In medicine, the BUN-to-creatinine ratio is the ratio of two serum laboratory values, the blood urea nitrogen (BUN) (mg/dL) and serum creatinine (mg/dL) (Cr).he normal range of urea nitrogen in blood or serum is 5 to 20 mg/dl, or 1.8 to 7.1 mmol urea per liter. The range is wide because of normal variations due to protein intake, endogenous protein catabolism, state of hydration, hepatic urea synthesis, and renal urea excretion.
The two most common types of asexual reproductive spores produced by molds are conidiospores and sporangiospores. Conidiospores are borne externally in chains on an aerial hypha called a conidiophore (see Fig.he two most common types of asexual reproductive spores produced by molds are conidiospores and sporangiospores. Conidiospores are borne externally in chains on an aerial hypha called a conidiophore (see Fig.
Fungal Reproduction. Spores are the primary reproductive path of fungi. They vary by class and species but usually they consist of several diploid cells, which are contained within a thick-walled particle, often reinforced with chitin. Fungi release millions of them in one spore âcloudâ and they are dispersed through the air, in water, and on animals. The spores are relatively tough and have a fair amount of resistance to a reasonable range of environmental factors, allowing them to be transported over long distances for a long time.