Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Biological Sciences

Articles 331 - 341 of 341

Full-Text Articles in Entire DC Network

Cultivating The Edible Oyster Mushroom Pleurotus On Sawdust, Fss Magingo Dec 1998

Cultivating The Edible Oyster Mushroom Pleurotus On Sawdust, Fss Magingo

Tanzania Journal of Science

The edible mushroom Pleurotus pulmonarius was grown on pasteurized saw dust supplemented with either Crotalaria ochroleuca (N2- fixing legume) or with chicken manure. Inoculated, unsupplemented sawdust acted as control. Sawdust supplemented with C. ochroleuca biomass yielded the highest fresh weight of the mushroom with a biological efficiency (B.E) of 83%. Sawdust supplemented with chicken manure had a 67% B.E., while control gave the least harvest (B.E. = 32%). Reasons for the differences are discussed.

Go to article

Global Warming: A Threat To Human Societies And Natural Ecosystems, Yunus D. Mgaya Dec 1997

Global Warming: A Threat To Human Societies And Natural Ecosystems, Yunus D. Mgaya

Tanzania Journal of Science

The possible influences of increases of mean sea surface temperatures are briefly reviewed. It is virtually certain that human activities are changing the composition and behavior of the atmosphere, leading to increased concentrations of greenhouse gases. Recent analyses and model predations show that risks to human societies and natural ecosystems from enhanced greenhouse effect may be large. A rising sea level could result in quite dramatic changes in maritime boundaries (as states to act to protect their maritime zones. It is concluded that in setting management goals with respect to mitigating the effects of global warming, one needs to recognize …

Go to article

Effect Of Filter Pore Size For Liquid Effluent Removal On The Performance Of An Artificial Rumen Reactor, Amelia Kajumulo Kivaisi, Martin Barugahare Dec 1996

Effect Of Filter Pore Size For Liquid Effluent Removal On The Performance Of An Artificial Rumen Reactor, Amelia Kajumulo Kivaisi, Martin Barugahare

Tanzania Journal of Science

The effect of filter pore size on performance of an artificial rumen reactor was studied. Filter units of pore sizes in the range of 10-300 mm were used in the reactor to separate the solids from the fermentation liquid at solid and liquid retention times of 72 and 12 h, respectively. The overall performance of the reactor decrease markedly with increasing filter pore size. Total cellulose activity and substrate degradation decreased by 70 and 30% respectively, when the pre sizes changed from 10 to 300 mm. ciliate protozoa decreased in number with increasing filter pore size and were almost completely …

Go to article

Effect Of Various Control Regimeson Insect Pests And Seed Yield Of Beans, Chipungahelo G.S.E, A.K. Karel Dec 1992

Effect Of Various Control Regimeson Insect Pests And Seed Yield Of Beans, Chipungahelo G.S.E, A.K. Karel

Tanzania Journal of Science

The effect of various control regimes on insect pests and seed yield was studied in common (Phaseolis vulgaris L.) beans. Two varieties namely Selian Wonder and Canadian Wonder were used. Four treatments of insecticide were used namely, full control (control throughout the growing seasons), control before flowering, after flowering, and no insecticide application. Endosulfan 35EC was sprayed at the rate of 800 g A.l. per 500 l of water per application. In this study both pre-flowering and post flowering pests were important. They included Ootheca bennigseni, Maruca testulalis, Heliothis armigera and Anoplocnemis curvepes. In addition a number of less …

Go to article

Influence Of Previous Liming, N And P Fertilization Of An Oxisol On Grain Yield In Navy Beans, H. O. Mongi, A. P. Uriyo Jul 1975

Influence Of Previous Liming, N And P Fertilization Of An Oxisol On Grain Yield In Navy Beans, H. O. Mongi, A. P. Uriyo

Tanzania Journal of Science

A field study was initiated towards the end of the 1973 rain season to assess some residual effects of lime, N and P applications to a moderately acid Oxisol (initial pH 5.6; LR 10 tons/ha) on grain yield in navy beans, Phaseolus vulgaris L., grown soon following maize silage. The Oxisol was a sandy clay loam (35:13:52). The design was a split-plot, confounded factorial with 4 levels of lime at 0, 7.5, 10.0 and 12.5 tons agricultural lime/ha; N at 0, 100, 200 and 300 kg N/ha as ammonium sulphate; and P at 0, 40, 80 and 120 kg P/ha …

Go to article

Incorporation Trends Of (I-C14) Acetate In Pregnancy Lipids Of Various Organs, D.P. Sharma, T. A. Venkitasubramanian Jul 1975

Incorporation Trends Of (I-C14) Acetate In Pregnancy Lipids Of Various Organs, D.P. Sharma, T. A. Venkitasubramanian

Tanzania Journal of Science

Comparative evaluation of (I-C14) acetate incorporation was studied in ovary, adrenal, blood plasma and placenta in guinea pigs in mid pregnancy. The respective level of incorporation within the sample for total lipids did not differ in pregnancy and non-pregnant states. Placental lipids in general, and phospholipids in particular were highly incorporated in contrast to other organs/tissues. Amongst non-pregnancy total lipids, the blood plasma showed an elevated incorporation over ovarian and adrenal lipids. The ovary in pregnancy revealed depressed incorporation in general, except for esterified cholesterol which contained higher incorporation.  Phosphatidyl choline in adrenal, and phosphatidyl ethanolamine in blood plasma appeared …

Go to article

Chromosome Numbers Of Angiosperms In Tanzania, L.S. Gill, F.L. S Jul 1975

Chromosome Numbers Of Angiosperms In Tanzania, L.S. Gill, F.L. S

Tanzania Journal of Science

Chromosome Numbers of 30 taxa of angiosperms from Tanzania are reported. Of these, counts of 8 species are new. The occurrence of B-chromosome in Ornithogalum longibracteatum is reported for the first time.

Go to article

Contributions To The Knowledge Of The Mydis (Crustacea) From The Tanzanian Waters, Mihai Bacescu Jul 1975

Contributions To The Knowledge Of The Mydis (Crustacea) From The Tanzanian Waters, Mihai Bacescu

Tanzania Journal of Science

This is the first study on Mysids from the Tanzanian coast waters, in which, on the basis of material captured by himself, the author deals with some species belonging to the subfamily of Gastrosaccidae and Mysinae. Of the about 20 species identified so far in the collected material, five are new, namely: Gastrosaccus  msangii n.sp.; Anisomysis kunduchiana n.sp.; Tenagomysis tanzaniana n.sp.; Anisomysis sirielloides n.sp. and Mysidopsis coralicola n.sp. and six others are new to the area. Ecological and ethological data concerning all species mentioned are given.

Go to article

Trials With Trickle Irrigation Equipment At Morogoro Preliminary Report, M.E. Parkes, M. E. Madata Jul 1975

Trials With Trickle Irrigation Equipment At Morogoro Preliminary Report, M.E. Parkes, M. E. Madata

Tanzania Journal of Science

The use of trickle irrigation is discussed with reference to Tanzania. A split-split plot design experiment is described in which yields of tomato, onion, and cabbage are compared for trickle and hand-irrigated plots, with different levels of fertiliser treatment. Yields for trickle-irrigated plots were significantly greater only for tomatoes. These results were achieved during July to October and a second attempt to grow the same vegetables during December to March was unsuccessful. Further trials are required to obtain a suitable rotation of vegetable crops from both a nutritional and agronomic point of view. Experience with the trickle irrigation equipment is …

Go to article

The Surveillance Of Rodent Populations In East Africa In Relation To Plague Endemicity, S. Msangi Jan 1975

The Surveillance Of Rodent Populations In East Africa In Relation To Plague Endemicity, S. Msangi

Tanzania Journal of Science

Plague has been endemic in East Africa from very early times. The fact that the plague organism occurring in the area is mostly Pasteurella pestis var. antiqua which is said to have been associated with the Justinian pandemic of the 6th century A. D. would seem to support the contention that this endemicity was established during that pandemic. The maintenance of this endemicity has been made possible by the presence in the area of suitable rodent reservoirs, efficient flea vectors and favourable climatic and ecological conditions. The main reservoirs of plague in East Africa are Rattus rattus, Praomys natalensis and …

Go to article

The Kunduchi Mangrove Basin, Alison Mccusker Jan 1975

The Kunduchi Mangrove Basin, Alison Mccusker

Tanzania Journal of Science

The pattern of tidal submergence and exposure in the Kunduchi mangrove basin is determined by contour mapping and by relating the contours to published tide predictions. Salinity of the creek effluent is measured at spring and neap tides in both wet and dry seasons. The vegetation of the basin, up to the highest high water level, is described briefly.

Go to article

First Prev