). Fish were maintained in three different salinities of 0 ppt Fresh Water (FW), 15 ppt Brackish Water (BW) and 30 ppt Sea Water (SW) for a period of 60 days. Plasma osmolality values were found to be significantly highest in SW‐acclimated fish accompanied by highest levels of plasma K? and Cl¯ ions. The progress of gonadal recrudescence was higher in BW followed by FW and SW as evident from the cellular features of gonads and increased level of plasma sex steroids, such as, in case of female and 11‐keto Testosterone and Testosterone in case of males. Plasma cortisol levels were comparatively higher in fish of both sexes in SW group. Significantly high levels of cortisol in SW suggest its role in hypo‐osmoregulation and associated stress. This study clearly reveals that salinity changes during the active reproductive phase can suppress the steroid‐mediated gonad recrudescence maximally under hypo‐osmoregulation in an euryhaline fish.  相似文献   

Photodegradation of fenarimol     

Nivedita Sur  Srikumar Pal  Hemanta Banerjee  Narayan Adityachaudhury  Anjan Bhattacharyya 《Pest management science》2000,56(3):289-292

The photodegradation of aqueous alcoholic solutions of fenarimol at λ ≥ 250 nm has been examined. UV irradiation of an aqueous methanolic solution for 24 h yielded two photoproducts, identified as 2,4′‐dichlorobenzil and p‐chlorobenzoic acid, while irradiation of a solution in aqueous isopropanol yielded p‐chlorobenzoic acid and two additional products identified as 2,4′‐dichlorobenzophenone and o‐chlorobenzoic acid. A mechanism for the formation of the photoproducts is suggested. © 2000 Society of Chemical Industry  相似文献   

Sedimentary records and luminescence chronology of Late Holocene palaeofloods in the Luni River, Thar Desert, northwest India   总被引：2，自引：0，他引：2  

Vishwas S. Kale  Ashok K. Singhvi  Praveen K. Mishra  Debabrata Banerjee 《CATENA》2000,40(4)

River Luni is the only well-integrated river system in the Thar Desert of India. This river catastrophically flooded due to unusually heavy rainfall in the catchment area during July 1979. In order to establish whether floods of this magnitude have occurred in the recent geological past, sedimentary records of palaeofloods occurring in the Sindari Gorge, in the lower Luni Basin were investigated. The principal slackwater flood deposits were observed in a back-flooded tributary near Bhuka. Analysis of the slackwater flood deposits preserved in the back-flooded tributary and their luminescence dating suggests that the Luni River has experienced at least 17 extreme floods during the past millennium. Evidence from the Bhuka site also suggests that no floods comparable in magnitude to the July 1979 megaflood have occurred during this period. This observation is in conformity with the palaeoflood record of central India. Comparison of the long-term monsoon rainfall series for the Luni Basin and the Indian region reveals a clear link between the two, and indicates that the clustering of large floods in the last few decades and during the Medieval warming period is a regional phenomenon associated with wetter conditions. This correlates with a regionally extended episode of landscape stability denoted by stabilization of dunes in this region.  相似文献   

Enhancement of <Emphasis Type="Italic">Penaeus monodon</Emphasis> shrimp postlarvae growth and survival without water exchange using marine <Emphasis Type="Italic">Bacillus pumilus</Emphasis> and periphytic microalgae     

Sanjoy Banerjee  Helena Khatoon  Mohamed Shariff  Fatimah Md. Yusoff 《Fisheries Science》2010,76(3):481-487

We have investigated the possibility of using a consortium of marine bacterium and periphytic microalgae to improve the water quality and increase the growth and survival of the shrimp Penaeus monodon in a hatchery system. Three treatments were evaluated for their effect on P. monodon postlarvae (PL) when the culture water was not changed: Bacillus pumilus alone (B); periphytic microalgae alone (M); B. pumilus + periphytic microalgae (BM). P. monodon PL raised in a tank of unchanged water without bacterium and periphytic microalgae served as the control. The water in tanks of the M and BM treatments had significantly low levels of total ammonia-nitrogen (TAN) (0.03 and 0.01 mg l⁻¹, respectively) and nitrite-nitrogen (NO₂-N) (0.03, 0.01 mg l⁻¹, respectively) than that in the B (TAN 0.80, NO₂-N 0.68 mg l⁻¹) and control (TAN 1.11, NO₂-N 1.12 mg l⁻¹) tanks. Moreover, PL cultured in tanks M and BM had significantly higher survival and specific growth rates and a significantly higher resistance to the reverse salinity stress test than those in the B and control tanks. Compared to the control PL, the PL cultured in the BM tanks had significantly higher levels of protein, lipid, polyunsaturated fatty acids, ecosapentaenoic acid, and docosahexaenoic acid. The culture water in tanks BM also contained significantly less Vibrio than the control water. Our results illustrate the beneficial effects of a B. pumilus and periphytic microalgae consortium on improving the water quality and the growth and survival of shrimp PL grown in a hatchery system.  相似文献   

Association analysis of yield and fibre quality characters in interspecific population of cotton (Gossypium spp.)     

Santoshkumar Magadum  Urbi Banerjee  Rajasekaran Ravikesavan  Krishnasamy Thiyagu  Narayanan Manikanda Boopathi  Sankaran Rajarathinam 《Journal of Crop Science and Biotechnology》2012,15(3):239-243

Seed cotton yield and fibre quality are controlled by polygenes and highly influenced by the environment. Hence, selection merely based on yield is not effective. In order to enhance the yield potential of the cotton varieties, an understanding of the relationship among different characters is of more importance. Knowledge on the direct contribution of different characters to yield would be highly important for formulating a selection programme. Correlation and path coefficient analysis were carried out using 62 progenies of an interspecific backcross population (Gossypium hirsutum L. var. KC 3 x Gossypium barbadense L. var. Suvin) x KC 3. Genotypic correlation studies revealed that number of bolls per plant, boll weight, number of sympodia per plant, number of seeds per boll, seed index, lint index, days to first flowering, and plant height have a significant positive association with seed cotton yield per plant. Path coefficient analysis showed that number of bolls per plant contributed maximum direct effect to seed cotton yield per plant followed by boll weight and lint index. The highest positive indirect effect on seed cotton yield per plant was also observed through number of bolls per plant. This indicated that seed cotton yield per plant was highly influenced by number of bolls per plant directly and indirectly. Thus, a greater emphasis should be given to number of bolls per plant, boll weight, and lint index for increasing seed cotton yield per plant.  相似文献   

QTL identification for molecular breeding of fibre yield and fibre quality traits in jute     

Moumita Das  Sumana Banerjee  Niladri Topdar  Avijit Kundu  Reyazul Rouf Mir  Debabrata Sarkar  Mohit K. Sinha  Harindra S. Balyan  Pushpendra K. Gupta 《Euphytica》2012,187(2):175-189

In jute (Corchorus olitorius), quantitative trait loci (QTL) analysis was conducted to study the genetics of eight fibre yield traits and two fibre quality traits. For this purpose, we used a mapping population consisting of 120 recombinant inbred lines (RILs) and also used a linkage map consisting of 36 SSR markers that was developed by us earlier (Das et al. 2011). The RIL population was derived from the cross JRO 524 (coarse fibre) × PPO4 (fine fibre) following single seed descent. Using single-locus analysis involving composite interval mapping, a total of 21 QTLs were identified for eight fibre yield traits whereas for fibre quality (fibre fineness), only one QTL was detected. The QTL for fibre fineness explained 8.31–10.56% of the phenotypic variation and was detected in two out of three environments. Using two-locus analysis involving QTLNetwork, as many as 11 M-QTLs were identified for seven fibre yield traits (excluding top diameter) and one M-QTL was identified for fibre fineness which accounted for 4.57% of the phenotypic variation. For six fibre yield traits, we detected 16 E-QTLs involved in nine QQ epistatic interactions. For fibre fineness, four E-QTLs involved in two QQ epistatic interactions and for fibre strength, six E-QTLs involved in three QQ epistatic interactions were identified. Eight out of the 11 M-QTLs observed for the fibre yield traits were also involved in QE interactions; for fibre fineness and fibre strength, no QE interactions were observed.  相似文献   

Interaction between Notch and Hif-alpha in development and survival of Drosophila blood cells     

Mukherjee T  Kim WS  Mandal L  Banerjee U 《Science (New York, N.Y.)》2011,332(6034):1210-1213

A blood cell type termed crystal cell in Drosophila functions in clotting and wound healing and requires Notch for specification and maintenance. We report that crystal cells express elevated levels of Sima protein orthologous to mammalian hypoxia-inducible factor-α (Hif-α) even under conditions of normal oxygen availability. In these platelet-like crystal cells, Sima activates full-length Notch receptor signaling via a noncanonical, ligand-independent mechanism that promotes hemocyte survival during both normal hematopoietic development and hypoxic stress. This interaction initiates in early endosomes, is independent of Hif-β (Τangο in Drosophila), and does not activate hypoxia response targets. Studies in vertebrate myeloid cells have shown a similar up-regulation of Hif-α protein in well-oxygenated environments. This study provides a mechanistic paradigm for Hif-α/Notch interaction that may be conserved in mammals.  相似文献