SVIBOR - Papers quoted in CC - project code: 4-07-012
MINISTRY OF SCIENCE AND TECHNOLOGY
Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
E-mail: ured@znanost.hr
SVIBOR - Collecting Data on Projects in Croatia
Papers quoted in Current Contents on project 4-07-012
Quoted papers: 39
Other papers: 132
Total: 171
Title: Nutritive value of marine algae Laminaria japonica and
Undaria pinnatifida
- Authors:
- Jurković, Nada
- Kolb, Nada (21694)
- Colić, Irena
Journal: Die Nahrung
Number: 1
ISSN: 0027-769x
Volume: 39
Year: 1995
Pages: from 63 to 66
Number of references: 16
Language: engleski
Summary: The chemical composition, that is crude proteins, fats,
carbohydrates, cellulose, ashes, minerals and nucleic acids were determined
in two commercially availble marine algae: Laminaria japonica and Undaria
pinnatifida. The energetic value and energetic share of proteins, fats and
carohydrates were calculated. The results were discussed in terms of
importance of marine algae in human diet.
Title: Scale-up on Basis of Structured Mixing Models: A New
Concept
- Authors:
- Mayr, Bernhardt
- Nagy, E.
- Horvat, Predrag (120253)
- Moser, Anton
Journal: Biotechnology and Bioengineering
Number: 3
ISSN: 0006-3592
Volume: 43
Year: 1994
Pages: from 195 to 206
Number of references: 37
Language: engleski
Summary: A new scale-up concept based upon mixing models for
bioreactors equipped with Rushton turbines using the tanks-in-series
concept is presented. The physical mixing model includes four adjustable
parameters, i.e., radial and axial circulation time, number of ideally
mixed elements in one cascade, and the volume of the ideally mixed turbine
region. The values of the model parameters were adjusted with the
application of a modified Monte Carlo optimization method, which fitted the
simulated response function to the experimental curve. The number of
cascade elements turned out to be constant (N=4). The model parameter
radial circulation time is in good agreement with the one obtained by the
pumping capacity. In case of remaining parameters a first or second order
formal equation was developed, including four operational parameters
(stirring and aeration intensity, scale, viscosity). This concept can be
extended to several other types of bioreactors as well, and it seems to be
a suitable tool to compare the bioprocess performance of different types of
bioreactors.
Keywords: bioprocess, stirred tank, structured mixing model, scale-up
Title: Hochleistungsbiologie und Membrantrenntechnik zur
Abwasserreinigung: Fallstudie Deponiesickerwasser
- Authors:
- Mayr, Bernhardt
- Novak, Srđan (85892)
- Horvat, Predrag (120253)
- Gaisch, F.
- Narodoslawsky, M.
- Moser, Anton
Journal: Osterreichische Wasser und Abfallwirtschaft
Number: 7/8
Volume: 46
Year: 1994
Pages: from 195 to 202
Number of references: 19
Language: njemački
Summary: A pilot plant consisting of two bioreactors (aerobic and
anoxic) with a dry solid matter content of more than 25 kg/m3 during the
steady operating phase and of a ceramic-membrane microfiltration unit
followed by a reversal osmosis unit equipped with bandage elements was used
for purifying leachate water from two different landfills. Purification was
continued until a quality suitable for direct discarge was reached as
specified in Emission Order nr. 613 of 24 September 1992 issued by the
Austrian Minitry of Agriculture and Forestry.
Title: Temperature and Dissolved Oxygen Concentration as
Parameters of Azotobacter chroococcum Cultivation for use in Biofertilizers
- Authors:
- Šantek, Božidar
- Marić, Vladimir (28422)
Journal: Biotechnology Letters
Number: 4
ISSN: 0141-5492
Volume: 17
Year: 1995
Pages: from 453 to 458
Language: engleski
Summary: Azotobacter chroococcum was grown in continuous culture at
two temperatures (30 oC and 20 oC) and different oxygen tensions (DOT) (30
% to 40 % and 70 % to 80 % of air saturation), respectively. At the
temperature of 30 oC and low DOT a relatively high volumetric productivity
and efficiency of nitrogen fixation were obtained. After lowering the
temperature to 20 oC, an intensive formation of cysts was observed
associated with a drastic decrease of the bacterial growth. Bacteria in the
form of cysts kept their physiological activity for a long period of time
depending on temperature and preparation.
Title: Effect of Physico-Chemical Factors on Growth of Starter
Culture for Wine Malolactic Fermentation
- Authors:
- Božanić, Rajka
- Runjić-Perić, Vjera (39790)
- Pavušek, Ivanka (35771)
- Marić, Vladimir (28422)
Journal: Prehrambeno-tehnol. biotehnol. rev
Number: 2/3
ISSN: 0352-9193
Volume: 32
Year: 1994
Pages: from 111 to 114
Number of references: 14
Language: engleski
Summary: The induction of the malolactic fermentation (MLF) by
inoculating a wine with selected malolactic bacteria has, recently,
received immense enologists' attention because of its positive influence on
quality and sensory characteristics of wine. The strains of L. oenos adapte
to grow in adverse conditions of fermentation were the most frequently use.
Since MLF of wines is performed in adverseconditions for bacterial growth
in this paper the effects of temperature and pH lower than optimal, and
different ethanol and SO" concentrations on the growth of strain UR were
investigated with optimal value of at least one factor of growth. The
simultaneous effect of these factors combined by Graeco-Latin Square method
was also investigated. The optimal conditions determined for the growth of
the investigated strain are:37 oC and pH 6.5. The growth of L. oenos UR was
good at 25 oC, while lower pH and higher ethanol volume fractions inhibited
bacterial growth significantly. The investigation of SO2 concentration
showed that only the highest SO2 concentration in medium slightly
suppressed bacterial growth after 24 h of cultivation. It was estimated
that the share of medium pH value is the most significant: 73 % and 88.4 %
after 24 h and 120 h of growth, respectively.
Title: The Influence of Biomass Preparation on Physiological
Activity of Bacterium Lactobacillus plantarum Strain L4 During Storage at
Different Freezing Temperatures
- Authors:
- Runjić-Perić, Vjera (39790)
- Poljak, Sanja
- Bobić, Vedranka
- Božanić, Rajka
- Pavušek, Ivanka (35771)
Journal: Prehrambeno-tehnol. biotehnol. rev
Number: 4
ISSN: 0352-9193
Volume: 32
Year: 1994
Pages: from 167 to 170
Number of references: 15
Language: engleski
Summary: Today the lactic acid bacteria (LAB) are routinely used as
starter cultures in fermented food production; species Lactobacillus
plantarum is used for vegetables and olives conservation, ensiling and
malolactic fermentation of wines. In this work the influence of Lb.
plantarum L4 biomass preparation for long-term preservation by freezing at
different temperatures on physiological activity (i.e., viability and
metabolic activity) was investigated. During 100 days of storage at -20,
-30 and -70 oC the viabulity of cells by plate count method and metabolic
activity via lactic acid production were followed. At all investigated
freezing temperatures through the storage period the survival of Lb.
plantarum L4 in BNNM was complete. Meanwhile, in washed biomass (WB) the
survival of cells was considerably poorer, i. e., after 100 days of storage
at -20, -70, and -30 oC there was only 42, 48 and 5 % of living cells,
respectively. The survival of Lb. plantarum L4 in CB at investigated
temperatures was among 71 and 81 %. In all experimental conditions at the
end of storage period the metabolic activity of frozen/thawed cells
expressed as lactic acid production ratio of these cells and nonfrozen
control was between 86 and 90 %.
Title: Purification of Landfill Leachates by Means of Combined
Biological and Membrane Separation Treatment
- Authors:
- Mayr, Bernhardt
- Novak, Srđan (85892)
- Horvat, Predrag (120253)
- Gaisch, F.
- Narodoslawsky, M.
- Moser, Anton
Journal: Chem. Biochem. Eng. Q.
Number: 1
Volume: 9
Year: 1995
Pages: from 39 to 45
Number of references: 16
Language: engleski
Summary: The pilot plant consisting of two bioreactors (aerobic and
anaerobic), together with microfiltration and reverse osmosis units was
used to conduct the pruification of leachates from two sanitary landfills.
One leachate was heavily loaded and contained about 6 kg/m3 of
ammonium-nitrogen and organic matter expressed as gama COD in the qualiti
of 30 kg/m3. After the careful adaptation of the culture high efficiency of
ammonium-nitrogen and COD removal was achieved in the steady state. The
productivity of ammonium-nitrogen removal was more than 1 kg/m3d, and
neither additional carbon source nor pH correction was necessery. The
second leachate had lower level of gama COD and gama-ammonium-nitrogen.
Nevertheless, because of the lower C:N ratio and low COD biodegradability
additional carbon source was necessary for an efficient nitrogen removal.
After the biological treatment and microfiltration both permeates were
treated further by two-step reverse osmosis giving in both cases the
purified water which could be used for technoical purposes.
Keywords: Landfill leachates, nitrification, denitrification, chemical oxygen demand (COD)
Title: The Influence of Temperature on Production of Organic
Acids in Dough Fermentation with Lactobacillus brevis, Saccharomyces uvarum
and Candida krusei (in Pure and Mixed Cultures)
- Authors:
- Grba, Slobodan (14222)
- Stehlik-Tomas, Vesna (44734)
- Šehović, Đurđica (46376)
- Romac, Saša
Journal: Prehrambeno-tehnol. biotehnol. rev
Number: 1
ISSN: 0352-9193
Volume: 33
Year: 1995
Pages: from 43 to 46
Number of references: 13
Language: engleski
Summary: The conditions of dough fermentation with L. brevis
bacteria in pure and mixed S. uvarum/C. kerusei cultures have been explored
in order to produce optimal quantities of lactic, acetic and other organic
acids capable of improving dough properties. These acids give a more
aromatic flavour to the bread, increase its durability and reduce bread
crumbling and deterioration. It was found that dough souring with L. brevis
and yield 200 (dough and wheat flour ratio x 100) produced the maximal
quantity of lactic acid when fermentation temperature at 30 to 35 oC (0.76
%). In these conditions the fermentation temperature had no influence on
the production of lactic acid. The greatest concentrations of acetic and
lactic acids were obtained with a mixed L. brevis/C. krusei culture at 30
oC (0.9 % lactic acid, and 0.2 % acetic acid). The best results in the
production of organic acids were achieved in dough fermentation that was
carried out with a mixed L. brevis/S. uvarum culture. When dough was soured
at 25 to 35 oC, concentrations of i-butyric, valeric, i-valeric and
unindetified acids, in addition to lactic acid (0.7 %) and acetic acid (0.2
%), have also been quantified.
Title: Growth of Bacteria Lactobacillus brevis and Simultanous
Production of Metabolites in Different Media
- Authors:
- Stehlik-Tomas, Vesna (44734)
- Grba, Slobodan (14222)
Journal: Prehrambeno-tehnol. biotehnol. rev
Number: 4
ISSN: 0352-9193
Volume: 31
Year: 1993
Pages: from 151 to 155
Number of references: 20
Language: hrvatski
Title: Cultivation of Yeast Candida tropicalis 212 and Candida
utilis 49 in Alfalfa Juice
- Authors:
- Mehak, Milena (51414)
- Lončar, Linda
- Matošić, Srećko (71284)
- Grba, Slobodan (14222)
Journal: Prehrambeno-tehnol. biotehnol. rev
Number: 1
ISSN: 0352-9193
Volume: 32
Year: 1994
Pages: from 7 to 12
Number of references: 25
Language: engleski
Summary: Alfalfa juice, the waste product in green mass processing
was investigated as nutritive medium for the cultivation of yeast as an
animal feed supplement. The nutritive medium composition was optimized by
addition of molasses which was diluted by juice as substitute for water.
Both investigated yeasts Candida tropicalis 212 and Candida utilis 49
exhibited similargrowth and substrate assimilation kinetics u=0.228 1/h,
Yx/s=0.614 g/g. To achieve better productivity as well as economy of
Candida yeasts biomass cultivation, the experiments were carried out
without steam sterilization of the nutritive medium. It was only
disinfected by sodium hypochlorite (gama=2 g/L). The results obtained
indicate the possibility of a relatively simple and economically favorable
production of yeasts biomass on the location of alfalfa plant processing.
Title: Application of Genetic Engineering in the Improvement of
Lactic Acid Bacteria
- Authors:
- Brkić, Blaženka
- Šušković, Jagoda (40116)
- Matošić, Srećko (71284)
Journal: Prehrambeno-tehnol. biotehnol. rev
Number: 1
ISSN: 0352-9193
Volume: 32
Year: 1994
Pages: from 35 to 43
Number of references: 74
Language: hrvatski
Title: TRansport and Regulation of Carbohydrate Metabolism in
Yeast Saccharomyces cerevisiae: I. Glucose, Fructose and Mannose
- Authors:
- Novak, Srđan (85892)
- Marić, Vladimir (28422)
Journal: Kem. Ind.
Number: 8
ISSN: 0022-9830
Volume: 44
Year: 1995
Pages: from 341 to 353
Number of references: 114
Language: hrvatski
Title: Optimization of the RNA content reduction in Saccharomyces
cerevisiae
- Authors:
- Beluhan, Sunčica
- Marić, Vladimir (28422)
Journal: Prehrambeno-tehnol. biotehnol. rev
Number: 2/3
ISSN: 0352-9193
Volume: 33
Year: 1995
Pages: from 85 to 90
Number of references: 25
Language: engleski
Summary: Yeast as a source of protein for human consumption is
limited by its relatively high nucleic acid content. In this work we have
studied the problem of RNA extraction in yeast Saccharomyces cerevisiae
(fresh bakers yeast) by optimization of the concentration of alkali
solution (NH4OH). Extractions with 5, 10, and 15 % of NH4OH (reffering to
yeast dry matter) were incubated for 15 minutes at 45-80 oC (step 5 oC)
measuring losses of protein and biomass and percent of nucleic acid
reduction. With relatively low mass ratio (10 % NH4OH) at 60 oC, a final
RNA content of 1.73 % was obtained after an extremely reduced extraction
time of only 15 minutes. After the extraction procedure, RNA was recovered
by fractional precipitation lowering pH (1st step pH=4.9; 2nd step pH=2.0)
by addition of HCl. Two solid fractions were obtained and RNA content in
the precipitate was analyzed. The yield in the second precipitate was 0.721
g RNA obtained per g RNA in native yeast (72.1 %). Purity of second
precipitate was 69.7 %.
Title: Enzymic Hydrolysis of Protein During Barley Spent Grains
Mashing
- Authors:
- Marković, Ivan
- Deponte, R.
- Marić, Vladimir (28422)
- Johanides, Vera (18803)
Journal: Process Biochemistry
Number: 5
ISSN: 0032-9592
Volume: 30
Year: 1995
Pages: from 411 to 419
Number of references: 35
Language: engleski
Summary: High nitrogen barley syrup (HNBS) was obtained by mashing
barley spent grains with neutral proteinase. The total nitrogen to
carohydrate ratio in the HNBS was three times higher than in typical barley
syrup. In order to enhance the liberation of free amino acids, the spent
grains were hydrolysed simultaneously with proteinase and barley peptidase
extract; the a-amino to total nitrogen ratio increased from 11.4 to 14.6 %.
During mashing with peptidase extract, the protein solubilization rate was
lower than during mashing with neutral proteinase only. Data analysis by
means of the modified Foster-Niemann equation suggested that endopeptidase
inhibitors, possibly present in the peptidase extract, caused the decrease
of protein solubilization rate. The isolation of the bacterial proteinase
inhibitors from peptidase extract indicates that they affected the protein
solubilization process.
Title: Transition Metal Complexes of N, N-Dimethylthreonine:
Stability and UV/Vis Spectra
- Authors:
- Blagović, Branka (142202)
- Paulić, N.
- Raos, N.
- Simeon, V.
Journal: Monatshefte fur Chemie
Volume: 125
Year: 1994
Pages: from 1083 to 1089
Number of references: 13
Language: engleski
Title: Brewers Yeast activity in correlation with reduced
glutathione (GSH) and adenine nucleotide concentrations
- Authors:
- Kolb, Nada (21694)
- Marić, Vladimir (28422)
Journal: Preceedings of the 6th European Congress on Biotechnology
Volume: 2
Year: 1994
Pages: from 1101 to 1105
Number of references: 13
Language: engleski
Information: svibor@znanost.hr
