MeSH

A series of steps taken in order to conduct research.

Year introduced: 1991(1967)

Used with techniques, procedures, and programs for methods.

Year introduced: 1975

Use of various chemical separation and extraction methods, such as SOLID PHASE EXTRACTION; CHROMATOGRAPHY; and SUPERCRITICAL FLUID EXTRACTION; to prepare samples for analytical measurement of components.

Year introduced: 2007

A class of natural contraceptive methods in which SEXUAL ABSTINENCE is practiced a few days before and after the estimated day of ovulation, during the fertile phase. Methods for determining the fertile period or OVULATION DETECTION are based on various physiological indicators, such as circulating hormones, changes in cervical mucus (CERVIX MUCUS), and the basal body temperature.

Year introduced: 2004 (1975)

Methods of giving food to humans or animals.

Year introduced: 1998

Research techniques that focus on study designs and data gathering methods in human and animal populations.

Year introduced: 1967(1965)

Utilization of all available receptive and expressive modes for the purpose of achieving communication with the hearing impaired, such as gestures, postures, facial expression, types of voice, formal speech and non-speech systems, and simultaneous communication.

Year introduced: 1991(1980)

Methods of making prediction about a new measurement based on calculations of previous data.

Year introduced: 2025

Methods used for the chemical synthesis of compounds. Included under this heading are laboratory methods used to synthesize a variety of chemicals and drugs.

Year introduced: 2012

Methods used to determine individuals' specific ALLELES or SNPS (single nucleotide polymorphisms).

Year introduced: 2012

Statistical interpretation and description of a population with reference to distribution, composition, or structure.

Techniques used to synthesize chemicals using molecular substrates that are bound to a solid surface. Typically a series of reactions are conducted on the bound substrate that results in either the covalent attachment of specific moieties or the modification of existing function groups. These techniques offer an advantage to those involving solution reactions in that the substrate compound does not have to be isolated and purified between the reaction steps.

Year introduced: 2012

A method in which either the observer(s) or the subject(s) is kept ignorant of the group to which the subjects are assigned.

Year introduced: 1990

A method of studying a drug or procedure in which both the subjects and investigators are kept unaware of who is actually getting which specific treatment.

Year introduced: 1990(Aug 1977)

A method of continuously holding a partially wrapped baby to the chest, involving skin-to-skin contact. Originally it was a method of caring for LOW-BIRTH-WEIGHT INFANT in developing countries and is now more widespread in developed nations. Aside from encouraging breast feeding, the extra sleep that the infant gets assists in regulating body temperature, helps the baby conserve energy, and redirects calorie expenditures toward growth and weight gain.

Year introduced: 2012

Mapping of the KARYOTYPE of a cell.

Year introduced: 1967(1965)

Systematic gathering of data for a particular purpose from various sources, including questionnaires, interviews, observation, existing records, and electronic devices. The process is usually preliminary to statistical analysis of the data.

Year introduced: 1980

Methodologies used for the isolation, identification, detection, and quantitation of chemical substances.

Year introduced: 2010 (1963)

Rapid methods of measuring the effects of an agent in a biological or chemical assay. The assay usually involves some form of automation or a way to conduct multiple assays at the same time using sample arrays.

Year introduced: 2010

A nonparametric method of compiling LIFE TABLES or survival tables. It combines calculated probabilities of survival and estimates to allow for observations occurring beyond a measurement threshold, which are assumed to occur randomly. Time intervals are defined as ending each time an event occurs and are therefore unequal. (From Last, A Dictionary of Epidemiology, 1995)

Year introduced: 2011(2007)