The biodurability of various glass fibers, rockwool, and ceramic fibers was examined in rat lungs and compared with natural mineral fibers. Experiments were based on studies that have shown that the biodurability of fibers is one of the essential factors of the carcinogenic potency of these materials. Sized fractions of fibers were instilled intratracheally into Wistar rats. The evenness of dis...

A method is described for continuous, nondestructive analysis of xylem-borne mineral nutrients in intact transpiring plants. The method uses the xylem-feeding insect the meadow spittlebug (Philaenus spumarius L. [Homoptera: Cercopidae]). This insect will feed from a wide range of plant species and organs. Insect excreta can be collected at all times of the day and night, and its mineral ion con...

The goal of this research was to investigate the effect electrical conductivity (EC) levels nutrient solution on fresh weight, chlorophyll, and nitrate content hydroponic-system-grown lettuce. selected cultivars are most representative commercial varieties grown for European markets. Seven (‘Sintia,’ ‘Limeira,’ ‘Corentine,’ ‘Cencibel,’ ‘Kiber,’ ‘Attiraï,’ ‘Rouxaï’) three Lactuca sativa L. types...

Natural fiber composite materials have been widely applied for various purposes, one of which is reducing noise. Many efforts tried to reduce noise by using sound absorbing such as glasswool, rockwool, and gypsum absorbers, but because the high price bad impact on health, many studies conducted find that are practical, cheap, abundant availability in nature, natural an alternative commercial ma...

In hydroponic cultivation of vegetables with a solid substrate, mineral wool predominates. The pro-ecological policy and consumers’ expectations cause an increase in interest organic substrates, which, when properly used, are less harmful to the environment. aim this study was determine effect reusing lignite substrate on growth, yield quality cucumber fruit physical parameters substrate. green...

This paper tests whether being convicted of a crime a¤ects marriage market outcomes. While it is relatively well documented that crime hurts in terms of reduced future income, there has been little systematic analysis on the association between crime and marriage market outcomes. This paper exploits a detailed Danish register-based data set to …ll this gap in the literature. The main …ndings ar...

The mushroom (Agaricus bisporus) has a requirement for a "casing layer" that has specific physical, chemical and microbiological properties which stimulate and promote the initiation of primordia. Some of these primordia then may develop further into sporophores, involving differentiation of tissue. Wild and commercial strains of A. bisporus were cultured in axenic and nonaxenic microcosms, usi...

The mechanism of toxicity of selected asbestos substitute mineral fibres was examined and compared to that of asbestos. Alveolar macrophages and type II cells were isolated from Fischer 344 rats and after 20 h cultivation various concentration of fibres alone (amosite, wollastonite, rockwool or glass fibres) or in combination with cigarette smoke were added to cells and the cultivation continue...