Limitations of human myotubes
Cell culture techniques are dependent on aseptic conditions. The laboratory has to be equipped with the necessary cell culturing facilities and has to have good laboratory practice GLP . Although the technique seems simple, success with cultures of human myotubes depends on technicians with appropriate aseptic skills and the ability to diagnose problems as they arise. It is important to realise that we are dealing with a primary culture system, with restrictions such as limited lifespan of...
Tissue Hypoxia
The observation of constant 'air hunger' brought attention to the role of reduced oxygen supply to the tissues. Cellular hypoxia became the focus of metabolic research at the beginning of the twentieth century. First blood gas analyses were reported as early as 1919 13 and in 1923 it was observed that at high altitudes the study subjects involuntarily lost weight 41 . Evidence for reduced tissue oxygen supply came mostly from indirect observa tions such as increased erythropoietic activity and...
Hypertrophic Cardiomyopathy
Hypertrophic cardiomyopathy is a disorder of the myocardium characterized by excessive myocardial hypertrophy, with a predilection for the interventricular septum. Although there may be obstructive i.e., a demonstrable gradient across the left ventricular outflow tract and nonobstructive forms, there might be little difference between them because the gradient is dynamic and affected by preload, afterload, and other factors. Difficulty with diastolic relaxation and ventricular filling of the...
Duplication of Basal Bodies in Chlamydomonas
In mammalian cells, centriole duplication begins at the G1 to S transition 26 . In contrast, Chlamydomonas cells exiting mitosis have already assembled probasal bodies 27 . Electron microscopy of Chlamydomonas cells in G1, as judged by FACS analysis, shows that they have two probasal bodies adjacent to the two mature basal bodies. These probasal bodies are 40-90 nm in length 5 and are often missed by conventional electron microscopy 3, 4 . This is likely to be due to their short length relative...
Fractal Dimension
Let us call the Euclidean space that just contains a fractal its embedding space. This space has an integral whole number of dimensions. For instance, the Koch curve can be wholly contained in two-dimensional space, and the Menger sponge in three-dimensional space. The definition that has been arrived at for fractals is that they have a dimensionality that describes how much of the embedding space they fill this is known as the fractal dimension . This accords with the use of the term dimension...
The internal jugular vein
The internal jugular vein runs from its origin at the jugular foramen where it continues the sigmoid sinus to its termination behind the sternal extremity of the clavicle, where it joins the subclavian vein to form the brachiocephalic vein. It lies lateral first to the internal and then to the common carotid artery within the carotid sheath and its relations are therefore identical with these vessels Fig. 210 . The deep cervical chain of lymph nodes lies close against the vein and, if involved...
Immobilization Methods
Enzyme immobilization methods are classified as chemical or physical. Chemical methods involve the formation of covalent bonds between functional groups on the Bianalytical Chemistry, by Susan R. Mikkelsen and Eduardo Corton ISBN 0-471-54447-7 Copyright 2004 John Wiley amp Sons, Inc. support material also called the matrix or the carrier and functional groups on the enzyme. Chemical methods are subclassified as either nonpolymerizing or cross-linking methods. Nonpolymerizing methods involve the...
Examples of Global and Local Alignments
An example of global and local alignments between two phage repressor proteins using the Genetics Computer Group GCG programs GAP Needleman-Wunsch algorithm and BESTFIT Smith-Waterman algorithm is shown in Figure 3.11. Note that the proteins are 58 similar in the carboxy-terminal domain, which is the region required for protein-protein interactions and a self-cleavage function that leads to phage induction. In these GCG implementations of the Needleman-Wunsch and Smith-Waterman algorithms, the...
The cervical vertebrae 7
These are readily identified by the foramen transversarium perforating the transverse processes. This foramen transmits the vertebral artery, the vein, and sympathetic nerve fibres. The spines are small and bifid except C1 and C7 which are single and the articular facets are relatively horizontal Fig. 229 . The atlas C1 Fig. 230 has no body. Its upper surface bears a superior articular facet on a thick lateral mass on each side which articulates with the occipital condyles of the skull. Fig....
Biologists explore life from lhe microscopic to the global scale
The study of liie extends from the microscopic scale of the molecules and cells that make up organisms to the global scale of Lhe enLire living planet. We can divide this enormous range into different levels o biological organization. e Energy processing. This hummingbird obtains fuel in the form of nectar from flowers. The hummingbird wil use the chemical energy stored in its food to power flight and other work. g Reproduction. Organisms living things reproduce their own kind-Here an emperor...
PROCEDURE PROPAGATION AND SUBCULTIVATION OF HUMAN DIPLOID CELLS IN 150cm2
This method describes the establishment and subcultivation of 150-cm2 cell cultures originating from a human diploid working cell bank. The harvests of these cultures will be used to seed further similar vessels or microcarrier culture systems. Ampoule vial of MRC-5 WI-38 Trypsin in phosphate-buffered saline PBS Dulbecco's modified Eagle's medium DMEM with 10 foetal bovine serum FBS 150-cm2 plastic culture vessels with a pipette and pro-pipetter, into a 150-cm2 100 ml of DMEM with 10 FBS. at 37...
Assay Techniques 1
3.3.1. Phenotypic and Functional Characterization of RAW-OCs Standard protocols can be used to evaluate the morphological light, scanning electron microscope , ultrastructural transmission electron microscope , histochemical general or enzymatic activity stains , or immunocytochemical staining e.g., for OC developmental markers characteristics of RAW cells representing pre-OCs and in vitro RANKL-formed RAW-OCs see Chapter 6 by Collin-Osdoby et al., this volume . Whereas untreated RAW cells do...
Antibiotics and Protein Synthesis
Many antibiotics work by blocking protein synthesis, a property that is extensively exploited in research and medicine. Many antibiotics only inhibit protein synthesis in bacteria and not in eukaryotes. They are therefore extremely useful in the treatment of infections because the invading bacteria will die but protein synthesis in the host organism remains unaffected. Examples are chloramphenicol, which blocks the peptidyl transferase reaction, and tetracycline, which inhibits the binding of...
C Capillary Electrophoresis of HA
Recent studies have applied the technique of capillary electrophoresis to the analysis of hyaluronan or its degradation products 52,53 . In capillary electrophoresis, electrophoresis is carried out in narrow 50-100 mm internal diameter silica capillaries at high voltages. In 'normal polarity' capillary zone electrophoresis, the capillary walls are uncoated and the pH is neutral or basic. This leads to deprotonation of silanol sites and causes the capillary wall to have an excess negative...
The Evolution of Learning
When organisms were faced with unpredictable and changing environments, natural selection favored those individuals whose behavior could be conditioned. Organisms who condition are more flexible, in the sense that they can learn the new requirements of the environment. Such behavioral flexibility must reflect an underlying structural change of the organism. Genes code for the anatomical and physiological characteristics of the individual. Such physical changes allow for different degrees of...
Bacteriocin Diversity
Surveys of colicin diversity in different collections of E. coli all give rise to similar results - only a small fraction of the known colicins are present in a given collection and, in general, different colicins are detected in different collections Riley and Gordon 1996 Table 2.1 . There are a few exceptions to this general trend - colicins E1 and Ia are often observed Riley and Gordon 1996 Table 2.1 . Colicin Ia is encoded on a conjugative plasmid and therefore is able to transfer among E....
Control of the renal circulation
The kidneys receive approximately 20 of cardiac output. They are capable of increasing flow even further, although they constitute less than 0.5 of the total body weight. This marked renal blood flow is well in excess of that required to provide renal tissue with sufficient oxygen and nutrients. Therefore, renal blood flow is regulated to maintain an optimum delivery of filtrate to the nephrons and adequate reabsorption of fluid back into the vascular system. The factors that control renal...
Adaphostin Tyrosine Kinase Inhibitor Or Nontyrosine Kinase Inhibitor
Adaphostin NSC 680410, National Cancer Institute, Bethesda, Maryland, U.S.A. is the adamanyl ester of the tyrphostin, AG957 10 . Tyrphostins are a group of structurally diverse compounds that were synthesized and evaluated as potential inhibitors of tyrosine kinases. AG957 was identified as a non-ATP inhibitor of p210Bcr-Abl 11 , which interfered with the binding of protein substrates to this tyrosine kinase. Several lines of evidence suggest that, currently, adaphostin should be considered as...
Segmental arid peripheral nerves of the limbs
Brachial plexus Cervical part 1 2 Branches from roots 1 3 Branches from trunks 1 A Axillary part 14 Branches from cords 1 4 Assessment of brachial plexus lesions 17-18 Axillary nerve 1 9 Radial nerve 19-21 Ulnar nerve 21-24 Median nerve 24-27 Lower limb myotomes 27 Lower limb dermatomes 7 Lumbosacral plexus 28 Femoral nerve 29 Common peroneal nerve 29 Tibial nerve 30-31 Sciatic nerve 3 1 Lateral cutaneous nerve of thigh 32 Neurological control of the bladder 32 The roots of the brachial plexus...
V Chemotherapy Regimens
As of this writing, the standard of care for cancer patients involves combinatorial regimens that often include agents belonging to separate classes of cytotoxic chemotherapy described in this chapter. Doses and scheduling have been determined over many years of experience and through use of evidence-based medicine through trial and error experiments based on the inherently empirical way , classical cytotoxic agents have been developed i.e., without direct reference to molecular mechanisms ....
Tips for optimizing color flow setup
1 According to standardized protocols, the carotid bifurcation should be to the left of the image. This orientation should then clearly indicate the appropriate direction of flow in the common carotid artery and jugular vein. The arterial and venous flow directions are then given color assignments with respect to flow towards or away from the transducer. Traditionally, flow towards the transducer is assigned red common carotid while flow away from the probe is assigned blue jugular vein . The...
Surgical Techniques
The heart is cannulated for cardiopulmonary bypass utilizing ascending aortic cannulation relatively high near the innominate artery and dual vena caval cannulas. Prior to aortic cross-clamping, the aorta and pulmonary artery are fully mobilized. There are usually adhesions from previous operations. After induction of cardioplegic arrest, a vertical aortotomy is performed, begun anteriorly and directed slightly to the left of the right coronary ostia Figure 36.1 . The aortotomy is retracted...
Glucuronic Acid
Heme Degradation - Erythrocytes have a lifetime of about 120 days. Aged erythrocytes are destroyed upon passage through the spleen or liver Figure 21.31 . The basic pathway of heme breakdown is Heme - gt Biliverdin - gt Bilirubin - gt passage through blood to liver as bilirubin-albumin complex - gt Bilirubin diglucuronide - gt excretion. Bilirubin is insoluble in aqueous solutions, so complexing with albumin and gluruonic acid is essential for passage through the body. Accumulation of bilirubin...
Von HippelLindau Syndrome
Von Hippel-Lindau VHL syndrome is an autosomal dominant disorder with an incidence of between Table 10.3 Genetic predisposing conditions. CHRPE Congenital hypertrophy of the retinal pigment epithelium, MPNST malignant peripheral nerve sheath tumor Table 10.3 Genetic predisposing conditions. CHRPE Congenital hypertrophy of the retinal pigment epithelium, MPNST malignant peripheral nerve sheath tumor Neurofibromas, optic nerve gliomas, astrocytomas, MPNST Caf au lait spots, axillary freckling...
The pterygopalatine ganglion
Associated with the maxillary division of V as it lies in the pterygopalatine fossa is the relatively large pterygopalatine ganglion. This receives its parasympathetic or secretomotor root from the greater superficial petrosal branch of VII, its sensory component from two pterygopalatine branches of the maxillary nerve and its sympathetic root from the internal carotid plexus. Its parasympathetic efferents pass to the lacrimal gland through a communicating branch to the lacrimal nerve. Sensory...
ANSWERS TO CASE 53 Parvovirus Infection in Pregnancy
Summary A 24-year-old G2 PI woman at 22 weeks' gestation complains of an episode of myalgias and low-grade fever I month ago. Her 2-year-old son had high fever and red cheeks. Fundal height is 28 cm. and fetal parts are difficult to palpate. Most likely diagnosis Hydramnios, with probable fetal hydrops due to parvovirus B19 infection. Most likely mechanism Fetal anemia due to neonatal parvovirus infection, which inhibits bone marrow erythrocyte production.
Heavy Metals
2.11.1 Mercury Compounds. In the past, mercuric chloride was used widely as an antisep tic, but its present use is limited to disinfecting instruments and occasional application to un-abraided skin. The most significant inorganic mercury compound is ammoniated mercury Hg NH2 Cl , which is used for skin infections such as impetigo. It is formulated as ammoniated mercury ointment, which contains 5 or 10 of the compound in liquid petrolatum and white ointment. Mercuric oxide HgO is used sometimes...
Regenerative Surgical Techniques
Regenerative periodontics can be subdivided into two major areas non-graft-associated new attachment and graft -associated new attac hment. Many techniques combine both approaches. All recommended techniques include careful and complete removal of all irritants. Although this can be clone in some cases as a closed procedure, in the great majority of cases it should be clone after exposure ol the area with a llap. Map design and incisions should follow the description given in Chapter 60 lor...
Mechanical Cardiac Pacing
Mechanical cardiac pacing techniques stimulate myocardial tissue by direct or transmitted physical forces. Clinically, these techniques include percussion pacing chest thumps administered by a medical attendant and cough-induced cardiac resuscitation performed by patients themselves. Although they are lacking in technical sophistication, these techniques persist as useful clinical maneuvers by virtue of their sheer simplicity and immediacy of application. Percussion pacing for bradyarrhythmias...
BIOREACTORS FOR SUSPENSION CELL CULTURES SmallScale Culture Systems
Small-scale culture systems are characterized by a relatively simple design and low level of instrumentation and control. Traditionally, roller bottles and spinner flasks have been used for small-scale suspension culture although even T-flasks, Petri dishes, multiwell plates, and other stationary culture systems are applicable for suspension cell propagation in small-scale. Spinner flasks Techne, Integra Biosciences, etc. are available from 125 mL to 5L working volume for operation in...
Construction of the Expression Plasmid for FullLength p53
The E. coli expression system used is based on the pQE-80L expression system. Sequences inserted into the multiple cloning site can be expressed as native proteins bearing an N-terminal hexahistidine tag upon IPTG induction of the T5 promoter in suitably transformed E. coli cells. 3.1.2. Amplification and Cloning of the Wild-Type p53 Gene As a Fusion to BCCP All DNA manipulations were carried out using standard recombinant DNA methods 18 to construct the expression plasmids, and are accordingly...
INTERNET LINK Metalloprotein Database
Some kinds of biological processes require catalytic functions beyond those built into protein molecules alone. In such cases, a protein may require the help of some other small molecule or ion to carry out the reaction. Molecules bound to enzymes for this purpose are called coenzymes. The water soluble vitamin B complexes are metabolic precursors of a number of coenzymes. Table 11.5 lists several important coenzymes together with their related vitamins. NAD - Nicotinamide adenine dinucleotide...
IV Conformation of Hyaluronan in Solution
With the premise that HA may self-associate, but the interactions may be weak and transient, we set out in our research group to investigate HA properties in concentrated solutions and look for evidence of self-association. For this study we used a newly developed technique, confocal-FRAP, which is uniquely suited for detecting weak associations and is able to study at high concentration, where chain-chain interaction could be expected to be maximal. This new technique could thus provide...
The TIMI risk score for unstable anginanonST elevation MI A method for
Context patients with unstable angina non-ST-segment elevation myocardial infarction MI UA NSTEMI present with a wide spectrum of risk for death and cardiac ischemic events. OBJECTIVE To develop a simple risk score that has broad applicability, is easily calculated at patient presentation, does not require a computer, and identifies patients with different responses to treatments for UA NSTEMI. DESIGN, SETTING, AND PATIENTS Two phase 3, international, randomized, double-blind trials the...
Clinical Relevance of Deletion 6q
In B-CLL patients with deletion 6q, shorter therapy-free intervals could be demonstrated, reflecting more rapid progression of the disease 18 . By contrast, however, no association of deletion 6q with shorter survival time was proved in the IWCCLL studies 19,21 . An interphase FISH study on 285 B-CLL patients revealed a correlation between deletion 6q and greater tumor mass, measured by leukocyte count median 49.3 x 109 L vs 31.7 x 109 L p 0.036 and lymphadenopathy 95 . The sum of the products...
Fumarate Hydratase Fumarase
m Fumarase is an enzyme of the citric acid cycle, glyoxylate cycle, and urea cycle that catalyzes addition of water to the double bond of fumarate to form L-malate. Fumarate H20 lt gt L-Malate AG' -3.8 kj mol . The enzyme is stereospecific, working only on the trans isomer. Next enzyme of citric acid cycle Previous enzyme of cycle See also Enzymes of the citric acid cycle, Intermediates of the Citric Acid Cycle, Pathway of the Citric Acid Cycle, Table 14.1
Surgical Technique Bst
Moderate to deep hypothermia is used in all cases with cannulation for bypass being achieved with an arterial cannula placed distally at the level of the innominate artery or beyond to permit wide mobilization of the ascending aorta. A single venous cannula in the atrial appendage is usually adequate. In most cases the procedure can be performed without a period of circulatory arrest other than for closure of the interatrial communication. Once on bypass, access to the left ventricular outflow...
Interferon
IFN-y is secreted by activated T-cells and NK cells. Immunologically, it is the most potent monocyte-macrophage activating factor 39 . The metabolic effects of IFN-y include inhibition of lipoprotein lipase, both in an adipocyte cell line and in vivo 61 . IFN-y also inhibits the production of lipoprotein lipase and glycerol-phosphate dehydrogenase, both of which are involved in lipogenesis in primary cultures of rat adipocytes 62 . In addition, IFN-y stimulates lipolysis in vitro and in vivo 63...
SF36v2 Acute
This survey asks for your views about your health. This information will help keep track of how you feel and how well you are able to do your usual activities. Thank you for completing this survey For each of the following questions, please mark an in the one boi that best describes your answer. 1. In general, would you say your health is 2, Compared to one week ago, how would you rate your health in general now Much better Somewhat About the Somewhat Much worse now than one better now same as...
Physiology of K Homeostasis
K are the most abundant cations in the body. Close to 98 of K 4000 mmol in a typical adult exist in the intracellular fluid ICF compartment and close to 60 mmol are in the extracellular fluid ECF compartment. The ratio of the concentration, K , in the ICF compartment to that in the ECF compartment reflects the resting membrane potential RMP . The RMP must remain relatively constant in the face of a daily intake of K that is roughly equal to the total content of K in the ECF. Regulation of K...
Right And Left Lateral Views
Locations on the Chest. Be familiar with general anatomic terms used to locate chest findings, such as Supraclavicular above the clavicles Infraclavicular below the clavicles Interscapular between the scapulae Infrascapular below the scapula Bases of the lungs the lowermost portions Upper, middle, and lower lung fields You may then infer what part s of the lung s are affected by an abnormal process. Signs in the right upper lung field, for example, almost certainly originate in the right upper...
Calvarial Explant Culture
1. Inject neonatal Balb c neonatal mice up to 2 d old intraperitoneally with 10 L of radiolabeled calcium. Inject enough mice to give four or five bones per treatment group in the experiment see Note 3 . 2. Euthanize the mice 5 d later by decapitation. 3. After exposing the calvaria and pinning back the skin, pipet 100 L of PBS with EDTA and heparin onto the surface of the calvaria to prevent blood coagulation. 4. Carefully dissect out the parietal bones Fig. 1 see Note 4 . 5. Place the...
Control of the cutaneous circulation
The potential for skin vessels to generate great increases in vascular conductance makes this circulation an important regional flow area during changes in the environment and during anaesthesia. Cutaneous resistance vessels and the venous plexus in the subcutaneous dermal junction are richly innervated with sympathetic vasoconstrictor nerves which maintain a relatively high degree of neurogenic activity and, hence, vascular tone. This predominant vasoconstrictor tone is mediated by hormonal...
Catalytic Mechanism of Peptide Bond CisTrans Isomerases
Despite the amount of data and the simplicity of the chemical reaction catalyzed, the molecular basis of the catalytic mechanism of PPIases and APIases is still only poorly understood 155 . The considerable degree of amino acid sequence dissimilarity between the subgroups of peptide bond cis-trans isomerases also raises the challenging question of the mechanistic relatedness among the enzymes. At present there is a lack of detailed mechanistic investigations on APIases and multidomain PPIases....
IV Gastrointestinal and Respiratory Epithelium
The upper gastrointestinal tract, including mouth, pharynx, and esophagus, is covered by a stratified epithelium, which is not keratinized but otherwise resembling that of epidermis. Hyaluronan fills the interstitium of the lower cell layers of these epithelia and gradually disappears when cells differentiate towards the surface Fig. 3a and b 28,29 . The decline of hyaluronan associated with the differentiation in the superficial esophageal epithelium is reversed in carcinoma in situ lesions,...
Vectors for Regulated Expression of Genes in Mammalian Cells
The promoters described in the preceding text are employed to drive constitutive transcription of cDNA, leading to continuous mRNA and protein synthesis. However, there are situations where regulated or induced gene expression is desired for instance, when an expressed protein is cytotoxic or cytostatic to host cells. To address these situations there have been several inducible mammalian expression systems developed. Early systems relied on inducers that had pleiotropic effects on host cells,...
Homocysteine
It was found recently that homocysteine, a well-known risk factor for cardiovascular diseases, is also a risk factor for malignant diseases 21,22 . Elevated serum or plasma homocysteine can be found in most cancer patients. Several biochemical changes, including folate deficiency, oxidative stress, aberrant DNA methylation, and production of homocys-teine thiolactone have been identified in association with hyperhomocysteinemia. All of the events mentioned above may lead to carcinogensis and...
Pathophysiology of Lipodystrophy Mechanisms of Lipodystrophy The Effects of
Different hypotheses have been put forward to explain the putative mechanism of HAART drugs in the development of lipodystrophy syndrome 116-120,122-124,126,134,141,147-152 . The first postulates that PIs primarily block cytochrome P450, which is involved in fat metabolism. The second postulates an interaction between PIs and human proteins. HIV protease has a sequence homology of 12 amino acids with two human proteins playing an important role in fat metabolism, namely, LDL-receptor-related...
Initiation of Cyclin B Destruction at the Centrosome
Following mitotic entry, the next critical transition point in the cell cycle is the metaphase to anaphase transition. This is under the control of the spindle assembly checkpoint, which prevents anaphase onset until all chromosomes have achieved attachment to opposite spindle poles reviewed in 58 . In an elegant approach that made use of cells containing two spindles, it was shown that one spindle could initiate anaphase despite the presence of mono-orientated chromosomes on the second spindle...
Computerbased decision aids
Acute cardiac ischemia time-insensitive predictive instrument The acute cardiac ischemia time-insensitive predictive instrument ACI-TIPI 26 computes a 0 to 100 probability that a given patient has ACS either acute MI or unstable angina pec-toris see Tables 1 and 2 . Applicable to any patient in the ED presenting with any symptom suggestive of ACS, it is based on a logistic regression equation that uses presenting symptoms and ECG variables. Originally in hand-held calculator form, it is now...