id stringlengths 15 156 ⌀ | content stringlengths 1 234k ⌀ |
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fast_asleep/3926054_13_0.txt | The (Markovian) transition probability,
is defined for each pair of stages—including the “transition” from one stage to the same stage—as the conditional probability of an epoch being in one stage
given the stage
of the immediately preceding epoch. Empirically,
can be estimated by the observed proportion of epochs of s... |
fast_asleep/Cellstatetransitions_45_0.txt | Disease Models & Mechanisms |
fast_asleep/rsta20140093_3_0.txt | 1. Introduction
Humans spend a third of their life asleep. Sleep is a time of non-consciousness with its own structure and microstructure consisting of sleep stages, which may be identified by analysing brain waves. For this purpose, brain waves are recorded in a standardized way according to the manual of the American... |
fast_asleep/full_147_0.txt | Google Scholar |
fast_asleep/full_20_1.txt | .96 (range: 0–21, cutoff score: 5.5≥). The average score on the SDS was within the standard range (range: 20–80, cutoff score: 40>, average score in all participants: 39.2 ± 5.49). |
fast_asleep/3926054_36_1.txt | Amsterdam sample. Forward stepwise logistic regression carried out on the Freiburg validation data selected the transition probability from stage W to stage W in the first step ( χ2(1) = 19.01, p = 1 × 10–5), the transition probability from stage R to stage W in the second step ( χ2(1) = 9.17, p =.002), the transition... |
fast_asleep/Cellstatetransitions_19_0.txt | Does the road cells take matter?
By using such bottom-up approaches, we have realised that different cell types occasionally converge towards the same state, despite the fact that they have different origins and might have taken different trajectories. In such cases, distinguishing between cell types and cell states is... |
fast_asleep/full_37_1.txt | low RR intervals and HF amplitude may be associated with hyperarousal and/or autonomic hyperactivation related to alertness, with an increase in phasic cortical events related to autonomic activation (i.e., arousal and EEG desynchronization) in the adaptation night (Trinder et al., 2003; Kato et al., 2004; de Zambotti... |
fast_asleep/3926054_47_1.txt | conflicts of interest. |
fast_asleep/rsta20140093_52_1.txt | k. To determine the order of the Markov chain the authors propose to run the test for ascending k starting with k=0 and choose the first k for which the p-value is larger than a significance threshold pth [21]. |
fast_asleep/3926054_35_1.txt | the Freiburg validation sample. Stage N1 duration and the SSI did not significantly discriminate between cases and controls in the Freiburg validation sample, whereas they did in the Amsterdam sample. |
fast_asleep/full_34_1.txt | and heart rate variability were differentially altered during the progression of sleep cycles between the adaptation and experimental nights in healthy subjects. |
fast_asleep/rsta20140093_43_0.txt | First, we consider changes of transition probabilities due to ageing. Figure 6 shows a comparison of transition patterns of normal old and young subjects. The matrices show the transition probabilities for each group (given as numbers in per mille, compare with figure 2). The graph shows all significant differences of ... |
fast_asleep/full_24_1.txt | experimental night (p < 0.01). |
fast_asleep/Ventrolateral_preoptic_nucleus_2.txt | Function[edit]
Sleep/wakefulness[edit]
Schematic representation of the Flip-Flop Switch Hypothesis
In the early 20th century, Constantin von Economo noted that humans who had encephalitis with lesions in the anterior hypothalamus had insomnia, and proposed a sleep-promoting influence from that area. Animal studies in ... |
fast_asleep/rsta20140093_35_0.txt | Display Formula
3.5
with Inline Formula being a normalized version of Pw
Display Formula
3.6
In [11], these entropies are called 2D-WSE and 2D-HSE depending on the applied transform. In the following, we will refer to these quantities simply as WSE and HSE, as only the two-dimensional versions are employed here. |
fast_asleep/Cellstatetransitions_4_2.txt | complementary approaches: by molecular characterisation, i.e. the description of different molecules (whether transcripts, distribution of chromatin marks or proteins), and by functional characterisation i.e. the description of what a specific cell can do. |
fast_asleep/rsta20140093_32_0.txt | Display Formula
3.2
In the second step, either the Walsh transform or the Haar transform is applied to moving temporal windows Inline Formula, t∈[w,w+l−1] of the binary time series. Both transforms make use of a corresponding matrix Inline Formula: the Hadamard matrix in the case of the Walsh transform or the Haar matr... |
fast_asleep/full_139_0.txt | PubMed Abstract | CrossRef Full Text | Google Scholar |
fast_asleep/full_64_0.txt | de Zambotti, M., Covassin, N., De Min Tona, G., Sarlo, M., and Stegagno, L. (2011). Sleep onset and cardiovascular activity in primary insomnia. J. Sleep Res. 20, 318–325. doi: 10.1111/j.1365-2869.2010.00871.x |
fast_asleep/rsta20140093_53_0.txt | We applied this Markov order test to each dataset individually using the algorithm published in [22]. We chose Inline Formula as the maximum Markov order and used 1000 surrogates for each test. The method was applied to time series containing only the sleep-stage transitions, the durations were taken out. Figure 9 show... |
longest-lasting_protein/Lens_(vertebrate_anatomy)_1_5.txt | oglycan (sulfated glycosaminoglycans (GAGs)), entactin, type IV collagen, laminin. The capsule is very elastic and so allows the lens to assume a more spherical shape when the tension of the suspensory ligaments is reduced. The human capsule varies from 2 to 28 micrometres in thickness, being thickest near the equator ... |
longest-lasting_protein/Protein_0_1.txt | residues is called a polypeptide. A protein contains at least one long polypeptide. Short polypeptides, containing less than 20–30 residues, are rarely considered to be proteins and are commonly called peptides. The individual amino acid residues are bonded together by peptide bonds and adjacent amino acid residues. T... |
longest-lasting_protein/Protein_8_0.txt | Protein evolution
Main article: Molecular evolution
A key question in molecular biology is how proteins evolve, i.e. how can mutations (or rather changes in amino acid sequence) lead to new structures and functions? Most amino acids in a protein can be changed without disrupting activity or function, as can be seen fr... |
longest-lasting_protein/Protein_folding_4_6.txt | used more frequently in the pursuit of the native structure. As the protein begins to fold and assume its various conformations, it always seeks a more thermodynamically favorable structure than before and thus continues through the energy funnel. Formation of secondary structures is a strong indication of increased s... |
longest-lasting_protein/Protein_0_0.txt |
Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues. Proteins perform a vast array of functions within organisms, including catalysing metabolic reactions, DNA replication, responding to stimuli, providing structure to cells and organisms, and transporting mo... |
longest-lasting_protein/Protein_5_1.txt | uracil–guanine) is the code for methionine. Because DNA contains four nucleotides, the total number of possible codons is 64; hence, there is some redundancy in the genetic code, with some amino acids specified by more than one codon. Genes encoded in DNA are first transcribed into pre-messenger RNA (mRNA) by proteins ... |
longest-lasting_protein/Protein_folding_4_3.txt | ima in the energy landscape of proteins.
A consequence of these evolutionarily selected sequences is that proteins are generally thought to have globally "funneled energy landscapes" (a term coined by José Onuchic) that are largely directed toward the native state. This "folding funnel" landscape allows the protein to ... |
longest-lasting_protein/Protein_7_10.txt | close homologs in every biological kingdom. Lectins are sugar-binding proteins which are highly specific for their sugar moieties. Lectins typically play a role in biological recognition phenomena involving cells and proteins. Receptors and hormones are highly specific binding proteins.
Transmembrane proteins can also... |
longest-lasting_protein/Lens_(vertebrate_anatomy)_1_3.txt | front of the lens but not the back. The lens itself lacks nerves, blood vessels, or connective tissue. Anatomists will often refer to positions of structures in the lens by describing it like a globe of the world. The front and back of the lens are referred to as the anterior and posterior "poles", like the North and ... |
longest-lasting_protein/Protein_4_5.txt | coli and Staphylococcus aureus). Smaller bacteria, such as Mycoplasma or spirochetes contain fewer molecules, on the order of 50,000 to 1 million. By contrast, eukaryotic cells are larger and thus contain much more protein. For instance, yeast cells have been estimated to contain about 50 million proteins and human ce... |
longest-lasting_protein/Elastin_2_3.txt | transcutaneous elimination of elastotic fibers. |
longest-lasting_protein/Protein_folding_3_10.txt | of concentrated protein. In NMR, depending on the chemical environment, certain nuclei will absorb specific radio-frequencies. Because protein structural changes operate on a time scale from ns to ms, NMR is especially equipped to study intermediate structures in timescales of ps to s. Some of the main techniques for ... |
longest-lasting_protein/Protein_5_0.txt | Synthesis
Biosynthesis
A ribosome produces a protein using mRNA as template
The DNA sequence of a gene encodes the amino acid sequence of a protein
Main article: Protein biosynthesis
Proteins are assembled from amino acids using information encoded in genes. Each protein has its own unique amino acid sequence that is ... |
longest-lasting_protein/Protein_folding_1_12.txt | sequence.
Chaperones[edit]
Example of a small eukaryotic heat shock protein
Molecular chaperones are a class of proteins that aid in the correct folding of other proteins in vivo. Chaperones exist in all cellular compartments and interact with the polypeptide chain in order to allow the native three-dimensional confor... |
longest-lasting_protein/Lens_(vertebrate_anatomy)_1_9.txt | lies around the equator. These tightly packed layers of lens fibers are referred to as laminae. The lens fiber cytoplasms are linked together via gap junctions, intercellular bridges and interdigitations of the cells that resemble "ball and socket" forms.
The lens is split into regions depending on the age of the lens... |
longest-lasting_protein/Elastin_2_1.txt | and is a form of degenerative disease. There are a multitude of causes, but the most commons cause is actinic elastosis of the skin, also known as solar elastosis, which is caused by prolonged and excessive sun exposure, a process known as photoaging. Uncommon causes of skin elastosis include elastosis perforans serpi... |
longest-lasting_protein/Protein_(nutrient)_0_3.txt | include grains, legumes, nuts, seeds, meats, dairy products, fish, eggs, edible insects, and seaweeds. |
longest-lasting_protein/Protein_9_4.txt | agged components of the lysate pass unimpeded. A number of different tags have been developed to help researchers purify specific proteins from complex mixtures.
Cellular localization
Proteins in different cellular compartments and structures tagged with green fluorescent protein (here, white)
The study of proteins in ... |
longest-lasting_protein/Protein_(nutrient)_8_0.txt | Protein deficiency[edit]
A child in Nigeria during the Biafra War with kwashiorkor – one of the three protein energy malnutrition ailments affecting over 10 million children in developing countries.
Main article: Protein-energy malnutrition
Protein deficiency and malnutrition (PEM) can lead to variety of ailments incl... |
longest-lasting_protein/Protein_folding_3_12.txt | ation dispersion and chemical exchange saturation transfer have become some of the primary techniques for NMR analysis of folding. In addition, both techniques are used to uncover excited intermediate states in the protein folding landscape. To do this, CPMG Relaxation dispersion takes advantage of the spin echo phenom... |
longest-lasting_protein/Protein_(nutrient)_9_0.txt | See also[edit]
Food portal
Azotorrhea
Biological value
Bodybuilding supplement
Leaf protein concentrate
Low-protein diet
Ninja diet
Protein bar
Single-cell protein
List of proteins in the human body |
longest-lasting_protein/Protein_folding_4_0.txt | Computational studies of protein folding[edit]
Computational studies of protein folding includes three main aspects related to the prediction of protein stability, kinetics, and structure. A 2013 review summarizes the available computational methods for protein folding.
Levinthal's paradox[edit]
In 1969, Cyrus Levintha... |
longest-lasting_protein/Protein_folding_2_5.txt | disorders, an emerging approach is to use pharmaceutical chaperones to fold mutated proteins to render them functional. |
longest-lasting_protein/Protein_folding_1_17.txt | that they evolved very early and have an important function. Some proteins never fold in cells at all except with the assistance of chaperones which either isolate individual proteins so that their folding is not interrupted by interactions with other proteins or help to unfold misfolded proteins, allowing them to re... |
longest-lasting_protein/Protein_9_0.txt | Methods of study
Main article: Protein methods
The activities and structures of proteins may be examined in vitro, in vivo, and in silico. In vitro studies of purified proteins in controlled environments are useful for learning how a protein carries out its function: for example, enzyme kinetics studies explore the ch... |
longest-lasting_protein/Protein_folding_1_11.txt | a large hydrophobic region. The strength of hydrogen bonds depends on their environment; thus, H-bonds enveloped in a hydrophobic core contribute more than H-bonds exposed to the aqueous environment to the stability of the native state.
In proteins with globular folds, hydrophobic amino acids tend to be interspersed a... |
longest-lasting_protein/Protein_9_12.txt | changes due to interactions or other stimulus. Circular dichroism is another laboratory technique for determining internal β-sheet / α-helical composition of proteins. Cryoelectron microscopy is used to produce lower-resolution structural information about very large protein complexes, including assembled viruses; a v... |
longest-lasting_protein/Lens_(vertebrate_anatomy)_1_1.txt | bathes the lens with nutrients and other things. Land vertebrate lenses usually have an ellipsoid, biconvex shape. The front surface is less curved than the back. A human adult the lens is typically about 10mm in diameter and 4mm thick though changes shape with accommodation and size due to grow throughout a person's ... |
longest-lasting_protein/Protein_folding_0_2.txt | of transition from a folded to an unfolded state. It happens in cooking, burns, proteinopathies, and other contexts. Residual structure present, if any, in the supposedly unfolded state may form a folding initiation site and guide the subsequent folding reactions.
The duration of the folding process varies dramatical... |
longest-lasting_protein/Protein_folding_1_6.txt | forces, and it is opposed by conformational entropy. The process of folding often begins co-translationally, so that the N-terminus of the protein begins to fold while the C-terminal portion of the protein is still being synthesized by the ribosome; however, a protein molecule may fold spontaneously during or after bi... |
longest-lasting_protein/Lens_(vertebrate_anatomy)_1_2.txt | at edge are remnants of suspensory ligaments
Sheep lens fixed side view. Note the largest lens has damaged capsule and iris attached
Microscope image of lens cell types and capsule
The lens has three main parts: the lens capsule, the lens epithelium, and the lens fibers. The lens capsule is a relatively thick basement... |
longest-lasting_protein/Protein_1_8.txt | 060 atomic-resolution structures of proteins. |
longest-lasting_protein/Protein_6_8.txt | arrangement of contacts within the folded chain. Two theoretical frameworks of knot theory and Circuit topology have been applied to characterise protein topology. Being able to describe protein topology opens up new pathways for protein engineering and pharmaceutical development, and adds to our understanding of prot... |
longest-lasting_protein/Elastin_6_3.txt | elastin molecules are cross-linked via their lysine residues with desmosine and isodesmosine cross-linking molecules. The enzyme that performs the crosslinking is lysyl oxidase, using an in vivo Chichibabin pyridine synthesis reaction. |
longest-lasting_protein/Protein_(nutrient)_6_7.txt | foods are responsible for about 90% of allergic reactions: cow's milk, eggs, wheat, shellfish, fish, peanuts, tree nuts and soy.
Chronic kidney disease[edit]
While there is no conclusive evidence that a high protein diet can cause chronic kidney disease, there is a consensus that people with this disease should decrea... |
longest-lasting_protein/Protein_(nutrient)_1_1.txt | response, cellular repair, and other molecules essential for life. Additionally, protein is needed to form blood cells. |
longest-lasting_protein/Protein_(nutrient)_5_1.txt | injury. Physical activity and exertion as well as enhanced muscular mass increase the need for protein. Requirements are also greater during childhood for growth and development, during pregnancy, or when breastfeeding in order to nourish a baby or when the body needs to recover from malnutrition or trauma or after an... |
longest-lasting_protein/Protein_3_0.txt | Classification
Main articles: Protein family, Gene Ontology, and Enzyme Commission number
Proteins are primarily classified by sequence and structure, although other classifications are commonly used. Especially for enzymes the EC number system provides a functional classification scheme. Similarly, the gene ontology ... |
longest-lasting_protein/Protein_(nutrient)_7_0.txt | Excess consumption[edit]
See also: Protein poisoning
The U.S. and Canadian Dietary Reference Intake review for protein concluded that there was not sufficient evidence to establish a Tolerable upper intake level, i.e., an upper limit for how much protein can be safely consumed.
When amino acids are in excess of needs,... |
longest-lasting_protein/Protein_folding_3_6.txt | One thus obtains a profile relating the global protein signal to the denaturant value. The profile of equilibrium unfolding may enable one to detect and identify intermediates of unfolding. General equations have been developed by Hugues Bedouelle to obtain the thermodynamic parameters that characterize the unfolding ... |
longest-lasting_protein/Protein_9_7.txt | inescent or chromogenic signals that can be compared between samples, allowing for localization information. Another applicable technique is cofractionation in sucrose (or other material) gradients using isopycnic centrifugation. While this technique does not prove colocalization of a compartment of known density and t... |
longest-lasting_protein/Lens_(vertebrate_anatomy)_1_18.txt | of the epithelial cells into crystallin filled fiber cells without organelles occurs within the confines of the lens capsule. Older cells cannot be shed and are instead internalized towards the center of the lens. This process results in a complete temporally layered record of the differentiation process from the star... |
longest-lasting_protein/Protein_(nutrient)_6_2.txt | source. Suggested amounts vary from 1.2 to 1.4 g/kg for those doing endurance exercise to as much as 1.6-1.8 g/kg for strength exercise and up to 2.0 g/kg/day for older people, while a proposed maximum daily protein intake would be approximately 25% of energy requirements i.e. approximately 2 to 2.5 g/kg. However, man... |
longest-lasting_protein/Protein_(nutrient)_4_1.txt | not the end. There, most of the peptides are broken into single amino acids.
Absorption of the amino acids and their derivatives into which dietary protein is degraded is done by the gastrointestinal tract. The absorption rates of individual amino acids are highly dependent on the protein source; for example, the dige... |
longest-lasting_protein/Protein_5_4.txt | synthesized protein can be measured by the number of amino acids it contains and by its total molecular mass, which is normally reported in units of daltons (synonymous with atomic mass units), or the derivative unit kilodalton (kDa). The average size of a protein increases from Archaea to Bacteria to Eukaryote (283, ... |
longest-lasting_protein/Protein_folding_1_8.txt | a cell in order for it to be a spontaneous reaction. Since it is known that protein folding is a spontaneous reaction, then it must assume a negative Gibbs free energy value. Gibbs free energy in protein folding is directly related to enthalpy and entropy. For a negative delta G to arise and for protein folding to bec... |
longest-lasting_protein/Protein_10_3.txt | atole. Dogs and cats digest animal proteins better than those from plants, but products of low-quality animal origin are poorly digested, including skin, feathers, and connective tissue. |
longest-lasting_protein/Protein_6_6.txt | or provide channels for polar or charged molecules to pass through the cell membrane.
A special case of intramolecular hydrogen bonds within proteins, poorly shielded from water attack and hence promoting their own dehydration, are called dehydrons.
Protein domains
Main article: Protein domain
Many proteins are compo... |
longest-lasting_protein/Protein_9_6.txt | uoles, mitochondria, chloroplasts, plasma membrane, etc. With the use of fluorescently tagged versions of these markers or of antibodies to known markers, it becomes much simpler to identify the localization of a protein of interest. For example, indirect immunofluorescence will allow for fluorescence colocalization an... |
longest-lasting_protein/Elastin_7_0.txt | Molecular biology[edit]
Domain structure of human tropoelastin
In mammals, the genome only contains one gene for tropoelastin, called ELN. The human ELN gene is a 45 kb segment on chromosome 7, and has 34 exons interrupted by almost 700 introns, with the first exon being a signal peptide assigning its extracellular loc... |
longest-lasting_protein/Protein_(nutrient)_7_5.txt | a result of consumption of certain meats and proteins. While the 2015 DGA report does advise for a reduced level of consumption of red and processed meats, the 2015-2020 DGA key recommendations recommend that a variety of protein foods be consumed, including both vegetarian and non-vegetarian sources of protein. |
longest-lasting_protein/Protein_6_1.txt |
Further information: Protein structure prediction
Most proteins fold into unique 3D structures. The shape into which a protein naturally folds is known as its native conformation. Although many proteins can fold unassisted, simply through the chemical properties of their amino acids, others require the aid of molecul... |
longest-lasting_protein/Protein_0_5.txt | ation, precipitation, electrophoresis, and chromatography; the advent of genetic engineering has made possible a number of methods to facilitate purification. Methods commonly used to study protein structure and function include immunohistochemistry, site-directed mutagenesis, X-ray crystallography, nuclear magnetic re... |
longest-lasting_protein/Protein_folding_2_2.txt | not be efficient enough to degrade the misfolded proteins prior to aggregation. Misfolded proteins can interact with one another and form structured aggregates and gain toxicity through intermolecular interactions.
Aggregated proteins are associated with prion-related illnesses such as Creutzfeldt–Jakob disease, bovin... |
longest-lasting_protein/Protein_folding_4_8.txt | be rate-determining, and even though it exists in a higher energy state than the native fold, it greatly resembles the native structure. Within the transition state, there exists a nucleus around which the protein is able to fold, formed by a process referred to as "nucleation condensation" where the structure begins ... |
longest-lasting_protein/Protein_(nutrient)_3_1.txt | -derived protein products. However, on food labels the protein is calculated by the nitrogen multiplied by 6.25, because the average nitrogen content of proteins is about 16%. The Kjeldahl test is typically used because it is the method the AOAC International has adopted and is therefore used by many food standards age... |
longest-lasting_protein/Lens_(vertebrate_anatomy)_1_19.txt | considerably thicker, almost spherical resulting in increased light refraction. This difference helps compensate for the smaller angle of refraction between the eye's cornea and the watery environment, as they have more similar refractive indices than cornea and air. The fiber cells of fish are generally considerably ... |
longest-lasting_protein/Lens_(vertebrate_anatomy)_1_15.txt | give rise to the lens epithelium.
Pattern of lens fibers (anterior and lateral aspect)
Additional fibers are derived from lens epithelial cells located at the lens equator. These cells lengthen towards the front and back wrapping around fibers already laid down. The new fibers need to be longer to cover earlier fibers... |
longest-lasting_protein/Protein_1_7.txt | using high intensity X-rays from synchrotrons.
Since then, cryo-electron microscopy (cryo-EM) of large macromolecular assemblies has been developed. Cryo-EM uses protein samples that are frozen rather than crystals, and beams of electrons rather than x-rays. It causes less damage to the sample, allowing scientists to ... |
longest-lasting_protein/Protein_1_6.txt | linear polymers of amino acids rather than branched chains, colloids, or cyclols. He won the Nobel Prize for this achievement in 1958.
John Kendrew with model of myoglobin in progress
With the development of X-ray crystallography, it became possible to sequence protein structures. The first protein structures to be so... |
longest-lasting_protein/Protein_2_0.txt | Number of proteins encoded in genomes
The number of proteins encoded in a genome roughly corresponds to the number of genes (although there may be a significant number of genes that encode RNA of protein, e.g. ribosomal RNAs). Viruses typically encode a few to a few hundred proteins, archaea and bacteria a few hundred ... |
longest-lasting_protein/Protein_(nutrient)_3_4.txt | such as infant formula, but also provides: "When data on amino acids analyses are not available, determination of protein based on total N content by Kjeldahl (AOAC, 2000) or similar method... is considered acceptable."
The testing method for protein in beef cattle feed has grown into a science over the post-war years... |
longest-lasting_protein/Protein_folding_1_14.txt | a more efficient pathway for the polypeptide chain to assume the correct conformations. Chaperones are not to be confused with folding catalyst proteins, which catalyze chemical reactions responsible for slow steps in folding pathways. Examples of folding catalysts are protein disulfide isomerases and peptidyl-prolyl ... |
longest-lasting_protein/Protein_5_5.txt | mass. The largest known proteins are the titins, a component of the muscle sarcomere, with a molecular mass of almost 3,000 kDa and a total length of almost 27,000 amino acids.
Chemical synthesis
Main article: Peptide synthesis
Short proteins can also be synthesized chemically by a family of methods known as peptide ... |
longest-lasting_protein/Lens_(vertebrate_anatomy)_1_13.txt | is the first stage of transformation of a patch of skin into the lens. At this early stage, the lens placode is a single layer of cells.
As development progresses, the lens placode begins to deepen and bow inwards. As the placode continues to deepen, the opening to the surface ectoderm constricts and the lens cells bu... |
longest-lasting_protein/Elastin_4.txt | Characteristics[edit]
Elastin is a very long-lived protein, with a half-life of over 78 years in humans. |
longest-lasting_protein/Lens_(vertebrate_anatomy)_1_16.txt | of the lens are more visible and are termed "sutures". The suture patterns become more complex as more layers of lens fibers are added to the outer portion of the lens.
The lens continues to grow after birth, with the new secondary fibers being added as outer layers. New lens fibers are generated from the equatorial c... |
longest-lasting_protein/Elastin_7_1.txt | regulated under at least eight different transcription start sites.
Tissue specific variants of elastin are produced by alternative splicing of the tropoelastin gene. There are at least 11 known human tropoelastin isoforms. these isoforms are under developmental regulation, however there are minimal differences among ... |
longest-lasting_protein/Lens_(vertebrate_anatomy)_3_1.txt | the age-related loss of accommodation, which is marked by the inability of the eye to focus on nearby objects. The exact mechanism is still unknown, but age-related changes in the hardness, shape, and size of the lens have all been linked to the condition.
Ectopia lentis is the displacement of the lens from its normal... |
longest-lasting_protein/Protein_9_1.txt | Protein purification
Main article: Protein purification
To perform in vitro analysis, a protein must be purified away from other cellular components. This process usually begins with cell lysis, in which a cell's membrane is disrupted and its internal contents released into a solution known as a crude lysate. The resu... |
longest-lasting_protein/Protein_4_2.txt | chemical reactivity.
The amino acids in a polypeptide chain are linked by peptide bonds. Once linked in the protein chain, an individual amino acid is called a residue, and the linked series of carbon, nitrogen, and oxygen atoms are known as the main chain or protein backbone.
The peptide bond has two resonance forms ... |
longest-lasting_protein/Protein_7_8.txt | . Many receptors have a binding site exposed on the cell surface and an effector domain within the cell, which may have enzymatic activity or may undergo a conformational change detected by other proteins within the cell.
Antibodies are protein components of an adaptive immune system whose main function is to bind anti... |
longest-lasting_protein/Lens_(vertebrate_anatomy)_1_14.txt | then sends signals from the developing retina, inducing the cells closest to the posterior end of the lens vesicle to elongate toward the anterior end of the vesicle. These signals also induce the synthesis of proteins called crystallins. As the name suggests the crystallins can form a clear highly refractive jelly. ... |
longest-lasting_protein/Protein_folding_4_9.txt | state (left) into its native 3D structure (right).
De novo or ab initio techniques for computational protein structure prediction can be used for simulating various aspects of protein folding. Molecular dynamics (MD) was used in simulations of protein folding and dynamics in silico. First equilibrium folding simulatio... |
longest-lasting_protein/Lens_(vertebrate_anatomy)_3_0.txt | Clinical significance[edit]
Cataracts are opacities of the lens. While some are small and do not require any treatment, others may be large enough to block light and obstruct vision. Cataracts usually develop as the aging lens becomes more and more opaque, but cataracts can also form congenitally or after injury to the... |
longest-lasting_protein/Protein_folding_3_16.txt | protein folding has been greatly advanced in recent years by the development of fast, time-resolved techniques. Experimenters rapidly trigger the folding of a sample of unfolded protein and observe the resulting dynamics. Fast techniques in use include neutron scattering, ultrafast mixing of solutions, photochemical m... |
longest-lasting_protein/Lens_(vertebrate_anatomy)_1_4.txt | scattering light that would otherwise affect vision.
Lens capsule[edit]
Main article: Capsule of lens
Sheep lens capsule removed. Decapsulation leads to a nearly formless blob.
A foot on a mouse lens capsule suspensory ligament forming part of the Zonule of Zinn
The lens capsule is a smooth, transparent basement membr... |
longest-lasting_protein/Protein_7_5.txt | . Enzymes are usually highly specific and accelerate only one or a few chemical reactions. Enzymes carry out most of the reactions involved in metabolism, as well as manipulating DNA in processes such as DNA replication, DNA repair, and transcription. Some enzymes act on other proteins to add or remove chemical groups ... |
longest-lasting_protein/Protein_folding_3_14.txt | NMR spectrum.
In a study focused on the folding of an amyotrophic lateral sclerosis involved protein SOD1, excited intermediates were studied with relaxation dispersion and Saturation transfer. SOD1 had been previously tied to many disease causing mutants which were assumed to be involved in protein aggregation, howev... |
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