Colony Growth Pattern inElectra pilosa(Linnaeus) and Comparable Encrusting Cheilostome Bryozoans

1987 ◽  
Vol 68 (1) ◽  
pp. 17-34 ◽  
Author(s):  
Lars Silén
Keyword(s):  
Growth Pattern ◽  
Colony Growth ◽  
Cheilostome Bryozoans

scholarly journals Cytogenetic studies and in vitro colony growth in patients with mastocytosis

Blood ◽  
1987 ◽  
Vol 70 (6) ◽  
pp. 1928-1932 ◽  
Author(s):  
B Swolin ◽  
S Rodjer ◽  
G Roupe
Keyword(s):  
Bone Marrow ◽  
Growth Pattern ◽  
Bone Marrow Cells ◽  
Systemic Mastocytosis ◽  
Colony Growth ◽  
Chromosome Abnormalities ◽  
Control Group ◽  
Normal Peripheral Blood ◽  
Abnormal Growth

Abstract Cytogenetic analysis of bone marrow cells and in vitro growth for bone marrow granulocytic-macrophage stem cells have been performed in 13 patients with mastocytosis, six with systemic mastocytosis, and seven with urticaria pigmentosa. Clones with chromosome abnormalities were found in five patients. The number of clusters and/or colonies after seven days in culture was increased in seven patients, compared with the growth in a control group. Three patients with chromosome abnormalities showed an abnormal growth pattern, yet exhibited normal peripheral blood values. Two patients with systemic mastocytosis had clones with chromosome abnormalities and some abnormal hematological values. The proportion of patients with chromosome abnormalities and an abnormal growth pattern was higher among these patients with mastocytosis than in healthy control subjects. These results may be of interest when discussing the origin of mast cell disorders and indicate an association with the myeloproliferative disorders.

scholarly journals Cytogenetic studies and in vitro colony growth in patients with mastocytosis

Blood ◽  
1987 ◽  
Vol 70 (6) ◽  
pp. 1928-1932
Author(s):  
B Swolin ◽  
S Rodjer ◽  
G Roupe
Keyword(s):  
Bone Marrow ◽  
Growth Pattern ◽  
Bone Marrow Cells ◽  
Systemic Mastocytosis ◽  
Colony Growth ◽  
Chromosome Abnormalities ◽  
Control Group ◽  
Normal Peripheral Blood ◽  
Abnormal Growth

Cytogenetic analysis of bone marrow cells and in vitro growth for bone marrow granulocytic-macrophage stem cells have been performed in 13 patients with mastocytosis, six with systemic mastocytosis, and seven with urticaria pigmentosa. Clones with chromosome abnormalities were found in five patients. The number of clusters and/or colonies after seven days in culture was increased in seven patients, compared with the growth in a control group. Three patients with chromosome abnormalities showed an abnormal growth pattern, yet exhibited normal peripheral blood values. Two patients with systemic mastocytosis had clones with chromosome abnormalities and some abnormal hematological values. The proportion of patients with chromosome abnormalities and an abnormal growth pattern was higher among these patients with mastocytosis than in healthy control subjects. These results may be of interest when discussing the origin of mast cell disorders and indicate an association with the myeloproliferative disorders.

scholarly journals Bryozoan internal moulds from the La Meseta Formation (Eocene) of Seymour Island, Antarctic Peninsula

2015 ◽  
Vol 36 (1) ◽  
pp. 25-49
Author(s):  
Urszula Hara
Keyword(s):  
Colony Growth ◽  
Taxonomic Composition ◽  
Climatic Conditions ◽  
Growth Patterns ◽  
The Family ◽  
La Meseta Formation ◽  
Lowermost Part ◽  
First Time ◽  
The Relationship ◽  
Cheilostome Bryozoans

AbstractThe loose, small zooecia of the cheilostome bryozoans have been discovered in the lowermost part of the LaMeseta Formation on Seymour (Marambio) Island. They systemati− cally include the representatives of Beanidae Canu et Bassler, Catenicellidae Busk, Savi− gnyellidae Levinsen, and Calwelliidae MacGillivray. The bryozoan assemblage is comprised of separate, small−sized internal moulds dominated by distinct, boat−shaped zooecia belonging to Beania, scarce, unizooidal internodes tentatively included into a ditaxiporine catenicellid ?Vasignyella, and representative of the family Savignyellidae. A few branched segments composed of multiserial zooecia arranged back to back were tentatively incorporated into ?Malakosaria. Beania, marks the oldest fossil record, whereas representatives of Savignyelli− dae along with ditaxiporine catenicellid and ?Malakosaria are for the first time reported from Antarctica. The relationship between the taxonomic composition, colony growth−patterns rep− resented by membraniporiform/petraliform, catenicelliform and cellariform, along with asso− ciated biota and sedimentary structures of the LaMeseta Formation implies nearshore environ− ment, with considerable wave action, and warm climatic conditions.

scholarly journals Erect bifoliate species of Microporella (Bryozoa, Cheilostomata), fossil and modern

2020 ◽  
Author(s):  
Emanuela Di Martino ◽  
Paul D. Taylor ◽  
Dennis P. Gordon
Keyword(s):  
Molecular Phylogeny ◽  
Growth Form ◽  
Colony Growth ◽  
Early Miocene ◽  
Nominal Species ◽  
Number Of Species ◽  
Recent Species ◽  
Cheilostome Bryozoans

Microporella Hincks, 1877 is one of the most diverse genera of cheilostome bryozoans, containing more than 150 named species. Distributed globally since the early Miocene, the majority of species of Microporella have sheet-like colonies encrusting hard and / or ephemeral substrates, while a limited number of species have erect bifoliate colonies starting from an encrusting base. Herein, the four nominal species of erect bifoliate Microporella (M. bifoliata, M. hastigera, M. hyadesi and M. ordo) are revised, and one new Pliocene (M. tanyae sp. nov.) and three new Recent species (M. ordoides sp. nov., M. lingulata sp. nov. and M. modesta sp. nov.) are formally described. Furthermore, the lectotype and paralectotypes were designated for M. bifoliata and M. hastigera. An additional Recent species, Microporella sp. 1, is also described and illustrated but left in open nomenclature owing to the absence of ovicells in the single available fragment. Although the molecular phylogeny of Microporella has yet to be resolved, the diversity of character states present among the erect bifoliate species described here suggests that this colony growth-form is not monophyletic but has evolved on multiple occasions.

Seasonality and colony-size effects on the life-history characteristics of Rhytidoponera metallica in temperate south-eastern Australia

2003 ◽  
Vol 51 (6) ◽  
pp. 551 ◽  
Author(s):  
Melissa L. Thomas
Keyword(s):  
Life History ◽  
Social Insects ◽  
Growth Pattern ◽  
Colony Size ◽  
Colony Growth ◽  
Growth Patterns ◽  
Logistic Growth ◽  
Slow Development ◽  
Eastern Australia ◽  
Laboratory Colonies

In social insects, colony growth is assumed to follow a logistic growth curve, with small, newly founded colonies experiencing exponential growth (ergonomic stage) that slows down with increasing colony size and approaches an asymptote when the colony produces sexuals (reproductive stage). Environmental factors may also influence colony growth, particularly in temperate climates where colder temperatures in winter slow development. However, growth patterns are rarely studied in detail in social insects. In this study, I investigated colony size and seasonality effects on life-history parameters of the ponerine ant Rhytidoponera metallica. I followed the growth of 10 laboratory colonies monthly over two years in conjunction with monthly excavations of 5 field colonies. Colony composition was highly seasonal in both laboratory and field colonies, with pupae and larvae produced only during the warmer months. Males, however, were present in colonies throughout most of the year. An expected logistic growth pattern was found in the majority (4 of 6) of laboratory colonies that had positive growth, one colony followed a Gompertz growth pattern and another a power curve. Two laboratory colonies decreased in size and two colonies didn't change in size. The slowing of growth observed with increasing colony size in the majority of laboratory colonies was related to a decrease in per capita brood production with increasing colony size. Colony size also related to the presence of males: field colonies containing males were significantly larger than field colonies where males were absent. By using a combination of laboratory and field colonies, I was able to obtain information on seasonality of brood and male production, in addition to important demographic data on mortality and natality rates that is difficult to obtain in social insects using only field excavations.

Analysis of 2D and 3D defects associated with precipitation of Cu in silicon

1991 ◽  
Vol 49 ◽  
pp. 870-871
Author(s):  
P.M. Rice ◽  
MJ. Kim ◽  
R.W. Carpenter
Keyword(s):  
Colony Growth ◽  
Dark Field ◽  
Dark Side ◽  
Silicide Phase ◽  
Strain Fields ◽  
Near Surface ◽  
Unknown Composition ◽  
Secondary Precipitates ◽  
20 Nm ◽  
2D And 3D

Extrinsic gettering of Cu on near-surface dislocations in Si has been the topic of recent investigation. It was shown that the Cu precipitated hetergeneously on dislocations as Cu silicide along with voids, and also with a secondary planar precipitate of unknown composition. Here we report the results of investigations of the sense of the strain fields about the large (~100 nm) silicide precipitates, and further analysis of the small (~10-20 nm) planar precipitates.Numerous dark field images were analyzed in accordance with Ashby and Brown's criteria for determining the sense of the strain fields about precipitates. While the situation is complicated by the presence of dislocations and secondary precipitates, micrographs like those shown in Fig. 1(a) and 1(b) tend to show anomalously wide strain fields with the dark side on the side of negative g, indicating the strain fields about the silicide precipitates are vacancy in nature. This is in conflict with information reported on the η'' phase (the Cu silicide phase presumed to precipitate within the bulk) whose interstitial strain field is considered responsible for the interstitial Si atoms which cause the bounding dislocation to expand during star colony growth.

Identification of a CVD Synthetic Diamond with a 'Tree Ring' Growth Pattern

2015 ◽  
Vol 34 (8) ◽  
pp. 702-710
Author(s):  
Yan Lan ◽  
Rong Liang ◽  
Taijin Lu ◽  
Yong Zhu ◽  
Tianyang Zhang ◽  
...  
Keyword(s):  
Tree Ring ◽  
Growth Pattern ◽  
Synthetic Diamond
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