Hridai R. Yadav – författare

Quantum chemistry is a branch of theoretical chemistry which applies quantum mechanics and quantum field theory to address problems in chemistry. One application of quantum chemistry is the electronic behavior of atoms and molecules relative to their chemical reactivity. Quantum chemistry lies on the border between chemistry and physics. Thus, significant contributions have been made by scientists from both fields. It has a strong and active overlap with the field of atomic physics and molecular physics, as well as physical chemistry. Quantum chemistry is based on the postulates of Quantum Mechanics. The theory of quantum chemistry with an emphasis on their practical implications for the molecular modeller, and we will try to answer the questions of when to use a quantum chemical method instead of molecular mechanics, which quantum chemical method to choose, and what to expect from the quality of the results.

Mammals are animals of the Mammalia, a large class of warm blooded vertebrates having mammary glands in the female, a thoracic diaphragm, and a four chambered heart. The class includes the whales, carnivores, rodents, bats, primates etc. Amidst the plenty of literature on the topic in one shape and other, this work is unique which encompasses complete encyclopaedic information on Mammals. This text is designed to approach the morphology, anatomy, physiology and development of the Mammals in a coherent way. Profusely illustrated, the book features both a text and a laboratory guide. It deals with the structures and physiological phenomena of each system. Origin, adaptative radiation and other general topics are also dealt in details. It is hoped that this work will not only meet the requirement of Indian students but will also be useful as a dependable reference work to the teachers in their teaching

Members of the phylum Mollusca are among the most conspicuous invertebrates and include such familiar forms as clams, oysters, squids, octopods and snails. During the last 18th and 19th centuries, when natural history occupied the time of many well to do gentlemen, shell collections were as popular as today. Such collections, often containing species gathered from various parts of the world, have contributed considerably to our knowledge of the phylum. In abundance of species, mollusca comprise the largest invertebrate phylum aside from the Arthropoda. Over, 1,00,000 living species have been described. In addition, some 35,000 fossile species are known. The Term Mollusca (L. mollis = soft)mean soft bodied and for the first time coined by Aristotle in his famous Historia Animalium to describe various kinds of cephalopods and gastropods. The term Mollusca was used by Jonston (1650) to include cephalopods and barnacles. Phylum Mollusca is divided directly into five classes-Amphineura, Gastropoda, Scaphopoda, Lamellibranchia and Cephalopoda, by Paseneer (1892) has remained standard ever since. This encyclopaedic work in three volumes is designed to present entire vital information on Mollusca. Profusely illustrated in the light of latest researches, this work is a dependable reference work for students and researchers in the discipline.

Members of the phylum Mollusca are among the most conspicuous invertebrates and include such familiar forms as clams, oysters, squids, octopods and snails. During the last 18th and 19th centuries, when natural history occupied the time of many well to do gentlemen, shell collections were as popular as today. Such collections, often containing species gathered from various parts of the world, have contributed considerably to our knowledge of the phylum. In abundance of species, mollusca comprise the largest invertebrate phylum aside from the Arthropoda. Over, 1,00,000 living species have been described. In addition, some 35,000 fossile species are known. The Term Mollusca (L. mollis = soft)mean soft bodied and for the first time coined by Aristotle in his famous Historia Animalium to describe various kinds of cephalopods and gastropods. The term Mollusca was used by Jonston (1650) to include cephalopods and barnacles. Phylum Mollusca is divided directly into five classes-Amphineura, Gastropoda, Scaphopoda, Lamellibranchia and Cephalopoda, by Paseneer (1892) has remained standard ever since. This encyclopaedic work in three volumes is designed to present entire vital information on Mollusca. Profusely illustrated in the light of latest researches, this work is a dependable reference work for students and researchers in the discipline.