A wide Array of people is attracted to the fascinating world of insects, especially because of their morphology and interesting ways of life.In entomology, insect has received considerable attraction from persons concerned with the environment.Estimates of the total number of insect species in the world range from one million to thirty million species but widely acceptable figure would probably be around five million.Anyhow about 9,00,000 insect species have been named and described and many more are being identified each year.since many years, there has been a pressing demand, from the students of Entomology for a handy book of insect and their orders. An effort has been made to provide the characters and information, which is classify the insects into related orders and their habit

A simple spectrophotometric method for determination of cefaclor in raw and dosage forms based on reaction with ninhydrin is developed, optimized and validated. The purple color (Ruhemenn's purple) resulted from the reaction was stabilized and measured at 560 nm.The method optimization was essential as many procedural parameters influenced the accuracy of determination all variables including the reagent concentration, heating time, reaction temperature, color stability period, and cefaclor/ninhydrin ratio were studied in order to optimize the reaction conditions. No interference was observed from common pharmaceutical adjuvant. The developed method is easy to use, accurate and highly cost-effective for routine studies relative to HPLC and other techniques.

An extensive literature assessment is done and it is obvious that the methods are accessible for Ranitidine. HPLC is very expensive instrument and are not available in every laboratory. While UV/Visible spectrophotometer is a common instrument of all pharmaceutical analytical laboratory. Spectrophotometric analysis methods available for Ranitidine are tedious, time consuming and not much sensitive in term of precision and accuracy. It becomes essential to develop new rapid and cost effective methods that spectrophotometric determination would be simple, accurate, precise and sensitive. The newly developed analytical methods can be used in research institutions, Quality control in pharmaceutical industries, Approved testing laboratories and Bioequivalence studies.