It is a general term that includes human anatomy, animal anatomy (zootomy) and plant anatomy (phytotomy). Anatomy is divided into various sub specialties in some of its facets anatomy is closely related to Embryology, Histology, comparative anatomy and comparative embryology, through common roots in evolution.

Anatomy is subdivided into gross anatomy (or macroscopic anatomy) and microscopic anatomy. Gross anatomy (also called topographical anatomy, regional anatomy, or anthropotomy) is the study of anatomical structures that can be seen by unaided vision with the naked eye. Microscopic anatomy is the study of minute anatomical structures assisted with microscopes, which includes histology (the study of the organization of tissues), and cytology (the study of cells).

The history of anatomy has been characterized, over time, by a continually developing understanding of the functions of organs and structures in the body including the clinical understanding of how damage to these structures effects other functions in the body. Methods have also advanced dramatically, advancing from examination of animals through dissection of cadavers (dead human bodies) to technologically complex techniques developed in the 20th century including X-ray technology, Sonogram and MRI technology.

Molecular biophysics typically addresses biological questions that are similar to those in biochemistry and molecular biology, but the questions are approached quantitatively. Scientists in this field conduct research concerned with understanding the interactions between the various systems of a cell, including the interactions between DNA, RNA and protein biosynthesis, as well as how these interactions are regulated. A great variety of techniques are used to answer these questions.

Fluorescent imaging techniques, as well as electron microscopy, x-ray crystallography, NMR spectroscopy and atomic force microscopy (AFM) are often used to visualize structures of biological significance. Conformational changes in structure can be measured using techniques such as dual polarisation interferometry and circular dichroism. Direct manipulation of molecules using optical tweezers or AFM can also be used to monitor biological events where forces and distances are at the nanoscale. Molecular biophysicists often consider complex biological events as systems of interacting units which can be understood through statistical mechanics, thermodynamics and chemical kinetics. By drawing knowledge and experimental techniques from a wide variety of disciplines, biophysicists are often able to directly observe, model or even manipulate the structures and interactions of individual molecules or complexes of molecules.

(formerly cytology, from the Greek kytos, "container") is an academic discipline that studies cells – their physiological properties, their structure, the organelles they contain, interactions with their environment, their life cycle, division and death. This is done both on a microscopic and molecular level. Cell biology research encompasses both the great diversity of single-celled organisms like bacteria and protozoa, as well as the many specialized cells in multicellular organisms like humans.

(from Egyptian kēme (chem), meaning "earth") is the science concerned with the composition, structure, and properties of matter, as well as the changes it undergoes during chemical reactions. It is a physical science for studies of various atoms, molecules, crystals and other aggregates of matter whether in isolation or combination, which incorporates the concepts of energy and entropy in relation to the spontaneity of chemical processes. Modern chemistry evolved out of alchemy following the chemical revolution (1773).

13 digit ISBNs began to appear on January 1 2005, and all ISBN systems are required to support 13 digits by January 1, 2007.

The first number or numbers of a 10 digit ISBN identifies the country that issued the publishers prefix; this number is followed by a dash and the publisher prefix. 13-digit ISBN's start with either 978 or 979, and the 9 digits that follow correspond to the first 9 digits of a 10-digit ISBN.

ISSN numbers are assigned by the ISSN national Centres coordinated in a network. All ISSN are accessible via the ISSN Register. The ISSN is not "just another administrative number". The ISSN should be as basic a part of a serial as the title.

• As a standard numeric identification code, the ISSN is eminently suitable for computer use in fulfilling the need for file update and linkage, retrieval and transmittal of data.
• As a human readable code, the ISSN also results in accurate citing of serials by scholars, researchers, information scientists and librarians.
• In libraries, the ISSN is used for identifying titles, ordering and checking in, claiming serials, interlibrary-loan, union catalog reporting etc.
• ISSN is a fundamental tool for efficient document delivery. ISSN provides a useful and economical method of communication between publishers and suppliers, making trade distribution systems faster and more efficient, in particular through the use of bar-coding and EDI (electronic data interchange).

Writing in Nature, William Astbury described molecular biology as:

Physiology has traditionally been divided between plant physiology and animal and all living things physiology but the principles of physiology are universal, no matter what particular organism is being studied. For example, what is learned about the physiology of yeast cells may also apply to human cells.

The study of the processes through which learners acquire language. By itself, language acquisition refers to first language acquisition, which studies infants' acquisition of their native language, whereas second language acquisition deals with acquisition of additional languages in both children and adults.

One hotly debated issue is whether biology contributes capacities specific to language acquisition, often referred to as universal grammar, or the language acquisition device (LAD). For fifty years, some linguists, notably Noam Chomsky and the late Eric Lenneberg, have argued for the hypothesis that children have innate, language-specific abilities that facilitate and constrain language learning.

Other researchers, including Elizabeth Bates, Catherine Snow, Brian MacWhinney, and Michael Tomasello, have hypothesized that language learning results from general cognitive abilities and the interaction between learners and their surrounding communities. Recent work by William O'Grady proposes that complex syntactic phenomena result from an efficiency-driven, linear computational system. O'Grady describes his work as "nativism without Universal Grammar."

(Greek: Ψυχολογία, lit. "study of the mind", from ψυχή psykhē "breath, spirit, soul"; and -λογία, -logia "study of") is an academic and applied discipline involving the systematic, and often scientific, study of human mental functions and behavior. Occasionally, in addition or opposition to employing the scientific method, it also relies on symbolic interpretation and critical analysis, although it often does so less prominently than other social sciences such as sociology. Psychologists study such phenomena as perception, cognition, emotion, personality, behavior and interpersonal relationships. Some, especially depth psychologists, also study the unconscious mind.

The UTN is a number that should be obtained early in the history of the trial. The UTN should:

• become permanently attached to the trial
• be used whenever information about the trial is communicated
• become part of the trial's identity
• be documented in the trial protocol
• be submitted every time the trial is registered