Wyniki wyszukiwania - Biblioteka Nauki

1

Porosity of certain classes of operators in generalized metric spaces

100%

Das P. , Dey L.

Demonstratio Mathematica

|

2009

|

tom Vol. 42, nr 1

163-174

EN

We study the porosity behavior of non-contractive mappings in a generalized metric space, a concept recently introduced in [1]. We also investigate partially the porosity position of a certain class of operators whose condition arises from [8].

2

Well-posedness and porosity of a certain class of operators

100%

Lahiri B. , Das P.

Demonstratio Mathematica

|

2005

|

tom Vol. 38, nr 1

169--176

EN

We prove that several fixed point problems are well-posed and study the porosity behaviour of a certain class of operators.

3

Genetic markers for the detection of quantitative trait loci with special consideration of body weight and fat

80%

Brockmann G. A. , Renne U. , Kopplow K. , Das P.

Acta Theriologica. Supplement

|

1998

|

tom 43

|

nr 5

4

Self-similarity in the decay of homogeneous and isotropic turbulence

80%

Chanda A. , Das P. , De A. , Das J.

Journal of Technical Physics

|

2000

|

tom Vol. 41, no 1

43-47

EN

Decay of turbulent energy in isotropic and homogeneous conditions has been discussed from the point of view of geometrical and statistical self similarity. Assuming the presence of self-similar eddies in the inertial subrange, a model of the inertial transfer of turbulent energy in the sense of fractal has been built. A method to extend the model to multifractal formalism has been also suggested.

5

In vitro hormone-regulated growth and floral induction of Cuscuta reflexa: a parasitic angiosperm

80%

Das P. , Kar M. , Sahoo S.

Acta Physiologiae Plantarum

|

2011

|

tom 33

|

nr 3

EN

The role of different growth regulators in callus induction, shoot regeneration, floral induction and chlorophyll content of the obligatory parasitic plant Cuscuta reflexa has been studied. Callus development was excellent from the nodal part of the shoot explants in modified Murashige and Skoog (MMS) media supplemented with 2 mg L⁻¹ benzyl adenine (MMS1c). Supplementation of 2 mg L⁻¹ naphthalene acetic acid (NAA) along with MMS1c (MMS2c) was responsible for estimable shoot induction and development in callus. 2,4-Dichloro acetic acid (2,4-D) played a crucial role in the floral induction of C. reflexa in vitro. MMS supplemented with 2 mg L⁻¹ NAA and 2 mg L⁻¹ 2,4-D (MMS3b) supported floral induction after shooting in vitro. MMS supplemented with 3 mg L⁻¹ 2,4-D (MMS4a) rapidly induced flower directly from the stem explants without showing any elongation of shoot. MMS1c along with MMS3b (MMS5a) showed callus proliferation followed by shoot elongation and floral induction. In vitro MMS5a grown plants show a sharp increase in the chlorophyll contents. Cytokinin treatment further increases the chlorophyll level of the plant.

6

Role of chromium on plant growth and metabolism

80%

Samantaray S. , Rout G. R. , Das P.

Acta Physiologiae Plantarum

|

1998

|

tom 20

|

nr 2

EN

The beneficial as well as toxic effects of chromium with regard to its absorption, translocation and accumulation in different parts of plants were reviewed. High concentrations of chromium exhibited severe chlorosis, necrosis and a host of other growth abnormalities and anatomical disorders. The regulation of the mineral metabolism, enzyme activity and other metabolic processes by chromium in plants was discussed.

7

Chromium and nickel tolerance of Trema orientalis [Blume] L. in tissue culture

80%

Samantaray S. , Rout G. R. , Das P.

Acta Physiologiae Plantarum

|

1999

|

tom 21

|

nr 1

EN

Callus of Trema orientalis derived from both contaminated and uncontaminated sources were tested in vitro for their relative tolerance to chromium and nickel. The calluses derived from contaminated source were metal-tolerant and showed better growth than those obtained from uncontaminated plants. The specificity of metal tolerance shown by the parent material was maintained in the calluses. Compared to the uncontaminated explants, the calli derived from contaminated sources exhibited higher catalase and peroxidase activities but a reduced acid phosphatase activity. Biochemical studies, provided evidence that the contaminated sources were physiologically distinct from the uncontaminated ones. Thus, this study indicated that seeds of Trema orientalis collected from contaminated sites were tolerant to chromium and nickel, and may have the advantage of being used in sustainable revegetation programmes on chromiferous minewastes.

8

Melatonin action on thyroid activity in the soft-shelled turtle, Lissemys punctata punctata

80%

Sarkar S. , Sarkar N. K. , Bhattacharyya S. , Das P.

Folia Biologica

|

1997

|

tom 45

|

nr 3-4

9

Microbes as components in sustainable development of wastelands

80%

Rout G. R. , Samantaray S. , Meshram A. , Das P.

Acta Microbiologica Polonica

|

1999

|

tom 48

|

nr 1

10

Augmenting in vitro shoot multiplication with growth regulators and light conditions in Musa acuminata cv. Dwarf Cavendish

80%

Rout G. R. , Samantaray S. , Das P.

Acta Biologica Cracoviensia. Series Botanica

|

2001

|

tom 43

EN

An efficient protocol was developed for in vitro mass propagation of the commercial cultivar Musa acuminata cv. Dwarf Cavendish through shoot apices culture. Shoot apices with 2-3 pairs of leaf primordia were induced from sliced rhizome explants on Murashige and Skoog (1962) medium supplemented with 6.0 mg/l BA, 150 mg/l Ads and 3% (w/v) sucrose. Multiple shoots were induced from meristematic domes on the same medium. Addition of 1.0-1.5 mg/l IAA to the culture medium and incubation in continuous light (24 h) increased the yield of multiple shoots. The high multiplication coefficient was maintained stable up to the 5th subculture; thereafter it declined. Rooting was readily achieved upon transferring the shoots onto half-strength MS medium supplemented with 500 mg/l activated charcoal and 2% (w/v) sucrose. Micropropagated plantlets were hardened in a polyethylene house and successfully established in soil. There was no morphological variation among the micropropagated plants.

11

In vitro selection and characterization of Ni-tolerant callus lines of Setaria italica L.

80%

Rout G. R. , Samantaray S. , Das P.

Acta Physiologiae Plantarum

|

1998

|

tom 20

|

nr 3

EN

Nickel tolerant callus lines of Setaria italica L. were developed from callus cultures grown on MS medium supplemented with 0.5 mg·dm⁻³ kinetin+2.0 mg·dm⁻³ 2,4-D+2.0 mg·dm⁻³ Ni⁺². Standard growth parameters such as callus fresh and dry weight, growth tolerance index were used as indicators of nickel toxicity. Measurements as early as 2 weeks after the beginning of the treatments did not yield consistent results. However, growth tolerance index at 4, and 8 weeks after the beginning of treatments yielded significant differences among the non-tolerant and tolerant calli. The tolerant calli has enhanced growth at 2.0 mg·dm⁻³ Ni⁺² while non-tolerant calli showed a reverse trend in growth in the presence of 2.0–2.5 mg·dm⁻³ of nickel. The tolerant calli differentiated into mass of embryogenic calli within 4 weeks of culture which could be maintained for prolonged period without loss of regenerative capacity.

12

Socio-environmental survey of an ecologically important hamlet of Darjeeling district, West Bengal, India

70%

Bhattacharya S. , Ghosh G. , Banerjee T. , Goswami S. , Das P.

International Letters of Natural Sciences

|

2015

|

tom 06

EN

Forest cover in hills is essential to maintain environmental, economic and ecological balances. North Bengal accounts for 3,086 sq km (26 %) of the 11,876 sq km area of classified forests in the state, and for nearly 5,000 sq km (40 %) of all land under tree cover. Upper Chatakpur is one of the emerging ecotourism spots of north Bengal, located at an altitude of 7887 feet in Darjeeling district. It is a 180 years old ethnic village with 19 houses and a population of about 89, and at an altitude of 7887 ft. It is about 8 km. from Sonada (26° 57' N, 88° 16' E), 22 km. from Darjeeling (26° 2' N, 88° 15' E) and 72 km. from Siliguri (26° 42' N, 88° 25' E). Upper Chatakpur Village situated within Senchal Wildlife Sanctuary, Darjeeling. The sanctuary with an area of 38.88 sq. km has an elevation of 1500-2600 m. The survey work was done in December, 2014 by visiting upper Chatakpur village and the primary data were gathered through field survey and direct contact with common people and authorized centers of the region. Surveys on the topography, demography, agriculture, livestock, water management, education, culture, health, waste management, transport, biodiversity, human animal conflict were done in this area. Medicinal plant diversity was studied in the village area and information was gathered from the local forest department centre. Information regarding the transport system was collected from the local transport office and syndicate. Census report was collected from the Sonada Panchayat Office. Health and education information was collected from the local primary school and the local sub health centre. Information on sustainable agricultural practices and waste management policies is collected through surveys in the village houses and agricultural fields. Biodiversity of Senchal Wildlife Sanctuary was documented by visiting the forest areas. Pictorial documentation was done in every phase of study. In spite of getting so much attention in the recent time, the village is not adequately developed. There is an urgent need for implementing sustainable management systems in the areas for the betterment of the socio-environmental structures. Some of the possible management strategies have been suggested for maintaining the social, environmental, economic and ecological balance of the region.