tube in Biological Definition

Aseptic technique in microbiology

... when transferring bacteria from one test tube or flask to another. Such a procedure, using a ... A person would assemble the closed tube or flask from which, and the closed tube or flask to which the specimen is to be ...

Computed axial tomography

... In conventional CT machines, an X-Ray tube is physically rotated behind a circular shroud ... less used electron beam tomography (EBT) the tube is far larger, note the internal funnel shape in ... emission tomography (PET) X-ray X-Ray tube Tomographic reconstruction ...

Neural tube

... The neural tube is the embryonal structure that gives rise to ... spinal cord . In gestation , the human neural tube gives rise to three vesicles: the ... the prosencephalon . Formation of the neural tube is the result of an invagination of the ectoderm ...

Blood plasma

... is already in the evacuated blood collection tube (e.g. Vacutainer or Vacuette) when the patient ... For this purpose, a serum-separating tube (SST) can be used which contains an inert ... sit between the liquid and cellular layers in the tube after centrifugation, making separation more ...

Dialysis

... dialysis . In hemodialysis , the patient's blood is passed through a tube into a machine that filters out waste products. The cleansed blood is then ... body. In peritoneal dialysis , a special solution is run through a tube into the peritoneal cavity , the abdominal body cavity around the ...

Neural plate

... system . In the development sequence, the neural plate forms the neural tube which then forms the CNS ( central nervous system ), comprised by the ... brain . Masses of tissue called the neural crest separate from the neural tube and form the cord's sensory neurons . ...

Apoptosis

... a consequence of this, their components reused) by macrophages or by neighboring cells. Research on chick embryos - specifically on chick neural tube development - has suggested how selective cell proliferation, combined with selective apoptosis, sculpts developing tissues in vertebrates. During ...

Full blood count

... count 3.1 Red cells 3.2 White cells 3.3 Platelets Automated blood count Blood for a FBC is usually taken into an EDTA tube to stop it from clotting . The blood is well mixed (though not shaken) and put through a machine. The machine, called an automated analyser , ...

Cilium

... human disease. The best known cilia-related disorder is Primary Ciliary Dyskinesia (PCD). In addition, a defect of the primary cilium in the renal tube cells can lead to polycystic kidney disease (PKD). In another genetic disorder called Bardet-Biedl syndrome (BBS), the mutant gene products are ...

Flagellum

... flagellum 4 See also 5 External links Bacterial flagellum The filament is composed of the protein flagellin and is a hollow tube 20 nanometers thick. It is helical, and has a sharp bend just outside the outer membrane called the "hook" which allows the helix to point ...

Kidney

... pelvis : Basically just a funnel , the renal pelvis accepts the urine and channels it out of the hilus into the ureter . ureter : A narrow tube 40 cm long and 4 mm in diameter. Passing from the renal pelvis out of the hilus and down to the bladder . The ureter carries urine from the kidneys ...

Louis Pasteur

... all particles from passing through to the growth medium and even in vessels with no filter at all, with air being admitted via a long tortuous tube that would not allow dust particles to pass. Nothing grew in the broths; therefore, the living organisms that grew in such broths came from outside, ...

Molecular biology

... varying the pH of the solution in which the matrix is contained. The beads can either be suspended in solution (batch processing) or packed into a tube (column processing). History Molecular biology was established in the 1930s , the term was first coined by Warren Weaver in 1938 however. ...

Polymerase chain reaction

... 2.5 l of primer, 1.25 l per primer (100 ng/l) 1.0 l Pfu-Polymerase 1.0 l nucleotides 5.0 l buffer 89.5 l H 2 O A 200 l reaction tube containing the 100 l mixture is inserted into the thermocycler. The PCR process consists of the following steps: Step 1 Initialization. Heat ...

Phloem

... Organic molecules such as sugars, amino acids , certain hormones , and even messenger RNAs are transported in the phloem through sieve tube elements . Phloem is produced in phases. Primary phloem is laid down by the apical meristem . Secondary phloem is laid down by the vascular ...

Lipid bilayer

... membranes , and is a prerequisite of cell-based life . Within a critical range of concentrations, certain kinds of lipids alone in a test tube of water will self-organize to form a "bilayer". The bilayer is composed of two opposing layers of lipid molecules arranged so that their ...

Plant

... during the Jurassic and diversifying rapidly during the Cretaceous . These differ in that the seed embryo is enclosed, so the pollen has to grow a tube to penetrate the protective seed coat; they are the predominant group of flora in most biomes today. Algae and Fungi The algae comprise ...

Plant

... during the Jurassic and diversifying rapidly during the Cretaceous . These differ in that the seed embryo is enclosed, so the pollen has to grow a tube to penetrate the protective seed coat; they are the predominant group of flora in most biomes today. Algae and Fungi The algae comprise ...

Reverse genetics

... without necessarily accelerating mRNA degradation. Morpholinos are effective is systems ranging in complexity from cell-free translation in a test tube to humans. Finally, a more difficult genetics technique is the creation of transgenic organisms that overexpress a gene of interest. The ...