The present invention is directed to a process for biological denitrification of effluents, containing up to 10 g/l of nitric nitrogen, which comprises using an active denitrification support made of selected high performance denitrifying bacteria fixed on a neutral support.

A method for improving the stability of amino acid-metal complexes or chelates and enhancing the uptake of these complexes into biological tissues. This method comprises forming the metal complexes with amino acids or hydrolyzed proteins and incorporating into them a buffer system which controls the pH of the complex and its surrounding media. This uptake is accomplished by the system of amino acid active transport into the blood stream from which the complex is then carried throughout the entir...

Biological treating systems include a treating tank for receiving wastewater to be treated, and a wastewater contacting unit mounted for reciprocating movement into and out of wastewater retained within the tank. Movement of the unit out of the wastewater exposes it to oxygen that is needed to maintain an aerobic environment for biolgical slimes, and movement of the unit into the wastewater permits these slimes to feed upon and metabolize pollutants therein. Preferably the systems include a plur...

An induction powered implanted monitor for epidurally measuring intracranial pressure and telemetering the pressure information to a remote readout. The monitor utilizes an L-C oscillator in which the C comprises a variable capacitance transducer, one electrode of which is a small stiff pressure responsive diaphragm. The oscillator is isolated from a transmitting tank circuit by a buffer circuit and all electric components in the implanted unit except an input and an output coil are shielded by ...

A body fluid drainage apparatus or shunt for implantation in the inner ear or elsewhere includes an essentially rigid elongated tube having one open end and a closed, flexible end with a valve, a generally rigid housing fixedly secured to and telescoping over the closed end of said elongated tube, a pair of angularly, oppositely extending arms fixedly secured to the assembly, and a pair of plastic films, with open sides, secured to the apparatus enclosing the valve. When the valve is a slit valv...

An improved means for biological treatment of sewage characterized in the provision of a single aerating device feeding waste water serially into first and second settling chambers. The aerating chamber has a horizontal sectional area which generally increases in size from a relatively smaller horizontal sectional area at the bottom of a relatively larger horizontal sectional area at the top. The aeration chamber is characterized in the introduction of relatively large air bubbles within the wat...

A biological surgical dressing, especially a surgical dressing for wounds composed of a combination of collagen fibers and carbamide, primarily in a ratio of 65 to 99 percent by weight collagen fibers and 1 to 35 percent by weight carbamide.

There is disclosed apparatus for automatically extracting compounds of clinical significance from a plurality of biological samples simultaneously by elution using a multi-channel system with common sources of wash reagents and eluent and common pre-programmed controls for all channels including means to purge wash and dry the channels between stages and means to inject essentially inert gas plugs as the interfaces between subsequent liquid phases. The extracted compounds can be mixed with reage...

The disclosure is directed to a device for coagulating biological tissue by applying heat to the same. The device has a cooling arrangement by means of which the heating leading end portion which contacts and coagulates the tissue, can be cooled upon completion of the coagulation so that it can be safely withdrawn without causing damage to non-coagulated tissue which it may contact during the withdrawal.

Container apparatus for processing biological specimens therein is described wherein a perforated receptacle member with abutment means is attached through a frangible hinge portion to a perforated cover member with detent means. When the cover member is rotated about the hinge to mate against the receptacle member, the detent means become interengageable with the abutment means to hold the cover and receptacle members in removable mating relationship.