The action of enzyme preparations possessing hyaluronidase activity upon a number of substrates other than hyaluronic acid has been studied by Meyer and his colleagues (1940, 1941), by Madinaveitia & Stacey (1944), and by McClean & Hale (1941). The enzymes, for whose purity no claims were made, were prepared from testis, leech, pneumococcus, streptococcus, and Cl. welchii, and the substrates te...

Extracts of seeds of 21 bean cultlvars were screened for hemagglutinating specifity and for mitogenic activity. Four types could be distinguished in different beans, two of which are mitogens. Two lectin fractions (α and b) were isolated from each of the four bean types. Their MW were estimated by exclusion chromatography and component sugars by paper chromatography. Hemagglutinating activity, ...

The effects of Mn-containing solutions on the mechanical and electrical responses of myocardial tissue were studied on guinea pig ventricular strips. At a concentration of 10 mM, Mn abolished the twitch responses and caused the development of a contracture in stimulated preparations but not in resting or in Ca-depleted preparations. The duration of action potentials was shortened, and dV/dtma]l...

1. Nicotine, 20 mug/ml, briefly and partially blocked the longitudinal contractions of a chick vagus nerve-oesophagus preparation to nerve stimulation, but potentiated them in the presence of hyoscine, 10 mug/ml.2. Strychnine, 20 mug/ml, antagonized the longitudinal contractions of the chick oesophagus to nerve stimulation, though not to acetylcholine or 5-hydroxytryptamine. Hyoscine, 10 mug/ml...

In the present study, manganese (Mn), a neuromuscular blocker with pre and postsynaptic actions, was used to verify the neurotoxicity and myotoxicity induced by Crotalus durissus terrificus (Cdt) and Bothrops jararacussu (Bjssu) venoms in biventer cervicis preparations (BCp). Preparations pretreated with 0.66 and 1.6mM Mn did not affect Cdt venom-induced blockage nor change KCl-induced contract...

Since the start of community quarantines throughout Philippines, schools have been forced to close their doors for face-to-face classes. The Department Education, in its wish continue delivering instruction, resorted different distance learning delivery modalities ? one which is modular (printed). This study assessed public junior high school mathematics teachers? experiences preparing (printed...

We have applied multiple-site optical recording of transmembrane potential changes to recording of neuronal pathway/network activity from embryonic chick spinal cord slice preparations. Spinal cord preparations were dissected from 8-day-old chick embryos at Hamburger-Hamilton stage 33, and transverse slice preparations were prepared with the 13th cervical spinal nerve or with the 2nd or 5th lum...

Recently we reported that freeze-drying or centrifugation reactivated preparations of reduced diphosphopyridine nucleotide oxidase or reduced diphosphopyridine nucleotide-cytochrome c reductase which had been previously inactivated by extraction with isooctane (1). Homogenization of the enzyme preparations with small quantities of isooctane also inhibited these enzyme systems. The inhibited pre...

To evaluate the role of perinodal tissue in the genesis of atrioventricular (AV) nodal reentry, echo beats were induced by programmed stimulation in nine superfused rabbit atrial-atrioventricular nodal preparations. In these preparations, extracellular bipolar electrograms were recorded simultaneously from the crista terminalis, interatrial septum arid His bundle, along with microelectrode acti...