TY - JOUR. T1 - Trophic effect of transferrin on amphibian limb regeneration blastemas. AU - Mescher, Anthony. AU - Munaim, S. I.. PY - 1984. Y1 - 1984. UR - http://www.scopus.com/inward/record.url?scp=0021280796&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0021280796&partnerID=8YFLogxK. M3 - Article. VL - 230. SP - 485. EP - 490. JO - Journal of Experimental Zoology Part A: Comparative Experimental Biology. JF - Journal of Experimental Zoology Part A: Comparative Experimental Biology. SN - 0022-104X. IS - 3. ER - ...
A method and apparatus for anchoring suture to bone includes an anchor formed by twisting a wire to provide a loop with two legs extending distally from the twist. Each leg bends outwardly through 180 to define respective knee segments between inner and outer leg segments, the outer leg segments terminating in sharp points for penetrating a bone tunnel wall. The outer leg segments are initially parallel and define an anchor width smaller than the bone tunnel diameter, thereby permitting the anchor to be inserted into and removed from the tunnel. The anchor is deployed with an insertion tool arranged to deformably pivot the outer leg segments about the knee segments, thereby causing the pointed ends to penetrate the tunnel wall in response to applied withdrawal forces. The anchor wire may be assembled on an anchor sleeve through which the loop projects proximally while the outer leg segments reside in wire relief recesses defined in the sleeve periphery. The insertion tool selectively forces the sleeve
To investigate whether the uniqueness of proximal and distal limb regenerates could be attributed simply to differing blastemal growth characteristics, their increase in volume, cell number and cell-cycle times were determined. With respect to these parameters proximal and distal blastemas were identical and, furthermore, no evidence could be found for the existence of separate growth zones such as an apical proliferation centre or a progress zone within the blastema. It was therefore concluded that level-specific properties of the blastemal cells play the major role in determining the structure of the regenerate, not their growth characteristics. The only discernible difference was in the cell number within the two types of blastema at the onset of cartilage redifferentiation- proximal regenerates had 60 % more cells. Thus it seems that the larger the pattern to be regenerated (the more proximal the amputation plane), the larger the primordium within which that pattern first appears. These two ...
Subdividing cell populations in the developing limbs of Drosophila: do wing veins and leg segments define units of growth control?
An extraction device comprising a sheath, distal legs that project from the sheath, and actuating means for retracting the legs into the sheath and deploying the distal legs from the sheath. The distal legs are formed to have a parabolic curved shape, such that the distal legs automatically deploy radially outward and away from each other when deployed outside the sheath with the actuating means. As such, a plunger is not required to operate the legs. When retracted into the sheath with the actuating means, the distal legs elastically deform, collapsing radially toward each other to acquire a mid-deployed position in which the legs define a basket. The legs can be further retracted into the sheath, providing a stowed position in which the legs are substantially parallel to each other. Each of the distal legs has a concave cross-section that contributes greater strength to the legs, such that they maintain their form and alignment and provide greater grasping strength and expansion force than extraction
A device compressing a flexible elongate member having proximal and distal extremities and having a plurality of circumferentially spaced-apart elements having a characteristic disposed in the distal
Manson, J.M. and Smith, C.C. (1977) Influence of Cyclophosphamide and 4-Ketocyclophosphamide on Mouse Limb Development. Teratology, 15, 291-299.
The development of a vertebrate embryo is a complex process marked by several morphogenetic events, which create a highly reproducible pattern. The vertebrate limb has emerged as a model for studying pattern formation in the embryo mainly because limb manipulations do not affect embryo survival. Within the developing limb, experimental manipulation of the embryo resulted in the identification of the classical signaling centers known as the Zone of Polarizing Activity (ZPA) and the Apical Ectodermal Ridge (AER). The molecular signals required for function of the ZPA and AER have been identified. They are Sonic hedgehog (Shh) from the ZPA and Fibroblast Growth Factors (Fgfs) from the AER. The functions of each of these molecules are now beginning to be understood. Analysis of Shh and hedgehog (Hh) signaling target genes has shown that Hh activation in the limb bud mesoderm is required for normal limb development. It has been stated that Hh signaling in the limb bud ectoderm cannot occur because ...
Goggin JM, Hoskinson JJ, Carpenter JW, et al. Vet Radiol Ultrasound 1997;38:211-220. To assess the role of scintigraphic evaluation of distal limb perfusion,
Our data confirm that the timing mechanism does not rely on the integration of FGF signaling over time (Fig. 4), something that was previously suggested by the inability of excess FGF to activate Hoxa13 prematurely (Fig. 3) (Vargesson et al., 2001). Importantly, this does not mean that FGF signaling is not necessary for Hoxa13 expression during normal limb development. Indeed, we show that FGF signaling is needed to keep RA signaling away from the distal region, but that its role is merely permissive and not instructive: if RA signaling is artificially blocked from the distal region, the timing mechanism can proceed in the absence of FGF signaling (Fig. 4).. The alternative mechanism that we explored concerns chromatin state. It has been proposed that regulation of HoxD expression differs considerably between the limb [two transcriptional waves dependent on the interaction of Hox loci with distinct topological domains (Andrey et al., 2013; Montavon et al., 2011)] and the tail bud [strict ...
The upper and lower limbs (including the shoulder and pelvic girdles) begin development in the 4th week of gestation. Their embryological development is of great clinical and anatomical importance.
Our group focuses on the study of the cellular and molecular mechanisms controlling limb development and fin regeneration. We are trying to understand how the main signalling centre in limb development, the Apical Ectodermal Ridge (AER), is established and maintained through development and how different molecules, namely those related to stemness, are involved in these processes. Also, we have developed a line of research directed to depict how ion dynamics can control limb development, digit differentiation and fin regeneration. In these studies we use the chicken and zebrafish embryos as well as adult zebrafish as animal models.. ...
The present invention relates to a steerable catheter (21) comprising a flexible elongate tubular member (22) having proximal (23) and distal (24) extremities, a handle (27) secured to the proximal extremity (23), said tubular member (22) having a lumen (31-37) extending therethrough, a mandrel (41,42,43) slidably mounted in the lumen (31-37) and extending into the distal extremity (24) and means (56) extending through the tubular member (22) for causing a bending of the distal extremity (24) with respect to the mandrel (41,42,43) disposed therein.
A large-diameter expandable sheath for use in introducing a catheter or other medical instrument into a vessel in the body of a patient. The expandable sheath comprises an elongate sheath tube formed of a flexible material which has proximal and distal extremities and a passage extending therethrough of a maximum predetermined diameter. The distal extremity of the elongate sheath tube is folded longitudinally to a smaller folded diameter. The sheath tube may be self-expanding or may be reinforced with a self-expanding wire or expandable stents. A backflow adapter is secured to the proximal extremity of the elongate sheath tube. The backflow adapter has a central opening therein in registration with the passage in the sheath tube. A normally closed primary valve is disposed in the central opening of the backflow adapter and is movable to an open position. A normally open secondary valve, movable to a closed position, may be configured in the backflow adapter proximal the sheath tube and distal the
The mapping and/or ablation catheter for use in ablating the tissue in the wall forming a chamber in the heart comprising a flexible elongate tubular member having proximal and distal extremities, end cap formed of a conductive material mounted on the distal extremity of the flexible elongate tubular member, a fixation means carried by the end cap for engaging the wall of the heart and for retaining the end cap in a predetermined position on the wall of the heart during beating of the heart, said fixation means being movable between tissue engaging and disengaging positions. The means carried by the proximal extremity of the flexible elongate tubular member for moving the fixation means between the engaging and disengaging positions.
2017, Northcentral University, Murats review: "Lasix 100 mg, 40 mg. Trusted online Lasix.".. On examination, her temperature is F (C), her respiratory rate is breaths/min, and rhonchi are noted in both lung fields. When VZV vasculopathydevelops months after zoster, antiviral treatment is often effective. Findings on plain film (such as the colon cutoff sign; enhance-ment of perirenal fat caused by retroperitoneal inflammation that creates a halo aroundthe left kidney; or an abnormal duodenal loop) can suggest the diagnosis of pancreatitisbut do not reveal its cause. A ratio of pleural lactate dehydrogenase (LDH) to serum LDHgreater than C. Definitive diagnosis depends on radiographic detection of a mass lesion; treat-ment with drainage may be indicated. As the patient sits in the clinic chair, her distal extremities are seen to be a deep red, andthe skin of the distal extremities is smooth and thin, without hair. Structurally, however, plexiform bone resembles highly oriented cancellous bone. ...
Apparatus for cleaning a vessel having a stenosis therein comprising first and second balloon catheters. Balloons are disposed on opposite sides of the stenosis in the vessel and form a closed chamber in the vessel. A therapeutic catheter having a distal extremity is disposed in the chamber. Irrigation liquid is supplied to the chamber and liquid is aspirated from the chamber to form an aspirate. The distal extremity of the therapeutic catheter is moved to cause the material forming the stenosis to be removed from the wall of the vessel and to be broken into particles which are removed with the aspirate.
Lau K, Tao H, Liu H, Wen J, Sturgeon K, Sorfazlian N, Lazic S, Burrows JT, Wong MD, Li D, Deimling S, Ciruna B, Scott I, Simmons C, Henkelman RM, Williams T, Hadjantonakis AK, Fernandez-Gonzalez R, Sun Y, Hopyan S. Anisotropic stress orients remodelling of mammalian limb bud ectoderm. Nat Cell Biol. 2015 May; 17(5):569-79 ...
PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
There is no obvious morphological counterpart of the autopod (wrist/ankle and digits) in living fishes. Comparative molecular data may provide insight into understanding both the homology of elements and the evolutionary developmental mechanisms behind the fin to limb transition. In mouse limbs the autopod is built by a "late" phase of Hoxd and Hoxa gene expression, orchestrated by a set of enhancers located at the 5 end of each cluster. Despite a detailed mechanistic understanding of mouse limb development, interpretation of Hox expression patterns and their regulation in fish has spawned multiple hypotheses as to the origin and function of "autopod" enhancers throughout evolution. Using phylogenetic footprinting, epigenetic profiling, and transgenic reporters, we have identified and functionally characterized hoxD and hoxA enhancers in the genomes of zebrafish and the spotted gar, Lepisosteus oculatus, a fish lacking the whole genome duplication of teleosts. Gar and zebrafish "autopod" ...
Since I still dont understand your point, let me just say this: When scientists interpret the pentadactyl limb as homologous across tetrapods, they assume that changing the basic structure of the limb bones is more difficult than simply altering their relative proportions. Some scientists may also surmise that a creator is free to modify his (its) designs to maximise their usefulness, so wed expect substantially different limb structures across creatures in different environments. This evidence is indeed entangled in background assumptions. Yet look where this leads: given the above, the pentadactyl limb suggests a common ancestor for tetrapods under evolutionary theory. The theory then predicts that other measures of relatedness will group tetrapods together relative to other creatures. So look at the pentadactyl limb as a prediction, with subsequent analyses verifying that prediction. Now its true that you cant use the same evidence to generate and test a hypothesis, so under this ...
tuning would apply to more complex future models. In terms of the physiological simplifications, the interactions among F-V and F-L effects are potentially confounding given that large length changes reduce the optimal V/Vmax for producing power [43]. However, recent work demonstrates that muscle contractions beginning at longer starting lengths (stretched slightly beyond optimal length) enable the muscle to reach the plateau of the F-L curve at the time of maximum muscle activation [22]. Thus, at the time point of peak activation and muscle power, F-L effects would not influence maximum muscle power for the current model. Indeed, our in silico-robotic experiments, which do include F-L effects, match well with our simple model predictions (figure 6).. Secondly, experiments were performed in still water without translational motion of the foot. In a simple rower (figure 2d), oar blades would have an aft-directed rotational and translational component as they rotate about their base. Therefore, in ...
Published in Nature Communications, the study paves the way to research into the function of this pathway in vertebrate development and its possible involvement in human congenital diseases.
Fearful frustrated parents deliver their ill appearing 17-year-old daughter to your office for evaluation of persistent painful papules and plaques associated with high fever, sore throat, and arthralgias (fig1, 2, 3). The eruption first appeared on the distal extremities 3 days ago and has now disseminated to the proximal extremities and trunk. She was sent home from the local emergency room yesterday with instructions to take plenty of fluids and ibuprofen ...
Introduction:Acute discoloration and paresthesia of a distal extremity is concerning for an ischemic event or a manifestation of underlying systemic disease. Achenbach syndrome is an infrequent, but benign etiology of an acute blue finger that needs to be recognized clinically. We present a case to increase awareness. Case:A 57-year-old Caucasian female presented to rheumatology clinic for bruising digits.
An endocardial catheter for mapping and/or ablation for use in a chamber of a heart defined by a wall comprising a flexible elongate tubular member having proximal and distal extremities. A basket ass
(2001) BMP controls proximodistal outgrowth, prescritpion induction of the apical ectodermal ridge, and dorsoventral patterning in the vertebrate limb. Titrate with 0.
Where two or more injections are required at once, these should ideally be given in different limbs. Where this is not possible, injections in the same limb should be given 2.5cm apart. ...
Kid-sized for shredding singletrack, the Boys Hotrock 24 XC comes equipped with everything your little ripper needs to start riding with the big kids. It features a lightweight, yet durable, A1 Premium aluminium frame thats designed to take a hit while they find their legs on the pump track, while chatter and bumps are handled by the coil-sprung SR Suntour forks 50mm of travel. Then there are a whole host of other components that are plenty tough enough to stand up to your little one, so you can rest assured that youll be spending more time riding with your kid then waiting in line at the repair counter.
The purpose of this study was to examine how the limb segment inertial parameters vary across the decades from the 1920s to the 1970s. Sixty-six males participated in this study, ranging in age from 20 to 79 years ...
Even if you feed your dog properly, treat it well, make sure it is active, and demonstrate great prudence, it can still get sick or wounded. You will mostly find out about that only after you realize that your dog is behaving abnormally. Injuries could be anywhere in the body, but most often the limbs are involved ...
New Components of Drosophila Leg Development Identified through Genome Wide Association Studies. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
Montgomery EA, Devaney KO, Giordano TJ, Weiss SW. Inflammatory myxohyaline tumor of distal extremities with virocyte or Reed-Sternberg-like cells: a distinctive lesion with features simulating inflammatory conditions, Hodgkins disease, and various sarcomas. Mod Pathol 1998 Apr;11(4):384-91 ...
TY - JOUR. T1 - The expression of Fat-1 cadherin during chick limb development. AU - Terence , Smith. AU - Hateren, Nick Van AU - Tickle, Cheryll. AU - Wilson, Stuart PY - 2007. Y1 - 2007. N2 - Cellular adhesion is fundamental to the behaviour of cell populations during embryonic development and serves to establish correct tissue pattern and architecture. The cadherin superfamily of cell adhesion proteins regulates cellular organization and additionally influences intracellular signalling cascades. Here we present for the first time a detailed account of chick Fat-1 gene expression during embryogenesis visualised by whole-mount in situ hybridisation. In part, we focus on the expression pattern in limb buds that has not been accurately documented. While Fat-1 is generally expressed in epithelial tissues and its Drosophila counterpart Fat-like regulates formation of ectodermally-derived organs, in limb buds we have found that chick Fat-1 is uniquely restricted to mesenchyme. This Fat-1 expression ...
A new study has provided more insight into the effortless manner in which insects like mosquitoes and water striders are able to walk on water. The secret seems
Considerable evidence exists to support the hypothesis that mechanical forces have an essential role in healthy embryonic skeletal development. Clinical observations and experimental data indicate the importance of muscle contractions for limb development. However, the influence of these forces is seldom referred to in biological descriptions of bone development, and perhaps this is due to the fact that the hypothesis that mechanical forces are essential for normal embryonic skeletal development is difficult to test and elaborate experimentally in vivo, particularly in humans. Computational modeling has the potential to address this issue by simulating embryonic growth under a range of loading conditions but the potential of such models has yet to be fully exploited. In this article, we review the literature on mechanobiology of limb development in three main sections: (a) experimental alteration of the mechanical environment, (b) mechanical properties of embryonic tissues, and (c) the use of ...
Steerable balloon dilatation catheter assembly having dye injection and pressure measurement capabilities and comprising an elongate flexible tubular member having first and second lumens extending therethrough and a balloon carried by the distal portion of the tubular member and having its interior in communication with the second lumen. A guide wire extends through the first lumen and has a coil carried by the distal portion thereof and extending beyond the distal extremity of the tubular member. A device is coupled to the guide wire facilitating at least limited rotation of the distal extremity of the guide wire. A first fitting is coupled to the second lumen and is adapted to receive a liquid for inflating and deflating the balloon. A second fitting is in communication with the first lumen. The first lumen and the guide wire being sized so that dye injections and/or pressure measurements can be made through the second fitting.
Fig. (9) Reported sensations across all trials on all nerves. The low frequency pulse train resulted in the most non-paresthesia sensations with minimal discomfort. Some totals are over 100% since some subjects reported more than one descriptor per trial. Sensations that were reported fewer than three times are not included in this figure. ...
Objective: To evaluate the outcome of treatment of antebrachial and crural septic non-union fractures in dogs using circular external skeletal fixation (CESF), and to document the type and frequency of complications associated with this technique. Methods: The medical records of all dogs with infected antebrachial and crural non-union fractures treated using the methods of Ilizarov at the Department of Animal Pathology of the University of Turin between 2006 and 2011 were retrospectively reviewed. ...
Arthrex Inc. seeks creative, resourceful and technically knowledgeable professionals to join our team The Medical Education team is looking for an M.D., Physician Assistant or Nurse Practitioner for their open Clinical Specialist position. Experience in orthopaedics, arthroscopy and trauma preferred. This is not a sales role, but a corporate medical education position teaching our surgeons and Technology Consultants on our products in our surgical skills lab. This is a unique opportunity to utilize your surgical experience in the industry. Never take a call or wear a pager again! We pay 100% of medical and dental premiums for employees and 50% for dependent coverage; free lunch; gym membership; matching 401k; etc. We will assist you with relocation. As one of the 2015 and 2016 FORTUNE
For any non-gliding animal, the distance of a leap depends on the direction and magnitude of its velocity vector at take-off. For a standing-start leap, the velocity achieved by the animal is limited by the amount of energy imparted to the body before take-off. This, in turn, is limited by the ability of the muscles to perform mechanical work on the body.. Specialized leapers demonstrate a number of adaptations that increase both the force applied to the substrate (e.g. the power-amplifying mechanisms of galagos [1], froghoppers [2], fleas [3] and locusts [4]), and the distance over which force is applied (e.g. the elongated distal leg segments of galagos [5] and frogs [6], the manipulation of the force-length characteristics of anuran leg muscle [7]). Adaptations such as these are synonymous with maximizing mechanical work and improving leap performance.. Behavioural strategies during the push-off and landing phases can significantly increase the mechanical work performed and lengthen the leap ...
The HoxD cluster is critical for vertebrate limb development. Enhancers located in both the telomeric and centromeric gene deserts flanking the cluster regulate the transcription of HoxD genes. In rare patients, duplications, balanced translocations or inversions misregulating HOXD genes are responsible for mesomelic dysplasia of the upper and lower limbs. By aCGH, whole-genome mate-pair sequencing, long-range PCR and fiber fluorescent in situ hybridization, we studied patients from two families displaying mesomelic dysplasia limited to the upper limbs. We identified microduplications including the HOXD cluster and showed that microduplications were in an inverted orientation and inserted between the HOXD cluster and the telomeric enhancers. Our results highlight the existence of an autosomal dominant condition consisting of isolated ulnar dysplasia caused by microduplications inserted between the HOXD cluster and the telomeric enhancers. The duplications likely disconnect the HOXD9 to HOXD11 genes from
The lab of Craig Crews, Ph.D., Department of Molecular, Cellular and Developmental Biology at Yale is inviting applications for multiple postdoctoral positions. With an emphasis on regenerative medicine, the lab investigates the inductive role of the wound epidermis on cellular dedifferentiation during amphibian limb regeneration.. Our research has recently revealed key genes that are specifically expressed in the regenerating epidermis of the Mexican salamander (aka, the Axolotl). Several of these genes encode secreted or membrane-bound proteins that may play a role in inducing/maintaining the dedifferentiated state of the underlying mesenchyme during regeneration and thus may serve as a natural analogy for the induction of iPS cells. We are exploring the roles of these proteins using both cell culture-based assays and in vivo/transgenic expression analyses. These projects are partly supported by the NIH and the Ellison Medical Foundation.. A successful candidate should be self-motivated with a ...
We have recently identified Dlkl/FA1 as a novel surface marker for chondroprogenitor cells during embryonic chondrogenesis and demonstrated the Akt pathway-dependent inhibition of insulin induced in vitro chondrogenesis by Dlk1/FA1 [21, 22]. However, the mechanisms by which Dlk1 is regulated and its interaction with other signaling pathways during chondrogenic differentiation are not well known. In this study, we have identified Dlk1 as a novel downstream target of the TGF-β signaling pathway that mediates its function by promoting early chondrogenesis. Additionally, we observed altered Smad2 phosphorylation with Dlk1/FA1 overexpression suggesting that Dlk1/FA1 inhibits activation of TGF-β signaling pathway.. We used mouse embryonic limb bud culture as an in vitro system that spontaneously differentiates in culture without any exogenous chondrogenic inducers and recapitulates the sequential stages of chondrogenesis from condensing mesenchyme to matrix mineralization [24, 39, 40]. The ...
Front legs do the split and go rigid - posted in Health and Genetics: 13 year old dog.. No previous health issures. In fact every morning hes out moving sheep around helping train the young dogs. The first time this happened was about 2 months ago. He stood up to look out the back door window and some how or other ended up on the floor. He was on his chest with his front legs straight out to the sides. Imagine doing a split. The odd thing was his lower legs was up off the floor. Alm...
Rostrum distinctly projecting anteroventrally in lateral view, but rounded in dorsal view; prodorsal ridges absent; interlamellar and exobothridial setae vestigial; sensilli with densely barbed clavate head and moderately long, narrow stalk; notogastral setae thin, smooth; setae much shorter than other notogastral setae. Surface of body and leg segments with thick cerotegument being very finely punctate on dorsal and ventral plates and having rather large granules on venter of pedotectum, on lateral part of prodorsum, and around leg acetabula. Rostrum rounded in dorsal view, but conspicuously projecting anteroventrally in lateral view ...
Question - I had a fracture at leg joint. I have severe pain. Kindly suggest. Ask a Doctor about diagnosis, treatment and medication for Bone fracture, Ask an Orthopaedic Surgeon
The stomach is distended and filled with granular food material. On the lateral projections, the pylorus is dorsally displaced and the fundus is positioned ventrally. On the v/d projection, the fundus is on the right of midline. The distal extremity of the spleen is dorsally displaced, and the proximal extremity is ventrally displaced on the lateral projections. It is not visible in its normal position on the v/d projection.The small intestine is caudally displaced and gas filled. The portion of the thorax included is normal ...