Liquid paraffin

About: Liquid paraffin is a research topic. Over the lifetime, 6185 publications have been published within this topic receiving 52956 citations.

The maintenance and preservation of keratinophilic fungi and related dermatophytes.

Abstract: Summary A total of 239 fungi belonging to nine genera and 23 species were maintained on agar slopes in a refrigerator at +8 ± 1 °C and in sterile distilled water, under liquid paraffin, dried on silica gel, in sterile soil at room temperature. A limited number has been stored by freeze-drying between 1985 and 1998. It is recommended that each isolate should be maintained by at least two of these methods. The choice of the method will depend to a large extent on the equipment and facilities available in the laboratory. It is reported that simple methods can be used for preservation of keratinophilic fungi and related dermatophytes. Zusammenfassung Es wurden 239 Pilzstamme (9 Genera, 23 Arten) auf Schragagar verimpft und in einem Kuhlschrank bei +8 °C unter sterilem Aquadest oder unter flussigem Paraffin oder aber auf Silicagel oder in sterilisiertem Boden bei Raumtemperatur aufbewahrt. Eine kleinere Zahl wurde gefriergetrocknet 13 Jahre lang aufbewahrt. Die Langzeitaufbewahrung von Pilzstammen sollte stets mit wenigstens zwei der vorgeschlagenen Methoden erfolgen.

Pharmaceutical compositions containing vitamin d and calcium, their preparation and therapeutic use

Abstract: Described herein is a pharmaceutical composition containing Vitamin D and calcium, comprising a binding agent chosen from among the group consisting of: propylene glycol, a polyethylene glycol presenting a molecular weight comprised between 300 and 1500, liquid paraffin or silicone oil, useful for the treatment of nutritional deficiency of calcium and Vitamin D in the elderly.

A novel in vitro bladder pelvic nerve afferent model in the rat

Abstract: Objective To develop an in vitro model to allow electrophysiological recordings from pelvic nerve afferents of the urinary bladder in the rat and to ascertain the stability and reproducibility of the model with time. Materials and methods Six male Wistar rats (body weight ≈100 g) were used in the study. The bladder (complete with accessory organs of prostate and seminal vesicles), urethra and penis, together with the attached pelvic nerve and L6/S1 nerve trunk, were removed intact and placed in a specially designed recording chamber containing oxygenated Krebs solution maintained at 30 °C. The bladder was catheterized urethrally and attached to a continuous-infusion pump and a pressure transducer. The L6/S1 nerve trunk was placed across a silicone-gel wall into a separate chamber containing liquid paraffin, in which multiunit recordings from pelvic nerve afferents originating from the bladder were made. The afferent nerve activities in response to repeated bladder distension with saline, at 0.04 mL/min for 8 min over 3 h, were compared using the paired t-test to assess the reproducibility of the model. Conduction velocity studies were also carried out to ascertain the proportion of C- and Aδ-fibres in the multiunit recordings. Results Repeated bladder distension with saline over 3 h produced consistent and reproducible afferent nerve responses, signifying that the afferent nerves recorded in this study neither sensitize nor desensitize over time. This is an essential prerequisite when using this model to study the effects of pharmacological manipulation of the bladder on its afferent nerve response. Conduction velocity studies showed that ≈30% of the afferent fibres recorded from were C-fibres with the remaining being Aδ-fibres. Conclusions An in vitro bladder pelvic nerve afferent model for the rat was developed successfully; it is stable and produces reproducible results with repeated bladder distension over at least 3 h.

Successive sequential extractive disintegration of coal in coal-derived solvents under ambient pressure

Abstract: Assam coal was successively extracted in anthracene oil, quinoline, and liquid paraffin. About 68% of the coal was rendered extractable through successive extraction in anthracene oil followed by quinoline and then finally in liquid paraffin. The combined total extractability of coal in all the solvent systems increased with an increase in the extraction time in successive extractions. Assam, Talcher, and Raniganj coals and Neyveli lignite gave more than 50% extraction yields through the successive extractive disintegration using an anthracene oil-quinoline-liquid paraffin solvent system. Possible explanations for successive extractive disintegration of coal in anthracene oil-quinoline-liquid paraffin solvents are given