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Biomedical subjects

K Molnár

Publications and source records attributed to K Molnár.

At least 73 records · Page 4Linked to original sources
PubMed1993

[The use of a nitinol (nickel-titanium) prosthesis in the management of malignant esophageal stenosis (preliminary report)].

The authors present the case of an 81-year-old male patient with cardia adenocarcinoma. The patient underwent a surgical resection. Due to local recurrence Gianturco prosthesis implantation was performed. After 5 months of unimpeded swallowing, the patient gradually lost his ability to swallow. This was caused by tumor overgrowth. The serious condition was managed by nitinol (Ultraflex) metallic prosthesis. This reticular, compressed stent is a nickel-titanium based alloy. After implantation, as a result of the body temperature it assumes its original shape. After the twofold prosthesis implantation the patient had no complaints. The authors found the case worthy of presentation because of the new method and the originality of the new design.

Aged↗
PubMed1993

Effect of decreased oxygen content on eels (Anguilla anguilla) infected by Anguillicola crassus (Nematoda: Dracunculoidea).

The survival chances of eels with Anguillicola crassus infection of varying intensity and with varying pathological changes were studied in an experimental system devoid of fresh oxygen supply. Eels most severely affected by anguillicolosis died first, while those with less expressed pathological lesions tolerated sublethal oxygen levels for a longer time. Findings were similar at 20-21 degrees C and at 27-28 degrees C; at 27-28 degrees C, however, the fish required a higher oxygen content to survive. The experiments demonstrate that Anguillicola infections substantially impair the eels' natural resistance and, under unfavourable environmental conditions, may lead to their death.

Air Sacs↗
PubMed1993

Recent achievements in the chemotherapy of myxosporean infections of fish.

Until quite recently, the therapy of fish diseases caused by myxosporeans has been an unsolved problem. Fumagillin is the only effective drug which can be successfully applied against several myxosporeoses in the form of prolonged feeding. It has been used with good results against sphaerosporosis of common carp, hoferellosis of goldfish, myxidiosis of eel, and proliferative kidney disease, whirling disease and ceratomyxosis of salmonids. Already a 4- to 6-day feeding of medicated diets containing 0.05-0.1% fumagillin was effective against the early blood stages of Sphaerospora, while toltrazuril failed to kill these parasites.

Animals↗
PubMed1993

The occurrence of Sphaerospora renicola K-stages in the choroidal rete mirabile of the common carp.

It is known from earlier studies that the so-called K-protozoa, the late presporogonic stages of Sphaerospora renicola, a parasite causing renal sphaerosporosis in common carp (Cyprinus carpio), accumulate in the swimbladder wall and give rise to the disease called myxosporean swimbladder inflammation. The present study indicates that in the case of intensive infection these parasites also occur in the rete mirabile of the choroid of the eye, causing haemorrhages and necrosis. The results suggest that the K-stages of S. renicola are located in the blood path just like the early presporogonic C-stages; however, as they get stuck in organs rich in capillaries, it is difficult to demonstrate them from the blood of the common carp.

Air Sacs↗
PubMed1992

Sphaerospora infection of American catfishes (Ictalurus punctatus and I. nebulosus) in Europe.

The occurrence in Europe of a Sphaerospora species described in North America is reported. Based upon its morphological characteristics, the parasite could be identified with the species S. hankai described from brown bullhead in Canada. This parasite was found to infect channel catfish (Ictalurus punctatus) cultured in farm ponds in Italy and brown bullhead (Ictalurus nebulosus) living in the supply channels of fish ponds in Hungary. The spores and sporogonic developmental stages were situated in the lumen of the renal tubules. In the authors' opinion, S. ictaluri described from channel catfish can be considered synonymous with S. hankai.

Animals↗
PubMed1992

Further monogeneans from Iranian freshwater fishes.

Thirteen Dactylogyrus, 1 Dogelius and 1 Tetraonchus species are first recorded on Iranian fishes. Of them, twelve Dactylogyrus species and Tetraonchus monenteron are identified with known species. Dogelius persicus sp. n. from Barbus sharpeyi, Barbus grypus and Carassobarbus luteus, as well as Dactylogyrus holciki from Chalcalburnus mossulensis and C. chalcoides are described as new species. Besides the first record of the above monogeneans, new host records are given to some known species.

Animals↗
PubMed1990

Occurrence of monogeneans on freshwater fishes in Iran: Dactylogyrus spp. on cultured Iranian fishes.

Thirteen Dactylogyrus spp. were found on cultured fishes in five Iranian fish farms. Besides typical Dactylogyrus vastator, specimens with small anchors were often found in goldfish, which were designated as D. vastator forma minor. Rutilus frisii kutum, a fish cultured only in Iran, was infected by two Dactylogyrus spp. during its short period of prerearing in Iranian fish farms. All Dactylogyrus found are new for the Iranian fauna.

Animals↗
PubMed1989

Ultrastructural observations on different developmental stages of Goussia sinensis (Chen, 1955), a parasite of the silver carp (Hypophthalmichthys molitrix Valenciennes, 1844).

The development of Goussia sinensis, a coccidium parasitizing the intestine of the silver carp (Hypophthalmichthys molitrix) was studied by electron microscopy. All stages developed in the epithelial cells, less frequently in the goblet cells, and were located within a parasitophorous vacuole. In some cases one cell was invaded by several merozoites. Eight to sixteen merozoites were formed within the meront by ectomerogony. The ultrastructural processes characteristic of gamogony were the same as those found for Goussia spp. parasitizing other species of fish. A hitherto unknown mechanism of oocyst wall formation was observed. The oocyst membrane developing within the zygote surrounded only part of the zygote material. Thus, a small part of the zygote material left the oocyst proper. It is suggested that this zygote residue and the necrotic host cell constitute the so-called "yellow bodies" which include the excreted oocyst. The oocyst wall was 40 to 60 nm thick. Oocyst sporulation took place within the fish. The sporocysts consisted of two hemispheres connected by sutures and had a 100 to 120 nm thick double wall. They were surrounded by sporocyst veils fixed to the oocyst wall by membranes.

Animals↗
PubMed1981

[Reaction time during ageing and in cerebral arteriosclerosis (author's transl)].

Authors studied 142 test persons aged between 54 and 86 years who were, expected for arteriosclerosis, free of any other disease. Severity of arteriosclerosis was assessed by funduscopy and the test persons divided into four groups: without of arteriosclerosis, mild and medium arteriosclerosis, respectively, and severe arteriosclerosis. The automatic measurement of reaction time was repeated in the majority after certain interval. Results of the two examinations have been compared. It has been found that delay of reaction time showed substantial relationship with the severity of cerebral arteriosclerosis and exceeded the relationship with age. Longitudinal examination gave evidence that during aging delay of reaction time showed an even speed, i.e. age does not influence speed of delay. Contrariwise regression was found to be essentially more rapid in the groups with severe arteriosclerosis with poor incipient values.

Age Factors↗