Abstract: To eliminate welds when forming connections from coupling joints of membrane filter structures having two external housing plates between which a membrane filter assembly (3, 4) is positioned, one (2) of the housing plates (1, 2) is formed with a bored or milled, essentially circular recess at each one of the locations where fluid connection couplings (6-9) are to be placed, the fluid connection couplings being formed by a plug element which is clamped in sealing engagement against a sealing bottom wall surface (13) of the respective recess. To provide absolute tightness, even of molecular substances such as bacteria, tissue elements, yeasts and the like, a sealing ring, preferably an O ring (15) is placed in a groove (14) formed in the sealing wall surface (13).

Abstract: A latch is known for a laboratory apparatus, for locking a cover or door on its housing, having a hook 12 in one of the parts to be locked and a lock 1 in the other. The lock has a pivotable locking element 3 with a claw-shaped opening 9 which engages the hook 12 against the pressure of a spring and is releasable from engagement with the hook by an actuating element 7. In order to provide a latch of this kind with means to meet strict safety requirements and ensure secure locking during operation of the apparatus, an additional closing element 4, opening element 5, and securing element 6, which engage one another, are disposed between the locking element 3 and the actuating element 7.

Abstract: A process for increasing the carbohydrate accumulation in plants by application of compounds of the class of phenoxyphenoxy-, pyridyloxy-, benzoxazolyloxy-, benzothiazolyloxy-, quinolinyloxy-, quinazolinyloxy-phenoxypropionic acid derivatives or cyclohexanedione derivatives.

Abstract: Compounds of formula ##STR1## wherein R is halogen, CF.sub.3, NO.sub.2, CN, (C.sub.1 -C.sub.4)alkyl or (C.sub.1 -C.sub.4)-alkoxy, n is zero or 1, X is O, S, NH, or N-(C.sub.1 -C.sub.4)alkyl, Y is O or S, R.sup.1 is H or (C.sub.1 -C.sub.4)alkyl and Z is, among others, a cyanalkyl, (subst.) carbalkoxyalkyl, (subst.) carbalkoxyphenyl, sulfoxyalkyl or oxime group, are selective herbicides active especially against weed grasses.

Abstract: Compounds of the formula ##STR1## in which R represents hydroxyl, (C.sub.1 -C.sub.10)alkoxy, (C.sub.1 -C.sub.6)alkylthio, (C.sub.2 -C.sub.4)alkenyloxy, cyclohexyloxy, cyclopentyloxy, phenoxy or phenylthio both optionally substituted once or twice with halogen, benzyloxy, benzylthio or -O-cat in which "cat" stands for the cation of an inorganic or organic base, have a very good effect on wild oat, barnyard grass, bristle grass and rayegrass in a much lower concentration than known analogous compounds.

Abstract: Herbicidal agents containing as active ingredient a compound of the formula ##STR1## in which R represents halogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.2 -alkoxy or C.sub.1 -C.sub.2 -alkylthio, C.sub.1 -C.sub.2 -halogeno-alkyl, NO.sub.2 SO.sub.2 CH.sub.3, SO.sub.2 NH.sub.2, --COOCH.sub.3, CN, with the proviso that R.sub.2 cannot be alkoxy when (R).sub.n is alkyl, R.sub.1 and R.sub.3 represent C.sub.1 -C.sub.6 -alkyl, R.sub.2 represents C.sub.1 -C.sub.6 -alkyl, CH.sub.2 Cl or C.sub.1 -C.sub.6 -alkoxy, X is oxygen or sulfur and n is an integer of from 1 to 3 are especially useful for combatting annual weed grasses in dicotyledonous and even monocotyledonous crop plants.

Abstract: Phenoxyphenoxy-propionic acid derivatives of the formula ##STR1## exhibit an outstanding herbicidal activity against a wide variety of weed grasses and are well tolerated by dicotyledonous crop plants and various cereals.

Abstract: Compounds of the formula ##STR1## in which (R).sub.n is hydrogen, halogen, CF.sub.3, NO.sub.2, CN, alkyl, alkoxy or alkylthio,A is O, S, NH, or N-alkyl,R.sub.1 is hydrogen or alkyl andZ is a carboxylic acid, carboxylic ester, thiol ester, carbonamide, carbohydrazide, thioamide, nitrile, hydroxymethyl, acyloxymethyl, carbamoylmethyl, or sulfonyloxymethyl group,Are valuable herbicides for the selective control of weed grasses. The novel compounds are prepared by known methods, for example by reacting halo-benzthiazoles, -benzoxazoles or -benzimidazoles with unilaterally etherified hydroquinones.