The influence of some taxation indicators on the infection of oak with false oak tinder

Author(s):  
R.A. Churakov ◽  
B.P. Churakov ◽  
Yu.A. Churakova

Studies have been carried out on the influence of some taxation indicators (forest type, completeness, age, bonitet and composition of stands) on the infestation of oak growth with the causative agent of core rot - false oak tinder Phellinus robustus (Karst.) Bourd.et Galz. The influence of these indicators for the infection of oak with tinder has been established. Key words: taxation indicators, false oak tinder, infestation of trees.

1985 ◽  
Vol 65 (4) ◽  
pp. 805-810 ◽  
Author(s):  
H. W. CHRISTIE ◽  
D. N. GRAVELAND ◽  
C. J. PALMER

Subsoil moisture accumulation due to cultivation and particularly summerfallowing is considered as an important causative agent of dryland salinity. However, few studies have been conducted to quantify the magnitude of this accumulation. The amount of additional moisture that had accumulated under cultivated land as compared to adjacent native prairie was determined at two sites in Southern Alberta. In comparison to noncultivated sites, a total of 74.0 cm of additional moisture was found under the cultivated area of a Dark Brown Chernozem and 36.2 cm under a Brown Chernozem to a depth of 6 m. Only relatively insignificant changes in salt content were found. Key words: Dryland salinity, soil moisture, soluble salts


2021 ◽  
pp. 87-106
Author(s):  
A. Vashchenko ◽  
◽  
N. Matvienko ◽  
I. Kravchenko ◽  
A. Mruk ◽  
...  

Purpose: To analyze the specialized literature and summarize the information on the main parasitic diseases of whitefish. Findings: Whitefish are members of the Salmoniformes, which are currently represented by 3 subgroups (Salmonidae, Coregonidae, Thymallidae). Whitefishes are widespread species of fish in the subarctic and boreal zones of Europe, Asia and North America and are the most important components of the ecological system and valuable objects of local and industrial fishery. But these fishes are frequently affected by parasitic diseases. This article contains the description of most common parasitic diseases of whitefish and of the main causative agent, clinical signs of diseases, and the main preventive measures to prevent the occurrence of these diseases in whitefish culture. Aquaculture of whitefish creates a competitive food production for one or two fattening seasons with their delicacy gastronomic benefits and high economic profitability. Products of whitefish are popular on external markets that is also a good motivation for improvement of the biotechnological development for various methods of cultivation of these valuable fish. However, with increasing amounts of production, transporting fish from one farm to another and crowded stocks of fish result in problems with diseases of different etiology. The above material describes main parasitic diseases that occur in whitefish including their main symptoms, which will help to identify them in time. Practical value. Information on the main parasitic diseases of whitefish was systematized. Most of the parasitic diseases known to the whitefish are ectoparasitosis. These are ichthyobodosis (costosis), trichodinosis, chylodonelosis, ichthioftirioz, trichophthirioz and cruciformis. Proteocephalosis, acanthocephalosis, diplomystomosis are the most dangerous among helminths. The short characteristic of these diseases is described and the methods of prophylaxis of these diseases are suggested. The review can be useful both for scientists dealing with the problem of whitefish acclimatization on the territory of Ukraine and for fish breeders already engaged in the whitefish aquaculture in Ukraine and abroad. Descriptions of symptoms of diseases will be useful for preliminary diagnostics of diseases. Key words: whitefish, parasites, ectoparasites, helminthes, diseases, ichthyobodosis, trichodionosis, chylodonelosis, ichthioftirioz, trichophriosis, chloromycosis, ergazilosis, lerneosis, argulosis, roteocephalosis, mechinorinchosis, diplostomosis.


1970 ◽  
Vol 2 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Tirtha Bahadur Shrestha

Nepal is nature's paradise. It's a small attractive package of nature embracing the rich biological diversity in the tiniest area. One of the nature's gifts to Nepal is its vegetation. The narrow strip of land harbours over 170 parcels of vegetation. The need of categorisation of Nepal's forest type is thus not only needed to acknowledge the rich diversity but also to make it applicable in scientific studies and researches. This paper endeavours to classify the Nepal's forest according to all the rational parameters yet avoiding the strict compartmentalisation which is near to impossible as in the case of natural and life bearing heritage like forest. Key Words: Forest type, Ecological map, Classification, Protected areas DOI: 10.3126/init.v2i1.2512 The Initiation Vol.2(1) pp1-9


1979 ◽  
Vol 36 (11) ◽  
pp. 1319-1324 ◽  
Author(s):  
D. E. Wickham

Laboratory experiments analyzing the correlation between epibiotic fouling and mortality of the eggs of the Dungeness crab, Cancer magister Dana, reveal that both can result from predation on crab eggs by the nemertean Carcinonemertes errans Wickham. Fouling appears to be stimulated by the release of yolk material into the egg clutch through worm feeding and defecation. Significant correlations exist between worm density and both fouling and mortality in field samples. The ranking of the correlations between these three parameters suggest that nemertean activity is the causative agent and that fouling is only incidentally correlated to egg mortality through its correlation to worm density. Key words: Carcinonemertes errans, Cancer magister, crab-egg fouling, crab-egg mortality


Bacteriology ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 30-34
Author(s):  
L.I. Marinin ◽  
◽  
N.A. Shishkova ◽  
A.N. Mokrievich ◽  
I.A. Dyatlov ◽  
...  

The article discusses the issue of the danger of earthworms in the spread of anthrax in connection with the long-term persistence of the causative agent of the disease in the soil of cattle burial grounds. The results of assessing the effect of earthworms on soil cleansing from the anthrax pathogen and the properties of microorganisms isolated from worms are presented. Studies have shown that under the influence of worms, the amount of anthrax pathogen in the soil decreases by 30–50%, but the remaining spores did not change their properties and retained all the main biological and genetic factors of pathogenicity. Key words: earthworms, anthrax causative agent, spore culture, cultivation


Author(s):  
Victor Tsutsumi ◽  
Adolfo Martinez-Palomo ◽  
Kyuichi Tanikawa

The protozoan parasite Entamoeba histolytica is the causative agent of amebiasis in man. The trophozoite or motile form is a highly dynamic and pleomorphic cell with a great capacity to destroy tissues. Moreover, the parasite has the singular ability to phagocytize a variety of different live or death cells. Phagocytosis of red blood cells by E. histolytica trophozoites is a complex phenomenon related with amebic pathogenicity and nutrition.


2018 ◽  
pp. 3-14

Gastrointestinal stromal tumors (GIST) are the most common mesenchymal tumors of the digestive tract (1%). These tumors express the CD 117 in 95% of cases. The stomach is the preferential localization (70%). Diagnosis is difficult and sometimes late. Progress of imaging has greatly improved the management and the prognosis. Computed tomography (CT) is the gold standard for diagnosis, staging, and treatment follow-up. The increasing recognition of GIST’s histopathology and the prolonged survival revealed some suggestive imaging aspects. Key words: gastro-intestinal stromal tumors; computed tomography; diagnosis


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