ARTICLES 2006                                   
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Preliminary data concerning zooplankton and zoobenthos communities
of the Lower Mureş River from the Lunca Mureşului National Park (Arad County)

Karina Battes1,2, Claudia Pavelescu1,2

1PhD Student, Babes-Bolyai University, Faculty of Biology and Geology, Clinicilor Str., No. 5-7
2 Contact persons: K. Battes - kbattes@yahoo.com, C. Pavelescu: claudipav@yahoo.com

 

Abstract. The present paper represents an inventory of aquatic fauna from the lower Mureş River, downstream of Arad, in the Lunca Mureşului National Park. Zooplanktonic microcrustaceans and zoobenthonic communities were considered for the study. The samples were taken in the year 2004, using the qualitative sampling equipment not only for zooplankton but also for zoobenthos communities.

Keywords: taxonomical diversity, lower course, the MureşRiver,
zooplankton microcrustaceans, zoobenthonic community.

 


Ecological study regarding the aquatic invertebrate communities
from the Someşul Mic River

Daniel ŢURA1,*, Camelia IONESCU1, Claudia PAVELESCU2,*

1 Msc student, Babeş-Bolyai University, Faculty of Biology and Geology,
Clinicilor Str., No. 5-7, 400006, Cluj-Napoca,
2 PhD student, Babeş-Bolyai University, Faculty of Biology and Geology,
Clinicilor Str., No. 5-7, 400006, Cluj-Napoca,
* Contact persons: D. Tura: turadaniel21@yahoo.com, C. Pavelescu: claudipav@yahoo.com

 

Abstract. The present paper represents a quantitative study concerning benthic communities from the Someşul Mic River. Aspects of water quality assessment were also considered. Three sampling sites were strategically located along the river, in order to point out different ecological conditions. As expected, the analyses revealed that the upper course of the river was undisturbed, due to little or no human impacts. On the other hand, the sites located downstream Cluj-Napoca recorded lower water quality.

Keywords: the SomeşulMicRiver, benthic communities, diversity, density, water quality.

 

Research concerning intestinal parasitosis in infant population
discovered in two clinic laboratories from Oradea (Romania)

Daniel-Dumitru PORTELECHI1, Nicolae TOMESCU2

1 Bsc Student, University of ORADEA; Faculty of SCIENCE, Universităţii, Street, No. 1
2 University „Babes-Bolyai” Cluj-Napoca, Faculty of Biology and Geology, Clinicilor Street nr. 3-5

Abstract. Considering the research made and the data offered by the specialists in parasitology from Oradea’s no.1 Polyclinic and Children’s Hospital, we have established that children from 1 to 18 years old have been found infected with 7 species of human parasites. Giardia lamblia, Blastocystis hominis, Ascaris lumbricoides, Oxyurus vermicularis, Trichurus trichiura, Hymenolepis nana, Hymenolepis diminuta

 

Feeding niche characteristics of a Bombina bombina population
from Livada Plain (Satu-Mare County, Romania)

Edina SZÉPLAKI1, Lilla ASZALÓS1, Nicoleta-Réka RADU1, Aniela FILIMON1, Lucia LUCA1

1Bsc. Student, University of Oradea, Faculty of Sciences, department of Biology

 

Abstract. Along our study we analyzed the food of 87 individuals of Bombina bombina. The reduced number of empty stomachs indicates that there were optimal feeding conditions. In the obtained stomach contents we identified vegetal remains (c23=0.97, p=0.002), shad-skins fragments (c2=11.21, p=0.1) and animal type food. We identified a total number of 1498 preys belonging to 37 categories. Most of the identified preys proceed from terrestrial environment (Amean=72.97 %, DSA=45.46). The most important preys items from the diet of the studied fire-bellied toads are: Collembola (Amean=28.98%; Fmean=31.59%, c23=23.35, p=0.13), Coleoptera’s adults (Amean=34.25%; Fmean=67.74%, c23=1.53, p=0.004) and Hymenopera Formicidae (Amean=15.02%; Fmean=33.93%, c23=23.35, p=0.09). There was noticed an important seasonal variation at the consumed preys’ level. Diet diversity presents seasonal changes (Hmean=1.7, SDH=0.62). The trophic niche overlap, according to Pianka’s index, presents the highest values between May and June (Q=0.87) and April-June (Q=0.967).

Keyzwords: Bombina bombina, feeding, trophical niche

 

The comparative analyze of the trophic spectrum of two Bombina variegata populations from Băiţa Plai (Bihor county, Romania)

Violeta I. PETER1, Luminiţa CITREA2, Ágnes ASZALÓS3,
Zsolt BATTA3, Melinda SZABÓ3, Călin CIOARA3

1Msc. Student, University of Oradea, Faculty of Sciences, Department of Biology
2Onisifor Gibu High School, Oradea
3Bsc. Student, University of Oradea, Faculty of Sciences, Department of Biology

 

Abstract. The present study brings completions to the existing data about the trophic spectrum of the yellow-bellied toad. Its diet is composed of prey taxa belonging to invertebrates: Coleoptera, Hymenoptera Formicida, Nematocera larva, Homoptera Aphids, Colembola as well as Crustacea Cladocera. Beside animal preys in the stomachs contents there were identified vegetal and shed-skins. The most significant differences were recorded when we compared the diet composition of the individuals belonging to the two studied habitats, having in view the very obvious difference of their aspect. Beside these, we also identified differences determined by the sex and size of the individuals or by the collecting period.

Keywords: trophical spectrum, Bombina variegata, prey taxa

 

Note about the feeding of a Triturus cristatus population from Şuştiu (Bihor county, Romania)

Alfred Şt. CICORT-LUCACIU1,*, Letiţia BOGDAN2,
Annamária TÓTH3, Iuliu ORBAN3, Olivia BĂBUŢA3

1Doctoral student, Babeş-Bolyai University, Faculty of Biology and Geology, Cluj-Napoca, Romania
2Pedagogic High School, Oradea
3Bsc. Students, University of Oradea, Faculty of Sciences, Department of Biology
*Contact person: A.St. Cicort-Lucaciu – alfred_cicort@yahoo.com

 

Abstract. The Triturus cristatus population from Şuştiu has optimal feeding conditions, all the individuals having stomach contents. The newts had consumed diverse preys belonging to several prey taxa as well as vegetal remains, shed-skins and eggs. The feeding of the individuals of the two sexes is different, females feeding more intensively but less diversified than males. It seems that in this case the two sexes use different strategies to obtain the preys.

Keywords: feeding, Triturus cristatus, prey taxa, seasonality

 

Data regarding the trophic spectrum
of a population of Rana esculenta Complexfrom Bacău County

Daniel GHIURCĂ1,*, Lăcrămioara ZAHARIA2,*

1„Ion Borcea” Natural Sciences Museum, Cancicov Park, Bacau, Romania
* Contact persons: D. Ghiurca: danielghiurca@yahoo.com, L. Zaharia: lacraro@yahoo.com,
Tel: +40 234 512006

 

Abstract.  We analyzed the trophic spectrum of one population of Rana esculenta complexcollected, placed close to the lake accumulation Bacău II. The most abundant prey taxons in the food of edible frog are species from Coleoptera order, followed by Hymenoptera and Diptera among insects and Aranee among spiders. We identified a great number of gregarious small species (Formicidae) showing an opportunistic predator behavior of this frogs, using the sit and wait foraging behavior. The terrestrial preys prevail in comparison with aquatic organisms.

Key words: trophic spectrum, prey taxa, Rana esculenta complex

 

Trophical spectrum of a Bombina variegata population
from Vadu Crişului (Bihor County, Romania)

Marius I. GROZA1,2, Noémi SZEIBEL1, Viorica LETAI1, Annamária TÓTH1, Nicoleta R. RADU1

1Bsc. Student, University of Oradea, Faculty of Sciences
2Corresponding author: M. Groza: gim_australian@yahoo.com

Abstract. We studied the trophical spectrum of Bombina variegata species from Vadu Crişului, Bihor County. The study was realized during the period May-June 2005. We observed certain differences in feeding between males and females. At the same time there is a difference between the two periods of study. These differences may appear because of the temperature changes or because of the preferences of sexes for various preys. The feeding intensity is proportional with the temperature raising. The studied stomachs contain animal prey and at the same time we found vegetal fragments and shed skin. The most important preys for males were from Cladocera and Coleoptera order and for the females the biggest source of food was Coleoptera and Formicida.

 

Keywords: food composition, Bombina variegata, males, females, juveniles

 

The alteration of proportion of different lizard species
compared to each other at The Great Pasture of Hajdúbagos

Zsuzsanna ANTAL1

1University of Debrecen Faculty of Agriculture,
Department of Nature Conservation Zoology and Game Management,
Böszörményi street 138., Debrecen 4032, Hungary, e-mail: zsuzsannaantal@gmail.com

 

Abstract. Three different lizard species can be found at the great pasture of Hajúbagos. These are the balkan or crimean wall lizard (Podarcis taurica), the sand lizard (Lacerta agilis) and the green lizard (Lacerta viridis). All of them are protected by law in Hungary but while sand lizard and green lizard is common all over the country, the amount of the balkan wall lizard is decreasing. The main cause of this regrettable possession is the habitat degradation and thus habitat loss. Namely balkan wall lizard not only prefers but suffers open sand grasslands and these kinds of habitats are disappearing in Hungary. Due to the fact that the extensive animal grazing lost its importance, open sand pastures started to change, succession can be realized. Thus grass closing constantly what is favourable for sand lizard and green lizard. Furthermore sand lizard and balkan wall lizard share roughly the same food source and moreover green lizard could possibly pass into a predator of balkan wall lizard juveniles also. Therefore sand lizard and green lizard became competitors (or predators) of balkan wall lizard and the proportion of the three species compared to each other is changing.  My aim is to examine the vegetation change and simultaneously monitor the amount of the mentioned three lizard species. After all I would like to make a well established proposal on the management of protected grasslands.

 

Preliminary data concerning the distribution of amphibian fauna
in Suceava county (Romania)

Alexandru STRUGARIU1,*, Iulian GHERGHEL2, Mihail Victor HUŢULEAC-VOLOSCIUC3,
Tiberiu Constantin SAHLEAN1, Istvan SAS4,*, Cristina Maria PUŞCAŞU5

1 ”Al. I. Cuza” University, Faculty of Biology, Iasi, Romania.
2 ”Piatra Neamt” Technical College, Piatra Neamt, Romania
3 “Mihai Eminescu” National College, Suceava, Romania
4  University of Oradea, Faculty of Science, Oradea, Romania
5 “Gr.T.Popa” University, Faculty of General Medicine, Iasi, Romania
*Corresponding autor: Al. Strugariu - Alex.Strugariu@gmail.com,  I. Sas – sas_steve19@yahoo.com

 

Abstract. The present study focused upon an area in which the herpetofauna had previously been very poorly studied and aimed to identify the species of amphibians from the research area and to establish distribution areas. In the 54 investigated localities 16 species of amphibians (Salamandra salamandra, Triturus vulgaris, Triturus cristatus, Triturus alpestris, Triturus montandoni, Pelobates fuscus, Bombina bombina, Bombina variegata, Hyla arborea, Bufo bufo, Bufo viridis, Rana dalmatina, Rana temporaria, Rana arvalis, Rana ridibunda & Rana lessonae) and 2 hybrids (Bombina bombina X Bombina variegata & Rana kl. esculanta) have been identified. Of these, the Bombina hybrids have been identified for the first time in the studied region.

Key words:SuceavaCounty, herpetofauna, amphibians, geographical distribution

 

Distribution, habitat selection and facial morphology of setts of badgers
(Meles meles Linnaeus, 1758) in the region of Erdőspuszták (Eastern Hungary)

Lajos KOZÁK1, Miklos HELTAI2

1University of Debrecen, Hungary 4032 Debrecen, Böszörményi út 138., e-mail: kozakla@agr.unideb.hu
2Szent István University, Hungary 2013 Gödöllő, Páter K. u. 1., e-mail: Heltai.Miklos@vvt.gau.hu

 

Abstract. The badger’s population density has shown a general increase in Hungary since the 1980s. The data show that the species has occurred in wide range in areas (like lowland areas) which are not known as traditional distribution area of badgers. The traditional habitats of badgers in Hungary are the hilly deciduous forests. But in the lowland area around Debrecen we recognized increasing distribution and population density of the species. In this study we show the present status of the species in the semi-natural and planted forests and deforested areas around Debrecen and the habitat selection and the morphology of inhabited setts of the badgers living in these forests in a sample area.
We recorded data on general distribution by questionnaires sent to hunting companies. The population density and habitat selection of the sample area was measured by recording of locality of setts of badgers. We used the method of line transect and analysis of habitat type through satellite pictures and GPS coordinates. To have data on morphology of setts we recorded the number of entrances, the exposure, covering, macro- and microrelief, occurrence of latrines.
Our data show that the badgers are widely distributed in this area and their population density reached the density of the species traditional habitats (2,44 setts/hectare). The habitat selection shows a small preference (Ivlev-index = 30%) to the forested areas. This small preference to the forests shows that the covering of the habitat is not the single crucial factor of their habitat selection. The level of preference to the several forest types shows that the badgers of the sample areas prefer (Ivlev-index = 58 %) the planted pine forests (Pinus sylvestris). This result is similar to other research results made in other part of Hungary but out of accordance to the results of researches made in England.

Keywords: badger, sett density, habitat preference

 

Hexadactyly case at a Rana kl. esculenta sample
from the north-western part of Romania

Istvan SAS1, Eva-Hajnalka KOVACS2

¹University of Oradea, Faculty of Sciences, Department of  Biology, Oradea, Romania, sas_steve19@yahoo.com
²Msc student, University of Oradea, Department of  Biology, Oradea, Romania, hajni_81@yahoo.com

 

Abstract. At 17 June 2006, in a habitat close to Gherţa Mică locality (47°56'0'' N, 23°14'0'' E, Satu-Mare County, Romania) we had found a sample of Rana kl. esculenta which presented hexadactyly at both of its posterior feet. The captured sample of edible frog had fully formed extra (sixth) toes, with phalanges (bones). The hexadactyly was perfectly symmetrical at both of the posterior feet. At this individual we did not discovered any other malformations, the biometrical characters situating in the variations limits of the other green frogs from the studied habitat. A symmetric hexadacytly can be a result of atavism.

Keyewords: Rana kl. esculenta, hind limb, symetric, hexadactyly

 

Aspects regading the capacity of gluconeogenesis regulation of the rat perfused liver

Delia Anca HAŞ-LĂZĂU1

1School 08, Mihai-Bravu, delia_lazau@yahoo.com

 

Abstract. The liver, also known as „the living laboratory of the organism”, is a vital organ, fulfiling a variety of functions, such as gluconeogenesis, which is glucose biosynthesis starting from non-glucidic precursors such as: lactate, faty acids, glycerol and amino acids, an extremely important biochemical process for the animal organism especially under starvation conditions, intense activity or/and pathological states (Paşca C., Kis E. 1999).
By combining the liver perfusion technique and electronic microscopy techniques, we have been able to show that the liver can synthetize the necessary glucose even under starvation conditions, from the lactate-piruvate mixture that has been perfused (Mokuda and Sakamato 1997; Parrila and colab. 2003; Ross and  colab. 1976; Sumida and colab. 1993; Sumida and colab. 2006). We have also highlighted the CCCP(carbonil-cianid-m-clorophenylhydrazone) effect on the gluconeogenesis process, at two different final concentrations :2 μmols and 50 μmols in the Krebs-Ringer serum.
The CCCP declutches the oxydative phosphorilation, making the proton gradient fade; if the concentration is low – 2 µmols – the effect lasts in time, and at high concentration – 50 µmols – it has an irreversible inhibiting effect on the gluconeogenesis.  

Cuvinte cheie: gluconeogeneză, precursori neglucidici, CCCP, lactat-piruvat, inaniţie.

Keywords: gluconeogenesis, non-glucidic precursors, CCCP, lactate-piruvate mixture, starvation conditions

 

 A study upon the influence of cyclophosphamide treatment
on the red blood cells of the chicken embryo

Delia Anca HAŞ-LĂZĂU1

1School 08, Mihai-Bravu, delia_lazau@yahoo.com

 

Abstract. The aim of this study is to show the effect of cyclophosphamide on the developing red blood cells of the 3-4 days old chicken embryo, when the hematopoiesis is at its peack, located at the vitelline sack level.
I have chosen to work with the chicken embryo red blood cells because they have an intense mitotic activity as well as a tumoural cell-like behaviour.
It is vital to know the particularities of the cell cycle of the healthy and tumoural cells, keeping in mind that most of the cytostatics act upon the cell which are developing their cell cycle (Menkes B., Prelipceanu O., Checiu I., Căpălnăşan I. 1979).
The cyclophosphamide is not stage-dependent, as it acts in all the stages of the cell cycle, its mutagen effect being accompanied also by a cell cycle stopping  (Paşca C., Crăciun C., Ardelean A. 2000).
Cyclophosphamide supply determines retrenchment of the cell division, transforming the normal cells into multinucleated cells, with normal ploydia. The cyclophosphamide is a cytostatic using for cancer therapy (Schiavoni G., Mattei F., Di Pucchio T., Santini S. M., Bracci L., Berardelli F., Proietti F. 2000).
Reshearches have done lots of studies along the years both on mice and rats, concerning the effects of cyclophosphamide on:  thymus and burse fabricio ( Giurgea R., Toma V., 1977), stromal cells of bone marrow (Anton E. 1997), pulmonary thrombocytopoiesis (Sulkowki S., Sulkowska M., Musiatowikz B. 1997).

Cuvinte cheie: ciclofosfamidă, citostatice, hematii, hematopoieză, sac vitelin.

Keywords: cyclophosphamide, cytostatics, red blood cells, hematopoiesis, vitelline sack level

 

Enzymological researches on the mud in the „Ochiul Mare”
Thermal Lake („1 Mai” Baths, Bihor county)

Ágnes PUSKÁS1, Manuela ŞEULEAN2, Mihail DRĂGAN-BULARDA3, Alina Dora SAMUEL4

1 Msc Student, University of Oradea, Facultaty of Sciences, Str. Universităţii, No.1, e-mail: agnes@lady.rdsor.ro
2 Msc Student, University of Oradea, Facultaty of Sciences, Str. Universităţii, No.1, e-mail: manu_seulean@yahoo.com
3 University „Babes-Bolyai”, Faculty of Biology and Geology, Cluj-Napoca, str. M. Kogălniceanu No.1, e-mail: draganb@bioge.ubbcluj.ro
4University of Oradea, Facultaty of Sciences, Str. Universităţii, No.1, e-mail: samuelalina@rdslink.ro

 

Abstract. The mud of the lakes beds is a complex microbial community and the bacterias' characteristics (like diversity, activity) indicate the ecological state of the lake. The mud samples were taken seasonally from four places in the Ochiul Mare lake and  were examined from enzymological point of view.
We have determined quantitatively the following enzymatic activities: dehydrogenase- (actual and potential), phosphatase-, catalase- and urease activities.
Every determined enzymatic activity had medium or high values. The actual and potential dehydrogenase activities and the phosphatase- and urease activities are the lowest in the samples, which were collected from the 3rd collection zone. This area is the most polluted zone of the lake and the microbes' growth is inhibited here. The catalase activity was the most intensive among the samples, which were collected from the 4th collection zone. The enzymatic activities showed little seasonal oscillation, reduced numerical fluctuation and the highest values were registered during the summer and in autumn.
The values of the Enzymatic Indicator of the Mud Quality (EIMQ) were the highest in the case of the samples collected from the 1st collection zone, which is the least polluted area of the lake. The low values of the Enzymatic Coefficient of Variety of the Mud Quality (ECVMQ) (0.088 – 0.162) indicate the sediments homogeneity in the whole lake and the enzyme activities' high stability independent of the investigated season.
Based on the obtained results it has been found that the Ochiul Mare lake's sediment has a medium but stable enzymatic potential, which is not influenced by seasonal fluctuations. This stability is insured by the stable microclimate of the thermal lake.

Keywords:sediment, enzymological research, Enzymatic Indicator of the Mud Quality (EIMQ),
Enzymatic Coefficient of Variety of the Mud Quality (ECVMQ), enzymatic potential

 

A comparative study on the microbial activities
in some caves from Pădurea Craiului Mountains

Manuela-Anelice ŞEULEAN1, Agnes PUSKAS1, Mihail DRĂGAN-BULARDA2, Alina SAMUEL3

1 Msc Student, University of Oradea, Facultaty of Sciences, Str. Universităţii, No.1, e-mail: manu_seulean@yahoo.com, agnes@lady.rdsor.ro
2 University „Babes-Bolyai”, Faculty of Biology and Geology, Cluj-Napoca, str. M. Kogălniceanu No.1, e-mail: draganb@bioge.ubbcluj.ro
3 Universitaty of Oradea, Facultaty of Sciences, Str. Universităţii, No.1, e-mail: samuelalina@rdslink.ro

 

Abstract. Microorganisms represent a heterogeneous group, widely spread in different environments. Our goal in this study was to determine whether microorganisms are present in four particular Transylvanian caves, which are: Ungurului Cave, Izvor Cave, Lesianei Cave, and Moanei Cave, all situated in the Pădurea Craiului Mountains. All of those caves are often visited by tourists. In order to conceive this study we have collected and analyzed different samples, using enzymatic and microbiological methods; the samples were taken from the floor deposits, wall deposits and sludge. Some enzymatic activities were studied, such as: catalase activity, phosphatase activity, actual and potential dehydrogenase activity, urease activity as well as the non-enzymatic catalytic activity. We have also computed the EISQ – which is the enzymatic indicator of soil or sludge quality – based on the results obtained by studying the enzymatic activities.

Keywords: sludge, wall deposits, enzymological research, Enzymatic Indicator of the Sludge Quality (EISQ), enzymatic potential

 

Relationships between enzymatic activities and chemical indicators
in a brown luvic soil

Alina Dora SAMUEL1,*, Monica ŞIPOŞ1

1 University of Oradea, Department of Plant Biology, Oradea, Romania.
* Contact person: samuelalina@rdslink.ro

 

Abstract.Actual and potential dehydrogenase and phosphatase activities and nitrate, ammonium and mobile phosphorus contents were determined in the 0–20–, 20–40– and 40–60–cm layers of a brown luvic soil submitted to a complex tillage and crop rotation experiment.
Each activity and each chemical content in both non-tilled and conventionally tilled soil under crops of both rotations decreased with increasing sampling depth. It was found that no-till – in comparison with conventional tillage – resulted in significantly higher soil enzymatic activities and nitrate, ammonium and mobile phosphorus contents in the 0–20– and in significantly lower activities and chemical contents in the deeper layers. The soil under maize or wheat was more enzyme-active in the 6– than in the 2–crop rotation. In the 2–crop rotation, higher enzymatic activities were registered under wheat than under maize; nitrate and ammonium contents were significantly higher under wheat excepting mobile phosphorus content. In the 6–crop rotation, higher enzymatic activities were registered under wheat; nitrate and mobile phosphorus contents were significantly higher under maize, while ammonium content was significantly higher under wheat. There were positive correlations between enzymatic activities and chemical indicators under each crop of both rotations.

Keywords: ammonium, dehydrogenase, nitrate, phosphatase, phosphorus

 

Preliminary study regarding the healthy state
of some decorative trees
from the University and N. Balcescu Parks of Oradea

Teodora STURZ1, Diana CUPSA2

1Bsc. Student, University of Oradea, Faculty of Sciences, Biology
2University of Oradea, Faculty of Sciences, Department of Biology, dcupsa@uoradea.ro

 

Abstract. During the present study we wanted to evaluate the diseases and pests of the ornamental tree species from University and Balcescu parks. From these two parks we have collected samples in three periods of the year – may, June and September. The samples consist from attacked leaves of 16 species of ornamental tree and shrub species. On the leaves collected in May we observed the presence of some attacks in the shape of small blurs or orifices. In June we have noticed the increase of the number of blurs and their dimensions were bigger. In September the blurs are more confluent covering almost the whole leaf. The attacked leaves roll up and they fall early. We determined a number of 7 types of diseases produced by bacteria, fungi or insects

 

Structure, diversity and seasonal dynamics of algal communities,
with special attention to diatoms,
from “Lacul Dulce” (Lake no.3) – Turda
(Cluj county, Romania)

Levente NAGY1,3, Laura MOMEU2,3 , Diana STAN2, Leontin Ştefan Péterfi1,3

1“Babeş-Bolyai” University, Faculty of Biology and Geology, 42 Republicii Street, RO-400015 Cluj-Napoca, Romania:
2“Babeş-Bolyai” University, Faculty of Biology and Geology, 5-7 Clinicilor Street, RO-400006 Cluj-Napoca, Romania
3“Contact persons: L. Nagy: levi_papaver@yahoo.com, L. Momeu: lmomeu@yahoo.com, L.S. Péterfi: peterfileontin@yahoo.co.uk

 

Abstract. Structure, diversity and seasonal dynamics of algal communities, with special attention to diatoms, from “Lacul Dulce” (Lake No. 3) –Turda (Cluj County, Romania). The subject of the present paper is the investigation of the algal communities inhabiting of Lake No. 3 (known as “Lacul Dulce”) from Turda, Cluj County. The algal flora of this lake has not yet been investigated. There have been identified 80 algal taxa, belonging to 5 phyla: Cyanoprokaryota (12 taxa), Dinophyta (5 taxa), Bacillariophyta (48 taxa), Euglenophyta (9 taxa) and Chlorophyta (6 taxa). A special attention was paid to the investigation of diatom communities, the group of algae that is the subject of the first author’s PhD thesis. The 48 identified diatoms belong to the following 7 families: Thalassiosiraceae, Chaetoceraceae, Fragilariaceae, Achnanthaceae, Naviculaceae, Bacillariaceae and Epithemiaceae. Some aspects regarding community structure, seasonal dynamics, ecological preferences (salinity concentration) were also studied and are discussed in the paper

Keywords: algae, community structure, salinity, dynamics, diversity, floristic similarity

 

The importance of apical domination and the size
of foliar surface in the acclimatisation process of
Chrysanthemum exvitroplantlets

Adriana PETRUS-VANCEA1

1University of Oradea, Faculty of Science, str. Universităţii, No. 1, Oradea – 4210087,
e-mail: adrianavan@yahoo.com

 

Abstract. In this experiment it was studied the effects of apical domination and foliar surface in Chrysanthemum exvitroplantlets surviving to normal condition of life. I found that the survivor of Chrysanthemum exvitroplantlets has depended of harming rate at which they were exposed.

Keywords: apical domination, foliar surface, acclimatization, Chrysanthemum

 

Liquid Nitrogen (-196°C) effect under pollen of some cultured or ornamental species

Monica ŞIPO޹, Sabina GLIGOR²

¹University of Oradea, Department of  Biology, Oradea, Romania,  siposmonica@yahoo.com
²Student, University of Oradea, Department of  Biology, Oradea, Romania

 

Abstract.The criopreservation involve the stock of the vegetal material at low temperatures (-196°C) in liquid nitrogen, in thermal conditions in which the division of cells and metabolic processes slow down, thus that the samplings may be conserved for long periods without suffering any genetic modifications. This stock technique is applied till present only on 80 vegetal species, keeping their seeds and vitrocultures preponderantly; researches were made regarding the maintenance of pollen in liquid nitrogen.

The mature pollen, able to resist a higher degree of desiccation, may be conserved at low temperatures, without criopreservation. It was made researches on criopreservation of rise, maize, wheat, roses, sun flower and soy pollen. Our study purpose was to follow the impact of liquid nitrogen (-196°C) about on viability of some cultured and ornamental species. The designed time of criopreservation it was 30 minutes and 7 days, using the TTC (tripheniltetrazole chloride) method which allows testing the viability of vegetal material based on dehydrogenase activity.
It was observed at Petunia hybrida species, that the pollen viability was low - in relevance with the witness represented from the pollen which was not resigned to the nitrogen liquid treatment - between percentage limits of 3.5-8%, in the case when the vegetal material was submersed 30 minutes in liquid nitrogen and 7.5-14.5% 7 days at (-196°C). The submersing of Nicotiana alata var. grandiflora species at 7 days, determined a low viability with 11.53%. The following two studied species Cucurbita and Hosta were proved to be the most resistant at submersing and maintenance in liquid nitrogen. The most affected pollen was Campsis radicans species. At Datura stramonium species was observed 2.59% a low viability of pollen, after 30 minutes of liquid nitrogen treatment, was 19.56%, after 7 days of submersing, the most pollen granules losing completely their viability.

Cuvinte cheie: crioprezervare, azot lichid, polen, Petunia hybrida, Nicotiana alata var. grandiflora, Cucurbita pepo, Hosta plantaginea, Campsis radicans, Datura stramonium

Keywords: criopreservation, liquid nitrogen, pollen, Petunia hybrida, Nicotiana alata var. grandiflora, Cucurbita pepo, Hosta plantaginea, Campsis radicans, Datura stramonium

 

Research concerning the reactions of Sequoia sp. plantlets
under culture, laid in horisontal and vertical position,
on culture medias, with and without growth regulators

Liviu POP1

1 Student, Universitatea din Oradea, Facultatea de Ştiinţe
Contact: transilvanpop@netzero.net

 

Abstract: In this study I looked to the reactions of Sequoia plantlets under cultivated „in vitro”, on different culture medias, laid in horizontal and vertical position, with and without growth regulators. This experiment has used apexes, the first under apical node and the basal node, taken from an old Sequoia „in vitro” culture, as biological material. The experiment, which lasted for 90 days, has brought forth the following conclusion: the most efficient culture medium, from the four different tested variants, seems to be V1.  In this medium the auxin had a huge effect on the callus development and the start of branching process of these plantlets. Also, the horizontal laid explants developed at a faster rate than the vertical ones.

Keywords: Sequoia, vitroculture, growth regulators

 

The allelopathic effect of the black nut leaves (Juglans nigra L.)
over the species of moon – raddish (Raphanus sativus L.) and white mustard (Sinapis alba L.)

Sorina CORBU1, Monica ŞIPOŞ2

1Colegiul National „E. Gojdu”, e-mail: mirceanegrut@Yahoo.com
2Universitatea din Oradea, e-mail: siposmonica@yahoo.com

 

Abstract. The present experiment is a research on the effect of the allelopathic substances in the leaves of the black nut (Juglans nigra L.) over the species of white mustard (Sinapis alba L.)  and the moon – raddish (Raphanus sativus L.). We have prepared a watery extract of a concentration of 5, 15, 25, 50, 75 and 100% from the leaves in different seasons (spring, autumn and winter). The watery extract presents an inhibitory effect over the germination and growth of the plants subdued to experiments, especialy over the leaves collected in spring.

Cuvinte cheie: alelopatie, stimulare, inhibitie, germinatie, crestere.

Keywords: allelopathy, stimulation, inhibition, germination, growing

 


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