Tissue volume changes in black spruce phloem

1973 ◽  
Vol 51 (9) ◽  
pp. 1649-1653 ◽  
Author(s):  
G. Brudermann ◽  
Z. Koran
Keyword(s):  
Cell Volume ◽  
Black Spruce ◽  
Volume Changes ◽  
Outer Bark ◽  
Tissue Volume ◽  
Inner Bark ◽  
Sieve Cells ◽  
Cell Dimensions ◽  
Sieve Cell

Cell dimensions and volume changes were studied in black spruce phloem by microscopic techniques.It was found that sieve cells measure 4 mm in length and 30 μm in diameter and constitute on the average 52.2% of the volume of the inner bark. However, sieve cell volume decreases gradually from 62.8% at the cambium to 38.7% in the outer dead phloem as a result of the collapse of these elements. In contrast, the volume of longitudinal parenchyma increases from 28.7% at the cambium to 43.7% in the outer dead bark.Sclereids possessing thick and multilayered walls make up on the average 3.4% of the inner bark. Sclereid volume increases from 2.8% at the cambium to 9.6% in the outer bark. On the average, rays constitute 6.4% of the inner bark, increasing from 5.7% at the cambium to 8% in the outer bark as a result of dilation.

Liver cell hydration and integrin signaling

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Michele Bonus ◽  
Dieter Häussinger ◽  
Holger Gohlke
Keyword(s):  
Cell Volume ◽  
Liver Cell ◽  
Cell Function ◽  
The Other ◽  
Signaling Cascades ◽  
Integrin Signaling ◽  
Volume Changes ◽  
The One ◽  
And Oxidative Stress

Abstract Liver cell hydration (cell volume) is dynamic and can change within minutes under the influence of hormones, nutrients, and oxidative stress. Such volume changes were identified as a novel and important modulator of cell function. It provides an early example for the interaction between a physical parameter (cell volume) on the one hand and metabolism, transport, and gene expression on the other. Such events involve mechanotransduction (osmosensing) which triggers signaling cascades towards liver function (osmosignaling). This article reviews our own work on this topic with emphasis on the role of β1 integrins as (osmo-)mechanosensors in the liver, but also on their role in bile acid signaling.

Cell volume changes affect gluconeogenesis in the perfused liver of the catfishClarias batrachus

2004 ◽  
Vol 29 (3) ◽  
pp. 337-347 ◽  
Author(s):  
Carina Goswami ◽  
Shritapa Datta ◽  
Kuheli Biswas ◽  
Nirmalendu Saha
Keyword(s):  
Cell Volume ◽  
Perfused Liver ◽  
Volume Changes

Germination of Polyporus tomentosus basidiospores on extracts from diseased and healthy trees

1971 ◽  
Vol 49 (5) ◽  
pp. 699-703 ◽  
Author(s):  
R. D. Whitney ◽  
W. P. Bohaychuk
Keyword(s):  
Spore Germination ◽  
Black Spruce ◽  
Root Bark ◽  
Inner Bark

High percentages of P. tomentosus spores germinated on media supplemented with bark extracts from roots of white and black spruce. Best germination was on extracts from the inner bark of black spruce. Spore germination was significantly higher on extracts from root bark of diseased trees than on those from healthy trees.

scholarly journals Molecular mechanisms of regulation of fast-inactivating voltage-dependent transient outward K+current in mouse heart by cell volume changes

2005 ◽  
Vol 568 (2) ◽  
pp. 423-443 ◽  
Author(s):  
Guan-Lei Wang ◽  
Ge-Xin Wang ◽  
Shintaro Yamamoto ◽  
Linda Ye ◽  
Heather Baxter ◽  
...  
Keyword(s):  
Cell Volume ◽  
Molecular Mechanisms ◽  
Mouse Heart ◽  
Volume Changes ◽  
Voltage Dependent ◽  
K Current

Water permeability of alveolar macrophages

1986 ◽  
Vol 251 (4) ◽  
pp. C524-C528 ◽  
Author(s):  
R. A. Garrick ◽  
T. G. Polefka ◽  
W. O. Cua ◽  
F. P. Chinard
Keyword(s):  
Cell Volume ◽  
Alveolar Macrophages ◽  
Permeability Coefficient ◽  
High Ratio ◽  
Volume Changes ◽  
Membrane Pores ◽  
Linear Relationships ◽  
Diffusional Permeability ◽  
Water Passage ◽  
Suspended Cells

The hydraulic conductivity coefficient (Lp) of alveolar macrophages, recovered by lavage from dog lungs, was determined by following volume changes induced by changes of nonpermeating solute concentrations of suspending fluid as a function of time at 20 degrees C. The volume changes were monitored as changes in absorbance of the suspended cells at 600 nm. Cell surface area was calculated from cell volume and diameter. Linear relationships between cell volume and solution osmolality changes were found over the range of 320-520 mosmol/kg; beyond these ranges the macrophages did not respond with swelling or shrinking. Lp and the filtration coefficient (Pf) were calculated from the total volume change over time. At 20 degrees C these were, respectively, 15.7 X 10(-10) cm X cmH2O-1 X s-1 and 217 X 10(-5) cm/s. Comparison of Pf and the diffusional permeability coefficient (Pd) for water of 70 X 10(-5) cm/s, yields a Pf-to-Pd ratio of 3.1. The hypothesis of water passage through aqueous membrane pores is compatible with these data. However, diffusion of water in the glycocalyx of the pericellular domain could be restricted. Pd would then be underestimated, and a falsely high ratio would be calculated. We have no evidence to support this possibility.

Sulphosahs of the plagionite group

1969 ◽  
Vol 37 (288) ◽  
pp. 442-446 ◽  
Author(s):  
J. L. Jambor
Keyword(s):  
Cell Volume ◽  
Cell Dimensions ◽  
Linear Correlations ◽  
Fourth Member

SummaryThree of the members of the plagionite group, fülöppite Pb3S8S15, plagionite Pb5Sb8S17, and semseyite Pb9Sb8S21, show linear correlations of cell volume and density versus PbS:Sb2S3 mol ratios. This relationship can be used better to define the nature of the fourth member of the group, heteromorphite, Pb7Sb8S19. The cell dimensions derived for heteromorphite are a 13·60, b 11·93, c 21·22 Å, β 90° 50′.

scholarly journals Fate of Antioxidative Compounds within Bark during Storage: A Case of Norway Spruce Logs

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4228
Author(s):  
Tuula Jyske ◽  
Hanna Brännström ◽  
Tytti Sarjala ◽  
Jarkko Hellström ◽  
Eelis Halmemies ◽  
...  
Keyword(s):  
Norway Spruce ◽  
Condensed Tannins ◽  
Antioxidative Activity ◽  
Value Added ◽  
Hot Water ◽  
Raw Material ◽  
Outer Bark ◽  
Production Chain ◽  
Inner Bark ◽  
Storage Treatment

Softwood bark is an important by-product of forest industry. Currently, bark is under-utilized and mainly directed for energy production, although it can be extracted with hot water to obtain compounds for value-added use. In Norway spruce (Picea abies [L.] Karst.) bark, condensed tannins and stilbene glycosides are among the compounds that comprise majority of the antioxidative extractives. For developing feasible production chain for softwood bark extractives, knowledge on raw material quality is critical. This study examined the fate of spruce bark tannins and stilbenes during storage treatment with two seasonal replications (i.e., during winter and summer). In the experiment, mature logs were harvested and stored outside. During six-month-storage periods, samples were periodically collected for chemical analysis from both inner and outer bark layers. Additionally, bark extractives were analyzed for antioxidative activities by FRAP, ORAC, and H2O2 scavenging assays. According to the results, stilbenes rapidly degraded during storage, whereas tannins were more stable: only 5–7% of the original stilbene amount and ca. 30–50% of the original amount of condensed tannins were found after 24-week-storage. Summer conditions led to the faster modification of bark chemistry than winter conditions. Changes in antioxidative activity were less pronounced than those of analyzed chemical compounds, indicating that the derivatives of the compounds contribute to the antioxidative activity. The results of the assays showed that, on average, ca. 27% of the original antioxidative capacity remained 24 weeks after the onset of the storage treatment, while a large variation (2–95% of the original capacity remaining) was found between assays, seasons, and bark layers. Inner bark preserved its activities longer than outer bark, and intact bark attached to timber is expected to maintain its activities longer than a debarked one. Thus, to ensure prolonged quality, no debarking before storage is suggested: outer bark protects the inner bark, and debarking enhances the degradation.

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