• Ocean and Polar Research
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• 제23권4호
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• pp.379-388
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• 2001

Ch1 a abundance, Ch1 a-specific productivity and phytoplankton growth rate in each size fraction (pico, $<2{\mu}m$; nano, $2-10{\mu}m$; micro, > $10{\mu}m$) in the waters around the South Shetland Islands (Ant-arctic Peninsula Area) were analysed. Although Ch1 a-specific productivity and growth rate were highest in micro-size fractions, ChI a abundance was highest in pico-size fractions. Selective removal of nano- and micro-size phytoplankton especially by krill and salp grazing, but not limitation of phytoplankton growth, seemed to be the major reason to explain this miss match between productivity and abundance of the phytoplankton community.

• Asian-Australasian Journal of Animal Sciences
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• 제13권3호
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• pp.323-328
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• 2000

The administration of soluble glass bolus (SGB) with cobalt (Co), selenium (Se) and copper (Cu), among 50 upgraded does in the farm of Central Luzon State University, Philippines, was effective in improving the mineral status of the animals. After one year, blood Se and plasma Cu had been significantly increased; subsequently plasma molybdenum (Mo) level had been reduced, but other macro-minerals were not affected. Soluble glass bolus supplementation did not affect plasma calcium (Ca), magnesium (Mg), and sodium (Na), although the treated does had higher plasma phosphorus (P), potassium (K), and zinc (Zn) in some parts of the year. Hematocrit count of the animals was also improved reaching 32% level after 9 months; although it was still 6% below the lower limit of a normal range of 38 to 45%. The desired improvement in Se, Cu and Mo was not able to influence live weight among the animals. After one year, body weight was not significantly different from the control group of animals. Nevertheless, the study showed the effectiveness of SGB in improving Cu and Se levels, and subsequently reducing the plasma Mo levels of grazing goats in a typical Philippine farm.

• 미생물학회지
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• 제30권2호
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• pp.129-133
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• 1992

소양호에서 여름에 출현하는 동물 플랑크톤의 포식 작용을 형광 현미경으로 관찰하였다. 형광 bead 와 형광 염색한 세균을 bacterivore 로 보았으며 장내에서 엽록소의 autofluorescence 가 발견되는 것은 algavore 로 보았다. Copepoda 의 유츙과, Thermocyclops, Pleosoma 등은 algavore 였으며, Daphnia, Bosmina, Keratella, Hexathra 등은 bacteriovore 였다. 개체수로는 65.7% 가 algavore 였으며, 34.4% 가 bacteriovore 였다. Bacteriovore 인 동물 플랑크톤은 직경이 0.5 $\mu$m 이상인 입자를 선호하였으며, 형광 bead 와 형광 엽색 세균은 섭취율에 큰차이가 없었다.

• The Korean Journal of Ecology
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• 제23권2호
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• pp.135-140
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• 2000

The Government of Mongolia approved establishment of the Mongolian LTER network in December 1997. In June 1998, a seminar was organized by the Mongolian Academy of Sciences to initiate the program. Dr. James Gosz of the US LTER program keynoted the seminar. A Mongolian LTER Steering Committee was established to organize the network and to develop guidelines for its management. This Committee designated Hovsgol National Park in northern Mongolia as the first Mongolian LTER network site. Other potential sites are presently being considered. including study sites in steppe grassland and desert locations. The primary goals of the Mongolian LTER Network are to study human impacts on Mongolia's environment; with a focus on short-term impacts of nomadic grazing on terrestrial and aquatic ecosystems and long-term climate change impacts on more pristine environments in the protected areas. There are at least two additional goals: to provide information and advice on how best to protect Mongolia's pristine environments, and to train Mongolian students to work on environmental problems to encourage the growth of expertise for making sound environmental decisions.

• Asian-Australasian Journal of Animal Sciences
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• 제15권5호
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• pp.643-649
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• 2002

Availability of feeds and fodder and amount of their intake by large ruminants in eight different agro-ecological zones (AEZ) of Bangladesh were recorded over a year. Roughages such as straw, naturally grown green grass, water hyacinth, tree leaves, legumes and sugarcane tops were the major feedstuffs fed to the large ruminants. Amount of intake of these ingredients differed (p<0.01) across AEZ studied, but did not differ across seasons or farmers' categories (p>0.05) except for green grasses (p<0.01). Byproduct concentrates offered to animals in the studied areas were rice bran, wheat bran and different oil cakes. The amount of intake of concentrates by the animals also differed (p<0.01) across AEZs, but did not differ across seasons or farmers' categories (p>0.05), except for rice bran and wheat bran which differed between season and farm category, and season respectively (p<0.01). The large standard errors of mean indicate that there are wide variations in intake of roughages and concentrates across AEZ's, seasons and farmers' categories and even across days. This further indicates that the feeding practices of large ruminants are largely heterogeneous. In addition to feeding roughage and concentrates, the animals were allowed to graze for six hours a day. Grazing hours also differed (p<0.01) across AEZ, but not by farmers' categories or seasons.

• Animal cells and systems
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• 제6권4호
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• pp.293-299
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• 2002

We investigated seasonal variation of diurnal activity patterns in Jeiu ponies (Equus caballus). The data were collected from a semi-natural herd during daylight hours from March to September 1998. Over all months the mean proportion of time spent grazing was 83.7% ( $\pm$29.7 S.D.): that resting was 15.7$\pm$17%, grooming 0.7$\pm$1.2%, and moving 0.56$\pm$5.4%, Activity patterns varied with the seasons. The mean proportion of grazing mares peaked during late winter and early spring (March), when there was not enough food, and declined during other seasons (between May and September), when food was abundant. The mean proportion of mares that were resting and mutual grooming peaked in spring (April and May), at which time the weather was warm and food became abundant. During other seasons when grasses started to grow and the weather was mildly cool, these activities were less common. The mean proportion of mares that were moving peaked in June, although it was a small proportion of the total activity. For those mares without foals, resting periods were longer in older mares than in younger mares, but for the mares with foals this pattern was not evident. From these data, we hypothesize that the dominance hierarchy of the mares effects the diurnal activity pattern.

• Current Optics and Photonics
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• 제6권1호
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• pp.44-50
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• 2022

An off-axis zone plate is able to focus on a single order while neglecting the zeroth order in a visible imaging system. This allows one to enhance the contrast quality in diffractive images, which is the major advantage of this type of zone plate. However, most previous reflection zone plates are used in focusing X-rays with a small grazing incident angle and are intricately designed with the use of a local grating period. In this study, we suggest the design of an off-axis elliptical zone plate (EZP) that is used to focus a monochromatic light beam with separation between the first and unfocused orders under a large grazing incident angle of 45°. An assumption using the total grating period, which depends on the average and constant grating period, is proposed to calculate the desired distance between the first and zeroth order and to simplify the construction of a novel model off-center EZP. Four diffractive optical elements (DOEs) with different parameters were subsequently fabricated by direct laser lithography and then verified using a performance evaluation system to compare the results from the assumption with the experimental results.

• 한국동물학회:학술대회논문집
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• 한국동물학회 1995년도 한국생물과학협회 학술발표대회
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• pp.196.1-196
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• 1995

No Abstract, See Full Text

• 한국농림기상학회:학술대회논문집
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• 한국농림기상학회 2019년도 하계 학술발표초록집
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• pp.161-162
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• 2019

• 한국환경생물학회:학술대회논문집
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• 한국환경생물학회 2001년도 학술대회
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• pp.130-130
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• 2001