We report on a form of sperm polymorphism, termed polymegaly, that occurs in species of the Drosophila obscura group. Individual males of species in this group characteristically produce more than one discrete length of nucleated, motile sperm. Hypotheses suggested to explain the evolutionary significance of sperm polymorphism have been either nonadaptive or adaptive, with the latter focusing o...

This study was carried out to evaluate the fertility of rice soil and effect inorganic fertilizers combined with sugarcane filter cakes on yield in a protected dike area Cho Moi district, An Giang province. The experiment consists 4 treatments, dose fertilizer each treatment is (1) controlled according farmers’ dosage (224 kg N + 148 P2O5 ha−1), (2) fertilize farmers 6 tons/ha cow manure compos...

In agricultural activities, there is an increasing need for organic fertilizers to use nature-friendly materials used fertilize the soil. Farmers have been using granular made from composted or dried manure of cattle, poultry, pigs, ash, bone meal, and other some time, but quantities these are not large. Biochar also being intensively studied as a material improve soil quality plant growth redu...

Mammalian spermatozoa gain competence to fertilize an oocyte as they travel through the female reproductive tract. This process is accompanied by an elevation of sperm intracellular calcium and a membrane hyperpolarization. The latter is evoked by K(+) efflux; however, the molecular identity of the potassium channel of human spermatozoa (hKSper) is unknown. Here, we characterize hKSper, reporti...

Twentieth-century researcher Ernest John Christopher Polge studied the reproductive processes of livestock and determined a method to successfully freeze, thaw, and utilize viable [4] sperm [5] cells to produce offspring in animals. In 1949, Polge identified glycerol as a cryoprotectant, or a medium that enables cells to freeze without damaging their cellular components or functions. Several ye...

Climate change can have significant impacts on agriculture, both in terms of crop production and livestock management. Rising temperatures, changing rainfall patterns, extreme weather events such as droughts floods reduce yields. GCMs been used to predict climate scenarios many cases using the downscaling approach. Crop simulation models are crucial gaining valuable insights into intricate inte...

Fertilizer use is environmentally unsustainable in South Asia. Ideally, farmers would follow optimal fertilization rates for crops based on scientific recommendations. However, there ample evidence why under-fertilize or over-fertilize their crops. Important amongst them that farmers' attitude to risk influences decisions fertilizer use. This paper reviews studies the effects of use, timing app...

Every community has local wisdom that becomes its cultural identity. This study analyzes ”luwangan” as the Javanese for managing household waste. Information, facts, and data are revealed to understand concept of waste management in society. The uses a phenomenological approach. people, “sesepuh,” leaders were chosen research subjects, while informants experts language lecturers. Observational ...