Some factors affecting growth and survival ofRhizobium spp. in soil-peat cultures

1970 ◽  
Vol 32 (1-3) ◽  
pp. 113-130 ◽  
Author(s):  
D. A. van Schreven
Keyword(s):  
Growth And Survival ◽  
Factors Affecting

scholarly journals Lactobacillus fructivorans Spoilage of Tomato Ketchup

1997 ◽  
Vol 60 (5) ◽  
pp. 505-509 ◽  
Author(s):  
K. JOHANNA BJORKROTH ◽  
HANNU J. KORKEALA
Keyword(s):  
Gel Electrophoresis ◽  
Microbial Growth ◽  
Antimicrobial Agents ◽  
Growth And Survival ◽  
Factors Affecting ◽  
Physiological And Biochemical Characteristics ◽  
Gas Formation ◽  
Tomato Ketchup ◽  
Dna Fragment ◽  
Physiological And Biochemical

Spoilage characterized by bulging as a result of gas formation in bottled ketchup was studied, Samples produced microbial growth on MRS and Rogosa selective Lactobacillus agar. Seventy randomly selected isolates typed by using restriction endonuclease (ClaI, EcoRI, HindIII) analysis were found to have identical DNA fragment patterns in gel electrophoresis. The strain was identified as Lactobacillus fructivorans using morphological, physiological and biochemical characteristics, combined with the information obtained from ribotyping. Factors affecting growth and survival of this L. fructivorans strain in ketchup production were also studied. An L. fructivorans count of 105 CFU/g resulted in spoilage of inoculated ketchup samples. Spoilage occurred only in samples incubated at 15 to 30°C. The L. fructivorans implicated in causing spoilage demonstrated heat resistance with a D value of 1.2 min at 65°C. The strain did not show resistance to alkaline active chloride-containing detergent sanitizer; alkyldimethylbenzylammonium chloride and alkyldimethylethylbenzylammonium chloride-containing sanitizer were also found to be effective antimicrobial agents.

Growth, survival and activity patterns of recently metamorphosed Bufo marinus

1993 ◽  
Vol 20 (1) ◽  
pp. 1 ◽  
Author(s):  
MP Cohen ◽  
RA Alford
Keyword(s):  
Profile Analysis ◽  
Activity Patterns ◽  
Survival Rates ◽  
Larval Habitat ◽  
Bufo Marinus ◽  
Daily Maximum ◽  
Growth And Survival ◽  
Factors Affecting ◽  
The Mean ◽  
Stage 1

We examined factors affecting the growth and survival of postmetamorphic Bufo marinus using sampling and experiments. Bufo metamorphs, defined as newly emerged terrestrial toads of 9-29mm snout-ischium length (SIL), were classified into four stages on the basis of colour and size. Stage 1 were uniformly black and about 9-12 mm SIL, stage 2 were mottled with orange spots and about 12-16mm SL, stage 3 had a white mid-dorsal line and were about 16-25mm SIL, and stage 4 had enlarged parotoid glands and were about 25-29 mm SIL. We determined the density of each stage at three distances (0-1, 2-3, 4-5m) from their larval habitat using 1 x 1-m quadrat samples. The mean densities of all metamorphs within 1 m of water were 2.6m-2 and 2.1m-2 for the wet and early dry seasons, respectively. The mean densities of all metamorphs during both seasons at 2-3m and 4-5m from water were 0.8m-2 and 0.6m-2, respectively. Stage 2 metamorphs were most common in samples. Most stage 1 metamorphs occurred within 1m of the water in both seasons (98% wet; 95% dry). Increasing percentages of stage 2, 3 and 4 metamorphs occurred in samples 2-3 and 4-5m from water (38, 49 and 80%, respectively, averaged over both seasons). Three experiments examined the response of metamorph growth and survival rates to density in open-topped flyscreen enclosures. Stage 1 or 2 metamorphs were established at initial densities of 3.3, 6.7 and 16.7m-2. Metamorphs in the lower-density enclosures grew more rapidly than metamorphs in the higher-density enclosures. A profile analysis showed that daily survival rate was not densitydependent. Correlation analyses showed that daily metamorph survival was influenced by daily maximum and minimum temperatures. Metamorphs at lower densities attain juvenile size (30mm) more rapidly; because they survive at the same daily rates as metamorphs at higher densities they experience lower cumulative mortality as metamorphs.

Factors Affecting Migration Timing, Growth, and Survival of Juvenile Coho Salmon in Two Coastal Washington Watersheds

2012 ◽  
Vol 141 (4) ◽  
pp. 890-906 ◽  
Author(s):  
Philip Roni ◽  
Todd Bennett ◽  
Ranae Holland ◽  
George Pess ◽  
Karrie Hanson ◽  
...  
Keyword(s):  
Coho Salmon ◽  
Growth And Survival ◽  
Factors Affecting ◽  
Migration Timing
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