Cell ultrastructure in the pygmy shrew

1991 ◽  
Vol 112 (3) ◽  
pp. 1358-1361
Author(s):  
M. M. Kalashnikova ◽  
O. V. Smirnova
Keyword(s):  
Cell Ultrastructure ◽  
Pygmy Shrew

Effects of the pseudomonad phytotoxin coronatine on tomato leaf structure and ultrastructure

1995 ◽  
Vol 53 ◽  
pp. 862-863
Author(s):  
D.A. Palmer ◽  
C.L. Bender
Keyword(s):  
Pseudomonas Syringae ◽  
Membrane Integrity ◽  
Leaf Tissue ◽  
Cell Number ◽  
Cell Ultrastructure ◽  
Response To Treatment ◽  
Prominent Symptom ◽  
Chlorophylls A And B ◽  
Cell Dimensions ◽  
Structure And Ultrastructure

Coronatine is a non-host-specific phytotoxin produced by several members of the Pseudomonas syringae group of pathovars. The toxin acts as a virulence factor in P. syringae pv. tomato, allowing the organism to multiply to a higher population density and develop larger lesions than mutant strains unable to produce the toxin. The most prominent symptom observed in leaf tissue treated with coronatine is an intense spreading chlorosis; this has been attributed to a loss of chlorophylls a and b in tobacco. Coronatine's effects on membrane integrity and cell ultrastructure have not been previously investigated. The present study describes changes in tomato leaves in response to treatment with purified coronatine, infection by a coronatine-producing strain of P. syringae pv. tomato, and infection by a cor" mutant.In contrast to H2O-treated tissue, coronatine-treated tissue showed a diffuse chlorosis extending approximately 5 mm from the inoculation site. Leaf thickness, cell number, and cell dimensions were similar for both healthy and coronatine-treated, chlorotic tissue; however, the epidermal cell walls were consistently thicker in coronatine-treated leaves (Figs, la and lb).

Effect of INA bacteria on pulp cell ultrastructure of young loquat fruit

2011 ◽  
Vol 19 (2) ◽  
pp. 388-393
Author(s):  
Xian-Qian NIU ◽  
Guo-Hua ZHENG ◽  
Xiu-Xiang LIN ◽  
Mei-Sheng WANG ◽  
Shu-Min FANG
Keyword(s):  
Cell Ultrastructure ◽  
Pulp Cell ◽  
Ina Bacteria

scholarly journals Effect of nitrogen limitation on growth, biochemical composition, and cell ultrastructure of the microalga Picocystis salinarum

2021 ◽  
Author(s):  
Ronald Tarazona Delgado ◽  
Mayara dos Santos Guarieiro ◽  
Paulo Wagnner Antunes ◽  
Sérvio Túlio Cassini ◽  
Haydee Montoya Terreros ◽  
...  
Keyword(s):  
Biochemical Composition ◽  
Nitrogen Limitation ◽  
Cell Ultrastructure

P XI A.19 DNA and cell ultrastructure damage following cadmium administration on the skin

1997 ◽  
Vol 379 (1) ◽  
pp. S82-S83
Author(s):  
Caroline Fasanya ◽  
Lema Gilliard ◽  
Ray Menard ◽  
Akinyela Abdullah ◽  
Glenn Sponholtz ◽  
...  
Keyword(s):  
Cell Ultrastructure

scholarly journals Small-mammal assemblages inhabiting Sphagnum peat bogs in various regions of Poland

2012 ◽  
Vol 49 (2) ◽  
pp. 115-133
Author(s):  
Mateusz Ciechanowski ◽  
Jan Cichocki ◽  
Agnieszka Ważna ◽  
Barbara Piłacińska
Keyword(s):  
Small Mammal ◽  
Western Europe ◽  
Habitat Degradation ◽  
Myodes Glareolus ◽  
Peat Bogs ◽  
Trophic Conditions ◽  
Characteristic Features ◽  
Mammal Assemblages ◽  
Sorex Minutus ◽  
Pygmy Shrew

Abstract We studied species composition of assemblages of small mammals (rodents and shrews) inhabiting Polish 25 ombrotrophic mires and quaking bogs in several regions in order to reveal characteristic features of their quantitative structure and compare them between regions, internal zones of the bog habitats, and different levels of anthropogenic degradation. We reviewed also all published results of small-mammal trapping in such habitats. Mammals were captured in pitfalls, snap traps and live traps on 12 bogs of the Pomerania region, 4 bogs of the Orawa-Nowy Targ Basin (Kotlina Orawsko-Nowotarska), 3 bogs in the Świętokrzyskie Mts, and 6 bogs in Wielkopolska and the Lubusz Land. Additionally, we included materials collected from Barber traps (pitfalls) used during studies of epigeic invertebrates on 4 bogs. In total, 598 individuals of 12 species were collected. The number of pitfall captures per 100 trapnights was very low (7.0-7.8), suggesting low population density. Shrews predominated among mammals captured in pitfalls, and the assemblage structure appeared to be similar to impoverished forest fauna, slightly enriched with ubiquitous species from meadows and agroecosystems, with a very small percentage of typical wetland species (Neomys fodiens, Neomys anomalus, Microtus oeconomus). Rodents (mostly Myodes glareolus) predominated only in samples obtained by live and snap traps. Pygmy shrew Sorex minutus was the most numerous species at most sites, sometimes being the only small mammal in that habitat, especially in well-preserved, treeless parts of bogs, dominated by Sphagnum peatmoss. The dominance and high constancy of S. minutus appear to be a characteristic feature of small-mammal assemblages inhabiting ombrotrophic mires, at least in some regions of Central and Western Europe. Enrichment of the fauna with other species might be related to either improved trophic conditions (by contact with mineralized ground waters) or habitat degradation (by peat mining, drainage, and subsequent secondary succession).

Stereological Analysis of Leydig Cell Ultrastructure in Aged Humans*

1982 ◽  
Vol 55 (4) ◽  
pp. 634-641 ◽  
Author(s):  
HIROSHI MORI ◽  
NOBUHIKO HIROMOTO ◽  
MITSURU NAKAHARA ◽  
TSUNEO SHIRAISHI
Keyword(s):  
Leydig Cell ◽  
Cell Ultrastructure ◽  
Stereological Analysis

scholarly journals HEMOLYTIC SYSTEMS CONTAINING ANIONIC DETERGENTS

1946 ◽  
Vol 30 (1) ◽  
pp. 15-23 ◽  
Author(s):  
Eric Ponder
Keyword(s):  
Shape Change ◽  
Ph Dependence ◽  
Cell Ultrastructure ◽  
Effect Of Temperature ◽  
Red Cell ◽  
Inhibitory Effects ◽  
Serum Globulin ◽  
Hemolytic Action ◽  
Anionic Detergents ◽  
Protein Components

1. The members of the homologous series of anionic detergents, the sodium salts of the sulfated straight chain alcohols with the general formula CnH2n+1·SO3·Na, are hemolytic, the lytic activity being at a maximum when the compound contains 14 carbon atoms in the chain. In systems in which lysis is comparatively rapid, the hemolytic effect increases with increasing pH, but in systems containing quantities of lysin near the asymptotic concentrations the pH dependence of the activity is reversed. The effect of temperature is principally one on the velocity constant of the lytic reaction, with smaller effects on the position of the asymptotes of the time-dilution curves and on their shape. 2. The quantities of the detergents which produce disk-sphere transformations are approximately one-tenth of those required to produce complete hemolysis. In most cases, the shape change occurs when there are too few detergent molecules present to cover the red cell surfaces with a monolayer. 3. Plasma inhibits the hemolytic action of these detergents, and, in the quantities in which they occur in plasma, lecithin, serum globulin, cholesterol, and serum albumin, produce inhibitory effects which increase in that order in systems containing the C-14 sulfate. It can be inferred from these inhibitory effects that the anionic detergents can form compounds or complexes with lipid, lipoprotein, and protein components of the red cell ultrastructure.

scholarly journals Northern Range Extension of the Pygmy Shrew, Sorex hoyi, in the Yukon

2007 ◽  
Vol 121 (1) ◽  
pp. 94 ◽  
Author(s):  
Thomas S. Jung ◽  
Troy D. Pretzlaw ◽  
David W. Nagorsen
Keyword(s):  
Pitfall Trap ◽  
Range Extension ◽  
Pygmy Shrew ◽  
Blackstone River

A Pygmy Shrew, Sorex hoyi, was captured in a pitfall trap on the Blackstone River (65°04.6'N, 138°10.8'W) in central Yukon. This represents a northern range extension of about 110 km for S. hoyi in the Yukon.

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