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Slow Growing (slow + growing)
Selected AbstractsAspiration biopsy cytology of extraabdominal desmoid tumor concurrently occurring in a patient with tumoral calcinosisDIAGNOSTIC CYTOPATHOLOGY, Issue 9 2008F.I.A.C., Husain Saleh M.D., M.B.A. Abstract Extraabdominal fibromatosis or desmoid tumor (DT) is a slow growing locally aggressive soft tissue tumor that can occur anywhere in the body. We report the aspiration biopsy cytology features of a case of DT of the right neck area in a 35-year-old man who had a long standing history of tumoral calcinosis. The aspirate was interpreted as "benign spindle cell lesion" and confirmed as DT on histologic examination of the resected mass. We discuss the possible differential diagnoses of other benign or malignant lesions on fine-needle aspiration (FNA) biopsy and especially discuss the aspiration cytology features of DT compared with those of tumoral calcinosis. We also discuss the value of immunohistochemical markers that help in differentiating DT from other entities. Diagn. Cytopathol. 2008;36:624,627. © 2008 Wiley-Liss, Inc. [source] High viral infection rates in Antarctic and Arctic bacterioplanktonENVIRONMENTAL MICROBIOLOGY, Issue 1 2007Christin Säwström Summary The frequency of visibly phage-infected bacterial cells (FVIB) and the average number of phages per cell [i.e. burst size (BS)] were determined in Antarctic and Arctic ultra-oligotrophic freshwater environments. Water samples were collected from two Antarctic freshwater lakes and cryoconite holes from a glacier in the Arctic. Data from this bipolar study show the highest FVIB (average 26.1%, range 5.1% to 66.7%) and the lowest BS (average 4, range 2,15) ever reported in the literature. The bacterial density is low in these ultra-oligotrophic freshwater environments but a large proportion of the bacteria are visibly infected. Our results suggest that a constant virioplankton population can be maintained in these extreme environments even though host density is low and often slow growing. [source] Contemporary climate change in the Sonoran Desert favors cold-adapted speciesGLOBAL CHANGE BIOLOGY, Issue 5 2010SARAH KIMBALL Abstract Impacts of long-term climate shifts on the dynamics of intact communities within species ranges are not well understood. Here, we show that warming and drying of the Southwestern United States over the last 25 years has corresponded to a shift in the species composition of Sonoran Desert winter annuals, paradoxically favoring species that germinate and grow best in cold temperatures. Winter rains have been arriving later in the season, during December rather than October, leading to the unexpected result that plants are germinating under colder temperatures, shifting community composition to favor slow growing, water-use efficient, cold-adapted species. Our results demonstrate how detailed ecophysiological knowledge of individual species, combined with long-term demographic data, can reveal complex and sometimes unexpected shifts in community composition in response to climate change. Further, these results highlight the potentially overwhelming impact of changes in phenology on the response of biota to a changing climate. [source] Odontogenic ghost cell carcinomaHEAD & NECK: JOURNAL FOR THE SCIENCES & SPECIALTIES OF THE HEAD AND NECK, Issue 4 2004David Goldenberg MD Abstract Background. Odontogenic ghost cell carcinoma (OGCC), a malignant counterpart of the calcifying odontogenic cyst (COC), is exceedingly rare. Previous descriptions of this tumor were based on identification of malignant histologic characteristics such as infiltration, cellular pleomorphism, numerous mitoses, and necrosis concurrent with classical benign COC or its solid benign variant, the odontogenic ghost cell tumor. Methods. We present a case of a young Asian man who underwent multiple local excisions of a recurring maxillary COC. After one such excision, a rapid onset of painful swelling ensued, and the patient was referred to our institution for definitive surgery. Results. The patient underwent a right subtotal maxillectomy. Intraoperatively, a 5-cm tumor was found to be extending into the right maxillary sinus and nasal cavity. The excised tumor was diagnosed as an OGCC. The tumor was excised with clear margins, and no adjunctive radiotherapy was given. The patient was free of residual or recurrent disease 18 months after surgery. Conclusions. On the basis of this case and prior cases found in the literature, OGCCs show a spectrum of growth from slow growing locally invasive tumors to highly aggressive, rapidly growing, infiltrative tumors. Wide local excision with histologically clean margins is the recommended mode of treatment. We recommend close long-term surveillance of recurrent or long-standing benign COCs and OGCC. © 2003 Wiley Periodicals, Inc. Head Neck26: 378,381, 2004 [source] Angiofibroma of the larynx: Report of a case with clinical and pathologic literature review,HEAD & NECK: JOURNAL FOR THE SCIENCES & SPECIALTIES OF THE HEAD AND NECK, Issue 8 2002Matthew H. Steele MD Abstract Background Angiofibromas are uncommon vascular tumors with a strong predilection for the nasopharynx of adolescent males. Although they are slow growing and histologically benign, they have the potential to cause significant morbidity with laryngeal involvement. Methods We describe the clinical characteristics, histopathologic findings, differential diagnosis, preoperative evaluation, and management of a case of laryngeal angiofibroma. Results The patient was initially seen with a 2½-year history of progressive dyspnea and dysphagia. Preoperative evaluation suggested a vascular mass involving the left supraglottic larynx. A partial laryngopharyngectomy was performed without complication. The patient is alive and disease free 3 years postoperatively. Final histopathologic diagnosis is consistent with angiofibroma. Conclusions Laryngeal angiofibroma is an extremely rare entity. Adequate preoperative imaging is necessary to confirm the vascularity of this lesion, because ill-planned biopsy may lead to significant blood loss. The role of preoperative embolization of other laryngeal vascular lesions has been well documented and may be useful in the management of laryngeal angiofibroma. © 2002 Wiley Periodicals, Inc. Head Neck 24: 805,809, 2002 [source] Dynamics of regional coexistence for more or less equal competitorsJOURNAL OF ANIMAL ECOLOGY, Issue 1 2003C. Patrick Doncaster Summary 1Competition between two species in a metapopulation involves each inhibiting the other's ability firstly to colonize an already occupied area and then to persist in it. Models for regional competition of this kind have 3-D dynamics, from which it has proved difficult to extract useful predictions except for special conditions. We introduce a 2-D general model for species that are equally vigorous at inhibiting the ability of others to remain in an occupied patch as to arrive there. The model covers the full spectrum of competitive interactions, from weak to strong and symmetrical to asymmetrical. Its Lotka,Volterra dynamics extend the general theory of competitive coexistence by generating clear predictions for community structure, amenable to cross-system comparisons and experimental manipulations. 2Previous 2-D models of interactions between dominant and fugitive species are special cases of the 2-D general model. Moderately asymmetrical competition has two outcomes distinctly different from dominant,fugitive interactions, at both the scale of metapopulation and population: (i) slow growing and weak competitors coexist with faster growing superior competitors, albeit at reduced densities; and (b) habitat removal always yields relative gains in abundance for species with higher growth capacity, but the gains are absolute only for species subjected to competitive impacts that exceed within-species impacts. Extinctions of slow growing and weak competitors provide the most sensitive indication of habitat degradation, and their losses also have the least effect on community structure. 3The 2-D general model further predicts that highly productive communities will tolerate differences between species in their capacity for population growth, whereas less productive communities will tolerate stronger competitive interactions between species. This prediction applies equally to a population of resource consumers as to a metapopulation of colonists. The model explicitly links local and regional population dynamics to r,K selection in community structure by predicting a prevalence of growth-orientated species in resource-poor habitats and competition-orientated species in resource-rich habitats. [source] A new austenitic alumina forming alloy: an aluminium-coated FeNi32Cr20MATERIALS AND CORROSION/WERKSTOFFE UND KORROSION, Issue 6 2008H. Hattendorf Abstract The FeCrAl alloys owe their low oxidation rate to the formation of a slow growing , -aluminium oxide scale. Therefore they are used, for example, as a substrate material in metal-supported automotive catalytic converters. Increasing exhaust gas temperatures mean that, in addition to the oxidation properties, high temperature mechanical properties should also be improved. Compared to the ferritic FeCrAl alloys, austenitic alloys possess the required high mechanical strength at higher temperatures. However for most commercially available materials the oxidation resistance is not sufficient due to a low aluminium content. High aluminium contents are avoided in austenitic alloys, since they cause severe workability problems, even at aluminium contents, which are below the necessary amount to get a pure alumina scale. The newly developed material Nicrofer 3220 PAl (coated FeNiCrAl) consists of an austenitic FeNi32Cr20 alloy coated with aluminium on both sides. It combines the outstanding oxidation resistance of an alumina forming FeCrAl alloy with the advantage of the high temperature strength of an austenitic alloy. Additionally the oxidation is even lower than the oxidation of the commercial grade Aluchrom YHf (FeCr20Al6),conventional homogenous FeCrAl. Aluminium coated FeNiCrAl can easily be formed into its final shape. Prior to service, an in situ heat treatment is recommended in order to optimize the properties. [source] Xanthomonas axonopodis pv. citri: factors affecting successful eradication of citrus cankerMOLECULAR PLANT PATHOLOGY, Issue 1 2004James H. Graham SUMMARY Taxonomic status:, Bacteria, Proteobacteria, gamma subdivision, Xanthomodales, Xanthomonas group, axonopodis DNA homology group, X. axonopodis pv. citri (Hasse) Vauterin et al. Microbiological properties:, Gram negative, slender, rod-shaped, aerobic, motile by a single polar flagellum, produces slow growing, non-mucoid colonies in culture, ecologically obligate plant parasite. Host range:, Causal agent of Asiatic citrus canker on most Citrus spp. and close relatives of Citrus in the family Rutaceae. Disease symptoms:, Distinctively raised, necrotic lesions on fruits, stems and leaves. Epidemiology:, Bacteria exude from lesions during wet weather and are disseminated by splash dispersal at short range, windblown rain at medium to long range and human assisted movement at all ranges. Crop loss:, Severe infections cause defoliation, blemished fruit, premature fruit drop, die-back of twigs and general debilitation of the tree. Distribution:, Citrus canker is not present in all subtropical to tropical regions of citriculture in the world, so considerable regulatory efforts are expended to prevent the introduction and spread of X. axonopodis pv. citri into areas in the Americas, Australia and elsewhere, with climates conducive to the disease. Importance:, Limited strategies exist for suppression of citrus canker on more susceptible cultivars. Blemished fruit are unmarketable and exposed fruit are restricted in market access. The economic impact of loss of markets is much greater than that from yield and quality reductions of the crop. Useful websites:,http://doacs.state.fl.us/canker , http://www.apsnet.org/education/lessonsplantpath/citruscanker/top.htm , http://www.apsnet.org/online/feature/citruscanker/ , http://www.plantmanagementnetwork.org/pub/php/review/citruscanker/ , http://www.abecitrus.com.br/fundecitrus.html , http://www.biotech.ufl.edu/PlantContainment/canker.htm , http://www.aphis.usda.gov/oa/ccanker/ . [source] Candida africana sp. nov., a new human pathogen or a variant of Candida albicans?MYCOSES, Issue 11-12 2001H.-J. Tietz Candida africana sp. nov.; Taxonomie; Systematik; Epidemiologie. Summary., Atypical Candida strains were isolated from patients in Madagascar, Angola and Germany. These isolates were slow growing and were unable to produce chlamydospores. They had atypical carbohydrate assimilation profiles. All strains were unable to assimilate the amino sugars N -acteylglucosamine and glucosamine as well as the disaccharide trehalose and the organic acid dl-lactate. They were germ-tube-positive in serum, but only some of these organisms produced pseudohyphae after a long incubation. As shown by Fourier transform infrared spectroscopy the atypical Candida isolates clustered as a monophyletic group different from C. albicans and C. dubliniensis. All strains belonged to C. albicans serotype B. Considering all data presented here, this group of Candida strains differs from any other known member of the genus Candida. Therefore, it is suggested to represent a new species within the genus Candida for which the name Candida africana is proposed. Zusammenfassung., Atypische Candida -Stämme wurden von Patienten aus Madagaskar, Angola und Deutschland isoliert. Die Keime wuchsen langsam und waren nicht im Stande, Chlamydosporen zu bilden. Allen Stämme fehlte die Eigenschaft, die Aminozucker N -Acetylglucosmin und Glucoasamin, das Disaccharid Trehalose und die organische Säure dl-Laktat zu assimilieren. Im Serum-Keimschlauchtest waren die Isolate positiv, wobei nur einige Stämme nach langer Inkubationszeit Pseudohyphen bilden konnten. Mit Hilfe der Fourier-Transform-Infrarot-Spektroskopie konnte gezeigt werden, daß die atypischen Candida -Stämme bezüglich C. albicans und C. dubliniensis differente Cluster bilden. Alle Stämme gehörten zum C. albicans Serotyp B. Unter Zugrundelegung der hier vorgestellten Ergebnisse unterscheidet sich diese Gruppe von Candida -Stämmen von allen anderen bekannten Vertetern der Gattung Candida. Aus diesem Grund wird vorgeschlagen, hierfür eine neue Spezies einzuführen, die den Namen Candida africana erhalten soll. [source] Response of a gorgonian (Paramuricea clavata) population to mortality events: recovery or loss?AQUATIC CONSERVATION: MARINE AND FRESHWATER ECOSYSTEMS, Issue 6 2008R. Cupido Abstract 1.During late summer 1999 and 2003 two mass mortality events affected the population of the slow growing, long-lived Mediterranean gorgonian Paramuricea clavata living in the Gulf of La Spezia (Italy). 2.The population was monitored for three years after the mortality events. Availability of pre-event data (1998) allowed comparison of population density and population size structure of the healthy population with those recorded in the three years following the mortality events. 3.In 1998, before the two mass mortality events, mean colony density was 33.3,±,3.7 colonies m,2 and had fallen to 6.7,±,1.9 colonies m,2 in 2004. 4.In the post-event period the population size structure changed and the modal class of colonies shifted from 16,21 cm to 6,15 cm height. 5.In 2004 mortality affected 75,±,6.4% of colonies. A significant, positive correlation between the extent of damage and colony size was found throughout the monitoring period. 6.In the three years following the two mortality events, a small increase in density of recruits and of older undamaged colonies was recorded suggesting that the population was slowly recovering. 7.The bathymetric distribution of P. clavata straddles the summer thermocline making this population particularly sensitive to temperature increases. The lack of deeper colonies (less exposed to warming) and the geographical isolation of this population is likely to prevent any substantial external larval supply. 8.An increased frequency of mass mortality events associated with ever increasingly high temperature events represent a considerable threat to the persistence of a P. clavata population in the Gulf of La Spezia. Copyright © 2007 John Wiley & Sons, Ltd. [source] Oncocytic lesions of the ophthalmic regionACTA OPHTHALMOLOGICA, Issue 2009S HEEGAARD Purpose To make a nationwide clinicopathologic study of oncocytic lesions in the ophthalmic region and to characterize their cytokeratin(CK) expression. Methods All histologically diagnosed oncocytic lesions in the ophthalmic region registered in Denmark over a 25-year period were collected and re-evaluated using a monoclonal antimitochondrial antibody (MU213-UC). Clinical data were registered. Immunohistochemical characterization was performed with a panel of anticytokeratin antibodies. Results A total of 34 oncocytic lesions were identified. The incidence that required surgical intervention in the Danish population could be approximated to 0.3 lesions per million capita per year. The age of the patients ranged from 45 to 89 years with a peak incidence in the 8th decade. Female gender was twice as common as male. Lesions were typically described as red-brown, cystic and slow growing. The antimitochondrial antibody MU213-UC produced a distinct and intense immunostaining. 26 of the lesions originated from the caruncle, three in the conjunctiva, two in the lacrimal sac, one at the semilunar plica, one on the eyelid margin and one peripunctal. Lesions were histologically classified as adenoma(oncocytoma) (26), hyperplasia (4) and metaplasia (4). Basal-type oncocytic cells reacted with antibodies against CK5/6, CK7, CK8, CK13, CK14, CK 17, CK18, CK19 and suprabasal cells with CK4, CK7, CK8, CK18 and CK19. Antibodies against CK1+10 and CK20 showed no reaction. Conclusion Oncocytic lesions of the ophthalmic region most frequently present as a caruncular oncocytoma. The cytokeratin profile is similar to the lacrimal - and accessory lacrimal gland duct elements and supports the theory that these lesions originate from lacrimal , and accessory lacrimal glands. [source] | |||||||||||||