Lower Extremity Occlusive Disease
A great deal of interest has arisen in a non-invasive method of screening for lower extremity vascular disease. While duplex sonography and plethys-mography are quite reliable in identifying and localizing the general anatomic region involved, these tests cannot be used alone in planning en-dovascular procedures for the lower extremities. The specificities of these exams are diminished in the presence of multi-level disease. Fig. 6. Pelvic MRA shows severe tortuosity arrow of the iliac segment....
Key Clinical Terms
Acromegaly Overgrowth of bone and soft tissue, especially in the hands, feet, and face, ak-ro-MEG-a-le caused by an excess of growth hormone in an adult. The name comes from acro meaning extremity and megal o meaning enlargement. acromegaly Overgrowth of bone and soft tissue, especially in the hands, feet, and face, ak-ro-MEG-a-le caused by an excess of growth hormone in an adult. The name comes from acro meaning extremity and megal o meaning enlargement. A disease resulting from deficiency of...
Differentiation of the Genital Ducts Is Determined by Hormones
During the indifferent stage, the primordial genital ducts are the paired mesonephric wolffian ducts and the paired paramesonephric m llerian ducts. In the normal male fetus, the wolffian ducts give rise to the epididymis, vas deferens, seminal vesicles, and ejaculatory ducts, while the m llerian ducts become vestigial. In the normal female fetus, the m llerian ducts fuse at the midline and develop into the oviducts, uterus, cervix, and upper portion of the vagina, while the wolffian ducts...
Descent Of The Testis
Testicular development begins at conception under complicated genetic direction 22 . This involves a cascade of sequential steps under the control of numerous genes, most of which are yet to be identified. Key to testicular differentiation is the sex-determining region Y SRY gene. Genetic components upstream from SRY that are essential for gonadal development include splicing factor 1 SF1 , Wilm's tumor 1 gene WT1 , and Double sex and MAb-3-Related Transcription Factor 1 DMRT1 . Downstream from...
Plasmodesmata and material transfer between cells
Many substances move from cell to cell within the symplast by way of plasmodesmata see Figure 35.7 . Among their other roles, plasmodesmata participate in the loading and unloading of sieve tube elements. The mechanisms vary among plant species, but the story in tobacco plants is a common one. In tobacco, sugars and other solutes in source tissues enter companion cells by active transport from the apoplast and move on to the sieve tube elements through plasmodesmata. In sink tissues,...
Sunfish Pumpkinseed
The pumpkinseed is one of the most common and brightly colored members of the Centrarchidae family of sunfish. Although small on average, it is especially popular and good to eat. Identification. A brilliantly colored fish, the adult pumpkinseed is olive green, spotted with blue and orange and streaked with gold along the lower sides there are dusky chainlike bars on the side of juveniles and adult females. A bright red or orange spot is located on the back edge of the short, black ear flap....
Further Investigations
In many cases it is possible to make a reliable diagnosis from the history and clinical examination. I his applies, for example, to conditions such as bronchial asthma, chronic bronchitis and lo some cases of pneumonia and pulmonary infarction. At other times clinical examination fails to reveal any abnormality and the diagnosis depends entirely on specialised investigations, particularly radiology. Pulmonary tuberculosis and bronchial carcinoma are two important diseases which may not give...
A History of Endosymbiosis
As we have already seen, many protists possess chloroplasts. Groups with chloroplasts appear in several distantly related protist clades. Some of these groups differ in the photosyn-thetic pigments their chloroplasts contain. And we've seen that not all chloroplasts have a pair of surrounding mem-branes in some protists, they are surrounded by three membranes. We now understand these observations in terms of a remarkable series of endosymbioses. All chloroplasts trace their ancestry back to the...
Human ancestors evolved bipedal locomotion
The hominids the lineage that led to humans separated from other ape lineages about 6 mya in Africa. The earliest pro-tohominids, known as ardipithecines, had distinct morphological adaptations for bipedalism locomotion in which the body is held erect and moved exclusively by movements of the hind legs. Bipedal locomotion frees the forelimbs to manipulate objects and to carry them while walking. It also elevates the eyes, enabling the animal to see over tall vegetation to spot predators and...
Light and gravity affect the direction of plant growth
While polar auxin transport establishes the orientation of growth, lateral side-to-side redistribution of auxin is the mechanism that explains phototropism. This redistribution is carried out by an auxin carrier protein that moves to one side of the cell and thus allows auxin to exit the cell only from that side. When light strikes a grass coleoptile on one side, auxin at the tip moves laterally toward the shaded side. The imbalance thus established is maintained down the coleoptile, so that in...
EXPERIMENT 153 Bacterial Resistance to Antimicrobial Agents Enzymatic
The activity of antimicrobial agents is usually very specific, affecting primarily essential bacterial cell structures or biochemical processes. For example, penicillin interferes with bacterial cell wall synthesis, gentamicin inhibits protein synthesis, and sulfonamides block folic acid synthesis. During the few decades of widespread antimicrobial agent usage, it has become evident that bacteria have the ability to inactivate or in some way circumvent the activity of almost every known agent....
Additional Reading Eig
Abbott, I. A. Ed. . 1997. Taxonomy of economic seaweeds with reference to some Pacific species, vol. VI. La Jolla, CA University of California Sea Grant College System. Akatsuka, I. Ed. . 1995. Biology of economic algae. Champaign, IL Balogh Scientific Books. Becker, E. W. 1994. Microalgae Biotechnology and microbiology. New York Cambridge University Press. Bhattachyra, D. 1998. Origins of algae and their plastids. New York Springer-Verlag. Cox, E. J. 1996. Identification of freshwater diatoms...
Populations in Space and Time
The individuals of a species within a given area constitute a population. At any given moment, an individual organism occupies only one spot in space, and is of a particular age and size. The members of a population, however, are distributed over space, and they differ in age and size. The distribution of the ages of individuals in a population and the way those individuals are distributed over the environment describe population structure. Ecologists study population structure because the...
Pathogenesis of Urethral Strictures
Strictures used to stem predominantly from infectious disease sexually transmitted diseases, tuberculosis today most of the strictures are post-traumatic or iatrogenic. External trauma is caused by injuries such as a fracture of the pelvis. Internal traumatic lesions, mostly of the bulbar urethra, are attributable to endoscopic instruments and urethral catheters. Pathogenic factors include mucosal lesion, inflammation, and locally reduced perfusion. The pathoge-nesis of urethral strictures...
Muscle Strength and Performance
Muscle fiber types determine endurance and strength Not all skeletal muscle fibers are alike, and a single muscle contains more than one type of fiber. The two major types of skeletal muscle fibers differ in the properties of their myosin molecules, and these myosin variants have different rates of ATPase activity. Those with high ATPase activity can recycle their actin-myosin cross-bridges rapidly and are therefore called fast-twitch fibers. Slow-twitch fibers have lower ATPase activity, so...
Condensation and Hydrolysis Reactions
Polymers are constructed from monomers by a series of reactions called condensation reactions or dehydration reactions both terms refer to the loss of water . Condensation reactions result in covalently bonded monomers Figure 3.3a and release a molecule of water for each bond formed. The condensation reactions that produce the different kinds of polymers differ in detail, but in all cases, polymers form only if energy is added to the system. In living systems, specific energy-rich molecules...
Perfusion MRI of the Small Bowel to Assess Mesenteric Ischemia
Perfusion imaging as a noninvasive method has been widely used for the determination of myocardial blood flow 34 . Cardiac perfusion examinations are usually performed during baseline conditions as well as during pharmacologically induced hyperemia 35,36 . Thus, a myocardial perfusion reserve can be determined, which accurately depicts individual graded coronary lesions 35 . This pathophysiological background can be transferred from myocardial perfusion to visceral perfusion, since processes in...
The Regulation of Muscle Blood Flow Depends on Many Mechanisms to Provide
As discussed in Chapter 16, many potential local regulatory mechanisms adjust blood flow to the metabolic needs of the tissues. In fast-twitch muscles, which primarily depend on anaerobic metabolism, the accumulation of hydrogen ions from lactic acid is potentially a major contributor to the va-sodilation that occurs. In slow-twitch skeletal muscles, which can easily increase oxidative metabolic requirements by more than 10 to 20 times during heavy exercise, it is not hard to imagine that...
Clinical Manifestations
Infective endocarditis, as it presents in the elderly population, can be extremely diverse in its clinical manifestations. Although initially these clinical manifestations can be extremely minimal or absent and seemingly unimportant, the physician must constantly be on the alert or infective endocarditis will elude diagnosis. The difficulty of diagnosis of infective endocarditis in the elderly has been noted many times before 4 . The elderly patient may have nonspecific symptoms such as...
Palpation
Palpation can be conveniently divided into three phases light, deep and palpation during respiration. The tendency to contract the abdominal muscles may be minimised by ensuring that the patient is warm and comfortable and by-gaining the patient's confidence with a gentle approach. The rlipping technique may be useful during deep palpation in patients with marked ascites to detect the presence of hepatic or splenic enlargement and map the outlines of enlarged organs or of tumours that might...
Responses to Disease
A common response to infection and to other forms of disease is inflammation. When cells are injured, they release chemicals that allow blood cells and fluids to move into the tissues. This inflow of blood results in the four signs of inflammation heat, pain, redness, and swelling. The suffix -itis indicates inflammation, as in appendicitis inflammation of the appendix and tonsillitis inflammation of the tonsils . FIGURE 6-2. Rod-shaped and curved bacteria. Reprinted with permission from Cohen...
Presynaptic VoltageGated Calcium Channels
Chemical synaptic transmission begins when an action potential reaches the nerve terminal and opens voltage-gated Ca2 channels, leading to an influx of Ca2 and con- Amplitude of end-place potentials mV Figure 7.3 Theoretical distributions for epps consisting of integer multiples of the spontaneous epp, which is the basic building block, or quantum, of the epp. Summation of these curves for all integral numbers of quanta gives the theoretical prediction for the overall amplitude distribution,...
Fundamental Equipment and Instruments
The following list summarizes the fundamental instrumentation necessary to initiate laparoscopic colorectal surgery Laparoscopes 10 mm 0 , 30 5 mm 0 , 30 Laparoscopic camera - single- or three-chip camera Monitors 2 - standard analog cathode ray tube or digital flat-screen High-flow CO2 insufflator gt 6 L min with digital intraabdominal pressure, volume, and gas display CO2 reservoir as a tank or a connection to a wall reservoir Standard surgical instruments to incise the skin, establish trocar...
Springer
Giles R. Scuderi, M.D. Alfred J. Tria, Jr., M.D. Insall Scott Kelly Institute Orthopaedic Center of New Jersey 178 East 85th Street 1527 State Highway 27, Suite 1300 New York, NY 10028 Somerset, NJ 08873 USA Library of Congress Control Number 2005938493 ISBN-10 0-387-30730-3 ISBN-13 978-0387-307305 2006 Springer Science Business Media, Inc. All rights reserved. This work may not be translated or copied in whole or in part without the written permission of the publisher Springer Science Business...
Workbook in MicrobiologyLaboratory Techniques 7e
Table 28.2 Some Important Genera of Anaerobic Bacteria Table 28.2 Some Important Genera of Anaerobic Bacteria C. perfringens gas gangrene C. tetani tetanus C. botulinum botulism Actinomyces Eubacterium Propionibacterium Infections of female genital tract, intraabdominal infections, endocarditis Difficult to assess has had clinical significance in cultures of blood, bone marrow, and spinal fluid Occasionally isolated from blood significance not established Fusobacterium and Prevotella...
Chordates New Ways of Feeding
Members of the second major lineage of deuterostomes evolved several modifications of the coelom that provided new ways of capturing and handling food. They evolved a strikingly different body plan, characterized by an internal dorsal supporting structure. The pharyngeal slits, which originally functioned as sites for the uptake of O2 and elimination of CO2, and for eliminating water, were further enlarged. The result was a phylum Chordata of bilaterally 34.6 Urochordates a The tunic is clearly...
Alternative Surgical Techniques Wfg
There is a role for extracranial techniques where there is an extensive defect, further cosmetic craniofacial reconstruction is needed, or it is not possible to visualize the defect. Where there is a large defect or multiple defects of the skull base, an external transethmoidal approach followed by peeling down the mucosa from around the defect, be it the septum or the middle turbinate, exposes the defect, which is then covered by fascia and fat before the unpeeled mucosa is replaced Simmen et...
Ventricular Rate Control
As the natural history of AF progresses from brief paroxysms to persistent episodes and on to permanent AF, often despite the physician's attempts at maintenance of sinus rhythm, rate control is of paramount importance. Failure to maintain reasonable rate control is associated with significant morbidity, disabling symptoms, and a very poor quality of life for the patient. Hemodynamic and structural changes occur within a few weeks when median heart rates are elevated generally above 100 BPM...
Simple unidirectional flow isolators
Simple, unidirectional flow isolators may be positive or negative pressure they may exhaust to the room, or the exhaust may be ducted to the atmosphere. In either case, the design problems are similar to those for turbulent flow, except that the flow rates are one or two orders of magnitude greater. Exhaust to the room makes control a little simpler, especially for the double-fan case, but the fans will dump an appreciable heat burden into the room. Ducted exhaust to the atmosphere, on the...
Foreword To The First Hungarian Edition
With the pooling of our experiences and results in the treatment of femoral neck fractures extending over four decades we intend to contribute to the development of surgery for hip fractures. The evolution of trauma surgery and of medical technology has allowed the elaboration of a treatment concept and methodology based on experimentally proven, clinically verified and finally postoperatively confirmed results. Improvements of implants and in particular the introduction of image intensifiers...
PituitaryOvarian Axis
The term pituitary-ovarian axis refers to the hormonal interactions between the anterior pituitary and the ovaries. The anterior pituitary secretes two gonadotropic hormones follicle-stimulating hormone FSH and luteinizing hormone LH both of which promote cyclic changes in the structure and function of the ovaries. The secretion of both gonadotropic hormones, as previously discussed, is controlled by a single releasing hormone from the hypothalamus gonadotropin-releasing hormone GnRH and by...
Pathogenesis
The term pathogenesis covers the factors that contribute to the origins and development of a disease. In the case of viruses, the infection is by a parenteral or mucosal route. The viruses either replicate at the portal of entry only local infection or reach their target organ hematogenously, lympoge-nously or by neurogenic spread generalized infection . In both cases, viral replication induces degenerative damage. Its extent is determined by the extent of virus-induced cell destruction and...
Jitteriness
Jitteriness is a common movement phenomenon in the newborn period. Jitteriness is associated with drug withdrawal, hypocalcemia, hypoglycemia, and hypoxic-ischemic encephalopathy. Movements typically have an oscillating quality, with to and fro oscillations of equal frequency and amplitude. Jitteriness can occur spontaneously, but is also very stimulus-sensitive and can often be precipitated by touch or loud noise. In addition, the movements can be dampened by consoling the child, removing the...
Retroviruses
Retroviruses possess an enzyme, reverse transcriptase, that can transcribe ssRNA into double-stranded DNA. This activity is reflected in the designation retroviruses. Integration of the DNA thus derived from the viral genome in the host-cell genome is a precondition for viral replication. Certain retroviruses are also capable of oncogenic cell transformation. Due to this potential and their RNA genome, these viruses are also called oncornaviruses see Chapter 7 . Human pathogen retroviruses...
Mountain and Coastal Forest
In the geologic past, deciduous forests extended to western North America. As the climate changed and summer rainfall was reduced, conifers largely replaced the deciduous trees, although some e.g., maple, birch, aspen, oak still remain, particularly at the lower elevations. Today, coniferous forests occupy vast areas of the Pacific Northwest and extend south along the Rocky Mountains and the Sierra Nevada and California coast ranges. Isolated pockets of the mountain and coastal biome also occur...
Chapter Review 151
Match the following terms and write the appropriate letter to the left of each number _ 1. clitoris a. muscle of the uterus _ 2. myometrium b. fallopian tube _ 3. oviduct c. release of an egg from the ovary _ 4. ovulation d. external female genitalia _ 5. vulva e. female erectile tissue 9. gynecogenic 10. menostasis a. producing female characteristics e. removal of the entire uterus outermost layer of the embryo sac that holds the fetus period of development in the uterus fertilized egg lack of...
Elephants 1
Herbivorous elephants, the largest land animals, eat three hundred pounds per day of grass, fruits, leaves, flowers, roots, twigs, branches, and bark. Elephants are African or Asian. African males reach twenty-five feet long, eleven feet tall, and weigh seven tons. Females are shorter and half the weight of males. Asian elephants exhibit anatomic differences, including smaller ears, tusks, and overall size. Elephants lift trees with their trunks and have long been domesticated to carry things....
Immunostimulation
The aim of immunological treatment of infections and tumors is to enhance immune responsiveness via the use of thymic hormones thymopoietin, pen-tapeptides , leukocyte extracts, or interferons. Derivatives or synthetic analogs of microorganisms such as BCG, components of Corynebacteriumparvum and peptidoglycans e.g., muramyl peptide , or oligonucleic acids CpG , are used as adjuvants. Components of streptococci and Streptomyces, eluates and fractions of bacterial mixtures, and the related...
Surgical Procedures
The minor surgery room is 12X12 feet, with a long sink cabinet along one wall. Medical equipment to be accommodated in this room would depend on the scope of the procedures. However, the equipment would include an operating table or chair that adjusts to different positions Figure 4-114 and a ceiling-mounted surgical light over the table. If an office-based surgery suite is required, consult the Plastic Surgery section of this chapter. Dermatologists perform many surgical procedures in the...
ExcitationContraction Coupling
As described in Chapter 11, the mechanism that couples excitation an action potential in the plasma membrane of the muscle cell and contraction is an increase in the cell's cytosolic calcium concentration. As is true for skeletal muscle, the increase in cytosolic calcium concentration in cardiac muscle is due mainly to release of calcium from the sarcoplasmic reticulum. This calcium combines with the regulator protein tro-ponin, and cross-bridge formation between actin and myosin is initiated....
Differential Diagnosis
Dislocated distal interphalangeal DIP joint Figure 38 1. Attitude of a finger with the inability to extend the Figure 38 2. Radiograph, splay lateral, demonstrating a mallet of tip sitting at 45 degrees. the ring finger of a different patient. Figure 38 1. Attitude of a finger with the inability to extend the Figure 38 2. Radiograph, splay lateral, demonstrating a mallet of tip sitting at 45 degrees. the ring finger of a different patient.
An animals sensitivity to temperature can change
The body temperature of some animals is tightly coupled to the environmental temperature. Think of a fish in a temperate-zone pond. As the temperature of the pond changes from 4 C in midwinter to 24 C in midsummer, the body temperature of the fish does the same Figure 41.6 . We can bring the fish into the laboratory in the summer and measure its metabolic rate the sum total of the energy turnover of its cells, often measured by O2 consumption . If we measure its metabolic rate at different...
Sources of energy can be stored in the body
Although the cells of the body use energy continuously, most animals do not eat continuously. Therefore, animals must store fuel molecules that can be released as needed between meals. Carbohydrates are stored in liver and muscle cells as glyco-gen, but the total glycogen store represents only about a day's basal energy requirements 1,500-2,000 Cal . Fat is the most important form of stored energy in the bodies of animals. Not only does fat have more energy per gram than glycogen, but it can be...
Erythrocytes
The major functions of erythrocytes are to carry oxygen taken in by the lungs and carbon dioxide produced by cells. Erythrocytes contain large amounts of the protein hemoglobin with which oxygen and, to a lesser extent, carbon dioxide reversibly combine. Oxygen binds to iron atoms Fe in the hemoglobin molecules. The average concentration of hemoglobin is 14 g 100 ml blood in women and 16 g 100 ml in men. Further description of hemoglobin structure and functions is given in Chapter 15, where the...
Blood vessels
Palmar erythema is a mottled, bright-red cutaneous vasodilatation seen mainly over the thenar and hypothenar eminences. Though found in normal persons, it is suggestive of liver dysfunction. Arteritis may occur in infective endocarditis and in connective tissue disorders it may cause small necrotic lesions around the base of the nail and Fig. 2.30 The linear marks of intravenous injection at the right elbow. Fig. 2.30 The linear marks of intravenous injection at the right elbow. un the pulps,...
HIV replication
HIV can infect T4 lymphocytes and other cells bearing the CD4 marker on their surface. The CD4 molecule is the main receptor for HIV, or more precisely for its gp120 Fig. 8.14 . In addition, either the chemokine receptor CCR5 macro-phage-tropic R5 HIV strains or CXCR4 T cell-tropic X4 strains is used as a core-ceptor. Persons with homozygotic missing CCR5 are highly resistant to HIV infection. A number of other coreceptors are also active depending on the viral strain involved. HIV is then...
Tricks 1
Time Resolved Imaging of Contrast Kinetics TRICKS 7 uses an increased sampling rate for lower frequencies, temporal interpolation of k-space views, and zero-filling in the slice-encoding direction. When appropriately combined, these elements permit reconstruction of a series of 3D image sets, having an effective temporal frame rate of one volume every two to six seconds, with no serious compromise in spatial resolution. Conversely, given thelimited duration of the bolus of contrast agent in the...
Sensitization Stage
During the sensitization phase, CD4 and CD8 T cells recognize alloantigens expressed on cells of the foreign graft and proliferate in response. Both major and minor histocompatibility alloantigens can be recognized. In general, the response to minor histocompatibility antigens is weak, although the combined response to several minor differences can sometimes be quite vigorous. The response to major histo-compatibility antigens involves recognition of both the donor MHC molecule and an...
The Pumpkin Family Cucurbitaceae
Although most species in the Pumpkin Family are tropical or subtropical, many occur in temperate areas of both the Northern and Southern Hemispheres. Plants are prostrate or climbing herbaceous vines with tendrils. The flowers have Figure 24.22 A water hemlock in flower. Figure 24.22 A water hemlock in flower. Flowering Plants and Civilization 479 fused petals, and female flowers have an inferior ovary with three carpels. All are unisexual. Some species have both male and female flowers on the...
Physical Examination Ywy
No wrist swelling or obvious deformity was noted. There was point tenderness dor-sally over the triquetrum. Range of motion was diminished in all planes. A painful clunk was palpable with radial-ulnar deviation. Compression of the triquetrum with a radially directed force elicited pain. Excessive laxity was present with lunotriquetral LT ballottement when compared with the contralateral wrist. Grip strength was reduced 20 compared with the contralateral, nondominant side. He was neurovascularly...
