Abstract: An electronic sampling head comprising a housing having a path for impinging radiation, a photoemissive element positioned across said path, photoelectron ejection means positioned in proximity to said photoemissive element, means for applying ultrashort sampling potential differences between said photoemissive element and said photoelectron ejection means for accelerating photoelectrons emitted by said photoemissive element in response to said incident radiation, and means for detecting said photoelectrons all resulting in the capability of detecting high-speed radiation phenomena with waveform fidelity.

Abstract: Asymmetrical, biodegradable insecticides having the formula: ##SPC1##Where R and R' are different and R is selected from the group consisting of --CH.sub.3, --CH.sub.3 O, --C.sub.2 H.sub.5 O, --C.sub.3 H.sub.7 O, and R' is selected from the group consisting of --3, and --3; and methods for providing and selectively controlling the biodegradability of DDT analogue insecticides.

Abstract: Method and apparatus for enabling the observation of a physical reaction occurring over many orders of magnitude in time including sensing information during a kinetic action and providing a corresponding output signal, integrating the output signal over periodic linear time segments, converting the information into digital form, and averaging the periodic information samples over exponentially increasing time intervals, each containing a plurality of said linear time segments. A digital signal averager with logarithmic time base in which analog signal information derived for instance during a physical reaction is converted into digital form in periodic samples of discrete linear time intervals, and including means for summing the samples over time intervals increasing by a fixed power, for instance two, and means for dividing the sum for each of the increasing time intervals by the number of linear time intervals in each of the increasing time intervals.

Abstract: In vitro net biosynthesis of chlorophyll and grana involving: irradiation of etiolated plant tissue; homogenization, in an environment including available oxygen, of the tissue in a buffer comprising biosynthetic cofactors including coenzyme A, glutathione, potassium, inorganic phosphate, methyl alcohol, magnesium, nicotinamide adenine dinucleotide and adenosine triphosphate; isolation from the homogenate of developing chloroplasts; irradiated incubation of the isolated chloroplasts in the presence of oxygen in another buffer of a constitution similar to that above-described and including .delta.-aminolevulinic acid. Synthesized products are isolated and quantified.

Abstract: Preparation of insecticidal, biodegradable compositions comprising mixtures of p-p'disubstituted diaryl trichloroethanes. Chloral, and appropriate substitutal benzenes are condensed, in a single step, at low temperature, e.g., -30.degree.C., using a condensing agent preferably consisting of a mixture of sulfuric acid and acetic acid.