Loading....
SIGN UP!
Before you proceed to sign up,
Please select one of the following!
I want to Hire
--OR--
I want to Work as an
Koushik Das Portfolio (showing 1 - 5 of 5 results)
  1. »
  2. »
  3. »
  4. Portfolio
PAGE 1 OF 1
SHOW BY
Effects of Pollution on Fish Reproduction.
Website:
Website Description:
Aquatic ecosystems are the major recipient of pollutants & Fishes act as their potential targets. These pollutants affect their reproductive processes through cellular &/or whole animal energetic. Aquatic pollution retards the reproductive processes in both sexes by impairing the gonadal development, inhibiting the maturation of spermatocytes and oocytes, delaying ovulation, breaking and clumping of yolk material in oocytes and suppressing the synthesis of gonadal steroids via Hypothalamo-hypophysial-gonadal axis.
Skill:
Conservation of wetlands.
Website:
Website Description:
Wetlands are defined as ‘lands transitional between terrestrial and aquatic eco-systems where the water table is usually at or near the surface or the land is covered by shallow water (Mitsch & Gosselink 1986). Wetlands are often biodiversity ‘hotspots’ (Reid et al., 2005), as well as filters for pollutants from both point and non-point sources, and being important for carbon sequestration and emissions (Finlayson et al., 2005). The value of the world’s wetlands are increasingly receiving due attention as they contribute to a healthy environment in many ways. Wetlands are also important storehouses of plant genetic material. Rice, for example, which is a common wetland plant, is the staple diet of more than half of humanity. The Government identifies 6, 48, 507 hectares as wetland in India. It is estimated that freshwater wetlands alone support 20 percent of the known range of biodiversity in India. Wetlands in India occupy 58.2 million hectares, including areas under wet paddy cultivation (Directory of Indian Wetlands). Majority of the inland wetlands are directly or indirectly dependent on the major rivers like, Ganga, Bhramaputra, Narmada, Godavari, Krishna, Kaveri, and Tapti. They occur in the hot arid regions of Gujarat and Rajasthan, the deltaic regions of the east and west coasts, highlands of central India, wet humid zones of south peninsular India and the Andaman and Nicobar & Lakshwadeep islands. (Deepa & Ramachandra, 1999).
Skill:
Writing Solutions.
Website:
Website Description:
Timely delivery of quality work.
Skill:
"The role of the histone code in ES cell differentiation - the current state of knowledge"
Website:
Website Description:
According to the nucleosome concept, the chromatin fibre has ‘beads on astring’ appearance & each bead is called nucleosome , formed of basic protein or histones & DNA. They are loosely bound together in 1:1 ratio to form deoxyribonucleoprotein (DNP). About Histones :  Histones are basic proteins due to the high % of basic amino acids [ Arginine & Lysine ].  There are 5 types of histones. H2A, H2B,H3, & H4 are very similar in different sp. & are present in equimolar amounts, two of eachbeing present every 200 bp as Octamers.  The histone octamers forms a core particle. A DNA segment with 146 nucleotides forms two circles around the core particles, to form a Nucleosome.  Histone H1 is tissue-specific & is present only once / 200 bp, loosely associated with DNA.  The DNA double helix & the histones form the Nucleoprotein / Chromatin fibre.  Histones with DNA in eukaryotic Chromosomes, either act as structural elements / cover / repress specific DNA segments, so that they can’t be transcribed. Such segments can be unwound & exposed for transcription by the dissolution of histonesin response to certain molecular signals.
Skill:
There - is - no - hope - of - doing - perfect - research - griffiths - 1998.
Website:
Website Description:
The word research means to search again & again till perfection is reached. If any research was perfect ,then the word research would have been extinct by now. For example, if any research was perfect computer would’nt have replaced abacus, electricity would’nt have replaced candle, & the list goes on. It also means that we are searching, for something that was lost or to discover a higher/better form of an existing object. If we come to the first definition , that we are searching for something that was lost – for example, our ancestors might have discovered the side effects of a medicinal plant in the long run & therefore discarded it. We may start using it now ; but our future generations may notice those side effects & therefore discard it’s use. Therefore research is a continuous process whose outcomes are not predictable many a time. There is no hope of doing a perfect research because the statistics may vary depending upon the data one has at the time of his research. As because no two people can claim the same result of a topic due to the varying data . I have studied two researches & seen two sides for each of these. If any research was perfect then we would’nt have two opposing views on the same topic, which has lead me to believe that There is no hope of doing perfect research (Griffith’s, 1998, p97).
Skill:
Next