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Digitale Medien

Insectivory and its significance to langur diets (1991)

Srivastava, A.

Springer

Primates 32 (1991), S. 237-241

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ISSN: 0032-8332

Schlagwort(e): Insectivory ; Diet ; Presbytis entellus ; Energy/nutrient maximization

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Earlier studies on Hanuman langurs (Presbytis entellus) around Jodhpur found them entirely vegetarian (Mohnot, 1974;Winkler, 1988). However, recent observations in the open scrub forests of Jodhpur reveal that scale insects may constitute a regular part of their diet and that insectivory is particularly prevalent in the monsoon months July – September. The insect eating in this habitat seems to support the “Energy/nutrient maximization” hypothesis ofHamilton andBusse (1978).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02381181

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Digitale Medien

Abortions in free ranging Hanuman langurs (Presbytis entellus) — a male induced strategy? (1988)

Agoramoorthy, G. ; Mohnot, S. M. ; Sommer, V. ; [weitere]

Springer

Human evolution 3 (1988), S. 297-308

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ISSN: 1824-310X

Schlagwort(e): Presbytis entellus ; Reproductive strategies ; Abortion ; Infanticide

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract During a 10-year long term study, 6 eye-witnessed and 1 pressumed cases of abortions occurred in 3 one-male bisexual troops of free ranging langurs (Presbytis entellus) near Jodhpur, Rajasthan, India. The age of the unborns varied from 35 to about 200 days. The subsequent birth interval ranged between 7.1–21.1 months. 2 miscarriages occurred during stable periods of residency of a single male. 5 cases occurred prior to or after infanticide in connection with male changes. In one case a female was attacked by the new male before she aborted. In one case a female presumably aborted after attacks on her semiweaned infant. Most of the reproductive losses hence seem to be related to psychical and physical stress exerted by new males on pregnant females. As part of their reproductive strategy, males reduce their waiting time to insemination in this way. Abortions may likewise represent an adaptive reproductive strategy of females, who prefer to abort instead of investing in a foetus which is likely to be killed after birth.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02435859

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Digitale Medien

Measurement and regulation of the culture reduction state in Clostridium acetobutylicum (1991)

Srivastava, A. K. ; Volesky, B.

New York, NY [u.a.] : Wiley-Blackwell

Biotechnology and Bioengineering 38 (1991), S. 181-190

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ISSN: 0006-3592

Schlagwort(e): solventogenic metabolism ; NADH content ; NADH fluorescence ; continuous fermentation ; butanol biosynthesis ; Chemistry ; Biochemistry and Biotechnology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: With a constant glucose feed concentration, the change in the continuous culture dillution rate resulted in an altered fermentation profile and the cellular NADH content. The cultures growing at high dillution rates demonstrated an oxidative metabolism low NADH and butanol concentrations. The low specific NADH flourescence (F/X) at high butanol production rates suggested that a rapid regeneration of NADH to NAD is essential for a high solventogenic culture activity. The culture florescence and butanol concentration remained constant in the solventogenic dilution rate range of D = 0.05-0.2 h-1 with an inverse relationship between the specific flourescence (F/X) and the specific butanol production rate, qB. Flourometric NADH observations were confirmed by enzymatic NADH determination. The stiochiometric “Fermentation Equation” was used to check the experimental data consistency and to investigate the role of the available biosynthetic and reduction energy on the culture metabolic activities under different growth conditions. The butanol concentration in the broth was stabilized in a fed-batch process when the culture NADH fluorescence was being controlled through the addition of fresh medium.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/bit.260380210

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Digitale Medien

NADH fluorscence in a carbon-limited fermentation (1991)

Srivastava, A. K. ; Volesky, B.

New York, NY [u.a.] : Wiley-Blackwell

Biotechnology and Bioengineering 38 (1991), S. 191-195

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ISSN: 0006-3592

Schlagwort(e): continuous flow acetone-butanol fermentations ; reduction energy ; solvent production activity ; inlet sugar concentrations ; Chemistry ; Biochemistry and Biotechnology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: The continuous flow acetone-butanol fermentation conducted at lowered inlet feed sugar concentrations and at a constant dilution rate D =0.075 h-1 demonstrated a significant decreases in the availability of the cell population “reduction energy” (F/X), resulting in an exclusive accumulation of intermediate acids under those conditions. The cultures resumed its solvent production activity when the inlet sugar concentration in the feed stream was increased from 20 to 40 g/L at the same low growth/dilution rates. A linear correlation between the culture reduction content (F/X) and the specific butanol rate (qB) was observed under the present conditions, indicating the necessity of the NADH availability for the increased solvent production.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/bit.260380211

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Digitale Medien

Representation of culture transition states in A. suboxydans (1998)

Srivastava, A. K. ; Giridhar, R.

Chichester : Wiley-Blackwell

Journal of Chemical Technology AND Biotechnology 73 (1998), S. 23-30

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ISSN: 0268-2575

Schlagwort(e): vitamin C ; structured mathematical model ; continuous culture kinetics ; sorbose ; sorbitol ; Chemistry ; Biochemistry and Biotechnology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: The kinetics of the biotransformation of D-sorbitol to L-sorbose by Acetobacter suboxydans (NRRL B-72) features both substrate and product inhibition. Model-based reactor operating strategies can eliminate the inhibitions and improve the yield and productivity of the fermentation. Unstructured models are usually unable to acknowledge complex intracellular physiological changes and therefore their application to dynamic growth conditions is limited. By considering RNA as a bottleneck growth limiting compound a structured mathematical model was developed to describe the transient growth of Acetobacter suboxydans. The model parameters were determined by a non-linear regression technique which minimized the deviation between the model prediction and the experimental (extracellular and intracellular) continuous culture data. The model was used to simulate the transient culture behaviour during the step-down in the dilution rates (from 0·1 h-1 to 0·05 h-1) in the continuous culture experiments. The experimental results and the model simulation results showed reasonable agreement. © 1998 Society of Chemical Industry

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

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