|Process of filtration in which a medium (semipermeable) which allows small molecules to pass through is called ultrafiltration. Some times this can be conducted under pressure. This process naturally occurs in kidneys. Usually membrane having a pore size of 0.001 - 0.1µm size are used.
A journal is a periodical publication intended to further progress of science, usually by reporting new research. Most journals are highly specialized, although some of the oldest journals publish articles, reviews, editorials, short communications, letters, and scientific papers across a wide range of scientific fields. Journals contain articles that peer reviewed, in an attempt to ensure that articles meet the journal's standards of quality, and scientific validity. Each such journal article becomes part of the permanent scientific record.