The steady-state isometric force following active muscle shortening is smaller than the corresponding force obtained for purely isometric contractions. This so-called residual force depression has been observed consistently for more than half a century, however its mechanism remains a matter of scientific debate. [Maréchal, G., Plaghki, L., 1979. The deficit of the isometric tetanic tension red...

Background: Chronic Periodontitis is the most frequently occurring form of periodontal diseases. Progression of the chronic periodontitis might lead to both esthetic and functional impairment. Early diagnosis and treatment will prevent its progression. Salivary biomarkers such as arginase activity estimation will be of help for assessing the present periodontal status. In the present study, sal...

The ability of oximes to reactivate organophosphorus nerve agent-inhibited acetylcholinesterase (AChE) activity is critical for protection against chemical warfare nerve agent intoxication. We have studied the capability of the tertiary oximes monoisonitrosoacetone (MINA) and diacetylmonoxime (DAM), in comparison with the quaternary oximes 2-PAM, HLo7 and MMB-4 to reactivate AChE inhibited by s...

Isoji Sasagawa, MD, Department of Urology, Yamagata University, School of Medicine, 2-2-2 Iidanishi, Yamagata-shi, Yamagata 990-23 (Japan) pressure, bicarbonate and base excess. Sodium and potassium were determined by flame photometry. Chloride was measured by amperometric titration. BUN was determined by a diacetylmonoxime-thiosemicar-bizide reaction and creatinine was estimated with a modifie...

The current treatment regimen for organophosphorus nerve agent intoxication depends on the ability of oximes to rapidly reactivate nerve agent-inhibited acetylcholinesterase (AChE) activity. We have studied the capability of the tertiary oximes monoisonitrosoacetone (MINA) and diacetylmonoxime (DAM), in comparison with the quaternary oximes 2-PAM, HLö7 and MMB-4, to reactivate AChE inhibited by...

Kinesin and myosin have been proposed to transport intracellular organelles and vesicles to the cell periphery in several cell systems. However, there has been little direct observation of the role of these motor proteins in the delivery of vesicles during regulated exocytosis in intact cells. Using a confocal microscope, we triggered local bursts of Ca2+-regulated exocytosis by wounding the ce...

We have investigated the effects of the calcium-sensitizing inotropic agent EMD 57033 on Ca(2+) handling in intact and skinned rat ventricular myocytes. Intracellular Ca(2+) was monitored using fura 2. Myocytes were saponin-skinned, allowing study of sarcoplasmic reticulum (SR) function. In intact myocytes EMD 57033 (1-10 micromol/l) produced a concentration-dependent decrease in the amplitude ...

There is wide speculation that ATP-sensitive K+(KATP) channels serve a protective function in the mammalian brain, being activated during periods of energy failure. The aim of the present study was to determine if KATP channels also have a protective role in the anoxia-tolerant turtle brain. After ouabain administration, rates of change in extracellular K+ were measured in the telencephalon of ...

In cardiac and skeletal muscle, eugenol (μM range) blocks excitation-contraction coupling. In skeletal muscle, however, larger doses of eugenol (mM range) induce calcium release from the sarcoplasmic reticulum. The effects of eugenol are therefore dependent on its concentration. In this study, we evaluated the effects of eugenol on the contractility of isolated, quiescent atrial trabeculae from...