A comparitive colorimeter for use in the field which simultaneously compares the color densities of two liquid samples and designates the degree of difference. The apparatus includes two major subsystems, optical and electronic. The optical subsystem is designed to provide identical light beams through both the sample and standard solutions and to minimize the effect which imperfect sample tubes have on the output. The electronic subsystem includes a log conversion and differential amplifier cir...

Apparatus includes a mobile stand supporting a photographic assembly having a camera photographing through a light at pre-set and fixed apparatus-to-patient distance establishing a constant photographic environment, in minimal space. The photographic assembly includes a means to mount a 90 degree rotatable camera body about an axis perpendicular to the film plane whereby subjects can be photographed on either a horizontal or vertical format. An adaptor sleeve is mounted on a zoom lens and, in co...

A method and device for performing comparative assay of binding and bindable substances such as antibodies and antigens. The device includes a circulation conduit for continuously conveying a carrier fluid between a support zone therein and a detection zone therein. A competitive binding substance is fixed in the support zone and is capable of competitively binding a test substance and an analytical detection substance such that changes in concentration of the test substance in the carrier fluid...

The present invention relates to growing and testing microorganisms in a multitest format which utilizes a gel forming matrix for the rapid screening of clinical and environmental cultures. The present invention is suited for the characterization of commonly encountered microorganisms (e.g., E. coli, S. aureus, etc.), as well as commercially and industrially important organisms from various and diverse environments (e.g., the present invention is particularly suited for the growth and characteri...

A comparative conductivity detection system includes a sample channel assembly and a reference channel assembly. The sample channel assembly includes a sample-fluid channel, a drive electrode, and a detection electrode. The reference channel assembly includes a reference fluid channel, a drive electrode, and a detection electrode. The channels are formed as trenches in a planar substrate. Each electrode is capacitively coupled to its respective channel through a planar cover over the substrate. ...

A ruler device for eliciting judgements about the ratio of factors includes a first base member having first indicia indicating the ratio of factors, and a second base member slidably mounted to the first base member. The second base member moves longitudinally along the first base member, and has second indicia indicating an optical weighing of the factors. The second indicia is adjacent with the first indicia and alignable with respect thereto by relative movement of the first and second base ...

A method and system for quantifying the relative abundance of gene transcripts in a biological sample. One embodiment of the method generates high-throughput sequence-specific analysis of multiple RNAs or their corresponding cDNAs (gene transcript imaging analysis). Another embodiment of the method produces a gene transcript imaging analysis by the use of high-throughput CDNA sequence analysis. In addition, the gene transcript imaging can be used to detect or diagnose a particular biological sta...

Disclosed are new methods comprising the use of in situ hybridization to detect abnormal nucleic acid sequence copy numbers in one or more genomes wherein repetitive sequences that bind to multiple loci in a reference chromosome spread are either substantially removed and/or their hybridization signals suppressed. The invention termed Comparative Genomic Hybridization (CGH) provides for methods of determining the relative number of copies of nucleic acid sequences in one or more subject genomes ...

The present invention relates to growing and testing microorganisms in a multitest format which utilizes a gel forming matrix for the rapid screening of clinical and environmental cultures. The present invention is suited for the characterization of commonly encountered microorganisms (e.g., E. coli, S. aureus, etc.), as well as commercially and industrially important organisms from various and diverse environments (e.g., the present invention is particularly suited for the growth and characteri...

Disclosed are new methods comprising the use of in situ hybridization to detect abnormal nucleic acid sequence copy numbers in one or more genomes wherein repetitive sequences that bind to multiple loci in a reference chromosome spread are either substantially removed and/or their hybridization signals suppressed. The invention termed Comparative Genomic Hybridization (CGH) provides for methods of determining the relative number of copies of nucleic acid sequences in one or more subject genomes ...