There are two broad mechanisms by which plant populations persist under recurrent disturbances: resprouting from surviving tissues, and seedling recruitment. Species can have one of these mechanisms or both. However, a coherent framework explaining the differential evolutionary pressures driving these regeneration mechanisms is lacking. We propose a bottom-up approach in addressing this questio...

In order to further improve the seeding performance of maize seed-metering device, a pressure-holding precision device for was designed. The is made up several seed rowing modules, which effectively solves problems inconvenient disassembly and complex maintenance current device. working principle introduced, mechanical kinematic analysis seeds during operation carried out. orthogonal test out w...

"Air-seeding" is a proposed mechanism for the initiation of water stress embolism in dead plant cells. During air-seeding, external air is drawn into the lumen of a dead plant cell through a pore or crack in the cell wall. The resulting bubble may expand to fill the lumen, thus embolizing the cell. The data presented confirm that Sphagnum hyalocysts can embolize by air-seeding when the pressure...

Green onion (Allium fistulosum L.) is mainly available as factory-produced seedlings. Although factory seedling production highly automated, miss-seeding during the seeding process considerably affects subsequent transplanting and final yield. To solve problem of miss-seeding, current main method manual complementary seeding, which labor-intensive inefficient work. In this study, an automatic m...

Skeletal muscle metastases following cancer surgery are rare. Few cases of abdominal wall metastasis have been reported in the literature and attributed to tumor seeding after laparoscopic surgery or percutaneous nephrostomy. We report a case of abdominal tumor seeding after open nephroureterectomy managed by means of a surgical and medical approach.

This is a case report on irritant contact dermatitis secondary to calcium oxide exposure during manual cloud seeding operations. A less hazardous substitute such as sodium chloride should be considered wherever possible. Cloud seeding operations are briefly discussed in this report, and the impact of calcium oxide exposure as an occupational hazard is elaborated.

the cyclical changes in the gonadotropins stimulate ovarian follicular development either to the ovulatory stage or to undergo atresia. one such intrafollicular factor may be inter-cellular communication via gap junctions. we have examined the effects of two agents (retinoids and alkanols), known to disrupt or uncouple gap junction, on fsh-stimulated lh receptor induction and progestrone synthe...

In Experiment 1, five adult female impala were fitted with harnesses that restrained oral self-grooming of the anterior part of the body. At the same time, six cohoused female impala were fitted with control harnesses that allowed normal oral grooming. The impala were allowed to habituate to the harnesses for 10 days, and both groups were then exposed to larval ticks (Boophilus decoloratus) by ...