[New mermithid genera and species parasitic in fleas]. / Novye rody i novyi vid mermitid, parazitiruiushchikh v blokhakh.

A new genus and a new species Imosmermis morosovi gen. sp. n. found in the flea Xenopsilla gerbilli minor Jordan are described. The genus Imosmermis differs from all known genera of Mermithidae by the absence of mouth and reduction of stihostome and the dorsal chord. Body is long and very thin. A new genus Aphanimermis comb. n. for the species Psyllomermis tshumacovae Rubzov is created. This genus is characterized with a stilet, with high developed lateral and ventral chord as well as with a tail which is absent in other genera infecting fleas.

[Effect of L-ascorbic and D-isoascorbic acids on induced formation of tyrosine aminotransferase in rat liver]. / Vliianie L-askorbinoovoi i D-izoaskorbinovoi kislot na indutsirovannoe obrazovanie tirozin-aminotransferazy v pecheni krys.

Administration of ascorbic acid at moderate doses/0.05-0.1 g per kg of body mass/was shown to induce tyrosine transaminase in liver tissue of intact rats. The enzyme induction depended on the state of adrenal glands and was inhibited by actinomycin D. As distinct from the native form of L-ascorbic acid moderate doses of D-isoascorbic acid did not induce the enzyme in rat liver tissue; these data suggest the relative biological inactivity of D-isoascorbic acid.

[New marine parasitic nematode, Abos bathycola, from priapulids and the position of the fam. Marimermithidae in the class Nematoda]. / Novaia morskaia paraziticheskaia nematoda Abos bathycola iz priapulid i polozhenie sem. Marimermithidae v klasse Nematoda.

A new genus and species of the marine parasitic nematode Abos bathycola gen. et sp. n. are described. The diagnosis of the new order Marimermithida with one family Marimermithidae Rubtzov et Platonova including 6 genera of marine parasitic nematodes is given. The new order resembles the order Mermithida in its extraintestinal feeding but differs from it in the following characters. The mouth, oesophagus, rectum and anus are reduced or absent. The mid-gut is transformed into trophosome, without lumen as a rule. If the lumen is present, no food is traced in the trophosome. The location of rudiments of oesophagus, chords, undeveloped trophosome, rudiments of rectum, if present, is consecutive. Stichosome is absent in contrast to the order Mermithida, in which it is well developed and is located in parallel with trophosome. Nematodes of the new genus are parasites of marine invertebrates unlike mermithids which are parasitic in land and freshwater arthrpods and sometimes in mollusks.

[Mermithids as biological control agents of blackflies]. / Mermitidy kak agenty biologicheskoi kor'by s moshkami.

About 80 species of mermithids parasitic in blackflies have been recorded from the Ethiopian and Holarctic regions. Species of three genera, Mesomermis, Gastromermis and Isomermis, are most common parasites of blackflies. Critical periods during the ontogenesis of all mermithids are associated with the penetration of infective larvae into the host and protective reactions of the later. Intraspecific hybridization of the parasites is recommended in order to increase the effectiveness of mermithids as agents of biological control of blackflies.

[Certain tasks in the studies of Mermithoidea for biological control of moths]. / Nekotorye zadachi issledovaniia mermitid dlia tselei biologicheskoi bor'by s moshkami

The method of "flooding" with mermitids, which was successfully used against mosquitoes, is unreal for biological control of black flies because of difficulties and unprofitableness of their laboratory maintenance and reproduction. A more probable way of solving the problem is the untroduction of effective forms of parasites. In perspective the cultivation of the adipose tissue of the host and biochemical overcoming of its protective reactions are necessary.

[Some problems in the study of mermitids for the purpose of the biological control of midges]. / Nekotorye zadachi issledovaniia mermitid dlia tselei biologicheskoi bor'by s moshkami

The method of "flooding" with mermitids, which was successfully used against mosquitoes, is unreal for biological control of black flies because of difficulties and unprofitableness of their laboratory maintenance and reproduction. A more probable way of solving the problem is the untroduction of effective forms of parasites. In perspective the cultivation of the adipose tissue of the host and biochemical overcoming of its protective reactions are necessary.