OALib Journal期刊

ISSN: 2333-9721




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匹配條件: “B.A. Wenhold” ,找到相關結果約554474條。
Reproduction in the yellow mongoose revisited
O.A.E. Rasa,B.A. Wenhold,P. Howard,A. Marais
African Zoology , 2012,
Abstract: ENGLISH ABSTRACT: Previous reports on female reproduction in yellow mongooses, based on anatomical examination of specimens, concluded that this species is monoestral but with an extended breeding period. Our long-term studies on known females provide clear evidence of the production of two litters annually within a period of 2-4 months, females initiating a new oestrus cycle while still lactating. We present a biological explanation for the adaptive significance of polyoestry in this species based on a unique mode of infant nutrition for viverrids. ******* AFRIKAANSE OPSOMMING: Anatomiese ondersoeke van volwasse vroulike geelmuishonde het aangetoon dat dit 'n mono-estrusspesie is met 'n verlengde teelperiode. Ons langtermynstudie van bekende wyfies toon dat daar jaarliks twee werpsels binne 'n periode van 2-4 maande geproduseer word waar die wyfies 'n tweede estrussiklus tydens laktasie ondervind. 'n Biologiese verklaring vir hierdie verskynsel is gebaseer op die wyse waarop die kleintjies in die spesie gevoed word. Die manier van voeding is uniek aan die Viverridae
B.A Onile
African Journal of Clinical and Experimental Microbiology , 2002,
Abstract: The sexually Transmitted Diseases constitute major public health problems in Nigeria. There is early sexual maturity and considerable sexual activity between 9 and 15 years of age. Although there is a high awareness of the condom, people are unwilling to use them despite evidence of multiple sexual exposures. The STDs, including HIV infections, are on the increase. Tuberculosis is also on the increase because of a HIV/AIDS epidemic. Both categorical and integrated approach to the management of STDs and AIDS are being recommended. There is a need to step up basic research into the biology of HIV and subsidize the treatment of AIDS. Efforts at vaccine development should be initiated to stem the worsening HIV epidemic. (Af. J. of Clinical and Experimental Microbiology: 2002 3(2): 78-81)
Chemical Composition of Musa sapientum (Banana) Peels
B.A. Anhwange
Journal of Food Technology , 2013,
Abstract: Musa sapientum peels were analysed for minerals, nutritional and anti-nutritional contents. The result of mineral content indicate the concentrations (mg g 1) of potassium, calcium, sodium, iron, manganese, bromine, rubium, strontium, zirconium and niobium to be 78.10, 19.20, 24.30, 0.61, 76.20, 0.04, 0.21, 0.03, 0.02 and 0.02, respectively. The percentage concentrations of protein, crude lipid, carbohydrate and crude fibre were 0.90, 1.70, 59.00 and 31.70, respectively. The results indicate that if the peels are properly exploited and process, they could be a high-quality and cheap source of carbohydrates and minerals for livestock.
The fish community of the Berg River estuary and an assessment of the likely effects of reduced freshwater inflows
B.A. Bennett
African Zoology , 2012,
Abstract: ENGLISH ABSTRACT: Data concerning the species composition, abundance and distribution of fishes in habiting the Berg River estuary are presented and used to assess the value of the estuary to fish, and the likely effects of reduced freshwater in flows. A total of 31 species was recorded, eight of which were classified as estuarine residents, 11 as marine estuarine-opportunist, six as marine stragglers and six were freshwater species. Liza richardsonii, an opportunist, was the most abundant (54% N) and widely distributed species encountered during the winter and summer seine-net surveys. Three other species (all residents) contributed more than 10% of the total catch; Atherina breviceps and Caffrogobius nudiceps occurring most abundantly in the lower estuary, and Gilchristella estuaria in the middle estuary. The low number of species compared with estuaries in other regions of the South African coast reflect a well-established marine biogeographical trend. The higher proportions of resident species, entirely dependent species and partially dependent species suggest, however, that west coast estuaries may be more important to the fish that inhabit them than are estuaries in other regions. It is concluded that the fish community of the estuary is already suffering the effects of habitat degradation and that further reducation in freshwater inflows are not desirable. ******** AFRIKAANSE OPSOMMING: Data betreffende die spesiessamestelling, talrykheid en verspreiding van visse wat die Bergriviermond bewoon, word aangebied en gebruik in 'n raming van die waarde van die mond vir die bewonende visse, en die moontlike gevolge van verminderde varswaterinvloei. 'n Totaal van 31 spesies is aangeteken, agt waarvan geklassiliseer is as mondinwoners, 11 as mariene trekvisse, ses as mariene swerwers en ses as varswateisoorte. Liza richardsonii, 'n trekvis, was die volopste (54%N ) en mees wydverspreide spesies wat te gekom is gedurende die winter- en someropnames. Die ander spesies (almal inwoners) het meer as 10% bygedra tot die totale vangs, met Atherina breviceps en Caffrogobius nudiceps wat volopste in die laer-, en Gilchristella estuaria in die middelgedeeltes van die strandmeer, voorkom. Die klein aantal spesies weerspie l 'n goed vasgelegde mariene biogeografiese neiging. Die groter proporsie van inwonerspesies, total afhanklike en gedeeltelik afhanklike spesies suggereer egter dat Weskusriviermonde belangrikerr mag wees vir die visse wat hulle bewoon as riviermonde in ander streke. Die gevolgtrekking word gemaak dat die visgemeenskap van die riviermonde reeds on
The Effects of Cooking Time on the Nutritional Parameters of Soya Milk
B.A. Orhevba
American Journal of Food Technology , 2011,
Abstract: In this study, the effect of cooking time on the nutritional quality of soya milk was determined with a view of obtaining the approximate time at which soya milk should be cooked to have its optimum benefit for man. Standard laboratory conditions, methods and instruments were used to obtain the results of the experiments. The soya milk samples were cooked for 15, 30 and 45 min, respectively and there were significant differences in the nutritional composition of soya milk cooked between these time intervals. Soya milk cooked for 15 min was characterized by a moisture content of about 93.45%; ash 4.17%; protein 3.72%; lipids 12.0%; carbohydrates 80.11% and energy value of 443.32 kcal/100 g. On the other hand, the soya milk prepared for 30 min contained moisture content level of 92.29%; lipids 6.48%; energy value of 409.08%, ash 5.83%, crude protein 4.23% and carbohydrates 83.46%. The sample of soya milk prepared for 45 min was characterized by ash content of 6.0%, crude protein 4.74% and lower moisture content 90.36%, lipids 6.17%, carbohydrates 83.09% and energy value of 406.00 kcal/100 g. The minerals investigated gave the following results under treated time of 15, 30 and 45 min, respectively; sodium: 27, 23 and 27 mg/100 mL, potassium: 41, 60 and 62 mg/100 mL, magnesium: 32.2, 31 and 35 ppm and calcium: 109.5, 81 and 90.0 ppm, respectively. It was evident that there were varying degrees of changes that occurred in each of the chemical composition of the soya milk with respect to the different periods of cooking.
Underwater Telemetry as a Tool in Aquaculture Research and Development
B.A. Holand
Modeling, Identification and Control , 1987, DOI: 10.4173/mic.1987.1.2
Abstract: Small acoustical transmitters may be used to obtain data from free swimming fish. The main principles behind this technique are described together with some of the equipment developed. Some examples are briefly discussed where heart beats, depth and temperature are measured to describe fish behaviour. Automatic fish tracking equipment that has been used to track fish within an enclosed area is also described.
Trends in the control of heartwater : tick-borne diseases
B.A. Allsopp
Onderstepoort Journal of Veterinary Research , 2010, DOI: 10.4102/ojvr.v76i1.69
Abstract: Heartwater is an economically serious tick-borne disease of ruminants caused by the intracellular bacterium Ehrlichia ruminantium. The disease has traditionally been controlled by four different approaches : controlling the tick vector by dipping, establishing endemic stability, performing immunisation by infection and treatment, and preventing the disease by regular administration of prophylactic antibiotics. The first three of these methods are subject to failure for various epidemiological reasons, and serious disease outbreaks can occur. Prophylaxis is effective, but very expensive, and the logistics are daunting when large herds of animals are involved. The development of a safe, cheap and effective vaccine is the only likely way in which heartwater can be economically controlled, and over the past 15 years three new types of experimental vaccine have been developed: inactivated, attenuated, and recombinant vaccines. These new vaccines have shown varying degrees of promise, but none is as yet sufficiently successful to be marketable. We describe the experimental products, and the various technical and biological difficulties which are being encountered, and report on ways in which new technologies are being used to improve vaccine effectiveness.
How age affects auditory-cognitive interactions in speech comprehension
B.A. Schneider
Audiology Research , 2011, DOI: 10.4081/audiores.2011.e10
Abstract: To participate effectively in multi-talker conversations, listeners need to do more than simply recognize and repeat speech. They have to keep track of who said what, extract the meaning of each utterance, store it in memory for future use, integrate the incoming information with what each conversational participant has said in the past, and draw on the listener’s own knowledge of the topic under consideration to extract general themes and formulate responses. In other words, to acquire and use the information contained in spoken language requires the smooth and rapid functioning of an integrated system of perceptual and cognitive processes. Here we review evidence indicating that the operation of this integrated system of perceptual and cognitive processes is more easily disrupted in older than in younger adults, especially when there are competing sounds in the auditory scene.
The state of the Railways in South Africa during the Anglo-Boer War 1899-1902
B.A. Zurnamer
Scientia Militaria : South African Journal of Military Studies , 2012, DOI: 10.5787/16-4-466
Abstract: The railways in South Africa were badly damaged during the Anglo-Boer War by the armed forces of the two Republics during their retreat and the guerilla campaign which followed.
A Generalization of Cartesian Product of Fuzzy Subgroups and Ideals
B.A. Ersoy
Journal of Applied Sciences , 2003,
Abstract: In this paper we generalize Malik and Mordeson’s paper (1991). I analysis the Cartesian product of fuzzy subgroups (ideals ) of different groups (different ideals). That is ; if μ and σ are fuzzy subgroups (ideals) of G1 and G2 (R1 and R2 ) respectively then μ x σ is a fuzzy subgroup (ideal) of G1 x G2 ( ). Conversely the opposite direction of the above statements is studied. We generalize above statements for different Groups (Rings).

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