scholarly journals The Influence of Ultraviolet Illumination on the Passive Behavior of Zinc

2000 ◽  
Vol 147 (4) ◽  
pp. 1401 ◽  
Author(s):  
Amy L. Rudd ◽  
Carmel B. Breslin
Keyword(s):  
Passive Behavior ◽  
Ultraviolet Illumination

SEM and fluorescence imaging of callose deposition in root hair tips and suspension cultures of Streptanthus tortuosus

1990 ◽  
Vol 48 (3) ◽  
pp. 698-699
Author(s):  
K.S. Walters ◽  
R.D. Sjolund ◽  
K.C. Moore
Keyword(s):  
Cell Wall ◽  
Root Hair ◽  
Cultured Cells ◽  
Root Hairs ◽  
Callus Cultures ◽  
Callose Deposition ◽  
Culture Cells ◽  
Wall Structures ◽  
Ultraviolet Illumination ◽  
Callose Formation

Callose, B-1,3-glucan, a component of cell walls, is associated with phloem sieve plates, plasmodesmata, and other cell wall structures that are formed in response to wounding or infection. Callose reacts with aniline blue to form a fluorescent complex that can be recognized in the light microscope with ultraviolet illumination. We have identified callose in cell wall protuberances that are formed spontaneously in suspension-cultured cells of S. tortuosus and in the tips of root hairs formed in sterile callus cultures of S. tortuosus. Callose deposits in root hairs are restricted to root hair tips which appear to be damaged or deformed, while normal root hair tips lack callose deposits. The callose deposits found in suspension culture cells are restricted to regions where unusual outgrowths or protuberances are formed on the cell surfaces, specifically regions that are the sites of new cell wall formation.Callose formation has been shown to be regulated by intracellular calcium levels.

TOKSISITAS AKUT INFUSA KULIT ARI KACANG TANAH (Arachis hypogea L.) PADA MENCIT BALB/ C

2018 ◽  
Vol 15 (2) ◽  
pp. 62
Author(s):  
Risha Fillah Fithria ◽  
Ririn Lispita Wulandari ◽  
Devi Nisa Hidayati ◽  
Lilis Rejeki
Keyword(s):  
Single Dose ◽  
Color Change ◽  
Negative Control ◽  
Control Group ◽  
Hair Color ◽  
Peanut Shell ◽  
Control Group Design ◽  
Safety Standards ◽  
Arachis Hypogea ◽  
Passive Behavior

ABSTRACTPeanut shell (PS) infusion has been shown to be antithrombocytopenia, but there has been no research on safety standards. This study aims to identify the symptoms of toxic effects, the potency of toxicity and histopathology of liver male Balb/C mice after a single dose of PS infusion. This research uses randomized matched posttest only control group design. Twenty five mice were divided into 5 orally dosage groups, ie, PS infusion with a dose of 0,026; 0.052; 0.104; 0.208 g/20gBW; and negative control of CMC Na 0.5%. The observation period is for 14 days. The results showed that single dose of PS infusion had a pseudo LD50 value ie > 0.208g/20gBW which was practically non toxic. Symptoms to watch out for the BW infusion were passive behavior, bradycnea, hair color change, hair loss, and weight loss at doses of 3 and 4. It is unclear whether liver damage ie inflammation, necrosis, and albuminous degeneration caused by PS infusion or other causes.keywords: acute toxicity, infusion, peanut shell

scholarly journals Peripheral Modulators of the Central Fatigue Development and Their Relationship with Athletic Performance in Jumper Horses

Animals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 743
Author(s):  
Francesca Arfuso ◽  
Claudia Giannetto ◽  
Elisabetta Giudice ◽  
Francesco Fazio ◽  
Michele Panzera ◽  
...  
Keyword(s):  
Blood Lactate ◽  
Athletic Performance ◽  
Lactate Concentration ◽  
Indirect Evidence ◽  
Blood Lactate Concentration ◽  
Central Fatigue ◽  
Serotoninergic System ◽  
Stressful Situation ◽  
Passive Behavior ◽  
Fatigue Development

The current study aimed to investigate whether peripheral modulators of serotoninergic function and neurohumoral factors’ changes in athletic horses during an official jumping competition, and to evaluate their relationship with the physical performance of competing horses. From 7 Italian Saddle mares (6–9 years; mean body weight 440 ± 15 kg), performing the same standardized warm-up and jumping course during an official class, heart rate (HR) was monitored throughout the competition. Rectal temperature (RT) measurement, blood lactate and glucose concentration, serum tryptophan, leucine, valine, the tryptophan/branched-chain amino-acids ratio (Try/BCAAs), dopamine, prolactin, and non-esterified fatty acids (NEFAs) were assessed before the exercise event (T0), at the end of the competition stage (5 min ± 10 s following the cessation of the exercise, TPOST5), and 30 min after the end of competition (TPOST30). Highest HR values were recorded during the course and at the outbound (p < 0.0001); blood lactate concentration and RT increased after exercise with respect to the rest condition (p < 0.0001). Lower leucine and valine levels (p < 0.01), and higher tryptophan, Try/BCAAs ratio, and NEFAs values were found at TPOST5 and TPOST30 with respect to T0 (p < 0.0001). A higher prolactin concentration was found at TPOST5 and TPOST30 compared to T0 (p < 0.0001), whereas dopamine showed decreased values after exercise compared to rest (p < 0.0001). Statistically significant correlations among the peripheral indices of serotoninergic function, neurohumoral factors, and athletic performance parameters were found throughout the monitoring period. The findings provide indirect evidence that the serotoninergic system may be involved in fatigue during jumper exercise under a stressful situation, such as competition, in which, in addition to physical effort, athletic horses exhibit more passive behavior.

scholarly journals Effect of Mechanical Surface Treatments on the Surface State and Passive Behavior of 304L Stainless Steel

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 135
Author(s):  
Kathleen Jaffré ◽  
Benoît Ter-Ovanessian ◽  
Hiroshi Abe ◽  
Nicolas Mary ◽  
Bernard Normand ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Stainless Steel ◽  
Surface State ◽  
Electrochemical Impedance ◽  
Passive Films ◽  
Surface Finishing ◽  
Ultrafine Grain ◽  
304L Stainless Steel ◽  
Passive Behavior

The effect of dry grinding on 304L stainless steel’s passive behavior is compared to two other surface finishing (mechanical polishing down to 2400 with SiC emery paper and 1 µm with diamond paste, respectively). The characterization of the surface state was performed using scanning electron microscopy, transmission electron microscopy, 3D optical profilometer, and X-ray diffraction. Results indicate that each surface treatment leads to different surface states. The ground specimens present an ultrafine grain layer and a strong plastic deformation underneath the surface, while an ultrafine grain layer characterizes the subsurface of the polished specimens. Grinding induces high residual compressive stresses and high roughness compared to polishing. The characterization of the passive films was performed by electrochemical impedance spectroscopy and Mott–Schottky analysis. The study shows that the semiconductor properties and the thickness of the passive films are dependent on the surface state of the 304L stainless steel.

scholarly journals Photoreactions in Phycomyces

1961 ◽  
Vol 44 (6) ◽  
pp. 1177-1188 ◽  
Author(s):  
M. Delbrück ◽  
D. Varjú
Keyword(s):  
Ultraviolet Illumination ◽  
Constant Height ◽  
Two Systems

Equipment has been developed for ultraviolet illumination of sharply bounded test areas of the growing zone of sporangiophores of Phycomyces. The growing zone is opaque for this light and the tropic responses are negative. Periodic short narrow stimuli on alternating sides produce periodic tropic responses when applied at x &gt; 0.5 mm, but none for x &lt; 0.5 mm, where x is the distance below the sporangium. Sustained tropic stimuli, applied at constant x, produce tropic responses for any x &gt; 0.1 mm. The lag between stimulus and response is 3.3 min. for any x &gt; 0.5 mm. For smaller x the lag increases progressively. In all cases the tropic bend occurs at values of x &gt; 0.5 mm. Sustained tropic stimuli, applied at constant height relative to ground, produce relatively sharp tropic bends. The center of the bend is at all times close to the simultaneous position of the stimulated area. The boundaries of a light-adapted zone move less than 0.1 mm in 10 min. relative to the sporangium. It is concluded that the receiving and adapting structures do not move relative to the sporangium, and that the responding system does not move relative to ground. The two systems move relative to each other with the speed of growth. The responding system does not extend above x = 0.5 mm.

Preferences for Rape Reduction Strategies

1983 ◽  
Vol 7 (4) ◽  
pp. 301-312 ◽  
Author(s):  
Judith E. Krulewitz ◽  
Arnold S. Kahn
Keyword(s):  
Sex Role ◽  
Aggressive Treatment ◽  
Perceived Effectiveness ◽  
Sex Role Stereotypes ◽  
Passive Behavior ◽  
Reduction Strategies ◽  
Subject Variables ◽  
Action Strategies ◽  
Strategy Variables ◽  
Feminist Attitudes

The present study examined the effects of two subject variables (sex of subject and feminist attitudes) and two strategy variables (strategy aggressiveness and locus of responsibility for change) on the perceived effectiveness and desirability of four rape reduction strategies. Fifty-three females and 36 males served as subjects in a 24 factorial design. Although women rated all strategies as more effective and desirable than did men, attitude toward sex roles was a more pervasive determinants of patterns of perceived effectiveness and desirability than was subject sex. Generally, aggressive strategies were rated as more effective than nonaggressive strategies, and strategies placing the locus of responsibility for change on women were considered more effective than strategies requiring men and society to take action. Strategies that were consistent with sex-role stereotypes (women avoiding rape by passive behavior and men and society fighting rape by aggressive treatment of rapists) were seen as more effective than nonstereotypic strategies. Profeminists found the nonstereotypic strategies to be more desirable, however, and they also rated as relatively more desirable those strategies that placed responsibility for change on men and society. The results are discussed in terms of the importance of sex-role attitudes rather than subject sex differences in reducing rape.

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